toggle menu

Home / Computing & IT / Telecom

Computing & IT >> Telecom Abbreviations

Look through 4999 acronyms and abbreviations related to Telecom:

• XFMR — Transformer
• IPB — Invision Power Board
• LAN — Local Area Network
• URL — Universal Resource Locator
• DDRS — Dynamic Data Rate Selection
• EBITDA — Earnings before Interest, Taxes, Depreciation and Amortization
• YTD — Year To Date
• ETA — Estimated Time of Arrival
• EDD — Earliest Due Date
• YMMV — Your Mileage May Vary
• OIC — Oh I See
• GFSK — Gaussian Frequency Shift Keying
• XML — Extensible Markup Language
• BBS — Bulletin Board Service
• ASAP — As Soon As Possible (pronounced AY-sap)
• CBCU — Centralized Broadband Control Unit
• OEM — Original Equipment Manufacturer (usually in reference to car parts)
• DND — Do Not Disturb
• ECG — Electrocardiogram
• ANSI — American National Standards Institute, Inc.
• DCE — Data Circuit-terminating Equipment
• CSMA/CA — Carrier Sense Multiple Access/Collision Avoidance
• THX — Thanks
• ROM — Read-Only Memory
• FTP — File Transfer Protocol
• BTW — By The Way
• PPM — parts per million
• APR — Annual Percentage Rate
• NMSE — Normalized Mean Square Error
• IT — Information Technology
• ARP — Address Resolution Protocol (ATM)
• LASER — Light Amplification By Stimulated Emission Of Radiation (cf. Maser)
• C4I — Command, Control, Communications, Computers, & Intelligence
• EPA — Environmental Protection Agency (US)
• YGWYPF — You Get What You Pay For
• CSR — Customer Service Representative
• DWDM — Dense Wavelength Division Multiplexing
• UK — United Kingdom of Great Britain and Northern Ireland
• CPU — Central Processing Unit
• LRU — Line Replaceable Unit
• CU — See You
• COB — close of business (End of duty day)
• POC — Point Of Contact
• 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.
• C3I — Command, Control, Communications & Intelligence
• IQ — Intelligence Quotient
• IP — Internet Protocol
• BRDF — Bidirectional Reflectance Distribution Function
• ATM — Automatic Teller Machine
• CCTV — Closed-circuit television

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

• O&M — Operation and Maintenance
• WACN ID — Wide Area Communications Network IDentifier
• PO — Purchase Order
• ASTM — American Society for Testing and Materials (Philadelphia, Pennsylvania)
• EU — European Union (1994; formerly referred to as the EEC or EC)
• TBD — To Be Determined
• ATM — Asynchronous Transfer Mode
• AMD — Advanced Micro Devices, Inc. (producer of computer chips)
• UR — Your
• EAP — Employee Assistance Program
• TEMIP — Telecommunications Management Information Platform
• DOA — dead on arrival
• SME — Subject Matter Expert
• WBS — Work Breakdown Structure
• WTG — Way To Go
• VPN — Virtual Private Network (ATM)
• GIS — Geographic Information System
• GSM — Global System for Mobile Communications
• RAEX — Roaming Agreement EXchange
• ATTN — Attention
• XA-FR — Exchange Access Frame Relay
• CCB — Change Control Board
• EST — Eastern Standard Time
• CDR — Critical Design Review
• WB — Welcome Back
• X-OFF — Transmitter Off
• ABC — activity based costing
• SMTP — Simple Mail Transfer Protocol
• CPE — Customer Premises Equipment
• HTTP — Hypertext Transfer Protocol
• PDR — Preliminary Design Review
• IRR — Internal Rate of Return
• GPS — Global Positioning System (ex-NAVSTAR)
• ASME — American Society of Mechanical Engineers
• VIP — Very Important Person
• FET — Field Effect Transistor
• OC-256 — Optical Carrier Signal, Level 256
• S-BCCH — Short Message Service Broadcast Control Channel
• FDIC — Federal Deposit Insurance Corporation
• QFSK — Quadrature Frequency Shift Keying
• DOD — United States Department of Defense
• E-LEAD — Ear Lead
• QA — Center for Quality Assurance in International Education
• WWW — World Wide Web
• IPO — Initial Public Offering
• ARPA — Advanced Research Projects Agency (made early internet)
• JIT — Just in time
• B-ICI — Broadband Inter-Carrier Interface
• ACK — Acknowledge (telecommunications; Cf. NAK)
• AUP — Acceptable Use Policy

• A-KEY — Authentication key
• X-ON — Transmitter On
• C-NBAP — Common Node B Application Part
• SOW — Statement Of Work
• ADSL — Asymmetric Digital Subscriber Line
• ZDBOP — Ziff-Davis Benchmark Operation
• MIS — Management Information System (OSHA)
• UAX 14 — Unit Automatic eXchange type 14
• AM — Amplitude Modulation
• VAT — Value Added Tax
• PDA — Personal Digital Assistant
• SRAM — Static Random Access Memory (ess-ram)
• CV — Curriculum Vitae
• DARPA — Defense Advanced Research Projects Agency (US)
• SLA — Service Level Agreement
• PVT — Private
• OCR — Optical Character Recognition
• CAD — Computer Aided Designer
• IRL — In Real Life
• PGP — Pretty Good Privacy (encryption)
• ACH — Automated Clearing House
• ACE — Access Control Entry
• RFQ — Request For Quotation
• CD — Compact Disc
• CRM — Customer Relationship Management
• DAHDI — Digium/Asterisk Hardware Device Interface
• OC-18 — Optical Carrier Signal, Level 18
• 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
• ESA — European Space Agency
• RAM — random-access memory
• 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.
• MLS — Microwave Landing System
• PCB — printed circuit board
• MDF — Main Distribution Frame
• ICT — Information and Communication Technology
• ATOM — Any Transport over MPLS (Multi-Protocol Label Switching)
• SWAG — Scientific Wild Ass Guess
• RFI — Request For Information. Sales department shorthand. Special priority when use in conjunction with RFN (see below).
• I.LINK — IEEE 1394, High Performance Serial Bus, implementation
• EOM — End Of Message
• NSF — National Sanitation Foundation
• AM — Ante Meridian
• D-NBAP — Dedicated Node B Application Part
• WAN — Wide Area Network
• DRAM — Dynamic Random Access Memory (dee-ram) (computing)
• CC — Carbon Copy
• CAE — Computer-Aided Engineering
• ISDN — Integrated Services Digital Network
• M-CSI — Mobility management CAMEL (Customized Applications for Mobile network Enhanced Logic) Subscription Information
• AGC — Automatic Gain Control

• T-CARRIER — Trunk Carrier
• DSS — Decision Support System
• ASA — American Standards Association
• MOB — Mobile
• BBS — Bulletin Board System
• ATA — Area Transportation Authority
• TTYL — Talk To You Later (Internet Slang)
• LED — law enforcement desk; light emitting diode
• ABI — Application Binary Interface
• CIO — Chief Information Officer
• T-IC — T-interConnect
• SABGW — System Architecture Evolution Gateway
• H323 — ANSI standard for format over IP
• CSMA/CD — Carrier sense multiple access / collision detection
• TNX — Thanks
• C³CM — Command, Control and Communications Countermeasures
• JV — Joint Venture
• IETF — Internet Engineering Task Force
• PC — Personal computer (host)
• DES — Data Encryption Standard
• IVR — Interactive Voice Response (telephone technology)
• RFC — Request For Comment
• DHCP — Dynamic Host Configuration Protocol
• CDT — Central Daylight Time
• FIPS — Federal Information Processing Standard
• OC-9 — Optical Carrier Signal, Level 9
• KBYTE — Kilobyte (103)
• COO — Chief Operation Officer
• ECU — Electronic Control Unit
• CBT — Computer Based Training
• GATT — General Agreement on Tariffs and Trade (government)
• POP — Point Of Presence (Internet)
• VC-ATOD — Virtual Clearinghouse on Alcohol, Tobacco and Other Drugs
• FFT — Fast Fourier Transform
• HVAC — Heating, Ventilation, and Air Conditioning
• EIS — Executive Information System
• RPI — Retail Price Index
• DOS — Disk Operating System
• FSAI — Fiber Serving Area Interface
• ATC — Air traffic control
• SQL — Structured Query Language
• BCC — Blind Carbon Copy
• CMS — Content Management System
• QOS — Quality of Service
• WYSIWYG — What You See Is What You Get (pronounced Wizzy-wig. See Entry For Derived Acronyms)
• ASP — Application Service Provider
• HZ — cycles per second (hertz)
• KISS — Keep It Simple Stupid
• CPM — Critical Path Method
• RDBMS — Relational Database Management System

• RQMTS — Requirements
• SDD — Software Design Document
• ITU — International Telecommunication Union
• CST — Central Standard Time (UTC-6 Hours)
• WML — Wireless Markup Language
• ROI — Return on Investment
• NFS — Network File System
• CSA — Canadian Space Agency
• FAA — Federal Aviation Administration
• RFO — Reason For Outage
• CONG — Congestion message
• MTTR — Mean Time To Repair
• ACM — Association for Computing Machinery
• VAZO — Violating All-Zero Octet
• PNG — Portable Network Graphics (graphic file standard/extension)
• EDS — Electronic Data Systems Corporation
• SAN — Storage Area Network
• SAR — Search And Rescue
• VHF — Very High Frequency
• IRS — U.S. Internal Revenue Service
• CSMA — Carrier Sense Multiple Access
• NIST — National Institute of Standards and Technology
• CIR — Committed Information Rate (Frame Relay)
• DCOM — Distributed Component Object Model
• CGI — Common Gateway Interface
• AES — Advanced Encryption Standard
• CFO — Communication Filing Officer
• NYSE — New York Stock Exchange
• 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
• SDR — Special Drawing Rights
• DNS — Domain Name System
• CIS — Commonwealth of Independent States
• SLIP — Serial Line Interface Protocol
• AIR — Account Information and Refill
• DNS — Domain Name Service
• DSC — Differential Scanning Calorimetry
• NATO — North Atlantic Treaty Organisation
• DBORS — Data Base of Records
• PRI — Primary Rate Interface (ISDN)
• PUHU — Pick Up Hang Up
• DLL — Dynamic Link Library (computer file)
• QMS — Quality Management System
• SSL — Secure Socket Layer
• ADD — Addendum
• CUG — Closed User Group
• PDH — Plesiochronous Digital Hierarchy
• ECO — Engineering Change Order
• PM — Preventive Maintenance
• EOT — End Of Transmission
• EEC — European Economic Community (predecessor of the European Union|EU)

• DSL — Digital Subscriber Line
• EFT — Electronic Funds Transfer
• UTC — Coordinated Universal Time
• BPS — bits per second
• SAS — Statistical Analysis System
• VM — Voice Mail
• CAM — computer aided manufacturing
• RDY — Ready
• UDP — User Datagram Protocol (FDDI related)
• FX — Foreign Exchange
• SQA — Software Quality Assurance
• NMR — Nuclear Magnetic Resonance
• ADM — Add-Drop Multiplexer
• DOJ — Department of Justice (US)
• NA — Not Applicable
• COR — Carrier Operated Relay
• DAC — Discretionary Access Control
• EC — European Commission
• UI — User Interface
• ROFL — Rolling on the floor laughing
• MIPS — Millions of Instructions Per Second
• PST — Pacific Standard Time (UTC-8 Hours)
• IP — Intellectual Property
• MB — Megabyte
• SIC — Standard Industrial Classification (Code)
• CLI — Command line Interface (Cabletron)
• GSA — U.S. General Services Administration
• BSOD — Blue Screen Of Death
• WWW3 — World Wide Web Consortium
• UHF — Ultra High Frequency (300-3000 MHz; 1m-10cm)
• DB — Decibel
• DBMS — Database Management System
• ATCRBS — Air Traffic Control Radar Beacon System
• GPRS — General Packet Radio Service
• EEG — Electro-EncephaloGram
• ADR — Address
• AE — Account Executive
• UAV — Unmanned Aerial Vehicle
• DAM — Diagnostic Acceptability Measure
• SCM — Supply Chain Management
• Q&A — Question & Answer
• NIH — Not Invented Here
• BVR — Beyond Visual Range
• AOL — America on line
• EVP — Executive Vice President
• DC — Direct Current
• PSTN — Public Switched Telephone Network
• NTIS — National Technical Information Service Technology Administration
• NOAA — National Oceanic and Atmospheric Administration (US)
• ACL — Access Control List

• EBCDIC — Extended Binary Coded Decimal Interchange Code (pronounced Eb-see-dik) (cf. BCD)
• USGS — United States Geological Survey (DOI)
• FCC — Federal Communications Commission (US)
• AAAS — American Association for the Advancement of Science
• AT&T — American Telephone and Telegraph (U.S. company, also known as "Ma Bell")
• MST — Mountain Standard Time
• SCSI — Small Computer System Interface
• DDE — Dynamic Data Exchange (in software parlance)
• UN — United Narions
• NPI — New Product Introduction
• ADPE — Automatic Data Processing Equipment
• MHS — Message Handling System (electronic)
• CRC — Contrôle de Redondance Cyclique (French: Cyclic Redundancy Check)
• OFC — Office
• NEC — National Electrical Code
• AGP — Accelerated Graphics Port
• CUL — See You Later
• BPR — Business Process Re-engineering
• CS — Computer Science
• EDT — Eastern Daylight Time
• LF — Low Frequency
• ACE — Advanced Computing Environment
• VVX — Voice and Video eXchange
• B2B — Business to Businesse
• ACK — ACKnowledgment
• NOS — Network Operating System
• BR — Branch
• W3C — World Wide Web Consortium
• STP — standard temperature and pressure (0° and 1 atm)
• PERT — Program Evaluation and Review Technique
• OS — Operating System
• AOA — Angle Of Arrival
• CMM — Capability Maturity Model
• TCO — Total Cost of Ownership
• BRI — Basic Rate Interface
• TCP — Transmission Control Protocol
• I/O — Input/Output
• M — Meter
• WWW — World Weather Watch
• AQL — Acceptable Quality Level
• PVC — Permanent Virtual Circuit (ATM)
• CPT — Carriage Paid To
• SOHO — Small Office Home Office
• IANA — Internet Assigned Numbers Authority
• PM — Project Manager
• CAA — Civil Aviation Authority
• ABET — Accreditation Board for Engineering and Technology, Inc.
• OSHA — Occupational Safety and Health Act (1970)
• LMS — Learning management system
• DSA — Digital Signature Algorithm

• FDDI — Fiber Distributed Data Interface
• D-H — Diffie-Hellman
• NEMA — National Electric Manufacturer's Association
• AIS — Automated Information System
• CIA — Central Intelligence Agency
• MBR — Master Boot Record
• UPS — Ultraviolet Photoelectron Spectroscopy
• APT — Automatic Picture Transmission
• CDMA — Code Division Multiple Access (voice/data transmission)
• BST — British Summer Time
• OMG — Object Management Group
• KHZ — kilohertz (1000 cycles per second)
• AT&T — American Telephone & Telegraph
• SCC — Standards Council of Canada
• EDVAC — Electronic Discrete Variable Automatic Computer
• BSD — Berkeley Software Distribution
• DTE — Data Terminal Equipment
• DQPSK — Differential Quadrature Phase-Shift Keying
• RWR — Radar Warning Receiver
• ERP — Enterprise Resource Planning
• SBU — Strategic Business Units
• RAID — Redundant Array of Inexpensive Disks
• SNMP — Simple Network Management Protocol (ATM)
• SAIC — Science Applications International Corporation
• MSN — Microsoft Network
• PMA — Physical Medium Attachment
• T&C — Terms & Conditions
• AAC — Advanced Audio Coding
• FM — frequency modulation
• DDD — Direct Distance Dial
• MAC — Media Access Control
• JPEG — Joint Photographic Experts Group (24-bit image storage format)
• DDL — Data Definition Language
• MLS — Multiple Listing Service
• WMO — World Meteorological Organization (ICSU)
• BER — Bit-Error Rate
• TC — Telephone Call
• ROS — Return on Sales
• AWG — American Wire Gauge
• RFD — Request For Discussion
• IM — Instant Message
• ZIP — Zone Improvement Plan
• 9 — Nine
• SAE — Society of Automotive Engineers
• KM — Knowledge Management
• PBX — Private Branch eXchange (company phone system)
• OM — Old Man
• ACC — Adaptive Cruise Control
• HTML — Hyper Text Markup Language
• TV — Television

• ABR — Available Bit Rate
• SDMA — Space Division Multiple Access
• RM — Regional Manager
• TNSTAAFL — There's No Such Thing As A Free Lunch
• BT — British Telecommunications
• CM — Configuration Management
• WDM — Wavelength Division Multiplexing (fiber optics)
• DMA — direct memory access (computer term)
• Z — Zero
• LD — Long Distance
• BIOS — Basic Input Output System
• ISBN — International Standard Book Number (ISO 2108)
• ERT — Emergency Response Team
• RFI — Radio Frequency Interference
• ENIAC — Electronic Numerical Integrator And Computer
• CW — Continuous Wave
• RMS — root mean square (preferred over "RMS")
• USB — Universal Serial Bus
• ICANN — Internet Corporation for Assigned Names and Numbers
• EAI — Enterprise Application Integration
• CB — Call Back
• CORBA — Common Object Request Broker Architecture
• AADC — Automated Area Distribution Center
• DME — Distance Measuring Equipment
• CU — Control Unit
• TNYWR — The Number You Will Receive
• GB — Gigabyte
• AF — Audio Frequency
• CIS — CompuServe Information Service
• PM — post meridian
• MMS — Multimedia Messaging Service
• PPP — Point-to-Point Protocol
• NRC — National Research Council (Canada)
• ADN — Advanced Digital Network
• WEP — Wired Equivalent Privacy
• AFC — Automatic Frequency Control
• EMG — Electromyogram
• LEO — Low Earth Orbit (satellite communications)
• DMSP — Defense Meteorological Satellite Program (U.S.)
• Y2K — Year 2000
• DWDM — Dense Wavelength-Division Multiplexing
• PECVD — Plasma-Enhanced Chemical Vapor Deposition
• WAP — Wireless Application Protocol
• ADT — Atlantic Daylight Time (UTC-3 Hours)
• WTO — World Trade Organisation
• RSN — Real Soon Now [which may be a long time coming]
• ROTFL — Roll On The Floor Laughing
• NIST — National Institute of Standards & Technology (US)
• SEI — Software Engineering Institute
• NIMBY — Not In My Back Yard

• NIC — Network Interface Card
• CG — Center of Gravity (DXS)
• EMC — Electromagnetic Compatibility
• DSP — Digital Signal Processor
• CMD — Command
• AC — Access Control
• EEPROM — Electrically Erasable Programmable Read-Only Memory
• SHA — Secure Hash Algorithm
• PDN — Public Data Network
• VR — Virtual Reality
• ISS — International Space Station
• AYT — Are You There
• EOB — End Of Business
• JAXA — Japan Aerospace Exploration Agency
• ELF — Extremely Low Frequency
• MGMT — Management
• RPC — Remote Procedure Call
• PPB — parts per billion (109)
• NBS — National Bureau of Standards (US)
• CFV — Call For Vote(s)
• AATSR — Advanced Along-Track Scanning Radiometer
• VBR — Variable Bit Rate (ATM)
• ISSN — International Standard Serial Number (ISO 3297)
• AE — Application Entity
• ECP — Engineering Change Proposals
• 100BASE-T2 — 100 Megabits per Second, Baseband, Two-pair Category 3 UTP cables
• MIME — Multipurpose Internet Mail Extension
• ACTV — Active
• DC — Disconnected
• ACD — Automatic Call Distributor
• OSI — Open Systems Interconnection (iso Standard)
• LDAP — Lightweight Directory Access Protocol (pronounced Ell-dap)
• DTI — Department of Trade and Industry (UK)
• OBO — Or Best Offer
• AEC — Architecture, Engineering, Construction
• EPR — Ethylene-Propylene Rubber
• VOL — Volume
• EDP — Electronic Data Processing Plc (London Stock Exchange [LSE])
• ASEAN — Association of South East Asian Nations
• MBPS — Megabits per second
• RM — Resource Management
• NAFTA — North American Free Trade Agreement
• ALC — Automatic Level Control
• EW — Electronic Warfare
• CAD — Computer-Aided Design
• SVP — Senior Vice President
• UPS — Uninterruptible Power Supply
• SNR — Signal-to-Noise Ratio
• CES — Consumer Electronics Show
• CCM — counter-countermeasure

• ASR — Airport Surveillance Radar
• COQ — Cost Of Quality
• DRM — Digital Rights Management
• AAAI — American Association for Artificial Intelligence's
• HDML — Handheld Device Markup Language
• ELINT — Electronic Intelligence Satellite
• LEC — Local Exchange Carrier
• SMS — Short Message Service
• CRL — Certificate Revocation List
• AMT — Amount
• PDU — Protocol data unit (such as segment, packet, frame, etc.)
• CTD — Cumulative Trauma Disorder
• SGML — Standard Generalized Markup Language
• PD — Public Domain
• BCD — Binary-Coded Decimal
• ICMP — Internet Control Message Protocol
• ATS — applications technology satellite
• PET — positron emission tomography
• YL — Young Lady
• BYOD — Bring Your Own Device
• CCNA — Cisco Certified Network Associated
• EISA — Extended Industry Standard Architecture
• MIB — Management Information Base (ATM)
• AES — Auger Electron Spectroscopy
• NSA — National Security Agency
• ECE — Economische Commissie voor Europa (United Nations) (Dutch: Economic Commission for Europe)
• DFD — Displaced Frame Difference
• RIP — Routing Information Protocol
• APPL — Application
• PIN — Personal Identification Number
• BIP — Bit-Interleaved Parity
• AVHRR — Advanced Very High Resolution Radiometer  
• VLF — Very Low Frequency
• CCSDS — Consultative/Consultative Committee for Space Data Systems
• MF — Medium Frequency
• PCMCIA — Personal Computer Memory Card International Association
• SDH — Synchronous Digital Hierarchy (ATM)
• STS — Space Transportation System
• AME — Amplitude Modulation Equivalent
• CFD — Call For Discussion
• BGP — Border Gateway Protocol (routing protocol)
• CHAP — Challenge Handshake Authentication Protocol (ATM)
• DLR — Design Layout Record
• AVL — Available
• HW — Hardware
• NCSA — National Center for Supercomputing Applications
• SCADA — Supervisory Control And Data Aquisition
• EAP — Extensible Authentication Protocol
• WIPO — World Intellectual Property Organization
• DQE — Detective Quantum Efficiency

• TEL — Telephone
• BUS — Business
• SPC — Statistical Process Control. Forerunning quality theory from the 1960s to TQC and TQM.
• AD — Active Directory
• IEC — International Electrotechnical Commission
• PSK — phase-shift keying
• USD — United States Dollar
• TCP/IP — transmission control protocol/internet protocol
• CIM — Common Information Model
• 911 — Emergency Services Phone Number
• DSSS — Direct Sequence Spread Spectrum
• SOAP — Simple Object Access Protocol
• EEHO — Either End Hop Off
• OLE — Object Linking and Embedding (Microsoft communication protocol)
• WB — Write Back
• CG — Coast Guard
• VOIP — Voice Over IP (Internet Protocol)
• RU — Are You?
• RTU — Remote Terminal Unit
• PCM — Pulse-Code Modulation
• LCP — Link Control Protocol
• SBC — Southwestern Bell Corporation
• LF — Line Feed
• ISAKMP — Internet Security Association and Key Management Protocol
• FCS — Frame check sequence (Ethernet)
• WORM — Write-Once, Read-Many
• 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)
• SOGA — Share of Gross Adds
• FASB — Financial Accounting Standards Board
• EGA — Enhanced Graphics Adapter
• ATN — Aeronautical Telecommunication Network
• MMU — Memory Management Unit
• ADC — Analog-Digital Converter
• DOM — Document Object Model
• OSPF — Open Shortest Path First (ATM)
• NTIA — National Telecommunications and Information Administration
• ASQC — American Society for Quality Control's
• CCSD — command communications service designator; control communications service designator
• SIG — Special Interest Group
• CHF — Swiss Franc
• JPL — Jet Propulsion Laboratory (California Institute of Technology) (NASA)
• HTTPS — HyperText Transfer Protocol Secure
• MAC — Message Authentication Code
• DCN — Design Change Notification
• RNC — Radio Network Controller
• IRS — Interface Requirements Specification
• ARA — Apple Remote Access
• RACF — Resource Access Control Facility
• MS — Millisecond
• VAC — Vacant

• CMI — Computer Managed Instruction
• AMI — Advanced Metering Infrastructure
• CRIS — Carrier Route Information System
• ISAS — Institute of Space and Astronautical Sciences (Japan)
• ACPI — Advanced Configuration and Power Interface
• RACON — Radar Beacon
• HF — High Frequency
• BNSC — British National Space Centre
• LRJ — Location Reject
• CCD — Charge Coupled Device - a device for the movement of electrical charge.
• LP — Low Pressure
• PT — Project Team
• FAR — Federal Aviation Regulation
• AIS — Alarm Indication Signal
• SDK — Software Development Kit (Microsoft)
• EFF — Electronic Frontier Foundation
• JVM — Java Virtual Machine
• EDD — Envelope Delay Distortion
• ITSEC — Information Technology Security Evaluation Criteria
• ECMA — European Computer Manufacturer's Association
• TCB — Trusted Computing Base
• B2C — Business-to-Consumer
• IPVX — Internet Protocol version X
• PLD — Programmable Logic Device
• BOFH — Bastard Operator From Hell
• OCC — Occupancy
• PABX — private automatic branch exchange (telephone)
• MRC — Monthly Recurring Charge
• TAG — Technical Advisory Group for Biological Control Agents of Weeds
• DSTE — Digital Subscriber Terminal Equipment
• FCA — Free Carrier
• DFS — Distributed File System
• ACT — ACTIVITY, ACTIVITIES
• CSO — Customer Service Operations
• QAM — quadrature amplitude modulation
• BSA — Business Software Alliance
• APIC — Advanced Programmable Interrupt Controller
• ISMI — International mobile subscriber identity
• D-RAM — Dynamic Random Access Memory
• C4 — Command, Control, Communications, and Computers
• JST — Japan Standard Time
• HSDPA — High-Speed Downlink Packet Access
• GHZ — Gigahertz
• OSS — Operational Support System
• RAD — Rapid Application Development
• CMP — Connection Management Protocol
• NOC — Network Operations Center
• ASQ — Alpha System Qualification
• 100BASE-T — 100 Megabits per second, Baseband, Twisted pair
• WG — Working Group

• BIS — Bureau of Indian Standards
• NESDIS — National Environmental Satellite, Data, and Information Service
• DCE — Distributed Computing Environment
• MCD — Magnetic Circular Dichroism
• TLS — Transport Layer Security
• KB — Kilobyte: One thousand and twenty-four bytes kbps kilo bit per second
• CBC — cipher block chaining
• POTS — Plain Old Telephone Service (FCW)
• RDP — Radar Data Processing
• AP — Application Protocol
• HDLC — High-Level Data Link Control
• DASD — Direct Access Storage Device
• ECR — Electronic Cash Register
• AT — Advanced Technology
• BG — Background
• AMHS — Automated Message Handling System
• PE — Polyethylene
• PRF — Pulse Repetition Frequency
• NNTP — Network News Transfer Protocol
• CFD — computational fluid dynamics
• EMS — Express Mail Service
• ADT — Abstract Data Type
• ESF — Extended Super Frame (ATM)
• EC — European Community
• NIC — Network Information Center
• VOC — Volatile Organic Compounds (air pollution)
• VTC — Video Teleconference
• URI — Uniform Resource Identifier
• QI — Quality Improvement
• MIT — Massachusetts Institute of Technology (U.S.)
• JSC — Johnson Space Center (Houston, TX)
• WLAN — Wireless Local Area Network
• IRDA — Infrared Data Association
• ANI — Automatic Number Identification (Caller ID)
• TB — Terabyte
• BJT — Bipolar Junction Transistor
• VB — Visual Basic
• BUR — Bandwidth Usage Redundancy
• BPRZ — Bipolar Return-to-Zero
• RFS — Request For Service
• DTX — Discontinuous Transmission
• MDA — Monochrome Display Adapter
• DSA — Directory System Agent
• FTTB — Fiber To The Building
• PAR — Precision Approach Radar
• AU — Audio Unit
• MDA — Model Driven Architecture
• AS — Autonomous System
• PKI — Public Key Infrastructure (cryptography)
• RCU — Remote Control Unit

• CDR — Call-Detail Record
• SPC — Stored Program Control
• VIRUS — Vital Information Resources Under Siege
• DSN — Deep Space Network - network of large antennas and communication facilities.
• ASK — amplitude shift keying
• DSCP — Differentiated Services Control Point
• BAN — Base Area Network
• OD — Outside Diameter
• ADP — Automatic Data Processor
• GRE — Generic Routing Encapsulation
• CFE — Contractor-Furnished Equipment
• ADM — Add/Drop Multiplexer
• RH — Relative Humidity
• NMS — Network Management System
• ADCCP — Advanced Data Communications Control Procedures
• CMC — Career Management Center
• EHF — Extremely High Frequency
• SP — Service Provider
• CERT — Computer Emergency Response Team
• ADF — Automatic Direction Finder
• STA — State
• TRLR — Trailer
• HSD — High Speed Data
• RSVP — Resource Reservation Protocol (Internet)
• BOC — Bell Operating Company
• ATF — Advanced Tactical Fighter
• UML — Unified Modeling Language (Object Management Group, OMG)
• IMSI — International Mobile Subscriber Identity
• 3G — Third Generation mobile phone network
• ODBC — Open Database Connectivity
• IMEI — International Mobile Equipment Identity
• CRBT — Caller Ring Back Tone
• STM — Short Term Memory
• APS — Automatic Protection Switching (SONET/SDH)
• CIC — Circuit Identification Code
• NIS — Network Information Service
• ISRO — Indian Space Research Organisation
• MPEG — Motion Picture Experts Group
• APC — American Power Conversion
• LPE — Liquid Phase Epitaxy
• TDMA — Time Division Multiple Access
• COMINT — Communications Intelligence
• SMI — Structure of Management Information
• NAS — Network Access Server
• DOT — Department of Telecommunications (India)
• TPDU — Transport Protocol Data Unit
• PDS — Protected Distribution System
• FAX — Facsimile
• RAN — Radio Access Network
• FEC — Forward Error Correction

• NCS — National Communications System
• YABA — Yet Another Bloody Acronym
• MVS — Multiple Virtual Storage
• YAHOO — You Are Hazy Over Oranges
• TKIP — Temporal Key Integrity Protocol
• RSVD — Reserved
• NFPA — National Fire Protection Association
• RARP — Reverse Address Resolution Protocol
• BECN — Backward Explicit Congestion Notification
• IPX — Internetwork Packet Exchange
• CGM — Computer Graphics Metafile
• DCMI — Dublin Core Metadata Initiative (Online Computer Library Center)
• LZ — Landing Zone
• MTU — Maximum Transmission Unit
• TOS — Type Of Service
• BS — Base Station
• WPM — speech--words per minute
• MOS — Model Output Statistics
• NSAI — National Standards Authority of Ireland
• RDF — Radio Direction Finder
• TTY — Teletype Telex Machine
• CGI — Computer-Generated Imagery
• SML/SMS — Service Management Layer/Service Management Service
• TTYL — Type To You Later
• ATM — Adobe Type Manager
• WPAN — Wireless Personal Area Network
• BLOS — Beyond Line-Of-Sight
• DTR — Data Terminal Ready
• AXE 10 — Series of electronic telephone exchanges from L.M. Ericsson
• ELT — Emergency Locator Transmitter
• VXML — Voice eXtensible Markup Language
• CATV — Cable Television
• FR — Frame Relay
• SAR — synthetic aperture radar (satellite)
• LR-WPAN — Low-Rate Wireless Personal Area Network
• CC — Country Code
• ARG — Argument
• UA — User Agent
• MPLS — Multi Protocol Label Switching
• SAR — Specific Absorption Rate
• DID — direct inward dial
• VCC — Virtual Channel Connection (ATM)
• AEW — Airborne Early Warning
• CA — Certificate Authority
• PCI — Peripheral Component Interconnect
• B-ISDN — Broadband Integrated Services Digital Network
• ASTD — American Society of Training and Development (Alexandria, Virginia)
• SIL — Speech Interference Level
• PWD — Password
• DIT — Directory Information Tree

• EEA — European Economic Area
• KDC — Kerberos Key Distribution Center
• MS — Mobile Station
• BPDU — Bridge Protocol Data Unit
• VAS — Value Added Services
• MIC — Message Integrity Check
• CPS — characters per second
• ESTEC — European Space Research and Technology Centre
• WK — Week
• MTSO — Mobile Telephone Switching Office
• EGP — Exterior Gateway Protocol
• IS — International Standard
• NLM — National Library of Medicine (National Institutes of Health)
• PAN — Personal Area Network
• FCA — Free Carrier Absorption
• SRS — Software Requirements Specifications
• COM — Component Object Model
• SHF — Super High Frequency
• SW — South West
• ARIN — American Registry for Internet Numbers
• OTN — Optical Transport Network
• MIS — Management Information Service
• LQC — Line Quality Control
• IS — Intermediate System
• ECN — Explicit Congestion Notification
• YP — Yellow Pages
• SCTP — Stream Control Transmission Protocol
• DUP — Duplicate
• CIFS — Common Internet File System
• SKU — Stockkeeping Unit
• LCN — Logical Channel Number
• ITT — Invitation To Tender
• ASR — Automatic Speech Recognition
• SIT — Static Induction Transistor
• ACO — Additional Call Offering
• TG — Task Group
• FTTH — Fiber To The Home
• HSS — Home Subscriber Server
• ASIC — application-specific integration circuit
• DDN — U.S. Defense Data Network
• EPR — Electron Paramagnetic Resonance
• OMA — Open Mobile Alliance
• ARQ — Automatic Repeat-reQuest
• CPS — Cycles Per Second (now Hertz)
• NTP — Network Time Protocol
• OSTP — Office of Science and Technology Policy
• IV — Initialization Vector
• PDN — Packet Data Network
• AR — Access Rate
• NMT — Nordic Mobile Telephone

• B3ZS — bipolar 3-zero substitution
• RCC — Rescue Coordination Center
• ACAP — Application Configuration Access Protocol
• BBU — Baseband Unit
• FAT — File Allocation Table
• CBEMA — Computer & Business Equipment Manufacturers Association
• GOS — Grade Of Service
• RSS — Really Simple Syndication
• ORB — Object Request Broker
• ES — Errored Second
• APM — Advanced Power Management
• UAS — Unavailable Seconds
• IW — Information Warfare
• DLC — Digital Loop Carrier
• MCC — Mission Control Center (JSC)
• 3GPP — Third Generation Partnership Project
• ISA — Industry Standard Architecture
• RCV — Receive
• TM — Technical Manual
• VMS — Virtual Memory System
• CATV — Community Antenna Television
• MS — Message Store
• MSU — Microwave Sounding Unit
• APN — An Access Point Name
• AMI — Alternate Mark Inversion
• ADF — automatic document feeder
• SDLC — Synchronous Data Link Control
• CAUCE — Coalition Against Unsolicited Commercial Email
• IEEE-SA — Institute of Electrical and Electronics Engineers - Standards Association
• ADB — Apple Desktop Bus
• LLC — Logical Link Control
• NOTAM — Notice to Airmen
• LPC — Linear Predictive Coding
• VOD — Video On Demand
• DDCMP — Digital Data Communications Message Protocol
• PPARC — Particle Physics and Astronomy Research Council
• NOAO — National Optical Astronomy Observatories (Tucson, AZ)
• FCP — Fibre Channel Protocol
• QPSK — aeronautical quadrature phase shift keying
• MS — Management System
• BER — Basic Encoding Rules (ASN.1)
• LIU — Line Interface Unit
• DDS — Digital Data Service
• VSAT — Very Small Aperture Terminal (satellite service)
• PAP — Password Authentication Protocol (ATM)
• CDE — Common Desktop Environment
• ABBR — Abbreviation
• MCSD — Microsoft Certified Solution Developer
• CAV — Constant Angular Velocity
• OAS — Organization of American States

• MHS — Microwave Humidity Sounder
• RCS — Radar Cross Section
• DCS — Digital Cross-connect System
• ISO — Infrared Space Observatory
• DCE — Data Communication Equipment
• AWACS — Airborne Warning And Control System
• NE — North-East
• CICS — Customer Information Control System (IBM Mainframe Software; Kicks Or C-I-C-S)
• SEM — Space Environment Monitor
• CTS — Clear To Send
• EULA — End User License Agreement (usually in reference to software)
• PDC — Personal Digital Cellular
• UL — Uplink
• IIS — Internet Information Services
• NTFS — New Technology File System
• PLMN — Public Land Mobile Network
• TIA — Telecommunications Industry Association
• E — Echo Time Zone
• OLAP — Online Analytical Processing
• DAT — Digital Audio Tape
• TCSEC — Trusted Computer System Evaluation Criteria
• HSCSD — High-Speed Circuit-Switched Data
• DA — Destination Address
• JIS — Japanese Industrial Standard
• VLSI — Very-Large-Scale Integration
• FC — Fibre Channel
• ESS — Electronic Switching System
• 100BASE-T4 — 100 Megabits per Second, Baseband, Four-pair Category 3 UTP cables
• CS — Cable Select
• ARINC — Aeronautical Radio Incorporated
• AFOSR — Air Force Office Of Scientific Research(USA)
• ECM — Electronic Counter Measures
• VGA — Video Graphics Array
• EMR — Electromagnetic Radiation
• ISO — Independent System Operator (US) (see also TSO) Responsible for grid management, but does not own assets. (electricity)
• DTD — Document Type Definition (XML)
• CCTA — Central Computer and Telecommunications Agency
• BERT — Bit Error Rate Tester (telecommunication)
• BT — BlueTooth
• VM — Virtual Machine
• NREN — National Research and Education Network
• SLF — Super Low Frequency
• SSM — Source-Specific Multicast
• SDP — Session Description Protocol
• ATSR — Along-Track Scanning Radiometer
• WS — Workstation
• FEP — Front End Processor
• BIU — Bus Interface Unit
• DVMRP — Distance Vector Multicast Routing Protocol
• STP — Spanning Tree Protocol

• ME — Mobile Equipment
• SONET — Synchronous Optical Network
• CU — Channel Unit
• SDM — Service Delivery Management
• DPC — Destination Point Code
• ASI — Asynchronous Serial Interface
• DMTS — Distinguished Member Of Technical Staff
• DAP — Directory Access Protocol
• ACFQ — Absence Compensation Fair Queuing
• AFS — Andrew File System
• CFA — Carrier Facility Assignment
• WCDMA — Wideband Code Division Multiple Access
• OTA — Office of Technology Assessment (U.S.; abolished by Congress, Fall 1995)
• MCA — Micro Channel Architecture
• RTS — Request To Send
• TO — Technical Order
• 1000BASE-T — 1000 Megabits per Second, Baseband, Twisted Pair
• PROM — Programmable Read-Only Memory
• PTP — Point to Point Transmission Service (electricity)
• IRQ — Interrupt Request
• VRML — Virtual Reality Modeling Language
• DNIS — Dialed Number Identification Service
• TWT — Traveling Wave Tube
• SXS — Step-By-Step
• EAC — Engineering Accreditation Commission
• VF — Voice Frequency
• CSA — Canadian Standards Association (like UL)
• LLU — Local Loop Unbundling
• SMDS — Switched Multimegabit Data Service (ATM)
• DID — data item description
• RT — Radiotelephone
• NCP — Network Control Protocol
• CBR — Constant Bit Rate
• FMC — Fixed Mobile Convergence "Mobile UC or Unified Communications over Wireless"
• OSS — Operations Support System
• BRA — Basic Rate Access
• MCU — Multipoint Control Unit
• TE — Traffic Engineering
• GBPS — Gigabits per second
• CCIS — Common Channel Interoffice Signaling
• AFM — Atomic Force Microscopy
• JTF — Joint Task Force
• CAB — Conformity Assessment Body
• JCL — Job Control Language
• IAB — Internet Architecture Board
• DX — Duplex
• AOI — Area Of Interest
• ACR — Attenuation Crosstalk Ratio
• DSS — Digital Signature Standard
• AIFF — Audio Interchange File Format

• BS — Beam Splitter
• CAL — Calorie
• MMB — Middle Mouse Button
• POE — power over ethernetinjector
• EPABX — Electronic Private Automatic Branch Exchange
• TOP — Technical Office Protocol
• SYM — Symmetric
• ISOC — Internet Society
• TDM — Time Division Multiplexer
• EX — Exercise
• SMB — Server Message Block
• OAM&P — Operations, Administration, Maintenance & Provisioning
• CIM — Corporate Information Management
• AMR — Automated meter reading also known as Automatic Meter Reading
• ISI — Inter-Symbol Interference
• DSLAM — Digital Subscriber Line Access Multiplexer (Module)
• TOA — Time Of Arrival
• MSRN — Mobile Station Roaming Number
• SLP — Service Location Protocol
• TFTP — Trivial File Transfer Protocol (ATM)
• TAC — Technical Assistance Center
• MME — Mobility Management Entity
• IMC — Intermediate Metal Conduit
• LISP — List Processing Language
• CAM — Computer-Aided Mapping
• CF — Compact Flash
• COAX — Coaxial
• EMCON — Electromagnetic Emission Control
• IV&V — independent verification and validation
• JDK — Java Development Kit
• NE — Network Element
• FCW — Federal Computer Week
• ABN — Abnormal
• SOS — Save Our Souls (Help!)
• PIM — Personal Information Manager
• E — Energy
• TEC — Total Electron Content
• CDA — Command and Data Acquisition
• DSN — Defense Switched Network
• SVC — Scalable Video Coding
• AP — access point
• SVC — Switched Virtual Circuit (ATM)
• TE — Terminal Equipment
• AMPS — Advanced Mobile Phone System
• DS — Digital Signal
• ADEOS — ADvanced Earth Observing Satellite (Japan)
• EIA — Extended Interaction Amplifier
• VDS — Variable Depth Sonar
• MAJ — Major
• VLL — Virtual Leased Line

• CAN — Campus Area Network
• OC — Optical Carrier
• DCS — Data Collection System (NOAA Polar Orbiting Satellites)
• VC — Virtual Channel
• ADL — Advanced Distributed Learning
• RMI — Remote Method Invocation
• OSF — Open Software Foundation
• WTLS — Wireless Transport Layer Security
• SA — Scientific American
• EMS — Enhanced Messaging Service
• FXO — Foreign Exchange Office
• MMSI — Maritime Mobile Service Identity
• HLR — Home Location Register
• CBDS — Connectionless Broadband Data Service
• DIS — Distributed Interactive Simulation
• DT — DWDM (Dense Wavelength Division Multiplexing) Terminal
• JRE — Java Runtime Environment
• TDOA — Time Difference Of Arrival
• DISA — U.S. Defense Information Systems Agency
• RX — Receive
• EIGRP — Enhanced Interior Gateway Routing Protocol
• DIBL — Drain-induced Barrier Lowering
• RSRQ — Reference Signal Received Quality
• SPA — Special Prorate Agreement
• ZIP — Zone Information Protocol
• ARPU — Average Revenue Per User
• DBS — Direct Broadcast Satellite
• BACP — Bandwidth Allocation Control Protocol
• ERP — Enterprise Resource Management
• WMAN — Wireless Metropolitan Area Network
• ASE — Application Service Element
• ECPA — Electronic Communications Privacy Act 1986
• CAC — Connection Admission Control (Asynchronous Transfer Mode)
• CABS — Carrier Access Billing System
• CO — Central Office
• SM — Senior Member
• NCSC — National Computer Security Center (NSA)
• NI — Network Interface
• NAT — Network Address Translation
• TPC — The Phone Company
• EMS — Element Management System (ATM)
• RADIUS — Remote Authentication Dial-In User Service
• AMLCD — Active Matrix Liquid Crystal Display
• LSR — Local Service Request
• ATS — Automatic Transfer Switch
• DMS — Data Management System
• SPGA — Staggered Pin Grid Array
• WINS — Windows Internet Name Service
• WAR — Weekly Activity Report
• IMPACT — Integrated Manufacturing Precision Assembly Cellular Technology

• LT — Line Termination
• FSK — Frequency-Shift Keying
• DIS — Draft International Standard
• TIFF — Tag Image File Format
• DUA — Directory User Agent
• IEEE-CS — Institute of Electrical and Electronics Engineers Computer Society
• SNA — System Network Architecture
• COO — Cost of Ownership
• AT — Access Tandem
• MCP — Microsoft Certified Professional
• RPV — Remotely Piloted Vehicle
• NRPB — National Radiological Protection Board
• 10BASE-T — 10 Megabits per second, Baseband, Twisted pair
• NDVI — Normalized Difference Vegetation Index
• BNC — Bayonet Neill-Concelman
• SBC — Session Border Controller
• EBCDIC — Extended Binary-Coded Decimal Interchange Code
• CDS — Cell Directory Service
• ECAC — European Civil Aviation Conference
• DII — Defense Information Infrastructure
• DN — Distinguished Name
• SAA — Systems Application Architecture
• VBA — Visual BASIC for Applications
• POP — Post Office Protocol
• CCIR — International Radio Consultative Committee (French Acronym)
• STI — Speech Transmission Index
• OTS — Optical Transmission Section
• NCAR — National Center for Atmospheric Research (US)
• RJ-14 — Registered Jack type 14 (2-wire connector)
• TDD — Telecommunications Device for the Deaf
• F — Fellow
• COMJAM — Communications Jamming
• DNIC — Data Network Identification Code
• VHSIC — Very High-Speed Integrated Circuit
• LSF — Line Spread Function
• CEV — Controlled Environment Vault
• FITS — Flexible Image Transport System
• UTP — unshielded twisted pair
• HEX — Hexadecimal (base 16)
• NSS — Network Switching Subsystem
• OMS — Optical Multiplex Section
• ROSAT — Roentgen Satellite
• LRC — Learning Resource Center
• 4GL — Fourth-Generation Language
• IS — Information System
• AAS — Adaptive Antenna System
• FAA — Federal Aviation Agency
• ASN.1 — Abstract Syntax Notation One
• AFSK — Audio Frequency Shift Keying
• CAVE — Cellular Authentication and Voice Encryption Algorithm

• QI — Quality Indicator
• TDRSS — Tracking and Data Relay Satellite System
• FE — Finite Element
• E2E — End-to-End
• DEMUX — Demultiplexer
• HDSL — High-bit-rate Digital Subscriber Line
• CVD — Chemical Vapor Deposition
• LEP — Large Electron Positron
• RP — Reference Point
• TCPA — Telephone Consumer Protection Act
• AAF — Advanced Authoring Format
• WLTF — Wireless LAN (Local Area Network) Task Force
• DRFM — Digital Radio-Frequency Memory
• CRO — Central Records Office
• PEM — Privacy-Enhanced Mail
• FTAM — File Transfer Access and Management
• RJ-25 — Registered Jack type 25 (6-wire connector)
• SVD — Singular Value Decomposition
• BTAM — Basic Telecommunications Access Method
• CAC — Carrier Access Code
• IRTF — Internet Research Task Force
• VPI — Virtual Path Identifier
• MHO — My Humble Opinion
• VT — Virtual Terminal
• WWAN — wireless wide-area network
• FH — Frequency Hopping
• SITA — Société Internationale de Télécommunications Aéronautiques
• TDD — Time Division Duplex
• AAV — Accountholder Authentication Value
• DUC — Digital Up-Converter
• ECT — Explicit Call Transfer
• BELLCORE — Bell Communications Research, Inc.
• CAMA — Centralized Automatic Message Accounting
• SMPTE — Society of Motion Picture and Television Engineers, Inc.
• 2W — Two Wire
• TTL — ToS and Time-to-Live
• PM — Phase Modulation
• VESA — Video Electronics Standards Association
• OOP — Object-Oriented Programming
• DSCP — Differentiated Services Code Point
• LNP — Local Number Portability
• IESG — Internet Engineering Steering Group
• BSI — British Standards Institution
• SAN — System Area Network
• ACF — Access Control Field
• DMX — De-MultipleXer
• GDS — Global Distribution System
• NSAP — Network Service Access Point
• ECP — Encryption Control Protocol
• TRMM — Tropical Rainfall Measuring Mission (US-Japan)

• CODASYL — COnference on DAta SYstems Languages
• CO — Certificate of Origin
• TOVS — TIROS Operational Vertical Sounder
• P — Predicted
• EFS — Encrypting File System
• WAFB — Wireless Absolute Fairness Bound
• IN — Intelligent Network
• EMI — Electro-Magnetic Interference
• COPS — Common Open Policy Service
• SD — Software Development
• RACH — Random Access Channel
• KAK — Key-Auto-Key
• MSR — Microwave Scanning Radiometer
• LFACS — Loop Facility Assignment and Control System
• STK — Satellite Tool Kit
• NII — National Information Infrastructure (USA)
• BOD — Bandwidth on Demand
• WAIS — Wide Area Information Server
• VLAN — Virtual Local Area Network
• TLC — The Learning Channel
• FEP — Front-End Processor
• SA — Source Address
• F — Frequency
• STN — Station
• NW — North West
• TXM — Transmission X-ray Microscope
• PGA — Programmable Gate Array
• IEEE — Institute of Electrical and Electronics Engineers
• IRS — Inertial Reference System
• EST — Establish
• AIN — Advanced Intelligent Network
• PNP — Plug-and-Play
• PSN — Packet Switched Network
• AUI — Attachment Unit Interface
• BAOC — Barring of All Outgoing Calls supplementary service
• NIU — Network Interface Unit
• CODEC — Coder/decoder
• BHCA — Busy Hour Call Attempt
• SIP — Session Initiation Protocol
• LATA — Local Access and Transport Area
• AML — Amplitude Modulated Link
• NLMS — Normalized Least Mean Square
• SUS — Suspension
• LRC — Longitudinal Redundancy Check
• LU — Logical Unit
• TCP/IP — Transmission Control/Internet Protocol
• AUD — Audit
• SDP — Software Development Plan
• PVD — Physical Vapor Deposition
• TS — Technical Specification

• DW — Deep Water
• QDR — Quad Data Rate
• SPI — Service Provider Interface
• CPN — Cisco Powered Network
• AFP — AppleTalk Filing Protocol
• RGN — Region
• TOMS — Total Ozone Mapping Spectrometer (satellite Instrument)
• PUK — PIN (Personal Identification Number) Unlocking Key
• SDSL — Symmetric Digital Subscriber Line
• RISC — Reduced Instruction Set Computing
• T — Temperature
• CTU — Central Terminal Unit
• ASR — Access Service Request
• DER — Distinguished Encoding Rules
• ISM — Industrial, Scientific and Medical
• IDT — Integrated Digital Terminal
• FEXT — Far-End Cross Talk
• ASAR — Advanced Synthetic Aperture Radar 
• LSI — Large Scale Integration -> VLSI
• DAL — Dedicated Access Line
• NAS — Network-Attached Storage
• LQR — Linear Quadratic Regulator
• DPSK — Differential Phase Shift Keying
• SATAN — Security Administrator Tool for Analyzing Networks
• ETSI — European Telecommunications Standard Institute
• ADT — American District Telegraph Company
• CLNP — ConnectionLess-mode Network Protocol
• WWAN — Wireless Wide Area Network
• IRLAN — Infrared LAN
• CBP — Coded Block Pattern
• ETS — European Telecommunication Standard
• RRN — Routing Recording Number
• CMOS — Complementary Metal Oxide Semiconductors
• GDM — GSM (Global System for Mobile communications) Data Module
• LPD — Low Probability of Detection
• AF — Assured Forwarding
• RDI — Remote Defect Indicator (UNI Fault Management)
• E&M — ear and mouth (special signaling leads)
• FWA — Fixed Wireless Access
• 1FB — Single line, Flat Business rate;
• IPR — Intellectual Property Right
• LDP — Label Distribution Protocol
• CRLF — Carriage-Return Line-Feed
• FDD — Frequency Division Duplex
• WHT — Walsh-Hadamard Transform
• TCR — Temperature Coefficient of Resistance
• NCC — Network Control Center (GSFC)
• SPADATS — Space Detection And Tracking System
• BIS — Business Information System
• SWBD — Switchboard

• BLER — Block Error Rate
• B2B — Business-to-Business
• AMSS — Automatic Message Switching System
• ITP — Interactive Telecommunications Program
• IAD — Integrated Access Device
• MTP — Message Transfer Part
• RSS — root-sum-square
• COMDEX — Computer Dealers Exposition
• UAN — Universal Access Number
• BMEWS — Ballistic Missile Early Warning System (bee-mews)
• MSE — Mobile Subscriber Equipment
• ESP — Encapsulating Security Payload
• MC — Message Center
• M — Management
• FR PVC — Frame Relay Permanent Virtual Connection
• GSM — Groupe Speciale Mobile
• PAL — Programmable Array Logic
• PUB — Publication (file name extension)
• DVB — Digital Video Broadcasting
• ASYNC — Asynchronous
• Y — Yes
• CC — Call Control
• ASA — Acoustical Society of America
• IPOATM — Internet Protocol over ATM
• PIC — Programmable Interrupt Controller
• HEHO — Head End Hop Off
• CSAT — Customer Satisfaction
• SPD — Serial Presence Detect
• CAM — Computer-Aided Manufacturing
• ACF — Advanced Communications Function (IBM)
• CAPS — Call Attempts Per Second
• FSK — Frequency Shift Keying
• ACSE — Association Control Service Element
• FUP — Fair Use Policy
• PSD — Phase-Sensitive Detector
• Y — Yttrium
• DTU — Data Transfer Unit
• PTA — Pakistan Telecommunication Authority
• SINAD — SIgnal-to-(Noise And Distortion) ratio
• SLIP — Serial Line Internet Protocol
• ESCA — photoelectron spectroscopy for chemical analysis
• LEN — Line Equipment Number
• BDE — Borland Database Engine
• IPCP — Internet Protocol Control Protocol
• YA — Yet Another
• FECN — Forward Explicit Congestion Notification (ATM)
• DCS — Digital Cross-Connect
• NPA — Numbering Plan Area
• ODS — Operational Data Store (knowledge management)
• BY — Busy

• UMA — Unlicensed Mobile Access
• MX — Mixer
• TM — Thematic Mapper (Landsat)
• TBD — To Be Decided
• RAU — Radio Access Unit (Army)
• ASARS — Advanced Synthetic Aperture Radar System
• MLP — Mobile Location Protocol
• 4 GIG — 4 Giga Intellectual Gadget
• TDR — Time-Domain Reflectometry
• REA — Rural Electrification Administration (US)
• MD — Mediation Device
• CSU — Channel Service Unit
• VCI — Virtual Channel Identifier
• CMIP — Common Management Information Protocol (ATM)
• VQV — Voice Quality Value
• RMON — Remote Monitoring
• SPA — Software Publishers Association
• DL — Downlink Message
• VTS — Vessel Traffic Service
• CSPDN — Circuit Switched Public Data Network
• WARC — World Administrative Radio Conference
• PIC — Peripheral Interface Controller
• TI — Time Interval
• RIPE NCC — Reseaux IP Europeens Network Coordination Centre
• SDHLR — Super-Distributed Home Location Register
• PU — Physical Unit (IBM)
• MSC — Mobile Switching Center
• CP — Change Proposal
• BCH — Binary Coded Hexadecimal
• OBC — Onboard Computer
• ESF — Edge Spread Function
• FIOS — Fiber Optic Services
• CT — Computer Telephony
• CFNRY — Call Forwarding on No Reply
• MPI — Message Passing Interface
• NES — Network Encryption System
• DMI — Desktop Management Interface (computing)
• TTY — teletype terminal
• HW — Hardware Wars
• GMRS — General Mobile Radio Service
• MMC — Microsoft Management Console (Microsoft)
• ACLR — Adjacent Channel Leakage Ratio
• DCN — Disconnect
• W-CDMA — Wideband Code Division Multiple Access
• YYP — Yahoo Yellow Pages
• CLDC — Connected Limited Device Configuration
• SCPC — single channel per carrier
• ACT — Activity
• OT — Office of Telecommunications
• SLAM — Scanning Laser Acoustic Microscope

• DCP — Design Change Package
• DMARC — Demarcation point
• IPLC — International Private Leased Circuit
• MTA — Message Transfer Agents (Internet)
• LIS — Lightning Imaging Sensor
• EFIS — Electronic Flight Information System
• DTMF — Dual-Tone MultiFrequency
• FLM — First Line Maintenance
• DIV — Divisionsion
• IP — Intelligent Peripheral
• RJE — Remote Job Entry
• ARC — Army Reuse Center
• TN — Telephone Number
• CLEC — Competitive Local Exchange Carrier
• RDBMS — Relational Data Base Management System (Oracle)
• BAN — Billing Account Number
• TOP — technical/office protocol
• SM OFC — Single-Mode Optical Fiber Cable
• B6ZS — Bipolar 6 Zero Substitution
• FEM — Finite Element Method
• PAM — Payload Assist Module
• LSW — Least Significant Word
• STM — Scanning Tunneling Microscopy
• SZ — Seizure
• NAK — Negative Acknowledge
• SWAP — Shared Wireless Access Protocol
• IMAP — Internet Mail Access Protocol
• CHTML — Compact Hypertext Markup Language
• STP — Signal Transfer Point
• SG — Signaling Gateway (IETF)
• LAG — Link Aggregation Group
• WSDL — Web Services Description Language
• DCS — Defense Communications System
• UART — Universal Asynchronous Receiver/Transmitter
• RADINT — Radar Intelligence
• FOSE — Federal Office Systems Exposition
• MUSIC — MUltiple SIgnal Classification
• S/N — Signal-to-Noise ratio
• XPS — X-Ray Photoelectron Spectroscopy
• EAS — Extended Area Service
• CPE — Customer Premise Equipment
• DLCI — data link connection identifier
• PP — Polypropylene
• SCP — Service Control Point
• PTT — Push to Talk Testing
• SML — Service Management Layer
• DAC — Digital-To-Analog Converter
• CES — Circuit Emulation Service
• FDTD — Finite Difference Time Domain
• NLM — NetWare Loadable Module

• LAAS — Local Area Augmentation System
• CD — Critical Dimension
• LCR — Least Cost Routing
• ATC — Advanced Technology Center
• TRM — Technical Reference Model
• IEC — Interexchange Carrier
• CIRC — Cross-Interleaved Reed-Solomon Code
• 1-ESS — x-ESS series of Electronic Switching Systems
• TOS — Temporarily Out of Service
• HFC — Hybrid Fiber Coaxial
• SFX — Special Effects
• FA — Functional Area
• BIP — Band Interleaved by Pixel
• VOP — Voice Over Packet
• COAM — Customer Owned And Maintained
• DISN — Defense Information Systems Network
• KSU — Key Service Unit
• CAM — Content Addressable Memory
• AAS — advanced automation system (FAA)
• ERL — Echo Return Loss
• NT — New Technology, also Windows NT
• EIR — Excess Information Rate
• RECON — Reconnaissance
• SSMA — Spread-Spectrum Multiple Access
• TMSI — Temporary Mobile Subscriber Identity
• STN — Station Casinos, Inc.
• EIP — Equipment installation procedure
• PSN — Public Switched Network
• DID — Digital Information Display
• TACACS — Terminal Access Controller Access Control System
• ESN — Electronic Serial Number
• SSAP — Source Service Access Point
• NIC — Network Interface Controller
• FRAD — Frame Relay Access Device
• 2G — Second Generation Wireless Systems
• TC — Transmission Convergence (ATM)
• NDIS — Network Driver Interface Specification (Microsoft Windows NT)
• AC — Area Code
• DAS — Data Acquisition System
• MEAS — Measure
• AMPS — Advanced Mobile Phone Service (cellular phone standard)
• CAR — committed access rate
• ESPN — Entertainment and Sports Programming Network
• DPCM — differential pulse code modulation
• FAS — Frame Alignment Signal
• URN — Uniform Resource Namespace
• PWM — Pulse width modulation
• FE — Far End
• SIMT — Système interbancaire marocain de télécompensation
• SR — Slow Release

• DUV — Deep Ultraviolet
• 4G — Fourth Generation Wireless Systems
• FCA — Free Carrier Alongside
• UMTS — Universal Mobile Telecommunication System
• GTP — GPRS (General Packet Radio Service) Tunneling Protocol
• SVC — Switched Virtual Connection
• SEM — Scanning Electron Microscopes
• STU — Secure Telephone Unit
• ES — Emergency Service
• CIP — Continuous Improvement Program
• PARC — Palo Alto Research Center
• TL1 — Transaction Language 1
• SCN — Switched Circuit Network
• A — Anode
• BUFR — Binary Universal Form for the Representation (of data)
• IPS — InPlane Switching
• AN — Access Node
• JAN — Joint Army-Navy
• TE — Test Equipment
• CI — Common Interface
• TRS — Trunked Radio Systems
• CDDI — Copper Distributed Data Interface
• DEM — Digital Elevation Model
• CSPRM — Common Signaling Protocols Resource Module
• CMT — Cadmium Mercury Telluride
• VTAM — Virtual Telecommunication Access Method
• PG — Page
• ACC — Area Control Center
• RLU — Remote Line Unit
• TSO — Telecommunications Service Order
• MEID — Mobile Equipment Identifier
• NTDS — Naval Tactical Data System
• FEA — Finite Element Analysis
• MSI — Maritime Safety Information
• TELECOMMUTE — Telecommuting
• BTC — Botswana Telecommunications Corporation
• IWF — Interworking Function
• DS-0 — Digital Signal, Level 0
• DICOM — Digital Imaging and Communications in Medicine
• NCP — Network Control Program
• PTT — Push to Talk Technology
• PBT — Polybutylene Terephthalate
• DVP — Digital Voice Privacy
• PTO — U.S. Patent And Trademark Office
• CDR — Clock and Data Recovery
• 4W — Four-Wire
• ROW — Rest Of World
• WAAS — Wide Area Augmentation System
• BCDIC — Binary Coded Decimal Interchange Code
• MP — Multilink Protocol

• AMA — automatic message accounting
• OPC — Originating Point Code
• TCM — Trellis-Coded Modulation
• CLETS — California Law Enforcement Telecommunication System
• EMEA — Europe, Middle East and Africa
• PDS — Planetary Data System
• UPT — Universal Personal Telecommunications
• SRR — Search and Rescue Region
• PDT — Portable Data Terminal
• IPS — Instructions Per Second
• VLSI — Very Large-Scale Integration
• SIM — Subscriber Identity Module
• DMT — Discrete Multi-Tone Technology
• RSS — Radio Service Software (Motorola)
• ADPCM — Adaptive Differential Pulse Code Modulation
• PRI — Priority
• LMDS — Local Multipoint Distribution Service
• HTML — Hyper-Text Markup Language
• NNM — Network Node Manager
• TCIC — Trunk Circuit Identification Code
• SPM — Scanning Probe Microscope
• RADARSAT — Radar Satellite
• CER — Cell Error Ratio
• RMS — Resource Management System
• STM — Synchronous Transfer Mode
• MGC — Multimedia Gateway Controller
• ATS — Air Traffic Services
• NTU — Network Termination Unit
• FTNS — Fixed Telecommunications Network Services
• RT — Remote Terminal
• PHY — Physical Layer
• CCNA — Cisco Certified Network Administrator
• RCC — Radio Common Carrier
• AFI — Authority and Format Identifier
• TELNET — Telecommunications Network Protocol
• L2TPV3 — Layer 2 Tunneling Protocol Version 3
• LT — Less Than
• EBS — Electron Bombarded Silicon
• SPE — Synchronous Payload Envelope
• CAAS — Communications-as-a-Service
• GI — Graded-Index
• ER — Extended Range
• DLP — Data Link Processor
• ST — Such That
• VSAM — Virtual Storage Access Method
• MTI — Moving Target Indicator
• DA — deca
• HSPA — High Speed Packet Access
• SIL — Solid Immersion Lens
• BCH — Bose-Chaudhuri-Hocquenghem Coding

• PTT — Push to Talk Taster
• MILNET — Military Network
• CNM — Customer Network Management
• VAN — Value-Added Network
• EA — Extended Address Field Bit
• CNG — Fax Calling Tone
• RLS — Recursive Least Squares
• NWK — Network
• PUC — Public Utility Commission (electricity)
• CSIRO — Commonwealth Scientific and Industrial Research Organization
• WPS — Wireless Priority Service
• METRO — Metropolitan
• CGI — Cell Global Identity
• L2TP — Layer 2 Tunneling Protocol
• MTD — Moving Target Detection
• SM — Service Module
• DCS — Digital Cellular System
• VC — Virtual Circuit (ATM)
• MOL — Manned Orbiting Laboratory
• CALEA — Communications Assistance for Law Enforcement Act
• UBR — Unspecified Bit Rate
• CNG — comfort noise generation
• DL — Data Link
• TSR — Telecommunications Service Request
• NRP — Network Resource Planning
• RSN — Regional Service Network
• TLK — Talk
• 2G — Second generation cellular
• TC — Technical Committee (HL7)
• SA — Selective Availability (on GPS transmissions)
• RA — Risk Analysis
• MSW — Most Significant Word
• WSFL — Web Services Flow Language
• DPL — Digital Power Line
• NEMP — Nuclear Electromagnetic Pulse
• OTDOA — Observed Time Difference of Arrival
• DOCSIS — Data over Cable Service Interface Specification
• CDC — Connected Device Configuration
• PE — Probable Error
• STD — Secondary Telecom District
• RDMA — Remote Direct Memory Access
• CIAC — Computer Incident Advisory Capability
• NMC — Network Management Center
• NDS — Novell Directory Services
• TBPS — Terabits Per Second
• OWS — Operator Work Station
• PCS — Personal Communications Services
• RADIUS — Remote Authentication dial In User Service
• FITL — Fiber-In-The-Loop
• BBM — Blackberry Messenger

• ARSR — Air Route Surveillance Radar
• LUNT — Line Unit Network Termination
• PSK — Phase Shift Key
• IAT — Integrated Access Terminal
• NTSC — National Television Standards Committee
• CCITT — Comit? Consultatif International T?l?graphique et T?l?phonique
• ABM — Asynchronous Balanced Mode
• DPDU — Data Protocol Data Unit
• SPX — Sequenced Packet Exchange
• DL — Digital Library
• CPC — Calling Party Control
• ECS — Environmental Control System (Subsystem)
• LSAP — Link Service Access Point
• HFC — Hybrid Fiber/Coaxial network
• MBWA — Mobile Broadband Wireless Access
• ECM — Error Correction Model
• PTP — Point To point Protocol
• MAP — Mobile Application Part
• TSP — Telecommunications Service Priority
• IDF — Independent Distribution Frame
• TTY — Text Teletype
• MRT — Medical Response Team
• Q — Quadrature
• ADN — Abbreviated Dialing Number
• DEC — Decimal
• DPL — Digital Private-Line
• ASDE — Airport Surface Detection Equipment
• EPP — Enhanced Parallel Port (PC)
• CTI — Computer Telephony Integration
• O/S — Operating System
• E — Electra
• UAT — Universal Access Transceiver
• CMRS — Commercial Mobile Radio Service
• SL — Single Line
• OSP — Outside Plant
• B3G — Beyond Third Generation
• VISSR — visible and infrared spin scan radiometer (GOES)
• FTS — Federal Telecommunications System
• TD-CDMA — Time Division - Code Division Multiple Access
• ENV — Environment
• MSDP — Multicast Source Discovery Protocol
• PLL — Phase Locked Loop
• NTE — Network Terminating Equipment
• MBMS — Multimedia Broadcast/Multicast Service
• SE — Southeast
• TUR — Trunk Utilization Report
• HDTV — High-Definition Television
• ARCNET — Attached Resource Computer Network
• FTTC — Fiber To The Curb光纤到路边
• SSM — Synchronization Status Message

• SISIR — Singapore Institute of Standards and Industrial Research
• EU — End User
• CB — Common Battery
• CP — Cell Phone
• ARPANET — ARPA Network
• SEC — Software Engineering Center
• SSRC — Synchronization Source
• CSC — Common Signaling Channel
• MOD — Modify
• CQA — Certified Quality Auditor
• MBE — Molecular Beam Epitaxy
• FIRST — Forum of Incident Response and Security Teams (CERT)
• QOI — Quality of Information
• MAU — Multistation Access Unit
• TDWR — Terminal Doppler Weather Radar
• RT — Response Time
• MFLOPS — Millions of Floating Point Operations per Second
• SAI — Serving Area Interface
• BSID — Base Station Identity
• CGA — Color Graphics Adapter
• DL — Definition List
• CLI — Calling Line Identification
• CSAR — Combat Search and Rescue
• JISC — Japanese Industrial Standards Committee
• CVR — Crystal Video Receiver
• DCA — Dynamic Channel Assignment
• ASN.1 — Abstract Syntax Notation 1
• 2W — 2-Wire
• C — Cost
• DGPT — Directorate General of Posts and Telecommunications
• LANE — Local Area Network Emulation
• MAG — Mobile Access Gateway
• ATSC — Advanced Television Systems Committee
• EIR — Equipment Identity Register
• ANS — Advanced Network Services
• VPWS — Virtual Private Wire Service
• PS — Product Specification
• SAR — Segmentation and Reassembly (ATM)
• MITI — Ministry of International Trade and Industry
• DF — Direction Finding or Finder
• O — objective
• APDU — Application Protocol Data Units
• VPA — Valid Peripheral Address
• CACM — Communications of the ACM
• LN — Line
• USRT — Universal Synchronous Receiver/Transmitter
• LBR — Low Bit Rate
• VT — Vacuum Tube
• PCI — Personal Computer Interface
• 3-D — 3-Dimensional

• SCH — Synchronization Channel
• SCR — Sustainable Cell Rate
• BUS — Broadcast and Unknown Server
• PNP — Positive-Negative-Positive
• OLS — Optical Line System
• ARM — Asynchronous Response Mode
• AIF — Audio Interchange Format
• PMP — Project Management Professional
• ANC — Access Network Controller
• EV — electronvolt
• MDM — Mobile Device Management
• SFN — Single Frequency Network
• LSI — Large-Scale Integration
• FEBE — Far End Block Error (SONET)
• AIT — Automatic Identification Technology
• FHSS — Frequency Hopping Spread Spectrum
• IRF — Impulse Response Function
• SDNS — Secure Data Network System
• MIDP — Mobile Information Device Profile
• L2F — Layer 2 Forwarding protocol
• ATA — Analog Telephone Adapter
• DDLD — Direct Dial Long Distance
• SCO — Synchronous Connection Oriented
• SIL — Silence
• NETBIOS — Network Basic Input-Output System
• BSS — Base Station Subsystem
• IOC — Inter-Office Channel
• DII — Dynamic Invocation Interface
• CASE — Computer-Aided Software Engineering
• GDK — GIMP (GNU Image Manipulation Program) Drawing Kit
• ARD — Automatic Ring Down
• DC — Display Controller
• DPNSS — Digital Private Network Signaling System
• MNP — Mobile Number Portability
• DUV — Data-Under-Voice
• BWD — backward
• ATCA — Advanced Telecom Computing Architecture
• TOU — Time of use (rate) (electricity)
• FRS — Frame Relay Service
• DMS — Defense Messaging System
• IPRC — Intellectual Property Rights Committee
• PIM — Protocol Independent Multicast
• 3G HSPA — Third-Generation High-Speed Packet Access
• VOA — Voice Of America
• MPI — Minimum Picture Interval
• UP — User Profile
• DFG — difference-frequency generation
• CGA — Carrier Group Alarm
• B8ZS — Binary Eight Zero Substitution
• PVC — Permanent Virtual Connection

• ATRAC — Adaptive Transform Acoustic Coding
• BSS — Basic Service Set
• DXI — Data Exchange Interface
• IS 41 — Interim Standard 41 (Inter-Cellular Network Communication Protocol)
• SMR — Specialized Mobile Radio
• DNU — Do Not Use
• WRED — Weighted Random Early Detection
• M/W — MicroWave
• MV — Motion Vector
• KTS — Key Telephone System
• TAD — Telephone Answering Device
• CALS — Computer Aided Acquisition and Logistic Support
• ETN — Electronic Tandem Network
• CS — Convergence Sublayer (ATM)
• XRF — X-Ray Fluorescence
• RLC — Radio Link Control
• FRS — Family Radio Service
• FDL — Facility Data Link
• FMS — Fraud Management System
• SF — Single Frequency
• CCLC — Carrier Common Line Charge
• DBRNC — deciBel Relative to Noise in a Circuit
• CCR — Customer Controlled Reconfiguration (Sprint)
• GBT — Ground Based Tower
• SRL — Singing Return Loss
• DDL — Digital Data Link
• CDV — Compressed Digital Video
• DACS — Digital Access Cross-connect System
• SCM — Single-Carrier Modulation
• FOIP — Fax Over Internet Protocol
• BABT — British Approvals Board for Telecommunications
• FCFS — First-Come, First-Served
• MC/MIC — Mode Common/Mode Indicate Common
• REPT — Report
• GSTN — General Switched Telephone Network
• BS — Broadcast Satellite
• TLT — Test Loop Translator
• CAP — Capability
• SMS — System Management Server
• IRC — International Record Carrier
• RDT — Remote Digital Terminal
• C — Collector
• XC — Cross-Connect
• OSCAR — Orbiting Satellite Carrying Amateur Radio
• BHCA — Busy Hour Call Attempts
• DQDB — Distributed Queue Dual Bus
• RM-ODP — Reference Model for Open Distributed Processing
• AECT — Association for Educational Communications and Technology's
• BSA — Basic Service Area
• BT — Bluetooth Tablet

• AM — Activity Manager
• SMT — station management (protocol)
• FAW — Frame Alignment Word
• LD — Laser Diode
• SS1 — Signalling System 1 (500/20 Hz tones)
• DMT — Discrete Multi-tone Transmission
• LCGN — Logical Channel Group Number
• FAT — Final Acceptance Testing
• PT — Payload Type (ATM)
• UNI — User-Network Interface
• IT — Integration Test
• VAD — Voice Activity Detection
• BIND — Berkeley Internet Name Domain
• OST — Office of Science and Technology
• TEI — Terminal Endpoint Identifier
• ISG — Information Systems Group
• WSP — Wireless Session Protocol
• PSNEXT — Power Sum Near End Cross Talk
• SH — Shell
• ALT — Accelerated Life Test
• SAF — System Access Fee
• DAC — Digital to Analog Converter-Audio
• CONUS — Contiguous United States
• GFC — Generic Flow Control (ATM)
• DFE — Design For Environment
• SCCP — Signalling Connection Control Part
• STD — Subscriber Trunk Dialing
• CDV — Cell Delay Variation(ATM)
• AS — Access System
• MOS — Metal Oxide Semiconductor (FET Devices)
• LASINT — Laser Intelligence
• DUN — Dial-Up Networking
• COT — Central Office Terminal
• BCS — British Computer Society
• RS-422 — Recommended Standard 422 (ANSI/EIA standard for transmitting serial data)
• FEAT — Feature
• MGCP — Multimedia Gateway Control Protocol
• SLBM — Submarine-launched ballistic missile
• EM — Electromigration
• WTP — Wireless Transaction Protocol
• MO — Magneto-optic
• SDU — Signal Distribution Unit
• DE — Discard Eligibility (ATM)
• NAU — Network Addressable Unit
• SRM — Scalable Reliable Multicast
• SPIN — Service Provider Identification Number
• SB — Switchboard
• LOO — Likelihood of Occurrence
• 3GSM — Third-generation Global System for Mobile (communications)
• ALB — Analog Loopback

• A/C — Air Conditioner
• EBIC — Electron Beam Induced Current
• ANSI-41 — ANSI standard for mobile management
• PY — person-year
• 3G — 3rd Generation Wireless Format
• CIS — Computer and Information Science
• NIMH — Nickel-Metal Hydride
• VNL — Via Net Loss
• S/D — Source/Drain
• NAM — Number Assignment Module
• DOR — Detailed Outage Report
• PLCP — Physical Layer Convergence Protocol (ATM)
• CGSA — Cellular Geographic Service Area
• EST — Electroshock Therapy
• ACP — Access Control Point
• SYSADM — System Administrator
• BONDING — Bandwidth On Demand Interoperability Group
• IXC — interexchange carrier
• BMS — Business Management System
• X — X Window System
• BSS — Base Station System
• DHD — Dial Home Device
• FIFO — first-in, first-out
• E — Echo
• TEL & TEL — TELephone and TELegraph
• BS — Backing Store
• INMS — Integrated Network Management System
• DSSSL — Document Style Semantics and Specification Language
• CLK — Clock
• OODBMS — Object-Oriented Database Management Systems
• COO — Cell of Origin
• OSA — Open System Architecture
• MAI — Multiple Access Interference
• SSM — Spread Spectrum Modulation
• SSU — Stratospheric Sounding Unit (TOVS)
• CCSA — Common Control Switching Arrangement
• VPX — Virtual Path Cross-Connect
• IPM — Inches Per Minute
• CRB — Cramer-Rao Bound
• BAN — Building Area Network
• ZD — Zero Defects
• TRS — Telecommunications Relay Service
• DARTS — Design Approach for Real-Time Systems
• TX — Transmit
• MTS — Message Transfer System
• OS/2 — Operating System/2
• EFCI — Explicit Forward Congestion Indication (ATM)
• ADC — Administration Center
• SS7 — Signaling System 7
• BAP — Bandwidth Allocation Protocol

• MLM — Multi-Longitudinal Mode
• Z — Zulu Time
• LSP — Label Switched Path
• BSC — Base Station Controller
• AVR — Automated Voice Response
• HEC — Header Error Control
• ECTF — Enterprise Computer Telephony Forum
• CS-PDU — Convergence Sublayer - Protocol Data Unit
• TDM — Time Division Multiplexing
• CPC — Continous Packet Compression
• PC — Peripheral Controller
• EGSM — Extended Global System for Mobile Communications
• CAS — Column Address Strobe
• CERN — Conseil Europeen Pour La Recherche Nucleaire
• SASL — Simple Authentication and Security Layer
• # — Number sign, octothorp; special function key
• VCT — Variable Cam Timing
• UMTS — Universal Mobile Telecommunications Standard
• BIOS — Basic Input-Output System
• DTN — Data Transfer Network
• DSU — Digital Service Unit
• NAP — Network Access Point
• STA — Science and Technology Agency (Japan)
• RDS — Rate Determining Step
• HUACA — Hang Up And Call Again
• WVPN — Wireless Virtual Private Network
• N-AMPS — Narrowband Advanced Mobile Phone System
• OXCO — Oven-Controlled Crystal Oscillator
• DMT — Discrete Multi-Tone
• WIS — WAN (Wide Area Network) Interface Sublayer
• ISI — Intersymbol Interference
• PLCP — Physical Layer Convergence Procedure
• ACU — Automatic Calling Unit
• RNR — Receive Not Ready
• SETI — Search for Extraterrestrial Intelligence
• EVA — Electronic Video Agent
• RSL — Restricted Service License
• LCAS — Link Capacity Adjustment Scheme
• DM — Domain Model
• SAT — Satellite
• F/W — Firmware
• SMMR — Scanning Multichannel Microwave Radiometer
• CB — Citizens' Band
• GERAN — GSM (Global System for Mobile communications) Edge Radio Access Network
• DMT — Digital-Discrete Multi-Tone
• ZCZ — Zero Correlation Zone
• TMS — Time Management System
• GRX — GPRS Roaming Exchange
• NA — Network Adapter
• * — Star, special function key

• CBQ — Class-Based Queuing
• PMT — Photo Multiplier Tube
• OOK — On/Off Keying
• SIA — Securities Industry Association
• NHRP — Next Hop Resolution Protocol (ATM)
• SR — Service Request
• ACE — Adaptive Communication Environment
• TSE — Toronto Stock Exchange
• USF — Universal Service Fund
• ETF — Early Termination Fee
• SQ — Service Quality
• DMI — Distributed Management Interface
• DDD — Direct Distance Dialing
• VG — Voice Grade
• DAS — Distributed Antenna System
• ATD — Advanced Technology Demonstration
• MR — Mobile Router
• NC — Network Computer (PC Internet)
• FOC — Fiber-Optic Cable
• TOC — Telecommunication Operations Center
• FGD — Feature Group D
• TACSAT — Tactical Satellite
• EMR — Electromechanical Relay
• LASA — Large Aperture Seismic Array
• ILEC — Incumbent Local Exchange Carrier
• CCR — Current Cell Rate (ATMF)
• IG — Interface Group
• LIM — Line Isolation Monitor
• HUP — Hook-UP
• SAS — Special Access Surcharge
• DSI — Digital Speech Interpolation
• ISSI — Inter-Switching System Interface
• OML — Object Model Library
• BIC — Bus Interface Controller
• P — Priority
• COMB — Combined
• V — Variable
• JSC — Joint Scientific Committee (ICSU, WCRP, and WMO)
• PSS — Performance Support System
• CGI — Computer Graphics Interface
• SDN — Software Defined Network
• DXC — Digital Cross Connect
• 3GPP — Third-Generation Partnership Project
• WDN — Wireless Developer Network
• UTL — Utility
• DXF — Data Exchange Format
• FTTP — Fiber To The Premises
• BCST — Broadcast
• A/D — Analog-to-Digital converter
• WDA — Wireless Digital Assistant

• MLA — Modern Language Association
• TDRS — Tracking and Data Relay Satellites
• RS — Receive Signature
• UCM — Use Case Map
• BOSS — Binary Object Storage System
• LORAN — Long Range Aid to Navigation System
• AAL5 — ATM (Asynchronous Transmission Mode) Adaptation Layer 5
• TSB — Telecommunication Standardization Bureau
• ETOC — Electronic Table of Contents
• TBCD — Telephony Binary Coded Decimal
• WNMS — Wireless Network Management System
• CND — Calling Number Display
• MMM — Mobile Media Mode
• CSR — Customer Service Request
• ADM 3X — DS3 Add-Drop Multiplex
• RXQUAL — Received Signal Quality
• VLR — Visitor Location Register
• SD — Speed Dial
• PSO — Professional Services Organization
• LOP-P — Loss Of Pointer - Path
• PDL — Positioning Data Link
• INE — Intelligent Network Element
• SMSC — Short Message Service Center
• GOSIP — Government Open Systems Interconnection Profile
• LP — Line Pair
• DCF — Distributed Coordination Function
• LBS — Location-Based Services
• BOA — Basic Object Adapter
• SLIC — Subscriber Line Interface Circuit
• AWS — Advanced Wireless Services
• NRZ — Nonreturn To Zero
• SYNC — Synchronization
• LSC — Link State Control
• BRAN — Broadband Radio Access Network
• AWT — Agence Wallonne des Télécommunications
• SAPI — Service Access Point Identifier
• DM — Differential Mode
• ADM — Administration, Office of
• TCAM — Telecommunications Access Method
• QSTN — Question
• SNIX — Single Noise Interference Xterminator
• GTB — Global Telecom Brokers
• 802.11 HR — High data Rate IEEE 802.11 Wireless LAN protocol
• FTTK — Fibre To The Kerb
• SLV — Satellite-Launch Vehicle
• DDU — Disk Drive Unit
• SPID — Service Profile Identifier
• ELFEXT — Equal-Level Far-End Cross-Talk
• EDFA — Erbium-Doped Fiber Amplifier
• PTM — Packet Transport Mode

• TAM — Telephone Answering Machine
• CAMEL — Customized Applications for Mobile-network Enhanced Logic
• CPG — Converged Packet Gateway
• DNC — Do Not Call
• ATU-C — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Central office end
• VPC — Virtual Path Connection (ATM)
• TON — IEEE/ACM Transactions On Networking
• DCMES — Dublin Core Metadata Element Set
• ARPT — Autorité de Régulation des Postes et Télécommunications
• LFTYR — Ley Federal de Telecomunicaciones y Radiodifusión
• LB — Local Battery
• ADC — Access Deficit Charge
• CDM — Conceptual Data Model
• DTI — Digital Trunk Interface
• 4WA — Four Wire Analog
• CS — Central Station
• WAYP — White and Yellow Pages
• FRF-LMI — Frame Relay Forum - Local Management Interface
• CLP — Cell Loss Priority (ATM)
• TU — Transmission Unit
• ASAS — All-Source Analysis System
• CDPD — Cellular Digital Packet Data
• REG — range extender with gain
• LH — Link Handler
• LDN — Local Directory Number
• CFR-47 — Code of Federal Regulations Title 47 (FCC)
• AAV — Alternate Access Vendor
• CCA — Carrier-Controlled Approach
• WBMP — Wireless Bitmap
• BNCC — Base Network Control Center
• WFA — Wait for Answer
• GSM-R — Global System for Mobile (communications) – Rail
• UTRAN — UMTS (Universal Mobile Telecommunication System) Terrestrial Radio Access Network
• CON — Concentrator
• PMOS — P-channel Metal Oxide Semiconductor
• KSPS — KiloSymbols Per Second
• DLT — Delete
• CEPT — Conférence Européenne des Administrations des Postes et des Télécommunications
• RAU — Remote Access Unit
• CP — Call Processing
• WSA — Wireless Security Auditor
• SCCS — Switching Control Center System
• CACH — Call Appearance Call Handling
• COM — Comedy Central
• IMP — Interface Message Processor
• TCAP — Transaction Capabilities Application Part
• FPLMTS — Future Public Land Mobile Telecommunications System
• ECDIS — Electronic Chart Display Information System
• BA — Behaviour Aggregate
• P2P — Person-to-Person

• IMPI — IP (Internet Protocol) Multimedia Private Identity
• FDI — Feeder Distribution Interface
• LDM — Limited Distance Modem
• ALOC — Average Length Of Call
• DLU — Digital Line Unit
• ALI — Automatic Location Information
• CD ROM — Compact Disc Read-Only Memory
• CT — Computer Terminal
• CYTA — Cyprus Telecommunications Authority
• MIN — Mobile Identification Number
• CU — Cooling Unit
• CAM — Common Access Method
• 3GIP — Third Generation Internet Protocol
• TAX — Trunk Automatic Exchange
• BTN — Billing Telephone Number
• CBWFQ — Class Based Weighted Fair Queueing
• LRQ — Location Request
• BCSM — Basic Call State Model
• EMF — Event Management Framework
• GMSS — Global Mobile Satellite System
• CMIS — Common Management Information Service
• TP-PMD — Twisted Pair Physical Medium Dependent
• SCU — System Control Unit
• FB — Fine Business
• MMDS — Multichannel Multipoint Distribution Service
• SIM — Subscriber Identification Module
• WSP — Wireless Service Provider
• RNX — Restricted Numeric eXchange
• FGA — Feature Group A
• UNI — User Network Interface
• EDSX — Electronic Digital Signal Cross-Connect
• TCS — Telephony Control Specification
• KEK — Key Encrypting Key
• FDOA — Frequency Difference Of Arrival
• GOSIP — Government Open System Interconnection Profile
• 100VG — 100 Voice Grade (IEEE 802.12 AnyLAN Standard)
• DAP — Distributed Array Processor
• VCC — Voice Call Continuity
• AQP — Association for Quality and Participation
• MDN — Mobile Directory Number
• TEM — Transmission Electron Microscope
• WAE — Wireless Application Environment
• AIS-L — Alarm Indication Signal - Line
• AP — Action Point
• LIF — Logical Interchange Format
• CD-ROM — Compact Disk-Read-Only Memory
• BORSCHT — Battery feed, Overvoltage protection, Ringing, Signaling, Coding, Hybrid, and Testing
• EKTS — Electronic Key Telephone Set
• CPH — Call Party Handling
• SN — Stock Number

• FGDC — Federal Geographic Data Committee's
• SINS — Ship’s Inertial Navigation System
• SN — Service Number
• LDI — Long Distance Interconnect
• CCS — Common Channel Signaling
• ICI — Interexchange Carrier Interface
• MERIS — medium-resolution imaging spectrometer
• RWIN — Receive Window
• CELP — Code Excited Linear Prediction
• BUS — Business Units
• DNI — Data Network Interface
• CIP — Carrier Identification Parameter
• PACS — Personal Access Communications System
• WATS — Wide Area Telecommunications Service
• PMMA — Polymethyl Methacrylate
• VLP — Very Low Power
• ADCCP — Advanced Data Communication Control Procedures
• NANP — North American Numbering Plan
• DOV — Data-Over-Voice
• RICK — Repeater Interface Communications Kit
• WTS — Wireless Telecommunications Symposium
• GAN — Global Area Network
• NSE — Network Software Environment
• MBS — Maximum Burst Size (ATM)
• ETSI — European Telecommunications Standards Institute
• FAC — Forced Authorization Code
• DME — Distributed Management Environment (OSF)
• DPT — Dynamic Packet Transport
• EM — Element Manager
• TRANSEC — Transmission Security
• ARS — Automatic Route Selection
• AARQ — A-Associate Request
• ILETS — International Law Enforcement Telecommunications Seminar
• MNOS — Metal-nitride-oxide Semiconductor
• TAPI — Telephony Application Programming Interface
• RPCU — Radio Port Control Unit
• DTE — Digital Terminal Equipment
• TSG — Telephone Security Group
• PTI — Payload Type Indicator
• RTC — Real-Time Control
• AAL — ATM (Asynchronous Transmission Mode) Adaptive Layer
• BATM — Basic Telecommunication Access Method
• SCCP — Signaling Connection Control Point
• CMS — Conversational Monitor System
• SOH — Section Overhead
• APPN — Advanced Peer-to-Peer Network
• C² — Command and Control
• DLL — Digital Local Line
• SNI — Subscriber Network Interface
• FXS — Foreign Exchange Subscriber

• DDI — Direct Dialing Incoming
• ICL — Inserted Connection Loss
• BREW — Binary Runtime Environment for Wireless
• TRX — Tandem Repeater eXchange
• VGF — Voice Grade Facility
• TP — Transition Point
• TSI — time-slot interchange
• CV — Coding Violation
• DNA — Digital Network Architecture
• FFH — Fast Frequency Hopping
• ADPC — Automatic Data Processing Center
• PTCL — Pakistan Telecommunication Company Ltd
• CIC — Carrier Identification Code
• CIP — Channel Interface Processor
• FOD — Fax on Demand
• RTU — Right to Use
• PTM — Point-To-Multipoint
• MRCA — Most Recent Common Ancestor
• AWG — arrayed waveguide grating
• IDCP — Internet Device Control Protocol
• UMTS — Universal Mobile Telecommunications Service
• TRIG — Trigger
• VN — Virtual Network
• WRT/R — Wireless Transmitter/Receiver
• MFC — Multi-Frequency Code
• EC-N — Electrical Carrier (n=a number, e.g., EC-4)
• STE — Section Terminating Equipment
• CTE — Computer Telephony Engineer
• FNN — Full National Number
• NICAD — Nickel Cadmium
• EDC — Electronic Dispersion Compensator
• VSM — Vestigial Sideband Modulation
• LTU — Line Terminating Unit
• ETOM — Enhanced Telecom Operations Map
• BDSL — Broadband Digital Subscriber Line
• CLCC — Ceramic Leaded Chip Carrier
• CSLIP — Compressed SLIP
• UNO — Universal Network Operations
• AIS-P — Alarm Indication Signal - Path
• AIS-V — Alarm Indication Signal - Virtual
• CCCH — Common Control Channel
• EVC — Electronic Voucher Charging
• DE — Discard Eligible
• MH — Message Handler
• NF — Noise Factor
• E — Exchange
• LCP — Local Control Point
• SDSL — Symmetrical Digital Subscriber Line
• BOM — Bit-Oriented Message
• DCAS — Downloadable Conditional Access System

• RCP — Right-Hand Circular Polarization
• VADB — Virtual Auto Dial Backup
• RDSS — Radio Determination Satellite Service
• FCA — Fixed Channel Allocation
• ROSE — Remote Operations Service Element
• LLA — Link Level Access
• EF&I — Engineering, Furnishing and Installation
• CRV — Call Reference Value
• 3G — Third Generation (mobile communication system)
• EECM — End-to-End Call Manager
• WFT — Wireline Formation Test
• GTM — Go to Meeting
• VTIR — visible and thermal infrared radiometer
• AEA — American Electronics Association's
• CDA — Communications Decency Act's
• WVOIP — Wireless Voice over Internet Protocol
• MF — Multiple Frequency
• SRA — Seamless Rate Adaptation
• ATB — All Trunks Busy
• MCD — Community Care Access Centre
• SCR — System Change Request
• DS-3 — Digital Signal, Level 3
• RSL — Remote Serial Link
• CTIA — Cellular Telecommunications Industry Association
• ACF — Access Coordination Function
• MA — Maintenance Action
• UAN — Universal Area Network
• ILD — International Long Distance
• CLLM — Consolidated Link Layer Management
• AAP — Alternate Access Provider
• WE — Western Electric
• DRQ — Disengage Request
• AFCEA — Armed Forces Communications and Electronics Association's
• RADSL — Rate Adaptive Digital Subscriber Line
• LS — Loop Start
• ADC — Advanced Data Control
• GRUB — Greedy Reclamation of Unused Bandwidth
• IBS — In-Building Solutions
• OTF — On-The-Fly (data acquisition method)
• ACA — Adaptive Channel Allocation
• MSG — Management Steering Group
• SOR — Statement of Requirements
• NBP — Name Binding Protocol
• VFL — Visual Fault Locator
• CCS — Common Command Set
• PGP — Pretty Good Protection (encryption)
• B-CPE — Broadband Customer Premises Equipment
• SMDR — station message detail recording
• MP — Modulation Parameter
• WDS — Wireless Distribution System

• AH — Authentication Header
• SMS — Service Management System
• CAPTAIN — Character And Pattern Telephone Access Information Network
• FLL — Fixed-Loss Loop
• PSLV — Polar Satellite Launch Vehicle (Indian Space Research Organization; India)
• ATB — Above-Ground Telecommunications Backbone
• INTELSAT — International Telecommunications Satellite
• ZBTSI — Zero Byte Time Slot Interchange
• CSDU — Core Service Data Unit
• JWG — Joint Working Groupof
• ULL — Unbundled Local Loop
• LAPB — Link Access Protocol-Balanced
• RBOC — Regional Bell Operating Company (Baby Bell)
• FLN — Fixed Line Network
• ACRE — Authorization and Call Routing Equipment
• CRBT — Color Ring Back Tone
• SDLC — Systems Development Life Cycle
• DTU — Date/Time Update
• AOC — ADSL (Asynchronous Digital Subscriber LIne) Overhead Control channel
• M — Memory
• BPP — Billed Party Preference
• ASD — Alternative Service Delivery
• MAPI — Messaging Applications Programming Interface
• BHA — Busy Hour Attempts
• MC — Maintenance Control
• MEECN — Minimum Essential Emergency Communication Network
• 4WE&M — Four-Wire Ear and Mouth
• IPNG — Internet Protocol, Next Generation (now called IPv6)
• DS-1 — Digital Signal, Level 1
• SGSN — Serving GPRS (General Packet Radio Service) Support Node
• VAR — Value-Added Reseller
• WLL — Wireless Local Loop
• AOS — Alternate Operator Service
• DTL — Defense Telephone Link
• DMNG — Digital Mobile News Gathering
• CAP — Competitive Access Provider
• NICT — National Institute of Information and Communications Technology
• VP — Virtual Path (ATM)
• RX — Receiver
• CFOT — Certified Fiber-Optic Technician
• CE — Channel Element
• CCS — Call Center Service
• DECT — Digital Enhanced Cordless Telecommunication
• LMT — Lightwave Microcell Transceiver
• DC — Device Control
• BASIZE — Buffer Allocation Size
• WIN — Wireless Intelligent Network
• AB — Answer Back
• DDS — Dataphone Digital Service (AT&T)
• PMT — Program Management Team

• DR — Design Review
• NT — Network Termination
• MPU — Main Processor Unit
• AAL2 — ATM (Asynchronous Transmission Mode) Adaptation Layer 2
• LEED — Low-energy Electron Diffraction
• 4WAI — Four-Wire Analog Interface
• ET — Electronic Transmission
• TWX — Teletypewriter Exchange Service
• WTNM — Working Telephone Number Management
• BSC — Bi-Synchronous Communications
• DNSIX — Defense Network Security Information Exchange
• CLASS — Custom Local Area Signaling Services
• NCF — Network Control Facility
• SGCP — Simple Gateway Control Protocol
• STMR — Sidetone Masking Rating (telecommunications)
• ESCON — Enterprise System Connection
• SAP — Service Advertising Protocol
• TJB — Telephone Junction Box
• TCB — Telecommunication Certification Body
• SCORM — Shareable Content Object Reference Model
• ULF — Ultra Low Frequency
• MIR — Maximum Information Rate
• GSM — Global System for Mobile telecommunications
• NSEP — National Security Emergency Preparedness
• HU — Hook Up
• CLF — Carrier Line Failure
• ESM — electronic support measure
• RRC — Root Raised-Cosine
• DTAP — Direct Transfer Application Process
• FT1 — Fractional T1
• BB — Blackberry
• IMT-2000 — International Mobile Telecommunications 2000
• ATS — Abstract Test Suite
• DPA — Distributed-Power Architecture
• B-ISDN — Broadband ISDN
• TSC — Test System Controller
• RAI — remote alarm indication
• TMF — Telecommunications Management Forum
• SSN — Switched Service Network
• PROV — Provisioning
• BTS — Base Transceiver Station (cellular)
• ATTRA — Appropriate Technology Transfer for Rural Areas
• LPDP — Local Policy Decision Point
• CPOP — Circuit Precedence Over Packet data
• SN — Switching Network
• CD — Committee Draft
• LOB — Line Of Bearing/Balance
• DOD — Direct Outward Dialing
• TD — Transmit Data
• ADF — Application Dedicated File

• ET — Exchange Terminal
• CFS — Call for Service
• STD — Standard Deviation
• VO — Voice Only
• CMA — Communications Management Association
• WNAN — Wireless Neighborhood Area Network
• XNS — Xerox Network Systems
• ADIF — Accounting Data Interchange Format
• NEF — Network Element Function
• LCU — Lightweight Computer Unit
• EEROM — Electronically Erasable Read-Only Memory
• TESMA — Telecommunications Equipment and Services Master Agreement
• TUP — Telephone User Part
• ACM — Address Complete Message
• EC — Equipment Controller
• QOTS — Quality Of Telephone Services
• CDVT — Cell Delay Variation Tolerance
• SACS — Security Access Control System
• TA — Terminal Adapter (ATM)
• LULT — Line Unit/Line Termination
• BIS — Brought Into Service
• BT — Burst Tolerance
• LCF — Location Confirm
• DCO — Dial Central Office
• AIU — Analog Interface Unit
• CTTC — Centre Tecnològic de Telecomunicacions de Catalunya
• CMTS — Cellular Mobile Telephone System
• DDP — Datagram Delivery Protocol
• SMU — Service Management Unit
• TEHO — Tail End Hop Off
• LAP-B — Link Access Procedure - Balanced
• ALCAP — Access Link Control Application Protocol
• QOSM — Quality of Service Management
• COP — Character Oriented Protocol
• TMRS — TRAFFIC MEASUREMENT AND RECORDING SYSTEMS
• RTB — Retransmission Buffer
• CRS — Cell Relay Service
• TCL — Transverse Conversion Loss
• PVN — Private Virtual Network
• PAM — Pulse Amplifier Modulation
• DSVD — Digital Simultaneous Voice and Data
• GFI — General Format Identifier
• SC — Switching Center
• CDR — call detail recording
• PCN — Personal Communications Networks (European PCS)
• SBX — Small Business Exchange
• UCF — Unregistration Confirm
• AAV — Alternative Access Vendor
• AMTFT — Active Matrix Thin Film Transistor
• CPN — calling party number

• RCU — Radio Control Unit
• AGCH — Access Grant Channel
• RAD — Recorded Announcement Device
• BTP — Business Telecom Products, Inc.
• FMR — Follow Me Roaming
• DPST — Double-Pole Single-Throw
• MEH — Mobile-Executed Handoff
• APPC — Advanced Program-to Program Communications
• OMF — Object Management Framework
• P&A — Privacy and Authentication
• LCN — Local Communications Network
• REN — Ringer Equivalence Number
• SSU — Synchronization Supply Unit
• SLIC — Subscriber Loop Interface Circuit
• IBSS — Independent Basic Service Set
• TIMS — Telephone Information Management System
• FUD — Fair Use Doctrine
• CCCI — Command, Control, Communications and Intelligence
• PTE — Path Terminating Equipment (SONET)
• BAF — Bellcore AMA (Automatic Message Accounting) Format
• FESS — Flywheel Energy Storage System
• FI — Format Identifier
• TT — Text-Telephone
• ZLE — Zero-Latency Enterprise
• RJ-11 — Registered Jack type 11 (4-wire connector)
• APS — Advanced Power System
• VOB — Voice Over Broadband
• VSAT — Very Small-Aperture Terminal
• DPBX — Digital Private Branch Exchange
• VOFR — Voice Over Frame Relay
• PD — Pulse Duration
• ATU-R — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Remote terminal end
• 2G — Second-generation mobile telephone system
• CTO — Commonwealth Telecommunications Organisation
• WIVO — WIreless VelOcity
• NSDI — National Spatial Data Infrastructure
• QS — Quasi-Synchronous
• DLT — Digital Line Termination
• AVT — Audio Visual Telecommunications
• ANAC — An Automatic Number Announcement Circuit
• CBMS — Computer-Based Message System
• TP — Telephone Pole
• MA — Message Analysis
• IVP — Integrated Voice Protocol
• OSD — Onscreen Display
• RFR — Radio Frequency Radiation
• EADAS — Engineering and Administrative Data Acquisition System
• CRL — Computing Research Laboratory
• BHCC — Busy Hour Call Completions
• LIDB — Line Information DataBase

• ACNA — Access Customer Name Abbreviation
• ARFA — Allied Radio Frequency Agency
• DTU — Data Terminal Unit
• FPS — Framing Pattern Sequence
• 4G — Fourth Generation
• CDA — Communications Decency Act of 1996
• VDR — Voice Digitization Rate
• LCU — Line Control Unit
• COFA — Change Of Frame Alignment
• JWP — Joint Working Party
• DPDT — Double-Pole Double-Throw
• TSDU — Transport Service Data Unit
• ECSA — Exchange Carriers Standards Association
• MIS — Marketing Intelligence System
• IMTS — Improved Mobile Telephone Service
• PFE — Power Feed Equipment
• DECCO — DISA Defense Commercial Communications Office
• FMS — Fixed Mobile Substitution
• LBX — Low Bandwidth X
• CAE — Common Application Environment
• CSCW — Computer-Supported Cooperative Work
• SOHO — SOlar and Heliospheric Observatory
• DDU — Digital Data Unit
• DIL — Direct Inward Line
• CLD — Cross-Layer Design
• VDSL — Very high-speed Digital Subscriber Line
• COC — Central Office Connection
• AADS — Ameritech Advanced Data Services
• ADM — Administration Building
• VLBI — Very Long Baseline Interferometry
• IDCU — Integrated Digital Carrier Unit
• OMP — Open Management Platform
• MSS — Mobile Satellite Service
• PSDN — Public Switched Digital Network
• AA — Auto-Answer
• DCSS — Digital Cross-connect Systems
• ACL — Asynchronous Connection-less Link
• RDT — Recall Dial Tone
• VDSL — VHBR (Very High Bit Rate) Digital Subscriber Line
• TCA — Threshold Crossing Alert
• WDSL — Wireless Digital Subscriber Line
• NFR — Near-Field Recording
• RTFM — Read The Friendly Manual
• MB — Measured Business
• ATIS — Automatic Transmitter Identification System
• TCM — Time Compression Multiplexer
• VHM — Voice Health Monitor
• WPBX — Wireless Private Branch Exchange
• WFG — Wireless Firewall Gateway
• FC — Frame Control

• BPSK — Binary Phase-shift Keying
• ITU-T — International Telecommunication Union - Telecommunications section
• UDP — Up Down Pair
• MCR — Minimum Cell Rate (ATM)
• AEIMP — Apple Event Interprocess Messaging Protocol
• DACS — Digital Access Carrier System
• TLC — Television the Learning Channel
• MDRAM — Multibank Dram
• CATI — Computer-Assisted Telephone Interviewing
• DACS — Digital Access Cross-Connect Switch
• ADTM — Asynchronous Data Transfer Mode
• ANSI — Advanced Network Signaling Input
• CNI — Calling Number Identification
• IR — International Roaming
• NMC — Nortel Matra Cellular
• VTI — Vietnam Telecom International
• QLLC — Qualified Logical Link Control
• FECC-F — Forward Error Correction Count - Fast data
• ISD — International Subscriber Dialling
• HBH — Hop-By-Hop
• JMA — Japanese Meteorological Agency
• NSN — National Significant Number
• ALI — Automatic Location Identifier
• CSTA — Computer Supported Telecommunications Applications
• LRF — Laser Range Finder
• CRTS — Cellular Radio Telecommunications Service
• MQFP — Metric Quad Flat Pack
• WIM — WAP (Wireless Application Protocol) Identity Module
• INSAT — Indian National Satellite
• DFT — Draft
• BWX — Broadband Wireless Exchange
• CCH — Common Channel Handler
• VR — Virtual Router
• FR-SSCS — Frame Relay Service Specific Convergence Sub-Layer
• IPXCP — Internetwork Packet Exchange Control Protocol
• TMTC — Telemetry and Telecommand
• HCV — High Capacity Voice
• BSRF — Basic System Reference Frequency
• TTC — Telemetry Telecommand and Control
• OA&M — Operations, Administration & Maintenance
• CNID — Calling Number Identification Display
• ADAD — Automatic Dialing Announcing Device
• TOMS — Telecom Operations Management System
• DS-2 — Digital Signal, Level 2
• NC — Network Channel
• PSQM — Perceptual Speech Quality Measure
• ATIS — Alliance for Telecommunications Industry Solutions
• PJC — Pointer Justification Count
• CM — Connection Manager
• PDSO — Packet Data Security Overlay

• SMAS — Service Management System
• IRAC — Internal Review and Audit Compliance
• DORA — EV-DO (EVolution-Data Optimized) standard Revision A
• SAA — Service Adaptive Access
• QPA — Quality Performance Analysis
• BAM — Basic Access Module
• DDM — Data Distribution Manager
• ETB — Empresa de Telecomunicaciones de Bogotá
• EMV — EuroPay, MasterCard, Visa
• SQL — Specified Quality Level
• MAPDU — Management Application Protocol Data Unit
• RCMAC — Recent Change Memory Administration Center
• TP — Termination Point
• GOMP — Get Off My Phone
• RLA — Received Level Average
• LRM — Long Reach Multimode
• VTQ — Voice Transmission Quality
• DCS — Digital Cross-connect Switch
• AFPS — Automatic Facility Protection Switching
• NESC — National Electrical Safety Code
• DSCS — Defense Satellite Communication System
• PLE — Path Length Efficiency
• CM — Common Mode
• SDCCH — Standalone Dedicated Control Channel
• PVG — Packet Voice Gateway
• BP — Block Parity
• DTW — Dynamic Time Warping
• EGPRS — Enhanced General Packet Radio Service
• ABR — Available Bandwidth Rate
• UCA — Utility Communications Architecture
• DCEF — Distributed Cisco Express Forwarding
• SDP — Software Development Process
• GS — Ground Start
• LAT — Local Area Transport (network)
• VOB — Versioned Object Base
• IVN — Interactive Video Network
• AMOLED — Active Matrix Organic Light-Emitting Diode
• PNM — Pulse Number Modulation
• LSMS — Local Service Management System
• RTT — Roof Top Tower
• PVG — Personal Voice Greeting
• DPDCH — Dedicated Physical Data Channel
• ECS — Encryption Control Signal
• CPAP — Customer Premises Access Profile
• TPSP — Third Party Service Provider
• BCIX — Berlin Commercial Internet Exchange
• JEDEC — Joint Electronic Devices Engineering Council
• DPT — Dial Pulse Terminate
• ATL — Advanced Technology Laboratory
• MODEM — modulation and demodulation

• ACMA — Atlantic Cable Maintenance Agreement
• ULP — Upper Layer Protocol
• IRLAP — InfraRed Link Access Protocol
• CAL — Customer Access Line
• MOC — Maintenance and Operations Console
• CCC — Clear Channel Capability
• MNA — Multi-Network Area
• CLOS — Clear Line Of Sight
• CAN — Controller Area Network
• UDT — Unreliable Data Transfer
• CCP — Compression Control Protocol
• CD-R — Compact Disk-Recordable
• VSC — Vertical Service Code
• SR — Scanning Radiometer
• VPDN — Virtual Private Dial-up Network
• 802.X — Series of LAN standards developed by IEEE
• USPI — Universal Serial Phone Interface
• CIPOA — Classical Internet Protocol over ATM (Asynchronous Transfer Mode)
• FEBE-F — Far End Block Error count - Fast data
• TNMS — Telecommunications Network Management System
• VLF — Vertical-Laminar-Flow
• ESA — Enhanced Subscriber Authentication
• WPC — Wireless Personal Communications
• SHR — Self-Healing Ring
• THZ — TeraHertz
• DUL — Dial-Up List
• LMBCS — Lotus Mult-Byte Character Set
• WLAP — Wireless LAN (Local Area Network) Access Point
• USA — Underground Service Alert
• SS — Switching System
• TCC — Transmission Control Code
• EDGE — Enhanced Data for GSM (Global System for Mobile communication) Evolution
• QPM — QoS (Quality of Service) Policy Manager
• OPS/INE — Operations System/Intelligent Network Element
• MEI — Multiple Extension Interworking
• CPN — Customer Premise Network
• MVDS — Microwave Video Distribution System
• CC — Composite Clock (SONET)
• MCD — Mobile Communications Division
• NCOS — Network Class Of Service
• IDLC — Integrated Digital Loop Carrier
• 800 — Freephone
• GLT — Great Lakes Telecom
• RTC — Right to Carry
• CCSS6 — Common Channel Signaling System # 6
• ACTS — Automated Coin Toll System
• RLC — Reverse Link Channel
• INA — Information Network Architecture
• ADTS — Ameritech Digital Transport Service
• ELSEC — Electronic Security

• DTR — Down-Time Ratio
• EUMETSAT — European Meteorological Satellite
• ANT — ADSL Network Terminator
• WDM — Windows Driver Model
• VMU — Virgin Mobile USA (mobile phone network)
• SHD — Smart Handheld Device
• YIP — Your Internet Phone
• OID — Object Interaction Diagram
• TRCSL — Telecommunications Regulatory Commission of Sri Lanka
• FLC — Forward Link Channel
• MITS — Metaphors for Integrated Telecommunications Services
• UIT — Union Internationale des Télécommunications
• DACS — Digital Access and Cross-Connect System
• CALA — Customer Address Location Area
• UR — User Rate
• MT — maintenance
• CDM — Configuration Data Manager
• AMEL — Active-matrix Electroluminescent
• CEE — Communaut? Economique Europ?enne
• WAWS — Washington Area Wideband System
• ESG — Enhanced Service Gateway
• BT — Back Trace
• CWTS — China Wireless Telecommunication Standard
• SPI — Security Parameters Index
• CSR — Customer Service Report
• PCCA — Portable Computer Communications Association
• PRM — Performance Report Message
• WDP — Wireless Datagram Protocol
• LADS — Local Area Data Service
• NARC — Non-Automatic Relay Center
• TPS — Telephone Preference Service
• FR — Functional Requirement
• B-ISUP — Broadband ISDN User Part
• ABATS — Automatic Bit Access Test System
• AON — All-Optical Network
• NRI — Net Radio Interface
• WFA — Work Force Administration
• PIH — Pin in Hole
• LTU — Line Termination Unit
• VCR — Videocassette Recorder
• HPN — Home Phone Network
• AL — Alignment
• WDMW — Web Directory for Mobile and Wireless
• IDD — International Direct Dialing
• LVM — Line Verification Module
• RANAP — Radio Access Network Application Part
• STN — Station Terrienne de Navire
• RP — Radio Port
• DBN — Dial-Back Number
• HQGSM — High-Quality Global System for Mobile communications

• WNAP — Wireless Network Access Point
• FDMMA — Frequency Division Multiplexing Multiple Access
• TACS — Total Access Cellular System
• HDSL2 — High-bit-rate Digital Subscriber Line, Second Generation
• CPCI — Compact Peripheral Component Interconnect
• C/T — Carrier to Noise Temperature Ratio
• CCITT — Comite Consultatif International Telegraphique et Telephonique (now ITU-T)
• GEO — Geostationary Earth Orbit
• CODEC — Coder-Decoder (usually for audio/video data)
• DS0 — Digital Signal Zero
• PTN — Public Telephone Network
• LMU — Line Monitor Unit
• STP — Shielded Twisted Pairs
• AI — Adapter Interface
• RCF — Remote Call Forwarding
• ML-PPP — Multilink Point-to-Point Protocol
• CFNA — Call Forwarding No Answer
• EC — Enhanced Cellular
• FTAM — File Transfer Access and Manipulation
• UDS — Universal Directory Service
• AFIPS — American Federation of Information Processing Societies
• ISDNUP — Integrated Services Digital Network User Part
• 888 — Freephone
• SCC — Specialized Common Carrier
• PSN — Packet-Switched Network
• NPSI — Network Packet Switching Interface
• WEDE — Wireless Enterprise Delivery Environment
• IOC — Interoffice Channel
• FRSS — Frame Relay Switching System
• WBOK — Wireless Broadband of Oklahoma
• LZ — Lempel-Ziv compression algorithm
• VNS — Virtual Network System
• DLE — Digital Local Exchange
• NMF — Network Management Forum
• SSP — Security Service Provider
• RID — Routing Identifier
• CEPT — Conference of European Posts and Telecommunications
• AWA — Advanced Wireless Access
• BTO — Betts Telecom Oklahoma
• COBE — Corporate Owned Business Only
• CID — Craft Interface Device
• EC — Entropy Coding
• OCI — object code insertion
• QOV — Quality of Voice
• ESDS — Electrostatic Discharge Sensitive
• NECA — National Exchange Carrier Association
• MDCP — Media Device Control Protocol
• VGC — Voice Grade Channel
• SMDS — Switched Multi-megabit Data Service
• ERM — Explicit Rate Marketing

• ILF — Initial License Fee
• DEO — Digital End Office
• LGE — Loop- or Ground-start Exchange
• NMC — Network Model Coverage
• S-HTTP — Service Hypertext Transport Protocol
• VTA — Vermont Telecommunications Authority
• M2M — Multipoint-to-Multipoint
• INAP — Intelligent Network Application Part
• C — Connectivity
• HUMAN — High-speed Unlicensed Metropolitan Area Network
• FD — Full Duplex
• TRAC — Totally Reconfigurable Analog Circuit
• SAMI — Structured Adjustment & Maintenance Interface
• MOC — Ministry of Communications
• OIM — Operations Interface Module
• ATMS — automatic transmission measuring system
• CHT — Active
• PCIA — Personal Communications Industry Association
• TI — Time
• N-AMPS — Narrowband Advanced Mobile Phone Service
• BDFB — Battery Distribution Feeder Bay
• SM — Spectrum Management
• STARS — Software Technology For Adaptable, Reliable Systems
• RYP — Russian Yellow Pages
• ENS — Enhanced Network Services
• BSS — Broadband Switching System
• ERI — Enhanced Roaming Indicator
• FEAC — Far End Alarm and Control
• VGCP — Voice Grade Channel Processor
• UIF — User Interface Framework
• UPC — Usage Parameter Control
• NMS — NetWare Management System
• CT — Cordless Telecommunications
• WPKI — Wireless Public Key Infrastructure
• AMTI — Airborne Moving Target Indicator
• D-AMPS — Digital Advanced Mobile Phone Service
• TRANS — Transaction
• VCA — Voice Connecting Arrangement
• SCRC — SCCP Routing Control
• RBT — Ring Back Tone
• SVW — Sioux Valley Wireless
• ATL — Atlanta
• SAMA — Spread Aloha Multiple Access
• ARDIS — Advanced Radio Data Information Service
• SJR — Signal-to-Jamming Ratio
• DBF — Digital Beam-Forming
• TD-SCDMA — Time-division Synchronous Code-division Multiple Access
• DAF — Directory Access Function
• TI — Telecom Implementation
• BFS — Broadcast File System

• DISA — Direct Inward Switch Access
• EFD — Event Forwarding Discriminator
• TARP — Target Identifier Address Resolution Protocol
• FIC — Flight Information Center
• LI — Length Indicator
• NAM — Numeric Assignment Module
• RXP — Roaming Exchange Protocol
• TAU — Test Access Unit
• OMC — Operations and Maintenance Centre
• TNI — Telephone Network Interface
• A/V — Audiovisual
• EM — Engineer(ing) Manual
• GCS — Global Communication System
• WTA — Western Telecommunications Alliance
• IDEN — Integrated Dispatch Enhanced Network
• 3RNGR — Three Ringer
• ATACS — Army Tactical Communications System
• D3 — Digital channel bank, Third generation
• QOD — Quality of Data
• STUN — Simple Traversal of UDP (User Datagram Protocol) through NAT (Network Address Translation)
• WPOS — Wideband Packet over SONET (Synchronous Optical NETwork)
• FTTE — Fiber to the telecom enclosure
• QR — Quality record
• IPCDN — IP over Cable Data Networks
• AFRINIC — African Network Information Centre
• AAPR — Annual Average Performance Ratio
• TLP — Transmission Level Point
• WISP — Wireless Internet Service Provider
• CSL — component sublayer
• SAMS — Service Agreement Management System
• DAVIC — Digital Audio Video Council
• NML — Network Management Layer
• IMT-FT — International Mobile Telecommunications - Frequency Time
• CMAS — Cellular Management System
• MMJ — Modified Modular Jack
• USD — Universal Service Directive
• WCMP — Wireless Control Message Protocol
• VOX — Voice Operated Transmission
• FEBE-I — Far End Block Error count - Interleaved data
• ITFS — International Toll Free Services
• CVT — Circuit Validation Test
• CANARIE — Canadian Network for Advancement of Research, Industry, Education
• PTT — Post Telegraph and Telecommunications
• VVP — Versatile Voice Processing
• TPF — Transmission Priority Field
• AEE — Agent Execution Environment
• NQA — Niveau de Qualite Acceptable
• CARS — Community Antenna Relay Service
• TTG — Test Tone Generator
• PTN — Provider Telecommunications Network

• ISDP — Intelligent Shared Dual Path
• TWL — Leased Teletypewriter Service
• DTAM — Document Transfer and Manipulation
• VQA — Voice Quality Analyzer
• ISTD — International Subscriber Trunk Dialing
• GOS — Gerry Otis Simpson
• QNC — Quick Net Connect
• LLB — Line LoopBack
• IATA — Intelligent Agents for Telecommunication Applications
• RCR — Research and Development Center for Radio Systems
• IDSL — ISDN (Integrated Services Digital Network) Digital Subscriber Line
• PRM — Premium Rate
• DMS — Distribution Management System
• UPS — Un-interruptable Power Supply
• LVDS — Low-Voltage Differential Signalling
• ADTS — Automated Digital Terminal System
• EPL — Echo Path Loss
• CALC — Customer Access Line Charge
• D/I — Drop and Insert
• TACSIM — Tactical Simulation (Simulator)
• XWI — XML (extensible markup language) for Wireless Images
• LRB — Loop Reverse Battery
• TVRO — Television Receive-Only
• VAB — Vehicle Assembly Building
• CSAP — Core Service Access Point
• IR — Information Request
• SRU — Search and Rescue Unit
• CMISE — Common Management Information Service Element
• LCT — Large Capacity Tandom
• DSX — Digital Signal Cross-Connect
• DDSN — Digital Derived Services Network
• CLASS — Cell Level ATM (Asynchronous Transfer Mode) Services Simulator
• LQD — Line Quality Disturbance
• RCT — remote Control Terminal
• NBDP — Narrow Band Direct Printing
• BMAS — Business Management System
• SF — Superframe
• SMLC — Serving Mobile Location Center
• CNE — Certified Novell Engineer
• DOD — Dial on Demand
• USF — Universal Server Farm
• UOS — Units of Service
• PC — Project Coordinator
• MTBM — Mean Time Between Maintenances
• ELEC — Enterprise Local Exchange Carrier
• RFH — Remote Frame Handler
• IMT-A — International Mobile Telecommunications - Advanced
• AUSPI — Association of Unified Telecom Service Providers of India
• SCMG — SCCP Management
• ICSF — Internet Connection Sharing and Firewall

• ASA — Avaya Site Administration
• QC — Quality Circle
• SPT — System Page Table
• UAC — Uniform Annual Charge
• HDB3 — High-Density Bipolar Three-bit substitution
• SNI — Service Node Interface
• PI — Processor Interface
• MNOC — Mobile Network Operation Center
• WBTS — Wireless Business Telephone System
• CR — Connection Request
• DCC — Digital Control Channel
• VPL — Virtual Path Link (ATM)
• ETS — End of Transmission Signal
• SWIFT — Society Of Worldwide Interbank Financial Telecommunications
• COMPANDER — COMpressor/exPANDER
• PSPDN — Packet Switched Public Data Network
• RU — Release Unit
• RBS — Robbed Bit Signaling
• PRE — Preliminary
• TWA — The Wireless Association (former Cellular Telecommunciations and Internet Association)
• FHMA — Frequency Hopping Multiple Access
• VMWI — Voice Message Waiting Indicator
• BC — Basic Call
• WGX — Wireless Gateway Switch
• EXCL — Exclusive
• UVG — Universal Voice Grade
• WBI — Wireless Broadband Internet
• E-TDMA — Expanded Time Division Multiple Access
• VMO — Virtual Mobile Operator
• WAVE — Wireless Access in Vehicular Environments
• LXT — Local Exchange Terminal
• VQT — Voice Quality Testing
• LO — Lockout
• USOC — Universal Service Order Code (cable colors)
• FOE — Fiber Optic Equipment
• BTU — Basic Transmission Unit
• PNE — Path Number Efficiency
• DORK — Disciples Of The Righteous King
• TCBH — Time Consistency Busy Hours
• LTU — Line Test Unit
• T&R — Tip and Ring
• WLNP — Wireless Local Number Portability
• GVPN — Global Virtual Private Network
• ETT — Emerging Telecommunications Technologies
• ICTA — Idaho Cable Telecommunications Association
• FWS — Fixed Wireless Services
• 3WC — Three Way calling
• ECC — Emergency Communications Center
• CDSL — Consumer Digital Subscriber Line
• RCQS — Roaming Call Quality Sensor

• MLHG — Multi-Line Hunt Group
• AASR — Abbreviated Access Service Request
• XOT — X.25 Over TCP (Transmission Control Protocol)
• EA — expedited acknowledgement
• MOA — Managed Object Agent
• SAR-PDU — Segmentation And Reassembly Protocol Data Unit
• IDPR — Interdomain Policy Routing
• NF — Not Found
• TCIYP — Turks and Caicos Islands Yellow Pages
• LEC — Liquid Encapsulated Czochralski
• TWX — Teletypewriter Exchange (Telex)
• WTC — Wireless Topic Center
• CAS — Customer Accounts Service
• SNAP — Sub-Network Access Protocol
• RZ — Return to Zero
• PMD — Physical Media-Dependent
• COI — Community of Interest
• TLM — Trouble Locating Manual
• NR — Nummer
• ISP — International Signaling Point
• WIPS — Wireless Intelligent Personal Server
• ICLD — Inter-Channel Level Difference
• V — Vector
• ACEK — Authentication Encryption Key
• DTS — Digital Terminal Systems
• SMASE — Systems Management Application Service Element
• DRTL — Dial Repeating Tie Line
• ZD — Ziff-Davis
• BSSMAP — Base Station System Management Application Part
• DH — Delivery Head
• DCID — Downstream Channel ID
• TRAI — Telecom Regulatory Authority of India
• STN — Stansted Airport railway station
• KTF — Korea Telecom Freetel
• DCB — Digital Channel Bank (Sprint)
• C³ — Command, Control and Communications
• DTAU — Digital Test Access Unit
• AMC — Adds, Moves and Changes
• UDC — Universal Digital Channel
• FRAD — Frame Relay Assembler/Disassembler
• TDR — Time Domain Reflectometer
• WFFQ — Wireless Fluid Fair Queueing
• D/A — Digital-to-Analog converter
• LMS — Location and Monitoring Service
• MBAC — Measurement-Based Admission Control
• TFO — Tandem Free Operation
• AAS — Automatic Announcement Subsystem
• IPN — Intelligent Peripheral Node
• WTL — Wireless Transport Layer
• LQR — Line Quality Report

• BETRS — Basic Exchange Telecommunications Radio Service
• STU — Signal Transmission Unit
• APS — American Protective Services
• BPOP — Building Point of Presence
• DOITT — Department of Information Technology and Telecommunications
• ICCF — Interexchange Carrier Compatibility Forum
• SSCP — System Services Control Point
• MIS — Miscellaneous
• PSDS — Packet Switched Data Service
• RSN — Readable Serial Number
• CTIT — College of Telecommunications and Information Technology
• AVD — Alternate Voice/Data
• BGP4 — Border Gateway Protocol 4
• TFL — Telecom Fiji Limited
• ITA — Illinois Telecommunications Association
• QEDI — Quod Erat Demonstrandum
• PAGCH — Paging and Access Grant Channel
• WAW — Wide Area Wireless
• RSS — Received Signal Strength
• SES — Scientific and Engineering Software
• LBA — Location-Based Advertising
• SIGTRAN — Signaling Transport
• FOTS — Fiber Optical Transmission System
• ENUM — tElephone NUmber Mapping
• LDB — Last Data Bit
• EOI — End of Image
• DS — Delivery System
• AT — Attenuation
• S&F — Store & Forward
• TSC — Technical Standards Committee
• DBRN — deciBel Relative to Noise
• GPBX — Global Private Branch eXchange
• TASI — Time Assigned Speech Interpolation
• RDI-L — Remote Defect Indicator - Loop
• ARJ — Admission Reject
• YAC — Yet Another Caller-ID program
• DNA — Do Not Answer
• STN — Station Terrestre de Navire
• WUP — Wired Up Privacy
• RCH — Receive Channel
• TXS — Telephone eXchange Strowger
• CONS — Connection-oriented Network Services
• EDT — European Deaf Telephone
• SPU — Service Publication Unit
• CIS — Center for Integrated Systems
• DCU — Distribution and Control Unit
• WTA — Wireless Telephony Applications
• DTV — Digital Television
• MVD — Motion Vector Data
• ASIC — Application Specific Instruction Code

• RFIDAI — Radio Frequency IDentification Association of India
• FECC-I — Forward Error Correction Count - Interleaved data
• IRAC — Interdepartment Radio Advisory Committee
• LRF — Location Registration Function
• DRTT — Dial Repeating Tie Trunk
• PPV — Pay-Per-View
• AGPS — Assisted Global Positioning System
• WAPI — Wireless LAN Authentication and Privacy Infrastructure
• IPTD — Internet Protocol Telephony Design
• EC — Echo Cancelling
• INWATS — INward Wide Area Telecommunications Service
• CSAC — Computer Science Accreditation Commission
• RDF — Remote Distribution Frame
• MSO — Marine Safety Office(r)
• JSR — Jump to Subroutine
• PSC — Picture Start Code
• SE — Southeast Euro
• BTE — Broadband Terminal Equipment
• JDC — Japan Digital Cellular
• MLMS — Mobile Learning Management System
• CAS — channel associated signaling
• DECT — Digital Enhance Cordless Telecommunications
• LOH — Line Overhead
• SS6 — Signalling System 6
• CSV — Circuit Switched Voice
• ALT — Automatic Link Transfer
• DTC — Department of Telecommunications and Cable
• CCBS — Completion of Call to Busy Subscriber
• NFF — Neutral File Format
• Q3 — Network Management Interface
• SCE — Service Creation Environment
• NS — Non-Standard
• CIU — Communications Interface Unit
• FACS — Facility Assignment and Control System
• PTT — Post, Telephone, and Telegraph (authority)
• IOT — Interoffice Trunk
• 3WO — Third Wire Open
• ITAD — Integrated Telephone Answering Device
• SPCS — Stored Program Control Switch
• STMB — Space-Time Multiple Beam
• WDRM — Wireless Design Reference Manual
• LOF — Loss of Frame (ATM)
• NARSAP — National Advanced Remote Sensing Application Program
• CMOS — Cellular Management Operation System
• W-CDMA — Wideband Code-Division Multiple-Access
• ITCC — Information Technology and Communications Complex
• MC-SS — Multi-Carrier Spread Spectrum
• ALIS — Access Lines in Service
• EA — Emergency Action(s)
• WIRC — Wireless Information Resource Center

• HSCSWD — High-Speed Circuit-SWitched Data
• KBS — Kilobits per Second
• BFW — Broadband Fixed Wireless
• OC-48 — Optical Carrier Signal, Level 48
• MES — Master Earth Station
• DS-4 — Digital Signal Level 4
• TMF — Telemanagement Forum
• ISSP — Interim Interswitch Signaling Protocol
• CCC — Credit Card Calling
• ITOC — Independent Telephone Operating Company
• NMAS — Network Management System
• MHL — Mobile High-definition Link
• CLIP — Caller Line Identification Presentation
• HIP — Holes In Phonebooks
• SIO — Service Information Octet
• QQS — QOS (Quality Of Service) Query Service
• CMT — Commercial Metering Transponder
• DFRI — Datacom Reference Frame Input
• KB — Knowledge-Based
• IPT — Internet Protocol Telephony
• TADS — Target Acquisition Designation Sight
• ONI — Operator Number Identification
• CSAA — Central Service Area Authority
• SQR — Signal to Quantizing noise Ratio
• D4 — Digital channel bank, Fourth generation
• MFJ — Modified Final Judgement
• F — Flow
• TSR — Terabit Switch/Router
• SARTS — Switched Access Remote Test System
• DS-1C — Digital Signal, Level 1C
• OC-96 — Optical Carrier Signal, Level 96
• MCPC — Multiple Channels Per Carrier
• MHD — Maximum Hour Demand
• CMAP — Connection Management Access Protocol
• ACOU — Additional Call Offering Unrestricted
• SVI — Service Interception
• BLP — Burst Loss Probability
• SCU — Service Creation Unit
• ARQ — Admission Request
• HCDS — High Capacity Digital Services
• EML — Element Management Layer
• AI — Airborne Interception
• CDB — Configuration Data Base
• TELECOM — Telecommunications
• WOIP — Wireless communications over Internet Protocol
• IO — Inter-Office
• LRN — Local Routing Number
• MMS — Multimedia Message Service
• ASP — Active Signaling Protocol
• DDSD — Delay Dial Start Dial

• FCT — Fixed Cellular Terminal
• IMPCS — Indian Mobile Personal Communication System
• TPB — Talking Phone Book
• MC — Management Center
• ASTE — Advanced Systems and Telecommunications Equipment
• HTO — Hellenic Telecommunications Organisation
• QOSOI — Quality Of Service Over IP (Internet Protocol)
• PHIGS — Programmer's Hierarchical Interactive Graphics System
• VM — Voice Messaging
• SAM — Service Access Multiplexer
• CUG — Closed Users Group
• ROC — Receiver Operating Characteristic
• WAR — Wireless Access Revolution
• BEAR — Billed Entity Applicant Reimbursement
• LATA — Local Access Transport Area
• AAR — Automatic Alternate Routing
• VPM — Voice Private Message
• SVGA — Super VGA
• STAN — Supply of Telstra Account Number
• APTG — Asia Pacific Telecom Group
• MVDM — Multiple Virtual DOS Machine
• SSTC — Subsystem Status Test Control
• CFS — Customer Facing Services
• DFT — Draft Tax Forms
• WARP — Wireless ATM (Asynchronous Transmission Mode) Research Project
• BISDN — Broadband Integrated Services Digital Network
• O/G — Outgoing
• MIC — Management Integration Consortium
• BHP — Burst Header Packet
• PLM — Product Line Manager
• DMP — Decode Media Protocol
• DSP — Data Service Provider
• ECA — Extended Calling Area
• SEM — Sionscanning Electron Microscopy
• VOX — Voice Exchange
• DX — Duplex Signaling
• GTB — Global Telecoms Business
• RPV — Resource Property Value
• HFT — Human Factors in Telecommunications
• CVSD — Continuous Variable Slope Detection
• WSL — Wireless Systems Laboratory
• SNI — Subscriber-Network Interface
• COB — Change Of Billing
• APR — Alarm Processing Remote
• ISSIP — Inter-Switching System Interface Protocol
• ACE — Authentication Encryption
• MTS — Message Transmission Subsystem
• MRVT — MTP Routing Verification Test
• RA — Requirements Analysis
• UBC — Utility Based Computing

• UASL — Unified Access Service License
• LAP-B — Link Access Protocol-Balanced
• TAE — Terminal Adapter Equipment
• P — Point
• CASE — Computer-Assisted Software Engineering
• MP — Master Processor
• IC-POT — Interexchange Carrier-Point of Termination
• MMDS — Multichannel Multipoint Distribution System
• PR — Preference
• PM — Processable Mode
• CCC — CDMA Cluster Controller
• TDB — Technology Development Board
• CSP — Converged Service Platform
• ESMT — Ecole Superieure Multinationale Des Telecommunications
• CF — Coin First Payphone
• DTF — Digital Transmission Facility
• REGEN — Regenerator
• DCC — Data Communications Channel
• TXD — Transmit Data
• URC — Utility Reference Customer
• DLE — Digital Line Equipment
• MMC — Minimum Monthly Charge
• CSP — Continuous Speech Processing
• UIH — Unnumbered Information with Header check
• BTL — Bell Telephone Laboratories, Inc.
• NATA — North American Telecommunications Allocation
• SS5 — Signalling System 5 (2400/2600 Hz tones)
• SRTS — Synchronous Residual Time Stamp
• HTU-R — HDSL (High-bit-rate Digital Subscriber Line) Transmission Unit - Remote
• DM — delta modulation
• LSAP — Link Layer Service Access Point
• LGS — Loop- or Ground-start Subscriber
• SMG — Super Master Group
• RTU — Remote Test Unit
• MOD — Modulo
• AS — Active Service
• DM — Design Manager
• VASP — Value-Added Service Provider
• WNVA — wireless Network Vicinity Assessment
• OC-1 — Optical Carrier Signal, Level 1
• CC — Coordination Center
• ULC — Universal Line Card
• URR — UHF (Ultra-High Frequency) Radio Receiver
• HSUPA — High-Speed Uplink Packet Access
• MAHO — Mobile Assisted Handoff
• DQDB — Distributed Queue Double Bus
• MTIE — Maximum Time Interval Error
• RFS — Resource Facing Service
• SWAT — Sit, Wait, and Talk
• TSPS — Traffic Service Position System

• AIOD — Automatic Identification of Outward Dialing
• LAC — Line Assignment Center
• HKT — Hong Kong Telecommunications Ltd.
• ISM — Interstellar Medium
• CLECS — Competitive Local Exchange Carriers
• ACVS — Ameritech Customized Video Service
• DMTF — Desktop Management Task Force
• CCEA — Cross Connect Equipment Assignment
• TSAP — Telecommunication Systems Analysis Position
• EV-DV — EVolution Data/Voice
• SMDS — Satellite Multimedia Delivery System
• M-M — Multiplex-Multicast
• CNAD — Calling Name Delivery
• MDTS — Mobile Data Terminal Software
• DS-2 — Digital Stream 2 (6.312 mbps)
• LQO — Line Quality Operation
• CUSA — Central Urban Service Area
• LME — Line Monitoring Equipment
• SMSL — Standard Multimedia Scripting Language
• STV — Subscription Television
• DLC — Digital Leased Circuit
• DMB — Disconnect and Make Busy
• MIDP — Mobile Information Device Protocol
• RSL — Request and Status Links
• TTIL — Team Telecom International Ltd.
• EVN — Enterprise VoIP (Voice-over-IP) Network
• TBRL — Terminal Balance Return Loss
• RPE-LPC — Regular Pulse Excited - Linear Predictive Coder
• CPC — Crosstalk Prevention Coding
• UBL — Universal Bluetooth Link
• TIMS — Transmission Impairment Measuring Set
• CSCC — coordinated state change control
• FCCSET — Federal Coordinating Committee for Science, Engineering and Technology
• SLICE — Selective Line Insertion Communication Equipment
• JYP — Jamaican Yellow Pages
• ITU-TSS — International Telecommunications Union - Telecommunications Standardization Sector
• STE — Software Test Environment
• SSS — Subscriber Switching Subsystem
• DLCS — Digital Loop Carrier System
• TME — Telocator Message Entry
• LAP-D — Link Access Procedure- Digital channel
• TSD — Type Specific Driver
• DCP — Distributed Collaborative Planning
• NR — normal
• H11 — High-capacity ISDN channel operating at 1.536 Mbps
• RCMS — Recharge Card Management System
• SQE — Signal Quality Error
• ML — maximum length
• TAP — Test Access Path
• ATR — Advanced Telecommunications Research Institute

• ECAN — Echo Cancellation
• RDI-V — Remote Defect Indicator - Virtual
• PRCS — Philips Radio Communications Systems
• TSM — Transaction State Machine
• IN7 — Compaq SS7 stack
• DMI — Digital Multiplex Interface
• WNAS — Wireless Network Access Services
• OLEC — Other Local Exchange Carrier
• SCSA — Standard Consolidated Statistical Area
• MNP — Microcomputer Networking Protocol
• ECMA — European Community Manufacturers Association
• WTDC 98 — World Telecom Development Conference 1998
• ISC — International Switching Center
• CNT — Corporacion Nacional de Telecomunicaciones
• GEO — Geostationary-Earth-Orbit
• CR — Call Reference
• UPCU — Uplink Power Control Unit
• PPT — Permanent Part Time
• WSN — Wireless Sensor Network
• IWU — Interworking Unit
• IOCDS — Input/Output Configuration Data Set
• IS-41 — TIA/EIA Interim Standard for mobile management
• PTK — Post and Telecom of Kosovo
• ISDT — Integrated Services Digital Terminal
• STDM — Statistical Time Division Multiplexer
• UCS — Universityrsal Multiple-Octet Coded Character Set
• VTAC — Vermont Telecom Advancement Center
• GSMA — Global System Mobile Association
• CITR — Canadian Institute for Telecommunications Research
• EOT — Eastern Oregon Telecom
• XDSL — "generic" Digital Subscriber Line
• ALC — Automatic Line Controller
• CAIRO — Communications Audio Interface for Remote Operations
• OTH-B — Over-the-Horizon Backscatter
• SGW — Server GateWay
• STE — Syrian Telecommunications Establishment
• LMS — Local Measured Service
• MJU — Modular Jack Unit
• ABTA — Associação Brasileira de Telecomunicações por Assinatura
• SGS — Software Generation System
• MAC — Message Authenticity Check
• PDE — Positioning Determination Entity
• BTMS — BITEK Telecommunications Management System
• YBY — Why Be Yellow
• HPPI — High-Performance Parallel Interface
• IOCA — Interception of Communications Act
• IDC — Information Distribution Company
• RTAP — Real-Time Application Platform
• WTA — Wireless Telephony Application
• TAAC — Telecommunications Access Advisory Committee

• MMDX — Multi-Media Data Services
• DVC — Digital Video Compression
• SMRP — Simple Multicast Routing Protocol
• IU — Internal Use
• VRC — Virtual Redundancy Check
• NSPE — National Society of Professional Engineers
• CDRM — Cross-Domain Resource Manager
• TSMA — Telecommunications Services Master Agreement
• UMTS — Universal Mobile Telecommunication Services
• RDTD — Restricted Differential Time Delay
• ROH — Receiver Off-Hook
• OCTS — Ocean Color and Temperature Scanner
• WAGN — West Antarctic GPS (Global Positioning System) Network
• MAPP — Mobile Access Personal Presence
• DF — Distributing Frame
• WAVE — Wide Area Voice Exchange
• CL — cell loss
• AC — Absorption Coefficient
• MOE — Modem Operating Environment
• NATS — North American Terrestrial System
• WTN — Working Telephone Number
• CCO — Component Coordinator
• CW — Call Waiting Supplementary Service
• PTAM — Professional Telephone Answering Machine
• IVW — InfoView Wireless
• PCMCIA — Personal Computer Memory Card Industry Association
• IPCU — iPhone Configuration Utility
• FCO — Foreign Central Office
• SPNI — Service Provider Network Identifier
• RCV — ReCharge Voucher
• UTP — Universal Transmission Protocol
• TBI — Telecom Brokerage Inc
• PWT — Personal Wireless Telecommunication
• ECC — Extended Community Calling
• TIMS — Transmission Impairment Measurement System
• NSM — Network Status Monitor
• DCA — Distributed Communications Architecture
• IOS — Internet Over Satellite
• ACL — Average Call Length
• UIT — Union Internationale des Telecommunications
• CK — Check Bit
• IQ — In-phase and Quadrature
• BSVCI — Broadcast Signaling Virtual Channel Identifier
• WIG — Wireless Internet Gateway
• DUNCE — Dial-Up Networking Connection Enhancement
• WPOP — Wireless Point-of-Presence
• NBS — New British Standard
• CPS — Carrier Pre-Selection Service
• VOI — Voice Over Internet
• VSM — Voice Service Module

• TP — Transaction Processor
• PPCH — Packet Paging Channel
• WIX — Wireless Information EXchange
• L4 — Layer 4
• SLC — Service Level Contract
• WSF — Workstation Function
• WIPI — Wireless Internet Platform for Interoperability
• WACN — Wide Area Communications Network
• WFM — Wireless Frequency Modulation
• WIWT — Wireless Internet of West Tennessee
• VRT — Voltage Reduction Technology
• LET — Line Equipment Transfer
• MMMS — Mobile Multimedia Messaging Service
• LPU — Line Protection Unit
• WAL — WATS (Wide Area Telecommunications Service) Access Line
• LTP — Long Term Prediction
• ACA — Automatic Circuit Assurance
• MM — mismatch
• BT — Busy Tone
• C-M — Control-Monitor
• CCTA — Cctacentral Computer And Telecommunications Agency
• WCRL — Wireless Communications Research Laboratory
• LCA — Line Circuit Address
• ITU-R — International Telecommunication Union-Radiocommunications
• OE — Originating Equipment
• CICT — Commission on Information and Communications Technology
• IMT — International Mobile Telecommunications
• ITSO — International Telecommunications Satellite Organization
• WTDC 2003 — World Telecom Development Conference 2003
• BS — Busy Season
• TRAN — Transient
• TSGR — Transport System Generic Requirements
• POR — Power On Reset
• VDV — Voice/Data/Video
• IOPS — Internet Operators Providers Services
• ITU-T — International Telecommunication Union-Telecommunications
• BWRC — Berkeley Wireless Research Center
• OMNCS — Office of the Manager, National Communications System
• VRS — Video Relay Service
• MID — Maritime Identification Digits
• VOF — Voice Over Fiber
• WTDM — Wideband Time Division Multiplexing
• MEOS — Medium Earth Orbit Satellite
• SVC — