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Computing & IT >> Telecom Abbreviations

Look through 4999 acronyms and abbreviations related to Telecom:

• XFMR — Transformer
• IPB — Invision Power Board
• LAN — Local Area Network
• URL — Universal Resource Locator
• DDRS — Dynamic Data Rate Selection
• EBITDA — Earnings before Interest, Taxes, Depreciation and Amortization
• EDD — Earliest Due Date
• ETA — Estimated Time of Arrival
• YTD — Year To Date
• YMMV — Your Mileage May Vary
• OIC — Oh I See
• GFSK — Gaussian Frequency Shift Keying
• CBCU — Centralized Broadband Control Unit
• XML — Extensible Markup Language
• BBS — Bulletin Board Service
• DND — Do Not Disturb
• CSMA/CA — Carrier Sense Multiple Access/Collision Avoidance
• DCE — Data Circuit-terminating Equipment
• ASAP — As Soon As Possible (pronounced AY-sap)
• OEM — Original Equipment Manufacturer (usually in reference to car parts)
• ECG — Electrocardiogram
• THX — Thanks
• NMSE — Normalized Mean Square Error
• ANSI — American National Standards Institute, Inc.
• ROM — Read-Only Memory
• FTP — File Transfer Protocol
• APR — Annual Percentage Rate
• BTW — By The Way
• PPM — parts per million
• ARP — Address Resolution Protocol (ATM)
• C4I — Command, Control, Communications, Computers, & Intelligence
• LASER — Light Amplification By Stimulated Emission Of Radiation (cf. Maser)
• IT — Information Technology
• DWDM — Dense Wavelength Division Multiplexing
• CSR — Customer Service Representative
• LRU — Line Replaceable Unit
• YGWYPF — You Get What You Pay For
• C3I — Command, Control, Communications & Intelligence
• UK — United Kingdom of Great Britain and Northern Ireland
• NB — Nota Bene. Abbreviation of the Latin expression commonly used to emphasise the importance of a statement, literally meaning 'observe well'. Or less politely and more amusingly, No Bullshit.
• CU — See You
• POC — Point Of Contact
• EPA — Environmental Protection Agency (US)
• BRDF — Bidirectional Reflectance Distribution Function
• IQ — Intelligence Quotient
• COB — close of business (End of duty day)
• CPU — Central Processing Unit
• CCTV — Closed-circuit television
• ATM — Automatic Teller Machine
• IP — Internet Protocol

• IRC — Internet Relay Chat
• FIFO — First In, First Out
• PDF — Portable Document Format (created by Adobe Acrobat)
• CT — Computed Tomography
• ISO — In Search Of
• RQMT — Requirement
• CR — Carriage Return
• AC — Alternating Current
• DOE — Distributed Object Environment
• MAN — Metropolitan Area Network
• QC — Quality Control
• GUI — Graphical User Interface (goo-ey)
• CSMA/CD — Carrier Sense Multiple Access with Collision Detection
• ISO — International Organization for Standardization
• BPM — Beats Per Minute
• X-BAR — Crossbar telephone exchange
• SYN — Synchronous
• P&L — Profit and Loss statement
• API — Application Programming Interface
• R&D — Research & Development
• MOU — Memorandum of Understanding (an MOU between Food & Drug Administratin and a regulatory agency in another country allows mutual recognition of inspections)
• FAQ — Frequently Asked Questions (sometimes Pronounced Fak)
• IAMAI — Internet and Mobile Association of India
• LED — Light-Emitting Diode
• CRT — Cathode Ray Tube (type of TV)
• RFP — Request For Proposal
• PDT — Pacific Daylight Time
• RTN — Regional Telecommunication Network
• ISP — Internet Service Provider
• MTBF — Mean Time Before Failure
• ISAR — Inverse Synthetic-Aperture Radar
• ASCII — American National Standard Code for Information Interchange
• CY — Calendar Year
• RDF — Resource Description Framework
• FEMA — Federal Emergency Management Agency
• SD — Standard Deviation
• TQM — Total Quality Management
• RF — Radio Frequency
• LLC — Limited Liability Company
• EDI — Electronic Data Interchange
• BTU — British Thermal Unit
• S X S — Step-by-Step
• F2F — Face To Face (also Meeting In Person)
• AFAIK — As Far As I Know
• TEMIP — Telecommunications Management Information Platform
• BRB — Be right back
• WACN ID — Wide Area Communications Network IDentifier
• UR — Your
• LCD — Liquid Crystal Display
• PO — Purchase Order

• ASTM — American Society for Testing and Materials (Philadelphia, Pennsylvania)
• CEO — Chief Executive Officer
• RPM — Revolutions Per Minute, (Rotations Per Minute)
• RAEX — Roaming Agreement EXchange
• O&M — Operation and Maintenance
• XA-FR — Exchange Access Frame Relay
• AMD — Advanced Micro Devices, Inc. (producer of computer chips)
• ATTN — Attention
• CPE — Customer Premises Equipment
• X-OFF — Transmitter Off
• NPV — Net Present Value {economics}
• MRI — Magnetic Resonance Imaging
• WBS — Work Breakdown Structure
• QFSK — Quadrature Frequency Shift Keying
• EST — Eastern Standard Time
• WTG — Way To Go
• OC-256 — Optical Carrier Signal, Level 256
• GSM — Global System for Mobile Communications
• SME — Subject Matter Expert
• PDR — Preliminary Design Review
• ATM — Asynchronous Transfer Mode
• EAP — Employee Assistance Program
• CCB — Change Control Board
• TBD — To Be Determined
• DOA — dead on arrival
• CDR — Critical Design Review
• S-BCCH — Short Message Service Broadcast Control Channel
• WB — Welcome Back
• E-LEAD — Ear Lead
• VIP — Very Important Person
• GIS — Geographic Information System
• IRR — Internal Rate of Return
• FDIC — Federal Deposit Insurance Corporation
• EU — European Union (1994; formerly referred to as the EEC or EC)
• A-KEY — Authentication key
• VPN — Virtual Private Network (ATM)
• B-ICI — Broadband Inter-Carrier Interface
• FET — Field Effect Transistor
• SMTP — Simple Mail Transfer Protocol
• ABC — activity based costing
• C-NBAP — Common Node B Application Part
• X-ON — Transmitter On
• AUP — Acceptable Use Policy
• ZDBOP — Ziff-Davis Benchmark Operation
• UAX 14 — Unit Automatic eXchange type 14
• HTTP — Hypertext Transfer Protocol
• ASME — American Society of Mechanical Engineers
• IPO — Initial Public Offering
• ARPA — Advanced Research Projects Agency (made early internet)
• GPS — Global Positioning System (ex-NAVSTAR)

• DOD — United States Department of Defense
• ADSL — Asymmetric Digital Subscriber Line
• SOW — Statement Of Work
• WWW — World Wide Web
• QA — Center for Quality Assurance in International Education
• ACK — Acknowledge (telecommunications; Cf. NAK)
• DAHDI — Digium/Asterisk Hardware Device Interface
• SRAM — Static Random Access Memory (ess-ram)
• VAT — Value Added Tax
• CV — Curriculum Vitae
• OC-18 — Optical Carrier Signal, Level 18
• ACH — Automated Clearing House
• JIT — Just in time
• PVT — Private
• IRL — In Real Life
• BFI — Brute Force and Ignorance. An expression found in everyday language since the early 1900s, meaning a heavy handed unrefined solution to a problem (especially fixing something - like bashing an electrical appliance to get it working again). In more recent
• SLA — Service Level Agreement
• ATOM — Any Transport over MPLS (Multi-Protocol Label Switching)
• DARPA — Defense Advanced Research Projects Agency (US)
• PDA — Personal Digital Assistant
• MIS — Management Information System (OSHA)
• RFQ — Request For Quotation
• ACE — Access Control Entry
• MLS — Microwave Landing System
• I.LINK — IEEE 1394, High Performance Serial Bus, implementation
• D-NBAP — Dedicated Node B Application Part
• AM — Amplitude Modulation
• ICT — Information and Communication Technology
• MDF — Main Distribution Frame
• CD — Compact Disc
• POS — Point Of Sale.Retail term, being the physical point at which products are displayed on shelves or paid for at the checkout, as in the EPOS acronym.
• CRM — Customer Relationship Management
• OCR — Optical Character Recognition
• PCB — printed circuit board
• M-CSI — Mobility management CAMEL (Customized Applications for Mobile network Enhanced Logic) Subscription Information
• ESA — European Space Agency
• SWAG — Scientific Wild Ass Guess
• T-CARRIER — Trunk Carrier
• CAD — Computer Aided Designer
• PGP — Pretty Good Privacy (encryption)
• EOM — End Of Message
• AM — Ante Meridian
• RAM — random-access memory
• ASA — American Standards Association
• CSMA/CD — Carrier sense multiple access / collision detection
• RFI — Request For Information. Sales department shorthand. Special priority when use in conjunction with RFN (see below).
• NSF — National Sanitation Foundation
• SABGW — System Architecture Evolution Gateway
• MOB — Mobile
• T-IC — T-interConnect

• H323 — ANSI standard for format over IP
• C³CM — Command, Control and Communications Countermeasures
• AGC — Automatic Gain Control
• ABI — Application Binary Interface
• ISDN — Integrated Services Digital Network
• OC-9 — Optical Carrier Signal, Level 9
• CC — Carbon Copy
• CAE — Computer-Aided Engineering
• BBS — Bulletin Board System
• ATA — Area Transportation Authority
• DSS — Decision Support System
• JV — Joint Venture
• TNX — Thanks
• TTYL — Talk To You Later (Internet Slang)
• CIO — Chief Information Officer
• VC-ATOD — Virtual Clearinghouse on Alcohol, Tobacco and Other Drugs
• FSAI — Fiber Serving Area Interface
• ECU — Electronic Control Unit
• KBYTE — Kilobyte (103)
• DRAM — Dynamic Random Access Memory (dee-ram) (computing)
• WAN — Wide Area Network
• IVR — Interactive Voice Response (telephone technology)
• DES — Data Encryption Standard
• GATT — General Agreement on Tariffs and Trade (government)
• CDT — Central Daylight Time
• IETF — Internet Engineering Task Force
• FIPS — Federal Information Processing Standard
• RQMTS — Requirements
• RFC — Request For Comment
• RPI — Retail Price Index
• DHCP — Dynamic Host Configuration Protocol
• COO — Chief Operation Officer
• LED — law enforcement desk; light emitting diode
• EIS — Executive Information System
• HVAC — Heating, Ventilation, and Air Conditioning
• CONG — Congestion message
• RFO — Reason For Outage
• POP — Point Of Presence (Internet)
• VAZO — Violating All-Zero Octet
• CBT — Computer Based Training
• PC — Personal computer (host)
• CSMA — Carrier Sense Multiple Access
• SDD — Software Design Document
• CPM — Critical Path Method
• BCC — Blind Carbon Copy
• WML — Wireless Markup Language
• CSA — Canadian Space Agency
• RDBMS — Relational Database Management System
• ASP — Application Service Provider
• QOS — Quality of Service

• EDS — Electronic Data Systems Corporation
• ATC — Air traffic control
• FAA — Federal Aviation Administration
• WYSIWYG — What You See Is What You Get (pronounced Wizzy-wig. See Entry For Derived Acronyms)
• DOS — Disk Operating System
• AIR — Account Information and Refill
• CMS — Content Management System
• ROI — Return on Investment
• DBORS — Data Base of Records
• CST — Central Standard Time (UTC-6 Hours)
• FFT — Fast Fourier Transform
• SAR — Search And Rescue
• CIR — Committed Information Rate (Frame Relay)
• SQL — Structured Query Language
• SAN — Storage Area Network
• IRS — U.S. Internal Revenue Service
• ACM — Association for Computing Machinery
• MTTR — Mean Time To Repair
• ITU — International Telecommunication Union
• PUHU — Pick Up Hang Up
• NFS — Network File System
• AES — Advanced Encryption Standard
• DSC — Differential Scanning Calorimetry
• PNG — Portable Network Graphics (graphic file standard/extension)
• HZ — cycles per second (hertz)
• KISS — Keep It Simple Stupid
• NYSE — New York Stock Exchange
• QMS — Quality Management System
• CGI — Common Gateway Interface
• ADD — Addendum
• CUG — Closed User Group
• SDR — Special Drawing Rights
• DNS — Domain Name System
• CIS — Commonwealth of Independent States
• PDH — Plesiochronous Digital Hierarchy
• DNS — Domain Name Service
• RPM — Resale Price Maintenance. The UK Net Book Agreement, as was. Means by which retail prices are controlled by primary suppliers. (Alternatively, Revolutions Per Minute, as in engine speed and 78, 33 and 45 records. In years to come how many people will know
• CFO — Communication Filing Officer
• NATO — North Atlantic Treaty Organisation
• PRI — Primary Rate Interface (ISDN)
• SLIP — Serial Line Interface Protocol
• RDY — Ready
• DCOM — Distributed Component Object Model
• ECO — Engineering Change Order
• NIST — National Institute of Standards and Technology
• ADM — Add-Drop Multiplexer
• VHF — Very High Frequency
• COR — Carrier Operated Relay
• WWW3 — World Wide Web Consortium
• EEC — European Economic Community (predecessor of the European Union|EU)

• FX — Foreign Exchange
• VM — Voice Mail
• DLL — Dynamic Link Library (computer file)
• ATCRBS — Air Traffic Control Radar Beacon System
• DSL — Digital Subscriber Line
• UTC — Coordinated Universal Time
• DAM — Diagnostic Acceptability Measure
• SAS — Statistical Analysis System
• SQA — Software Quality Assurance
• UDP — User Datagram Protocol (FDDI related)
• BPS — bits per second
• DAC — Discretionary Access Control
• CAM — computer aided manufacturing
• SIC — Standard Industrial Classification (Code)
• EFT — Electronic Funds Transfer
• PM — Preventive Maintenance
• EOT — End Of Transmission
• PST — Pacific Standard Time (UTC-8 Hours)
• Q&A — Question & Answer
• DBMS — Database Management System
• EVP — Executive Vice President
• EC — European Commission
• SSL — Secure Socket Layer
• DOJ — Department of Justice (US)
• AOL — America on line
• GSA — U.S. General Services Administration
• AE — Account Executive
• MB — Megabyte
• UI — User Interface
• ADR — Address
• CLI — Command line Interface (Cabletron)
• NMR — Nuclear Magnetic Resonance
• BVR — Beyond Visual Range
• ROFL — Rolling on the floor laughing
• UAV — Unmanned Aerial Vehicle
• NPI — New Product Introduction
• IP — Intellectual Property
• DB — Decibel
• MIPS — Millions of Instructions Per Second
• NA — Not Applicable
• GPRS — General Packet Radio Service
• BSOD — Blue Screen Of Death
• VVX — Voice and Video eXchange
• NIH — Not Invented Here
• EDT — Eastern Daylight Time
• MST — Mountain Standard Time
• EEG — Electro-EncephaloGram
• OFC — Office
• SCM — Supply Chain Management
• FCC — Federal Communications Commission (US)

• NOS — Network Operating System
• EBCDIC — Extended Binary Coded Decimal Interchange Code (pronounced Eb-see-dik) (cf. BCD)
• NTIS — National Technical Information Service Technology Administration
• PSTN — Public Switched Telephone Network
• AAAS — American Association for the Advancement of Science
• ACE — Advanced Computing Environment
• ACK — ACKnowledgment
• AGP — Accelerated Graphics Port
• DC — Direct Current
• UHF — Ultra High Frequency (300-3000 MHz; 1m-10cm)
• AT&T — American Telephone and Telegraph (U.S. company, also known as "Ma Bell")
• SCSI — Small Computer System Interface
• ACL — Access Control List
• DDE — Dynamic Data Exchange (in software parlance)
• NEC — National Electrical Code
• BR — Branch
• D-H — Diffie-Hellman
• USGS — United States Geological Survey (DOI)
• WWW — World Weather Watch
• TCO — Total Cost of Ownership
• AOA — Angle Of Arrival
• CS — Computer Science
• UN — United Narions
• NOAA — National Oceanic and Atmospheric Administration (US)
• B2B — Business to Businesse
• ADPE — Automatic Data Processing Equipment
• BPR — Business Process Re-engineering
• UPS — Ultraviolet Photoelectron Spectroscopy
• ABET — Accreditation Board for Engineering and Technology, Inc.
• CRC — Contrôle de Redondance Cyclique (French: Cyclic Redundancy Check)
• W3C — World Wide Web Consortium
• PERT — Program Evaluation and Review Technique
• LF — Low Frequency
• AQL — Acceptable Quality Level
• CUL — See You Later
• AIS — Automated Information System
• CMM — Capability Maturity Model
• STP — standard temperature and pressure (0° and 1 atm)
• MHS — Message Handling System (electronic)
• DQPSK — Differential Quadrature Phase-Shift Keying
• CPT — Carriage Paid To
• OSHA — Occupational Safety and Health Act (1970)
• CAA — Civil Aviation Authority
• EDVAC — Electronic Discrete Variable Automatic Computer
• RWR — Radar Warning Receiver
• M — Meter
• IANA — Internet Assigned Numbers Authority
• BRI — Basic Rate Interface
• SOHO — Small Office Home Office
• APT — Automatic Picture Transmission

• SCC — Standards Council of Canada
• MBR — Master Boot Record
• OS — Operating System
• DSA — Digital Signature Algorithm
• BST — British Summer Time
• NEMA — National Electric Manufacturer's Association
• OMG — Object Management Group
• CIA — Central Intelligence Agency
• AT&T — American Telephone & Telegraph
• LMS — Learning management system
• MSN — Microsoft Network
• TCP — Transmission Control Protocol
• PMA — Physical Medium Attachment
• I/O — Input/Output
• ERP — Enterprise Resource Planning
• SBU — Strategic Business Units
• PM — Project Manager
• DDD — Direct Distance Dial
• RAID — Redundant Array of Inexpensive Disks
• BSD — Berkeley Software Distribution
• T&C — Terms & Conditions
• 9 — Nine
• AAC — Advanced Audio Coding
• IM — Instant Message
• PVC — Permanent Virtual Circuit (ATM)
• ACC — Adaptive Cruise Control
• RM — Regional Manager
• DDL — Data Definition Language
• SDMA — Space Division Multiple Access
• DTE — Data Terminal Equipment
• JPEG — Joint Photographic Experts Group (24-bit image storage format)
• SAIC — Science Applications International Corporation
• TC — Telephone Call
• FDDI — Fiber Distributed Data Interface
• MLS — Multiple Listing Service
• TNYWR — The Number You Will Receive
• TNSTAAFL — There's No Such Thing As A Free Lunch
• AWG — American Wire Gauge
• ROS — Return on Sales
• KHZ — kilohertz (1000 cycles per second)
• FM — frequency modulation
• CB — Call Back
• DWDM — Dense Wavelength-Division Multiplexing
• HTML — Hyper Text Markup Language
• MAC — Media Access Control
• RFD — Request For Discussion
• WMO — World Meteorological Organization (ICSU)
• OM — Old Man
• SNMP — Simple Network Management Protocol (ATM)
• ZIP — Zone Improvement Plan

• Z — Zero
• ERT — Emergency Response Team
• SAE — Society of Automotive Engineers
• KM — Knowledge Management
• BT — British Telecommunications
• WDM — Wavelength Division Multiplexing (fiber optics)
• CDMA — Code Division Multiple Access (voice/data transmission)
• PBX — Private Branch eXchange (company phone system)
• CU — Control Unit
• ISBN — International Standard Book Number (ISO 2108)
• PECVD — Plasma-Enhanced Chemical Vapor Deposition
• PM — post meridian
• ABR — Available Bit Rate
• AADC — Automated Area Distribution Center
• ENIAC — Electronic Numerical Integrator And Computer
• ADT — Atlantic Daylight Time (UTC-3 Hours)
• BER — Bit-Error Rate
• CORBA — Common Object Request Broker Architecture
• ICANN — Internet Corporation for Assigned Names and Numbers
• WEP — Wired Equivalent Privacy
• CM — Configuration Management
• ADN — Advanced Digital Network
• DME — Distance Measuring Equipment
• AC — Access Control
• USB — Universal Serial Bus
• LD — Long Distance
• RFI — Radio Frequency Interference
• AFC — Automatic Frequency Control
• DMSP — Defense Meteorological Satellite Program (U.S.)
• EAI — Enterprise Application Integration
• AF — Audio Frequency
• TV — Television
• BIOS — Basic Input Output System
• MMS — Multimedia Messaging Service
• NRC — National Research Council (Canada)
• SEI — Software Engineering Institute
• PDN — Public Data Network
• EMG — Electromyogram
• JAXA — Japan Aerospace Exploration Agency
• DMA — direct memory access (computer term)
• WAP — Wireless Application Protocol
• Y2K — Year 2000
• CIS — CompuServe Information Service
• EEPROM — Electrically Erasable Programmable Read-Only Memory
• 100BASE-T2 — 100 Megabits per Second, Baseband, Two-pair Category 3 UTP cables
• ROTFL — Roll On The Floor Laughing
• LEO — Low Earth Orbit (satellite communications)
• RSN — Real Soon Now [which may be a long time coming]
• MGMT — Management
• WTO — World Trade Organisation

• RMS — root mean square (preferred over "RMS")
• CW — Continuous Wave
• SHA — Secure Hash Algorithm
• NIC — Network Interface Card
• GB — Gigabyte
• AATSR — Advanced Along-Track Scanning Radiometer
• EOB — End Of Business
• CMD — Command
• AYT — Are You There
• PPP — Point-to-Point Protocol
• ISS — International Space Station
• DC — Disconnected
• COQ — Cost Of Quality
• ISSN — International Standard Serial Number (ISO 3297)
• EPR — Ethylene-Propylene Rubber
• NIMBY — Not In My Back Yard
• ASEAN — Association of South East Asian Nations
• ALC — Automatic Level Control
• VR — Virtual Reality
• OBO — Or Best Offer
• ECP — Engineering Change Proposals
• DTI — Department of Trade and Industry (UK)
• NIST — National Institute of Standards & Technology (US)
• PPB — parts per billion (109)
• CCM — counter-countermeasure
• CG — Center of Gravity (DXS)
• ACTV — Active
• ACD — Automatic Call Distributor
• AAAI — American Association for Artificial Intelligence's
• DFD — Displaced Frame Difference
• MIME — Multipurpose Internet Mail Extension
• AE — Application Entity
• EMC — Electromagnetic Compatibility
• CTD — Cumulative Trauma Disorder
• RPC — Remote Procedure Call
• NBS — National Bureau of Standards (US)
• CFV — Call For Vote(s)
• NAFTA — North American Free Trade Agreement
• AEC — Architecture, Engineering, Construction
• HDML — Handheld Device Markup Language
• RM — Resource Management
• SNR — Signal-to-Noise Ratio
• ASR — Airport Surveillance Radar
• EW — Electronic Warfare
• DSP — Digital Signal Processor
• SVP — Senior Vice President
• OSI — Open Systems Interconnection (iso Standard)
• ELF — Extremely Low Frequency
• YL — Young Lady
• CCSDS — Consultative/Consultative Committee for Space Data Systems

• LEC — Local Exchange Carrier
• DRM — Digital Rights Management
• EISA — Extended Industry Standard Architecture
• ELINT — Electronic Intelligence Satellite
• EDP — Electronic Data Processing Plc (London Stock Exchange [LSE])
• VBR — Variable Bit Rate (ATM)
• CRL — Certificate Revocation List
• AME — Amplitude Modulation Equivalent
• ECE — Economische Commissie voor Europa (United Nations) (Dutch: Economic Commission for Europe)
• BIP — Bit-Interleaved Parity
• APPL — Application
• CCNA — Cisco Certified Network Associated
• EEHO — Either End Hop Off
• HW — Hardware
• BCD — Binary-Coded Decimal
• DLR — Design Layout Record
• PD — Public Domain
• AMT — Amount
• MBPS — Megabits per second
• PSK — phase-shift keying
• PDU — Protocol data unit (such as segment, packet, frame, etc.)
• DQE — Detective Quantum Efficiency
• ATS — applications technology satellite
• SDH — Synchronous Digital Hierarchy (ATM)
• CES — Consumer Electronics Show
• SMS — Short Message Service
• AVHRR — Advanced Very High Resolution Radiometer  
• AES — Auger Electron Spectroscopy
• BYOD — Bring Your Own Device
• STS — Space Transportation System
• ICMP — Internet Control Message Protocol
• DSSS — Direct Sequence Spread Spectrum
• CAD — Computer-Aided Design
• EAP — Extensible Authentication Protocol
• LDAP — Lightweight Directory Access Protocol (pronounced Ell-dap)
• SPC — Statistical Process Control. Forerunning quality theory from the 1960s to TQC and TQM.
• WIPO — World Intellectual Property Organization
• ATN — Aeronautical Telecommunication Network
• NSA — National Security Agency
• PIN — Personal Identification Number
• UPS — Uninterruptible Power Supply
• CFD — Call For Discussion
• PET — positron emission tomography
• BUS — Business
• WB — Write Back
• NCSA — National Center for Supercomputing Applications
• SOGA — Share of Gross Adds
• CIM — Common Information Model
• AD — Active Directory
• FASB — Financial Accounting Standards Board

