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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
• ETA — Estimated Time of Arrival
• YTD — Year To Date
• EBITDA — Earnings before Interest, Taxes, Depreciation and Amortization
• YMMV — Your Mileage May Vary
• ASAP — As Soon As Possible (pronounced AY-sap)
• EDD — Earliest Due Date
• OIC — Oh I See
• ANSI — American National Standards Institute, Inc.
• OEM — Original Equipment Manufacturer (usually in reference to car parts)
• XML — Extensible Markup Language
• BBS — Bulletin Board Service
• BTW — By The Way
• DND — Do Not Disturb
• GFSK — Gaussian Frequency Shift Keying
• ECG — Electrocardiogram
• FTP — File Transfer Protocol
• IT — Information Technology
• CBCU — Centralized Broadband Control Unit
• ROM — Read-Only Memory
• THX — Thanks
• APR — Annual Percentage Rate
• DCE — Data Circuit-terminating Equipment
• CSMA/CA — Carrier Sense Multiple Access/Collision Avoidance
• CPU — Central Processing Unit
• PPM — parts per million
• ARP — Address Resolution Protocol (ATM)
• EPA — Environmental Protection Agency (US)
• LASER — Light Amplification By Stimulated Emission Of Radiation (cf. Maser)
• IP — Internet Protocol
• NMSE — Normalized Mean Square Error
• COB — close of business (End of duty day)
• UK — United Kingdom of Great Britain and Northern Ireland
• AC — Alternating Current
• CU — See You
• IRC — Internet Relay Chat
• POC — Point Of Contact
• FIFO — First In, First Out
• YGWYPF — You Get What You Pay For
• C4I — Command, Control, Communications, Computers, & Intelligence
• PDF — Portable Document Format (created by Adobe Acrobat)
• 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.
• ATM — Automatic Teller Machine
• CRT — Cathode Ray Tube (type of TV)
• FAQ — Frequently Asked Questions (sometimes Pronounced Fak)
• CSR — Customer Service Representative

• C3I — Command, Control, Communications & Intelligence
• R&D — Research & Development
• QC — Quality Control
• DWDM — Dense Wavelength Division Multiplexing
• IQ — Intelligence Quotient
• CCTV — Closed-circuit television
• MTBF — Mean Time Before Failure
• MOU — Memorandum of Understanding (an MOU between Food & Drug Administratin and a regulatory agency in another country allows mutual recognition of inspections)
• GUI — Graphical User Interface (goo-ey)
• API — Application Programming Interface
• LRU — Line Replaceable Unit
• ASCII — American National Standard Code for Information Interchange
• BRDF — Bidirectional Reflectance Distribution Function
• TQM — Total Quality Management
• ISO — International Organization for Standardization
• CR — Carriage Return
• RF — Radio Frequency
• ISO — In Search Of
• MAN — Metropolitan Area Network
• RFP — Request For Proposal
• BPM — Beats Per Minute
• ISP — Internet Service Provider
• EDI — Electronic Data Interchange
• BTU — British Thermal Unit
• CT — Computed Tomography
• MRI — Magnetic Resonance Imaging
• LCD — Liquid Crystal Display
• AFAIK — As Far As I Know
• CY — Calendar Year
• FEMA — Federal Emergency Management Agency
• CSMA/CD — Carrier Sense Multiple Access with Collision Detection
• RQMT — Requirement
• EU — European Union (1994; formerly referred to as the EEC or EC)
• TBD — To Be Determined
• LED — Light-Emitting Diode
• P&L — Profit and Loss statement
• LLC — Limited Liability Company
• BRB — Be right back
• NPV — Net Present Value {economics}
• ATM — Asynchronous Transfer Mode
• SYN — Synchronous
• GIS — Geographic Information System
• X-BAR — Crossbar telephone exchange
• DOE — Distributed Object Environment
• CEO — Chief Executive Officer
• VPN — Virtual Private Network (ATM)
• RPM — Revolutions Per Minute, (Rotations Per Minute)
• PDT — Pacific Daylight Time
• SME — Subject Matter Expert
• F2F — Face To Face (also Meeting In Person)

• GPS — Global Positioning System (ex-NAVSTAR)
• EAP — Employee Assistance Program
• IAMAI — Internet and Mobile Association of India
• ACK — Acknowledge (telecommunications; Cf. NAK)
• O&M — Operation and Maintenance
• WTG — Way To Go
• ASTM — American Society for Testing and Materials (Philadelphia, Pennsylvania)
• GSM — Global System for Mobile Communications
• DOA — dead on arrival
• QA — Center for Quality Assurance in International Education
• WWW — World Wide Web
• RDF — Resource Description Framework
• ASME — American Society of Mechanical Engineers
• JIT — Just in time
• ISAR — Inverse Synthetic-Aperture Radar
• DOD — United States Department of Defense
• SD — Standard Deviation
• AMD — Advanced Micro Devices, Inc. (producer of computer chips)
• PO — Purchase Order
• HTTP — Hypertext Transfer Protocol
• WB — Welcome Back
• ABC — activity based costing
• AM — Amplitude Modulation
• WBS — Work Breakdown Structure
• FET — Field Effect Transistor
• RTN — Regional Telecommunication Network
• SMTP — Simple Mail Transfer Protocol
• CCB — Change Control Board
• CDR — Critical Design Review
• OCR — Optical Character Recognition
• UR — Your
• S X S — Step-by-Step
• CAD — Computer Aided Designer
• WACN ID — Wide Area Communications Network IDentifier
• ATTN — Attention
• EST — Eastern Standard Time
• IPO — Initial Public Offering
• MIS — Management Information System (OSHA)
• IRR — Internal Rate of Return
• PDR — Preliminary Design Review
• VIP — Very Important Person
• ARPA — Advanced Research Projects Agency (made early internet)
• PDA — Personal Digital Assistant
• SOW — Statement Of Work
• PGP — Pretty Good Privacy (encryption)
• XA-FR — Exchange Access Frame Relay
• CD — Compact Disc
• WAN — Wide Area Network
• TEMIP — Telecommunications Management Information Platform
• ADSL — Asymmetric Digital Subscriber Line

• AUP — Acceptable Use Policy
• RAEX — Roaming Agreement EXchange
• DARPA — Defense Advanced Research Projects Agency (US)
• CPE — Customer Premises Equipment
• RAM — random-access memory
• FDIC — Federal Deposit Insurance Corporation
• CRM — Customer Relationship Management
• IRL — In Real Life
• VAT — Value Added Tax
• SLA — Service Level Agreement
• X-OFF — Transmitter Off
• DRAM — Dynamic Random Access Memory (dee-ram) (computing)
• CV — Curriculum Vitae
• OC-256 — Optical Carrier Signal, Level 256
• SRAM — Static Random Access Memory (ess-ram)
• S-BCCH — Short Message Service Broadcast Control Channel
• E-LEAD — Ear Lead
• ACH — Automated Clearing House
• AGC — Automatic Gain Control
• ESA — European Space Agency
• X-ON — Transmitter On
• B-ICI — Broadband Inter-Carrier Interface
• PC — Personal computer (host)
• 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.
• QFSK — Quadrature Frequency Shift Keying
• ACE — Access Control Entry
• A-KEY — Authentication key
• CC — Carbon Copy
• CAE — Computer-Aided Engineering
• NSF — National Sanitation Foundation
• SWAG — Scientific Wild Ass Guess
• LED — law enforcement desk; light emitting diode
• PVT — Private
• C-NBAP — Common Node B Application Part
• ZDBOP — Ziff-Davis Benchmark Operation
• UAX 14 — Unit Automatic eXchange type 14
• ISDN — Integrated Services Digital Network
• TTYL — Talk To You Later (Internet Slang)
• DSS — Decision Support System
• MDF — Main Distribution Frame
• RFI — Request For Information. Sales department shorthand. Special priority when use in conjunction with RFN (see below).
• ICT — Information and Communication Technology
• PCB — printed circuit board
• EOM — End Of Message
• 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
• AM — Ante Meridian
• RFQ — Request For Quotation
• BBS — Bulletin Board System
• FFT — Fast Fourier Transform
• COO — Chief Operation Officer

• CIO — Chief Information Officer
• DHCP — Dynamic Host Configuration Protocol
• TNX — Thanks
• SQL — Structured Query Language
• DOS — Disk Operating System
• ATA — Area Transportation Authority
• DES — Data Encryption Standard
• ASA — American Standards Association
• KISS — Keep It Simple Stupid
• RFC — Request For Comment
• CBT — Computer Based Training
• HZ — cycles per second (hertz)
• MLS — Microwave Landing System
• OC-18 — Optical Carrier Signal, Level 18
• DAHDI — Digium/Asterisk Hardware Device Interface
• IETF — Internet Engineering Task Force
• ATC — Air traffic control
• BCC — Blind Carbon Copy
• CDT — Central Daylight Time
• FIPS — Federal Information Processing Standard
• I.LINK — IEEE 1394, High Performance Serial Bus, implementation
• WYSIWYG — What You See Is What You Get (pronounced Wizzy-wig. See Entry For Derived Acronyms)
• ABI — Application Binary Interface
• ASP — Application Service Provider
• VHF — Very High Frequency
• QOS — Quality of Service
• ITU — International Telecommunication Union
• MOB — Mobile
• POP — Point Of Presence (Internet)
• D-NBAP — Dedicated Node B Application Part
• M-CSI — Mobility management CAMEL (Customized Applications for Mobile network Enhanced Logic) Subscription Information
• NFS — Network File System
• JV — Joint Venture
• ATOM — Any Transport over MPLS (Multi-Protocol Label Switching)
• CST — Central Standard Time (UTC-6 Hours)
• CMS — Content Management System
• SSL — Secure Socket Layer
• IVR — Interactive Voice Response (telephone technology)
• GATT — General Agreement on Tariffs and Trade (government)
• H323 — ANSI standard for format over IP
• NIST — National Institute of Standards and Technology
• ROI — Return on Investment
• HVAC — Heating, Ventilation, and Air Conditioning
• T-CARRIER — Trunk Carrier
• CPM — Critical Path Method
• SABGW — System Architecture Evolution Gateway
• C³CM — Command, Control and Communications Countermeasures
• PNG — Portable Network Graphics (graphic file standard/extension)
• ACM — Association for Computing Machinery
• EIS — Executive Information System

• T-IC — T-interConnect
• DCOM — Distributed Component Object Model
• CFO — Communication Filing Officer
• IRS — U.S. Internal Revenue Service
• CGI — Common Gateway Interface
• RPI — Retail Price Index
• MTTR — Mean Time To Repair
• RDBMS — Relational Database Management System
• FAA — Federal Aviation Administration
• OC-9 — Optical Carrier Signal, Level 9
• DNS — Domain Name System
• CIS — Commonwealth of Independent States
• WML — Wireless Markup Language
• ECU — Electronic Control Unit
• DLL — Dynamic Link Library (computer file)
• CSMA/CD — Carrier sense multiple access / collision detection
• SLIP — Serial Line Interface Protocol
• SAR — Search And Rescue
• SDD — Software Design Document
• SAN — Storage Area Network
• 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
• KBYTE — Kilobyte (103)
• CSA — Canadian Space Agency
• VC-ATOD — Virtual Clearinghouse on Alcohol, Tobacco and Other Drugs
• AES — Advanced Encryption Standard
• NMR — Nuclear Magnetic Resonance
• DNS — Domain Name Service
• FSAI — Fiber Serving Area Interface
• PRI — Primary Rate Interface (ISDN)
• NATO — North Atlantic Treaty Organisation
• NYSE — New York Stock Exchange
• EOT — End Of Transmission
• EEG — Electro-EncephaloGram
• CIR — Committed Information Rate (Frame Relay)
• RQMTS — Requirements
• BPS — bits per second
• SDR — Special Drawing Rights
• UHF — Ultra High Frequency (300-3000 MHz; 1m-10cm)
• BSOD — Blue Screen Of Death
• IP — Intellectual Property
• RFO — Reason For Outage
• PM — Preventive Maintenance
• EFT — Electronic Funds Transfer
• NA — Not Applicable
• EC — European Commission
• DOJ — Department of Justice (US)
• ROFL — Rolling on the floor laughing
• VAZO — Violating All-Zero Octet
• DSL — Digital Subscriber Line
• EDS — Electronic Data Systems Corporation

• EEC — European Economic Community (predecessor of the European Union|EU)
• UDP — User Datagram Protocol (FDDI related)
• DC — Direct Current
• UI — User Interface
• ADD — Addendum
• MIPS — Millions of Instructions Per Second
• CAM — computer aided manufacturing
• CLI — Command line Interface (Cabletron)
• MB — Megabyte
• DBMS — Database Management System
• DB — Decibel
• CONG — Congestion message
• USGS — United States Geological Survey (DOI)
• UTC — Coordinated Universal Time
• QMS — Quality Management System
• ECO — Engineering Change Order
• VM — Voice Mail
• CUG — Closed User Group
• SQA — Software Quality Assurance
• CUL — See You Later
• CRC — Contrôle de Redondance Cyclique (French: Cyclic Redundancy Check)
• CSMA — Carrier Sense Multiple Access
• I/O — Input/Output
• SAS — Statistical Analysis System
• ACL — Access Control List
• CDMA — Code Division Multiple Access (voice/data transmission)
• FCC — Federal Communications Commission (US)
• DSC — Differential Scanning Calorimetry
• PDH — Plesiochronous Digital Hierarchy
• PST — Pacific Standard Time (UTC-8 Hours)
• AIR — Account Information and Refill
• SIC — Standard Industrial Classification (Code)
• GSA — U.S. General Services Administration
• AAAS — American Association for the Advancement of Science
• NOAA — National Oceanic and Atmospheric Administration (US)
• UAV — Unmanned Aerial Vehicle
• ADR — Address
• DAC — Discretionary Access Control
• NTIS — National Technical Information Service Technology Administration
• UN — United Narions
• GPRS — General Packet Radio Service
• RDY — Ready
• AGP — Accelerated Graphics Port
• DBORS — Data Base of Records
• AT&T — American Telephone and Telegraph (U.S. company, also known as "Ma Bell")
• SCM — Supply Chain Management
• LF — Low Frequency
• B2B — Business to Businesse
• FX — Foreign Exchange
• ADPE — Automatic Data Processing Equipment

• PSTN — Public Switched Telephone Network
• OS — Operating System
• PUHU — Pick Up Hang Up
• PVC — Permanent Virtual Circuit (ATM)
• MHS — Message Handling System (electronic)
• ACE — Advanced Computing Environment
• ADM — Add-Drop Multiplexer
• AE — Account Executive
• SCSI — Small Computer System Interface
• DDE — Dynamic Data Exchange (in software parlance)
• BVR — Beyond Visual Range
• TCP — Transmission Control Protocol
• BPR — Business Process Re-engineering
• EBCDIC — Extended Binary Coded Decimal Interchange Code (pronounced Eb-see-dik) (cf. BCD)
• FDDI — Fiber Distributed Data Interface
• NIH — Not Invented Here
• M — Meter
• COR — Carrier Operated Relay
• BRI — Basic Rate Interface
• BER — Bit-Error Rate
• ATCRBS — Air Traffic Control Radar Beacon System
• CS — Computer Science
• AOL — America on line
• SOHO — Small Office Home Office
• DTE — Data Terminal Equipment
• WWW3 — World Wide Web Consortium
• W3C — World Wide Web Consortium
• PERT — Program Evaluation and Review Technique
• ACK — ACKnowledgment
• NEMA — National Electric Manufacturer's Association
• PM — Project Manager
• CMM — Capability Maturity Model
• Q&A — Question & Answer
• NEC — National Electrical Code
• BSD — Berkeley Software Distribution
• OSHA — Occupational Safety and Health Act (1970)
• APT — Automatic Picture Transmission
• IANA — Internet Assigned Numbers Authority
• KHZ — kilohertz (1000 cycles per second)
• ABET — Accreditation Board for Engineering and Technology, Inc.
• STP — standard temperature and pressure (0° and 1 atm)
• EVP — Executive Vice President
• OFC — Office
• OMG — Object Management Group
• NOS — Network Operating System
• CIA — Central Intelligence Agency
• CM — Configuration Management
• DAM — Diagnostic Acceptability Measure
• CAA — Civil Aviation Authority
• ABR — Available Bit Rate

• GB — Gigabyte
• MST — Mountain Standard Time
• AOA — Angle Of Arrival
• SNMP — Simple Network Management Protocol (ATM)
• BR — Branch
• WWW — World Weather Watch
• TCO — Total Cost of Ownership
• MAC — Media Access Control
• AQL — Acceptable Quality Level
• LMS — Learning management system
• AT&T — American Telephone & Telegraph
• DMA — direct memory access (computer term)
• DSA — Digital Signature Algorithm
• NPI — New Product Introduction
• CPT — Carriage Paid To
• PPP — Point-to-Point Protocol
• WMO — World Meteorological Organization (ICSU)
• EDT — Eastern Daylight Time
• FM — frequency modulation
• MBR — Master Boot Record
• MLS — Multiple Listing Service
• AAC — Advanced Audio Coding
• BST — British Summer Time
• JPEG — Joint Photographic Experts Group (24-bit image storage format)
• PBX — Private Branch eXchange (company phone system)
• SAIC — Science Applications International Corporation
• AF — Audio Frequency
• VVX — Voice and Video eXchange
• DDL — Data Definition Language
• RAID — Redundant Array of Inexpensive Disks
• ERP — Enterprise Resource Planning
• TV — Television
• EMC — Electromagnetic Compatibility
• CW — Continuous Wave
• ELF — Extremely Low Frequency
• SCC — Standards Council of Canada
• SAE — Society of Automotive Engineers
• AFC — Automatic Frequency Control
• AWG — American Wire Gauge
• RFI — Radio Frequency Interference
• NRC — National Research Council (Canada)
• T&C — Terms & Conditions
• DSP — Digital Signal Processor
• AIS — Automated Information System
• ROS — Return on Sales
• EMG — Electromyogram
• RFD — Request For Discussion
• BT — British Telecommunications
• KM — Knowledge Management
• BIOS — Basic Input Output System

• ZIP — Zone Improvement Plan
• EAI — Enterprise Application Integration
• DDD — Direct Distance Dial
• LD — Long Distance
• ACC — Adaptive Cruise Control
• ADN — Advanced Digital Network
• HTML — Hyper Text Markup Language
• TC — Telephone Call
• RSN — Real Soon Now [which may be a long time coming]
• PMA — Physical Medium Attachment
• IM — Instant Message
• OM — Old Man
• CAD — Computer-Aided Design
• AADC — Automated Area Distribution Center
• CORBA — Common Object Request Broker Architecture
• 9 — Nine
• ROTFL — Roll On The Floor Laughing
• LEO — Low Earth Orbit (satellite communications)
• DMSP — Defense Meteorological Satellite Program (U.S.)
• AYT — Are You There
• RWR — Radar Warning Receiver
• UPS — Ultraviolet Photoelectron Spectroscopy
• RMS — root mean square (preferred over "RMS")
• ICANN — Internet Corporation for Assigned Names and Numbers
• EDVAC — Electronic Discrete Variable Automatic Computer
• CG — Center of Gravity (DXS)
• USB — Universal Serial Bus
• RPC — Remote Procedure Call
• SBU — Strategic Business Units
• OSI — Open Systems Interconnection (iso Standard)
• MSN — Microsoft Network
• DME — Distance Measuring Equipment
• D-H — Diffie-Hellman
• CIS — CompuServe Information Service
• NIST — National Institute of Standards & Technology (US)
• WAP — Wireless Application Protocol
• Z — Zero
• ISBN — International Standard Book Number (ISO 2108)
• VOL — Volume
• NIMBY — Not In My Back Yard
• AE — Application Entity
• VR — Virtual Reality
• CFV — Call For Vote(s)
• Y2K — Year 2000
• EDP — Electronic Data Processing Plc (London Stock Exchange [LSE])
• TNYWR — The Number You Will Receive
• NIC — Network Interface Card
• TNSTAAFL — There's No Such Thing As A Free Lunch
• ACTV — Active
• DQPSK — Differential Quadrature Phase-Shift Keying

• WTO — World Trade Organisation
• LDAP — Lightweight Directory Access Protocol (pronounced Ell-dap)
• MMS — Multimedia Messaging Service
• WDM — Wavelength Division Multiplexing (fiber optics)
• UPS — Uninterruptible Power Supply
• MIB — Management Information Base (ATM)
• CMD — Command
• ADT — Atlantic Daylight Time (UTC-3 Hours)
• AC — Access Control
• WEP — Wired Equivalent Privacy
• NBS — National Bureau of Standards (US)
• VBR — Variable Bit Rate (ATM)
• AEC — Architecture, Engineering, Construction
• ERT — Emergency Response Team
• SHA — Secure Hash Algorithm
• BCD — Binary-Coded Decimal
• ENIAC — Electronic Numerical Integrator And Computer
• CU — Control Unit
• CB — Call Back
• RM — Regional Manager
• EW — Electronic Warfare
• DC — Disconnected
• SGML — Standard Generalized Markup Language
• EEPROM — Electrically Erasable Programmable Read-Only Memory
• MF — Medium Frequency
• VLF — Very Low Frequency
• SEI — Software Engineering Institute
• ICMP — Internet Control Message Protocol
• EOB — End Of Business
• RIP — Routing Information Protocol
• PIN — Personal Identification Number
• BGP — Border Gateway Protocol (routing protocol)
• SDMA — Space Division Multiple Access
• ISS — International Space Station
• ACD — Automatic Call Distributor
• DRM — Digital Rights Management
• AMT — Amount
• PM — post meridian
• MIME — Multipurpose Internet Mail Extension
• ECP — Engineering Change Proposals
• CES — Consumer Electronics Show
• MBPS — Megabits per second
• SMS — Short Message Service
• PPB — parts per billion (109)
• ASR — Airport Surveillance Radar
• PET — positron emission tomography
• ISSN — International Standard Serial Number (ISO 3297)
• ATS — applications technology satellite
• MGMT — Management
• OBO — Or Best Offer

• VOIP — Voice Over IP (Internet Protocol)
• EAP — Extensible Authentication Protocol
• PDU — Protocol data unit (such as segment, packet, frame, etc.)
• CRL — Certificate Revocation List
• SCADA — Supervisory Control And Data Aquisition
• PCM — Pulse-Code Modulation
• JAXA — Japan Aerospace Exploration Agency
• BYOD — Bring Your Own Device
• PDN — Public Data Network
• OLE — Object Linking and Embedding (Microsoft communication protocol)
• NSA — National Security Agency
• PD — Public Domain
• DTI — Department of Trade and Industry (UK)
• PECVD — Plasma-Enhanced Chemical Vapor Deposition
• DWDM — Dense Wavelength-Division Multiplexing
• AATSR — Advanced Along-Track Scanning Radiometer
• STS — Space Transportation System
• OSS — Operational Support System
• ELINT — Electronic Intelligence Satellite
• NAFTA — North American Free Trade Agreement
• CCD — Charge Coupled Device - a device for the movement of electrical charge.
• AVHRR — Advanced Very High Resolution Radiometer  
• TEL — Telephone
• PCMCIA — Personal Computer Memory Card International Association
• RM — Resource Management
• SNR — Signal-to-Noise Ratio
• BNSC — British National Space Centre
• ALC — Automatic Level Control
• EPR — Ethylene-Propylene Rubber
• AMI — Advanced Metering Infrastructure
• LEC — Local Exchange Carrier
• AES — Auger Electron Spectroscopy
• CFD — Call For Discussion
• YL — Young Lady
• SOAP — Simple Object Access Protocol
• HF — High Frequency
• MMU — Memory Management Unit
• EISA — Extended Industry Standard Architecture
• OSPF — Open Shortest Path First (ATM)
• IEC — International Electrotechnical Commission
• CCNA — Cisco Certified Network Associated
• TCP/IP — transmission control protocol/internet protocol
• ASEAN — Association of South East Asian Nations
• JVM — Java Virtual Machine
• ADC — Analog-Digital Converter
• AAAI — American Association for Artificial Intelligence's
• CHAP — Challenge Handshake Authentication Protocol (ATM)
• HDML — Handheld Device Markup Language
• AD — Active Directory
• SVP — Senior Vice President

• RACF — Resource Access Control Facility
• EGA — Enhanced Graphics Adapter
• CCM — counter-countermeasure
• SDH — Synchronous Digital Hierarchy (ATM)
• APPL — Application
• DOM — Document Object Model
• SIG — Special Interest Group
• ECE — Economische Commissie voor Europa (United Nations) (Dutch: Economic Commission for Europe)
• FCS — Frame check sequence (Ethernet)
• CHF — Swiss Franc
• 100BASE-T2 — 100 Megabits per Second, Baseband, Two-pair Category 3 UTP cables
• USD — United States Dollar
• CIM — Common Information Model
• AVL — Available
• NCSA — National Center for Supercomputing Applications
• COQ — Cost Of Quality
• LF — Line Feed
• CTD — Cumulative Trauma Disorder
• CG — Coast Guard
• RTU — Remote Terminal Unit
• BSA — Business Software Alliance
• WORM — Write-Once, Read-Many
• SDK — Software Development Kit (Microsoft)
• MAC — Message Authentication Code
• DLR — Design Layout Record
• JPL — Jet Propulsion Laboratory (California Institute of Technology) (NASA)
• HW — Hardware
• CCSDS — Consultative/Consultative Committee for Space Data Systems
• PSK — phase-shift keying
• WB — Write Back
• BIP — Bit-Interleaved Parity
• 911 — Emergency Services Phone Number
• AME — Amplitude Modulation Equivalent
• ISAS — Institute of Space and Astronautical Sciences (Japan)
• FASB — Financial Accounting Standards Board
• AIS — Alarm Indication Signal
• WIPO — World Intellectual Property Organization
• HTTPS — HyperText Transfer Protocol Secure
• SBC — Southwestern Bell Corporation
• BUS — Business
• ECMA — European Computer Manufacturer's Association
• 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)
• LP — Low Pressure
• RAD — Rapid Application Development
• SOGA — Share of Gross Adds
• RU — Are You?
• MIT — Massachusetts Institute of Technology (U.S.)
• KB — Kilobyte: One thousand and twenty-four bytes kbps kilo bit per second
• NTIA — National Telecommunications and Information Administration
• ARA — Apple Remote Access