• ISAKMP — Internet Security Association and Key Management Protocol
• VOL — Volume
• CLM — Career Limiting Move. A reminder to think twice before embarking on any action that has an obvious whiff of disaster about it. (Ack R Gesling and S Phillips)
• 911 — Emergency Services Phone Number
• CHAP — Challenge Handshake Authentication Protocol (ATM)
• MIB — Management Information Base (ATM)
• AVL — Available
• RU — Are You?
• PCMCIA — Personal Computer Memory Card International Association
• LCP — Link Control Protocol
• LRJ — Location Reject
• SGML — Standard Generalized Markup Language
• SBC — Southwestern Bell Corporation
• RIP — Routing Information Protocol
• TCP/IP — transmission control protocol/internet protocol
• CCSD — command communications service designator; control communications service designator
• NTIA — National Telecommunications and Information Administration
• MF — Medium Frequency
• USD — United States Dollar
• RNC — Radio Network Controller
• CG — Coast Guard
• FCS — Frame check sequence (Ethernet)
• LF — Line Feed
• DCN — Design Change Notification
• BGP — Border Gateway Protocol (routing protocol)
• IEC — International Electrotechnical Commission
• VLF — Very Low Frequency
• CRIS — Carrier Route Information System
• ACPI — Advanced Configuration and Power Interface
• ARA — Apple Remote Access
• WORM — Write-Once, Read-Many
• RTU — Remote Terminal Unit
• EGA — Enhanced Graphics Adapter
• EDD — Envelope Delay Distortion
• ASQC — American Society for Quality Control's
• VAC — Vacant
• ITSEC — Information Technology Security Evaluation Criteria
• SCADA — Supervisory Control And Data Aquisition
• BNSC — British National Space Centre
• CMI — Computer Managed Instruction
• TEL — Telephone
• OCC — Occupancy
• IRS — Interface Requirements Specification
• AIS — Alarm Indication Signal
• RACON — Radar Beacon
• OLE — Object Linking and Embedding (Microsoft communication protocol)
• PT — Project Team
• DOM — Document Object Model
• JPL — Jet Propulsion Laboratory (California Institute of Technology) (NASA)
• SIG — Special Interest Group

• CHF — Swiss Franc
• HTTPS — HyperText Transfer Protocol Secure
• ADC — Analog-Digital Converter
• MS — Millisecond
• DSTE — Digital Subscriber Terminal Equipment
• EFF — Electronic Frontier Foundation
• AMI — Advanced Metering Infrastructure
• IPVX — Internet Protocol version X
• MMU — Memory Management Unit
• ISAS — Institute of Space and Astronautical Sciences (Japan)
• VOIP — Voice Over IP (Internet Protocol)
• MAC — Message Authentication Code
• PABX — private automatic branch exchange (telephone)
• SOAP — Simple Object Access Protocol
• PCM — Pulse-Code Modulation
• MRC — Monthly Recurring Charge
• OSPF — Open Shortest Path First (ATM)
• ECMA — European Computer Manufacturer's Association
• B2C — Business-to-Consumer
• FAR — Federal Aviation Regulation
• ISMI — International mobile subscriber identity
• C4 — Command, Control, Communications, and Computers
• ACT — ACTIVITY, ACTIVITIES
• BOFH — Bastard Operator From Hell
• LP — Low Pressure
• CSO — Customer Service Operations
• RACF — Resource Access Control Facility
• PLD — Programmable Logic Device
• APIC — Advanced Programmable Interrupt Controller
• TCB — Trusted Computing Base
• BIS — Bureau of Indian Standards
• DFS — Distributed File System
• OSS — Operational Support System
• ESF — Extended Super Frame (ATM)
• ASQ — Alpha System Qualification
• HF — High Frequency
• 100BASE-T — 100 Megabits per second, Baseband, Twisted pair
• CMP — Connection Management Protocol
• TAG — Technical Advisory Group for Biological Control Agents of Weeds
• QAM — quadrature amplitude modulation
• D-RAM — Dynamic Random Access Memory
• FCA — Free Carrier
• JST — Japan Standard Time
• HSDPA — High-Speed Downlink Packet Access
• SDK — Software Development Kit (Microsoft)
• RDP — Radar Data Processing
• MCD — Magnetic Circular Dichroism
• ECR — Electronic Cash Register
• AMHS — Automated Message Handling System
• CBC — cipher block chaining

• CCD — Charge Coupled Device - a device for the movement of electrical charge.
• BUR — Bandwidth Usage Redundancy
• BPRZ — Bipolar Return-to-Zero
• EMS — Express Mail Service
• ADT — Abstract Data Type
• BG — Background
• JVM — Java Virtual Machine
• AT — Advanced Technology
• AP — Application Protocol
• NOC — Network Operations Center
• CDR — Call-Detail Record
• BSA — Business Software Alliance
• CFD — computational fluid dynamics
• BJT — Bipolar Junction Transistor
• NESDIS — National Environmental Satellite, Data, and Information Service
• FTTB — Fiber To The Building
• DCE — Distributed Computing Environment
• DSCP — Differentiated Services Control Point
• VIRUS — Vital Information Resources Under Siege
• PE — Polyethylene
• GHZ — Gigahertz
• IRDA — Infrared Data Association
• RAD — Rapid Application Development
• DTX — Discontinuous Transmission
• TLS — Transport Layer Security
• HDLC — High-Level Data Link Control
• VTC — Video Teleconference
• RFS — Request For Service
• QI — Quality Improvement
• WG — Working Group
• BAN — Base Area Network
• ANI — Automatic Number Identification (Caller ID)
• POTS — Plain Old Telephone Service (FCW)
• DASD — Direct Access Storage Device
• CFE — Contractor-Furnished Equipment
• KB — Kilobyte: One thousand and twenty-four bytes kbps kilo bit per second
• MDA — Monochrome Display Adapter
• VOC — Volatile Organic Compounds (air pollution)
• VB — Visual Basic
• URI — Uniform Resource Identifier
• NIC — Network Information Center
• ADM — Add/Drop Multiplexer
• JSC — Johnson Space Center (Houston, TX)
• PRF — Pulse Repetition Frequency
• RCU — Remote Control Unit
• ADP — Automatic Data Processor
• CMC — Career Management Center
• CRBT — Caller Ring Back Tone
• ASK — amplitude shift keying
• PAR — Precision Approach Radar

• DSA — Directory System Agent
• WLAN — Wireless Local Area Network
• ADF — Automatic Direction Finder
• NNTP — Network News Transfer Protocol
• HSD — High Speed Data
• SP — Service Provider
• SPC — Stored Program Control
• EC — European Community
• MDA — Model Driven Architecture
• GRE — Generic Routing Encapsulation
• RH — Relative Humidity
• TB — Terabyte
• DSN — Deep Space Network - network of large antennas and communication facilities.
• TRLR — Trailer
• AU — Audio Unit
• RSVP — Resource Reservation Protocol (Internet)
• AS — Autonomous System
• 3G — Third Generation mobile phone network
• PKI — Public Key Infrastructure (cryptography)
• MIT — Massachusetts Institute of Technology (U.S.)
• CERT — Computer Emergency Response Team
• IMSI — International Mobile Subscriber Identity
• CIC — Circuit Identification Code
• IMEI — International Mobile Equipment Identity
• EHF — Extremely High Frequency
• STA — State
• NMS — Network Management System
• UML — Unified Modeling Language (Object Management Group, OMG)
• ATF — Advanced Tactical Fighter
• APS — Automatic Protection Switching (SONET/SDH)
• BOC — Bell Operating Company
• OD — Outside Diameter
• COMINT — Communications Intelligence
• APC — American Power Conversion
• RSVD — Reserved
• ISRO — Indian Space Research Organisation
• YAHOO — You Are Hazy Over Oranges
• TPDU — Transport Protocol Data Unit
• PDS — Protected Distribution System
• LPE — Liquid Phase Epitaxy
• NAS — Network Access Server
• BLOS — Beyond Line-Of-Sight
• ADCCP — Advanced Data Communications Control Procedures
• DOT — Department of Telecommunications (India)
• BS — Base Station
• SML/SMS — Service Management Layer/Service Management Service
• RAN — Radio Access Network
• AXE 10 — Series of electronic telephone exchanges from L.M. Ericsson
• STM — Short Term Memory
• SMI — Structure of Management Information

• TOS — Type Of Service
• DCMI — Dublin Core Metadata Initiative (Online Computer Library Center)
• TTYL — Type To You Later
• YABA — Yet Another Bloody Acronym
• NIS — Network Information Service
• ATM — Adobe Type Manager
• BECN — Backward Explicit Congestion Notification
• PWD — Password
• WPAN — Wireless Personal Area Network
• MPLS — Multi Protocol Label Switching
• CGI — Computer-Generated Imagery
• ODBC — Open Database Connectivity
• MVS — Multiple Virtual Storage
• LR-WPAN — Low-Rate Wireless Personal Area Network
• TKIP — Temporal Key Integrity Protocol
• MOS — Model Output Statistics
• LZ — Landing Zone
• CATV — Cable Television
• VXML — Voice eXtensible Markup Language
• MTU — Maximum Transmission Unit
• NSAI — National Standards Authority of Ireland
• DTR — Data Terminal Ready
• DIT — Directory Information Tree
• BPDU — Bridge Protocol Data Unit
• ARG — Argument
• NFPA — National Fire Protection Association
• CGM — Computer Graphics Metafile
• SAR — Specific Absorption Rate
• LQC — Line Quality Control
• MPEG — Motion Picture Experts Group
• RARP — Reverse Address Resolution Protocol
• ASTD — American Society of Training and Development (Alexandria, Virginia)
• FAX — Facsimile
• OTN — Optical Transport Network
• ACO — Additional Call Offering
• FR — Frame Relay
• VCC — Virtual Channel Connection (ATM)
• NCS — National Communications System
• PCI — Peripheral Component Interconnect
• IPX — Internetwork Packet Exchange
• MS — Mobile Station
• B3ZS — bipolar 3-zero substitution
• TDMA — Time Division Multiple Access
• CA — Certificate Authority
• SIL — Speech Interference Level
• PAN — Personal Area Network
• SIT — Static Induction Transistor
• MTSO — Mobile Telephone Switching Office
• MIS — Management Information Service
• FEC — Forward Error Correction

• BBU — Baseband Unit
• B-ISDN — Broadband Integrated Services Digital Network
• ESTEC — European Space Research and Technology Centre
• RDF — Radio Direction Finder
• CC — Country Code
• DID — direct inward dial
• DUP — Duplicate
• VAS — Value Added Services
• CIFS — Common Internet File System
• EEA — European Economic Area
• RCC — Rescue Coordination Center
• LCN — Logical Channel Number
• FTTH — Fiber To The Home
• COM — Component Object Model
• CBEMA — Computer & Business Equipment Manufacturers Association
• WPM — speech--words per minute
• SW — South West
• CAUCE — Coalition Against Unsolicited Commercial Email
• MIC — Message Integrity Check
• FCA — Free Carrier Absorption
• AEW — Airborne Early Warning
• PDN — Packet Data Network
• DLC — Digital Loop Carrier
• ARIN — American Registry for Internet Numbers
• UA — User Agent
• HSS — Home Subscriber Server
• ITT — Invitation To Tender
• EPR — Electron Paramagnetic Resonance
• TG — Task Group
• IS — Intermediate System
• IS — International Standard
• NMT — Nordic Mobile Telephone
• ECN — Explicit Congestion Notification
• APM — Advanced Power Management
• EGP — Exterior Gateway Protocol
• MS — Message Store
• GOS — Grade Of Service
• UAS — Unavailable Seconds
• IV — Initialization Vector
• TTY — Teletype Telex Machine
• SCTP — Stream Control Transmission Protocol
• ASR — Automatic Speech Recognition
• SKU — Stockkeeping Unit
• NLM — National Library of Medicine (National Institutes of Health)
• CATV — Community Antenna Television
• KDC — Kerberos Key Distribution Center
• ES — Errored Second
• AMI — Alternate Mark Inversion
• OMA — Open Mobile Alliance
• ARQ — Automatic Repeat-reQuest

• SAR — synthetic aperture radar (satellite)
• YP — Yellow Pages
• FAT — File Allocation Table
• PPARC — Particle Physics and Astronomy Research Council
• MS — Management System
• AR — Access Rate
• ELT — Emergency Locator Transmitter
• TM — Technical Manual
• ASIC — application-specific integration circuit
• IEEE-SA — Institute of Electrical and Electronics Engineers - Standards Association
• WK — Week
• CPS — characters per second
• NOTAM — Notice to Airmen
• ISA — Industry Standard Architecture
• ACAP — Application Configuration Access Protocol
• LLC — Logical Link Control
• CPS — Cycles Per Second (now Hertz)
• IW — Information Warfare
• 3GPP — Third Generation Partnership Project
• DDN — U.S. Defense Data Network
• PAP — Password Authentication Protocol (ATM)
• APN — An Access Point Name
• SRS — Software Requirements Specifications
• DCS — Digital Cross-connect System
• NOAO — National Optical Astronomy Observatories (Tucson, AZ)
• ADF — automatic document feeder
• SHF — Super High Frequency
• LIU — Line Interface Unit
• DDS — Digital Data Service
• VOD — Video On Demand
• OSTP — Office of Science and Technology Policy
• BER — Basic Encoding Rules (ASN.1)
• JIS — Japanese Industrial Standard
• RCV — Receive
• TIA — Telecommunications Industry Association
• FCP — Fibre Channel Protocol
• RSS — Really Simple Syndication
• E — Echo Time Zone
• ABBR — Abbreviation
• CS — Cable Select
• MCC — Mission Control Center (JSC)
• ADB — Apple Desktop Bus
• SLF — Super Low Frequency
• FC — Fibre Channel
• SDLC — Synchronous Data Link Control
• NTP — Network Time Protocol
• DMTS — Distinguished Member Of Technical Staff
• MCSD — Microsoft Certified Solution Developer
• MSU — Microwave Sounding Unit
• ORB — Object Request Broker

• NE — North-East
• OAS — Organization of American States
• PLMN — Public Land Mobile Network
• DDCMP — Digital Data Communications Message Protocol
• RCS — Radar Cross Section
• TCSEC — Trusted Computer System Evaluation Criteria
• VMS — Virtual Memory System
• 100BASE-T4 — 100 Megabits per Second, Baseband, Four-pair Category 3 UTP cables
• IIS — Internet Information Services
• CAV — Constant Angular Velocity
• CCTA — Central Computer and Telecommunications Agency
• ARINC — Aeronautical Radio Incorporated
• MHS — Microwave Humidity Sounder
• DA — Destination Address
• ISO — Infrared Space Observatory
• CFA — Carrier Facility Assignment
• ASI — Asynchronous Serial Interface
• DNIS — Dialed Number Identification Service
• SSM — Source-Specific Multicast
• ACFQ — Absence Compensation Fair Queuing
• SDM — Service Delivery Management
• CICS — Customer Information Control System (IBM Mainframe Software; Kicks Or C-I-C-S)
• ISO — Independent System Operator (US) (see also TSO) Responsible for grid management, but does not own assets. (electricity)
• PDC — Personal Digital Cellular
• CTS — Clear To Send
• LPC — Linear Predictive Coding
• SXS — Step-By-Step
• NTFS — New Technology File System
• QPSK — aeronautical quadrature phase shift keying
• CU — Channel Unit
• CCIS — Common Channel Interoffice Signaling
• ESS — Electronic Switching System
• VM — Virtual Machine
• DPC — Destination Point Code
• CDE — Common Desktop Environment
• BT — BlueTooth
• VSAT — Very Small Aperture Terminal (satellite service)
• EMR — Electromagnetic Radiation
• DVMRP — Distance Vector Multicast Routing Protocol
• STP — Spanning Tree Protocol
• RTS — Request To Send
• AFS — Andrew File System
• NCP — Network Control Protocol
• SEM — Space Environment Monitor
• AWACS — Airborne Warning And Control System
• CAB — Conformity Assessment Body
• BERT — Bit Error Rate Tester (telecommunication)
• ME — Mobile Equipment
• 1000BASE-T — 1000 Megabits per Second, Baseband, Twisted Pair
• OLAP — Online Analytical Processing

• DAP — Directory Access Protocol
• ATSR — Along-Track Scanning Radiometer
• UL — Uplink
• EULA — End User License Agreement (usually in reference to software)
• WCDMA — Wideband Code Division Multiple Access
• LLU — Local Loop Unbundling
• MCA — Micro Channel Architecture
• PTP — Point to Point Transmission Service (electricity)
• SDP — Session Description Protocol
• WS — Workstation
• RT — Radiotelephone
• EPABX — Electronic Private Automatic Branch Exchange
• ACR — Attenuation Crosstalk Ratio
• AIFF — Audio Interchange File Format
• OTA — Office of Technology Assessment (U.S.; abolished by Congress, Fall 1995)
• CIM — Corporate Information Management
• NREN — National Research and Education Network
• SONET — Synchronous Optical Network
• VGA — Video Graphics Array
• MCU — Multipoint Control Unit
• DTD — Document Type Definition (XML)
• CAM — Computer-Aided Mapping
• DAT — Digital Audio Tape
• ECM — Electronic Counter Measures
• AFOSR — Air Force Office Of Scientific Research(USA)
• IRQ — Interrupt Request
• VRML — Virtual Reality Modeling Language
• MSRN — Mobile Station Roaming Number
• VLSI — Very-Large-Scale Integration
• TWT — Traveling Wave Tube
• DS — Digital Signal
• OAM&P — Operations, Administration, Maintenance & Provisioning
• HSCSD — High-Speed Circuit-Switched Data
• BRA — Basic Rate Access
• TE — Traffic Engineering
• MMB — Middle Mouse Button
• EAC — Engineering Accreditation Commission
• BIU — Bus Interface Unit
• SYM — Symmetric
• DSS — Digital Signature Standard
• CSA — Canadian Standards Association (like UL)
• FEP — Front End Processor
• DCE — Data Communication Equipment
• DID — data item description
• AFM — Atomic Force Microscopy
• TO — Technical Order
• IMC — Intermediate Metal Conduit
• FMC — Fixed Mobile Convergence "Mobile UC or Unified Communications over Wireless"
• JCL — Job Control Language
• PROM — Programmable Read-Only Memory

• AOI — Area Of Interest
• BS — Beam Splitter
• OSS — Operations Support System
• MME — Mobility Management Entity
• VF — Voice Frequency
• DIS — Distributed Interactive Simulation
• DSLAM — Digital Subscriber Line Access Multiplexer (Module)
• CF — Compact Flash
• AMR — Automated meter reading also known as Automatic Meter Reading
• ERP — Enterprise Resource Management
• ARPU — Average Revenue Per User
• FCW — Federal Computer Week
• EX — Exercise
• VDS — Variable Depth Sonar
• MMSI — Maritime Mobile Service Identity
• COAX — Coaxial
• DIBL — Drain-induced Barrier Lowering
• ISI — Inter-Symbol Interference
• DX — Duplex
• SOS — Save Our Souls (Help!)
• ADEOS — ADvanced Earth Observing Satellite (Japan)
• TAC — Technical Assistance Center
• TDM — Time Division Multiplexer
• SMDS — Switched Multimegabit Data Service (ATM)
• GBPS — Gigabits per second
• ECPA — Electronic Communications Privacy Act 1986
• SVC — Scalable Video Coding
• RSRQ — Reference Signal Received Quality
• CAN — Campus Area Network
• JTF — Joint Task Force
• EMCON — Electromagnetic Emission Control
• CBDS — Connectionless Broadband Data Service
• CBR — Constant Bit Rate
• SLP — Service Location Protocol
• AMPS — Advanced Mobile Phone System
• TOA — Time Of Arrival
• SPA — Special Prorate Agreement
• PIM — Personal Information Manager
• CDA — Command and Data Acquisition
• CAL — Calorie
• MAJ — Major
• POE — power over ethernetinjector
• TOP — Technical Office Protocol
• AMLCD — Active Matrix Liquid Crystal Display
• TE — Terminal Equipment
• ISOC — Internet Society
• E — Energy
• ADL — Advanced Distributed Learning
• NE — Network Element
• IAB — Internet Architecture Board

• FXO — Foreign Exchange Office
• WMAN — Wireless Metropolitan Area Network
• WAR — Weekly Activity Report
• VLL — Virtual Leased Line
• ABN — Abnormal
• SPGA — Staggered Pin Grid Array
• TEC — Total Electron Content
• TDOA — Time Difference Of Arrival
• LISP — List Processing Language
• EMS — Enhanced Messaging Service
• ZIP — Zone Information Protocol
• DT — DWDM (Dense Wavelength Division Multiplexing) Terminal
• DSN — Defense Switched Network
• DBS — Direct Broadcast Satellite
• CABS — Carrier Access Billing System
• COO — Cost of Ownership
• SA — Scientific American
• IV&V — independent verification and validation
• EIA — Extended Interaction Amplifier
• AT — Access Tandem
• BACP — Bandwidth Allocation Control Protocol
• VC — Virtual Channel
• JDK — Java Development Kit
• TFTP — Trivial File Transfer Protocol (ATM)
• CDS — Cell Directory Service
• WTLS — Wireless Transport Layer Security
• JRE — Java Runtime Environment
• OC — Optical Carrier
• IMPACT — Integrated Manufacturing Precision Assembly Cellular Technology
• 10BASE-T — 10 Megabits per second, Baseband, Twisted pair
• DISA — U.S. Defense Information Systems Agency
• SM — Senior Member
• ATS — Automatic Transfer Switch
• DCS — Data Collection System (NOAA Polar Orbiting Satellites)
• AP — access point
• WINS — Windows Internet Name Service
• LSR — Local Service Request
• NI — Network Interface
• HLR — Home Location Register
• RMI — Remote Method Invocation
• CAC — Connection Admission Control (Asynchronous Transfer Mode)
• DMS — Data Management System
• EMS — Element Management System (ATM)
• CO — Central Office
• CEV — Controlled Environment Vault
• STI — Speech Transmission Index
• IEEE-CS — Institute of Electrical and Electronics Engineers Computer Society
• OMS — Optical Multiplex Section
• TPC — The Phone Company
• AFSK — Audio Frequency Shift Keying

• RJ-14 — Registered Jack type 14 (2-wire connector)
• HDSL — High-bit-rate Digital Subscriber Line
• SMB — Server Message Block
• BNC — Bayonet Neill-Concelman
• ASE — Application Service Element
• FSK — Frequency-Shift Keying
• SBC — Session Border Controller
• NCSC — National Computer Security Center (NSA)
• RADIUS — Remote Authentication Dial-In User Service
• NAT — Network Address Translation
• RX — Receive
• CAC — Carrier Access Code
• OTS — Optical Transmission Section
• OSF — Open Software Foundation
• CAVE — Cellular Authentication and Voice Encryption Algorithm
• COMJAM — Communications Jamming
• DIS — Draft International Standard
• DRFM — Digital Radio-Frequency Memory
• ECAC — European Civil Aviation Conference
• MCP — Microsoft Certified Professional
• F — Fellow
• WLTF — Wireless LAN (Local Area Network) Task Force
• ECT — Explicit Call Transfer
• LSF — Line Spread Function
• DUA — Directory User Agent
• SVC — Switched Virtual Circuit (ATM)
• NSS — Network Switching Subsystem
• EBCDIC — Extended Binary-Coded Decimal Interchange Code
• EIGRP — Enhanced Interior Gateway Routing Protocol
• NRPB — National Radiological Protection Board
• TIFF — Tag Image File Format
• DII — Defense Information Infrastructure
• SAA — Systems Application Architecture
• DUC — Digital Up-Converter
• SNA — System Network Architecture
• CRO — Central Records Office
• TCPA — Telephone Consumer Protection Act
• VBA — Visual BASIC for Applications
• LT — Line Termination
• FITS — Flexible Image Transport System
• DN — Distinguished Name
• RPV — Remotely Piloted Vehicle
• NDVI — Normalized Difference Vegetation Index
• TDD — Telecommunications Device for the Deaf
• RJ-25 — Registered Jack type 25 (6-wire connector)
• 4GL — Fourth-Generation Language
• RP — Reference Point
• LRC — Learning Resource Center
• AAF — Advanced Authoring Format
• UTP — unshielded twisted pair

• 2W — Two Wire
• WWAN — wireless wide-area network
• SVD — Singular Value Decomposition
• LFACS — Loop Facility Assignment and Control System
• DNIC — Data Network Identification Code
• WAFB — Wireless Absolute Fairness Bound
• POP — Post Office Protocol
• HEX — Hexadecimal (base 16)
• CVD — Chemical Vapor Deposition
• ROSAT — Roentgen Satellite
• AAS — Adaptive Antenna System
• BELLCORE — Bell Communications Research, Inc.
• FE — Finite Element
• E2E — End-to-End
• TTL — ToS and Time-to-Live
• TXM — Transmission X-ray Microscope
• DMX — De-MultipleXer
• PEM — Privacy-Enhanced Mail
• CAMA — Centralized Automatic Message Accounting
• CO — Certificate of Origin
• IN — Intelligent Network
• SMPTE — Society of Motion Picture and Television Engineers, Inc.
• FAA — Federal Aviation Agency
• P — Predicted
• LEP — Large Electron Positron
• ASN.1 — Abstract Syntax Notation One
• IS — Information System
• STK — Satellite Tool Kit
• BAOC — Barring of All Outgoing Calls supplementary service
• IESG — Internet Engineering Steering Group
• SD — Software Development
• VHSIC — Very High-Speed Integrated Circuit
• ACF — Access Control Field
• STN — Station
• CCIR — International Radio Consultative Committee (French Acronym)
• GDS — Global Distribution System
• AML — Amplitude Modulated Link
• NLMS — Normalized Least Mean Square
• DSCP — Differentiated Services Code Point
• AAV — Accountholder Authentication Value
• PGA — Programmable Gate Array
• ECP — Encryption Control Protocol
• CODASYL — COnference on DAta SYstems Languages
• VPI — Virtual Path Identifier
• TDRSS — Tracking and Data Relay Satellite System
• CPN — Cisco Powered Network
• VT — Virtual Terminal
• SITA — Société Internationale de Télécommunications Aéronautiques
• TS — Technical Specification
• EFS — Encrypting File System

• IRTF — Internet Research Task Force
• FTAM — File Transfer Access and Management
• AFP — AppleTalk Filing Protocol
• DEMUX — Demultiplexer
• BTAM — Basic Telecommunications Access Method
• BOD — Bandwidth on Demand
• TRMM — Tropical Rainfall Measuring Mission (US-Japan)
• TLC — The Learning Channel
• SAN — System Area Network
• MSR — Microwave Scanning Radiometer
• CLNP — ConnectionLess-mode Network Protocol
• QI — Quality Indicator
• SA — Source Address
• CBP — Coded Block Pattern
• AUI — Attachment Unit Interface
• IRS — Inertial Reference System
• EST — Establish
• AMSS — Automatic Message Switching System
• TCR — Temperature Coefficient of Resistance
• EMI — Electro-Magnetic Interference
• AIN — Advanced Intelligent Network
• TDD — Time Division Duplex
• WAIS — Wide Area Information Server
• COPS — Common Open Policy Service
• IRLAN — Infrared LAN
• IDT — Integrated Digital Terminal
• KAK — Key-Auto-Key
• QDR — Quad Data Rate
• LU — Logical Unit
• LNP — Local Number Portability
• GDM — GSM (Global System for Mobile communications) Data Module
• NCAR — National Center for Atmospheric Research (US)
• RRN — Routing Recording Number
• RGN — Region
• E&M — ear and mouth (special signaling leads)
• RACH — Random Access Channel
• LQR — Linear Quadratic Regulator
• NII — National Information Infrastructure (USA)
• CTU — Central Terminal Unit
• BHCA — Busy Hour Call Attempt
• SDSL — Symmetric Digital Subscriber Line
• SUS — Suspension
• PM — Phase Modulation
• VESA — Video Electronics Standards Association
• NIU — Network Interface Unit
• NSAP — Network Service Access Point
• ADT — American District Telegraph Company
• UAN — Universal Access Number
• ASR — Access Service Request
• SPI — Service Provider Interface

• FH — Frequency Hopping
• WHT — Walsh-Hadamard Transform
• TOVS — TIROS Operational Vertical Sounder
• CC — Call Control
• OOP — Object-Oriented Programming
• NW — North West
• DW — Deep Water
• WWAN — Wireless Wide Area Network
• CODEC — Coder/decoder
• PAL — Programmable Array Logic
• BSI — British Standards Institution
• MSE — Mobile Subscriber Equipment
• MC — Message Center
• CSAT — Customer Satisfaction
• PVD — Physical Vapor Deposition
• SATAN — Security Administrator Tool for Analyzing Networks
• DER — Distinguished Encoding Rules
• MHO — My Humble Opinion
• DAL — Dedicated Access Line
• IEEE — Institute of Electrical and Electronics Engineers
• M — Management
• SPADATS — Space Detection And Tracking System
• LRC — Longitudinal Redundancy Check
• ETS — European Telecommunication Standard
• LATA — Local Access and Transport Area
• HEHO — Head End Hop Off
• FUP — Fair Use Policy
• FR PVC — Frame Relay Permanent Virtual Connection
• COMDEX — Computer Dealers Exposition
• FEXT — Far-End Cross Talk
• BIS — Business Information System
• BLER — Block Error Rate
• PUB — Publication (file name extension)
• VLAN — Virtual Local Area Network
• ISM — Industrial, Scientific and Medical
• TOMS — Total Ozone Mapping Spectrometer (satellite Instrument)
• PSD — Phase-Sensitive Detector
• ETSI — European Telecommunications Standard Institute
• FWA — Fixed Wireless Access
• 1FB — Single line, Flat Business rate;
• PTA — Pakistan Telecommunication Authority
• B2B — Business-to-Business
• LEN — Line Equipment Number
• DVB — Digital Video Broadcasting
• PUK — PIN (Personal Identification Number) Unlocking Key
• F — Frequency
• RISC — Reduced Instruction Set Computing
• CRLF — Carriage-Return Line-Feed
• PNP — Plug-and-Play
• AF — Assured Forwarding

• RDI — Remote Defect Indicator (UNI Fault Management)
• IPOATM — Internet Protocol over ATM
• CAPS — Call Attempts Per Second
• AUD — Audit
• SDP — Software Development Plan
• SLIP — Serial Line Internet Protocol
• ITP — Interactive Telecommunications Program
• TBD — To Be Decided
• FEP — Front-End Processor
• BMEWS — Ballistic Missile Early Warning System (bee-mews)
• MD — Mediation Device
• ESP — Encapsulating Security Payload
• LSI — Large Scale Integration -> VLSI
• LPD — Low Probability of Detection
• IAD — Integrated Access Device
• NAS — Network-Attached Storage
• ASA — Acoustical Society of America
• SDHLR — Super-Distributed Home Location Register
• DPSK — Differential Phase Shift Keying
• LDP — Label Distribution Protocol
• ESF — Edge Spread Function
• TCP/IP — Transmission Control/Internet Protocol
• FDD — Frequency Division Duplex
• SIP — Session Initiation Protocol
• MTP — Message Transfer Part
• Y — Yttrium
• SINAD — SIgnal-to-(Noise And Distortion) ratio
• RAU — Radio Access Unit (Army)
• PSN — Packet Switched Network
• ASARS — Advanced Synthetic Aperture Radar System
• DCN — Disconnect
• CT — Computer Telephony
• RSS — root-sum-square
• IPCP — Internet Protocol Control Protocol
• BCH — Binary Coded Hexadecimal
• CMOS — Complementary Metal Oxide Semiconductors
• SWBD — Switchboard
• 4 GIG — 4 Giga Intellectual Gadget
• ASAR — Advanced Synthetic Aperture Radar 
• ASYNC — Asynchronous
• Y — Yes
• SPD — Serial Presence Detect
• DCP — Design Change Package
• MLP — Mobile Location Protocol
• T — Temperature
• CSPDN — Circuit Switched Public Data Network
• PIC — Programmable Interrupt Controller
• CFNRY — Call Forwarding on No Reply
• IPR — Intellectual Property Right
• GSM — Groupe Speciale Mobile

• TI — Time Interval
• ACSE — Association Control Service Element
• B6ZS — Bipolar 6 Zero Substitution
• BY — Busy
• CAM — Computer-Aided Manufacturing
• MX — Mixer
• IP — Intelligent Peripheral
• ACLR — Adjacent Channel Leakage Ratio
• ARC — Army Reuse Center
• BDE — Borland Database Engine
• NCC — Network Control Center (GSFC)
• ESCA — photoelectron spectroscopy for chemical analysis
• EAS — Extended Area Service
• DMARC — Demarcation point
• FSK — Frequency Shift Keying
• REA — Rural Electrification Administration (US)
• NPA — Numbering Plan Area
• PIC — Peripheral Interface Controller
• HW — Hardware Wars
• MUSIC — MUltiple SIgnal Classification
• ACT — Activity
• TN — Telephone Number
• VQV — Voice Quality Value
• BAN — Billing Account Number
• YA — Yet Another
• UMA — Unlicensed Mobile Access
• IPLC — International Private Leased Circuit
• FLM — First Line Maintenance
• CLEC — Competitive Local Exchange Carrier
• ODS — Operational Data Store (knowledge management)
• VTS — Vessel Traffic Service
• MPI — Message Passing Interface
• DTU — Data Transfer Unit
• NES — Network Encryption System
• TDR — Time-Domain Reflectometry
• FEM — Finite Element Method
• SLAM — Scanning Laser Acoustic Microscope
• SML — Service Management Layer
• SPA — Software Publishers Association
• DMI — Desktop Management Interface (computing)
• ACF — Advanced Communications Function (IBM)
• GMRS — General Mobile Radio Service
• STP — Signal Transfer Point
• SCP — Service Control Point
• EIP — Equipment installation procedure
• ATC — Advanced Technology Center
• FECN — Forward Explicit Congestion Notification (ATM)
• CD — Critical Dimension
• W-CDMA — Wideband Code Division Multiple Access
• EFIS — Electronic Flight Information System

• VCI — Virtual Channel Identifier
• DID — Digital Information Display
• UART — Universal Asynchronous Receiver/Transmitter
• TTY — teletype terminal
• DCS — Digital Cross-Connect
• YYP — Yahoo Yellow Pages
• DTMF — Dual-Tone MultiFrequency
• CMIP — Common Management Information Protocol (ATM)
• AMPS — Advanced Mobile Phone Service (cellular phone standard)
• PU — Physical Unit (IBM)
• FOSE — Federal Office Systems Exposition
• SWAP — Shared Wireless Access Protocol
• TMSI — Temporary Mobile Subscriber Identity
• LAG — Link Aggregation Group
• CP — Change Proposal
• LSW — Least Significant Word
• TOS — Temporarily Out of Service
• TM — Thematic Mapper (Landsat)
• IMAP — Internet Mail Access Protocol
• LIS — Lightning Imaging Sensor
• FA — Functional Area
• CSU — Channel Service Unit
• DISN — Defense Information Systems Network
• RJE — Remote Job Entry
• MMC — Microsoft Management Console (Microsoft)
• SFX — Special Effects
• SCPC — single channel per carrier
• VOP — Voice Over Packet
• STN — Station Casinos, Inc.
• DCS — Defense Communications System
• COAM — Customer Owned And Maintained
• OBC — Onboard Computer
• TOP — technical/office protocol
• FDTD — Finite Difference Time Domain
• FIOS — Fiber Optic Services
• CIRC — Cross-Interleaved Reed-Solomon Code
• BIP — Band Interleaved by Pixel
• SVC — Switched Virtual Connection
• 1-ESS — x-ESS series of Electronic Switching Systems
• AC — Area Code
• CLDC — Connected Limited Device Configuration
• DIV — Divisionsion
• RDBMS — Relational Data Base Management System (Oracle)
• RMON — Remote Monitoring
• FAS — Frame Alignment Signal
• CES — Circuit Emulation Service
• XPS — X-Ray Photoelectron Spectroscopy
• TL1 — Transaction Language 1
• CSPRM — Common Signaling Protocols Resource Module
• MEAS — Measure

• CHTML — Compact Hypertext Markup Language
• DLCI — data link connection identifier
• WSDL — Web Services Description Language
• RIPE NCC — Reseaux IP Europeens Network Coordination Centre
• DL — Downlink Message
• GTP — GPRS (General Packet Radio Service) Tunneling Protocol
• RADINT — Radar Intelligence
• FE — Far End
• STM — Scanning Tunneling Microscopy
• HFC — Hybrid Fiber Coaxial
• SZ — Seizure
• MSC — Mobile Switching Center
• PAM — Payload Assist Module
• SG — Signaling Gateway (IETF)
• OT — Office of Telecommunications
• DAC — Digital-To-Analog Converter
• 2G — Second Generation Wireless Systems
• CIP — Continuous Improvement Program
• CMT — Cadmium Mercury Telluride
• TE — Test Equipment
• NAK — Negative Acknowledge
• RECON — Reconnaissance
• LAAS — Local Area Augmentation System
• CI — Common Interface
• LCR — Least Cost Routing
• TRM — Technical Reference Model
• TELECOMMUTE — Telecommuting
• EIR — Excess Information Rate
• A — Anode
• 4W — Four-Wire
• PWM — Pulse width modulation
• DVP — Digital Voice Privacy
• PG — Page
• DUV — Deep Ultraviolet
• DAS — Data Acquisition System
• WARC — World Administrative Radio Conference
• DS-0 — Digital Signal, Level 0
• NIC — Network Interface Controller
• AN — Access Node
• FRAD — Frame Relay Access Device
• AAS — advanced automation system (FAA)
• ERL — Echo Return Loss
• NT — New Technology, also Windows NT
• RLU — Remote Line Unit
• KSU — Key Service Unit
• SIMT — Système interbancaire marocain de télécompensation
• IPS — InPlane Switching
• MP — Multilink Protocol
• PP — Polypropylene
• MEID — Mobile Equipment Identifier

• MSI — Maritime Safety Information
• TC — Transmission Convergence (ATM)
• CAM — Content Addressable Memory
• ACC — Area Control Center
• NDIS — Network Driver Interface Specification (Microsoft Windows NT)
• ESN — Electronic Serial Number
• NLM — NetWare Loadable Module
• CPE — Customer Premise Equipment
• CDR — Clock and Data Recovery
• S/N — Signal-to-Noise ratio
• OPC — Originating Point Code
• CLETS — California Law Enforcement Telecommunication System
• PTT — Push to Talk Testing
• PDS — Planetary Data System
• NTDS — Naval Tactical Data System
• SPM — Scanning Probe Microscope
• IEC — Interexchange Carrier
• TACACS — Terminal Access Controller Access Control System
• TSO — Telecommunications Service Order
• 4G — Fourth Generation Wireless Systems
• SSMA — Spread-Spectrum Multiple Access
• DEM — Digital Elevation Model
• IWF — Interworking Function
• RT — Remote Terminal
• ROW — Rest Of World
• CER — Cell Error Ratio
• SCN — Switched Circuit Network
• CNM — Customer Network Management
• DPCM — differential pulse code modulation
• PRI — Priority
• UMTS — Universal Mobile Telecommunication System
• PBT — Polybutylene Terephthalate
• DCS — Digital Cellular System
• JAN — Joint Army-Navy
• BTC — Botswana Telecommunications Corporation
• TCIC — Trunk Circuit Identification Code
• TELNET — Telecommunications Network Protocol
• SM OFC — Single-Mode Optical Fiber Cable
• SSAP — Source Service Access Point
• BUFR — Binary Universal Form for the Representation (of data)
• GI — Graded-Index
• CGI — Cell Global Identity
• NTU — Network Termination Unit
• SIL — Solid Immersion Lens
• HTML — Hyper-Text Markup Language
• BCH — Bose-Chaudhuri-Hocquenghem Coding
• ESPN — Entertainment and Sports Programming Network
• MTA — Message Transfer Agents (Internet)
• FTNS — Fixed Telecommunications Network Services
• WPS — Wireless Priority Service

• EMEA — Europe, Middle East and Africa
• ES — Emergency Service
• CNG — Fax Calling Tone
• NNM — Network Node Manager
• BCDIC — Binary Coded Decimal Interchange Code
• SRR — Search and Rescue Region
• PDT — Portable Data Terminal
• TCM — Trellis-Coded Modulation
• RSS — Radio Service Software (Motorola)
• ER — Extended Range
• DLP — Data Link Processor
• UPT — Universal Personal Telecommunications
• STU — Secure Telephone Unit
• EBS — Electron Bombarded Silicon
• PARC — Palo Alto Research Center
• RA — Risk Analysis
• SIM — Subscriber Identity Module
• DICOM — Digital Imaging and Communications in Medicine
• DMT — Discrete Multi-Tone Technology
• TRS — Trunked Radio Systems
• IPS — Instructions Per Second
• TSR — Telecommunications Service Request
• RMS — Resource Management System
• DPL — Digital Power Line
• FCA — Free Carrier Alongside
• NCP — Network Control Program
• CDDI — Copper Distributed Data Interface
• CDC — Connected Device Configuration
• URN — Uniform Resource Namespace
• CAR — committed access rate
• DL — Data Link
• DPL — Digital Private-Line
• RLS — Recursive Least Squares
• DL — Digital Library
• AFI — Authority and Format Identifier
• LT — Less Than
• ADN — Abbreviated Dialing Number
• L2TPV3 — Layer 2 Tunneling Protocol Version 3
• OTDOA — Observed Time Difference of Arrival
• SEM — Scanning Electron Microscopes
• ATS — Air Traffic Services
• MOL — Manned Orbiting Laboratory
• WSFL — Web Services Flow Language
• STM — Synchronous Transfer Mode
• RCC — Radio Common Carrier
• NEMP — Nuclear Electromagnetic Pulse
• METRO — Metropolitan
• MBWA — Mobile Broadband Wireless Access
• MTD — Moving Target Detection
• EA — Extended Address Field Bit

• CIAC — Computer Incident Advisory Capability
• PSN — Public Switched Network
• DPDU — Data Protocol Data Unit
• SPE — Synchronous Payload Envelope
• CNG — comfort noise generation
• NWK — Network
• PUC — Public Utility Commission (electricity)
• CCNA — Cisco Certified Network Administrator
• TLK — Talk
• DEC — Decimal
• IAT — Integrated Access Terminal
• VSAM — Virtual Storage Access Method
• E — Electra
• HSPA — High Speed Packet Access
• UBR — Unspecified Bit Rate
• SR — Slow Release
• WAAS — Wide Area Augmentation System
• TTY — Text Teletype
• SL — Single Line
• MRT — Medical Response Team
• AMA — automatic message accounting
• B3G — Beyond Third Generation
• SISIR — Singapore Institute of Standards and Industrial Research
• DOCSIS — Data over Cable Service Interface Specification
• RDMA — Remote Direct Memory Access
• 2G — Second generation cellular
• FEA — Finite Element Analysis
• CALEA — Communications Assistance for Law Enforcement Act
• ABM — Asynchronous Balanced Mode
• VLSI — Very Large-Scale Integration
• FITL — Fiber-In-The-Loop
• BBM — Blackberry Messenger
• ARSR — Air Route Surveillance Radar
• HFC — Hybrid Fiber/Coaxial network
• MGC — Multimedia Gateway Controller
• SAI — Serving Area Interface
• LMDS — Local Multipoint Distribution Service
• SSM — Synchronization Status Message
• ST — Such That
• PE — Probable Error
• OWS — Operator Work Station
• VC — Virtual Circuit (ATM)
• SA — Selective Availability (on GPS transmissions)
• DA — deca
• ARPANET — ARPA Network
• IDF — Independent Distribution Frame
• CPC — Calling Party Control
• MSW — Most Significant Word
• RSN — Regional Service Network
• DGPT — Directorate General of Posts and Telecommunications

• EU — End User
• PTT — Push to Talk Technology
• CB — Common Battery
• TD-CDMA — Time Division - Code Division Multiple Access
• VTAM — Virtual Telecommunication Access Method
• CMRS — Commercial Mobile Radio Service
• SEC — Software Engineering Center
• PTO — U.S. Patent And Trademark Office
• CSIRO — Commonwealth Scientific and Industrial Research Organization
• CQA — Certified Quality Auditor
• PHY — Physical Layer
• ASDE — Airport Surface Detection Equipment
• PS — Product Specification
• NTE — Network Terminating Equipment
• C — Cost
• ADPCM — Adaptive Differential Pulse Code Modulation
• CGA — Color Graphics Adapter
• DL — Definition List
• L2TP — Layer 2 Tunneling Protocol
• CP — Cell Phone
• MTI — Moving Target Indicator
• PTP — Point To point Protocol
• RADIUS — Remote Authentication dial In User Service
• RADARSAT — Radar Satellite
• MOD — Modify
• TBPS — Terabits Per Second
• FTTC — Fiber To The Curb光纤到路边
• RT — Response Time
• PTT — Push to Talk Taster
• VAN — Value-Added Network
• BSID — Base Station Identity
• NDS — Novell Directory Services
• OSP — Outside Plant
• LUNT — Line Unit Network Termination
• ASN.1 — Abstract Syntax Notation 1
• MILNET — Military Network
• EPP — Enhanced Parallel Port (PC)
• Q — Quadrature
• CAAS — Communications-as-a-Service
• CTI — Computer Telephony Integration
• ATSC — Advanced Television Systems Committee
• MAP — Mobile Application Part
• EIR — Equipment Identity Register
• SPX — Sequenced Packet Exchange
• DDLD — Direct Dial Long Distance
• APDU — Application Protocol Data Units
• LSAP — Link Service Access Point
• ECS — Environmental Control System (Subsystem)
• CVR — Crystal Video Receiver
• AIF — Audio Interchange Format

• 2W — 2-Wire
• NTSC — National Television Standards Committee
• ANC — Access Network Controller
• CCITT — Comit? Consultatif International T?l?graphique et T?l?phonique
• UAT — Universal Access Transceiver
• PCS — Personal Communications Services
• SM — Service Module
• STD — Secondary Telecom District
• TC — Technical Committee (HL7)
• DC — Display Controller
• 3-D — 3-Dimensional
• FIRST — Forum of Incident Response and Security Teams (CERT)
• FHSS — Frequency Hopping Spread Spectrum
• MFLOPS — Millions of Floating Point Operations per Second
• ECM — Error Correction Model
• MDM — Mobile Device Management
• TUR — Trunk Utilization Report
• TSP — Telecommunications Service Priority
• ATA — Analog Telephone Adapter
• ARCNET — Attached Resource Computer Network
• ENV — Environment
• NRP — Network Resource Planning
• BWD — backward
• MBE — Molecular Beam Epitaxy
• MSDP — Multicast Source Discovery Protocol
• BSS — Base Station Subsystem
• PLL — Phase Locked Loop
• VT — Vacuum Tube
• SFN — Single Frequency Network
• MIDP — Mobile Information Device Profile
• MNP — Mobile Number Portability
• SSRC — Synchronization Source
• CSC — Common Signaling Channel
• SCO — Synchronous Connection Oriented
• IOC — Inter-Office Channel
• PVC — Permanent Virtual Connection
• VPWS — Virtual Private Wire Service
• GDK — GIMP (GNU Image Manipulation Program) Drawing Kit
• O/S — Operating System
• L2F — Layer 2 Forwarding protocol
• DNU — Do Not Use
• CGA — Carrier Group Alarm
• PSK — Phase Shift Key
• VPA — Valid Peripheral Address
• CSAR — Combat Search and Rescue
• LBR — Low Bit Rate
• VOA — Voice Of America
• SIL — Silence
• DCA — Dynamic Channel Assignment
• FRS — Frame Relay Service

• PNP — Positive-Negative-Positive
• BUS — Broadcast and Unknown Server
• PMP — Project Management Professional
• MV — Motion Vector
• LANE — Local Area Network Emulation
• MAG — Mobile Access Gateway
• MITI — Ministry of International Trade and Industry
• BSS — Basic Service Set
• FEBE — Far End Block Error (SONET)
• DBRNC — deciBel Relative to Noise in a Circuit
• JISC — Japanese Industrial Standards Committee
• DUV — Data-Under-Voice
• DACS — Digital Access Cross-connect System
• DFG — difference-frequency generation
• TDWR — Terminal Doppler Weather Radar
• AIT — Automatic Identification Technology
• DII — Dynamic Invocation Interface
• VISSR — visible and infrared spin scan radiometer (GOES)
• LN — Line
• DF — Direction Finding or Finder
• 3G HSPA — Third-Generation High-Speed Packet Access
• NMC — Network Management Center
• DDL — Digital Data Link
• SCR — Sustainable Cell Rate
• UP — User Profile
• FMS — Fraud Management System
• MBMS — Multimedia Broadcast/Multicast Service
• SE — Southeast
• CLI — Calling Line Identification
• ANS — Advanced Network Services
• SMR — Specialized Mobile Radio
• IS 41 — Interim Standard 41 (Inter-Cellular Network Communication Protocol)
• ALT — Accelerated Life Test
• C — Collector
• QOI — Quality of Information
• MAU — Multistation Access Unit
• M/W — MicroWave
• B8ZS — Binary Eight Zero Substitution
• SS1 — Signalling System 1 (500/20 Hz tones)
• PIM — Protocol Independent Multicast
• FDL — Facility Data Link
• DMS — Defense Messaging System
• SAR — Segmentation and Reassembly (ATM)
• FTS — Federal Telecommunications System
• ARD — Automatic Ring Down
• DXI — Data Exchange Interface
• ARM — Asynchronous Response Mode
• FCFS — First-Come, First-Served
• PCI — Personal Computer Interface
• GBT — Ground Based Tower

• DPNSS — Digital Private Network Signaling System
• CS — Convergence Sublayer (ATM)
• AM — Activity Manager
• CASE — Computer-Aided Software Engineering
• SF — Single Frequency
• CCLC — Carrier Common Line Charge
• OLS — Optical Line System
• TAD — Telephone Answering Device
• ATCA — Advanced Telecom Computing Architecture
• LD — Laser Diode
• IRF — Impulse Response Function
• EV — electronvolt
• SDNS — Secure Data Network System
• BS — Broadcast Satellite
• ETN — Electronic Tandem Network
• SCCP — Signalling Connection Control Part
• IRC — International Record Carrier
• TOU — Time of use (rate) (electricity)
• BHCA — Busy Hour Call Attempts
• USRT — Universal Synchronous Receiver/Transmitter
• ATRAC — Adaptive Transform Acoustic Coding
• CCR — Customer Controlled Reconfiguration (Sprint)
• CONUS — Contiguous United States
• PSNEXT — Power Sum Near End Cross Talk
• XC — Cross-Connect
• IPRC — Intellectual Property Rights Committee
• CALS — Computer Aided Acquisition and Logistic Support
• EM — Electromigration
• WTP — Wireless Transaction Protocol
• MC/MIC — Mode Common/Mode Indicate Common
• CAP — Capability
• FOIP — Fax Over Internet Protocol
• CACM — Communications of the ACM
• DHD — Dial Home Device
• RM-ODP — Reference Model for Open Distributed Processing
• HDTV — High-Definition Television
• TLT — Test Loop Translator
• CGSA — Cellular Geographic Service Area
• BSA — Basic Service Area
• ISG — Information Systems Group
• O — objective
• MPI — Minimum Picture Interval
• FRS — Family Radio Service
• STD — Subscriber Trunk Dialing
• AS — Access System
• BCS — British Computer Society
• SCM — Single-Carrier Modulation
• SCH — Synchronization Channel
• KTS — Key Telephone System
• E — Echo

• BIND — Berkeley Internet Name Domain
• LSI — Large-Scale Integration
• ALB — Analog Loopback
• COT — Central Office Terminal
• GFC — Generic Flow Control (ATM)
• 3GSM — Third-generation Global System for Mobile (communications)
• RLC — Radio Link Control
• FEAT — Feature
• BMS — Business Management System
• LCGN — Logical Channel Group Number
• SB — Switchboard
• DOR — Detailed Outage Report
• AECT — Association for Educational Communications and Technology's
• SDU — Signal Distribution Unit
• COO — Cell of Origin
• XRF — X-Ray Fluorescence
• RDT — Remote Digital Terminal
• 3G — 3rd Generation Wireless Format
• SRM — Scalable Reliable Multicast
• ACP — Access Control Point
• WRED — Weighted Random Early Detection
• SYSADM — System Administrator
• CIS — Computer and Information Science
• S/D — Source/Drain
• DQDB — Distributed Queue Dual Bus
• LASINT — Laser Intelligence
• CRB — Cramer-Rao Bound
• # — Number sign, octothorp; special function key
• REPT — Report
• CS-PDU — Convergence Sublayer - Protocol Data Unit
• SSM — Spread Spectrum Modulation
• ANSI-41 — ANSI standard for mobile management
• DFE — Design For Environment
• ADC — Administration Center
• BSS — Base Station System
• BABT — British Approvals Board for Telecommunications
• VPX — Virtual Path Cross-Connect
• DTN — Data Transfer Network
• AVR — Automated Voice Response
• BS — Backing Store
• MAI — Multiple Access Interference
• A/C — Air Conditioner
• DE — Discard Eligibility (ATM)
• WSP — Wireless Session Protocol
• SRL — Singing Return Loss
• PC — Peripheral Controller
• PY — person-year
• SPIN — Service Provider Identification Number
• CDV — Cell Delay Variation(ATM)
• NETBIOS — Network Basic Input-Output System

• DAC — Digital to Analog Converter-Audio
• DUN — Dial-Up Networking
• INMS — Integrated Network Management System
• CLK — Clock
• TEI — Terminal Endpoint Identifier
• DM — Domain Model
• CDV — Compressed Digital Video
• RDS — Rate Determining Step
• EGSM — Extended Global System for Mobile Communications
• DMT — Discrete Multi-tone Transmission
• VAD — Voice Activity Detection
• IT — Integration Test
• LOO — Likelihood of Occurrence
• MTS — Message Transfer System
• BT — Bluetooth Tablet
• NAU — Network Addressable Unit
• SMS — System Management Server
• WVPN — Wireless Virtual Private Network
• TMS — Time Management System
• DMI — Distributed Management Interface
• MLM — Multi-Longitudinal Mode
• SAF — System Access Fee
• UNI — User-Network Interface
• IPM — Inches Per Minute
• BAN — Building Area Network
• OST — Office of Science and Technology
• TRS — Telecommunications Relay Service
• DSSSL — Document Style Semantics and Specification Language
• GSTN — General Switched Telephone Network
• OSA — Open System Architecture
• CB — Citizens' Band
• CPC — Continous Packet Compression
• GRX — GPRS Roaming Exchange
• MOS — Metal Oxide Semiconductor (FET Devices)
• FAT — Final Acceptance Testing
• EVA — Electronic Video Agent
• DDD — Direct Distance Dialing
• ZD — Zero Defects
• OODBMS — Object-Oriented Database Management Systems
• EBIC — Electron Beam Induced Current
• TEL & TEL — TELephone and TELegraph
• CGI — Computer Graphics Interface
• FGD — Feature Group D
• ZCZ — Zero Correlation Zone
• OXCO — Oven-Controlled Crystal Oscillator
• SAS — Special Access Surcharge
• SMT — station management (protocol)
• FAW — Frame Alignment Word
• OSCAR — Orbiting Satellite Carrying Amateur Radio
• GERAN — GSM (Global System for Mobile communications) Edge Radio Access Network

• PT — Payload Type (ATM)
• X — X Window System
• FIFO — first-in, first-out
• OOK — On/Off Keying
• * — Star, special function key
• BSC — Base Station Controller
• ACE — Adaptive Communication Environment
• HEC — Header Error Control
• PLCP — Physical Layer Convergence Protocol (ATM)
• TOC — Telecommunication Operations Center
• SQ — Service Quality
• BOSS — Binary Object Storage System
• CERN — Conseil Europeen Pour La Recherche Nucleaire
• PLCP — Physical Layer Convergence Procedure
• VNL — Via Net Loss
• WIS — WAN (Wide Area Network) Interface Sublayer
• NAM — Number Assignment Module
• CCSA — Common Control Switching Arrangement
• LSP — Label Switched Path
• DAS — Distributed Antenna System
• LASA — Large Aperture Seismic Array
• SETI — Search for Extraterrestrial Intelligence
• ILEC — Incumbent Local Exchange Carrier
• DARTS — Design Approach for Real-Time Systems
• P — Priority
• DMT — Discrete Multi-Tone
• IG — Interface Group
• DXC — Digital Cross Connect
• 3GPP — Third-Generation Partnership Project
• BAP — Bandwidth Allocation Protocol
• BONDING — Bandwidth On Demand Interoperability Group
• TACSAT — Tactical Satellite
• AAL5 — ATM (Asynchronous Transmission Mode) Adaptation Layer 5
• BIOS — Basic Input-Output System
• SIA — Securities Industry Association
• EMR — Electromechanical Relay
• STA — Science and Technology Agency (Japan)
• LP — Line Pair
• ETF — Early Termination Fee
• CAS — Column Address Strobe
• TSB — Telecommunication Standardization Bureau
• SASL — Simple Authentication and Security Layer
• HUACA — Hang Up And Call Again
• WDN — Wireless Developer Network
• WNMS — Wireless Network Management System
• Z — Zulu Time
• CND — Calling Number Display
• VG — Voice Grade
• MGCP — Multimedia Gateway Control Protocol
• DSU — Digital Service Unit

• NAP — Network Access Point
• AWT — Agence Wallonne des Télécommunications
• ECTF — Enterprise Computer Telephony Forum
• TSE — Toronto Stock Exchange
• SAT — Satellite
• EFCI — Explicit Forward Congestion Indication (ATM)
• EST — Electroshock Therapy
• SMMR — Scanning Multichannel Microwave Radiometer
• PSS — Performance Support System
• CS — Central Station
• N-AMPS — Narrowband Advanced Mobile Phone System
• RS-422 — Recommended Standard 422 (ANSI/EIA standard for transmitting serial data)
• ISI — Intersymbol Interference
• NA — Network Adapter
• IXC — interexchange carrier
• PMT — Photo Multiplier Tube
• RSL — Restricted Service License
• DDU — Disk Drive Unit
• OML — Object Model Library
• PSO — Professional Services Organization
• MLA — Modern Language Association
• PTM — Packet Transport Mode
• ADC — Access Deficit Charge
• F/W — Firmware
• V — Variable
• CPG — Converged Packet Gateway
• SH — Shell
• DCF — Distributed Coordination Function
• 4WA — Four Wire Analog
• GTB — Global Telecom Brokers
• ETOC — Electronic Table of Contents
• ACU — Automatic Calling Unit
• HUP — Hook-UP
• RNR — Receive Not Ready
• UMTS — Universal Mobile Telecommunications Standard
• BCST — Broadcast
• ARPT — Autorité de Régulation des Postes et Télécommunications
• ATD — Advanced Technology Demonstration
• FTTP — Fiber To The Premises
• SD — Speed Dial
• WDA — Wireless Digital Assistant
• MO — Magneto-optic
• EDFA — Erbium-Doped Fiber Amplifier
• ELFEXT — Equal-Level Far-End Cross-Talk
• A/D — Analog-to-Digital converter
• LIM — Line Isolation Monitor
• DNC — Do Not Call
• DMT — Digital-Discrete Multi-Tone
• FOC — Fiber-Optic Cable
• WAYP — White and Yellow Pages

• ADM — Administration, Office of
• UTL — Utility
• FTTK — Fibre To The Kerb
• DCMES — Dublin Core Metadata Element Set
• DSI — Digital Speech Interpolation
• SPID — Service Profile Identifier
• SLBM — Submarine-launched ballistic missile
• COM — Comedy Central
• MR — Mobile Router
• TX — Transmit
• NC — Network Computer (PC Internet)
• INE — Intelligent Network Element
• TAM — Telephone Answering Machine
• USF — Universal Service Fund
• COMB — Combined
• CAMEL — Customized Applications for Mobile-network Enhanced Logic
• LFTYR — Ley Federal de Telecomunicaciones y Radiodifusión
• QSTN — Question
• SLIC — Subscriber Line Interface Circuit
• CBQ — Class-Based Queuing
• MMM — Mobile Media Mode
• DXF — Data Exchange Format
• NHRP — Next Hop Resolution Protocol (ATM)
• RXQUAL — Received Signal Quality
• SR — Service Request
• LOP-P — Loss Of Pointer - Path
• OS/2 — Operating System/2
• RS — Receive Signature
• KSPS — KiloSymbols Per Second
• DTI — Digital Trunk Interface
• CCA — Carrier-Controlled Approach
• SS7 — Signaling System 7
• TBCD — Telephony Binary Coded Decimal
• VCT — Variable Cam Timing
• BIC — Bus Interface Controller
• LCAS — Link Capacity Adjustment Scheme
• PDL — Positioning Data Link
• DM — Differential Mode
• LORAN — Long Range Aid to Navigation System
• ALI — Automatic Location Information
• SLV — Satellite-Launch Vehicle
• NRZ — Nonreturn To Zero
• SCCS — Switching Control Center System
• 802.11 HR — High data Rate IEEE 802.11 Wireless LAN protocol
• TDM — Time Division Multiplexing
• FGA — Feature Group A
• EDSX — Electronic Digital Signal Cross-Connect
• AAV — Alternate Access Vendor
• BA — Behaviour Aggregate
• ECDIS — Electronic Chart Display Information System

• CEPT — Conférence Européenne des Administrations des Postes et des Télécommunications
• CFR-47 — Code of Federal Regulations Title 47 (FCC)
• BOA — Basic Object Adapter
• RAU — Remote Access Unit
• SSU — Stratospheric Sounding Unit (TOVS)
• SNIX — Single Noise Interference Xterminator
• LSC — Link State Control
• CSR — Customer Service Request
• BRAN — Broadband Radio Access Network
• IMP — Interface Message Processor
• CCR — Current Cell Rate (ATMF)
• CAM — Common Access Method
• TDRS — Tracking and Data Relay Satellites
• GOSIP — Government Open Systems Interconnection Profile
• CIP — Carrier Identification Parameter
• EMF — Event Management Framework
• DAP — Distributed Array Processor
• SDN — Software Defined Network
• CBWFQ — Class Based Weighted Fair Queueing
• FRF-LMI — Frame Relay Forum - Local Management Interface
• CP — Call Processing
• DLU — Digital Line Unit
• NIMH — Nickel-Metal Hydride
• IMPI — IP (Internet Protocol) Multimedia Private Identity
• WSA — Wireless Security Auditor
• ISSI — Inter-Switching System Interface
• SN — Service Number
• LDN — Local Directory Number
• TAX — Trunk Automatic Exchange
• DNI — Data Network Interface
• JSC — Joint Scientific Committee (ICSU, WCRP, and WMO)
• ALOC — Average Length Of Call
• 100VG — 100 Voice Grade (IEEE 802.12 AnyLAN Standard)
• ASAS — All-Source Analysis System
• TON — IEEE/ACM Transactions On Networking
• CT — Computer Terminal
• SIM — Subscriber Identification Module
• CU — Cooling Unit
• WFA — Wait for Answer
• WSP — Wireless Service Provider
• SMSC — Short Message Service Center
• DLT — Delete
• SAPI — Service Access Point Identifier
• UCM — Use Case Map
• VPC — Virtual Path Connection (ATM)
• BORSCHT — Battery feed, Overvoltage protection, Ringing, Signaling, Coding, Hybrid, and Testing
• AWS — Advanced Wireless Services
• AIS-L — Alarm Indication Signal - Line
• TP-PMD — Twisted Pair Physical Medium Dependent
• TU — Transmission Unit

• RICK — Repeater Interface Communications Kit
• BNCC — Base Network Control Center
• 3GIP — Third Generation Internet Protocol
• CIC — Carrier Identification Code
• RWIN — Receive Window
• LRQ — Location Request
• PMOS — P-channel Metal Oxide Semiconductor
• GMSS — Global Mobile Satellite System
• ADCCP — Advanced Data Communication Control Procedures
• CLP — Cell Loss Priority (ATM)
• SYNC — Synchronization
• MNOS — Metal-nitride-oxide Semiconductor
• CACH — Call Appearance Call Handling
• REG — range extender with gain
• VLR — Visitor Location Register
• ADPC — Automatic Data Processing Center
• SCCP — Signaling Connection Control Point
• KEK — Key Encrypting Key
• FDOA — Frequency Difference Of Arrival
• BTN — Billing Telephone Number
• DPT — Dynamic Packet Transport
• LIF — Logical Interchange Format
• TCS — Telephony Control Specification
• LB — Local Battery
• RTC — Real-Time Control
• FOD — Fax on Demand
• GSM-R — Global System for Mobile (communications) – Rail
• FAC — Forced Authorization Code
• AWG — arrayed waveguide grating
• BATM — Basic Telecommunication Access Method
• TCAM — Telecommunications Access Method
• SCU — System Control Unit
• MDN — Mobile Directory Number
• FGDC — Federal Geographic Data Committee's
• ATU-C — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Central office end
• DDI — Direct Dialing Incoming
• FXS — Foreign Exchange Subscriber
• AP — Action Point
• TSG — Telephone Security Group
• GAN — Global Area Network
• CTE — Computer Telephony Engineer
• PTCL — Pakistan Telecommunication Company Ltd
• GOSIP — Government Open System Interconnection Profile
• LBS — Location-Based Services
• FDI — Feeder Distribution Interface
• FB — Fine Business
• BDSL — Broadband Digital Subscriber Line
• CPH — Call Party Handling
• SN — Stock Number
• ICL — Inserted Connection Loss

• DLL — Digital Local Line
• CYTA — Cyprus Telecommunications Authority
• DTE — Digital Terminal Equipment
• ADM 3X — DS3 Add-Drop Multiplex
• EDC — Electronic Dispersion Compensator
• DNA — Digital Network Architecture
• FPLMTS — Future Public Land Mobile Telecommunications System
• UNI — User Network Interface
• LH — Link Handler
• CIP — Channel Interface Processor
• WBMP — Wireless Bitmap
• P2P — Person-to-Person
• UTRAN — UMTS (Universal Mobile Telecommunication System) Terrestrial Radio Access Network
• IDCP — Internet Device Control Protocol
• EKTS — Electronic Key Telephone Set
• CMIS — Common Management Information Service
• AQP — Association for Quality and Participation
• VN — Virtual Network
• CDPD — Cellular Digital Packet Data
• ILETS — International Law Enforcement Telecommunications Seminar
• MIN — Mobile Identification Number
• RPCU — Radio Port Control Unit
• CTIA — Cellular Telecommunications Industry Association
• FNN — Full National Number
• CV — Coding Violation
• NSE — Network Software Environment
• RNX — Restricted Numeric eXchange
• EC-N — Electrical Carrier (n=a number, e.g., EC-4)
• CDM — Conceptual Data Model
• BCSM — Basic Call State Model
• AAL — ATM (Asynchronous Transmission Mode) Adaptive Layer
• EF&I — Engineering, Furnishing and Installation
• TRIG — Trigger
• CLCC — Ceramic Leaded Chip Carrier
• EECM — End-to-End Call Manager
• TAPI — Telephony Application Programming Interface
• DCAS — Downloadable Conditional Access System
• TRX — Tandem Repeater eXchange
• CCCH — Common Control Channel
• WTS — Wireless Telecommunications Symposium
• TCAP — Transaction Capabilities Application Part
• MERIS — medium-resolution imaging spectrometer
• CON — Concentrator
• NF — Noise Factor
• PACS — Personal Access Communications System
• PMMA — Polymethyl Methacrylate
• SOH — Section Overhead
• LDM — Limited Distance Modem
• WAE — Wireless Application Environment
• DOV — Data-Over-Voice

• UNO — Universal Network Operations
• WFT — Wireline Formation Test
• MMDS — Multichannel Multipoint Distribution Service
• ACF — Access Coordination Function
• MA — Maintenance Action
• 3G — Third Generation (mobile communication system)
• CDA — Communications Decency Act's
• AAP — Alternate Access Provider
• PTI — Payload Type Indicator
• FFH — Fast Frequency Hopping
• WE — Western Electric
• DME — Distributed Management Environment (OSF)
• VCC — Voice Call Continuity
• UMTS — Universal Mobile Telecommunications Service
• ACA — Adaptive Channel Allocation
• MCD — Community Care Access Centre
• CRV — Call Reference Value
• C² — Command and Control
• ETOM — Enhanced Telecom Operations Map
• BREW — Binary Runtime Environment for Wireless
• AIS-P — Alarm Indication Signal - Path
• VFL — Visual Fault Locator
• AARQ — A-Associate Request
• SOR — Statement of Requirements
• MFC — Multi-Frequency Code
• SINS — Ship’s Inertial Navigation System
• GTM — Go to Meeting
• VADB — Virtual Auto Dial Backup
• DRQ — Disengage Request
• UAN — Universal Area Network
• MH — Message Handler
• MBS — Maximum Burst Size (ATM)
• ASD — Alternative Service Delivery
• FLL — Fixed-Loss Loop
• EVC — Electronic Voucher Charging
• WATS — Wide Area Telecommunications Service
• SDSL — Symmetrical Digital Subscriber Line
• NANP — North American Numbering Plan
• AIS-V — Alarm Indication Signal - Virtual
• TP — Transition Point
• ILD — International Long Distance
• RDSS — Radio Determination Satellite Service
• CRBT — Color Ring Back Tone
• DE — Discard Eligible
• BOM — Bit-Oriented Message
• EM — Element Manager
• TRANSEC — Transmission Security
• APPN — Advanced Peer-to-Peer Network
• ARS — Automatic Route Selection
• DS-3 — Digital Signal, Level 3

• CCS — Common Command Set
• PGP — Pretty Good Protection (encryption)
• B-CPE — Broadband Customer Premises Equipment
• ICI — Interexchange Carrier Interface
• TSI — time-slot interchange
• PMT — Program Management Team
• CELP — Code Excited Linear Prediction
• CE — Channel Element
• ATB — Above-Ground Telecommunications Backbone
• CD-ROM — Compact Disk-Read-Only Memory
• MF — Multiple Frequency
• LCP — Local Control Point
• BHA — Busy Hour Attempts
• ROSE — Remote Operations Service Element
• WVOIP — Wireless Voice over Internet Protocol
• SRA — Seamless Rate Adaptation
• LLA — Link Level Access
• SCR — System Change Request
• WRT/R — Wireless Transmitter/Receiver
• LAPB — Link Access Protocol-Balanced
• RSL — Remote Serial Link
• SMS — Service Management System
• RTU — Right to Use
• BPP — Billed Party Preference
• BUS — Business Units
• ETSI — European Telecommunications Standards Institute
• PTM — Point-To-Multipoint
• FCA — Fixed Channel Allocation
• CSDU — Core Service Data Unit
• IBS — In-Building Solutions
• DC — Device Control
• VLP — Very Low Power
• MC — Maintenance Control
• DNSIX — Defense Network Security Information Exchange
• CD ROM — Compact Disc Read-Only Memory
• CSLIP — Compressed SLIP
• MP — Modulation Parameter
• AB — Answer Back
• CAPTAIN — Character And Pattern Telephone Access Information Network
• CMS — Conversational Monitor System
• INTELSAT — International Telecommunications Satellite
• E — Exchange
• MRCA — Most Recent Common Ancestor
• LEED — Low-energy Electron Diffraction
• DTAP — Direct Transfer Application Process
• ET — Electronic Transmission
• GRUB — Greedy Reclamation of Unused Bandwidth
• MSG — Management Steering Group
• WIN — Wireless Intelligent Network
• SNI — Subscriber Network Interface

• 4WE&M — Four-Wire Ear and Mouth
• AOS — Alternate Operator Service
• STMR — Sidetone Masking Rating (telecommunications)
• VGF — Voice Grade Facility
• AEA — American Electronics Association's
• NICT — National Institute of Information and Communications Technology
• FLN — Fixed Line Network
• STE — Section Terminating Equipment
• LDI — Long Distance Interconnect
• DTU — Date/Time Update
• CCS — Call Center Service
• VSM — Vestigial Sideband Modulation
• SCORM — Shareable Content Object Reference Model
• RADSL — Rate Adaptive Digital Subscriber Line
• LTU — Line Terminating Unit
• CLF — Carrier Line Failure
• AOC — ADSL (Asynchronous Digital Subscriber LIne) Overhead Control channel
• ATB — All Trunks Busy
• LMT — Lightwave Microcell Transceiver
• TEM — Transmission Electron Microscope
• 4WAI — Four-Wire Analog Interface
• STD — Standard Deviation
• BASIZE — Buffer Allocation Size
• BB — Blackberry
• VTIR — visible and thermal infrared radiometer
• CCS — Common Channel Signaling
• DTL — Defense Telephone Link
• CMA — Communications Management Association
• DPA — Distributed-Power Architecture
• RCP — Right-Hand Circular Polarization
• ATS — Abstract Test Suite
• PSLV — Polar Satellite Launch Vehicle (Indian Space Research Organization; India)
• SDLC — Systems Development Life Cycle
• NICAD — Nickel Cadmium
• TD — Transmit Data
• EEROM — Electronically Erasable Read-Only Memory
• RRC — Root Raised-Cosine
• LS — Loop Start
• LCU — Lightweight Computer Unit
• ADC — Advanced Data Control
• DECT — Digital Enhanced Cordless Telecommunication
• JWG — Joint Working Groupof
• AAL2 — ATM (Asynchronous Transmission Mode) Adaptation Layer 2
• ATTRA — Appropriate Technology Transfer for Rural Areas
• IMT-2000 — International Mobile Telecommunications 2000
• SGSN — Serving GPRS (General Packet Radio Service) Support Node
• RBOC — Regional Bell Operating Company (Baby Bell)
• DMNG — Digital Mobile News Gathering
• LOB — Line Of Bearing/Balance
• CPOP — Circuit Precedence Over Packet data

• CFOT — Certified Fiber-Optic Technician
• SSN — Switched Service Network
• GSM — Global System for Mobile telecommunications
• ESM — electronic support measure
• OTF — On-The-Fly (data acquisition method)
• QOTS — Quality Of Telephone Services
• NCF — Network Control Facility
• ULL — Unbundled Local Loop
• CRS — Cell Relay Service
• DS-1 — Digital Signal, Level 1
• LPDP — Local Policy Decision Point
• NBP — Name Binding Protocol
• WTNM — Working Telephone Number Management
• CLLM — Consolidated Link Layer Management
• AH — Authentication Header
• TJB — Telephone Junction Box
• AFCEA — Armed Forces Communications and Electronics Association's
• TCB — Telecommunication Certification Body
• ZBTSI — Zero Byte Time Slot Interchange
• DOD — Direct Outward Dialing
• ET — Exchange Terminal
• IPNG — Internet Protocol, Next Generation (now called IPv6)
• BSC — Bi-Synchronous Communications
• ESCON — Enterprise System Connection
• SGCP — Simple Gateway Control Protocol
• SN — Switching Network
• AAV — Alternative Access Vendor
• VP — Virtual Path (ATM)
• MPU — Main Processor Unit
• TSC — Test System Controller
• RAD — Recorded Announcement Device
• AIU — Analog Interface Unit
• ADIF — Accounting Data Interchange Format
• ALCAP — Access Link Control Application Protocol
• ADF — Application Dedicated File
• NSEP — National Security Emergency Preparedness
• TWX — Teletypewriter Exchange Service
• BTS — Base Transceiver Station (cellular)
• TESMA — Telecommunications Equipment and Services Master Agreement
• CFS — Call for Service
• ATU-R — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Remote terminal end
• VO — Voice Only
• BIS — Brought Into Service
• BT — Burst Tolerance
• FI — Format Identifier
• LCF — Location Confirm
• LULT — Line Unit/Line Termination
• AMTFT — Active Matrix Thin Film Transistor
• RJ-11 — Registered Jack type 11 (4-wire connector)
• WNAN — Wireless Neighborhood Area Network

• NEF — Network Element Function
• MIR — Maximum Information Rate
• VSAT — Very Small-Aperture Terminal
• DPBX — Digital Private Branch Exchange
• SMU — Service Management Unit
• REN — Ringer Equivalence Number
• ACM — Address Complete Message
• IBSS — Independent Basic Service Set
• EC — Equipment Controller
• PTE — Path Terminating Equipment (SONET)
• CCCI — Command, Control, Communications and Intelligence
• BHCC — Busy Hour Call Completions
• UCF — Unregistration Confirm
• ACRE — Authorization and Call Routing Equipment
• VOB — Voice Over Broadband
• TMF — Telecommunications Management Forum
• M — Memory
• CBMS — Computer-Based Message System
• FMR — Follow Me Roaming
• MAPI — Messaging Applications Programming Interface
• HU — Hook Up
• MEECN — Minimum Essential Emergency Communication Network
• TCL — Transverse Conversion Loss
• RFR — Radio Frequency Radiation
• CLASS — Custom Local Area Signaling Services
• SACS — Security Access Control System
• ARFA — Allied Radio Frequency Agency
• SBX — Small Business Exchange
• DDS — Dataphone Digital Service (AT&T)
• RX — Receiver
• BAF — Bellcore AMA (Automatic Message Accounting) Format
• ANAC — An Automatic Number Announcement Circuit
• NT — Network Termination
• B-ISDN — Broadband ISDN
• WIVO — WIreless VelOcity
• VOFR — Voice Over Frame Relay
• PROV — Provisioning
• COP — Character Oriented Protocol
• EADAS — Engineering and Administrative Data Acquisition System
• SLIC — Subscriber Loop Interface Circuit
• CTO — Commonwealth Telecommunications Organisation
• CLD — Cross-Layer Design
• CAP — Competitive Access Provider
• SMDR — station message detail recording
• FPS — Framing Pattern Sequence
• TT — Text-Telephone
• IDCU — Integrated Digital Carrier Unit
• NSDI — National Spatial Data Infrastructure
• QS — Quasi-Synchronous
• COC — Central Office Connection

• ADM — Administration Building
• DPDT — Double-Pole Double-Throw
• CD — Committee Draft
• APS — Advanced Power System
• ACL — Asynchronous Connection-less Link
• DPST — Double-Pole Single-Throw
• CMTS — Cellular Mobile Telephone System
• IMTS — Improved Mobile Telephone Service
• QOSM — Quality of Service Management
• DECCO — DISA Defense Commercial Communications Office
• RTB — Retransmission Buffer
• SSU — Synchronization Supply Unit
• FT1 — Fractional T1
• DDU — Digital Data Unit
• LIDB — Line Information DataBase
• AVT — Audio Visual Telecommunications
• DCO — Dial Central Office
• RCU — Radio Control Unit
• AGCH — Access Grant Channel
• BTP — Business Telecom Products, Inc.
• CATI — Computer-Assisted Telephone Interviewing
• AA — Auto-Answer
• ULF — Ultra Low Frequency
• MEH — Mobile-Executed Handoff
• MA — Message Analysis
• CTTC — Centre Tecnològic de Telecomunicacions de Catalunya
• FMS — Fixed Mobile Substitution
• IVP — Integrated Voice Protocol
• PFE — Power Feed Equipment
• ALI — Automatic Location Identifier
• LCN — Local Communications Network
• CAE — Common Application Environment
• CDVT — Cell Delay Variation Tolerance
• PVN — Private Virtual Network
• DSVD — Digital Simultaneous Voice and Data
• SC — Switching Center
• ATIS — Automatic Transmitter Identification System
• 2G — Second-generation mobile telephone system
• DIL — Direct Inward Line
• WLL — Wireless Local Loop
• FESS — Flywheel Energy Storage System
• FR-SSCS — Frame Relay Service Specific Convergence Sub-Layer
• SAP — Service Advertising Protocol
• JWP — Joint Working Party
• DR — Design Review
• OMP — Open Management Platform
• RAI — remote alarm indication
• UDP — Up Down Pair
• MIS — Marketing Intelligence System
• RDT — Recall Dial Tone

• P&A — Privacy and Authentication
• TUP — Telephone User Part
• TCA — Threshold Crossing Alert
• PAM — Pulse Amplifier Modulation
• FUD — Fair Use Doctrine
• ACNA — Access Customer Name Abbreviation
• DTU — Data Terminal Unit
• DLT — Digital Line Termination
• COFA — Change Of Frame Alignment
• WFG — Wireless Firewall Gateway
• PSDN — Public Switched Digital Network
• CPN — calling party number
• DDP — Datagram Delivery Protocol
• DDM — Data Distribution Manager
• OSD — Onscreen Display
• DACS — Digital Access Carrier System
• DTW — Dynamic Time Warping
• TMRS — TRAFFIC MEASUREMENT AND RECORDING SYSTEMS
• CSTA — Computer Supported Telecommunications Applications
• CRL — Computing Research Laboratory
• RCMAC — Recent Change Memory Administration Center
• ISD — International Subscriber Dialling
• TIMS — Telephone Information Management System
• NFR — Near-Field Recording
• TA — Terminal Adapter (ATM)
• VR — Virtual Router
• WDS — Wireless Distribution System
• CDR — call detail recording
• VDSL — VHBR (Very High Bit Rate) Digital Subscriber Line
• CM — Connection Manager
• VDR — Voice Digitization Rate
• BWX — Broadband Wireless Exchange
• IPXCP — Internetwork Packet Exchange Control Protocol
• TMTC — Telemetry and Telecommand
• ECSA — Exchange Carriers Standards Association
• IR — International Roaming
• FC — Frame Control
• NMC — Nortel Matra Cellular
• VTI — Vietnam Telecom International
• BPSK — Binary Phase-shift Keying
• ANSI — Advanced Network Signaling Input
• TEHO — Tail End Hop Off
• CNID — Calling Number Identification Display
• APPC — Advanced Program-to Program Communications
• EGPRS — Enhanced General Packet Radio Service
• ITU-T — International Telecommunication Union - Telecommunications section
• DS-2 — Digital Signal, Level 2
• INSAT — Indian National Satellite
• MB — Measured Business
• ADAD — Automatic Dialing Announcing Device

• TOMS — Telecom Operations Management System
• VAR — Value-Added Reseller
• CCH — Common Channel Handler
• AADS — Ameritech Advanced Data Services
• LCU — Line Control Unit
• AFPS — Automatic Facility Protection Switching
• CNI — Calling Number Identification
• DSCS — Defense Satellite Communication System
• CPAP — Customer Premises Access Profile
• TTC — Telemetry Telecommand and Control
• OMF — Object Management Framework
• EMV — EuroPay, MasterCard, Visa
• PD — Pulse Duration
• UCA — Utility Communications Architecture
• CRTS — Cellular Radio Telecommunications Service
• CSCW — Computer-Supported Cooperative Work
• WDSL — Wireless Digital Subscriber Line
• 4G — Fourth Generation
• ZLE — Zero-Latency Enterprise
• TCM — Time Compression Multiplexer
• VHM — Voice Health Monitor
• WPBX — Wireless Private Branch Exchange
• PDSO — Packet Data Security Overlay
• AEIMP — Apple Event Interprocess Messaging Protocol
• BP — Block Parity
• SDCCH — Standalone Dedicated Control Channel
• LAP-B — Link Access Procedure - Balanced
• LRF — Laser Range Finder
• LBX — Low Bandwidth X
• DPT — Dial Pulse Terminate
• MDRAM — Multibank Dram
• ACMA — Atlantic Cable Maintenance Agreement
• DFT — Draft
• RTFM — Read The Friendly Manual
• RLA — Received Level Average
• GOMP — Get Off My Phone
• PCN — Personal Communications Networks (European PCS)
• PSQM — Perceptual Speech Quality Measure
• ATIS — Alliance for Telecommunications Industry Solutions
• WIM — WAP (Wireless Application Protocol) Identity Module
• IVN — Interactive Video Network
• RLC — Reverse Link Channel
• LAT — Local Area Transport (network)
• LRM — Long Reach Multimode
• TSDU — Transport Service Data Unit
• SR — Scanning Radiometer
• NESC — National Electrical Safety Code
• RTT — Roof Top Tower
• HCV — High Capacity Voice
• CDA — Communications Decency Act of 1996

• PLE — Path Length Efficiency
• TP — Telephone Pole
• ADTM — Asynchronous Data Transfer Mode
• TPSP — Third Party Service Provider
• NSN — National Significant Number
• ANT — ADSL Network Terminator
• TLC — Television the Learning Channel
• NC — Network Channel
• PJC — Pointer Justification Count
• CC — Composite Clock (SONET)
• NCOS — Network Class Of Service
• EDGE — Enhanced Data for GSM (Global System for Mobile communication) Evolution
• XNS — Xerox Network Systems
• VLBI — Very Long Baseline Interferometry
• GS — Ground Start
• MSS — Mobile Satellite Service
• DCS — Digital Cross-connect Switch
• SMAS — Service Management System
• DCSS — Digital Cross-connect Systems
• WPC — Wireless Personal Communications
• IRAC — Internal Review and Audit Compliance
• SAA — Service Adaptive Access
• BAM — Basic Access Module
• OA&M — Operations, Administration & Maintenance
• ETB — Empresa de Telecomunicaciones de Bogotá
• SQL — Specified Quality Level
• USA — Underground Service Alert
• BCIX — Berlin Commercial Internet Exchange
• MQFP — Metric Quad Flat Pack
• LMBCS — Lotus Mult-Byte Character Set
• IRLAP — InfraRed Link Access Protocol
• SOHO — SOlar and Heliospheric Observatory
• GFI — General Format Identifier
• CLOS — Clear Line Of Sight
• MNA — Multi-Network Area
• IDLC — Integrated Digital Loop Carrier
• SDP — Software Development Process
• CCP — Compression Control Protocol
• VDSL — Very high-speed Digital Subscriber Line
• MITS — Metaphors for Integrated Telecommunications Services
• USPI — Universal Serial Phone Interface
• PNM — Pulse Number Modulation
• VSC — Vertical Service Code
• BSRF — Basic System Reference Frequency
• MCR — Minimum Cell Rate (ATM)
• CIPOA — Classical Internet Protocol over ATM (Asynchronous Transfer Mode)
• HBH — Hop-By-Hop
• JMA — Japanese Meteorological Agency
• MAPDU — Management Application Protocol Data Unit
• ATL — Advanced Technology Laboratory

• FECC-F — Forward Error Correction Count - Fast data
• QPM — QoS (Quality of Service) Policy Manager
• MVDS — Microwave Video Distribution System
• GLT — Great Lakes Telecom
• MODEM — modulation and demodulation
• CCSS6 — Common Channel Signaling System # 6
• VOB — Versioned Object Base
• WDMW — Web Directory for Mobile and Wireless
• LSMS — Local Service Management System
• DACS — Digital Access and Cross-Connect System
• CALA — Customer Address Location Area
• MT — maintenance
• TNMS — Telecommunications Network Management System
• ADTS — Ameritech Digital Transport Service
• ESA — Enhanced Subscriber Authentication
• SHR — Self-Healing Ring
• UIT — Union Internationale des Télécommunications
• CDM — Configuration Data Manager
• ABR — Available Bandwidth Rate
• CWTS — China Wireless Telecommunication Standard
• ESG — Enhanced Service Gateway
• CSR — Customer Service Report
• PCCA — Portable Computer Communications Association
• AI — Adapter Interface
• CAL — Customer Access Line
• MOC — Maintenance and Operations Console
• WLAP — Wireless LAN (Local Area Network) Access Point
• LTU — Line Termination Unit
• MCD — Mobile Communications Division
• TRCSL — Telecommunications Regulatory Commission of Sri Lanka
• UDT — Unreliable Data Transfer
• DEO — Digital End Office
• WNAP — Wireless Network Access Point
• VLF — Vertical-Laminar-Flow
• DUL — Dial-Up List
• AMEL — Active-matrix Electroluminescent
• DPDCH — Dedicated Physical Data Channel
• ECS — Encryption Control Signal
• WAWS — Washington Area Wideband System
• DS0 — Digital Signal Zero
• SPI — Security Parameters Index
• HPN — Home Phone Network
• PRM — Performance Report Message
• TP — Termination Point
• WDP — Wireless Datagram Protocol
• 800 — Freephone
• DACS — Digital Access Cross-Connect Switch
• CAN — Controller Area Network
• FRSS — Frame Relay Switching System
• FR — Functional Requirement

• DBN — Dial-Back Number
• B-ISUP — Broadband ISDN User Part
• PVG — Personal Voice Greeting
• ABATS — Automatic Bit Access Test System
• CM — Common Mode
• DTR — Down-Time Ratio
• AWA — Advanced Wireless Access
• FEBE-F — Far End Block Error count - Fast data
• CID — Craft Interface Device
• WFA — Work Force Administration
• C/T — Carrier to Noise Temperature Ratio
• WDM — Windows Driver Model
• DORA — EV-DO (EVolution-Data Optimized) standard Revision A
• TCC — Transmission Control Code
• MEI — Multiple Extension Interworking
• SHD — Smart Handheld Device
• CPN — Customer Premise Network
• OID — Object Interaction Diagram
• EC — Enhanced Cellular
• FTAM — File Transfer Access and Manipulation
• NARC — Non-Automatic Relay Center
• PSN — Packet-Switched Network
• TPS — Telephone Preference Service
• WEDE — Wireless Enterprise Delivery Environment
• SSP — Security Service Provider
• WPKI — Wireless Public Key Infrastructure
• QLLC — Qualified Logical Link Control
• NMC — Network Model Coverage
• D-AMPS — Digital Advanced Mobile Phone Service
• DLE — Digital Local Exchange
• ELSEC — Electronic Security
• TACS — Total Access Cellular System
• LZ — Lempel-Ziv compression algorithm
• BT — Back Trace
• DBF — Digital Beam-Forming
• VCR — Videocassette Recorder
• JEDEC — Joint Electronic Devices Engineering Council
• COBE — Corporate Owned Business Only
• OPS/INE — Operations System/Intelligent Network Element
• DISA — Direct Inward Switch Access
• LMU — Line Monitor Unit
• AL — Alignment
• RCF — Remote Call Forwarding
• YIP — Your Internet Phone
• ERM — Explicit Rate Marketing
• RTC — Right to Carry
• ILF — Initial License Fee
• CFNA — Call Forwarding No Answer
• LVM — Line Verification Module
• UR — User Rate

• NMF — Network Management Forum
• INA — Information Network Architecture
• VNS — Virtual Network System
• AMTI — Airborne Moving Target Indicator
• IPCDN — IP over Cable Data Networks
• PVG — Packet Voice Gateway
• QPA — Quality Performance Analysis
• CEE — Communaut? Economique Europ?enne
• BTO — Betts Telecom Oklahoma
• HQGSM — High-Quality Global System for Mobile communications
• EUMETSAT — European Meteorological Satellite
• SS — Switching System
• DCEF — Distributed Cisco Express Forwarding
• PTN — Public Telephone Network
• ML-PPP — Multilink Point-to-Point Protocol
• AAPR — Annual Average Performance Ratio
• VMU — Virgin Mobile USA (mobile phone network)
• CHT — Active
• RYP — Russian Yellow Pages
• A/V — Audiovisual
• ACTS — Automated Coin Toll System
• CT — Cordless Telecommunications
• RP — Radio Port
• UPC — Usage Parameter Control
• VTA — Vermont Telecommunications Authority
• M2M — Multipoint-to-Multipoint
• AMOLED — Active Matrix Organic Light-Emitting Diode
• IDD — International Direct Dialing
• FDMMA — Frequency Division Multiplexing Multiple Access
• INAP — Intelligent Network Application Part
• FD — Full Duplex
• OIM — Operations Interface Module
• DTAM — Document Transfer and Manipulation
• TRAC — Totally Reconfigurable Analog Circuit
• QOV — Quality of Voice
• ESDS — Electrostatic Discharge Sensitive
• HDSL2 — High-bit-rate Digital Subscriber Line, Second Generation
• PCIA — Personal Communications Industry Association
• ULP — Upper Layer Protocol
• DAVIC — Digital Audio Video Council
• NAM — Numeric Assignment Module
• SMDS — Switched Multi-megabit Data Service
• TI — Telecom Implementation
• SCC — Specialized Common Carrier
• TNI — Telephone Network Interface
• CD-R — Compact Disk-Recordable
• VTQ — Voice Transmission Quality
• NPSI — Network Packet Switching Interface
• RANAP — Radio Access Network Application Part
• NMS — NetWare Management System

• FEAC — Far End Alarm and Control
• PTT — Post Telegraph and Telecommunications
• THZ — TeraHertz
• SAMA — Spread Aloha Multiple Access
• CPCI — Compact Peripheral Component Interconnect
• NRI — Net Radio Interface
• PIH — Pin in Hole
• ITFS — International Toll Free Services
• LI — Length Indicator
• BFS — Broadcast File System
• QNC — Quick Net Connect
• DMS — Distribution Management System
• N-AMPS — Narrowband Advanced Mobile Phone Service
• IMT-FT — International Mobile Telecommunications - Frequency Time
• STARS — Software Technology For Adaptable, Reliable Systems
• LADS — Local Area Data Service
• UDS — Universal Directory Service
• ADTS — Automated Digital Terminal System
• BSS — Broadband Switching System
• ERI — Enhanced Roaming Indicator
• WCMP — Wireless Control Message Protocol
• WBOK — Wireless Broadband of Oklahoma
• 802.X — Series of LAN standards developed by IEEE
• STN — Station Terrienne de Navire
• IOC — Interoffice Channel
• STUN — Simple Traversal of UDP (User Datagram Protocol) through NAT (Network Address Translation)
• QR — Quality record
• RID — Routing Identifier
• CMISE — Common Management Information Service Element
• CEPT — Conference of European Posts and Telecommunications
• RBT — Ring Back Tone
• SVW — Sioux Valley Wireless
• LGE — Loop- or Ground-start Exchange
• PTN — Provider Telecommunications Network
• AFRINIC — African Network Information Centre
• AEE — Agent Execution Environment
• DSX — Digital Signal Cross-Connect
• ARDIS — Advanced Radio Data Information Service
• DDSN — Digital Derived Services Network
• EC — Entropy Coding
• CODEC — Coder-Decoder (usually for audio/video data)
• DCC — Digital Control Channel
• GEO — Geostationary Earth Orbit
• WISP — Wireless Internet Service Provider
• NECA — National Exchange Carrier Association
• CSL — component sublayer
• SWIFT — Society Of Worldwide Interbank Financial Telecommunications
• WBTS — Wireless Business Telephone System
• RCR — Research and Development Center for Radio Systems
• CCC — Clear Channel Capability

• SMLC — Serving Mobile Location Center
• IATA — Intelligent Agents for Telecommunication Applications
• ISDP — Intelligent Shared Dual Path
• ISTD — International Subscriber Trunk Dialing
• USD — Universal Service Directive
• 888 — Freephone
• ATACS — Army Tactical Communications System
• VPDN — Virtual Private Dial-up Network
• XWI — XML (extensible markup language) for Wireless Images
• LRB — Loop Reverse Battery
• IDEN — Integrated Dispatch Enhanced Network
• TRANS — Transaction
• D/I — Drop and Insert
• CVT — Circuit Validation Test
• D3 — Digital channel bank, Third generation
• CARS — Community Antenna Relay Service
• DRTL — Dial Repeating Tie Line
• AON — All-Optical Network
• OCI — object code insertion
• SAMI — Structured Adjustment & Maintenance Interface
• MDCP — Media Device Control Protocol
• DORK — Disciples Of The Righteous King
• PSPDN — Packet Switched Public Data Network
• FIC — Flight Information Center
• LQD — Line Quality Disturbance
• CLASS — Cell Level ATM (Asynchronous Transfer Mode) Services Simulator
• IDSL — ISDN (Integrated Services Digital Network) Digital Subscriber Line
• BDFB — Battery Distribution Feeder Bay
• IDPR — Interdomain Policy Routing
• RXP — Roaming Exchange Protocol
• SM — Spectrum Management
• TAU — Test Access Unit
• COMPANDER — COMpressor/exPANDER
• GOS — Gerry Otis Simpson
• RFH — Remote Frame Handler
• CNE — Certified Novell Engineer
• AFIPS — American Federation of Information Processing Societies
• EM — Engineer(ing) Manual
• CALC — Customer Access Line Charge
• ASA — Avaya Site Administration
• QOD — Quality of Data
• UAC — Uniform Annual Charge
• LXT — Local Exchange Terminal
• SRU — Search and Rescue Unit
• MNOC — Mobile Network Operation Center
• SNI — Service Node Interface
• PI — Processor Interface
• CR — Connection Request
• C — Connectivity
• HUMAN — High-speed Unlicensed Metropolitan Area Network

• SJR — Signal-to-Jamming Ratio
• FEBE-I — Far End Block Error count - Interleaved data
• ATMS — automatic transmission measuring system
• ENUM — tElephone NUmber Mapping
• TLP — Transmission Level Point
• VPL — Virtual Path Link (ATM)
• MOC — Ministry of Communications
• ECC — Emergency Communications Center
• EFD — Event Forwarding Discriminator
• TARP — Target Identifier Address Resolution Protocol
• RU — Release Unit
• PRE — Preliminary
• MLHG — Multi-Line Hunt Group
• CCITT — Comite Consultatif International Telegraphique et Telephonique (now ITU-T)
• OMC — Operations and Maintenance Centre
• EA — expedited acknowledgement
• NML — Network Management Layer
• BC — Basic Call
• CMAS — Cellular Management System
• LMS — Location and Monitoring Service
• DOD — Dial on Demand
• ISDNUP — Integrated Services Digital Network User Part
• WBI — Wireless Broadband Internet
• GCS — Global Communication System
• MTBM — Mean Time Between Maintenances
• 3RNGR — Three Ringer
• WTA — Western Telecommunications Alliance
• UIF — User Interface Framework
• CSAP — Core Service Access Point
• COI — Community of Interest
• VCA — Voice Connecting Arrangement
• V — Vector
• WLNP — Wireless Local Number Portability
• GVPN — Global Virtual Private Network
• WAW — Wide Area Wireless
• FTTE — Fiber to the telecom enclosure
• DAF — Directory Access Function
• ETS — End of Transmission Signal
• BMAS — Business Management System
• CDSL — Consumer Digital Subscriber Line
• RCQS — Roaming Call Quality Sensor
• DCB — Digital Channel Bank (Sprint)
• TI — Time
• LLB — Line LoopBack
• MMJ — Modified Modular Jack
• USF — Universal Server Farm
• E-TDMA — Expanded Time Division Multiple Access
• VMO — Virtual Mobile Operator
• WAPI — Wireless LAN Authentication and Privacy Infrastructure
• AASR — Abbreviated Access Service Request

• XOT — X.25 Over TCP (Transmission Control Protocol)
• QC — Quality Circle
• VOX — Voice Operated Transmission
• SCMG — SCCP Management
• ICSF — Internet Connection Sharing and Firewall
• WTL — Wireless Transport Layer
• TACSIM — Tactical Simulation (Simulator)
• LQR — Line Quality Report
• TVRO — Television Receive-Only
• CIS — Center for Integrated Systems
• IMT-A — International Mobile Telecommunications - Advanced
• AUSPI — Association of Unified Telecom Service Providers of India
• TPF — Transmission Priority Field
• ATL — Atlanta
• SCRC — SCCP Routing Control
• VVP — Versatile Voice Processing
• FOE — Fiber Optic Equipment
• DTS — Digital Terminal Systems
• PAGCH — Paging and Access Grant Channel
• DH — Delivery Head
• SMASE — Systems Management Application Service Element
• TFL — Telecom Fiji Limited
• QEDI — Quod Erat Demonstrandum
• RCT — remote Control Terminal
• SIGTRAN — Signaling Transport
• FWS — Fixed Wireless Services
• 3WC — Three Way calling
• SAMS — Service Agreement Management System
• DRTT — Dial Repeating Tie Trunk
• AT — Attenuation
• DTAU — Digital Test Access Unit
• TASI — Time Assigned Speech Interpolation
• INWATS — INward Wide Area Telecommunications Service
• FRAD — Frame Relay Assembler/Disassembler
• SAR-PDU — Segmentation And Reassembly Protocol Data Unit
• ARJ — Admission Reject
• WGX — Wireless Gateway Switch
• NF — Not Found
• PRM — Premium Rate
• ENS — Enhanced Network Services
• DNA — Do Not Answer
• UVG — Universal Voice Grade
• EPL — Echo Path Loss
• WUP — Wired Up Privacy
• GPBX — Global Private Branch eXchange
• BPOP — Building Point of Presence
• WTC — Wireless Topic Center
• D/A — Digital-to-Analog converter
• DTC — Department of Telecommunications and Cable
• WIPS — Wireless Intelligent Personal Server

• USOC — Universal Service Order Code (cable colors)
• PMD — Physical Media-Dependent
• SPT — System Page Table
• VGCP — Voice Grade Channel Processor
• ICLD — Inter-Channel Level Difference
• CANARIE — Canadian Network for Advancement of Research, Industry, Education
• DTV — Digital Television
• DOITT — Department of Information Technology and Telecommunications
• BSSMAP — Base Station System Management Application Part
• NQA — Niveau de Qualite Acceptable
• TCBH — Time Consistency Busy Hours
• ICTA — Idaho Cable Telecommunications Association
• NBDP — Narrow Band Direct Printing
• S&F — Store & Forward
• TD-SCDMA — Time-division Synchronous Code-division Multiple Access
• ETT — Emerging Telecommunications Technologies
• UDC — Universal Digital Channel
• CSAC — Computer Science Accreditation Commission
• TDR — Time Domain Reflectometer
• AAS — Automatic Announcement Subsystem
• LEC — Liquid Encapsulated Czochralski
• PC — Project Coordinator
• EC — Echo Cancelling
• TXS — Telephone eXchange Strowger
• FLC — Forward Link Channel
• CONS — Connection-oriented Network Services
• VAB — Vehicle Assembly Building
• EDT — European Deaf Telephone
• NR — Nummer
• RSN — Readable Serial Number
• CTIT — College of Telecommunications and Information Technology
• BFW — Broadband Fixed Wireless
• PNE — Path Number Efficiency
• BGP4 — Border Gateway Protocol 4
• LTU — Line Test Unit
• HDB3 — High-Density Bipolar Three-bit substitution
• TWL — Leased Teletypewriter Service
• TSC — Technical Standards Committee
• VGC — Voice Grade Channel
• RBS — Robbed Bit Signaling
• C³ — Command, Control and Communications
• TWA — The Wireless Association (former Cellular Telecommunciations and Internet Association)
• DCID — Downstream Channel ID
• AMC — Adds, Moves and Changes
• VMWI — Voice Message Waiting Indicator
• CMOS — Cellular Management Operation System
• IPN — Intelligent Peripheral Node
• TWX — Teletypewriter Exchange (Telex)
• RZ — Return to Zero
• SS6 — Signalling System 6

• DCU — Distribution and Control Unit
• ALT — Automatic Link Transfer
• BTU — Basic Transmission Unit
• SCE — Service Creation Environment
• RSS — Received Signal Strength
• ITA — Illinois Telecommunications Association
• 3WO — Third Wire Open
• T&R — Tip and Ring
• ZD — Ziff-Davis
• WTA — Wireless Telephony Applications
• CMAP — Connection Management Access Protocol
• LCT — Large Capacity Tandom
• EOI — End of Image
• KTF — Korea Telecom Freetel
• DS — Delivery System
• STP — Shielded Twisted Pairs
• MHD — Maximum Hour Demand
• LDB — Last Data Bit
• ELEC — Enterprise Local Exchange Carrier
• TFO — Tandem Free Operation
• JDC — Japan Digital Cellular
• RCH — Receive Channel
• BETRS — Basic Exchange Telecommunications Radio Service
• CSAA — Central Service Area Authority
• SPU — Service Publication Unit
• SSCP — System Services Control Point
• CSV — Circuit Switched Voice
• LO — Lockout
• MVD — Motion Vector Data
• Q3 — Network Management Interface
• WAVE — Wireless Access in Vehicular Environments
• IOT — Interoffice Trunk
• TTG — Test Tone Generator
• SARTS — Switched Access Remote Test System
• HSCSWD — High-Speed Circuit-SWitched Data
• VQA — Voice Quality Analyzer
• TRAI — Telecom Regulatory Authority of India
• SES — Scientific and Engineering Software
• IRAC — Interdepartment Radio Advisory Committee
• FOTS — Fiber Optical Transmission System
• CCC — Credit Card Calling
• FACS — Facility Assignment and Control System
• ASIC — Application Specific Instruction Code
• CIU — Communications Interface Unit
• SF — Superframe
• SPCS — Stored Program Control Switch
• CUG — Closed Users Group
• UPS — Un-interruptable Power Supply
• RDI-L — Remote Defect Indicator - Loop
• O/G — Outgoing

• CMT — Commercial Metering Transponder
• DFRI — Datacom Reference Frame Input
• PSC — Picture Start Code
• DBRN — deciBel Relative to Noise
• IPTD — Internet Protocol Telephony Design
• FHMA — Frequency Hopping Multiple Access
• ALIS — Access Lines in Service
• IPT — Internet Protocol Telephony
• CAS — Customer Accounts Service
• BTE — Broadband Terminal Equipment
• LVDS — Low-Voltage Differential Signalling
• ONI — Operator Number Identification
• DECT — Digital Enhance Cordless Telecommunications
• MIS — Miscellaneous
• S-HTTP — Service Hypertext Transport Protocol
• TLM — Trouble Locating Manual
• MMS — Multimedia Message Service
• ACEK — Authentication Encryption Key
• PTT — Post, Telephone, and Telegraph (authority)
• DS-1C — Digital Signal, Level 1C
• CCBS — Completion of Call to Busy Subscriber
• ACOU — Additional Call Offering Unrestricted
• ISSP — Interim Interswitch Signaling Protocol
• NMAS — Network Management System
• PPV — Pay-Per-View
• CLIP — Caller Line Identification Presentation
• APTG — Asia Pacific Telecom Group
• FECC-I — Forward Error Correction Count - Interleaved data
• DTF — Digital Transmission Facility
• LOF — Loss of Frame (ATM)
• AAR — Automatic Alternate Routing
• EXCL — Exclusive
• DMP — Decode Media Protocol
• DSP — Data Service Provider
• CSP — Converged Service Platform
• APS — American Protective Services
• BTL — Bell Telephone Laboratories, Inc.
• CDB — Configuration Data Base
• DMB — Disconnect and Make Busy
• STU — Signal Transmission Unit
• SNAP — Sub-Network Access Protocol
• TCIYP — Turks and Caicos Islands Yellow Pages
• DLE — Digital Line Equipment
• PSDS — Packet Switched Data Service
• ISP — International Signaling Point
• COB — Change Of Billing
• IR — Information Request
• ITCC — Information Technology and Communications Complex
• DM — Design Manager
• TPB — Talking Phone Book

• MC — Management Center
• ASTE — Advanced Systems and Telecommunications Equipment
• MLMS — Mobile Learning Management System
• DS-4 — Digital Signal Level 4
• WPOS — Wideband Packet over SONET (Synchronous Optical NETwork)
• DQDB — Distributed Queue Double Bus
• PR — Preference
• PM — Processable Mode
• SSTC — Subsystem Status Test Control
• STMB — Space-Time Multiple Beam
• MHL — Mobile High-definition Link
• AGPS — Assisted Global Positioning System
• HSUPA — High-Speed Uplink Packet Access
• RDF — Remote Distribution Frame
• WDRM — Wireless Design Reference Manual
• WFFQ — Wireless Fluid Fair Queueing
• TXD — Transmit Data
• SIO — Service Information Octet
• VPM — Voice Private Message
• KB — Knowledge-Based
• QQS — QOS (Quality Of Service) Query Service
• ARQ — Admission Request
• STN — Station Terrestre de Navire
• CSP — Continuous Speech Processing
• CNAD — Calling Name Delivery
• MC-SS — Multi-Carrier Spread Spectrum
• CUSA — Central Urban Service Area
• EML — Element Management Layer
• WARP — Wireless ATM (Asynchronous Transmission Mode) Research Project
• LRN — Local Routing Number
• ASP — Active Signaling Protocol
• HCDS — High Capacity Digital Services
• KBS — Kilobits per Second
• PHIGS — Programmer's Hierarchical Interactive Graphics System
• CASE — Computer-Assisted Software Engineering
• ITAD — Integrated Telephone Answering Device
• SAM — Service Access Multiplexer
• CCC — CDMA Cluster Controller
• LRF — Location Registration Function
• LATA — Local Access Transport Area
• ITOC — Independent Telephone Operating Company
• LBA — Location-Based Advertising
• STN — Stansted Airport railway station
• WAR — Wireless Access Revolution
• ECAN — Echo Cancellation
• DMTF — Desktop Management Task Force
• MSO — Marine Safety Office(r)
• NARSAP — National Advanced Remote Sensing Application Program
• UIH — Unnumbered Information with Header check
• SE — Southeast Euro

• JSR — Jump to Subroutine
• MIC — Management Integration Consortium
• UOS — Units of Service
• HIP — Holes In Phonebooks
• ISC — International Switching Center
• DX — Duplex Signaling
• DLC — Digital Leased Circuit
• SS5 — Signalling System 5 (2400/2600 Hz tones)
• MTS — Message Transmission Subsystem
• MRVT — MTP Routing Verification Test
• SQR — Signal to Quantizing noise Ratio
• APR — Alarm Processing Remote
• VQT — Voice Quality Testing
• DDSD — Delay Dial Start Dial
• ECA — Extended Calling Area
• MFJ — Modified Final Judgement
• RTU — Remote Test Unit
• MOD — Modulo
• HTO — Hellenic Telecommunications Organisation
• AS — Active Service
• TMF — Telemanagement Forum
• TSR — Terabit Switch/Router
• MES — Master Earth Station
• CC — Coordination Center
• OC-96 — Optical Carrier Signal, Level 96
• UBL — Universal Bluetooth Link
• IMPCS — Indian Mobile Personal Communication System
• BEAR — Billed Entity Applicant Reimbursement
• CITR — Canadian Institute for Telecommunications Research
• SVI — Service Interception
• BLP — Burst Loss Probability
• SWAT — Sit, Wait, and Talk
• HKT — Hong Kong Telecommunications Ltd.
• STAN — Supply of Telstra Account Number
• ESMT — Ecole Superieure Multinationale Des Telecommunications
• CFS — Customer Facing Services
• CCEA — Cross Connect Equipment Assignment
• IN7 — Compaq SS7 stack
• TSAP — Telecommunication Systems Analysis Position
• DFT — Draft Tax Forms
• AIOD — Automatic Identification of Outward Dialing
• SMDS — Satellite Multimedia Delivery System
• MMC — Minimum Monthly Charge
• BHP — Burst Header Packet
• VOX — Voice Exchange
• NATA — North American Telecommunications Allocation
• RSL — Request and Status Links
• W-CDMA — Wideband Code-Division Multiple-Access
• TBRL — Terminal Balance Return Loss
• ICCF — Interexchange Carrier Compatibility Forum

• CAS — channel associated signaling
• HFT — Human Factors in Telecommunications
• CVSD — Continuous Variable Slope Detection
• WSL — Wireless Systems Laboratory
• SNI — Subscriber-Network Interface
• ISSIP — Inter-Switching System Interface Protocol
• ACE — Authentication Encryption
• LSAP — Link Layer Service Access Point
• LQO — Line Quality Operation
• BTMS — BITEK Telecommunications Management System
• PTK — Post and Telecom of Kosovo
• SMG — Super Master Group
• AVD — Alternate Voice/Data
• OC-48 — Optical Carrier Signal, Level 48
• RDTD — Restricted Differential Time Delay
• QOSOI — Quality Of Service Over IP (Internet Protocol)
• VTAC — Vermont Telecom Advancement Center
• RFIDAI — Radio Frequency IDentification Association of India
• TSPS — Traffic Service Position System
• ROC — Receiver Operating Characteristic
• MAHO — Mobile Assisted Handoff
• SQE — Signal Quality Error
• MMDS — Multichannel Multipoint Distribution System
• UMTS — Universal Mobile Telecommunication Services
• TDB — Technology Development Board
• LAC — Line Assignment Center
• TAP — Test Access Path
• MCPC — Multiple Channels Per Carrier
• URC — Utility Reference Customer
• MOA — Managed Object Agent
• ACVS — Ameritech Customized Video Service
• PLM — Product Line Manager
• RPV — Resource Property Value
• SEM — Sionscanning Electron Microscopy
• STV — Subscription Television
• MIDP — Mobile Information Device Protocol
• EA — Emergency Action(s)
• LOH — Line Overhead
• WIRC — Wireless Information Resource Center
• IWU — Interworking Unit
• DM — delta modulation
• MDTS — Mobile Data Terminal Software
• DS-2 — Digital Stream 2 (6.312 mbps)
• DUNCE — Dial-Up Networking Connection Enhancement
• RA — Requirements Analysis
• NFF — Neutral File Format
• F — Flow
• CSCC — coordinated state change control
• NS — Non-Standard
• UASL — Unified Access Service License

• TAE — Terminal Adapter Equipment
• WOIP — Wireless communications over Internet Protocol
• STDM — Statistical Time Division Multiplexer
• DLCS — Digital Loop Carrier System
• TME — Telocator Message Entry
• VM — Voice Messaging
• MMDX — Multi-Media Data Services
• DCP — Distributed Collaborative Planning
• H11 — High-capacity ISDN channel operating at 1.536 Mbps
• ALC — Automatic Line Controller
• RCMS — Recharge Card Management System
• CAIRO — Communications Audio Interface for Remote Operations
• TSMA — Telecommunications Services Master Agreement
• ITU-TSS — International Telecommunications Union - Telecommunications Standardization Sector
• ATR — Advanced Telecommunications Research Institute
• MVDM — Multiple Virtual DOS Machine
• RDI-V — Remote Defect Indicator - Virtual
• CF — Coin First Payphone
• REGEN — Regenerator
• SGW — Server GateWay
• ECMA — European Community Manufacturers Association
• WNAS — Wireless Network Access Services
• OLEC — Other Local Exchange Carrier
• MBAC — Measurement-Based Admission Control
• PDE — Positioning Determination Entity
• IOCA — Interception of Communications Act
• GEO — Geostationary-Earth-Orbit
• LME — Line Monitoring Equipment
• AI — Airborne Interception
• TTIL — Team Telecom International Ltd.
• YAC — Yet Another Caller-ID program
• BISDN — Broadband Integrated Services Digital Network
• EV-DV — EVolution Data/Voice
• FCT — Fixed Cellular Terminal
• PPT — Permanent Part Time
• IO — Inter-Office
• ACL — Average Call Length
• WSN — Wireless Sensor Network
• ISDT — Integrated Services Digital Terminal
• LAP-B — Link Access Protocol-Balanced
• UPCU — Uplink Power Control Unit
• STE — Software Test Environment
• PPCH — Packet Paging Channel
• P — Point
• OC-1 — Optical Carrier Signal, Level 1
• ULC — Universal Line Card
• D4 — Digital channel bank, Fourth generation
• DVC — Digital Video Compression
• WIPI — Wireless Internet Platform for Interoperability
• MP — Master Processor

• TSD — Type Specific Driver
• IC-POT — Interexchange Carrier-Point of Termination
• ML — maximum length
• CLECS — Competitive Local Exchange Carriers
• CL — cell loss
• IPC — Initial Paging Channel
• SCU — Service Creation Unit
• CCO — Component Coordinator
• CW — Call Waiting Supplementary Service
• SGS — Software Generation System
• TSGR — Transport System Generic Requirements
• SPNI — Service Provider Network Identifier
• M-M — Multiplex-Multicast
• CR — Call Reference
• TBI — Telecom Brokerage Inc
• CNT — Corporacion Nacional de Telecomunicaciones
• SMSL — Standard Multimedia Scripting Language
• GTB — Global Telecoms Business
• MID — Maritime Identification Digits
• IMT — International Mobile Telecommunications
• ABTA — Associação Brasileira de Telecomunicações por Assinatura
• CICT — Commission on Information and Communications Technology
• ECC — Extended Community Calling
• RTAP — Real-Time Application Platform
• NSM — Network Status Monitor
• DCA — Distributed Communications Architecture
• WTA — Wireless Telephony Application
• IOS — Internet Over Satellite
• CDRM — Cross-Domain Resource Manager
• SMRP — Simple Multicast Routing Protocol
• IU — Internal Use
• BSVCI — Broadcast Signaling Virtual Channel Identifier
• FCCSET — Federal Coordinating Committee for Science, Engineering and Technology
• GSMA — Global System Mobile Association
• IOCDS — Input/Output Configuration Data Set
• CARS — Cable Antenna Relay Services
• DF — Distributing Frame
• DCCH — Digital Control Channel
• MTIE — Maximum Time Interval Error
• CGT — Consultants Group for Telecommunications
• AC — Absorption Coefficient
• MAPP — Mobile Access Personal Presence
• PTAM — Professional Telephone Answering Machine
• WCRL — Wireless Communications Research Laboratory
• NATS — North American Terrestrial System
• TSM — Transaction State Machine
• LCA — Line Circuit Address
• DCC — Data Communications Channel
• WAL — WATS (Wide Area Telecommunications Service) Access Line
• CASP — Communications Application Service Provider

• MNP — Microcomputer Networking Protocol
• USI — User System Interface
• PCMCIA — Personal Computer Memory Card Industry Association
• FCO — Foreign Central Office
• MAC — Message Authenticity Check
• DODD — Department Of Defense Directive
• HPPI — High-Performance Parallel Interface
• VRS — Video Relay Service
• TELECOM — Telecommunications
• DNR — Dial Number Recorder
• DAMPS — Digital Advanced Mobile Phone System
• PWT — Personal Wireless Telecommunication
• GATE — GPRS (General Packet Radio Service) Application Test Environment
• MEOS — Medium Earth Orbit Satellite
• UTP — Universal Transmission Protocol
• WNC — Wireless Network Communications
• NSPE — National Society of Professional Engineers
• SRVT — SCCP Routing Verification Test
• VRC — Virtual Redundancy Check
• SLICE — Selective Line Insertion Communication Equipment
• UBC — Utility Based Computing
• AWCC — Afghan Wireless Communications Company
• WPOP — Wireless Point-of-Presence
• CPS — Carrier Pre-Selection Service
• ROH — Receiver Off-Hook
• SSS — Subscriber Switching Subsystem
• UCS — Universityrsal Multiple-Octet Coded Character Set
• UCD — Uniform Call Distributor
• MFA — Multi-Frame Alignment
• LPU — Line Protection Unit
• EOT — Eastern Oregon Telecom
• ILETS — Idaho Law Enforcement Telecommunication System
• RFS — Resource Facing Service
• MMMS — Mobile Multimedia Messaging Service
• C-M — Control-Monitor
• TCCMS — Telecom Consumer Complaints Monitoring System (India)
• ISM — Interstellar Medium
• ACA — Automatic Circuit Assurance
• APTC — Atlantic Provinces Telecommunications Council
• SLM — Subscriber Loop Multiplex
• WCA — Wireless Cable Association International
• TELCO — Telecommunication Network for Cooperative Driving
• RRJ — Registration Reject
• BS — Busy Season
• POR — Power On Reset
• IOPS — Internet Operators Providers Services
• CCTA — Cctacentral Computer And Telecommunications Agency
• DMPB — Digital Multi-Point Bridging
• IRB — Instruction Reorder Buffer
• OMNCS — Office of the Manager, National Communications System

• SRTS — Synchronous Residual Time Stamp
• ITSO — International Telecommunications Satellite Organization
• TAAC — Telecommunications Access Advisory Committee
• DVI — Digital Video Interleaved
• WBA — Wireless Broadband Access
• IQ — In-phase and Quadrature
• IS-41 — TIA/EIA Interim Standard for mobile management
• DPCM — Differential Pulse Code Modulator
• VOF — Voice Over Fiber
• HTU-R — HDSL (High-bit-rate Digital Subscriber Line) Transmission Unit - Remote
• WTDM — Wideband Time Division Multiplexing
• GSN — GPRS (General Packet Radio Service) Support Node
• EVN — Enterprise VoIP (Voice-over-IP) Network
• LAPM — Link Access Protocol for Modems
• NBS — New British Standard
• SHN — Self-Healing Network
• CPT — Cellular Paging Teleservice
• WIX — Wireless Information EXchange
• SLC — Service Level Contract
• LAP-D — Link Access Procedure- Digital channel
• ECITTC — European Committee for Information Technology Testing and Certification
• TIMS — Transmission Impairment Measuring Set
• WSF — Workstation Function
• VRT — Voltage Reduction Technology
• BRTL — Blu-Ray Triple Layer
• LTP — Long Term Prediction
• STS — Synchronous Transfer Signal
• CT — Control terminal
• BUC — Block Up-Converter
• WAGN — West Antarctic GPS (Global Positioning System) Network
• URR — UHF (Ultra-High Frequency) Radio Receiver
• WDA — Wireless Developer Agency
• NSP — National Signaling Point
• OTH-B — Over-the-Horizon Backscatter
• SS3 — Signalling System 3 (2280 Hz tone)
• OTF — Optical Transfer Function
• IPCU — iPhone Configuration Utility
• VDV — Voice/Data/Video
• DWB — Designer's Workbench
• SUBT — Subscriber Terminal
• ITU-T — International Telecommunication Union-Telecommunications
• CLS — Current Level of Service
• MOE — Modem Operating Environment
• QLC — Quality Com
• FEFA — Far End Failure
• CSUR — Conscript Unicode Registry
• TADS — Target Acquisition Designation Sight
• MJU — Modular Jack Unit
• WTIA — Wireless Technology Industry Association
• RPE-LPC — Regular Pulse Excited - Linear Predictive Coder

• GTXC — Global Telephone Exchange Carrier
• CIL — Call Identification Line
• TEO — Telephone Equipment Order
• UIT — Union Internationale des Telecommunications
• SVC — Single Voice Coil
• UDLC — Universal Digital Loop Carrier
• PSX — Power System Exchange
• WIG — Wireless Internet Gateway
• EMLPP — Enhanced Multi-Level Precedence and Priority
• SIU — Subscriber Interface Unit
• WNVA — wireless Network Vicinity Assessment
• TP — Transaction Processor
• CPS — Customer Premises System (Bellcore)
• LGS — Loop- or Ground-start Subscriber
• ADTS-E — Ameritech Digital Transport Service - Enhanced
• NR — normal
• WACN — Wide Area Communications Network
• D — Diagonal
• XDSL — "generic" Digital Subscriber Line
• WICS — Wireless Integrated Communication System
• CCIR — Comittee Consultatif International Radiotelecommunique
• UPC — Universal Personal Communication
• FECC — Federal Emergency Communications Coordinator
• BU — Back Up
• WECA — Wireless Ethernet Compatibility Alliance
• SVGA — Super VGA
• IMMAT — Instituto Municipal Malvinas Argentinas Telecomunicaciones
• WTN — Working Telephone Number
• PRCS — Philips Radio Communications Systems
• DMI — Digital Multiplex Interface
• AC — Authorization Center
• ACR — Anonymous Call Rejection
• STE — Syrian Telecommunications Establishment
• LMS — Local Measured Service
• LUL — Land Use Line
• TSAR — Terminating Switched Access Rate
• WTK — Wireless Toolkit
• TRAN — Transient
• RLF — Remote Line Failure
• HDT — Host Digital Terminal
• BWRC — Berkeley Wireless Research Center
• IDC — Information Distribution Company
• QSK — Quadrature Shift Keying
• LOP-V — Loss Of Pointer - Virtual
• LLI — Logical Link Identifier
• ECSA — Exchange Carrier Standards Association
• ARAI — Adjunct Route Application Interface
• FICORA — Finnish Communications Regulatory Authority
• ILRM — Interim Local Management Interface
• TSAU — Time Slot Access Unit

• TSS — Telecommunication Standards Sector
• SCRB — SBC (Single Board Computer) Control and Reset Box
• CTS — Call Tracking System
• LAP — Link Access Protocol
• BNT — Broadband Networking Technology
• WNSK — Wireless Networking Starter Kit
• MSSC — Mobile Satellite Switching Centre
• VASP — Value-Added Service Provider
• WDF — Wireless Data Forum
• VOI — Voice Over Internet
• MERS — Most Economical Route Selection
• L — Lambert
• CPC — Crosstalk Prevention Coding
• WFM — Wireless Frequency Modulation
• WAPF — Wireless Application Protocol Forum
• WIWT — Wireless Internet of West Tennessee
• LET — Line Equipment Transfer
• OC-3 — Optical Carrier Signal, Level 3
• RSI — Record Status Indicator
• DCN — Disconnected and Changed Numbers
• WAVE — Wide Area Voice Exchange
• BT — Busy Tone
• DDCZ — Daily Demand Charge for a Zone
• AMT — Australasian Mobile Telecommunications
• TBPS — terabit per second
• DHA — Dialogue Handling
• WIAS — Wholesale Internet Access Services
• THL — Trans-Hybrid Loss
• ECP — Exchange Control Panel
• RCV — ReCharge Voucher
• TI — Time Integration
• SCAT — Single Channel Autonomous Trunking
• STEREO — Solar Terrestrial Relations Observatory
• MJT — Modular Jack Terminal
• A — All lines
• WID — Wireless Information Device
• AT — Access Terminal
• ASC — Available Spare Capacity
• AUBW — AutoBot Walkthrough
• WTDC 2003 — World Telecom Development Conference 2003
• IVW — InfoView Wireless
• CDF — Communications Data Field
• TOT — Time Of Transmission
• BANC — Broadband Access Network Coordination
• FFM — First Failure to Match
• MED — Manipulative Electronic Deception
• SUF — Service Update Facility
• AAC — Alternate Area Code
• HTU-C — HDSL (High-bit-rate Digital Subscriber Line) Transmission Unit - Central office
• WTDC 98 — World Telecom Development Conference 1998

• LQN — Line Quality Network
• CQ — Communications Quality
• WITS — Washington Interagency Telecommunications System
• ESP — Essential Service Protection
• VVD — Voice and Video Data
• CIS — Communications and Information Systems
• C — Clock
• MFN — Multiple Frequency Network
• L4 — Layer 4
• SINAP — Signalling and Intelligent Network Applications Platform
• TNS — Time to Next Send
• PTN — Portable Telephone Network
• RSU — Remote Switching Unit
• CS — Connection Segment
• KSR — Key Send Receive
• RTZ — Rate for Transmission service for a Zone load
• STDM — Statistical Time Division Multiplexing
• WOS — Wireless Optimization Service
• SKT — Sun Kyung Telecom
• DTF — Dial Tone First
• ITF — Information Transport Function
• SPH — Samsung PHone
• VDT — Video Dial Tone
• EFRC — Enhanced Full Rate Codec
• RCDD — Registered Communications Distribution Designer
• WCB — Wireline Competition Bureau (FCC)
• OC-12 — Optical Carrier Signal, Level 12
• CCS — Centa- (hundred) Call Seconds
• UPR — User Performance Requirement
• WWA — Wireless Web Application
• SCSA — Standard Consolidated Statistical Area
• WDCS — Wireless Distributed Communication System
• LOSW — Loss Of Synchronous Word
• MSID — Mobile Station Identity
• ESL — Educational Sales Ledger
• CBS — Common Battery Signaling
• TED — Triteal Enterprise Desktop
• RXD — Receive Data
• LCN — Local Channel Number
• TWC — The Weather Channel(r)
• ECR — Enhanced Call Routing
• OOR — Operator Override
• HTU — HDSL (High-bit-rate Digital Subscriber Line) Transmission Unit
• WRU — Wireless Receiver Unit
• DS-1C — Digital Stream 1C (3.152 mbps)
• PTFP — Public Telecommunications Facilities Program
• TIMS — Transmission Impairment Measurement System
• IVI — Intel Video Interactive
• IWCS — Integrated Wideband Communications System
• ATM — Automated Transmissions Machine

• DLI — Dialed Line Identification
• CTSO — Cellular Telephone Service Order
• IESS — INTELSAT Earth Station Standard
• CK — Check Bit
• HOMEPNA — Home Phoneline Networking Alliance [also HomePNA2]
• C/R — Control/Response indication bit
• DLOL — Digital Loss Of Link
• MDU — Monthly Domestic Usage
• DUC — Designated Underlying Carrier
• WITS — Web Interface for Telescience
• VSM — Voice Service Module
• DSP — Domain Specific Part
• ZPD — Zero-Plus Dialing
• BBCR — BroadBand Communications Research
• MEO — Middle-Earth-Orbit
• MFAS — Multi-Frame Alignment Signal
• LLAR — Local Loop Access Ring
• SSCOP — Service Specific Connection Oriented Protocol (ATM)
• BRQ — Bandwidth Request
• CTN — Corporate Telecommunication Networks
• DCH — Discrete CHannel
• WMA — Wireless Messaging API (Application Programming Interface)
• JYP — Jamaican Yellow Pages
• CO — Central Operations
• MUF — Maximum Useable Frequency
• RDI-P — Remote Defect Indicator - Path
• ESSE — Embedded Systems Software Environment
• OM — operations management
• SRS — Supported Residential Services
• DCD — Data Carrier Detect
• CEPT — Committee of European Postal & Telephone (authorities)
• BIT — Bureau of Information and Telecommunications
• D/U — Delay Unit
• WIDS — Wireless Intrusion Detection Sensor
• CTNS — Certified Telecommunications Network Specialist
• ETT — Emona Telecoms Trainer
• DQR — Directory enQuiry Restricted
• CCSD — Cellular Circuit Switched Data
• SSS — System/segment Specification
• TEDP — Telecommunication Equipment Distribution Program
• YBY — Why Be Yellow
• SWF — SWitched Fractional
• ILQ — Inbound Link Quality
• SQM — Signal Quality Manager
• SHM — Short-Haul Modem
• BCM — Bit Compression Multiplexer
• T — Tip
• DNI — Did Not Include
• MM — Multimode (fiber optic cable)
• MBCM — Multiple Block-Coded Modulation

• WIPA — Walkup Internet Port Authentication
• CID — Cell IDentification number
• SWN — Statewide Wireless Network
• NTON — National Transparent Optical Network
• WTPF 3 — World Telecommunication Policy Forum 3
• FERF — Far-End Receive Failure
• PTO — Public Telephone Operator
• IWE — Institute for Wireless Education
• UMS — Unified Messaging Service
• ROPP — Receiver Only Packet Pair
• TSIP — Telecommunications System Installation Plan
• AMP — amplifier / amplification
• OCTS — Ocean Color and Temperature Scanner
• TRK — Trunk
• TOM — Telecom Operations Map
• LETS — Line Efficiency Tracking System
• PN — Public Network
• SSP — Service Switching Point
• COIC — Central Office Interface Circuit
• CTE — Computer Telephony Engine
• ENST — Ecole Nationale Supérieure des Télécommunications
• DSVT — Digital, Secure Voice Telephone
• HIC — Head-End Interface Converter
• O — Optical
• STP — Shielded Twisted-Pair
• TVR — Telephone Voice Response
• ITV — Instructional Telecommunications And Video
• SC — Standards Committee
• SPN — Service Panel Number
• AA — Agile Access
• ITU-R — International Telecommunication Union-Radiocommunications
• E&M — Earth and Magneto (signaling leads)
• DMF — Distributed Messaging Fabric
• VF0 — Voice Fundamental Frequency
• ONE — Other Network Entity
• WL — Wire Line
• COMS — Cambridge Open Mobile System
• KTA — Kentucky Telecom Association
• DVCC — Digital Verification Color Code
• INSAT — India's Indian National Satellite
• SPA — Service Planning Area
• TTGS — Test Tone Generator Software
• WTR — Wireless Token Ring
• GSA — Guarded Single Assignment
• IS — Integrated Services
• CDO — Community Dial Office
• JTU — Japan Telephone Upgrade
• LSOA — Local Service Order Administration
• INPT — Institut National des Postes et Télécommunications
• ITEC — Internet Telecom and Electronic Commerce

• TIBS — Tactical Information Broadcast Service
• BASH — Bandwidth Sharing
• ERMES — European Radio Message System
• MCF — Message Confirmation Frame
• CTIE — Centre for Telecommunications and Information Engineering (Monash University; Australia)
• TTTN — Tandem Tie Trunk Network
• ASE — Accredited Systems Engineer
• CELL — Caller Enabled Leased Line
• VRSP — Voltage, Ringing Signal Positive
• ETET — Electrical and Telecommunications Engineering Technology
• GT&T — Guyana Telephone and Telegraph Company
• TSSI — Telecom Switched Services Interoperability
• HCT — Hierarchical Cellular Tree
• SEE — Software Engineering Environments
• VMB — Voice Mail Box
• WISI — Wireless Integrated Strike Interface
• OC-192 — Optical Carrier Signal, Level 192
• LL — Lower Layer
• WXE — Wireless Exchange Engine
• MVPRP — Multivendor Problem Resolution Process
• TANE — Telephone Association of New England
• ACG — Automatic Code Gapping
• CTN — Community Telecommunications Network
• WUA — Wireless USB (Universal Serial Bus) Adapter
• ICC — Interexchange Carrier Charge
• WTRP — Wireless Token Ring Protocol
• AIOD — Automatic Identification of Outward Dialed calls
• OE — Originating Equipment
• ESG — Error Satellite Gauge
• SPCS — Stored Program Control System
• QIC — Quality Improvement Council
• TMOD — Telecommunications and Mission Operations Directorate
• CMP — Connection Management Procedures
• AA — Audit Agent
• WTDC 2002 — World Telecom Development Conference 2002
• ANCD — Automatic Network Call Distrubution
• TINA — Telecommunications Information Networking Architecture
• WND — Wireless Network Design
• DI — Document Index
• JTRS — Joint Tactical Radio Systems
• X25 — A Packet Switching Protocol
• TEM — Telecommunications Expense Management
• OC-36 — Optical Carrier Signal, Level 36
• ETC — Enhanced Telecommunications Corporation
• VTE — Virtual Test Environment
• LADT — Local Area Data Transport
• SWANSAT — Super-Wide Area Network SATellite
• LAP-D — Link Access Protocol-D channel
• UBI — Usage Billing Information
• ITTP — Information Technology And Telecommunications Policy

• CSA — Central Service Area
• ISD — Instructional Systems Designers
• PICS — Protocol Implementation Conformance Statement
• MTS — Message Telecommunications Service
• NSK — Nonstop Kernel
• WWVC — WorldWide VideoConferencing
• STE — Signaling Terminal Equipment
• DLS — Dual Line Signalling
• IMTC — International Multimedia Telecommunication Consortium
• TAMS — Telecom Analysis and Management System
• MTS — message transport system
• CSI — Clearing Subnetwork Identification
• SM — Statistical Multiplexing
• ACS — Accelerated Change Service
• DDCNZ — Daily Demand Charge for Non-Zone Network Load
• UBT — Universal Backend Tester
• EPI — External Provisioning Interface
• WTB — Wanted to buy
• WNM — Wireless Network Management
• AA — Automatic Answer
• AGRAS — Air-Ground Radiotelephone Automated Service
• MM — mismatch
• WTF — Wireless Telecommunications Facility
• CMS — Circuit Multiplication System
• CSF — Common Service Framework
• FELB — Far-End Loop Back
• WTNP — Wireless Telephone Number Portability
• WLS — Wireless Location Services
• CMP — Communications Module Processor
• CD — Carrier Detect
• WSNN — Wireless Sensor Network News
• CMM — Calls, Minimums, Maximums
• TSG — Test Signal Generator
• SCC — Signal Conversion Circuit
• RNW — Radio NetWork
• RFI — Remote File Inquiry
• NTSA — Networking Technical Support Alliance
• ROF — Reformat on the Fly
• DS-4 — Digital Stream 4 (274.016 mbps)
• JICC — Justice International Calling Card
• ZUD — Zero Unscheduled Downtime
• BLERT — Block Error Rate Test
• OTM — Object Transaction Manager
• HSC — High Speed Connect
• UMATS — University of Maryland Academic Telecommunication System
• WORP — Wireless Outdoor Router Protocol
• WVI — Wireless Vehicle Interface
• MEAS — Measurement Specialties, Inc.
• LWT — Listen While Talk
• ALIT — Automatic Line Insulation Test

• DSX-2 — Digital Stream Crossconnect 2 (6.312 Mbps)
• ECTEL — Eastern Caribbean TELecommunications Authority
• APOT — Access Point Of Termination
• IMN — Intelligent Mobile Network
• TR — Temporal Reference
• ESVN — Executive Secure Voice Network
• FSM — Field Service Manager
• DPO — Dial Pulse Originate
• B911 — Basic 911 Emergency Service
• RAMA — Resource Auction Multiple Access
• LMC — Loop Maintenance Center
• ATLAS — Accessing Telecoms Links Across Scotland
• DEN — Directory Enabled Networks
• BAC — Bar Calls
• UCS — Unified Communication Service
• WLRL — Wireless LAN (Local Area Network) Research Laboratory
• QNS — Questar Network Services
• WNT — Windows NT
• PCTF — Per-Call Test Failure
• ATSC — Australian Telecommunications Standardization Committee
• NSSG — Network Solutions and Service Group
• RWF — Roaming Wireless Framework
• TAPS — TELEPHONE APPLICATION PROCESSING SYSTEM
• RFA — Recurrent Fault Analysis
• ICAL — Interexchange Carrier Access Line
• BIPT — Belgian Institute for Post and Telecommunications
• PIN — Positive-Intrinsic-Negative
• ICR — Intelligent Call Routing
• WIOP — Wireless Inter-ORB (Object Request Broker) Protocol
• TLX — TELEX (TELegraph EXchange)
• MEAS — Measured Extended Area Service
• DLC — Digital Line Controller
• DSS — Digital Switching Subsystem
• TWSS — Telecom Web Services Server
• DSS — Digital Subscriber Signalling
• EDGE — Enhanced Data for GSM Evolution
• HOPA — Higher-Order Path Adaptation
• T3 — 44.736 Mbits per Second line
• SYNC — Synchronous
• SYNTRAN — Synchronous Transmission
• TESP — Telecommunications Enterprise Strategic Program
• PTCM — Pragmatic Trellis-Coded Modulation
• MBA — Masters in Business Administration
• DTIS — Department of Telecommunications and Information Services
• CS — Customer Specification
• NIMA — National Imagery Mapping Agency
• PNA — Parallel Network Architecture
• IDM — Interim Data Modem
• SDK — Service Development Kit
• ENFIA — Exchange Network Facilities for Interstate Access

• TCCL — Terminating Carrier Command Line
• DP — Drop Point
• CDR — Common Data Rate
• DLIS — Directory Listing Inquiry System
• LMOS — Loop Maintenance Operations System
• MGW — Mobile GateWay
• VOIPTXT — Voice over Internet Protocol Text
• URM — Uniform Redial Model
• TVL — TELECOM VANUATU LIMITED
• RTP — Research Triangle Park
• MNET — Minnesota's Network for Enterprise Telecommunications
• UMTS — Universal Mobile Telecom Surfwax
• CHE — Central Head-End
• RU — Remote Unit
• WWOM — Wireless Work Order Management
• USLD — United States Long Distance
• WUF — Wireless University Forum
• CSS — Customer Service System
• TE — Thermoelectric
• UGC — UnderGround Communications
• UNICODE — UNIversal trunk - out-of-service CODE
• DS-1 — Digital Stream 1 (1.544 mbps)
• COCOT — Customer Owned Coin Operated Telephone
• WUPE — Wireless User Premises Equipment
• WDL — Wireless Device License
• OC-24 — Optical Carrier Signal, Level 24
• LDC — Long Distance Carrier
• AOS — Alternative Operator Services
• OTA — Over-the-Air Activation
• COSMIC — common systems main interconnecting
• CN — Calling Number
• ELL — Ethernet Leased Line
• OMP — Operations and Management Platform
• TEM — Telecom Expense Management
• WACS — Wireless Access Communications System
• AC — Always Connected
• BR — Basic Rate
• ADTN — Agency Data Telecommunications Network
• DIAG — Diagnostics
• CHM — Changeover and Changeback Messages
• WDP — Wireless Data Pool
• DSRF — Device Savings Recovery Fee
• BEP — Back-End Processor
• TSB — Telecommunications Systems Bulletin
• RTNR — Real-Time Network Routing
• T3 — Transmission service at the DS3 rate of 44.736 Mbps
• WCPE — Wireless Customer Premises Equipment
• TDP — Tag Distribution Protocol
• RBES — Rule-Based Expert Systems
• WIT — Wireless Image Transfer

• ITSP — Internet Telephone Service Provider
• HFK — Hands Free Kit
• DMB — Digital Multimedia Broadcasting
• ISD — Independent Segment Decoding
• CMI — Computer Managed Instituteuction
• SLTE — Signaling Link Termination Equipment
• ADU — Accumulation and Distribution Unit
• TRNA — Temporarily Restricted Net Asset
• TVL — Telecoms Virtual Library
• RATS — Radio-Amateur Telecommunications Society
• ADLI — Automatic Dial Line Identification
• QCIF — Quarter Common Image Format
• NCOSE — National Council on Systems Engineering
• SAC — Syntax-based Arithmetic Coding
• RIC — Radiocommunications Information Circular
• MDCNZ — Monthly Demand Charge for Non-Zone network Load
• MAP — Mobile Applications Port
• CI — Customer Installation
• PRAM — Parameter RAM
• CPP — Calling Party Pays
• DNMS — Dual Network Media Server
• TPE — Telephony Platform Engine
• SM-SC — Short Message Service Center
• FCOT — Fiber Central Office Terminal
• UNL — Unlisted
• IRTC — Illinois Rural TeleCommunication
• ITTC — Information and Telecommunication Technology Center
• PSU — Packet Switching Unit
• SCM — Service Class Mark
• TMN — Telecommunications Management Network
• UTL — United Telecom Limited
• T1 — Transmission service at the DS1 rate of 1.544 Mbps
• CRACK — Challenge Response for Authenticated Crypto Keys
• FOTP — Fiber Optic Test Procedures
• LVC — Label Virtual Circuit
• TU — Total Usage
• IVAD — Integrated Voice and Data
• ADU — Analog-to-Digital Unit
• CSL — Communication Services Limited
• VRSP — Video Relay Service Provider
• IDR — Installer Design Required
• WDDM — Wavelength-Division Demultiplexing
• TLS — Telephone Line Simulator
• FCA — Fixed Channel Assignment
• NOLM — Nonlinear Optical Loop Mirror
• NB — Narrowband
• DSX-3 — Digital Stream Crossconnect 3 (44.736 Mbps)
• WISE — Wireless Infrastructure Simulation Environment
• GLD — German Long Distance
• SLC — Subscriber Loop Carrier

• VDS — Variable Department Sonar
• LOP-L — Loss Of Pointer - Line
• TSAPI — Telephony Services Application Programming Interface
• WLS — Wait Listing Service
• VSR — Viking Single-line loud Ringer
• KLM — Keyboard Layout Management
• CASE — Common Application Service Elements
• RI — Ring In
• SCS — Signal Collection System
• RWI — Real Wireless Intelligence
• SLS — Sidelobe Suppression
• EICS — EURESCOM Information and Communications Services
• UTFX — Unit Testing Framework - XSLT (Extensible Stylesheet Language Transformation)
• RWN — Regional Wireless Networks
• M — Maintenance (Job Status)
• VMIC — VME Microsystems International Corporation
• WEPD — Weighted Early Packet Discard
• SWAN — Structured Wireless Aware Network
• IA5 — International Alpha Set No. 5
• DCPZ — Daily withdrawal coincident with Customer Peak for a Zone
• BASH-R — BAndwidth SHaring with Resource constraints
• AS56 — Access System Centum 56 series
• RATS — Richmond Amateur Telecommunications Society
• JIS — Jurisdictional Interstate Service
• HPNA — Home Phoneline Network Adapter
• GTTI — Global Telecommunication Training Institute
• VRSM — Voltage, Ringing Signal Modified (inverted)
• ESMR — Enhanced Specialized Mobile Radiotelephony
• OC — Output Controller
• RTDC — Regional Telecommunication Development Conference
• CS — Communications Satellite
• EVRC — Enhanced Variable Rate CODEC (CODer-DECoder)
• CS — Clear to Send
• ISM — Instrumentation Scientific and Medical
• WCS — Wireless Communications Service
• PVRA — Physical Volume Reserved Area
• RAPID — Remote Access Protocol Interface Device
• RACE — Research for Advanced Communications in Europe
• UPPC — Up-Path Power Control
• MFR — Multi-link Frame Relay
• XNS — Xerox Network System
• CEP — Communication End Point
• GETS — The Government Emergency Telecommunications Service
• EA — Emergency Action (JOC)
• WWTW — World Wide Telecom Web
• WACR — Wide Area Call Reception
• IVDT — Integrated Voice/Data Terminal
• BC — Committed Burst Size
• TOSL — Telecommunications Ombudsman Service Limited
• VCE — Voice Clarity Enhancement

• E-911 — Enhanced emergency telephone number
• TTAC — Telecommunication Technology Advisory Committee
• LQE — Line Quality Engineering
• FWT — Fixed Wireless Terminal
• ESFDL — Extended Super Frame Data-Link
• WNQS — Wireless Network Quality Specification
• WIVA — Wireless Integrated Voice Access
• WRRK — Wireless Router and Repeater Kit
• ITS — Institute for Telecommunication Sciences
• IUC — Interconnect Usage Charge
• RAST — Receive and Send Terminal
• SDB — Switched Digital Broadcast
• WHM — Wireless Host Module
• CMRS — Commercial Mobile Radio Services
• OHD — Optical Heterodyne Detection
• GTSS — Global Telecom Solutions Sector
• SCC — System Control Center
• WACM — Wide Area Communications Management
• NCP — Network Control Point
• TBR — Tagged Bit Rate
• WIPN — Wireless Internet Protocol Network
• ECG — English Cell Group
• IDDD — International Direct Distance Dialing
• WTRS — Wisconsin Telecommunication Relay System
• VFM — Voice Frequency Measurement
• CERN — Centre Europйen de Recherche Nuclйaire
• VAC — Voice Activity Compression
• LAPD — Link Access Procedure D channel
• LDL — Long Distance Link
• BLERT — BLock Error Rate Tester
• CCF — Custom Calling Feature
• SIT — Special Information Tone
• ISUP — ISDN Service User Part
• VIDF — Vertical Intermediate Distributing Frame
• PNVS — Pilot Night Vision Sensor
• VCC — VSAT (Very-Small-Aperture Terminal) Control Center
• THT — Total Handling Time
• WLN — WireLess Networking
• KEY — Keyset (multiline phone)
• LEO — Low-Earth-Orbit
• PTP — Personal Telco Project
• DIP — Dialup Internet Protocol
• UG — User's Group
• FO — Fiber-Optic
• ECHI — External Call History Interface
• WBE — Wireless Business Engine
• ITW — International Telecoms Week
• RLDI — Receive Line Data Input
• IR — Information Rate
• ASR — Automatic Send-Receive

• TXE — Transmitter Empty
• NAB — National Association Of Broadcasters
• SDN — Software-Defined Network
• MIS — Mobile Information Service
• LQI — Line Quality Indicator
• MDCZ — Monthly Demand Charge for a Zone
• KTL — Killarney Telecommunications Ltd
• EOC — Embedded Operations Channel
• BETAG — Beginning-End Tag
• FA — Failed Answer
• CBO — Call-Back Only
• YLT — Your Local Telecom
• VRR — Videoconferencing Reservation Request
• WEXK — Wireless EXit Kit
• WN — Wireless Network
• BLT — Bottom Line Telecommunications
• NEBS — New Equipment Building Specifications
• ISC — Information Systems Council
• DV — Data and Voice
• MCFI — Multiple number Call Forwarding Inhibit
• THAAD — Theater High Altitude Area Defense
• DMS — Digital Multiplex Switch
• TMT — Technology, Media, and Telecommunications
• ICS — Intelligent Calling System ID Identification
• ASR — Automatic Set Relocation
• WWAT — Wireless Wide Area Telemetry
• CNA — Cell Not Available
• ACIS — Andy Charles Ians System solid modelling geometric engine
• AZDL — Adjusted Zonal Daily Load
• CFU — Call Forward Unconditionally
• PAL — Phase Alternating by Line
• WTNG — World Telephone Numbering Guide
• MND — Multi-Number Dialer
• BTS — Business Telecommunications Services
• MLC — Multiple Level Cell
• RWL — RF (Radio Frequency) / Wireless Laboratory
• TTE — Telecommunications Terminal Equipment
• VMLA — Virtual Mobile Location Area
• TSY — Telephony Server
• WBCS — Wireless Business Communications Systems
• UCP — Universal Communications Platform
• SU — super-user
• ERA — Enhanced Remote Access
• SHOE — Simple Hypertext Ontology Extensions
• HIDF — Horizontal Intermediate Distributing Frame
• MBA — Message Body Authenticator
• MDC — Monthly Demand Charge
• MOM — Mainboard Operation Monitor
• CFA — Carrier Failure Alarm
• TGPSI — Transmission Gap Pattern Sequence Identifier

• WPA — WiFi Protected Access
• WNA — Wireless Network Adapter
• STA — State Transport Authority
• RRO — Regulated Rate Option
• BYOP — Bring Your Own Portal
• DA — decanoic acid
• WNRC — Wireless Networks Research Center
• ADSRF — Additional Device Savings Recovery Fee
• BT — British Telecom…
• DUITS — Digital, Ubiquitous, Interoperable, Transparent and Secure
• CWC — Center Weight Control
• FCAPS — Fault, Configuration, Accounts, Performance, Security
• RI — Ring Interface
• XA-SMDS — Exchange Access Switched Multi-Megabit Data Service
• TIF — Telecommunications Infrastructure Fund
• UARS — Upper Atmospheric Research Satellite
• DCAT — DSL (Digital Subscriber Line) Customer Advocacy Team
• TTK — Telephone Travel Kit
• TMAP — Technical Management Assistance Programme
• ACC — Automatic Carrier Control
• RTSE — Remote Transfer Service Element
• BDS — Bundled Digital Services
• RTX — Real Telephone eXchange
• SRU — Single Receiver Unit
• SS#7 — Signaling System # 7
• EMX — Earth and Magneto Signaling
• CTUF — Cape Telecommunications Users Forum
• TCM — Tandem Connection Maintenance
• DF — Data Frame
• VQR — Voice Quality Rating
• ARE — All Routes Explorer
• UTRA — Universal Terrestrial Radio Access
• ITNL — Indusind Telecom Network Ltd
• NE — Network Entity
• WON — Wireless Optical Network
• CSL — Create a Simple Life
• WTCP — Wireless Transport Control Protocol
• FUNI — Frame (relay) User Network Interface
• VWO — Virtual Wire Operations
• LAS — Local Authentication Service
• SPC — Service Provider Code
• WHAT — Wireless Hybrid Asynchronous Time-bounded
• TELCO — Telecommunications Company
• WAP — Wireless Access Provider
• SATRA — A Saudi Arabian Telecommunications Regulatory Authority
• STPI — Stentor Telecom Policy, Inc.
• DCN — Data Communications Network
• WLAR — Wireless LAN (Local Area Network) Access Repeater
• SNA — Systems Network Architecture
• SRB — Software Release Bulletin

• RES — Resident
• TLWS — Trunk and Line Work Station
• VT — Virtual Tributary signal
• RBHC — Regional Bell Holding Company
• TOH — Transport Overhead
• PCL — Product Computing Module Load(s)
• UI — Unnumbered Information (frame)
• IRMA — Interactive Remote Messaging Application
• BT — Bluetooth Two
• NCA — Non-Call Associated
• WRI — Wireless Reader Interface
• ECS — Emergency Communication System
• COPS — Caring Operators Personal Service
• CDM — Code Division Multiplexing
• IWW — Internet World Wireless conference
• NN — node number
• RPS — Reference Picture Selection
• WICD — Wireless Interface Connection Daemon
• TSP — Telecom Service Provider
• WIAD — Wireless Integrated Access Device
• PAD — Packet Assembler-Disassemble
• VTPM — Virtual Terminal Protocol Machine
• WTIS — Wireless Telecommunications Information & Services
• DT — Dial Tone
• H0 — High-capacity ISDN channel operating at 384 kbps
• ATP — Association of Telecom Professionals
• WRAN — Wireless Rural Area Network
• NETS — Nationwide Emergency Telecommunications Service
• FFC — Front-Facing Camera
• AMSI — Ameritech Message Signal Interface
• DLT — Double Leading Tone
• MFT — Metallic Facilities Terminal
• WMTS — Wireless Medical Telemetry Service
• SMDF — Subscriber Maintenance Distributing Frame
• TXC — Transmission Complete
• DNA — Daytime Nighttime Anytime
• AC — Armored Cable (electricity)
• VMB — Voice Message Broadcasting
• AHT — Average Holding Time
• VPLS — Virtual Private LAN (Local Area Network) Service
• CF — Coin First
• WQOS — Wireless Quality of Service
• BRITE — Basic Rate Interface Transmission Extension
• IPOD — Internet Phone Over Data
• CSP — Callback Service Provider
• WTDC — World Telecommunications Development Conference
• CVSD — Continuously Variable Slope, Delta modulation
• GDS — Generic Digital Services
• SPTC — Swaziland Post and Telecommunications Corporation
• DCPNZ — Daily transmission Charge for Peak Non-Zone network load

• TELEX — Teleprinter Exchange
• AM — Advance Mobile
• HLB — Hierarchical Line Balancing
• ANP — Autonomous Network Planning
• T1 — 1,544 Mbits per Second line
• MPPP — Multilink Point-to-Point Protocol
• DUNC — Dial-Up Networking Connection
• CFO — Core Funded Organization
• WNP — Wireless Number Portability
• UDTX — Universal Data Transceiver
• SS7 — Signalling System 7
• WIXD — Wireless Internet eXpress Data Connection
• DCR — Dropped Call Rate
• ULQ — User Level Quality
• WMTP — Wireless Messaging Transfer Protocol
• VMAC — Voice Mobile Attenuation Code
• RCE — Region Code Enhancement
• ISBX — Internet Satellite Broadcast Exchange
• WBT — Wireless Business Technology
• DCT — Digital Cordless Telecommunications
• CTI — Computer Telephone Integration
• DCU — Drum Control Unit
• WTPF — World Telecommunication Policy Forum
• TL1 — Transaction Language One
• RASC — Radio Access System Controller
• UNS — Universal Numbering System
• CPEB — Channel Partner Enablement Briefing
• ZFH — Novell ZENworks For Handhelds
• TLC — Text Link Cellular
• VQC — Vector Quantizing Code
• CS — Carrier Sense
• RHE — Regional Head-End
• EDGE — Edhanced Data Rates for Global Evolution
• WDCX — Wideband Digital Cross-connect
• APS — Affordable Portable Services
• EUCL — End User Common Line
• CNA — Certified Novell Administrator
• MMF — Microsoft Mail File
• EQ — Equal To
• DRS — Dial Return System
• MJC — Modular Jack Cable
• ATZ — Attention: Reset modem
• TPC — Transmit Power Control
• RLCI — Receive Line Clock Input
• WCIT — World Conference on International Telecommunications
• WGIS — Wireless Geographical Information System
• QRW — Quasi-Random Word
• RGC — Resource-Guaranteed Connection
• IRB — Instituteuction Reorder Buffer
• DAP — Demand Access Protocol

• RII — Routing Information Indicator bit
• TSD — Transmission System Development
• VON — Voice Over Network
• SLTS — Sri Lanka Telecom Services
• RAT — Radio Access Technologies
• RTRP — Regional Telecommunications Restructuring Project
• BCP — Before Cell Phones
• WTS — Wireless Telecommunication Services
• AIP — Administrative Installation Point
• WAP — Web Access Phone
• HCF — High Connection Failure
• WPMS — Wireless Protocol Management System
• RITS — Residential Information Technology Services
• FOB — Forward on Busy
• SVC — Signaling Virtual Channel
• MMT — Multimedia Multiparty Teleconferencing
• WADS — Wireless Access Development System
• WTEL — Wireless TELephony
• RYC — Returned Your Call
• IAST — Industry Access Service Tariff
• ULSI — Ultra Large-scale Integration
• HSOPA — High-Speed OFDM (Orthogonal Frequency Division Multiplexing) Packet Access
• GTA — GEORGIA TELECOMMUNICATIONS ASSOCIATION
• EB — Expanded Basic
• TETRA — Trans-European Trunked RAdio
• SS2 — Signalling System 2 (600/750 Hz tones)
• FSS — Fixed Satellite System
• PTC — Pots Tandem Centrex
• ASLV — Augumented Satellite Launch Vehicle
• VSP — VoIP Service Partner
• RWT — Receiver Wait Time
• WCFQ — Wireless Credit-based Fair Queueing
• IVD — Integrated Voice and Data
• CTS — Cordless Telephone System
• RZ — Receive ZModem
• WACP — Wide Area Calling Plan
• LDDS — Limited Distance Data Service
• STN — Satellite Telecommunications Networks
• UL — Upper Layer
• THP — Terminal Handler Process
• GAT — GSM, AMPS, and TDMA
• VCA — Voice Communications Adapter
• DB — Dial Back
• PIC — Pre-Subscribed Interexchange Carrier
• CID — Call Instance Data
• PSN — Personal Subscription Number
• AT — ATtention command
• WBIA — Wireless Broadband Internet Access
• IFLS — Inter-Frequency Load Sharing
• OTD — Open Terminal Directive

• EPSCS — Enhanced Private Switch Controlled System
• UNE-P — Unbundled Network Element - Platform
• MAP — Management Assessment Program
• WNRL — Wireless Network Research Laboratory
• CRA — Constant Rate Allocation
• WSI — Wireless Services Integration
• RPE-LTP — Regular Pulse Excited - Long Term Prediction
• BSM — Broadband Satellite Multimedia
• SCRG — Servicing Carrier Reference Guide
• LSP — Local Support Provider
• CNA — Called Number Authority
• WNIU — Wireless Network Interface Unit
• SDP — Service Definition and Provisioning
• VMW — Vertically Modulated Well
• CTWU — Chunghwa Telecom Workers' Union
• CAPS — Common ISDN API Service
• T2R — Trusted Transaction Roaming
• WLTG — Wireless LAN (Local Area Network) Technology Group
• WTSF — Wireless Telecommunication Services Facilities
• SSD — Source-surface Distance
• WCM — Wireless Connection Manager
• USPRO — United States Product Data Association
• ACF — Admission Confirm
• SRP — Spatial Reuse Protocol
• BGSA — Banded Geographical Service Area
• SDTA — South Dakota Telecommunications Association
• TISM — Telecommunication, Information Studies and Media
• XDSL — x (any type of) Digital Subscriber Line
• TIRKS — Trunk Integrated Records Keeping System
• TSA — Terminating Switched Access
• T — Tipper
• P — Planning
• SHIT — Single-Hop Infrastructure Transmission
• ARP — Access Responsible Party
• TIC — Talking In Confidence
• WNA — Wireless Network Auburn
• IMS — IP (Internet Protocol) Multimedia Subsystem
• CF — Call Forward
• BCDMA — Broadband CDMA
• MFRM — Multi-carrier Flexible Radio Module
• TSAPI — Telephony Server Application Programming Interface
• ICE — Information Content Exchange
• RPS — Really Poor Service
• VYP — Virtual Yellow Pages
• DA — Dodecanedioic Acid
• WAVE — Wireless Audio Visual Email
• ACD — Apex Collaborative Dialing
• WPMS — Wireless Pay phone Management System
• WIGLE — Wireless Geographic Logging Engine
• RTPB — Residential consumer Third Party Billing

• RDY/BSY — Ready/Busy
• DCCX — Direct Circuit Control Exchange
• UWT — United World Telecom
• CD — Channel Delay
• RANN — Recorder ANNouncer
• CSM — Communications Services Management
• ZDL — Zonal Daily Load
• WNL — Wireless Networks Laboratory
• WECM — WebSphere Everyplace Connection Manager
• ET — Emerging Technologies
• WLAB — Wireless LAN (Local Area Network) Access Bridge
• M-LEAD — Mouth Lead
• WNPO — Wireless Number Portability Operations subcommittee
• TDR — Transaction Data Reports
• WGS — Worldwide Geodesic System
• TRF — Transmit Reject Filter
• NMS — Network Management Service
• SWNI — Smart Wireless Network Interface
• WWO — Wireless Work Order
• DPE — Dollar Phone Enterprise
• LE — Line Encryption
• DOS — data over signaling
• VMUI — Voice Mail User Interface
• TW — TWinbrook (telephone exchange)
• WDDF — Wireless Data Delivery Function
• NAS — North American Standard
• MLP — Multi-layer Perception
• SFS — Start of Frame Sequence
• DD — Digit Directory
• PTCL — Pakistan TeleComunication Land-line
• GWCS — General Wireless Communications Service (46560 - 4685 MHz)
• WIMC — Wireless Intelligent Mobile Communicator
• EUS — End User Segment
• APTG — Amplifier Probe and Tone Generator Kit
• WOSN — Wireless Optimization Service Node
• SNECS — Single National Emergency Call System
• SPV — Sound, Picture, Voice
• WCTG — Wireless Communications Technologies Group
• VTAC — Vermont Telecommunications Application Center
• WNE — Wireless Network Experiment
• TUMS — Telephone and Utilities Maintenance System
• F — Flowability
• ET — Exchange Termination
• UNP — UN-Published
• IKI — Institut Kosmitcheskikh Issledovanii
• VNT — Very Nice Telephone
• USITA — United States Independent Telephone Association
• WICI — Wireless Innovations in Communications Initiative
• WWJ — Wireless Watch Japan (est. 2001)
• CC — Connection Confirm

• WFII — Wireless Facilities Information Infrastructure
• DP — Dial Pulsing
• RSS — Remote Switching System
• RACE — Research into Advanced Communications in Europe
• SSS — Switching Subsystem
• SSP — Secure Service Provider
• SWF-DS1 — SWitched Fractional Digital Signal 1 line
• EMS — Element Management Service
• VPF — Virtual Private Facility
• DC — Dry Circuit
• WTFB — World Telecoms Financial Benchmarks
• IPD — Intelligent Pulse Decoding
• ALS — Alternative Line Service
• NCSU — North Carolina State Universityrsity
• ATR — Advanced Telecommunications Research laboratory
• ITC — Interstate Telecommunications Cooperative
• SLT — Signaling Link Termination
• AV — AUTOVON
• XI — X Identification (frame)
• UMTS — Unified Mobile Telecommunication System
• LQF — Line Quality Function
• VMY — Voice Mobility
• TNS — Telephone Notification System
• RSS — Remote Switching Sites
• HBOS — High-Bandwidth Optical Services
• TICS — Telecommunications And Instructional Computing Support
• CSP — Custom SIM Profile
• TMAB — Telecom Managers Association of Belgium
• CMM — Cable Management Module
• TTX — TeleTeXt
• VODAFONE — Combined Voice, Data, Telephone:
• WNI — Wireless Network Interface
• TLC — Telecommunication Link Controller
• TELECOMMUTE — Telecommuters
• IMM — Interactive Mobile Media
• TCA — Telecom Computing Architecture
• VINF — Vista INformation Solution
• SN — Station Number
• IDDD — International Direct Dialing Designator
• RCS — Radio Cluster Server
• CD — Connect Direct
• CPI — Computer-PBX Interface
• SLIM — Service Level Improvement Method
• BC — Burst copy
• WNAR — Wireless Network Access Requirements
• RTE — Run-Time Environment
• WP7 — Windows Phone 7
• HTI — Handoff Transfer Initiate
• APTG — Academy for Professional TraininG
• SS — Single Step

• DFA — Distribution Feeder Antenna
• SP — Single Purpose
• WLIA — Wireless Location Industry Association
• SCAYNP — Someone Calls And You No Pay
• FDS — Filtering, Distributing, and Serving
• DCPV — Daily Customer Pool Volume
• WLSM — Wireless LAN (Local Area Network) Springboard Module
• R — Rimorchio (trailer)
• TBQ — Telecommunications Billing Question
• CENTREX — Central Office Exchange
• SMI — Subsystem Multiplicity Indicator
• WTAI — Wireless Telephony Applications Interface
• ISA — Innovative Slot Allocation
• IDS — Information Directory Service
• ACF — Advanced Communications Facility
• WBSN — Wireless Broadband-Sharing Network
• WCTB — Wireless Campus TestBed
• WIAX — WIreless Internet Access
• WTNO — Wireless Technologies and Network Overview
• TL — Telephone Lead
• WIPSC — Wireless Intelligent Personal Server Consortium
• WFOC — Wireless Full Operational Capability
• UPMT — Universal Per-application Mobility management using Tunnels
• RA — Return Alarm
• SVD — Simultaneous Voice and Data Processor
• MP — Management Processor
• PTA — Pre-Transmission Audit
• VLDS — Very Large Data Storage
• WFUP — Wireless Fair Usage Policy
• WCRM — Wireless Customer Relationship Management
• SLC — Subscriber Line Concentrator
• RCMAG — Recent Change Memory Administration Group
• ISD — Instituteuctional Systems Design
• TRD — Timed Release Disconnect
• MLS — Mobile Location Services
• RB — Randomized Block
• RAU — Residential Adaptor Unit
• STX — Start of Transmission
• CPIC — Cost Per Inbound Call
• WGEN — Wireless GENeration
• CLID — Calling Line IDentifier
• SLLR — Single Line Loud Ringer
• SCPI — Standard Commands for Programmable Instituteuments
• LR — Line Rate
• TBF — Telephone Band Filtering
• MWC — Multi-Way Calling
• MMS — Meteorological Measurement System
• TSB — Telecommunications System Bulletin
• WWRF — Wireless World Research Forum
• WBGK — Wireless BridGe Kit

• WTNPA — Wireless Telephone Number Portability Act
• SILO — Signal Intercept from Low Orbit
• WT — Wireless Telephony
• VMR — Video Mail Retrieval
• LW — Long-wavelength
• VMES — Vehicle-Mounted Earth Station
• RUIM — Removable User Identification Module
• UTI — Union Internationale des Telecommunications
• VFM — Voice/ Fax Module
• ISC — Infrastructure Service Charge
• LSI — Loop Start Interface
• CP — Customer Premises
• TBS — Telephone Billing Service
• WVAS — Wireless Value Added Services
• TCMS — Trunked Code Management System
• WLSS — WireLess Select Switch
• SIP — Service Interface Point
• PTML — Pakistan Telecommunications Mobile, LTD.
• TIP — Telecommunications Infrastructure Planning
• WWCE — World Wide Cellular Extension
• WWZA — Wireless WorkZone Alliance
• WLLD — Wireless Local Loop Delivery
• TAP — Telocator Alphanumeric Paging
• TLPU — Telecommunications Line Protector Unit
• AL — Alignment Level
• IMR — International Mobile Roaming
• TTFG — Telecommunications Technology Forecasting Group
• BP — Burst Period
• QPW — QUIKPAGER Wireless
• WTID — World TELECOM Internet Day
• TLR — Traffic Line Remover
• GRT — Georgian Railway Telecom
• VERT — Vertical (distribution frame)
• ISUP — International Standards Telecommunications Union
• WLDD — Wireless Location-Dependent Data
• BT — Best Telecommunications
• TFA — Toll Free Authorization
• FB — Framing Bit
• WFQ — Weighted Fair Queueing
• ROI — Return On Information
• C — Connection
• WWSI — Wireless Web Systems Integration
• VNTR — Variable Number Tandem Repeats
• VQI — Voice Quality Improvement
• WGX — WebPhone Gateway eXchange
• QNL — QoS Networking Laboratory, Boston University
• VMS — Virtual Machine System
• RTNZ — Rate for Transmission service for a Non-Zone load
• HN — Home Number
• RR — Receiver Ready

• WWTA — World Wireless Technologies, Asia
• FTFW — FactoryTalk For Windows
• TACS — Total Access Communications Systems
• MAPS — Maps Application Provisioning System
• RKB — Ring Knowledge Base
• RYP — Romanian Yellow Pages
• WBA — Wireless Business Application
• WLA — WireLess Access
• JLS — Just Lousy Service
• SCC — Switching Control Center
• WDSN — Wireless Distributed Sensor Networks
• UCC — Universal Connectivity Charge
• SEFL — Single-Ended Fault Locating
• SRM — Short-Range Modem
• WBBI — Wireless BroadBand Internet
• TTS — Telephone Traffic Simulator
• ITR — Intelligent Text Retrieval
• COC — Carrier of Carriers
• WRBB — Wireless Rural BroadBand
• EPPR — Empty Packet Production Rate
• QC — Quality Conversation
• WBCT — Wireless Broadband Communications Technology
• VO — Validation Office
• TMR — Trunked Mobile Radio
• ICE — Integrated Communications Environment
• OR — Office Regenerator
• CI — CHARM Interface
• BOT — Baseline of Text
• WCS — Wireless Communication Services
• SCC — Service Connection Charges
• TSI — Telecommunications Services Inc
• WLEC — WireLess Ethernet Converter
• RALB — Resource All Busy
• WIZ — Wireless Internet Zone
• RSI — Repetative Strain Injury
• VIL — Voice Interconnect Link
• TNS — Terminating Noncritical Section
• RPT — Reply Paid Telegram
• VANS — Value Added Network Services
• TTR — Touch Tone Required
• WIBR — WIreless gate BRidge
• RTS — Real-Time Simulator
• SRP — Specialized Resource Point
• ISM — Invocation State Machine
• CAS — Carrier Activity Sensor
• B — Bits
• WFZ — Wire Free Zone
• PVS — Pennisula Video Surveillance
• URQ — Unregistration Request
• WNQR — Wireless Network Quality Review

• DT — Dialup Terminal
• CP — Charging Party
• BS — Basic Service
• NM — Network Manager (GSFC)
• TTD — Temporary Transmit Delay
• CTR — Carrier Telegraph Receiver
• VZP — Virtual Zapping Phone
• F — Farenheit
• MARS — Military Affiliated Radio System
• MAP — Manufacturers Application Protocol
• CSA — Carrier Servicing Area
• TMD — Trunk Main Distributing
• RINO — Roaming International Network Operator
• TACS — Telephone Access Customer Satisfaction
• WOQS — Wireless Operator Quarterly Service
• LTA — Leased Transport Area
• WCTP — Wireless Communication Transfer Protocol
• AMS — Analog and Mixed Signal
• UMC — Ukrainian Mobile Communications
• SMC — Switch Management Center
• VA — Voice Activity
• IPM — Interpersonal Messaging System
• TIRF — Telecoms Industry Regulatory Forum
• WTSO — Washington Telecommunications Services and Operations
• DB — Dropped Burst
• ITP — Interdisciplinary Telecom Program
• SMT — Secure Mobile Transfer
• TMC — Timeslot Management Channel
• CRT — Combined Rlogin and Telnet
• TDSA — TELCO (TELephone COmpany) Distribution Support Architecture
• IAV — Images, Audio, Video
• WRB — Wireless Receiver Box
• BPS — Baud per Second
• SD — Signal distribution
• CAT — Charges, Access, and Terms
• SE — Status Enquiry
• VCC — Virtual Call Center
• WUSI — Wireless Universal Strike Interface
• AMI — Alternate Mark Indicator
• WEWI — Wireline Electronic Weight Indicator
• SLM — Signal Line Measurement
• RIM — Remote Integrated Mulitplexor
• MLE — Metropolitan Line Extension
• BM — Maximum Burst size
• UKB — Universal Keyboard
• RDN — Relative Distinguishing Name
• ISI — Institute of Scientific Information
• RC — Rudy's Cellular
• CPP — Calling Party Pay
• TWT — Time Warner Telecom

• NACSIM — National Communications Security Information Memorandum
• PSS — Phone Search Space
• PD — Power Distribution
• TTP — Third-Party Provider
• WSP — Wireless Signal Processor
• TAB — Tape Automated Bonding
• PST — Public Safety Telecommunications
• UMS — Universal Messaging System
• TPSN — Triple Play Subscriber Network
• LAW — Local Area Wireless
• FP — Full Period of service
• LTS — Laboratory for Telecommunication Sciences
• CTM — Cellular Textphone Modem
• O — Other
• TVM — T1 Voice Module
• ULLS — Unconditioned Local Loop Service
• WNQ — Wireless Network Quality
• DM — Distributed Management
• ITR — International Telecommunication Regulations
• MB — Medium Band
• UA — Universal Access
• VQE — Voice-Quality Enhancements
• TTE — Tallahassee Telephone Exchange
• WPCS — Wireless Personal Communications Services
• UNLD — UNlimited Long Distance
• TMO — Telecommunications Management Officer
• SNAP — Subnetwork Access Point
• GC — Global Communications
• TOS — Terms Of Service
• QOB — Quality Of Burst
• TAC — Terminal Access Circuit
• ETC — Eligible Telecommunications Carrier
• SAM — Sme Access For Mobile
• PSA — Protocol-Specific Annex
• SIO — Subscribers In Operation
• WTCD — World Telephone Card Databank
• SAM — System Administration Manager
• WIEA — Wireless Internet Enterprise Application
• LCWN — LiveCache Wireless Network
• FPS — Fast Packet Switching
• GTI — Graphics, Text, and Images
• WRBS — Wireless Router Base Station
• CF — Carrier Furnished
• BS — Burst Selector
• PWP — Plastic Wall Phone
• VQL — Vector Quantizing Level
• AU — Audio Units
• RTDF — Rural Telecomunication Development Fund
• TJR — Trunk and Junction Routing
• SG — Supergroup

• WCOE — Wireless Center of Excellence
• WBOX — Wireless in a Box
• WTRN — Wireless Token Ring Network
• NSC — Non-Standard Facilities Command
• SOA — Service Order Administration
• O — Oblique
• TPQ — Transmission Power Quality
• SDNB — Secondary DN Call Blocking
• WLHP — WireLess HeadPhone
• MCN — Mittweidaer CampusNet
• BTS — Best Transmission Second
• CUA — Call Unit Autodialer
• SMS — Server Malloc (Memory ALLOCation) System
• CAS — Combined Antennae Services
• WMBD — Wireless Media Broadcast Device
• TDU — T1 Distribution Unit
• SA — Service Analysis
• PC — Process Control
• PTC — Pacific Telecommunications Council
• FAST — Field Automated Subscriber Testing
• WMIP — Wireless-Mobility Integration Protocol
• IVS — Interactive Video Services
• RO — Recieve Only
• RCVS — Recharge Card Voucher System
• STR — Synchronous Transmitter/Reciever
• DTS — Data Telecom Support
• STC — Signaling Transport Converter
• RC — Rating and Certification
• WHIW — Wireless Home Installation Wizard
• AP — Applications Processor
• IAC — Install And Commission
• WWYP — Westford Web Yellow Pages
• TPS — Transmission Parameter Signalling
• TELEX — TELegraph EXchange
• SRD — Short Range Devices
• SARS — Service Assistance Referral System
• FAS — Fals ansewring supervision
• SX — Simplex (one-way)
• DS — Data Service
• FSS — Fixed Satellite Services
• WLSE — Wireless LAN (Local Area Network) Solution Engine
• SLM — Signal Leakage Meter
• FC — Fiber Channel
• S — Subscriber
• FT — Field Testing
• WLDS — Wilkes Long Distance Service
• SCC — SuperComputer Center
• SCP — Service Commitment Period
• WIXC — Wireless Internet eXpress Connection
• TIE — Telephone Interconnect Equipment

• VIEW — Virtual Interface Environment Workstation
• CT — Channel Termination
• FTW — France Telecom Wireless
• TSL — Transaction Sublayer
• SS4 — Signalling System 4 (2040/2400 Hz tones)
• IPS — Instituteuctions Per Second
• MBS — Meter Backflow Services
• WURST — Wideband, Uniform Rate, Smooth Truncation
• TS — Tip and Sleeve
• TIE — Telephone Interconnect Expansion
• LVZ — Line Variance Zero
• SAG — Subscription Assignment Group
• TSM — Telecommunications Systems Management
• CAL — Connection Access License
• TCP — Telephone Connecting Program
• WNPD — Wireless Network Persistent Data
• SPF — Summertime Phone Functionality
• LG — Line Good
• TCT — Tin Can Technology
• EOC — End Of Contents
• STS — Small Telephone System
• TOPS — Terahertz to Optical Pulse Source
• TES — Telecom Electric Supply
• ESP — Electro-Selective Pattern
• WCS — Wireless Coupon System
• VTS — Virtual Talk Session
• ASB — Application-Specific Bit
• PSP — Payphone Service Provider
• SSG — Signalling Server Global
• WRAPS — Wireless Remote Audio Perimeter Sharing
• TMS — Time-Multiplexed Switch
• SO — Serving Office
• TAP — Telecommunity Appalachian Project
• RTA — Rapid Thermal Annealing
• AN — Accessory Number
• CU — Copper Local Loop
• ALS — Accounts Ledger System
• TT — Touch Tone
• WIKS — Wireless Interactive Keypad System
• UIQ — User Interface Quartz
• MC — Make Call
• OC — Operations Channel
• RCS — Real Communication Solution
• RTB — Remote Telephone Bell
• RI — Ring Indicate
• FL — Fiber Link
• TIM — Telecom Idea Management
• TC — Terminating Channel
• WWZ — Wireless Work Zone
• HS — Heterogeneous Services

• DE — Development Estimate
• VWM — Virtual Wire Manager
• SSS — Self-Synchronous Scrambling
• RB — Reverse Billing
• TCO — Total Connection Operation
• WCZO — Wireless Communication Zoning Ordinance
• CTR — Covert Telephone Recording
• TO — Telecommunications Operator
• SIF — Signaling Information Fields
• SD — Software Distributor
• RAS — Remote Access Services
• TI — Time Independent
• WIUB — WIreless Universal Base-mounted
• VR — Variable Rate
• SB — Service Billing
• SCD — Strong Commit Dependency
• TT — Tiny Telephone
• ITA — Inferior Telecommunications Apparatus
• MCA — Missed Calls Alert
• YPBX — Ytelco Private Branch Exchange
• VIS — Vodafone International Services
• MCP — Mobile Centered Paging
• RI — Receiver Induced
• TOS — Testing Operation System
• VZBB — Verizon BroadBand
• ROS — Remote Operations Service
• TSR — Telephone Special Range
• RD — Receive Delay
• RSU — Required Service Utilization
• SI — Service Indication
• ER — EntityRelationship
• RB — Resource Bearer
• SCM — Selected Communications Mode
• RDD — Random Digit Dialing
• WLHB — WireLine HandBook
• PPC — Pay-Per-Call
• IMS — Internal Messaging System
• T — Telecom
• TPI — Tip-Party Identification
• TS — Telecom Server
• TLC — Transparent Line Control
• SU — Service Unlimited
• WOW — WithOut Wires
• SC — Supervisory Center
• TP — Typical Provider
• RT — Refuse Transmission
• SSC — Service Shortcut Changer
• SR — Subscriber Ready
• TOC — Telecommunications Outdoor Connectors

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