• SPC — Statistical Process Control. Forerunning quality theory from the 1960s to TQC and TQM.
• DFD — Displaced Frame Difference
• ACPI — Advanced Configuration and Power Interface
• EFF — Electronic Frontier Foundation
• MS — Millisecond
• DCE — Distributed Computing Environment
• IRS — Interface Requirements Specification
• GHZ — Gigahertz
• EC — European Community
• LCP — Link Control Protocol
• RNC — Radio Network Controller
• WG — Working Group
• NNTP — Network News Transfer Protocol
• DSSS — Direct Sequence Spread Spectrum
• TLS — Transport Layer Security
• NESDIS — National Environmental Satellite, Data, and Information Service
• PLD — Programmable Logic Device
• BOFH — Bastard Operator From Hell
• VOC — Volatile Organic Compounds (air pollution)
• DQE — Detective Quantum Efficiency
• ADT — Abstract Data Type
• ATN — Aeronautical Telecommunication Network
• ISAKMP — Internet Security Association and Key Management Protocol
• DCN — Design Change Notification
• CMI — Computer Managed Instruction
• DSTE — Digital Subscriber Terminal Equipment
• EEHO — Either End Hop Off
• POTS — Plain Old Telephone Service (FCW)
• TCB — Trusted Computing Base
• RACON — Radar Beacon
• VAC — Vacant
• CCSD — command communications service designator; control communications service designator
• ACT — ACTIVITY, ACTIVITIES
• PKI — Public Key Infrastructure (cryptography)
• TB — Terabyte
• DASD — Direct Access Storage Device
• ASQC — American Society for Quality Control's
• TAG — Technical Advisory Group for Biological Control Agents of Weeds
• HSDPA — High-Speed Downlink Packet Access
• ADCCP — Advanced Data Communications Control Procedures
• CRIS — Carrier Route Information System
• AT — Advanced Technology
• FCA — Free Carrier
• NIC — Network Information Center
• NOC — Network Operations Center
• APIC — Advanced Programmable Interrupt Controller
• CFD — computational fluid dynamics
• DFS — Distributed File System
• HDLC — High-Level Data Link Control
• C4 — Command, Control, Communications, and Computers

• LRJ — Location Reject
• FAR — Federal Aviation Regulation
• JSC — Johnson Space Center (Houston, TX)
• WLAN — Wireless Local Area Network
• CSO — Customer Service Operations
• PRF — Pulse Repetition Frequency
• BG — Background
• DSN — Deep Space Network - network of large antennas and communication facilities.
• VB — Visual Basic
• PT — Project Team
• ASQ — Alpha System Qualification
• D-RAM — Dynamic Random Access Memory
• IRDA — Infrared Data Association
• JST — Japan Standard Time
• B2C — Business-to-Consumer
• PE — Polyethylene
• QAM — quadrature amplitude modulation
• MDA — Model Driven Architecture
• ASK — amplitude shift keying
• IPVX — Internet Protocol version X
• URI — Uniform Resource Identifier
• AU — Audio Unit
• EDD — Envelope Delay Distortion
• OCC — Occupancy
• EHF — Extremely High Frequency
• MRC — Monthly Recurring Charge
• TTY — Teletype Telex Machine
• QI — Quality Improvement
• ODBC — Open Database Connectivity
• PABX — private automatic branch exchange (telephone)
• OD — Outside Diameter
• AP — Application Protocol
• ITSEC — Information Technology Security Evaluation Criteria
• AMHS — Automated Message Handling System
• RFS — Request For Service
• CBC — cipher block chaining
• NMS — Network Management System
• BIS — Bureau of Indian Standards
• CERT — Computer Emergency Response Team
• AS — Autonomous System
• CMP — Connection Management Protocol
• RCU — Remote Control Unit
• ADP — Automatic Data Processor
• RDP — Radar Data Processing
• PAR — Precision Approach Radar
• DTX — Discontinuous Transmission
• BJT — Bipolar Junction Transistor
• DSA — Directory System Agent
• SPC — Stored Program Control
• 100BASE-T — 100 Megabits per second, Baseband, Twisted pair

• MCD — Magnetic Circular Dichroism
• ANI — Automatic Number Identification (Caller ID)
• MDA — Monochrome Display Adapter
• ISMI — International mobile subscriber identity
• ECR — Electronic Cash Register
• TDMA — Time Division Multiple Access
• ADF — Automatic Direction Finder
• STM — Short Term Memory
• AEW — Airborne Early Warning
• EMS — Express Mail Service
• 3G — Third Generation mobile phone network
• UML — Unified Modeling Language (Object Management Group, OMG)
• FEC — Forward Error Correction
• GRE — Generic Routing Encapsulation
• VTC — Video Teleconference
• STA — State
• NIS — Network Information Service
• RH — Relative Humidity
• SMI — Structure of Management Information
• ECN — Explicit Congestion Notification
• MPEG — Motion Picture Experts Group
• BAN — Base Area Network
• MTU — Maximum Transmission Unit
• IPX — Internetwork Packet Exchange
• ESF — Extended Super Frame (ATM)
• ATF — Advanced Tactical Fighter
• RDF — Radio Direction Finder
• FAX — Facsimile
• BPRZ — Bipolar Return-to-Zero
• CPS — characters per second
• CDR — Call-Detail Record
• NCS — National Communications System
• NFPA — National Fire Protection Association
• CGM — Computer Graphics Metafile
• APC — American Power Conversion
• YABA — Yet Another Bloody Acronym
• TRLR — Trailer
• IMSI — International Mobile Subscriber Identity
• FTTB — Fiber To The Building
• IMEI — International Mobile Equipment Identity
• SP — Service Provider
• MVS — Multiple Virtual Storage
• FEP — Front End Processor
• ELT — Emergency Locator Transmitter
• RSVP — Resource Reservation Protocol (Internet)
• CFE — Contractor-Furnished Equipment
• VIRUS — Vital Information Resources Under Siege
• BOC — Bell Operating Company
• APS — Automatic Protection Switching (SONET/SDH)
• CMC — Career Management Center

• SAR — synthetic aperture radar (satellite)
• HSD — High Speed Data
• LPE — Liquid Phase Epitaxy
• ASIC — application-specific integration circuit
• RARP — Reverse Address Resolution Protocol
• WK — Week
• ADB — Apple Desktop Bus
• BUR — Bandwidth Usage Redundancy
• EGP — Exterior Gateway Protocol
• MCC — Mission Control Center (JSC)
• DSCP — Differentiated Services Control Point
• VMS — Virtual Memory System
• LZ — Landing Zone
• ISRO — Indian Space Research Organisation
• DCMI — Dublin Core Metadata Initiative (Online Computer Library Center)
• CDE — Common Desktop Environment
• IS — International Standard
• ADM — Add/Drop Multiplexer
• WPM — speech--words per minute
• NSAI — National Standards Authority of Ireland
• RAN — Radio Access Network
• CIC — Circuit Identification Code
• SHF — Super High Frequency
• SRS — Software Requirements Specifications
• NTP — Network Time Protocol
• SCTP — Stream Control Transmission Protocol
• COM — Component Object Model
• DTR — Data Terminal Ready
• ARIN — American Registry for Internet Numbers
• CGI — Computer-Generated Imagery
• PDS — Protected Distribution System
• TPDU — Transport Protocol Data Unit
• UA — User Agent
• COMINT — Communications Intelligence
• SAR — Specific Absorption Rate
• YAHOO — You Are Hazy Over Oranges
• CRBT — Caller Ring Back Tone
• TOS — Type Of Service
• DOT — Department of Telecommunications (India)
• KDC — Kerberos Key Distribution Center
• NAS — Network Access Server
• BPDU — Bridge Protocol Data Unit
• CA — Certificate Authority
• ORB — Object Request Broker
• TKIP — Temporal Key Integrity Protocol
• OSTP — Office of Science and Technology Policy
• RSS — Really Simple Syndication
• ARQ — Automatic Repeat-reQuest
• CC — Country Code
• EEA — European Economic Area

• SIL — Speech Interference Level
• NLM — National Library of Medicine (National Institutes of Health)
• FR — Frame Relay
• PAN — Personal Area Network
• BS — Base Station
• TG — Task Group
• MOS — Model Output Statistics
• DID — direct inward dial
• PCI — Peripheral Component Interconnect
• RSVD — Reserved
• B-ISDN — Broadband Integrated Services Digital Network
• BECN — Backward Explicit Congestion Notification
• ATM — Adobe Type Manager
• FTTH — Fiber To The Home
• TTYL — Type To You Later
• VCC — Virtual Channel Connection (ATM)
• CPS — Cycles Per Second (now Hertz)
• APN — An Access Point Name
• EPR — Electron Paramagnetic Resonance
• ACAP — Application Configuration Access Protocol
• MS — Mobile Station
• SML/SMS — Service Management Layer/Service Management Service
• WPAN — Wireless Personal Area Network
• DDN — U.S. Defense Data Network
• 3GPP — Third Generation Partnership Project
• QPSK — aeronautical quadrature phase shift keying
• MIC — Message Integrity Check
• OTN — Optical Transport Network
• BLOS — Beyond Line-Of-Sight
• AFOSR — Air Force Office Of Scientific Research(USA)
• VXML — Voice eXtensible Markup Language
• CIFS — Common Internet File System
• ISA — Industry Standard Architecture
• SDLC — Synchronous Data Link Control
• FAT — File Allocation Table
• ARG — Argument
• VAS — Value Added Services
• AXE 10 — Series of electronic telephone exchanges from L.M. Ericsson
• DAT — Digital Audio Tape
• DIT — Directory Information Tree
• CATV — Cable Television
• SEM — Space Environment Monitor
• AWACS — Airborne Warning And Control System
• HSS — Home Subscriber Server
• SW — South West
• YP — Yellow Pages
• ASR — Automatic Speech Recognition
• PWD — Password
• OMA — Open Mobile Alliance
• ESTEC — European Space Research and Technology Centre

• MSU — Microwave Sounding Unit
• ASTD — American Society of Training and Development (Alexandria, Virginia)
• ITT — Invitation To Tender
• PDN — Packet Data Network
• ES — Errored Second
• HSCSD — High-Speed Circuit-Switched Data
• IS — Intermediate System
• VSAT — Very Small Aperture Terminal (satellite service)
• MIS — Management Information Service
• DCE — Data Communication Equipment
• FCA — Free Carrier Absorption
• MPLS — Multi Protocol Label Switching
• DDCMP — Digital Data Communications Message Protocol
• DUP — Duplicate
• VLSI — Very-Large-Scale Integration
• CAL — Calorie
• ADF — automatic document feeder
• LPC — Linear Predictive Coding
• MTSO — Mobile Telephone Switching Office
• RCC — Rescue Coordination Center
• SKU — Stockkeeping Unit
• ECM — Electronic Counter Measures
• VGA — Video Graphics Array
• PAP — Password Authentication Protocol (ATM)
• DTD — Document Type Definition (XML)
• LR-WPAN — Low-Rate Wireless Personal Area Network
• AR — Access Rate
• APM — Advanced Power Management
• TM — Technical Manual
• EULA — End User License Agreement (usually in reference to software)
• LQC — Line Quality Control
• CTS — Clear To Send
• LCN — Logical Channel Number
• NE — North-East
• OAS — Organization of American States
• GOS — Grade Of Service
• IW — Information Warfare
• UAS — Unavailable Seconds
• IV — Initialization Vector
• SONET — Synchronous Optical Network
• VOD — Video On Demand
• BIU — Bus Interface Unit
• NOTAM — Notice to Airmen
• BERT — Bit Error Rate Tester (telecommunication)
• OLAP — Online Analytical Processing
• PPARC — Particle Physics and Astronomy Research Council
• CATV — Community Antenna Television
• BER — Basic Encoding Rules (ASN.1)
• RCV — Receive
• ABBR — Abbreviation

• SDP — Session Description Protocol
• IIS — Internet Information Services
• JTF — Joint Task Force
• MS — Message Store
• MHS — Microwave Humidity Sounder
• ESS — Electronic Switching System
• DAP — Directory Access Protocol
• CBEMA — Computer & Business Equipment Manufacturers Association
• VF — Voice Frequency
• VRML — Virtual Reality Modeling Language
• AMI — Alternate Mark Inversion
• RCS — Radar Cross Section
• DDS — Digital Data Service
• ACO — Additional Call Offering
• NTFS — New Technology File System
• PROM — Programmable Read-Only Memory
• ARINC — Aeronautical Radio Incorporated
• GBPS — Gigabits per second
• BT — BlueTooth
• DLC — Digital Loop Carrier
• UL — Uplink
• SIT — Static Induction Transistor
• CBR — Constant Bit Rate
• LLC — Logical Link Control
• SMDS — Switched Multimegabit Data Service (ATM)
• MCSD — Microsoft Certified Solution Developer
• MS — Management System
• NOAO — National Optical Astronomy Observatories (Tucson, AZ)
• FCP — Fibre Channel Protocol
• IEEE-SA — Institute of Electrical and Electronics Engineers - Standards Association
• TCSEC — Trusted Computer System Evaluation Criteria
• EMR — Electromagnetic Radiation
• OTA — Office of Technology Assessment (U.S.; abolished by Congress, Fall 1995)
• PDC — Personal Digital Cellular
• CAV — Constant Angular Velocity
• BBU — Baseband Unit
• JCL — Job Control Language
• MCA — Micro Channel Architecture
• ATSR — Along-Track Scanning Radiometer
• DCS — Digital Cross-connect System
• NMT — Nordic Mobile Telephone
• PLMN — Public Land Mobile Network
• FC — Fibre Channel
• CS — Cable Select
• OSS — Operations Support System
• TO — Technical Order
• DA — Destination Address
• NREN — National Research and Education Network
• EIA — Extended Interaction Amplifier
• B3ZS — bipolar 3-zero substitution

• ME — Mobile Equipment
• TWT — Traveling Wave Tube
• IRQ — Interrupt Request
• CICS — Customer Information Control System (IBM Mainframe Software; Kicks Or C-I-C-S)
• SYM — Symmetric
• PIM — Personal Information Manager
• CAUCE — Coalition Against Unsolicited Commercial Email
• ISO — Independent System Operator (US) (see also TSO) Responsible for grid management, but does not own assets. (electricity)
• FMC — Fixed Mobile Convergence "Mobile UC or Unified Communications over Wireless"
• TDM — Time Division Multiplexer
• RADIUS — Remote Authentication Dial-In User Service
• CCTA — Central Computer and Telecommunications Agency
• TIA — Telecommunications Industry Association
• STP — Spanning Tree Protocol
• SSM — Source-Specific Multicast
• VM — Virtual Machine
• DVMRP — Distance Vector Multicast Routing Protocol
• SMB — Server Message Block
• LIU — Line Interface Unit
• ISO — Infrared Space Observatory
• SNA — System Network Architecture
• WS — Workstation
• E — Echo Time Zone
• TFTP — Trivial File Transfer Protocol (ATM)
• AFM — Atomic Force Microscopy
• DCS — Data Collection System (NOAA Polar Orbiting Satellites)
• BRA — Basic Rate Access
• 100BASE-T4 — 100 Megabits per Second, Baseband, Four-pair Category 3 UTP cables
• SVC — Switched Virtual Circuit (ATM)
• WCDMA — Wideband Code Division Multiple Access
• JIS — Japanese Industrial Standard
• DID — data item description
• HLR — Home Location Register
• NCP — Network Control Protocol
• LISP — List Processing Language
• ISOC — Internet Society
• AMR — Automated meter reading also known as Automatic Meter Reading
• EAC — Engineering Accreditation Commission
• MCU — Multipoint Control Unit
• JRE — Java Runtime Environment
• DISA — U.S. Defense Information Systems Agency
• CF — Compact Flash
• AIFF — Audio Interchange File Format
• AFS — Andrew File System
• RMI — Remote Method Invocation
• RX — Receive
• CSA — Canadian Standards Association (like UL)
• RT — Radiotelephone
• POE — power over ethernetinjector
• RTS — Request To Send

• OSF — Open Software Foundation
• IV&V — independent verification and validation
• DSLAM — Digital Subscriber Line Access Multiplexer (Module)
• TE — Traffic Engineering
• TOA — Time Of Arrival
• SLF — Super Low Frequency
• DSS — Digital Signature Standard
• CU — Channel Unit
• JDK — Java Development Kit
• OC — Optical Carrier
• MMB — Middle Mouse Button
• CFA — Carrier Facility Assignment
• EX — Exercise
• DSN — Defense Switched Network
• DPC — Destination Point Code
• EMCON — Electromagnetic Emission Control
• BS — Beam Splitter
• AP — access point
• ASI — Asynchronous Serial Interface
• DX — Duplex
• SOS — Save Our Souls (Help!)
• ACFQ — Absence Compensation Fair Queuing
• SLP — Service Location Protocol
• VLL — Virtual Leased Line
• DBS — Direct Broadcast Satellite
• PTP — Point to Point Transmission Service (electricity)
• DMS — Data Management System
• ABN — Abnormal
• MCP — Microsoft Certified Professional
• TOP — Technical Office Protocol
• ASE — Application Service Element
• SDM — Service Delivery Management
• COAX — Coaxial
• IMC — Intermediate Metal Conduit
• NE — Network Element
• AOI — Area Of Interest
• CDA — Command and Data Acquisition
• E — Energy
• TE — Terminal Equipment
• IAB — Internet Architecture Board
• SA — Scientific American
• TIFF — Tag Image File Format
• SXS — Step-By-Step
• VC — Virtual Channel
• LLU — Local Loop Unbundling
• NAT — Network Address Translation
• RPV — Remotely Piloted Vehicle
• EIGRP — Enhanced Interior Gateway Routing Protocol
• ISI — Inter-Symbol Interference
• ADL — Advanced Distributed Learning

• TEC — Total Electron Content
• DMTS — Distinguished Member Of Technical Staff
• WINS — Windows Internet Name Service
• 1000BASE-T — 1000 Megabits per Second, Baseband, Twisted Pair
• SVC — Scalable Video Coding
• DN — Distinguished Name
• ZIP — Zone Information Protocol
• ACR — Attenuation Crosstalk Ratio
• NCSC — National Computer Security Center (NSA)
• DUA — Directory User Agent
• MME — Mobility Management Entity
• WTLS — Wireless Transport Layer Security
• EPABX — Electronic Private Automatic Branch Exchange
• DNIS — Dialed Number Identification Service
• AMPS — Advanced Mobile Phone System
• CCIS — Common Channel Interoffice Signaling
• CIM — Corporate Information Management
• CAN — Campus Area Network
• CAC — Connection Admission Control (Asynchronous Transfer Mode)
• TPC — The Phone Company
• MAJ — Major
• CO — Central Office
• BACP — Bandwidth Allocation Control Protocol
• CBDS — Connectionless Broadband Data Service
• OAM&P — Operations, Administration, Maintenance & Provisioning
• TAC — Technical Assistance Center
• POP — Post Office Protocol
• FSK — Frequency-Shift Keying
• CCIR — International Radio Consultative Committee (French Acronym)
• VBA — Visual BASIC for Applications
• CAB — Conformity Assessment Body
• EMS — Element Management System (ATM)
• LT — Line Termination
• MSRN — Mobile Station Roaming Number
• DS — Digital Signal
• VPI — Virtual Path Identifier
• VHSIC — Very High-Speed Integrated Circuit
• NCAR — National Center for Atmospheric Research (US)
• CABS — Carrier Access Billing System
• SM — Senior Member
• ADEOS — ADvanced Earth Observing Satellite (Japan)
• NI — Network Interface
• NLMS — Normalized Least Mean Square
• OOP — Object-Oriented Programming
• DIS — Draft International Standard
• TDRSS — Tracking and Data Relay Satellite System
• TDOA — Time Difference Of Arrival
• FCW — Federal Computer Week
• EMS — Enhanced Messaging Service
• BNC — Bayonet Neill-Concelman

• DII — Defense Information Infrastructure
• AAS — Adaptive Antenna System
• NRPB — National Radiological Protection Board
• AT — Access Tandem
• TDD — Telecommunications Device for the Deaf
• RSRQ — Reference Signal Received Quality
• CAM — Computer-Aided Mapping
• EBCDIC — Extended Binary-Coded Decimal Interchange Code
• DIBL — Drain-induced Barrier Lowering
• FXO — Foreign Exchange Office
• ECPA — Electronic Communications Privacy Act 1986
• TDD — Time Division Duplex
• SPA — Special Prorate Agreement
• QI — Quality Indicator
• MMSI — Maritime Mobile Service Identity
• IS — Information System
• VDS — Variable Depth Sonar
• DNIC — Data Network Identification Code
• UTP — unshielded twisted pair
• DT — DWDM (Dense Wavelength Division Multiplexing) Terminal
• ATS — Automatic Transfer Switch
• BTAM — Basic Telecommunications Access Method
• FAA — Federal Aviation Agency
• WAR — Weekly Activity Report
• TOMS — Total Ozone Mapping Spectrometer (satellite Instrument)
• FITS — Flexible Image Transport System
• DIS — Distributed Interactive Simulation
• ERP — Enterprise Resource Management
• ARPU — Average Revenue Per User
• LSR — Local Service Request
• NDVI — Normalized Difference Vegetation Index
• DEMUX — Demultiplexer
• WMAN — Wireless Metropolitan Area Network
• PSN — Packet Switched Network
• F — Fellow
• E2E — End-to-End
• SBC — Session Border Controller
• EMI — Electro-Magnetic Interference
• VESA — Video Electronics Standards Association
• LEP — Large Electron Positron
• ROSAT — Roentgen Satellite
• ASN.1 — Abstract Syntax Notation One
• VLAN — Virtual Local Area Network
• BSI — British Standards Institution
• VT — Virtual Terminal
• HEX — Hexadecimal (base 16)
• 4GL — Fourth-Generation Language
• NSS — Network Switching Subsystem
• PM — Phase Modulation
• DPSK — Differential Phase Shift Keying

• SPGA — Staggered Pin Grid Array
• FH — Frequency Hopping
• CAVE — Cellular Authentication and Voice Encryption Algorithm
• FTAM — File Transfer Access and Management
• CVD — Chemical Vapor Deposition
• AF — Assured Forwarding
• AMLCD — Active Matrix Liquid Crystal Display
• IEEE-CS — Institute of Electrical and Electronics Engineers Computer Society
• ASAR — Advanced Synthetic Aperture Radar 
• 10BASE-T — 10 Megabits per second, Baseband, Twisted pair
• PEM — Privacy-Enhanced Mail
• SA — Source Address
• F — Frequency
• SAA — Systems Application Architecture
• ACF — Advanced Communications Function (IBM)
• LSF — Line Spread Function
• LRC — Learning Resource Center
• TCPA — Telephone Consumer Protection Act
• IMPACT — Integrated Manufacturing Precision Assembly Cellular Technology
• SIP — Session Initiation Protocol
• ECAC — European Civil Aviation Conference
• TOVS — TIROS Operational Vertical Sounder
• NII — National Information Infrastructure (USA)
• COO — Cost of Ownership
• ACF — Access Control Field
• COMJAM — Communications Jamming
• IRTF — Internet Research Task Force
• ESP — Encapsulating Security Payload
• AAF — Advanced Authoring Format
• CDS — Cell Directory Service
• SDP — Software Development Plan
• NW — North West
• NIU — Network Interface Unit
• COPS — Common Open Policy Service
• FE — Finite Element
• SDSL — Symmetric Digital Subscriber Line
• HDSL — High-bit-rate Digital Subscriber Line
• TTL — ToS and Time-to-Live
• QDR — Quad Data Rate
• RISC — Reduced Instruction Set Computing
• TCP/IP — Transmission Control/Internet Protocol
• ETSI — European Telecommunications Standard Institute
• CMOS — Complementary Metal Oxide Semiconductors
• AFSK — Audio Frequency Shift Keying
• MHO — My Humble Opinion
• RJ-14 — Registered Jack type 14 (2-wire connector)
• IRS — Inertial Reference System
• EST — Establish
• WWAN — wireless wide-area network
• WAIS — Wide Area Information Server

• ECP — Encryption Control Protocol
• FDD — Frequency Division Duplex
• Y — Yes
• GDS — Global Distribution System
• NSAP — Network Service Access Point
• CAC — Carrier Access Code
• DCS — Digital Cross-Connect
• OTS — Optical Transmission Section
• FEP — Front-End Processor
• PIC — Programmable Interrupt Controller
• SAN — System Area Network
• PGA — Programmable Gate Array
• LATA — Local Access and Transport Area
• CAMA — Centralized Automatic Message Accounting
• STI — Speech Transmission Index
• RDI — Remote Defect Indicator (UNI Fault Management)
• TRMM — Tropical Rainfall Measuring Mission (US-Japan)
• LSI — Large Scale Integration -> VLSI
• IN — Intelligent Network
• SMPTE — Society of Motion Picture and Television Engineers, Inc.
• NAS — Network-Attached Storage
• RACH — Random Access Channel
• IESG — Internet Engineering Steering Group
• BAOC — Barring of All Outgoing Calls supplementary service
• CEV — Controlled Environment Vault
• BDE — Borland Database Engine
• NCC — Network Control Center (GSFC)
• DUC — Digital Up-Converter
• T — Temperature
• DRFM — Digital Radio-Frequency Memory
• 2W — Two Wire
• ASA — Acoustical Society of America
• AIN — Advanced Intelligent Network
• CAM — Computer-Aided Manufacturing
• SWBD — Switchboard
• LNP — Local Number Portability
• SVD — Singular Value Decomposition
• STK — Satellite Tool Kit
• OMS — Optical Multiplex Section
• AAV — Accountholder Authentication Value
• EFS — Encrypting File System
• AUD — Audit
• BELLCORE — Bell Communications Research, Inc.
• DVB — Digital Video Broadcasting
• DTU — Data Transfer Unit
• LRC — Longitudinal Redundancy Check
• BOD — Bandwidth on Demand
• CTU — Central Terminal Unit
• TM — Thematic Mapper (Landsat)
• BMEWS — Ballistic Missile Early Warning System (bee-mews)

• SD — Software Development
• IAD — Integrated Access Device
• SITA — Société Internationale de Télécommunications Aéronautiques
• KAK — Key-Auto-Key
• BY — Busy
• IPR — Intellectual Property Right
• DSCP — Differentiated Services Code Point
• CODEC — Coder/decoder
• CO — Certificate of Origin
• ISM — Industrial, Scientific and Medical
• DW — Deep Water
• P — Predicted
• IEEE — Institute of Electrical and Electronics Engineers
• FEXT — Far-End Cross Talk
• LDP — Label Distribution Protocol
• CRO — Central Records Office
• LU — Logical Unit
• BHCA — Busy Hour Call Attempt
• DER — Distinguished Encoding Rules
• AFP — AppleTalk Filing Protocol
• AUI — Attachment Unit Interface
• WLTF — Wireless LAN (Local Area Network) Task Force
• CODASYL — COnference on DAta SYstems Languages
• LPD — Low Probability of Detection
• DAL — Dedicated Access Line
• STN — Station
• BIS — Business Information System
• FSK — Frequency Shift Keying
• BLER — Block Error Rate
• LFACS — Loop Facility Assignment and Control System
• PNP — Plug-and-Play
• RP — Reference Point
• ASARS — Advanced Synthetic Aperture Radar System
• SCPC — single channel per carrier
• RJ-25 — Registered Jack type 25 (6-wire connector)
• RDBMS — Relational Data Base Management System (Oracle)
• DL — Downlink Message
• TLC — The Learning Channel
• ETS — European Telecommunication Standard
• ECT — Explicit Call Transfer
• ASYNC — Asynchronous
• UMA — Unlicensed Mobile Access
• CRLF — Carriage-Return Line-Feed
• VTS — Vessel Traffic Service
• VCI — Virtual Channel Identifier
• DMX — De-MultipleXer
• WHT — Walsh-Hadamard Transform
• CSU — Channel Service Unit
• PUK — PIN (Personal Identification Number) Unlocking Key
• 1FB — Single line, Flat Business rate;

• SPI — Service Provider Interface
• CLDC — Connected Limited Device Configuration
• PVD — Physical Vapor Deposition
• SUS — Suspension
• MSR — Microwave Scanning Radiometer
• YA — Yet Another
• WWAN — Wireless Wide Area Network
• WARC — World Administrative Radio Conference
• FIOS — Fiber Optic Services
• RGN — Region
• WAFB — Wireless Absolute Fairness Bound
• TXM — Transmission X-ray Microscope
• RJE — Remote Job Entry
• YYP — Yahoo Yellow Pages
• WSDL — Web Services Description Language
• E&M — ear and mouth (special signaling leads)
• RSS — root-sum-square
• SATAN — Security Administrator Tool for Analyzing Networks
• FWA — Fixed Wireless Access
• LQR — Linear Quadratic Regulator
• PTA — Pakistan Telecommunication Authority
• MTA — Message Transfer Agents (Internet)
• S/N — Signal-to-Noise ratio
• IDT — Integrated Digital Terminal
• RMON — Remote Monitoring
• SPD — Serial Presence Detect
• COMDEX — Computer Dealers Exposition
• ASR — Access Service Request
• PUB — Publication (file name extension)
• 4G — Fourth Generation Wireless Systems
• MTP — Message Transfer Part
• TS — Technical Specification
• ADT — American District Telegraph Company
• B2B — Business-to-Business
• CPE — Customer Premise Equipment
• ACSE — Association Control Service Element
• AML — Amplitude Modulated Link
• ESCA — photoelectron spectroscopy for chemical analysis
• RRN — Routing Recording Number
• ODS — Operational Data Store (knowledge management)
• MX — Mixer
• CLNP — ConnectionLess-mode Network Protocol
• FECN — Forward Explicit Congestion Notification (ATM)
• CPN — Cisco Powered Network
• LIS — Lightning Imaging Sensor
• ACT — Activity
• GDM — GSM (Global System for Mobile communications) Data Module
• VQV — Voice Quality Value
• PIC — Peripheral Interface Controller
• CP — Change Proposal

• RIPE NCC — Reseaux IP Europeens Network Coordination Centre
• CMIP — Common Management Information Protocol (ATM)
• ITP — Interactive Telecommunications Program
• NLM — NetWare Loadable Module
• MMC — Microsoft Management Console (Microsoft)
• NPA — Numbering Plan Area
• DTMF — Dual-Tone MultiFrequency
• TI — Time Interval
• M — Management
• SLIP — Serial Line Internet Protocol
• DMI — Desktop Management Interface (computing)
• IPOATM — Internet Protocol over ATM
• PU — Physical Unit (IBM)
• TDR — Time-Domain Reflectometry
• MSC — Mobile Switching Center
• CBP — Coded Block Pattern
• REA — Rural Electrification Administration (US)
• PAM — Payload Assist Module
• AMSS — Automatic Message Switching System
• DIV — Divisionsion
• SPADATS — Space Detection And Tracking System
• GSM — Groupe Speciale Mobile
• PAL — Programmable Array Logic
• NAK — Negative Acknowledge
• RAU — Radio Access Unit (Army)
• DEM — Digital Elevation Model
• FR PVC — Frame Relay Permanent Virtual Connection
• TCR — Temperature Coefficient of Resistance
• DAC — Digital-To-Analog Converter
• CAPS — Call Attempts Per Second
• HW — Hardware Wars
• GMRS — General Mobile Radio Service
• MC — Message Center
• Y — Yttrium
• IPCP — Internet Protocol Control Protocol
• NT — New Technology, also Windows NT
• LAAS — Local Area Augmentation System
• MSE — Mobile Subscriber Equipment
• DLCI — data link connection identifier
• DPCM — differential pulse code modulation
• PSN — Public Switched Network
• IRLAN — Infrared LAN
• CC — Call Control
• PTT — Push to Talk Testing
• LCR — Least Cost Routing
• URN — Uniform Resource Namespace
• UAN — Universal Access Number
• ECS — Environmental Control System (Subsystem)
• SSMA — Spread-Spectrum Multiple Access
• STP — Signal Transfer Point

• 2G — Second Generation Wireless Systems
• SPA — Software Publishers Association
• STU — Secure Telephone Unit
• OBC — Onboard Computer
• NES — Network Encryption System
• STM — Scanning Tunneling Microscopy
• LEN — Line Equipment Number
• FEM — Finite Element Method
• PARC — Palo Alto Research Center
• DISN — Defense Information Systems Network
• SSAP — Source Service Access Point
• HFC — Hybrid Fiber Coaxial
• STN — Station Casinos, Inc.
• HEHO — Head End Hop Off
• CSAT — Customer Satisfaction
• PSD — Phase-Sensitive Detector
• DCN — Disconnect
• SEM — Scanning Electron Microscopes
• UART — Universal Asynchronous Receiver/Transmitter
• SZ — Seizure
• CSPDN — Circuit Switched Public Data Network
• 4 GIG — 4 Giga Intellectual Gadget
• W-CDMA — Wideband Code Division Multiple Access
• SG — Signaling Gateway (IETF)
• CFNRY — Call Forwarding on No Reply
• DCP — Design Change Package
• CES — Circuit Emulation Service
• SDHLR — Super-Distributed Home Location Register
• VTAM — Virtual Telecommunication Access Method
• LSW — Least Significant Word
• SR — Slow Release
• IPLC — International Private Leased Circuit
• KSU — Key Service Unit
• ESN — Electronic Serial Number
• MEAS — Measure
• MD — Mediation Device
• CT — Computer Telephony
• PP — Polypropylene
• FUP — Fair Use Policy
• DCS — Defense Communications System
• VLSI — Very Large-Scale Integration
• TTY — teletype terminal
• SINAD — SIgnal-to-(Noise And Distortion) ratio
• DAS — Data Acquisition System
• BUFR — Binary Universal Form for the Representation (of data)
• FLM — First Line Maintenance
• EFIS — Electronic Flight Information System
• LAG — Link Aggregation Group
• BCH — Binary Coded Hexadecimal
• MLP — Mobile Location Protocol

• RADARSAT — Radar Satellite
• CAR — committed access rate
• ERL — Echo Return Loss
• FDTD — Finite Difference Time Domain
• PHY — Physical Layer
• ACLR — Adjacent Channel Leakage Ratio
• OT — Office of Telecommunications
• BAN — Billing Account Number
• TC — Technical Committee (HL7)
• CIP — Continuous Improvement Program
• TBD — To Be Decided
• NIC — Network Interface Controller
• FRAD — Frame Relay Access Device
• XPS — X-Ray Photoelectron Spectroscopy
• CAM — Content Addressable Memory
• IPS — Instructions Per Second
• AC — Area Code
• FCA — Free Carrier Alongside
• NCP — Network Control Program
• CHTML — Compact Hypertext Markup Language
• CLEC — Competitive Local Exchange Carrier
• SML — Service Management Layer
• FEA — Finite Element Analysis
• MPI — Message Passing Interface
• AAS — advanced automation system (FAA)
• WAAS — Wide Area Augmentation System
• TOP — technical/office protocol
• 1-ESS — x-ESS series of Electronic Switching Systems
• SWAP — Shared Wireless Access Protocol
• RECON — Reconnaissance
• CDDI — Copper Distributed Data Interface
• TC — Transmission Convergence (ATM)
• RADINT — Radar Intelligence
• ESF — Edge Spread Function
• ADPCM — Adaptive Differential Pulse Code Modulation
• SLAM — Scanning Laser Acoustic Microscope
• LMDS — Local Multipoint Distribution Service
• TMSI — Temporary Mobile Subscriber Identity
• EAS — Extended Area Service
• SM OFC — Single-Mode Optical Fiber Cable
• IMAP — Internet Mail Access Protocol
• IPS — InPlane Switching
• BIP — Band Interleaved by Pixel
• PTT — Push to Talk Technology
• IEC — Interexchange Carrier
• DMARC — Demarcation point
• TACACS — Terminal Access Controller Access Control System
• SFX — Special Effects
• B6ZS — Bipolar 6 Zero Substitution
• NDIS — Network Driver Interface Specification (Microsoft Windows NT)

• TN — Telephone Number
• DLP — Data Link Processor
• CIRC — Cross-Interleaved Reed-Solomon Code
• COAM — Customer Owned And Maintained
• ACC — Area Control Center
• AFI — Authority and Format Identifier
• EIR — Excess Information Rate
• UMTS — Universal Mobile Telecommunication System
• PTT — Push to Talk Taster
• VAN — Value-Added Network
• UPT — Universal Personal Telecommunications
• ES — Emergency Service
• ATC — Advanced Technology Center
• IP — Intelligent Peripheral
• FOSE — Federal Office Systems Exposition
• CCNA — Cisco Certified Network Administrator
• TSO — Telecommunications Service Order
• MUSIC — MUltiple SIgnal Classification
• SCP — Service Control Point
• FA — Functional Area
• ARC — Army Reuse Center
• DOCSIS — Data over Cable Service Interface Specification
• JAN — Joint Army-Navy
• TOS — Temporarily Out of Service
• CAAS — Communications-as-a-Service
• MILNET — Military Network
• PCS — Personal Communications Services
• NTDS — Naval Tactical Data System
• VSAM — Virtual Storage Access Method
• RADIUS — Remote Authentication dial In User Service
• TRM — Technical Reference Model
• TSP — Telecommunications Service Priority
• SPE — Synchronous Payload Envelope
• ADN — Abbreviated Dialing Number
• ESPN — Entertainment and Sports Programming Network
• DUV — Deep Ultraviolet
• DICOM — Digital Imaging and Communications in Medicine
• LT — Less Than
• CD — Critical Dimension
• TRS — Trunked Radio Systems
• VOP — Voice Over Packet
• MBMS — Multimedia Broadcast/Multicast Service
• IWF — Interworking Function
• TE — Test Equipment
• PG — Page
• DS-0 — Digital Signal, Level 0
• AN — Access Node
• PLL — Phase Locked Loop
• MGC — Multimedia Gateway Controller
• PBT — Polybutylene Terephthalate

• EMEA — Europe, Middle East and Africa
• FAS — Frame Alignment Signal
• DID — Digital Information Display
• PTO — U.S. Patent And Trademark Office
• CSIRO — Commonwealth Scientific and Industrial Research Organization
• A — Anode
• PSK — Phase Shift Key
• RSS — Radio Service Software (Motorola)
• FTS — Federal Telecommunications System
• MTI — Moving Target Indicator
• HSPA — High Speed Packet Access
• ABM — Asynchronous Balanced Mode
• TBPS — Terabits Per Second
• AMA — automatic message accounting
• OPC — Originating Point Code
• ER — Extended Range
• ATS — Air Traffic Services
• EIP — Equipment installation procedure
• DA — deca
• RLS — Recursive Least Squares
• NMC — Network Management Center
• MP — Multilink Protocol
• TCM — Trellis-Coded Modulation
• CLETS — California Law Enforcement Telecommunication System
• ST — Such That
• SIL — Solid Immersion Lens
• SA — Selective Availability (on GPS transmissions)
• BCH — Bose-Chaudhuri-Hocquenghem Coding
• ENV — Environment
• DMT — Discrete Multi-Tone Technology
• RSN — Regional Service Network
• CI — Common Interface
• SVC — Switched Virtual Connection
• VC — Virtual Circuit (ATM)
• PDS — Planetary Data System
• MSI — Maritime Safety Information
• NTU — Network Termination Unit
• AMPS — Advanced Mobile Phone Service (cellular phone standard)
• PWM — Pulse width modulation
• BTC — Botswana Telecommunications Corporation
• BCDIC — Binary Coded Decimal Interchange Code
• SRR — Search and Rescue Region
• PUC — Public Utility Commission (electricity)
• PDT — Portable Data Terminal
• STM — Synchronous Transfer Mode
• RCC — Radio Common Carrier
• CSPRM — Common Signaling Protocols Resource Module
• 2G — Second generation cellular
• REPT — Report
• SPM — Scanning Probe Microscope

• UBR — Unspecified Bit Rate
• GTP — GPRS (General Packet Radio Service) Tunneling Protocol
• CNG — comfort noise generation
• DL — Data Link
• ROW — Rest Of World
• SIM — Subscriber Identity Module
• L2TP — Layer 2 Tunneling Protocol
• DVP — Digital Voice Privacy
• CMT — Cadmium Mercury Telluride
• RT — Remote Terminal
• FE — Far End
• SL — Single Line
• WSFL — Web Services Flow Language
• QOI — Quality of Information
• CNM — Customer Network Management
• CACM — Communications of the ACM
• 4W — Four-Wire
• NTSC — National Television Standards Committee
• MEID — Mobile Equipment Identifier
• DF — Direction Finding or Finder
• STD — Secondary Telecom District
• HTML — Hyper-Text Markup Language
• SCN — Switched Circuit Network
• TELECOMMUTE — Telecommuting
• VISSR — visible and infrared spin scan radiometer (GOES)
• TL1 — Transaction Language 1
• SIMT — Système interbancaire marocain de télécompensation
• TELNET — Telecommunications Network Protocol
• ASN.1 — Abstract Syntax Notation 1
• PRI — Priority
• CTI — Computer Telephony Integration
• EA — Extended Address Field Bit
• EBS — Electron Bombarded Silicon
• MAP — Mobile Application Part
• DL — Digital Library
• NDS — Novell Directory Services
• RLU — Remote Line Unit
• LSAP — Link Service Access Point
• RMS — Resource Management System
• L2TPV3 — Layer 2 Tunneling Protocol Version 3
• NRP — Network Resource Planning
• CPC — Calling Party Control
• CCITT — Comit? Consultatif International T?l?graphique et T?l?phonique
• SAR — Segmentation and Reassembly (ATM)
• CNG — Fax Calling Tone
• NWK — Network
• MSW — Most Significant Word
• NEMP — Nuclear Electromagnetic Pulse
• WPS — Wireless Priority Service
• MAU — Multistation Access Unit

• GI — Graded-Index
• EPP — Enhanced Parallel Port (PC)
• MOL — Manned Orbiting Laboratory
• NNM — Network Node Manager
• TCIC — Trunk Circuit Identification Code
• ANS — Advanced Network Services
• ARSR — Air Route Surveillance Radar
• SH — Shell
• RDMA — Remote Direct Memory Access
• TLK — Talk
• MSDP — Multicast Source Discovery Protocol
• IAT — Integrated Access Terminal
• CLI — Calling Line Identification
• CALEA — Communications Assistance for Law Enforcement Act
• CER — Cell Error Ratio
• RLC — Radio Link Control
• METRO — Metropolitan
• ECM — Error Correction Model
• MTD — Moving Target Detection
• E — Electra
• EV — electronvolt
• CIAC — Computer Incident Advisory Capability
• FIRST — Forum of Incident Response and Security Teams (CERT)
• TDWR — Terminal Doppler Weather Radar
• DEC — Decimal
• CDR — Clock and Data Recovery
• FTNS — Fixed Telecommunications Network Services
• CGI — Cell Global Identity
• LANE — Local Area Network Emulation
• UAT — Universal Access Transceiver
• SE — Southeast
• SM — Service Module
• MAG — Mobile Access Gateway
• ATSC — Advanced Television Systems Committee
• PTP — Point To point Protocol
• SSRC — Synchronization Source
• ARCNET — Attached Resource Computer Network
• FTTC — Fiber To The Curb光纤到路边
• JISC — Japanese Industrial Standards Committee
• TSR — Telecommunications Service Request
• DGPT — Directorate General of Posts and Telecommunications
• PIM — Protocol Independent Multicast
• MITI — Ministry of International Trade and Industry
• BT — Bluetooth Tablet
• CMRS — Commercial Mobile Radio Service
• SPX — Sequenced Packet Exchange
• A/C — Air Conditioner
• IDF — Independent Distribution Frame
• OSP — Outside Plant
• DPL — Digital Power Line

• PNP — Positive-Negative-Positive
• CDC — Connected Device Configuration
• OWS — Operator Work Station
• SDNS — Secure Data Network System
• LSI — Large-Scale Integration
• HDTV — High-Definition Television
• BBM — Blackberry Messenger
• MRT — Medical Response Team
• SCR — Sustainable Cell Rate
• B3G — Beyond Third Generation
• TOU — Time of use (rate) (electricity)
• SAI — Serving Area Interface
• DCS — Digital Cellular System
• TUR — Trunk Utilization Report
• RA — Risk Analysis
• LUNT — Line Unit Network Termination
• SMT — station management (protocol)
• OTDOA — Observed Time Difference of Arrival
• O/S — Operating System
• CSAR — Combat Search and Rescue
• DPDU — Data Protocol Data Unit
• 3-D — 3-Dimensional
• XRF — X-Ray Fluorescence
• TTY — Text Teletype
• ASDE — Airport Surface Detection Equipment
• BSS — Base Station Subsystem
• VPWS — Virtual Private Wire Service
• HFC — Hybrid Fiber/Coaxial network
• C — Cost
• USRT — Universal Synchronous Receiver/Transmitter
• MOD — Modify
• O — objective
• MBE — Molecular Beam Epitaxy
• RT — Response Time
• VPA — Valid Peripheral Address
• BUS — Broadcast and Unknown Server
• MOS — Metal Oxide Semiconductor (FET Devices)
• PE — Probable Error
• BIND — Berkeley Internet Name Domain
• OLS — Optical Line System
• PCI — Personal Computer Interface
• SEC — Software Engineering Center
• CSC — Common Signaling Channel
• UNI — User-Network Interface
• SISIR — Singapore Institute of Standards and Industrial Research
• SSM — Synchronization Status Message
• DL — Definition List
• KTS — Key Telephone System
• MBWA — Mobile Broadband Wireless Access
• FITL — Fiber-In-The-Loop

• 3G HSPA — Third-Generation High-Speed Packet Access
• DCA — Dynamic Channel Assignment
• DPL — Digital Private-Line
• NTE — Network Terminating Equipment
• IOC — Inter-Office Channel
• CASE — Computer-Aided Software Engineering
• LN — Line
• IRF — Impulse Response Function
• LBR — Low Bit Rate
• DPNSS — Digital Private Network Signaling System
• CDV — Compressed Digital Video
• SMS — System Management Server
• Q — Quadrature
• MFLOPS — Millions of Floating Point Operations per Second
• SLBM — Submarine-launched ballistic missile
• CP — Cell Phone
• DDLD — Direct Dial Long Distance
• CQA — Certified Quality Auditor
• SCH — Synchronization Channel
• FOIP — Fax Over Internet Protocol
• 2W — 2-Wire
• PMP — Project Management Professional
• EU — End User
• CGA — Color Graphics Adapter
• RM-ODP — Reference Model for Open Distributed Processing
• MIDP — Mobile Information Device Profile
• ARM — Asynchronous Response Mode
• EIR — Equipment Identity Register
• APDU — Application Protocol Data Units
• M/W — MicroWave
• DII — Dynamic Invocation Interface
• ANC — Access Network Controller
• DAC — Digital to Analog Converter-Audio
• TD-CDMA — Time Division - Code Division Multiple Access
• GSTN — General Switched Telephone Network
• OST — Office of Science and Technology
• SFN — Single Frequency Network
• TLT — Test Loop Translator
• FEBE — Far End Block Error (SONET)
• CALS — Computer Aided Acquisition and Logistic Support
• ARPANET — ARPA Network
• ATA — Analog Telephone Adapter
• FCFS — First-Come, First-Served
• RDT — Remote Digital Terminal
• FRS — Family Radio Service
• CVR — Crystal Video Receiver
• ATCA — Advanced Telecom Computing Architecture
• DFG — difference-frequency generation
• SSU — Stratospheric Sounding Unit (TOVS)
• PT — Payload Type (ATM)

• FHSS — Frequency Hopping Spread Spectrum
• DMS — Defense Messaging System
• UMTS — Universal Mobile Telecommunications Standard
• MGCP — Multimedia Gateway Control Protocol
• CB — Common Battery
• ARD — Automatic Ring Down
• SASL — Simple Authentication and Security Layer
• L2F — Layer 2 Forwarding protocol
• FRS — Frame Relay Service
• PS — Product Specification
• B8ZS — Binary Eight Zero Substitution
• VAD — Voice Activity Detection
• IPRC — Intellectual Property Rights Committee
• DQDB — Distributed Queue Dual Bus
• DSSSL — Document Style Semantics and Specification Language
• CCR — Customer Controlled Reconfiguration (Sprint)
• BSID — Base Station Identity
• WRED — Weighted Random Early Detection
• PVC — Permanent Virtual Connection
• GDK — GIMP (GNU Image Manipulation Program) Drawing Kit
• ATRAC — Adaptive Transform Acoustic Coding
• MDM — Mobile Device Management
• ETN — Electronic Tandem Network
• WSP — Wireless Session Protocol
• VOA — Voice Of America
• DUV — Data-Under-Voice
• MPI — Minimum Picture Interval
• AIF — Audio Interchange Format
• SIL — Silence
• SS7 — Signaling System 7
• FAT — Final Acceptance Testing
• TAD — Telephone Answering Device
• BSS — Basic Service Set
• DXI — Data Exchange Interface
• MO — Magneto-optic
• OS/2 — Operating System/2
• MNP — Mobile Number Portability
• BSA — Basic Service Area
• MC/MIC — Mode Common/Mode Indicate Common
• ACP — Access Control Point
• XC — Cross-Connect
• AIT — Automatic Identification Technology
• LCGN — Logical Channel Group Number
• MV — Motion Vector
• TX — Transmit
• TEI — Terminal Endpoint Identifier
• STA — Science and Technology Agency (Japan)
• GFC — Generic Flow Control (ATM)
• PLCP — Physical Layer Convergence Protocol (ATM)
• PY — person-year

• NETBIOS — Network Basic Input-Output System
• BMS — Business Management System
• Z — Zulu Time
• DUN — Dial-Up Networking
• VT — Vacuum Tube
• SMR — Specialized Mobile Radio
• SAF — System Access Fee
• FAW — Frame Alignment Word
• CDV — Cell Delay Variation(ATM)
• LD — Laser Diode
• PLCP — Physical Layer Convergence Procedure
• BABT — British Approvals Board for Telecommunications
• DOR — Detailed Outage Report
• CYTA — Cyprus Telecommunications Authority
• ECTF — Enterprise Computer Telephony Forum
• DC — Display Controller
• DNU — Do Not Use
• ALT — Accelerated Life Test
• DACS — Digital Access Cross-connect System
• C — Collector
• BONDING — Bandwidth On Demand Interoperability Group
• NIMH — Nickel-Metal Hydride
• FDL — Facility Data Link
• IT — Integration Test
• PSO — Professional Services Organization
• SCO — Synchronous Connection Oriented
• DE — Discard Eligibility (ATM)
• EST — Electroshock Therapy
• CGA — Carrier Group Alarm
• ISI — Intersymbol Interference
• IS 41 — Interim Standard 41 (Inter-Cellular Network Communication Protocol)
• DMT — Discrete Multi-tone Transmission
• FIFO — first-in, first-out
• SF — Single Frequency
• CCLC — Carrier Common Line Charge
• ALB — Analog Loopback
• DSU — Digital Service Unit
• DFE — Design For Environment
• DDL — Digital Data Link
• SRL — Singing Return Loss
• BWD — backward
• OSCAR — Orbiting Satellite Carrying Amateur Radio
• HEC — Header Error Control
• STD — Subscriber Trunk Dialing
• SRM — Scalable Reliable Multicast
• UP — User Profile
• VNL — Via Net Loss
• BSS — Base Station System
• RSL — Restricted Service License
• NHRP — Next Hop Resolution Protocol (ATM)

• AECT — Association for Educational Communications and Technology's
• GBT — Ground Based Tower
• ISG — Information Systems Group
• SMMR — Scanning Multichannel Microwave Radiometer
• IRC — International Record Carrier
• DBRNC — deciBel Relative to Noise in a Circuit
• AM — Activity Manager
• SDN — Software Defined Network
• RS-422 — Recommended Standard 422 (ANSI/EIA standard for transmitting serial data)
• SCM — Single-Carrier Modulation
• X — X Window System
• LSP — Label Switched Path
• DAS — Distributed Antenna System
• LASINT — Laser Intelligence
• BSC — Base Station Controller
• COT — Central Office Terminal
• BHCA — Busy Hour Call Attempts
• LCAS — Link Capacity Adjustment Scheme
• CS — Convergence Sublayer (ATM)
• OSA — Open System Architecture
• EFCI — Explicit Forward Congestion Indication (ATM)
• PSNEXT — Power Sum Near End Cross Talk
• ADC — Administration Center
• CAP — Capability
• 3GSM — Third-generation Global System for Mobile (communications)
• CERN — Conseil Europeen Pour La Recherche Nucleaire
• ACU — Automatic Calling Unit
• CBQ — Class-Based Queuing
• SS1 — Signalling System 1 (500/20 Hz tones)
• NAM — Number Assignment Module
• S/D — Source/Drain
• CCSA — Common Control Switching Arrangement
• IPM — Inches Per Minute
• FMS — Fraud Management System
• EVA — Electronic Video Agent
• ZD — Zero Defects
• SDU — Signal Distribution Unit
• NAU — Network Addressable Unit
• 3G — 3rd Generation Wireless Format
• TACSAT — Tactical Satellite
• RNR — Receive Not Ready
• BAN — Building Area Network
• WTP — Wireless Transaction Protocol
• BS — Broadcast Satellite
• MR — Mobile Router
• JSC — Joint Scientific Committee (ICSU, WCRP, and WMO)
• FEAT — Feature
• BCS — British Computer Society
• CIS — Computer and Information Science
• FOC — Fiber-Optic Cable

• CRB — Cramer-Rao Bound
• VCT — Variable Cam Timing
• CONUS — Contiguous United States
• OXCO — Oven-Controlled Crystal Oscillator
• TEL & TEL — TELephone and TELegraph
• BAP — Bandwidth Allocation Protocol
• AWS — Advanced Wireless Services
• SYNC — Synchronization
• LOO — Likelihood of Occurrence
• ATD — Advanced Technology Demonstration
• VLR — Visitor Location Register
• CCR — Current Cell Rate (ATMF)
• NAP — Network Access Point
• NC — Network Computer (PC Internet)
• CLK — Clock
• USF — Universal Service Fund
• SSM — Spread Spectrum Modulation
• ANSI-41 — ANSI standard for mobile management
• CAS — Column Address Strobe
• IXC — interexchange carrier
• GRX — GPRS Roaming Exchange
• PMT — Photo Multiplier Tube
• DHD — Dial Home Device
• NRZ — Nonreturn To Zero
• DXF — Data Exchange Format
• MTS — Message Transfer System
• COO — Cell of Origin
• DMT — Discrete Multi-Tone
• SCCP — Signalling Connection Control Part
• DM — Differential Mode
• AS — Access System
• 3GPP — Third-Generation Partnership Project
• BIOS — Basic Input-Output System
• E — Echo
• TRS — Telecommunications Relay Service
• MAI — Multiple Access Interference
• EBIC — Electron Beam Induced Current
• N-AMPS — Narrowband Advanced Mobile Phone System
• C² — Command and Control
• CSR — Customer Service Request
• OOK — On/Off Keying
• ISSI — Inter-Switching System Interface
• DTN — Data Transfer Network
• EM — Electromigration
• BRAN — Broadband Radio Access Network
• BIC — Bus Interface Controller
• CGSA — Cellular Geographic Service Area
• TSE — Toronto Stock Exchange
• DMT — Digital-Discrete Multi-Tone
• CPC — Continous Packet Compression

• SIA — Securities Industry Association
• ASAS — All-Source Analysis System
• HUACA — Hang Up And Call Again
• SR — Service Request
• FTTP — Fiber To The Premises
• ACE — Adaptive Communication Environment
• BS — Backing Store
• # — Number sign, octothorp; special function key
• TDRS — Tracking and Data Relay Satellites
• COMB — Combined
• SAT — Satellite
• TOC — Telecommunication Operations Center
• SAPI — Service Access Point Identifier
• SPIN — Service Provider Identification Number
• VPC — Virtual Path Connection (ATM)
• SYSADM — System Administrator
• SLIC — Subscriber Line Interface Circuit
• CLP — Cell Loss Priority (ATM)
• SB — Switchboard
• AVR — Automated Voice Response
• INE — Intelligent Network Element
• SMSC — Short Message Service Center
• DXC — Digital Cross Connect
• MLM — Multi-Longitudinal Mode
• ADM — Administration, Office of
• TU — Transmission Unit
• GERAN — GSM (Global System for Mobile communications) Edge Radio Access Network
• WIS — WAN (Wide Area Network) Interface Sublayer
• * — Star, special function key
• DARTS — Design Approach for Real-Time Systems
• TCAP — Transaction Capabilities Application Part
• INMS — Integrated Network Management System
• CS-PDU — Convergence Sublayer - Protocol Data Unit
• PSS — Performance Support System
• LBS — Location-Based Services
• TCAM — Telecommunications Access Method
• CB — Citizens' Band
• AAV — Alternate Access Vendor
• UCM — Use Case Map
• WBMP — Wireless Bitmap
• SQ — Service Quality
• BOA — Basic Object Adapter
• DMI — Distributed Management Interface
• NA — Network Adapter
• BTN — Billing Telephone Number
• LSC — Link State Control
• BCST — Broadcast
• DDU — Disk Drive Unit
• SPID — Service Profile Identifier
• DLT — Delete

• RDS — Rate Determining Step
• V — Variable
• EGSM — Extended Global System for Mobile Communications
• A/D — Analog-to-Digital converter
• WAYP — White and Yellow Pages
• TMS — Time Management System
• WDN — Wireless Developer Network
• TEM — Transmission Electron Microscope
• CDPD — Cellular Digital Packet Data
• VPX — Virtual Path Cross-Connect
• EMR — Electromechanical Relay
• ATU-C — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Central office end
• SETI — Search for Extraterrestrial Intelligence
• HUP — Hook-UP
• ILEC — Incumbent Local Exchange Carrier
• WDA — Wireless Digital Assistant
• TDM — Time Division Multiplexing
• DM — Domain Model
• 802.11 HR — High data Rate IEEE 802.11 Wireless LAN protocol
• LH — Link Handler
• DTI — Digital Trunk Interface
• F/W — Firmware
• PC — Peripheral Controller
• ZCZ — Zero Correlation Zone
• LIM — Line Isolation Monitor
• WVPN — Wireless Virtual Private Network
• CMIS — Common Management Information Service
• TRANSEC — Transmission Security
• DSI — Digital Speech Interpolation
• EDFA — Erbium-Doped Fiber Amplifier
• DDD — Direct Distance Dialing
• PDL — Positioning Data Link
• P — Priority
• OODBMS — Object-Oriented Database Management Systems
• FDOA — Frequency Difference Of Arrival
• FGD — Feature Group D
• QSTN — Question
• ETOC — Electronic Table of Contents
• FGDC — Federal Geographic Data Committee's
• ARS — Automatic Route Selection
• UTL — Utility
• AAL5 — ATM (Asynchronous Transmission Mode) Adaptation Layer 5
• LASA — Large Aperture Seismic Array
• SD — Speed Dial
• TCS — Telephony Control Specification
• CGI — Computer Graphics Interface
• RS — Receive Signature
• VLP — Very Low Power
• EKTS — Electronic Key Telephone Set
• FB — Fine Business

• VG — Voice Grade
• REG — range extender with gain
• BNCC — Base Network Control Center
• ICI — Interexchange Carrier Interface
• MLA — Modern Language Association
• CELP — Code Excited Linear Prediction
• FPLMTS — Future Public Land Mobile Telecommunications System
• UNI — User Network Interface
• ADM 3X — DS3 Add-Drop Multiplex
• CCA — Carrier-Controlled Approach
• AWG — arrayed waveguide grating
• IG — Interface Group
• DME — Distributed Management Environment (OSF)
• LORAN — Long Range Aid to Navigation System
• TSB — Telecommunication Standardization Bureau
• SOH — Section Overhead
• LDM — Limited Distance Modem
• WAE — Wireless Application Environment
• TBCD — Telephony Binary Coded Decimal
• WNMS — Wireless Network Management System
• DCF — Distributed Coordination Function
• TON — IEEE/ACM Transactions On Networking
• ADC — Access Deficit Charge
• GOSIP — Government Open Systems Interconnection Profile
• MAPI — Messaging Applications Programming Interface
• CEPT — Conférence Européenne des Administrations des Postes et des Télécommunications
• BOSS — Binary Object Storage System
• GSM-R — Global System for Mobile (communications) – Rail
• SNIX — Single Noise Interference Xterminator
• GTB — Global Telecom Brokers
• ADCCP — Advanced Data Communication Control Procedures
• CND — Calling Number Display
• FTTK — Fibre To The Kerb
• 4WA — Four Wire Analog
• SINS — Ship’s Inertial Navigation System
• LOP-P — Loss Of Pointer - Path
• LP — Line Pair
• CAMEL — Customized Applications for Mobile-network Enhanced Logic
• CON — Concentrator
• LRQ — Location Request
• ECDIS — Electronic Chart Display Information System
• P2P — Person-to-Person
• DPT — Dynamic Packet Transport
• PMMA — Polymethyl Methacrylate
• SAS — Special Access Surcharge
• DOV — Data-Over-Voice
• SLV — Satellite-Launch Vehicle
• MMM — Mobile Media Mode
• CCS — Common Channel Signaling
• OML — Object Model Library

• RXQUAL — Received Signal Quality
• IMP — Interface Message Processor
• LDN — Local Directory Number
• LB — Local Battery
• ETF — Early Termination Fee
• CDM — Conceptual Data Model
• MBS — Maximum Burst Size (ATM)
• GOSIP — Government Open System Interconnection Profile
• VCC — Voice Call Continuity
• WATS — Wide Area Telecommunications Service
• FDI — Feeder Distribution Interface
• RAU — Remote Access Unit
• APPN — Advanced Peer-to-Peer Network
• MIN — Mobile Identification Number
• AWT — Agence Wallonne des Télécommunications
• RTU — Right to Use
• CD-ROM — Compact Disk-Read-Only Memory
• CMS — Conversational Monitor System
• CIP — Channel Interface Processor
• DNC — Do Not Call
• PACS — Personal Access Communications System
• CS — Central Station
• IBS — In-Building Solutions
• CP — Call Processing
• SCU — System Control Unit
• CFR-47 — Code of Federal Regulations Title 47 (FCC)
• CD ROM — Compact Disc Read-Only Memory
• 100VG — 100 Voice Grade (IEEE 802.12 AnyLAN Standard)
• 3GIP — Third Generation Internet Protocol
• SIM — Subscriber Identification Module
• CIC — Carrier Identification Code
• DAP — Distributed Array Processor
• EM — Element Manager
• BREW — Binary Runtime Environment for Wireless
• WSA — Wireless Security Auditor
• DCMES — Dublin Core Metadata Element Set
• MERIS — medium-resolution imaging spectrometer
• WFA — Wait for Answer
• PTM — Packet Transport Mode
• KSPS — KiloSymbols Per Second
• BA — Behaviour Aggregate
• KEK — Key Encrypting Key
• PMOS — P-channel Metal Oxide Semiconductor
• CPG — Converged Packet Gateway
• ELFEXT — Equal-Level Far-End Cross-Talk
• ALOC — Average Length Of Call
• FRF-LMI — Frame Relay Forum - Local Management Interface
• UTRAN — UMTS (Universal Mobile Telecommunication System) Terrestrial Radio Access Network
• ALI — Automatic Location Information
• NANP — North American Numbering Plan

• AARQ — A-Associate Request
• MMDS — Multichannel Multipoint Distribution Service
• ARPT — Autorité de Régulation des Postes et Télécommunications
• RPCU — Radio Port Control Unit
• AEA — American Electronics Association's
• TAX — Trunk Automatic Exchange
• TAM — Telephone Answering Machine
• DNI — Data Network Interface
• EMF — Event Management Framework
• MDN — Mobile Directory Number
• CT — Computer Terminal
• SNI — Subscriber Network Interface
• CACH — Call Appearance Call Handling
• COM — Comedy Central
• CU — Cooling Unit
• TSI — time-slot interchange
• CV — Coding Violation
• CAM — Common Access Method
• NICAD — Nickel Cadmium
• DNA — Digital Network Architecture
• FFH — Fast Frequency Hopping
• BUS — Business Units
• PTM — Point-To-Multipoint
• LFTYR — Ley Federal de Telecomunicaciones y Radiodifusión
• JWG — Joint Working Groupof
• GMSS — Global Mobile Satellite System
• TAPI — Telephony Application Programming Interface
• SCCS — Switching Control Center System
• DLL — Digital Local Line
• VGF — Voice Grade Facility
• TP — Transition Point
• WSP — Wireless Service Provider
• ETSI — European Telecommunications Standards Institute
• BCSM — Basic Call State Model
• LCP — Local Control Point
• AQP — Association for Quality and Participation
• DLU — Digital Line Unit
• BATM — Basic Telecommunication Access Method
• SN — Stock Number
• BORSCHT — Battery feed, Overvoltage protection, Ringing, Signaling, Coding, Hybrid, and Testing
• VP — Virtual Path (ATM)
• WTS — Wireless Telecommunications Symposium
• DE — Discard Eligible
• 3G — Third Generation (mobile communication system)
• FGA — Feature Group A
• RTC — Real-Time Control
• MH — Message Handler
• TWX — Teletypewriter Exchange Service
• TP-PMD — Twisted Pair Physical Medium Dependent
• CPH — Call Party Handling

• VN — Virtual Network
• CSLIP — Compressed SLIP
• IMPI — IP (Internet Protocol) Multimedia Private Identity
• RWIN — Receive Window
• PTI — Payload Type Indicator
• RNX — Restricted Numeric eXchange
• FOD — Fax on Demand
• SDSL — Symmetrical Digital Subscriber Line
• ATB — All Trunks Busy
• AIS-L — Alarm Indication Signal - Line
• BDSL — Broadband Digital Subscriber Line
• ACA — Adaptive Channel Allocation
• SN — Service Number
• AIS-P — Alarm Indication Signal - Path
• ILETS — International Law Enforcement Telecommunications Seminar
• MNOS — Metal-nitride-oxide Semiconductor
• VAR — Value-Added Reseller
• RBOC — Regional Bell Operating Company (Baby Bell)
• FNN — Full National Number
• AP — Action Point
• TSG — Telephone Security Group
• GAN — Global Area Network
• SMS — Service Management System
• EDSX — Electronic Digital Signal Cross-Connect
• LDI — Long Distance Interconnect
• LTU — Line Terminating Unit
• BHA — Busy Hour Attempts
• ROSE — Remote Operations Service Element
• ADC — Advanced Data Control
• UMTS — Universal Mobile Telecommunications Service
• VTIR — visible and thermal infrared radiometer
• TRX — Tandem Repeater eXchange
• ETOM — Enhanced Telecom Operations Map
• CTE — Computer Telephony Engineer
• CCCH — Common Control Channel
• LIF — Logical Interchange Format
• STE — Section Terminating Equipment
• RAI — remote alarm indication
• MF — Multiple Frequency
• MC — Maintenance Control
• BTS — Base Transceiver Station (cellular)
• CBWFQ — Class Based Weighted Fair Queueing
• CRS — Cell Relay Service
• AAL — ATM (Asynchronous Transmission Mode) Adaptive Layer
• ICL — Inserted Connection Loss
• GFI — General Format Identifier
• DDS — Dataphone Digital Service (AT&T)
• VLBI — Very Long Baseline Interferometry
• CD — Committee Draft
• DR — Design Review

• NSE — Network Software Environment
• E — Exchange
• FAC — Forced Authorization Code
• IDCP — Internet Device Control Protocol
• VFL — Visual Fault Locator
• MFC — Multi-Frequency Code
• NBP — Name Binding Protocol
• AIS-V — Alarm Indication Signal - Virtual
• CCS — Common Command Set
• SMDR — station message detail recording
• RX — Receiver
• LOB — Line Of Bearing/Balance
• AH — Authentication Header
• DTE — Digital Terminal Equipment
• ATS — Abstract Test Suite
• AAP — Alternate Access Provider
• SCCP — Signaling Connection Control Point
• TD — Transmit Data
• ULF — Ultra Low Frequency
• BOM — Bit-Oriented Message
• TRIG — Trigger
• CLCC — Ceramic Leaded Chip Carrier
• RICK — Repeater Interface Communications Kit
• IPNG — Internet Protocol, Next Generation (now called IPv6)
• PTCL — Pakistan Telecommunication Company Ltd
• EDC — Electronic Dispersion Compensator
• ADPC — Automatic Data Processing Center
• SDLC — Systems Development Life Cycle
• VSM — Vestigial Sideband Modulation
• INTELSAT — International Telecommunications Satellite
• NSEP — National Security Emergency Preparedness
• EC — Equipment Controller
• FXS — Foreign Exchange Subscriber
• DDI — Direct Dialing Incoming
• DS-3 — Digital Signal, Level 3
• MP — Modulation Parameter
• PGP — Pretty Good Protection (encryption)
• B-CPE — Broadband Customer Premises Equipment
• AB — Answer Back
• 4WE&M — Four-Wire Ear and Mouth
• CIP — Carrier Identification Parameter
• TCB — Telecommunication Certification Body
• RADSL — Rate Adaptive Digital Subscriber Line
• HU — Hook Up
• TUP — Telephone User Part
• LLA — Link Level Access
• GRUB — Greedy Reclamation of Unused Bandwidth
• CLASS — Custom Local Area Signaling Services
• AOC — ADSL (Asynchronous Digital Subscriber LIne) Overhead Control channel
• WRT/R — Wireless Transmitter/Receiver

• MSG — Management Steering Group
• EECM — End-to-End Call Manager
• SOHO — SOlar and Heliospheric Observatory
• TA — Terminal Adapter (ATM)
• DCAS — Downloadable Conditional Access System
• WDS — Wireless Distribution System
• ACF — Access Coordination Function
• SAP — Service Advertising Protocol
• ILD — International Long Distance
• NT — Network Termination
• ATB — Above-Ground Telecommunications Backbone
• NF — Noise Factor
• EC-N — Electrical Carrier (n=a number, e.g., EC-4)
• LS — Loop Start
• EF&I — Engineering, Furnishing and Installation
• SRA — Seamless Rate Adaptation
• MEECN — Minimum Essential Emergency Communication Network
• ET — Exchange Terminal
• LAPB — Link Access Protocol-Balanced
• PAM — Pulse Amplifier Modulation
• UNO — Universal Network Operations
• WFT — Wireline Formation Test
• GTM — Go to Meeting
• CLLM — Consolidated Link Layer Management
• CDA — Communications Decency Act's
• PSLV — Polar Satellite Launch Vehicle (Indian Space Research Organization; India)
• TJB — Telephone Junction Box
• CCS — Call Center Service
• UAN — Universal Area Network
• MRCA — Most Recent Common Ancestor
• DDP — Datagram Delivery Protocol
• FLL — Fixed-Loss Loop
• EVC — Electronic Voucher Charging
• SCR — System Change Request
• OTF — On-The-Fly (data acquisition method)
• MCD — Community Care Access Centre
• CRV — Call Reference Value
• LPDP — Local Policy Decision Point
• SOR — Statement of Requirements
• WLL — Wireless Local Loop
• STMR — Sidetone Masking Rating (telecommunications)
• CTIA — Cellular Telecommunications Industry Association
• 4WAI — Four-Wire Analog Interface
• AAV — Alternative Access Vendor
• RCP — Right-Hand Circular Polarization
• RDSS — Radio Determination Satellite Service
• VADB — Virtual Auto Dial Backup
• WE — Western Electric
• ASD — Alternative Service Delivery
• MIR — Maximum Information Rate

• M — Memory
• SSN — Switched Service Network
• ET — Electronic Transmission
• ATTRA — Appropriate Technology Transfer for Rural Areas
• ULL — Unbundled Local Loop
• AOS — Alternate Operator Service
• DMNG — Digital Mobile News Gathering
• CAP — Competitive Access Provider
• PCN — Personal Communications Networks (European PCS)
• LCF — Location Confirm
• UCF — Unregistration Confirm
• ACRE — Authorization and Call Routing Equipment
• AFCEA — Armed Forces Communications and Electronics Association's
• DTU — Date/Time Update
• CFOT — Certified Fiber-Optic Technician
• ZBTSI — Zero Byte Time Slot Interchange
• CSDU — Core Service Data Unit
• CLF — Carrier Line Failure
• DECT — Digital Enhanced Cordless Telecommunication
• TMRS — TRAFFIC MEASUREMENT AND RECORDING SYSTEMS
• LMT — Lightwave Microcell Transceiver
• WVOIP — Wireless Voice over Internet Protocol
• CTTC — Centre Tecnològic de Telecomunicacions de Catalunya
• DS-1 — Digital Signal, Level 1
• AAL2 — ATM (Asynchronous Transmission Mode) Adaptation Layer 2
• CSCW — Computer-Supported Cooperative Work
• SGSN — Serving GPRS (General Packet Radio Service) Support Node
• NICT — National Institute of Information and Communications Technology
• RSL — Remote Serial Link
• DPA — Distributed-Power Architecture
• CAPTAIN — Character And Pattern Telephone Access Information Network
• XNS — Xerox Network Systems
• FLN — Fixed Line Network
• PMT — Program Management Team
• CRBT — Color Ring Back Tone
• RAD — Recorded Announcement Device
• BPP — Billed Party Preference
• TEHO — Tail End Hop Off
• LEED — Low-energy Electron Diffraction
• DTAP — Direct Transfer Application Process
• CAE — Common Application Environment
• NCF — Network Control Facility
• DSVD — Digital Simultaneous Voice and Data
• ESCON — Enterprise System Connection
• WTNM — Working Telephone Number Management
• DRQ — Disengage Request
• RCU — Radio Control Unit
• RRC — Root Raised-Cosine
• FCA — Fixed Channel Allocation
• OMF — Object Management Framework

• LCN — Local Communications Network
• FT1 — Fractional T1
• IMT-2000 — International Mobile Telecommunications 2000
• FECC-F — Forward Error Correction Count - Fast data
• CMA — Communications Management Association
• MA — Maintenance Action
• VDSL — Very high-speed Digital Subscriber Line
• MPU — Main Processor Unit
• DCO — Dial Central Office
• TMF — Telecommunications Management Forum
• PROV — Provisioning
• ACM — Address Complete Message
• IBSS — Independent Basic Service Set
• BB — Blackberry
• WIN — Wireless Intelligent Network
• FESS — Flywheel Energy Storage System
• BT — Burst Tolerance
• ATU-R — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Remote terminal end
• BSC — Bi-Synchronous Communications
• TSC — Test System Controller
• CE — Channel Element
• NEF — Network Element Function
• ADIF — Accounting Data Interchange Format
• ESM — electronic support measure
• GSM — Global System for Mobile telecommunications
• ADF — Application Dedicated File
• DC — Device Control
• DOD — Direct Outward Dialing
• COP — Character Oriented Protocol
• SSU — Synchronization Supply Unit
• SLIC — Subscriber Loop Interface Circuit
• CCCI — Command, Control, Communications and Intelligence
• SACS — Security Access Control System
• BASIZE — Buffer Allocation Size
• CFS — Call for Service
• ATIS — Alliance for Telecommunications Industry Solutions
• DTL — Defense Telephone Link
• ZLE — Zero-Latency Enterprise
• 2G — Second-generation mobile telephone system
• AIU — Analog Interface Unit
• OMP — Open Management Platform
• APS — Advanced Power System
• OSD — Onscreen Display
• PIH — Pin in Hole
• DNSIX — Defense Network Security Information Exchange
• LBX — Low Bandwidth X
• CDR — call detail recording
• VHM — Voice Health Monitor
• DLT — Digital Line Termination
• SN — Switching Network

• CPN — calling party number
• ACL — Asynchronous Connection-less Link
• SCORM — Shareable Content Object Reference Model
• LCU — Lightweight Computer Unit
• WNAN — Wireless Neighborhood Area Network
• CRL — Computing Research Laboratory
• RFR — Radio Frequency Radiation
• CTO — Commonwealth Telecommunications Organisation
• TIMS — Telephone Information Management System
• FUD — Fair Use Doctrine
• 4G — Fourth Generation
• SGCP — Simple Gateway Control Protocol
• FI — Format Identifier
• MSS — Mobile Satellite Service
• VOB — Voice Over Broadband
• ANAC — An Automatic Number Announcement Circuit
• ECSA — Exchange Carriers Standards Association
• B-ISDN — Broadband ISDN
• BTP — Business Telecom Products, Inc.
• NMC — Nortel Matra Cellular
• CPOP — Circuit Precedence Over Packet data
• LULT — Line Unit/Line Termination
• QLLC — Qualified Logical Link Control
• MEH — Mobile-Executed Handoff
• LAP-B — Link Access Procedure - Balanced
• ABR — Available Bandwidth Rate
• QOSM — Quality of Service Management
• EADAS — Engineering and Administrative Data Acquisition System
• QOTS — Quality Of Telephone Services
• CDVT — Cell Delay Variation Tolerance
• DDU — Digital Data Unit
• PTE — Path Terminating Equipment (SONET)
• ISD — International Subscriber Dialling
• TESMA — Telecommunications Equipment and Services Master Agreement
• VO — Voice Only
• AMTFT — Active Matrix Thin Film Transistor
• VSAT — Very Small-Aperture Terminal
• ALCAP — Access Link Control Application Protocol
• REN — Ringer Equivalence Number
• NSN — National Significant Number
• ANSI — Advanced Network Signaling Input
• TCL — Transverse Conversion Loss
• DPT — Dial Pulse Terminate
• STD — Standard Deviation
• ACNA — Access Customer Name Abbreviation
• SC — Switching Center
• BIS — Brought Into Service
• AVT — Audio Visual Telecommunications
• QS — Quasi-Synchronous
• CNI — Calling Number Identification

• SMAS — Service Management System
• BSRF — Basic System Reference Frequency
• DPST — Double-Pole Single-Throw
• FMR — Follow Me Roaming
• WPC — Wireless Personal Communications
• TP — Telephone Pole
• THZ — TeraHertz
• RTB — Retransmission Buffer
• PFE — Power Feed Equipment
• P&A — Privacy and Authentication
• PD — Pulse Duration
• TLC — Television the Learning Channel
• WPBX — Wireless Private Branch Exchange
• LCU — Line Control Unit
• COFA — Change Of Frame Alignment
• BHCC — Busy Hour Call Completions
• RJ-11 — Registered Jack type 11 (4-wire connector)
• FC — Frame Control
• CBMS — Computer-Based Message System
• EEROM — Electronically Erasable Read-Only Memory
• RDT — Recall Dial Tone
• UIT — Union Internationale des Télécommunications
• MDRAM — Multibank Dram
• PVN — Private Virtual Network
• WDSL — Wireless Digital Subscriber Line
• LIDB — Line Information DataBase
• NFR — Near-Field Recording
• DTU — Data Terminal Unit
• DIL — Direct Inward Line
• ADM — Administration Building
• VDSL — VHBR (Very High Bit Rate) Digital Subscriber Line
• TMTC — Telemetry and Telecommand
• AGCH — Access Grant Channel
• BAF — Bellcore AMA (Automatic Message Accounting) Format
• AA — Auto-Answer
• CMTS — Cellular Mobile Telephone System
• ETB — Empresa de Telecomunicaciones de Bogotá
• CDA — Communications Decency Act of 1996
• SMU — Service Management Unit
• MIS — Marketing Intelligence System
• FMS — Fixed Mobile Substitution
• EMV — EuroPay, MasterCard, Visa
• RCMAC — Recent Change Memory Administration Center
• CRTS — Cellular Radio Telecommunications Service
• ARFA — Allied Radio Frequency Agency
• SBX — Small Business Exchange
• PJC — Pointer Justification Count
• LMBCS — Lotus Mult-Byte Character Set
• TT — Text-Telephone
• DPDT — Double-Pole Double-Throw

• VTQ — Voice Transmission Quality
• VOFR — Voice Over Frame Relay
• BPSK — Binary Phase-shift Keying
• DPBX — Digital Private Branch Exchange
• DUL — Dial-Up List
• BAM — Basic Access Module
• APPC — Advanced Program-to Program Communications
• UCA — Utility Communications Architecture
• MQFP — Metric Quad Flat Pack
• ATIS — Automatic Transmitter Identification System
• TCA — Threshold Crossing Alert
• DORA — EV-DO (EVolution-Data Optimized) standard Revision A
• NC — Network Channel
• SDP — Software Development Process
• FPS — Framing Pattern Sequence
• VOB — Versioned Object Base
• LAT — Local Area Transport (network)
• DACS — Digital Access Cross-Connect Switch
• WFG — Wireless Firewall Gateway
• IR — International Roaming
• CM — Common Mode
• DCSS — Digital Cross-connect Systems
• QPA — Quality Performance Analysis
• MCR — Minimum Cell Rate (ATM)
• OA&M — Operations, Administration & Maintenance
• CSTA — Computer Supported Telecommunications Applications
• LRF — Laser Range Finder
• IVP — Integrated Voice Protocol
• DACS — Digital Access Carrier System
• TPSP — Third Party Service Provider
• USA — Underground Service Alert
• TCC — Transmission Control Code
• CCC — Clear Channel Capability
• ITU-T — International Telecommunication Union - Telecommunications section
• INSAT — Indian National Satellite
• RTFM — Read The Friendly Manual
• VR — Virtual Router
• COC — Central Office Connection
• VDR — Voice Digitization Rate
• A/V — Audiovisual
• AADS — Ameritech Advanced Data Services
• JWP — Joint Working Party
• DCS — Digital Cross-connect Switch
• IPXCP — Internetwork Packet Exchange Control Protocol
• PVG — Personal Voice Greeting
• VNS — Virtual Network System
• MA — Message Analysis
• WIVO — WIreless VelOcity
• IMTS — Improved Mobile Telephone Service
• JMA — Japanese Meteorological Agency

• ALI — Automatic Location Identifier
• TLP — Transmission Level Point
• NECA — National Exchange Carrier Association
• PCCA — Portable Computer Communications Association
• CCH — Common Channel Handler
• PSQM — Perceptual Speech Quality Measure
• RLC — Reverse Link Channel
• 888 — Freephone
• TSDU — Transport Service Data Unit
• WIM — WAP (Wireless Application Protocol) Identity Module
• RTT — Roof Top Tower
• HCV — High Capacity Voice
• PDSO — Packet Data Security Overlay
• TPS — Telephone Preference Service
• TNMS — Telecommunications Network Management System
• SRU — Search and Rescue Unit
• CPAP — Customer Premises Access Profile
• UDP — Up Down Pair
• TTC — Telemetry Telecommand and Control
• ADTM — Asynchronous Data Transfer Mode
• MTS — Message Telecommunications Service
• DECCO — DISA Defense Commercial Communications Office
• DTW — Dynamic Time Warping
• VQA — Voice Quality Analyzer
• MB — Measured Business
• RLA — Received Level Average
• 800 — Freephone
• GLT — Great Lakes Telecom
• CCP — Compression Control Protocol
• FR-SSCS — Frame Relay Service Specific Convergence Sub-Layer
• ACTS — Automated Coin Toll System
• EPL — Echo Path Loss
• CAN — Controller Area Network
• LSMS — Local Service Management System
• SHR — Self-Healing Ring
• PVG — Packet Voice Gateway
• CATI — Computer-Assisted Telephone Interviewing
• CDM — Configuration Data Manager
• DDM — Data Distribution Manager
• RTU — Remote Test Unit
• EUMETSAT — European Meteorological Satellite
• WFA — Work Force Administration
• JEDEC — Joint Electronic Devices Engineering Council
• DFT — Draft
• CLD — Cross-Layer Design
• NSDI — National Spatial Data Infrastructure
• ADAD — Automatic Dialing Announcing Device
• TCM — Time Compression Multiplexer
• EM — Engineer(ing) Manual
• LRM — Long Reach Multimode

• TOMS — Telecom Operations Management System
• PSDN — Public Switched Digital Network
• VTI — Vietnam Telecom International
• VLF — Vertical-Laminar-Flow
• ADTS — Ameritech Digital Transport Service
• SSCP — System Services Control Point
• IRAC — Internal Review and Audit Compliance
• FLC — Forward Link Channel
• ELSEC — Electronic Security
• HBH — Hop-By-Hop
• DS-2 — Digital Signal, Level 2
• DCEF — Distributed Cisco Express Forwarding
• HDSL2 — High-bit-rate Digital Subscriber Line, Second Generation
• YIP — Your Internet Phone
• WDP — Wireless Datagram Protocol
• GOMP — Get Off My Phone
• RTC — Right to Carry
• BSS — Broadband Switching System
• NARC — Non-Automatic Relay Center
• EDGE — Enhanced Data for GSM (Global System for Mobile communication) Evolution
• CD-R — Compact Disk-Recordable
• VSC — Vertical Service Code
• VPDN — Virtual Private Dial-up Network
• NESC — National Electrical Safety Code
• DSCS — Defense Satellite Communication System
• ABATS — Automatic Bit Access Test System
• PLE — Path Length Efficiency
• AEIMP — Apple Event Interprocess Messaging Protocol
• SAA — Service Adaptive Access
• RID — Routing Identifier
• EGPRS — Enhanced General Packet Radio Service
• BCIX — Berlin Commercial Internet Exchange
• SS — Switching System
• QPM — QoS (Quality of Service) Policy Manager
• ACMA — Atlantic Cable Maintenance Agreement
• IRLAP — InfraRed Link Access Protocol
• MNA — Multi-Network Area
• AMC — Adds, Moves and Changes
• IDCU — Integrated Digital Carrier Unit
• LTU — Line Termination Unit
• GS — Ground Start
• PNM — Pulse Number Modulation
• AFPS — Automatic Facility Protection Switching
• STN — Station Terrienne de Navire
• BWX — Broadband Wireless Exchange
• VTA — Vermont Telecommunications Authority
• TLM — Trouble Locating Manual
• DLE — Digital Local Exchange
• ECS — Encryption Control Signal
• DPDCH — Dedicated Physical Data Channel

• CNID — Calling Number Identification Display
• CWTS — China Wireless Telecommunication Standard
• C — Connectivity
• ANT — ADSL Network Terminator
• FEBE-F — Far End Block Error count - Fast data
• LZ — Lempel-Ziv compression algorithm
• CIPOA — Classical Internet Protocol over ATM (Asynchronous Transfer Mode)
• CPN — Customer Premise Network
• MVDS — Microwave Video Distribution System
• AON — All-Optical Network
• NCOS — Network Class Of Service
• IVN — Interactive Video Network
• UDT — Unreliable Data Transfer
• FR — Functional Requirement
• USPI — Universal Serial Phone Interface
• SR — Scanning Radiometer
• WTL — Wireless Transport Layer
• WEDE — Wireless Enterprise Delivery Environment
• CAS — channel associated signaling
• CEPT — Conference of European Posts and Telecommunications
• SDCCH — Standalone Dedicated Control Channel
• DTR — Down-Time Ratio
• NRI — Net Radio Interface
• WAWS — Washington Area Wideband System
• C/T — Carrier to Noise Temperature Ratio
• SQL — Specified Quality Level
• MAPDU — Management Application Protocol Data Unit
• ATL — Advanced Technology Laboratory
• MDCP — Media Device Control Protocol
• MOC — Maintenance and Operations Console
• STP — Shielded Twisted Pairs
• PRM — Performance Report Message
• MCD — Mobile Communications Division
• IDLC — Integrated Digital Loop Carrier
• LADS — Local Area Data Service
• TRCSL — Telecommunications Regulatory Commission of Sri Lanka
• AAPR — Annual Average Performance Ratio
• SCC — Specialized Common Carrier
• VMU — Virgin Mobile USA (mobile phone network)
• GCS — Global Communication System
• DACS — Digital Access and Cross-Connect System
• PSN — Packet-Switched Network
• 802.X — Series of LAN standards developed by IEEE
• INA — Information Network Architecture
• ESA — Enhanced Subscriber Authentication
• VVP — Versatile Voice Processing
• CPCI — Compact Peripheral Component Interconnect
• AMOLED — Active Matrix Organic Light-Emitting Diode
• IDD — International Direct Dialing
• ESG — Enhanced Service Gateway

• GEO — Geostationary Earth Orbit
• SPI — Security Parameters Index
• OCI — object code insertion
• CSR — Customer Service Report
• ITFS — International Toll Free Services
• MEI — Multiple Extension Interworking
• LMU — Line Monitor Unit
• TI — Time
• LCT — Large Capacity Tandom
• CLOS — Clear Line Of Sight
• NAM — Numeric Assignment Module
• EC — Enhanced Cellular
• CM — Connection Manager
• WLAP — Wireless LAN (Local Area Network) Access Point
• ENS — Enhanced Network Services
• EXCL — Exclusive
• ERI — Enhanced Roaming Indicator
• 3RNGR — Three Ringer
• MODEM — modulation and demodulation
• CHT — Active
• CALA — Customer Address Location Area
• CFNA — Call Forwarding No Answer
• BP — Block Parity
• CID — Craft Interface Device
• WDM — Windows Driver Model
• MOC — Ministry of Communications
• VGC — Voice Grade Channel
• COBE — Corporate Owned Business Only
• SMDS — Switched Multi-megabit Data Service
• IMT-FT — International Mobile Telecommunications - Frequency Time
• BDFB — Battery Distribution Feeder Bay
• ERM — Explicit Rate Marketing
• STARS — Software Technology For Adaptable, Reliable Systems
• UOS — Units of Service
• MITS — Metaphors for Integrated Telecommunications Services
• CLASS — Cell Level ATM (Asynchronous Transfer Mode) Services Simulator
• DBN — Dial-Back Number
• AAR — Automatic Alternate Routing
• CT — Cordless Telecommunications
• DEO — Digital End Office
• B-ISUP — Broadband ISDN User Part
• NMC — Network Model Coverage
• VQT — Voice Quality Testing
• ATL — Atlanta
• FDMMA — Frequency Division Multiplexing Multiple Access
• RSN — Readable Serial Number
• AMEL — Active-matrix Electroluminescent
• TACS — Total Access Cellular System
• AWA — Advanced Wireless Access
• FEAC — Far End Alarm and Control

• ATMS — automatic transmission measuring system
• DS0 — Digital Signal Zero
• TRAC — Totally Reconfigurable Analog Circuit
• QOV — Quality of Voice
• TP — Termination Point
• DISA — Direct Inward Switch Access
• SHD — Smart Handheld Device
• CAL — Customer Access Line
• AL — Alignment
• CC — Composite Clock (SONET)
• TASI — Time Assigned Speech Interpolation
• N-AMPS — Narrowband Advanced Mobile Phone Service
• OID — Object Interaction Diagram
• FTAM — File Transfer Access and Manipulation
• TAU — Test Access Unit
• TD-SCDMA — Time-division Synchronous Code-division Multiple Access
• ADTS — Automated Digital Terminal System
• AFIPS — American Federation of Information Processing Societies
• FRSS — Frame Relay Switching System
• RP — Radio Port
• WDMW — Web Directory for Mobile and Wireless
• IPCDN — IP over Cable Data Networks
• INAP — Intelligent Network Application Part
• CEE — Communaut? Economique Europ?enne
• SVW — Sioux Valley Wireless
• TCBH — Time Consistency Busy Hours
• ITA — Illinois Telecommunications Association
• SJR — Signal-to-Jamming Ratio
• D3 — Digital channel bank, Third generation
• OIM — Operations Interface Module
• LGE — Loop- or Ground-start Exchange
• LI — Length Indicator
• PSPDN — Packet Switched Public Data Network
• KTF — Korea Telecom Freetel
• ULP — Upper Layer Protocol
• EFD — Event Forwarding Discriminator
• TARP — Target Identifier Address Resolution Protocol
• OMC — Operations and Maintenance Centre
• SM — Spectrum Management
• CMAS — Cellular Management System
• DCID — Downstream Channel ID
• UVG — Universal Voice Grade
• NMS — NetWare Management System
• WTA — Western Telecommunications Alliance
• RANAP — Radio Access Network Application Part
• UR — User Rate
• MT — maintenance
• M2M — Multipoint-to-Multipoint
• WNAP — Wireless Network Access Point
• S-HTTP — Service Hypertext Transport Protocol

• V — Vector
• FOE — Fiber Optic Equipment
• T&R — Tip and Ring
• EC — Entropy Coding
• GVPN — Global Virtual Private Network
• PTN — Provider Telecommunications Network
• VGCP — Voice Grade Channel Processor
• SAMA — Spread Aloha Multiple Access
• PTT — Post, Telephone, and Telegraph (authority)
• CR — Connection Request
• TFL — Telecom Fiji Limited
• FD — Full Duplex
• HQGSM — High-Quality Global System for Mobile communications
• DCC — Digital Control Channel
• SAMI — Structured Adjustment & Maintenance Interface
• SAMS — Service Agreement Management System
• RCF — Remote Call Forwarding
• ML-PPP — Multilink Point-to-Point Protocol
• BFS — Broadcast File System
• OPS/INE — Operations System/Intelligent Network Element
• RXP — Roaming Exchange Protocol
• CCSS6 — Common Channel Signaling System # 6
• EML — Element Management Layer
• LVM — Line Verification Module
• TACSIM — Tactical Simulation (Simulator)
• NPSI — Network Packet Switching Interface
• ASA — Avaya Site Administration
• CAS — Customer Accounts Service
• UIF — User Interface Framework
• IOC — Interoffice Channel
• UPC — Usage Parameter Control
• TRANS — Transaction
• BTO — Betts Telecom Oklahoma
• TPF — Transmission Priority Field
• CMISE — Common Management Information Service Element
• SCRC — SCCP Routing Control
• LVDS — Low-Voltage Differential Signalling
• PNE — Path Number Efficiency
• DBF — Digital Beam-Forming
• CODEC — Coder-Decoder (usually for audio/video data)
• DAF — Directory Access Function
• VCR — Videocassette Recorder
• TWL — Leased Teletypewriter Service
• WISP — Wireless Internet Service Provider
• HPN — Home Phone Network
• PCIA — Personal Communications Industry Association
• PTN — Public Telephone Network
• FIC — Flight Information Center
• AI — Adapter Interface
• SAR-PDU — Segmentation And Reassembly Protocol Data Unit

• UDS — Universal Directory Service
• ILF — Initial License Fee
• NMF — Network Management Forum
• QOD — Quality of Data
• VAB — Vehicle Assembly Building
• AMTI — Airborne Moving Target Indicator
• D-AMPS — Digital Advanced Mobile Phone Service
• VCA — Voice Connecting Arrangement
• BTU — Basic Transmission Unit
• AEE — Agent Execution Environment
• LTU — Line Test Unit
• HUMAN — High-speed Unlicensed Metropolitan Area Network
• D/I — Drop and Insert
• BT — Back Trace
• CSL — component sublayer
• BMAS — Business Management System
• QNC — Quick Net Connect
• PRE — Preliminary
• TNI — Telephone Network Interface
• ISDP — Intelligent Shared Dual Path
• CCITT — Comite Consultatif International Telegraphique et Telephonique (now ITU-T)
• CNE — Certified Novell Engineer
• ISDNUP — Integrated Services Digital Network User Part
• LEC — Liquid Encapsulated Czochralski
• WBI — Wireless Broadband Internet
• USF — Universal Server Farm
• SNAP — Sub-Network Access Protocol
• ATACS — Army Tactical Communications System
• ICSF — Internet Connection Sharing and Firewall
• WPKI — Wireless Public Key Infrastructure
• DCU — Distribution and Control Unit
• D/A — Digital-to-Analog converter
• IMT-A — International Mobile Telecommunications - Advanced
• NQA — Niveau de Qualite Acceptable
• IOT — Interoffice Trunk
• PHIGS — Programmer's Hierarchical Interactive Graphics System
• DRTL — Dial Repeating Tie Line
• TTG — Test Tone Generator
• DDSN — Digital Derived Services Network
• SWIFT — Society Of Worldwide Interbank Financial Telecommunications
• ICTA — Idaho Cable Telecommunications Association
• VPL — Virtual Path Link (ATM)
• ETS — End of Transmission Signal
• 3WC — Three Way calling
• ESDS — Electrostatic Discharge Sensitive
• STN — Stansted Airport railway station
• FTTE — Fiber to the telecom enclosure
• DAVIC — Digital Audio Video Council
• LLB — Line LoopBack
• C³ — Command, Control and Communications

• NML — Network Management Layer
• E-TDMA — Expanded Time Division Multiple Access
• IPN — Intelligent Peripheral Node
• RYP — Russian Yellow Pages
• CALC — Customer Access Line Charge
• ETT — Emerging Telecommunications Technologies
• TADS — Target Acquisition Designation Sight
• SCMG — SCCP Management
• TI — Telecom Implementation
• XWI — XML (extensible markup language) for Wireless Images
• TXS — Telephone eXchange Strowger
• ISP — International Signaling Point
• USOC — Universal Service Order Code (cable colors)
• SSP — Security Service Provider
• UAC — Uniform Annual Charge
• TCIYP — Turks and Caicos Islands Yellow Pages
• QR — Quality record
• CVT — Circuit Validation Test
• SNI — Service Node Interface
• RBT — Ring Back Tone
• SMASE — Systems Management Application Service Element
• DSX — Digital Signal Cross-Connect
• DTAM — Document Transfer and Manipulation
• ENUM — tElephone NUmber Mapping
• WAVE — Wireless Access in Vehicular Environments
• SES — Scientific and Engineering Software
• RCT — remote Control Terminal
• S&F — Store & Forward
• TSC — Technical Standards Committee
• RCR — Research and Development Center for Radio Systems
• WPOS — Wideband Packet over SONET (Synchronous Optical NETwork)
• SMLC — Serving Mobile Location Center
• IDPR — Interdomain Policy Routing
• DORK — Disciples Of The Righteous King
• VMO — Virtual Mobile Operator
• ELEC — Enterprise Local Exchange Carrier
• LMS — Location and Monitoring Service
• MMJ — Modified Modular Jack
• TWX — Teletypewriter Exchange (Telex)
• QC — Quality Circle
• BPOP — Building Point of Presence
• ISTD — International Subscriber Trunk Dialing
• TVRO — Television Receive-Only
• FHMA — Frequency Hopping Multiple Access
• CSAP — Core Service Access Point
• STUN — Simple Traversal of UDP (User Datagram Protocol) through NAT (Network Address Translation)
• DTS — Digital Terminal Systems
• AFRINIC — African Network Information Centre
• AUSPI — Association of Unified Telecom Service Providers of India
• CARS — Community Antenna Relay Service

• ARDIS — Advanced Radio Data Information Service
• DS-4 — Digital Signal Level 4
• ROC — Receiver Operating Characteristic
• TRAI — Telecom Regulatory Authority of India
• SF — Superframe
• DS — Delivery System
• RU — Release Unit
• RBS — Robbed Bit Signaling
• IATA — Intelligent Agents for Telecommunication Applications
• DMS — Distribution Management System
• UDC — Universal Digital Channel
• BC — Basic Call
• WGX — Wireless Gateway Switch
• RFH — Remote Frame Handler
• TFO — Tandem Free Operation
• WBOK — Wireless Broadband of Oklahoma
• RCH — Receive Channel
• LQR — Line Quality Report
• AASR — Abbreviated Access Service Request
• PSDS — Packet Switched Data Service
• RZ — Return to Zero
• PI — Processor Interface
• PTT — Post Telegraph and Telecommunications
• MC — Management Center
• ACEK — Authentication Encryption Key
• ITAD — Integrated Telephone Answering Device
• BSSMAP — Base Station System Management Application Part
• HDB3 — High-Density Bipolar Three-bit substitution
• FEBE-I — Far End Block Error count - Interleaved data
• RCQS — Roaming Call Quality Sensor
• IMPCS — Indian Mobile Personal Communication System
• STAN — Supply of Telstra Account Number
• IDSL — ISDN (Integrated Services Digital Network) Digital Subscriber Line
• WBTS — Wireless Business Telephone System
• WCMP — Wireless Control Message Protocol
• SE — Southeast Euro
• USD — Universal Service Directive
• DOD — Dial on Demand
• O/G — Outgoing
• PC — Project Coordinator
• VOX — Voice Operated Transmission
• ALIS — Access Lines in Service
• SEM — Sionscanning Electron Microscopy
• HPPI — High-Performance Parallel Interface
• GOS — Gerry Otis Simpson
• IDEN — Integrated Dispatch Enhanced Network
• WIPS — Wireless Intelligent Personal Server
• PMD — Physical Media-Dependent
• EA — Emergency Action(s)
• SPT — System Page Table

• IR — Information Request
• CSV — Circuit Switched Voice
• NR — Nummer
• MNOC — Mobile Network Operation Center
• CANARIE — Canadian Network for Advancement of Research, Industry, Education
• SAM — Service Access Multiplexer
• WLNP — Wireless Local Number Portability
• DLCS — Digital Loop Carrier System
• 3WO — Third Wire Open
• FWS — Fixed Wireless Services
• FOTS — Fiber Optical Transmission System
• NBDP — Narrow Band Direct Printing
• ISSP — Interim Interswitch Signaling Protocol
• TWA — The Wireless Association (former Cellular Telecommunciations and Internet Association)
• WTA — Wireless Telephony Applications
• SPCS — Stored Program Control Switch
• AGPS — Assisted Global Positioning System
• MHD — Maximum Hour Demand
• LQD — Line Quality Disturbance
• JSR — Jump to Subroutine
• BTE — Broadband Terminal Equipment
• WTC — Wireless Topic Center
• ECC — Extended Community Calling
• CSAA — Central Service Area Authority
• COI — Community of Interest
• WIRC — Wireless Information Resource Center
• DM — delta modulation
• MVD — Motion Vector Data
• SCE — Service Creation Environment
• ZD — Ziff-Davis
• PAGCH — Paging and Access Grant Channel
• WAW — Wide Area Wireless
• RDTD — Restricted Differential Time Delay
• TSR — Terabit Switch/Router
• VASP — Value-Added Service Provider
• PM — Processable Mode
• CITR — Canadian Institute for Telecommunications Research
• IRAC — Interdepartment Radio Advisory Committee
• ECC — Emergency Communications Center
• CCBS — Completion of Call to Busy Subscriber
• CDSL — Consumer Digital Subscriber Line
• PRM — Premium Rate
• SIO — Service Information Octet
• CMOS — Cellular Management Operation System
• UPS — Un-interruptable Power Supply
• CSAC — Computer Science Accreditation Commission
• TDR — Time Domain Reflectometer
• MOA — Managed Object Agent
• AAS — Automatic Announcement Subsystem
• MBAC — Measurement-Based Admission Control

• WAL — WATS (Wide Area Telecommunications Service) Access Line
• LDB — Last Data Bit
• APS — American Protective Services
• STU — Signal Transmission Unit
• ICCF — Interexchange Carrier Compatibility Forum
• LXT — Local Exchange Terminal
• LO — Lockout
• ICLD — Inter-Channel Level Difference
• RSS — Received Signal Strength
• ITCC — Information Technology and Communications Complex
• P — Point
• CCC — Credit Card Calling
• ITOC — Independent Telephone Operating Company
• SIGTRAN — Signaling Transport
• PPV — Pay-Per-View
• STMB — Space-Time Multiple Beam
• DCB — Digital Channel Bank (Sprint)
• WCA — Wireless Cable Association International
• EA — expedited acknowledgement
• FRAD — Frame Relay Assembler/Disassembler
• VMWI — Voice Message Waiting Indicator
• LOF — Loss of Frame (ATM)
• MTBM — Mean Time Between Maintenances
• PSC — Picture Start Code
• FECC-I — Forward Error Correction Count - Interleaved data
• TI — Time Integration
• BETRS — Basic Exchange Telecommunications Radio Service
• TSAR — Terminating Switched Access Rate
• FCT — Fixed Cellular Terminal
• WSL — Wireless Systems Laboratory
• LOH — Line Overhead
• CIS — Center for Integrated Systems
• UBC — Utility Based Computing
• LAP-B — Link Access Protocol-Balanced
• AS — Active Service
• NSPE — National Society of Professional Engineers
• YAC — Yet Another Caller-ID program
• CTIT — College of Telecommunications and Information Technology
• KBS — Kilobits per Second
• DH — Delivery Head
• BGP4 — Border Gateway Protocol 4
• OC-1 — Optical Carrier Signal, Level 1
• CCC — CDMA Cluster Controller
• CMAP — Connection Management Access Protocol
• LBA — Location-Based Advertising
• SVI — Service Interception
• MTIE — Maximum Time Interval Error
• D4 — Digital channel bank, Fourth generation
• EOI — End of Image
• ISM — Interstellar Medium

• INWATS — INward Wide Area Telecommunications Service
• REGEN — Regenerator
• ARJ — Admission Reject
• FACS — Facility Assignment and Control System
• NARSAP — National Advanced Remote Sensing Application Program
• NF — Not Found
• QQS — QOS (Quality Of Service) Query Service
• DNA — Do Not Answer
• VDV — Voice/Data/Video
• STN — Station Terrestre de Navire
• JDC — Japan Digital Cellular
• COMPANDER — COMpressor/exPANDER
• VOX — Voice Exchange
• LUL — Land Use Line
• LRB — Loop Reverse Battery
• WAPI — Wireless LAN Authentication and Privacy Infrastructure
• CONS — Connection-oriented Network Services
• OC-48 — Optical Carrier Signal, Level 48
• UASL — Unified Access Service License
• RA — Requirements Analysis
• DLE — Digital Line Equipment
• ULC — Universal Line Card
• TMF — Telemanagement Forum
• QEDI — Quod Erat Demonstrandum
• RFIDAI — Radio Frequency IDentification Association of India
• LRF — Location Registration Function
• LATA — Local Access Transport Area
• NR — normal
• IC-POT — Interexchange Carrier-Point of Termination
• MMDS — Multichannel Multipoint Distribution System
• DOITT — Department of Information Technology and Telecommunications
• LGS — Loop- or Ground-start Subscriber
• NMAS — Network Management System
• MVDM — Multiple Virtual DOS Machine
• MLHG — Multi-Line Hunt Group
• DTAU — Digital Test Access Unit
• ICC — Interexchange Carrier Charge
• RDI-L — Remote Defect Indicator - Loop
• DMI — Digital Multiplex Interface
• DFT — Draft Tax Forms
• WAGN — West Antarctic GPS (Global Positioning System) Network
• OLEC — Other Local Exchange Carrier
• SMDS — Satellite Multimedia Delivery System
• IPT — Internet Protocol Telephony
• RSL — Request and Status Links
• DDSD — Delay Dial Start Dial
• ALT — Automatic Link Transfer
• DTC — Department of Telecommunications and Cable
• XOT — X.25 Over TCP (Transmission Control Protocol)
• DECT — Digital Enhance Cordless Telecommunications

• EDT — European Deaf Telephone
• SS6 — Signalling System 6
• GPBX — Global Private Branch eXchange
• WSN — Wireless Sensor Network
• LRN — Local Routing Number
• WARP — Wireless ATM (Asynchronous Transmission Mode) Research Project
• NFF — Neutral File Format
• AVD — Alternate Voice/Data
• DTV — Digital Television
• CSCC — coordinated state change control
• ASTE — Advanced Systems and Telecommunications Equipment
• CC — Coordination Center
• WTDC 98 — World Telecom Development Conference 1998
• WOIP — Wireless communications over Internet Protocol
• MLMS — Mobile Learning Management System
• BLP — Burst Loss Probability
• SSTC — Subsystem Status Test Control
• BU — Back Up
• DRTT — Dial Repeating Tie Trunk
• CELL — Caller Enabled Leased Line
• AT — Attenuation
• MHL — Mobile High-definition Link
• CLIP — Caller Line Identification Presentation
• VDT — Video Dial Tone
• APTG — Asia Pacific Telecom Group
• SCU — Service Creation Unit
• CF — Coin First Payphone
• RDF — Remote Distribution Frame
• MSO — Marine Safety Office(r)
• CCEA — Cross Connect Equipment Assignment
• JYP — Jamaican Yellow Pages
• WFFQ — Wireless Fluid Fair Queueing
• CIU — Communications Interface Unit
• ASIC — Application Specific Instruction Code
• AMT — Australasian Mobile Telecommunications
• BHP — Burst Header Packet
• M-M — Multiplex-Multicast
• UCS — Unified Communication Service
• SMSL — Standard Multimedia Scripting Language
• DBRN — deciBel Relative to Noise
• MTS — Message Transmission Subsystem
• ONI — Operator Number Identification
• ASP — Active Signaling Protocol
• BFW — Broadband Fixed Wireless
• VRC — Virtual Redundancy Check
• F — Flow
• CIS — Communications and Information Systems
• ECA — Extended Calling Area
• UCS — Universityrsal Multiple-Octet Coded Character Set
• TME — Telocator Message Entry

• CASE — Computer-Assisted Software Engineering
• VM — Voice Messaging
• DS-1C — Digital Signal, Level 1C
• UTP — Universal Transmission Protocol
• TSPS — Traffic Service Position System
• DVC — Digital Video Compression
• TDB — Technology Development Board
• HSCSWD — High-Speed Circuit-SWitched Data
• DTF — Digital Transmission Facility
• WDRM — Wireless Design Reference Manual
• TSAP — Telecommunication Systems Analysis Position
• DCC — Data Communications Channel
• KB — Knowledge-Based
• IPCU — iPhone Configuration Utility
• MMC — Minimum Monthly Charge
• SPNI — Service Provider Network Identifier
• ARQ — Admission Request
• MCPC — Multiple Channels Per Carrier
• WUP — Wired Up Privacy
• DFRI — Datacom Reference Frame Input
• TTIL — Team Telecom International Ltd.
• MC-SS — Multi-Carrier Spread Spectrum
• AI — Airborne Interception
• TIMS — Transmission Impairment Measurement System
• SPU — Service Publication Unit
• IO — Inter-Office
• MIS — Miscellaneous
• HTO — Hellenic Telecommunications Organisation
• WBA — Wireless Broadband Access
• MFJ — Modified Final Judgement
• SMRP — Simple Multicast Routing Protocol
• Q3 — Network Management Interface
• NS — Non-Standard
• ARAI — Adjunct Route Application Interface
• QOSOI — Quality Of Service Over IP (Internet Protocol)
• MES — Master Earth Station
• SSS — Subscriber Switching Subsystem
• SARTS — Switched Access Remote Test System
• GSMA — Global System Mobile Association
• SWAT — Sit, Wait, and Talk
• BEAR — Billed Entity Applicant Reimbursement
• MP — Master Processor
• ITEC — Internet Telecom and Electronic Commerce
• HTU-R — HDSL (High-bit-rate Digital Subscriber Line) Transmission Unit - Remote
• DQDB — Distributed Queue Double Bus
• UPCU — Uplink Power Control Unit
• ECAN — Echo Cancellation
• TBPS — terabit per second
• TSMA — Telecommunications Services Master Agreement
• NSP — National Signaling Point

• SCSA — Standard Consolidated Statistical Area
• PLM — Product Line Manager
• DMP — Decode Media Protocol
• CUG — Closed Users Group
• SRTS — Synchronous Residual Time Stamp
• VPM — Voice Private Message
• MIDP — Mobile Information Device Protocol
• TELECOM — Telecommunications
• IPTD — Internet Protocol Telephony Design
• MRVT — MTP Routing Verification Test
• EC — Echo Cancelling
• SNI — Subscriber-Network Interface
• DM — Design Manager
• IU — Internal Use
• BISDN — Broadband Integrated Services Digital Network
• W-CDMA — Wideband Code-Division Multiple-Access
• MOD — Modulo
• OC-96 — Optical Carrier Signal, Level 96
• TRK — Trunk
• CPS — Carrier Pre-Selection Service
• MCF — Message Confirmation Frame
• MMMS — Mobile Multimedia Messaging Service
• PTN — Portable Telephone Network
• RTZ — Rate for Transmission service for a Zone load
• LMOS — Loop Maintenance Operations System
• OC-3 — Optical Carrier Signal, Level 3
• EVN — Enterprise VoIP (Voice-over-IP) Network
• DCD — Data Carrier Detect
• CLECS — Competitive Local Exchange Carriers
• MMDX — Multi-Media Data Services
• LAC — Line Assignment Center
• SVGA — Super VGA
• HKT — Hong Kong Telecommunications Ltd.
• ACA — Automatic Circuit Assurance
• URC — Utility Reference Customer
• WOS — Wireless Optimization Service
• ESMT — Ecole Superieure Multinationale Des Telecommunications
• SC — Standards Committee
• TXD — Transmit Data
• STE — Syrian Telecommunications Establishment
• MNP — Microcomputer Networking Protocol
• MAPP — Mobile Access Personal Presence
• PWT — Personal Wireless Telecommunication
• CR — Call Reference
• RPV — Resource Property Value
• STV — Subscription Television
• DMB — Disconnect and Make Busy
• SHM — Short-Haul Modem
• HFT — Human Factors in Telecommunications
• RTAP — Real-Time Application Platform

• ACL — Average Call Length
• MMS — Multimedia Message Service
• PTK — Post and Telecom of Kosovo
• TTGS — Test Tone Generator Software
• TPB — Talking Phone Book
• CK — Check Bit
• AC — Always Connected
• FCCSET — Federal Coordinating Committee for Science, Engineering and Technology
• DUC — Designated Underlying Carrier
• STE — Software Test Environment
• VOI — Voice Over Internet
• SHN — Self-Healing Network
• CPT — Cellular Paging Teleservice
• IMTC — International Multimedia Telecommunication Consortium
• EOT — Eastern Oregon Telecom
• DCP — Distributed Collaborative Planning
• MAHO — Mobile Assisted Handoff
• ACOU — Additional Call Offering Unrestricted
• WAPF — Wireless Application Protocol Forum
• WTDM — Wideband Time Division Multiplexing
• LET — Line Equipment Transfer
• RFS — Resource Facing Service
• WAR — Wireless Access Revolution
• ESSE — Embedded Systems Software Environment
• WDA — Wireless Developer Agency
• WCRL — Wireless Communications Research Laboratory
• CCIR — Comittee Consultatif International Radiotelecommunique
• ACVS — Ameritech Customized Video Service
• DMTF — Desktop Management Task Force
• UMTS — Universal Mobile Telecommunication Services
• DSP — Data Service Provider
• ECMA — European Community Manufacturers Association
• UIH — Unnumbered Information with Header check
• HSUPA — High-Speed Uplink Packet Access
• TRAN — Transient
• MIC — Management Integration Consortium
• CMT — Commercial Metering Transponder
• PDE — Positioning Determination Entity
• IOCA — Interception of Communications Act
• ISC — International Switching Center
• LME — Line Monitoring Equipment
• DLC — Digital Leased Circuit
• GTB — Global Telecoms Business
• LSAP — Link Layer Service Access Point
• HIP — Holes In Phonebooks
• CCTA — Cctacentral Computer And Telecommunications Agency
• COB — Change Of Billing
• CSP — Converged Service Platform
• ISSIP — Inter-Switching System Interface Protocol
• ACE — Authentication Encryption

• TEM — Telecommunications Expense Management
• CTS — Call Tracking System
• UIT — Union Internationale des Telecommunications
• IVW — InfoView Wireless
• SLC — Service Level Contract
• LAPM — Link Access Protocol for Modems
• TP — Transaction Processor
• UCD — Uniform Call Distributor
• DS-2 — Digital Stream 2 (6.312 mbps)
• WSF — Workstation Function
• RSU — Remote Switching Unit
• TSD — Type Specific Driver
• WACN — Wide Area Communications Network
• VOF — Voice Over Fiber
• XDSL — "generic" Digital Subscriber Line
• TU — Total Usage
• RCMS — Recharge Card Management System
• VRT — Voltage Reduction Technology
• ML — maximum length
• PR — Preference
• CPC — Crosstalk Prevention Coding
• TIMS — Transmission Impairment Measuring Set
• WAVE — Wide Area Voice Exchange
• TAP — Test Access Path
• AC — Absorption Coefficient
• CFS — Customer Facing Services
• WTN — Working Telephone Number
• SLM — Subscriber Loop Multiplex
• PRCS — Philips Radio Communications Systems
• LCA — Line Circuit Address
• AA — Agile Access
• SGW — Server GateWay
• WNAS — Wireless Network Access Services
• TSGR — Transport System Generic Requirements
• CSP — Continuous Speech Processing
• MID — Maritime Identification Digits
• IDC — Information Distribution Company
• NATA — North American Telecommunications Allocation
• SS5 — Signalling System 5 (2400/2600 Hz tones)
• FICORA — Finnish Communications Regulatory Authority
• CVSD — Continuous Variable Slope Detection
• TSS — Telecommunication Standards Sector
• WTA — Wireless Telephony Application
• CIL — Call Identification Line
• TAE — Terminal Adapter Equipment
• DVI — Digital Video Interleaved
• ABTA — Associação Brasileira de Telecomunicações por Assinatura
• WIG — Wireless Internet Gateway
• WPOP — Wireless Point-of-Presence
• STDM — Statistical Time Division Multiplexer

• VTAC — Vermont Telecom Advancement Center
• MDTS — Mobile Data Terminal Software
• CARS — Cable Antenna Relay Services
• WTNG — World Telephone Numbering Guide
• H11 — High-capacity ISDN channel operating at 1.536 Mbps
• WIWT — Wireless Internet of West Tennessee
• SQE — Signal Quality Error
• DS-4 — Digital Stream 4 (274.016 mbps)
• IOCDS — Input/Output Configuration Data Set
• C-M — Control-Monitor
• FECC — Federal Emergency Communications Coordinator
• ADTS-E — Ameritech Digital Transport Service - Enhanced
• MFA — Multi-Frame Alignment
• RCDD — Registered Communications Distribution Designer
• ITU-TSS — International Telecommunications Union - Telecommunications Standardization Sector
• UPR — User Performance Requirement
• SPCS — Stored Program Control System
• FCO — Foreign Central Office
• IOPS — Internet Operators Providers Services
• URR — UHF (Ultra-High Frequency) Radio Receiver
• SUBT — Subscriber Terminal
• BTL — Bell Telephone Laboratories, Inc.
• AIOD — Automatic Identification of Outward Dialing
• CDB — Configuration Data Base
• ETT — Emona Telecoms Trainer
• ECR — Enhanced Call Routing
• UDLC — Universal Digital Loop Carrier
• TAAC — Telecommunications Access Advisory Committee
• PPT — Permanent Part Time
• SLTS — Sri Lanka Telecom Services
• GTXC — Global Telephone Exchange Carrier
• SQR — Signal to Quantizing noise Ratio
• ROPP — Receiver Only Packet Pair
• SWN — Statewide Wireless Network
• ISDT — Integrated Services Digital Terminal
• SMG — Super Master Group
• NACSIM — National Communications Security Information Memorandum
• SLICE — Selective Line Insertion Communication Equipment
• HCDS — High Capacity Digital Services
• LAP-D — Link Access Procedure- Digital channel
• OCTS — Ocean Color and Temperature Scanner
• WNSK — Wireless Networking Starter Kit
• LQO — Line Quality Operation
• BASH — Bandwidth Sharing
• XNS — Xerox Network System
• LPU — Line Protection Unit
• WIPI — Wireless Internet Platform for Interoperability
• STDM — Statistical Time Division Multiplexing
• ITSP — Internet Telephone Service Provider
• ATR — Advanced Telecommunications Research Institute

• WECA — Wireless Ethernet Compatibility Alliance
• UBL — Universal Bluetooth Link
• ETET — Electrical and Telecommunications Engineering Technology
• STP — Shielded Twisted-Pair
• OTH-B — Over-the-Horizon Backscatter
• CCO — Component Coordinator
• WICS — Wireless Integrated Communication System
• USI — User System Interface
• SGS — Software Generation System
• MAC — Message Authenticity Check
• CNAD — Calling Name Delivery
• STEREO — Solar Terrestrial Relations Observatory
• IRB — Instruction Reorder Buffer
• CASP — Communications Application Service Provider
• QLC — Quality Com
• DX — Duplex Signaling
• QSK — Quadrature Shift Keying
• RXD — Receive Data
• FEFA — Far End Failure
• VRS — Video Relay Service
• DQR — Directory enQuiry Restricted
• TBRL — Terminal Balance Return Loss
• RPE-LPC — Regular Pulse Excited - Linear Predictive Coder
• MOE — Modem Operating Environment
• APR — Alarm Processing Remote
• SVC — Single Voice Coil
• DUNCE — Dial-Up Networking Connection Enhancement
• ITSO — International Telecommunications Satellite Organization
• BSVCI — Broadcast Signaling Virtual Channel Identifier
• EV-DV — EVolution Data/Voice
• WIPA — Walkup Internet Port Authentication
• SIU — Subscriber Interface Unit
• WNVA — wireless Network Vicinity Assessment
• PPCH — Packet Paging Channel
• MERS — Most Economical Route Selection
• WNC — Wireless Network Communications
• BTMS — BITEK Telecommunications Management System
• AWCC — Afghan Wireless Communications Company
• D — Diagonal
• ILETS — Idaho Law Enforcement Telecommunication System
• CAIRO — Communications Audio Interface for Remote Operations
• UPC — Universal Personal Communication
• VRSP — Voltage, Ringing Signal Positive
• STS — Synchronous Transfer Signal
• BT — Busy Tone
• PTAM — Professional Telephone Answering Machine
• NATS — North American Terrestrial System
• RDI-V — Remote Defect Indicator - Virtual
• TSM — Transaction State Machine
• IN7 — Compaq SS7 stack

• ACR — Anonymous Call Rejection
• CW — Call Waiting Supplementary Service
• LMS — Local Measured Service
• RFA — Recurrent Fault Analysis
• MSID — Mobile Station Identity
• PCMCIA — Personal Computer Memory Card Industry Association
• LOSW — Loss Of Synchronous Word
• CUSA — Central Urban Service Area
• YBY — Why Be Yellow
• TBI — Telecom Brokerage Inc
• OMNCS — Office of the Manager, National Communications System
• PTFP — Public Telecommunications Facilities Program
• TIF — Telecommunications Infrastructure Fund
• UMS — Unified Messaging Service
• MJU — Modular Jack Unit
• CDRM — Cross-Domain Resource Manager
• VTE — Virtual Test Environment
• SRVT — SCCP Routing Verification Test
• IS-41 — TIA/EIA Interim Standard for mobile management
• L4 — Layer 4
• TTK — Telephone Travel Kit
• WITS — Web Interface for Telescience
• ROH — Receiver Off-Hook
• CTSO — Cellular Telephone Service Order
• CID — Cell IDentification number
• CTE — Computer Telephony Engine
• ALC — Automatic Line Controller
• GSN — GPRS (General Packet Radio Service) Support Node
• BBCR — BroadBand Communications Research
• BIT — Bureau of Information and Telecommunications
• AC — Authorization Center
• BWRC — Berkeley Wireless Research Center
• BS — Busy Season
• WCB — Wireline Competition Bureau (FCC)
• DWB — Designer's Workbench
• RCV — ReCharge Voucher
• ITU-T — International Telecommunication Union-Telecommunications
• CNT — Corporacion Nacional de Telecomunicaciones
• GEO — Geostationary-Earth-Orbit
• TWC — The Weather Channel(r)
• TOT — Time Of Transmission
• IVI — Intel Video Interactive
• BANC — Broadband Access Network Coordination
• NSM — Network Status Monitor
• AUBW — AutoBot Walkthrough
• CQ — Communications Quality
• GATE — GPRS (General Packet Radio Service) Application Test Environment
• IQ — In-phase and Quadrature
• MSSC — Mobile Satellite Switching Centre
• YLT — Your Local Telecom

• C — Clock
• CPS — Customer Premises System (Bellcore)
• NSK — Nonstop Kernel
• WIX — Wireless Information EXchange
• C/R — Control/Response indication bit
• WFM — Wireless Frequency Modulation
• DF — Distributing Frame
• DLOL — Digital Loss Of Link
• MEAS — Measurement Specialties, Inc.
• BNT — Broadband Networking Technology
• TCCMS — Telecom Consumer Complaints Monitoring System (India)
• O — Optical
• OE — Originating Equipment
• DEN — Directory Enabled Networks
• IPC — Initial Paging Channel
• D/U — Delay Unit
• OTF — Optical Transfer Function
• POR — Power On Reset
• WWA — Wireless Web Application
• ITV — Instructional Telecommunications And Video
• QIC — Quality Improvement Council
• DODD — Department Of Defense Directive
• SCAT — Single Channel Autonomous Trunking
• DAMPS — Digital Advanced Mobile Phone System
• OOR — Operator Override
• ECSA — Exchange Carrier Standards Association
• AT — Access Terminal
• ESG — Error Satellite Gauge
• DNR — Dial Number Recorder
• WTIA — Wireless Technology Industry Association
• TEO — Telephone Equipment Order
• PSX — Power System Exchange
• WTPF 3 — World Telecommunication Policy Forum 3
• JTU — Japan Telephone Upgrade
• WITS — Washington Interagency Telecommunications System
• WTDC 2003 — World Telecom Development Conference 2003
• ESP — Essential Service Protection
• CICT — Commission on Information and Communications Technology
• HOMEPNA — Home Phoneline Networking Alliance [also HomePNA2]
• DPCM — Differential Pulse Code Modulator
• DS-1C — Digital Stream 1C (3.152 mbps)
• STE — Signaling Terminal Equipment
• TMT — Technology, Media, and Telecommunications
• TOM — Telecom Operations Map
• VSM — Voice Service Module
• CTIE — Centre for Telecommunications and Information Engineering (Monash University; Australia)
• HSC — High Speed Connect
• L — Lambert
• T3 — Transmission service at the DS3 rate of 44.736 Mbps
• CTN — Corporate Telecommunication Networks

• OC-192 — Optical Carrier Signal, Level 192
• SSP — Service Switching Point
• ECITTC — European Committee for Information Technology Testing and Certification
• OM — operations management
• MM — mismatch
• APTC — Atlantic Provinces Telecommunications Council
• EFRC — Enhanced Full Rate Codec
• DCH — Discrete CHannel
• WMA — Wireless Messaging API (Application Programming Interface)
• VF0 — Voice Fundamental Frequency
• DDCZ — Daily Demand Charge for a Zone
• PCTF — Per-Call Test Failure
• ONE — Other Network Entity
• SLS — Sidelobe Suppression
• BUC — Block Up-Converter
• DMPB — Digital Multi-Point Bridging
• FELB — Far-End Loop Back
• E&M — Earth and Magneto (signaling leads)
• CCS — Centa- (hundred) Call Seconds
• WID — Wireless Information Device
• LOP-V — Loss Of Pointer - Virtual
• CSUR — Conscript Unicode Registry
• LLI — Logical Link Identifier
• TEDP — Telecommunication Equipment Distribution Program
• TSAU — Time Slot Access Unit
• TSG — Test Signal Generator
• MEOS — Medium Earth Orbit Satellite
• IOS — Internet Over Satellite
• A — All lines
• IWU — Interworking Unit
• CLS — Current Level of Service
• UTL — United Telecom Limited
• LADT — Local Area Data Transport
• IMT — International Mobile Telecommunications
• PTCM — Pragmatic Trellis-Coded Modulation
• WDF — Wireless Data Forum
• NBS — New British Standard
• HTU-C — HDSL (High-bit-rate Digital Subscriber Line) Transmission Unit - Central office
• ELL — Ethernet Leased Line
• VMB — Voice Mail Box
• WORP — Wireless Outdoor Router Protocol
• WVI — Wireless Vehicle Interface
• MFAS — Multi-Frame Alignment Signal
• KSR — Key Send Receive
• ITTP — Information Technology And Telecommunications Policy
• LWT — Listen While Talk
• RTNR — Real-Time Network Routing
• SSCOP — Service Specific Connection Oriented Protocol (ATM)
• DCCH — Digital Control Channel
• SIT — Special Information Tone

• BRQ — Bandwidth Request
• CO — Central Operations
• DTF — Dial Tone First
• LTP — Long Term Prediction
• CL — cell loss
• ASE — Accredited Systems Engineer
• DDCNZ — Daily Demand Charge for Non-Zone Network Load
• BRTL — Blu-Ray Triple Layer
• MGW — Mobile GateWay
• RRJ — Registration Reject
• THL — Trans-Hybrid Loss
• ECP — Exchange Control Panel
• WDCS — Wireless Distributed Communication System
• HDT — Host Digital Terminal
• WUA — Wireless USB (Universal Serial Bus) Adapter
• SPA — Service Planning Area
• CMRS — Commercial Mobile Radio Services
• BCM — Bit Compression Multiplexer
• EOC — Embedded Operations Channel
• CDF — Communications Data Field
• ILRM — Interim Local Management Interface
• DCA — Distributed Communications Architecture
• WTDC 2002 — World Telecom Development Conference 2002
• KTA — Kentucky Telecom Association
• ETC — Enhanced Telecommunications Corporation
• IESS — INTELSAT Earth Station Standard
• RATS — Richmond Amateur Telecommunications Society
• IWE — Institute for Wireless Education
• ISD — Instructional Systems Designers
• DLI — Dialed Line Identification
• TTTN — Tandem Tie Trunk Network
• PN — Public Network
• AAC — Alternate Area Code
• HCT — Hierarchical Cellular Tree
• EMLPP — Enhanced Multi-Level Precedence and Priority
• WTRS — Wisconsin Telecommunication Relay System
• RSI — Record Status Indicator
• MDU — Monthly Domestic Usage
• COIC — Central Office Interface Circuit
• SKT — Sun Kyung Telecom
• WWTW — World Wide Telecom Web
• IDM — Interim Data Modem
• TNS — Time to Next Send
• ACG — Automatic Code Gapping
• GT&T — Guyana Telephone and Telegraph Company
• CT — Control terminal
• TELCO — Telecommunication Network for Cooperative Driving
• CSF — Common Service Framework
• SS3 — Signalling System 3 (2280 Hz tone)
• CGT — Consultants Group for Telecommunications

• OC-12 — Optical Carrier Signal, Level 12
• DHA — Dialogue Handling
• WNT — Windows NT
• CCSD — Cellular Circuit Switched Data
• RLF — Remote Line Failure
• NSSG — Network Solutions and Service Group
• ASC — Available Spare Capacity
• MAP — Mobile Applications Port
• SWF — SWitched Fractional
• TED — Triteal Enterprise Desktop
• TWSS — Telecom Web Services Server
• IWCS — Integrated Wideband Communications System
• COMS — Cambridge Open Mobile System
• CDO — Community Dial Office
• SUF — Service Update Facility
• MDCNZ — Monthly Demand Charge for Non-Zone network Load
• DS-1 — Digital Stream 1 (1.544 mbps)
• SCM — Service Class Mark
• T3 — 44.736 Mbits per Second line
• LQN — Line Quality Network
• WRU — Wireless Receiver Unit
• FERF — Far-End Receive Failure
• PTO — Public Telephone Operator
• T1 — Transmission service at the DS1 rate of 1.544 Mbps
• UMATS — University of Maryland Academic Telecommunication System
• SINAP — Signalling and Intelligent Network Applications Platform
• ERMES — European Radio Message System
• SRU — Single Receiver Unit
• LETS — Line Efficiency Tracking System
• TSIP — Telecommunications System Installation Plan
• ALIT — Automatic Line Insulation Test
• SDK — Service Development Kit
• TAMS — Telecom Analysis and Management System
• MEO — Middle-Earth-Orbit
• VVD — Voice and Video Data
• AGRAS — Air-Ground Radiotelephone Automated Service
• B911 — Basic 911 Emergency Service
• ENST — Ecole Nationale Supérieure des Télécommunications
• SLC — Subscriber Loop Carrier
• URM — Uniform Redial Model
• ITU-R — International Telecommunication Union-Radiocommunications
• WLS — Wireless Location Services
• TVR — Telephone Voice Response
• WIAS — Wholesale Internet Access Services
• DMB — Digital Multimedia Broadcasting
• GLD — German Long Distance
• AA — Audit Agent
• ADLI — Automatic Dial Line Identification
• LAP — Link Access Protocol
• MJT — Modular Jack Terminal

• T — Tip
• FFM — First Failure to Match
• SCRB — SBC (Single Board Computer) Control and Reset Box
• MBCM — Multiple Block-Coded Modulation
• NTON — National Transparent Optical Network
• NCP — Network Control Point
• HTU — HDSL (High-bit-rate Digital Subscriber Line) Transmission Unit
• RFI — Remote File Inquiry
• LSOA — Local Service Order Administration
• WAP — Web Access Phone
• PICS — Protocol Implementation Conformance Statement
• ESMR — Enhanced Specialized Mobile Radiotelephony
• BASH-R — BAndwidth SHaring with Resource constraints
• ITTC — Information and Telecommunication Technology Center
• MTS — message transport system
• WCS — Wireless Communications Service
• UBI — Usage Billing Information
• SEE — Software Engineering Environments
• IDDD — International Direct Distance Dialing
• LLAR — Local Loop Access Ring
• WTB — Wanted to buy
• DCN — Disconnected and Changed Numbers
• AA — Automatic Answer
• TANE — Telephone Association of New England
• NOLM — Nonlinear Optical Loop Mirror
• RTP — Research Triangle Park
• EVRC — Enhanced Variable Rate CODEC (CODer-DECoder)
• DSRF — Device Savings Recovery Fee
• ATLAS — Accessing Telecoms Links Across Scotland
• ISD — Independent Segment Decoding
• SPN — Service Panel Number
• WHAT — Wireless Hybrid Asynchronous Time-bounded
• APOT — Access Point Of Termination
• RI — Ring In
• WL — Wire Line
• CBS — Common Battery Signaling
• WSNN — Wireless Sensor Network News
• VSR — Viking Single-line loud Ringer
• CTNS — Certified Telecommunications Network Specialist
• SDB — Switched Digital Broadcast
• INSAT — India's Indian National Satellite
• JTRS — Joint Tactical Radio Systems
• MEAS — Measured Extended Area Service
• X25 — A Packet Switching Protocol
• LDC — Long Distance Carrier
• MED — Manipulative Electronic Deception
• DNI — Did Not Include
• MM — Multimode (fiber optic cable)
• NEBS — New Equipment Building Specifications
• GSA — Guarded Single Assignment

• SWANSAT — Super-Wide Area Network SATellite
• VFM — Voice Frequency Measurement
• IRTC — Illinois Rural TeleCommunication
• TIBS — Tactical Information Broadcast Service
• MFN — Multiple Frequency Network
• WDP — Wireless Data Pool
• AS56 — Access System Centum 56 series
• WISI — Wireless Integrated Strike Interface
• INPT — Institut National des Postes et Télécommunications
• IVAD — Integrated Voice and Data
• TCCL — Terminating Carrier Command Line
• RAPID — Remote Access Protocol Interface Device
• AMP — amplifier / amplification
• JICC — Justice International Calling Card
• LAP-D — Link Access Protocol-D channel
• FSM — Field Service Manager
• IMMAT — Instituto Municipal Malvinas Argentinas Telecomunicaciones
• RAMA — Resource Auction Multiple Access
• CMI — Computer Managed Instituteuction
• ECTEL — Eastern Caribbean TELecommunications Authority
• CNA — Certified Novell Administrator
• WIDS — Wireless Intrusion Detection Sensor
• RU — Remote Unit
• AIOD — Automatic Identification of Outward Dialed calls
• WTK — Wireless Toolkit
• MNET — Minnesota's Network for Enterprise Telecommunications
• CEPT — Committee of European Postal & Telephone (authorities)
• TAPS — TELEPHONE APPLICATION PROCESSING SYSTEM
• WND — Wireless Network Design
• DI — Document Index
• AM — Advance Mobile
• SQM — Signal Quality Manager
• DMF — Distributed Messaging Fabric
• SDN — Software-Defined Network
• TOH — Transport Overhead
• EICS — EURESCOM Information and Communications Services
• ESL — Educational Sales Ledger
• UNL — Unlisted
• ROF — Reformat on the Fly
• TEM — Telecom Expense Management
• VNT — Very Nice Telephone
• RNW — Radio NetWork
• TLX — TELEX (TELegraph EXchange)
• WTR — Wireless Token Ring
• NTSA — Networking Technical Support Alliance
• GTTI — Global Telecommunication Training Institute
• ATM — Automated Transmissions Machine
• DTIS — Department of Telecommunications and Information Services
• DSP — Domain Specific Part
• WIPN — Wireless Internet Protocol Network

• TSSI — Telecom Switched Services Interoperability
• LDL — Long Distance Link
• NETS — Nationwide Emergency Telecommunications Service
• DP — Drop Point
• RACE — Research for Advanced Communications in Europe
• DLIS — Directory Listing Inquiry System
• LAPD — Link Access Procedure D channel
• DSVT — Digital, Secure Voice Telephone
• MVPRP — Multivendor Problem Resolution Process
• SRS — Supported Residential Services
• ACS — Accelerated Change Service
• CMS — Circuit Multiplication System
• TRNA — Temporarily Restricted Net Asset
• WTRP — Wireless Token Ring Protocol
• LMC — Loop Maintenance Center
• RATS — Radio-Amateur Telecommunications Society
• FO — Fiber-Optic
• QNS — Questar Network Services
• SCS — Signal Collection System
• CHE — Central Head-End
• TMOD — Telecommunications and Mission Operations Directorate
• CMP — Connection Management Procedures
• WWOM — Wireless Work Order Management
• CD — Carrier Detect
• PIN — Positive-Intrinsic-Negative
• IUC — Interconnect Usage Charge
• DVCC — Digital Verification Color Code
• WDL — Wireless Device License
• WTNP — Wireless Telephone Number Portability
• M — Maintenance (Job Status)
• SM-SC — Short Message Service Center
• ANCD — Automatic Network Call Distrubution
• SCC — System Control Center
• IMS — IP (Internet Protocol) Multimedia Subsystem
• TMN — Telecommunications Management Network
• SYNC — Synchronous
• SYNTRAN — Synchronous Transmission
• JIS — Jurisdictional Interstate Service
• TESP — Telecommunications Enterprise Strategic Program
• CN — Calling Number
• MBA — Masters in Business Administration
• DIAG — Diagnostics
• WWVC — WorldWide VideoConferencing
• VRSM — Voltage, Ringing Signal Modified (inverted)
• WIT — Wireless Image Transfer
• IMN — Intelligent Mobile Network
• WDDM — Wavelength-Division Demultiplexing
• MUF — Maximum Useable Frequency
• ITF — Information Transport Function
• RDI-P — Remote Defect Indicator - Path

• TR — Temporal Reference
• HIC — Head-End Interface Converter
• ESVN — Executive Secure Voice Network
• VCE — Voice Clarity Enhancement
• UBT — Universal Backend Tester
• VRSP — Video Relay Service Provider
• TSAPI — Telephony Services Application Programming Interface
• SNA — Systems Network Architecture
• THT — Total Handling Time
• FUNI — Frame (relay) User Network Interface
• CTN — Community Telecommunications Network
• RWF — Roaming Wireless Framework
• RIC — Radiocommunications Information Circular
• WNA — Wireless Network Adapter
• LCN — Local Channel Number
• WLRL — Wireless LAN (Local Area Network) Research Laboratory
• KLM — Keyboard Layout Management
• EDGE — Enhanced Data for GSM Evolution
• BETAG — Beginning-End Tag
• UGC — UnderGround Communications
• OTA — Over-the-Air Activation
• COSMIC — common systems main interconnecting
• DSS — Digital Switching Subsystem
• ANP — Autonomous Network Planning
• DNMS — Dual Network Media Server
• ISC — Information Systems Council
• CSA — Central Service Area
• HOPA — Higher-Order Path Adaptation
• ZUD — Zero Unscheduled Downtime
• OC — Output Controller
• TMAP — Technical Management Assistance Programme
• NIMA — National Imagery Mapping Agency
• WACM — Wide Area Communications Management
• PNA — Parallel Network Architecture
• WRAN — Wireless Rural Area Network
• CSI — Clearing Subnetwork Identification
• CS — Connection Segment
• SM — Statistical Multiplexing
• WWAT — Wireless Wide Area Telemetry
• TLS — Telephone Line Simulator
• LL — Lower Layer
• WCPE — Wireless Customer Premises Equipment
• WXE — Wireless Exchange Engine
• SPH — Samsung PHone
• CFU — Call Forward Unconditionally
• TVL — TELECOM VANUATU LIMITED
• DSX-2 — Digital Stream Crossconnect 2 (6.312 Mbps)
• BC — Committed Burst Size
• LEO — Low-Earth-Orbit
• SU — super-user

• WQOS — Wireless Quality of Service
• SLTE — Signaling Link Termination Equipment
• VOIPTXT — Voice over Internet Protocol Text
• TVL — Telecoms Virtual Library
• SATRA — A Saudi Arabian Telecommunications Regulatory Authority
• WISE — Wireless Infrastructure Simulation Environment
• NCOSE — National Council on Systems Engineering
• WTCP — Wireless Transport Control Protocol
• IR — Information Rate
• UMTS — Universal Mobile Telecom Surfwax
• ATSC — Australian Telecommunications Standardization Committee
• TE — Thermoelectric
• WCTG — Wireless Communications Technologies Group
• TINA — Telecommunications Information Networking Architecture
• ILQ — Inbound Link Quality
• WUF — Wireless University Forum
• OC-24 — Optical Carrier Signal, Level 24
• PCL — Product Computing Module Load(s)
• ICR — Intelligent Call Routing
• DSS — Digital Subscriber Signalling
• ITS — Institute for Telecommunication Sciences
• FCOT — Fiber Central Office Terminal
• AOS — Alternative Operator Services
• BIPT — Belgian Institute for Post and Telecommunications
• IA5 — International Alpha Set No. 5
• UNICODE — UNIversal trunk - out-of-service CODE
• IS — Integrated Services
• HPNA — Home Phoneline Network Adapter
• VAC — Voice Activity Compression
• THAAD — Theater High Altitude Area Defense
• DCPZ — Daily withdrawal coincident with Customer Peak for a Zone
• WSI — Wireless Services Integration
• CERN — Centre Europйen de Recherche Nuclйaire
• BLERT — Block Error Rate Test
• ZPD — Zero-Plus Dialing
• ISM — Instrumentation Scientific and Medical
• CRACK — Challenge Response for Authenticated Crypto Keys
• TSB — Telecommunications Systems Bulletin
• VIDF — Vertical Intermediate Distributing Frame
• WBT — Wireless Business Technology
• DLS — Dual Line Signalling
• TDP — Tag Distribution Protocol
• CTUF — Cape Telecommunications Users Forum
• IVDT — Integrated Voice/Data Terminal
• HSOPA — High-Speed OFDM (Orthogonal Frequency Division Multiplexing) Packet Access
• ADU — Accumulation and Distribution Unit
• E-911 — Enhanced emergency telephone number
• VCC — VSAT (Very-Small-Aperture Terminal) Control Center
• CASE — Common Application Service Elements
• WBE — Wireless Business Engine

• UCP — Universal Communications Platform
• LQE — Line Quality Engineering
• NAB — National Association Of Broadcasters
• RAST — Receive and Send Terminal
• IVD — Integrated Voice and Data
• WHM — Wireless Host Module
• GTSS — Global Telecom Solutions Sector
• MPPP — Multilink Point-to-Point Protocol
• SWAN — Structured Wireless Aware Network
• WIOP — Wireless Inter-ORB (Object Request Broker) Protocol
• PSU — Packet Switching Unit
• WACS — Wireless Access Communications System
• CPP — Calling Party Pays
• UI — Unnumbered Information (frame)
• WIAD — Wireless Integrated Access Device
• OTM — Object Transaction Manager
• WTPF — World Telecommunication Policy Forum
• CS — Clear to Send
• ADTN — Agency Data Telecommunications Network
• VQR — Voice Quality Rating
• RASC — Radio Access System Controller
• EPI — External Provisioning Interface
• WNM — Wireless Network Management
• TLC — Text Link Cellular
• WMTS — Wireless Medical Telemetry Service
• AZDL — Adjusted Zonal Daily Load
• SMDF — Subscriber Maintenance Distributing Frame
• FCA — Fixed Channel Assignment
• EMX — Earth and Magneto Signaling
• RBES — Rule-Based Expert Systems
• NB — Narrowband
• WTF — Wireless Telecommunications Facility
• IDR — Installer Design Required
• HFK — Hands Free Kit
• ESFDL — Extended Super Frame Data-Link
• QCIF — Quarter Common Image Format
• CMP — Communications Module Processor
• APS — Affordable Portable Services
• WACP — Wide Area Calling Plan
• CI — Customer Installation
• RWN — Regional Wireless Networks
• VMIC — VME Microsystems International Corporation
• BT — Bluetooth Two
• RI — Ring Interface
• VON — Voice Over Network
• WRRK — Wireless Router and Repeater Kit
• ICAL — Interexchange Carrier Access Line
• OC-36 — Optical Carrier Signal, Level 36
• WNQS — Wireless Network Quality Specification
• WN — Wireless Network

• BLT — Bottom Line Telecommunications
• SCC — Signal Conversion Circuit
• TPE — Telephony Platform Engine
• RTSE — Remote Transfer Service Element
• CMM — Calls, Minimums, Maximums
• ASR — Automatic Set Relocation
• CBO — Call-Back Only
• ICS — Intelligent Calling System ID Identification
• CNA — Called Number Authority
• DV — Data and Voice
• WIXD — Wireless Internet eXpress Data Connection
• BLERT — BLock Error Rate Tester
• ENFIA — Exchange Network Facilities for Interstate Access
• WECM — WebSphere Everyplace Connection Manager
• IAST — Industry Access Service Tariff
• TDR — Transaction Data Reports
• FOTP — Fiber Optic Test Procedures
• TTE — Telecommunications Terminal Equipment
• DPO — Dial Pulse Originate
• WLAB — Wireless LAN (Local Area Network) Access Bridge
• ADU — Analog-to-Digital Unit
• CEP — Communication End Point
• SPC — Service Provider Code
• GETS — The Government Emergency Telecommunications Service
• VDS — Variable Department Sonar
• RLCI — Receive Line Clock Input
• CFA — Carrier Failure Alarm
• ITW — International Telecoms Week
• SRB — Software Release Bulletin
• SSS — System/segment Specification
• KEY — Keyset (multiline phone)
• LDDS — Limited Distance Data Service
• MJC — Modular Jack Cable
• TELEX — Teleprinter Exchange
• VCA — Voice Communications Adapter
• BAC — Bar Calls
• FWT — Fixed Wireless Terminal
• RRO — Regulated Rate Option
• OHD — Optical Heterodyne Detection
• WPA — WiFi Protected Access
• ECS — Emergency Communication System
• DLC — Digital Line Controller
• WNRC — Wireless Networks Research Center
• OMP — Operations and Management Platform
• LQI — Line Quality Indicator
• RALB — Resource All Busy
• BR — Basic Rate
• MMT — Multimedia Multiparty Teleconferencing
• DCAT — DSL (Digital Subscriber Line) Customer Advocacy Team
• DT — Dial Tone

• VRR — Videoconferencing Reservation Request
• TCM — Tandem Connection Maintenance
• TL1 — Transaction Language One
• PVRA — Physical Volume Reserved Area
• LVC — Label Virtual Circuit
• ULSI — Ultra Large-scale Integration
• ISUP — ISDN Service User Part
• UTRA — Universal Terrestrial Radio Access
• TISM — Telecommunication, Information Studies and Media
• MLC — Multiple Level Cell
• ZDL — Zonal Daily Load
• UMC — Ukrainian Mobile Communications
• WACR — Wide Area Call Reception
• PNVS — Pilot Night Vision Sensor
• AC — Armored Cable (electricity)
• VMLA — Virtual Mobile Location Area
• WLS — Wait Listing Service
• TOSL — Telecommunications Ombudsman Service Limited
• CPEB — Channel Partner Enablement Briefing
• TELCO — Telecommunications Company
• UG — User's Group
• LOP-L — Loss Of Pointer - Line
• MOM — Mainboard Operation Monitor
• RLDI — Receive Line Data Input
• AHT — Average Holding Time
• CSS — Customer Service System
• VSP — VoIP Service Partner
• TTAC — Telecommunication Technology Advisory Committee
• HIDF — Horizontal Intermediate Distributing Frame
• ATZ — Attention: Reset modem
• COCOT — Customer Owned Coin Operated Telephone
• MBA — Message Body Authenticator
• PIC — Pre-Subscribed Interexchange Carrier
• PRAM — Parameter RAM
• MDC — Monthly Demand Charge
• DAP — Demand Access Protocol
• CWC — Center Weight Control
• FCAPS — Fault, Configuration, Accounts, Performance, Security
• NCA — Non-Call Associated
• TXE — Transmitter Empty
• WEPD — Weighted Early Packet Discard
• TLWS — Trunk and Line Work Station
• TTX — TeleTeXt
• UARS — Upper Atmospheric Research Satellite
• AIP — Administrative Installation Point
• TSP — Telecom Service Provider
• MDCZ — Monthly Demand Charge for a Zone
• DP — Dial Pulsing
• WMTP — Wireless Messaging Transfer Protocol
• PAD — Packet Assembler-Disassemble

• T2R — Trusted Transaction Roaming
• UNS — Universal Numbering System
• DCU — Drum Control Unit
• BEP — Back-End Processor
• WNL — Wireless Networks Laboratory
• DF — Data Frame
• ECG — English Cell Group
• CCF — Custom Calling Feature
• CDR — Common Data Rate
• MFR — Multi-link Frame Relay
• CS — Communications Satellite
• VQC — Vector Quantizing Code
• FSS — Fixed Satellite System
• RHE — Regional Head-End
• WON — Wireless Optical Network
• LAS — Local Authentication Service
• SHOE — Simple Hypertext Ontology Extensions
• MMF — Microsoft Mail File
• EQ — Equal To
• DSX-3 — Digital Stream Crossconnect 3 (44.736 Mbps)
• TSY — Telephony Server
• VPLS — Virtual Private LAN (Local Area Network) Service
• WDCX — Wideband Digital Cross-connect
• RWI — Real Wireless Intelligence
• DPE — Dollar Phone Enterprise
• TSA — Terminating Switched Access
• UL — Upper Layer
• THP — Terminal Handler Process
• SILO — Signal Intercept from Low Orbit
• WUPE — Wireless User Premises Equipment
• RUIM — Removable User Identification Module
• MIS — Mobile Information Service
• GAT — GSM, AMPS, and TDMA
• VT — Virtual Tributary signal
• GWCS — General Wireless Communications Service (46560 - 4685 MHz)
• RPE-LTP — Regular Pulse Excited - Long Term Prediction
• BSM — Broadband Satellite Multimedia
• USITA — United States Independent Telephone Association
• WWJ — Wireless Watch Japan (est. 2001)
• SS7 — Signalling System 7
• BT — British Telecom…
• KTL — Killarney Telecommunications Ltd
• RITS — Residential Information Technology Services
• BDS — Bundled Digital Services
• VTPM — Virtual Terminal Protocol Machine
• H0 — High-capacity ISDN channel operating at 384 kbps
• SSS — Switching Subsystem
• CHM — Changeover and Changeback Messages
• RTDC — Regional Telecommunication Development Conference
• HCF — High Connection Failure

• PAL — Phase Alternating by Line
• MCFI — Multiple number Call Forwarding Inhibit
• WNIU — Wireless Network Interface Unit
• USPRO — United States Product Data Association
• FFC — Front-Facing Camera
• VMB — Voice Message Broadcasting
• ACIS — Andy Charles Ians System solid modelling geometric engine
• PTC — Pots Tandem Centrex
• WTID — World TELECOM Internet Day
• SLIM — Service Level Improvement Method
• MND — Multi-Number Dialer
• WBBI — Wireless BroadBand Internet
• PTP — Personal Telco Project
• ERA — Enhanced Remote Access
• CSL — Communication Services Limited
• BRITE — Basic Rate Interface Transmission Extension
• AMSI — Ameritech Message Signal Interface
• ECHI — External Call History Interface
• WBCS — Wireless Business Communications Systems
• LR — Line Rate
• XDSL — x (any type of) Digital Subscriber Line
• CSL — Create a Simple Life
• WLN — WireLess Networking
• TGPSI — Transmission Gap Pattern Sequence Identifier
• IPOD — Internet Phone Over Data
• DB — Dial Back
• DCN — Data Communications Network
• RGC — Resource-Guaranteed Connection
• BYOP — Bring Your Own Portal
• CVSD — Continuously Variable Slope, Delta modulation
• ASR — Automatic Send-Receive
• WIVA — Wireless Integrated Voice Access
• TIC — Talking In Confidence
• WRI — Wireless Reader Interface
• CENTREX — Central Office Exchange
• WNA — Wireless Network Auburn
• TSD — Transmission System Development
• WNP — Wireless Number Portability
• TBR — Tagged Bit Rate
• WICD — Wireless Interface Connection Daemon
• SWF-DS1 — SWitched Fractional Digital Signal 1 line
• WWTA — World Wireless Technologies, Asia
• CDM — Code Division Multiplexing
• RTX — Real Telephone eXchange
• FOB — Forward on Busy
• CS — Customer Specification
• SSD — Source-surface Distance
• WCM — Wireless Connection Manager
• ULQ — User Level Quality
• IDDD — International Direct Dialing Designator

• ACF — Admission Confirm
• DNA — Daytime Nighttime Anytime
• WTSF — Wireless Telecommunication Services Facilities
• CF — Coin First
• WNAR — Wireless Network Access Requirements
• WLLD — Wireless Local Loop Delivery
• M-LEAD — Mouth Lead
• P — Planning
• SS — Single Step
• SAC — Syntax-based Arithmetic Coding
• TPC — Transmit Power Control
• SHIT — Single-Hop Infrastructure Transmission
• BCDMA — Broadband CDMA
• RBHC — Regional Bell Holding Company
• XI — X Identification (frame)
• SNECS — Single National Emergency Call System
• WLAR — Wireless LAN (Local Area Network) Access Repeater
• SPV — Sound, Picture, Voice
• WTDC — World Telecommunications Development Conference
• IRB — Instituteuction Reorder Buffer
• WNE — Wireless Network Experiment
• OTD — Open Terminal Directive
• RAT — Radio Access Technologies
• WGIS — Wireless Geographical Information System
• APTG — Amplifier Probe and Tone Generator Kit
• RTRP — Regional Telecommunications Restructuring Project
• WIGLE — Wireless Geographic Logging Engine
• TICS — Telecommunications And Instructional Computing Support
• WCS — Wireless Communication Services
• RSI — Repetative Strain Injury
• UDTX — Universal Data Transceiver
• WVAS — Wireless Value Added Services
• SDP — Service Definition and Provisioning
• DUNC — Dial-Up Networking Connection
• WAVE — Wireless Audio Visual Email
• TIP — Telecommunications Infrastructure Planning
• CRA — Constant Rate Allocation
• RCE — Region Code Enhancement
• WEXK — Wireless EXit Kit
• IWW — Internet World Wireless conference
• SS#7 — Signaling System # 7
• IKI — Institut Kosmitcheskikh Issledovanii
• UPPC — Up-Path Power Control
• ARE — All Routes Explorer
• VA — Voice Activity
• CNA — Cell Not Available
• EA — Emergency Action (JOC)
• VINF — Vista INformation Solution
• ISBX — Internet Satellite Broadcast Exchange
• MFT — Metallic Facilities Terminal

• WLA — WireLess Access
• WADS — Wireless Access Development System
• LE — Line Encryption
• BC — Burst copy
• ITNL — Indusind Telecom Network Ltd
• RWT — Receiver Wait Time
• BGSA — Banded Geographical Service Area
• DIP — Dialup Internet Protocol
• WAP — Wireless Access Provider
• WFUP — Wireless Fair Usage Policy
• RTE — Run-Time Environment
• STPI — Stentor Telecom Policy, Inc.
• GTA — GEORGIA TELECOMMUNICATIONS ASSOCIATION
• BTS — Business Telecommunications Services
• CTS — Cordless Telephone System
• MWC — Multi-Way Calling
• EDGE — Edhanced Data Rates for Global Evolution
• SPTC — Swaziland Post and Telecommunications Corporation
• TMR — Trunked Mobile Radio
• VWO — Virtual Wire Operations
• STN — Satellite Telecommunications Networks
• RES — Resident
• WOSN — Wireless Optimization Service Node
• CPIC — Cost Per Inbound Call
• SP — Single Purpose
• TTE — Tallahassee Telephone Exchange
• TSAPI — Telephony Server Application Programming Interface
• USLD — United States Long Distance
• DA — decanoic acid
• DUITS — Digital, Ubiquitous, Interoperable, Transparent and Secure
• TMO — Telecommunications Management Officer
• VERT — Vertical (distribution frame)
• TMAB — Telecom Managers Association of Belgium
• UTFX — Unit Testing Framework - XSLT (Extensible Stylesheet Language Transformation)
• TOS — Terms Of Service
• ACC — Automatic Carrier Control
• WNRL — Wireless Network Research Laboratory
• TCMS — Trunked Code Management System
• COPS — Caring Operators Personal Service
• WPMS — Wireless Pay phone Management System
• DMS — Digital Multiplex Switch
• CTWU — Chunghwa Telecom Workers' Union
• WTIS — Wireless Telecommunications Information & Services
• WLEC — WireLess Ethernet Converter
• VMAC — Voice Mobile Attenuation Code
• SSP — Secure Service Provider
• UNP — UN-Published
• RYC — Returned Your Call
• DCR — Dropped Call Rate
• WCTB — Wireless Campus TestBed

• WFII — Wireless Facilities Information Infrastructure
• VANS — Value Added Network Services
• EB — Expanded Basic
• TETRA — Trans-European Trunked RAdio
• ATP — Association of Telecom Professionals
• WBA — Wireless Business Application
• NE — Network Entity
• CD — Connect Direct
• TXC — Transmission Complete
• WTEL — Wireless TELephony
• IPM — Interpersonal Messaging System
• NCSU — North Carolina State Universityrsity
• PVS — Pennisula Video Surveillance
• DLT — Double Leading Tone
• DOS — data over signaling
• ASLV — Augumented Satellite Launch Vehicle
• SLLR — Single Line Loud Ringer
• IMR — International Mobile Roaming
• STA — State Transport Authority
• WT — Wireless Telephony
• CSP — Callback Service Provider
• WIMC — Wireless Intelligent Mobile Communicator
• T1 — 1,544 Mbits per Second line
• TUMS — Telephone and Utilities Maintenance System
• XA-SMDS — Exchange Access Switched Multi-Megabit Data Service
• RPS — Really Poor Service
• RR — Receiver Ready
• ADSRF — Additional Device Savings Recovery Fee
• NN — node number
• RTPB — Residential consumer Third Party Billing
• RPS — Reference Picture Selection
• CSP — Custom SIM Profile
• LSP — Local Support Provider
• VMW — Vertically Modulated Well
• UWT — United World Telecom
• RANN — Recorder ANNouncer
• WPMS — Wireless Protocol Management System
• DC — Dry Circuit
• MP — Management Processor
• RWL — RF (Radio Frequency) / Wireless Laboratory
• ATR — Advanced Telecommunications Research laboratory
• DRS — Dial Return System
• PTCL — Pakistan TeleComunication Land-line
• NAS — North American Standard
• MLP — Multi-layer Perception
• RII — Routing Information Indicator bit
• CF — Call Forward
• FB — Framing Bit
• TNS — Telephone Notification System
• QRW — Quasi-Random Word

• WDDF — Wireless Data Delivery Function
• CID — Call Instance Data
• UMTS — Unified Mobile Telecommunication System
• VMY — Voice Mobility
• WCIT — World Conference on International Telecommunications
• DFA — Distribution Feeder Antenna
• EPSCS — Enhanced Private Switch Controlled System
• UNE-P — Unbundled Network Element - Platform
• VFM — Voice/ Fax Module
• BCP — Before Cell Phones
• WICI — Wireless Innovations in Communications Initiative
• ICE — Information Content Exchange
• TLC — Telecommunication Link Controller
• SCRG — Servicing Carrier Reference Guide
• CAPS — Common ISDN API Service
• CFO — Core Funded Organization
• SVC — Signaling Virtual Channel
• SRP — Spatial Reuse Protocol
• VPF — Virtual Private Facility
• WIPSC — Wireless Intelligent Personal Server Consortium
• SDTA — South Dakota Telecommunications Association
• TLPU — Telecommunications Line Protector Unit
• TRF — Transmit Reject Filter
• SLC — Subscriber Line Concentrator
• SS2 — Signalling System 2 (600/750 Hz tones)
• CS — Carrier Sense
• ULLS — Unconditioned Local Loop Service
• EUCL — End User Common Line
• TTS — Telephone Traffic Simulator
• MLS — Mobile Location Services
• AV — AUTOVON
• RB — Randomized Block
• STX — Start of Transmission
• WWO — Wireless Work Order
• COC — Carrier of Carriers
• SFS — Start of Frame Sequence
• VMR — Video Mail Retrieval
• CF — Carrier Furnished
• IRMA — Interactive Remote Messaging Application
• DCPNZ — Daily transmission Charge for Peak Non-Zone network load
• FA — Failed Answer
• F — Flowability
• EUS — End User Segment
• HBOS — High-Bandwidth Optical Services
• WBIA — Wireless Broadband Internet Access
• WTS — Wireless Telecommunication Services
• VTAC — Vermont Telecommunications Application Center
• UMS — Universal Messaging System
• PTML — Pakistan Telecommunications Mobile, LTD.
• RSS — Remote Switching System

• RACE — Research into Advanced Communications in Europe
• ET — Exchange Termination
• CSM — Communications Services Management
• TL — Telephone Lead
• TNS — Terminating Noncritical Section
• IMM — Interactive Mobile Media
• SEFL — Single-Ended Fault Locating
• SRM — Short-Range Modem
• VLDS — Very Large Data Storage
• ET — Emerging Technologies
• SWNI — Smart Wireless Network Interface
• WCTP — Wireless Communication Transfer Protocol
• CTI — Computer Telephone Integration
• NMS — Network Management Service
• JLS — Just Lousy Service
• TPSN — Triple Play Subscriber Network
• SLT — Signaling Link Termination
• T — Tipper
• OR — Office Regenerator
• ARP — Access Responsible Party
• TBF — Telephone Band Filtering
• GDS — Generic Digital Services
• RZ — Receive ZModem
• EPPR — Empty Packet Production Rate
• WCFQ — Wireless Credit-based Fair Queueing
• RSS — Remote Switching Sites
• MAP — Management Assessment Program
• TBS — Telephone Billing Service
• TTD — Temporary Transmit Delay
• QNL — QoS Networking Laboratory, Boston University
• LQF — Line Quality Function
• ISC — Infrastructure Service Charge
• WTAI — Wireless Telephony Applications Interface
• VYP — Virtual Yellow Pages
• WNI — Wireless Network Interface
• HLB — Hierarchical Line Balancing
• UKB — Universal Keyboard
• VNTR — Variable Number Tandem Repeats
• WIZ — Wireless Internet Zone
• ACD — Apex Collaborative Dialing
• CD — Channel Delay
• WTNO — Wireless Technologies and Network Overview
• EMS — Element Management Service
• TELECOMMUTE — Telecommuters
• SN — Station Number
• UCC — Universal Connectivity Charge
• WIAX — WIreless Internet Access
• WOQS — Wireless Operator Quarterly Service
• RCS — Radio Cluster Server
• DCT — Digital Cordless Telecommunications

• WGS — Worldwide Geodesic System
• CP — Charging Party
• CPI — Computer-PBX Interface
• TIRKS — Trunk Integrated Records Keeping System
• VQL — Vector Quantizing Level
• WP7 — Windows Phone 7
• WBCT — Wireless Broadband Communications Technology
• VMES — Vehicle-Mounted Earth Station
• WNQR — Wireless Network Quality Review
• RINO — Roaming International Network Operator
• WWSI — Wireless Web Systems Integration
• VQI — Voice Quality Improvement
• IFLS — Inter-Frequency Load Sharing
• WGX — WebPhone Gateway eXchange
• TSI — Telecommunications Services Inc
• TCA — Telecom Computing Architecture
• MAPS — Maps Application Provisioning System
• BM — Maximum Burst size
• RYP — Romanian Yellow Pages
• DCCX — Direct Circuit Control Exchange
• WBSN — Wireless Broadband-Sharing Network
• SVD — Simultaneous Voice and Data Processor
• WDSN — Wireless Distributed Sensor Networks
• TAP — Telocator Alphanumeric Paging
• AMS — Analog and Mixed Signal
• RCMAG — Recent Change Memory Administration Group
• WLTG — Wireless LAN (Local Area Network) Technology Group
• SAM — System Administration Manager
• WWCE — World Wide Cellular Extension
• ITC — Interstate Telecommunications Cooperative
• ZFH — Novell ZENworks For Handhelds
• GRT — Georgian Railway Telecom
• TDSA — TELCO (TELephone COmpany) Distribution Support Architecture
• TFA — Toll Free Authorization
• HTI — Handoff Transfer Initiate
• LW — Long-wavelength
• PSN — Personal Subscription Number
• CLID — Calling Line IDentifier
• DA — Dodecanedioic Acid
• WWRF — Wireless World Research Forum
• ISA — Innovative Slot Allocation
• SIP — Service Interface Point
• DCPV — Daily Customer Pool Volume
• RDY/BSY — Ready/Busy
• CC — Connection Confirm
• TACS — Telephone Access Customer Satisfaction
• VODAFONE — Combined Voice, Data, Telephone:
• TIE — Telephone Interconnect Expansion
• SCC — Switching Control Center
• WSP — Wireless Signal Processor

• TMS — Time-Multiplexed Switch
• IPD — Intelligent Pulse Decoding
• SARS — Service Assistance Referral System
• CAS — Carrier Activity Sensor
• RAU — Residential Adaptor Unit
• WTFB — World Telecoms Financial Benchmarks
• WNPO — Wireless Number Portability Operations subcommittee
• TLR — Traffic Line Remover
• ICE — Integrated Communications Environment
• VMUI — Voice Mail User Interface
• WFQ — Weighted Fair Queueing
• ROI — Return On Information
• APTG — Academy for Professional TraininG
• VCC — Virtual Call Center
• AU — Audio Units
• WBGK — Wireless BridGe Kit
• R — Rimorchio (trailer)
• ISUP — International Standards Telecommunications Union
• VMS — Virtual Machine System
• VQE — Voice-Quality Enhancements
• CMM — Cable Management Module
• HN — Home Number
• SMI — Subsystem Multiplicity Indicator
• IDS — Information Directory Service
• FDS — Filtering, Distributing, and Serving
• AT — ATtention command
• TACS — Total Access Communications Systems
• UNLD — UNlimited Long Distance
• MLE — Metropolitan Line Extension
• WLSS — WireLess Select Switch
• PST — Public Safety Telecommunications
• RA — Return Alarm
• SMC — Switch Management Center
• ISM — Invocation State Machine
• WCRM — Wireless Customer Relationship Management
• ISD — Instituteuctional Systems Design
• UPMT — Universal Per-application Mobility management using Tunnels
• CAS — Combined Antennae Services
• WNQ — Wireless Network Quality
• TW — TWinbrook (telephone exchange)
• MFRM — Multi-carrier Flexible Radio Module
• WLIA — Wireless Location Industry Association
• SCAYNP — Someone Calls And You No Pay
• TBQ — Telecommunications Billing Question
• FSS — Fixed Satellite Services
• WTNPA — Wireless Telephone Number Portability Act
• LSI — Loop Start Interface
• VZP — Virtual Zapping Phone
• CSA — Carrier Servicing Area
• UTI — Union Internationale des Telecommunications

• RKB — Ring Knowledge Base
• FTFW — FactoryTalk For Windows
• TAB — Tape Automated Bonding
• RTS — Real-Time Simulator
• VIL — Voice Interconnect Link
• SRP — Specialized Resource Point
• TTR — Touch Tone Required
• WFOC — Wireless Full Operational Capability
• WIBR — WIreless gate BRidge
• DM — Distributed Management
• SA — Service Analysis
• QPW — QUIKPAGER Wireless
• PC — Process Control
• SCPI — Standard Commands for Programmable Instituteuments
• VO — Validation Office
• BPS — Baud per Second
• NM — Network Manager (GSFC)
• BOT — Baseline of Text
• WRBS — Wireless Router Base Station
• RTNZ — Rate for Transmission service for a Non-Zone load
• SNAP — Subnetwork Access Point
• CI — CHARM Interface
• CP — Customer Premises
• TSB — Telecommunications System Bulletin
• C — Connection
• SOA — Service Order Administration
• RDN — Relative Distinguishing Name
• IAC — Install And Commission
• O — Oblique
• LAW — Local Area Wireless
• SRD — Short Range Devices
• PSP — Payphone Service Provider
• PTA — Pre-Transmission Audit
• TSM — Telecommunications Systems Management
• TELEX — TELegraph EXchange
• ALS — Alternative Line Service
• TRD — Timed Release Disconnect
• ITR — Intelligent Text Retrieval
• WWZA — Wireless WorkZone Alliance
• BP — Burst Period
• B — Bits
• LTS — Laboratory for Telecommunication Sciences
• WTSO — Washington Telecommunications Services and Operations
• URQ — Unregistration Request
• QC — Quality Conversation
• WRB — Wireless Receiver Box
• WMBD — Wireless Media Broadcast Device
• FAST — Field Automated Subscriber Testing
• RTDF — Rural Telecomunication Development Fund
• WMIP — Wireless-Mobility Integration Protocol

• WGEN — Wireless GENeration
• STC — Signaling Transport Converter
• WLDD — Wireless Location-Dependent Data
• WLSM — Wireless LAN (Local Area Network) Springboard Module
• WEWI — Wireline Electronic Weight Indicator
• TMD — Trunk Main Distributing
• WCS — Wireless Coupon System
• GC — Global Communications
• TIM — Telecom Idea Management
• PSA — Protocol-Specific Annex
• O — Other
• AL — Alignment Level
• TMC — Timeslot Management Channel
• TIRF — Telecoms Industry Regulatory Forum
• DB — Dropped Burst
• FPS — Fast Packet Switching
• ITP — Interdisciplinary Telecom Program
• DD — Digit Directory
• IAV — Images, Audio, Video
• TJR — Trunk and Junction Routing
• MARS — Military Affiliated Radio System
• MAP — Manufacturers Application Protocol
• SG — Supergroup
• SCC — Service Connection Charges
• BT — Best Telecommunications
• FT — Field Testing
• WLDS — Wilkes Long Distance Service
• ISI — Institute of Scientific Information
• TWT — Time Warner Telecom
• WUSI — Wireless Universal Strike Interface
• TPQ — Transmission Power Quality
• ACF — Advanced Communications Facility
• TTP — Third-Party Provider
• CT — Channel Termination
• SSG — Signalling Server Global
• TPS — Transmission Parameter Signalling
• PTC — Pacific Telecommunications Council
• TCT — Tin Can Technology
• TTFG — Telecommunications Technology Forecasting Group
• FP — Full Period of service
• CUA — Call Unit Autodialer
• PWP — Plastic Wall Phone
• MB — Medium Band
• WFZ — Wire Free Zone
• MMS — Meteorological Measurement System
• DT — Dialup Terminal
• F — Farenheit
• WCOE — Wireless Center of Excellence
• WPCS — Wireless Personal Communications Services
• TAC — Terminal Access Circuit

• SDNB — Secondary DN Call Blocking
• WHIW — Wireless Home Installation Wizard
• SIO — Subscribers In Operation
• SMS — Server Malloc (Memory ALLOCation) System
• MCN — Mittweidaer CampusNet
• WNPD — Wireless Network Persistent Data
• BTS — Best Transmission Second
• WRBB — Wireless Rural BroadBand
• SD — Signal distribution
• BS — Basic Service
• UA — Universal Access
• ITR — International Telecommunication Regulations
• RIM — Remote Integrated Mulitplexor
• SLM — Signal Line Measurement
• PD — Power Distribution
• TIE — Telephone Interconnect Equipment
• SAG — Subscription Assignment Group
• WTRN — Wireless Token Ring Network
• TCO — Total Connection Operation
• WWYP — Westford Web Yellow Pages
• LTA — Leased Transport Area
• TSL — Transaction Sublayer
• SX — Simplex (one-way)
• TDU — T1 Distribution Unit
• SMT — Secure Mobile Transfer
• CRT — Combined Rlogin and Telnet
• CU — Copper Local Loop
• FC — Fiber Channel
• SE — Status Enquiry
• RO — Recieve Only
• S — Subscriber
• RCVS — Recharge Card Voucher System
• WLSE — Wireless LAN (Local Area Network) Solution Engine
• IVS — Interactive Video Services
• NSC — Non-Standard Facilities Command
• AMI — Alternate Mark Indicator
• RC — Rudy's Cellular
• RPT — Reply Paid Telegram
• ETC — Eligible Telecommunications Carrier
• UIQ — User Interface Quartz
• TVM — T1 Voice Module
• WTCD — World Telephone Card Databank
• VWM — Virtual Wire Manager
• TES — Telecom Electric Supply
• BS — Burst Selector
• GTI — Graphics, Text, and Images
• FAS — Fals ansewring supervision
• SCP — Service Commitment Period
• WURST — Wideband, Uniform Rate, Smooth Truncation
• DTS — Data Telecom Support

• QOB — Quality Of Burst
• PSS — Phone Search Space
• WIXC — Wireless Internet eXpress Connection
• SAM — Sme Access For Mobile
• WIKS — Wireless Interactive Keypad System
• VIS — Vodafone International Services
• CTM — Cellular Textphone Modem
• WIEA — Wireless Internet Enterprise Application
• CAT — Charges, Access, and Terms
• RC — Rating and Certification
• TS — Tip and Sleeve
• WBOX — Wireless in a Box
• LVZ — Line Variance Zero
• CAL — Connection Access License
• WLHP — WireLess HeadPhone
• SSS — Self-Synchronous Scrambling
• STS — Small Telephone System
• DS — Data Service
• IPS — Instituteuctions Per Second
• SLM — Signal Leakage Meter
• ROS — Remote Operations Service
• SCC — SuperComputer Center
• MBS — Meter Backflow Services
• CTR — Carrier Telegraph Receiver
• VIEW — Virtual Interface Environment Workstation
• AP — Applications Processor
• CPP — Calling Party Pay
• TO — Telecommunications Operator
• TOPS — Terahertz to Optical Pulse Source
• MC — Make Call
• RTA — Rapid Thermal Annealing
• LCWN — LiveCache Wireless Network
• SS4 — Signalling System 4 (2040/2400 Hz tones)
• FL — Fiber Link
• STR — Synchronous Transmitter/Reciever
• TT — Touch Tone
• LG — Line Good
• TCP — Telephone Connecting Program
• WWZ — Wireless Work Zone
• TAP — Telecommunity Appalachian Project
• WRAPS — Wireless Remote Audio Perimeter Sharing
• FTW — France Telecom Wireless
• OC — Operations Channel
• ALS — Accounts Ledger System
• RDD — Random Digit Dialing
• VTS — Virtual Talk Session
• SPF — Summertime Phone Functionality
• ASB — Application-Specific Bit
• RAS — Remote Access Services
• EOC — End Of Contents

• RTB — Remote Telephone Bell
• AN — Accessory Number
• TOS — Testing Operation System
• SIF — Signaling Information Fields
• SO — Serving Office
• RCS — Real Communication Solution
• TI — Time Independent
• RI — Ring Indicate
• PPC — Pay-Per-Call
• DE — Development Estimate
• TS — Telecom Server
• ESP — Electro-Selective Pattern
• TC — Terminating Channel
• WCZO — Wireless Communication Zoning Ordinance
• SCD — Strong Commit Dependency
• VR — Variable Rate
• ITA — Inferior Telecommunications Apparatus
• HS — Heterogeneous Services
• YPBX — Ytelco Private Branch Exchange
• WLHB — WireLine HandBook
• RSU — Required Service Utilization
• SI — Service Indication
• SB — Service Billing
• TT — Tiny Telephone
• MCA — Missed Calls Alert
• MCP — Mobile Centered Paging
• RB — Reverse Billing
• WIUB — WIreless Universal Base-mounted
• CTR — Covert Telephone Recording
• TPI — Tip-Party Identification
• SCM — Selected Communications Mode
• TSR — Telephone Special Range
• RD — Receive Delay
• RI — Receiver Induced
• ER — EntityRelationship
• SC — Supervisory Center
• SD — Software Distributor
• TLC — Transparent Line Control
• VZBB — Verizon BroadBand
• T — Telecom
• RB — Resource Bearer
• IMS — Internal Messaging System
• WOW — WithOut Wires
• SU — Service Unlimited
• TP — Typical Provider
• SSC — Service Shortcut Changer
• RT — Refuse Transmission
• TOC — Telecommunications Outdoor Connectors
• SR — Subscriber Ready

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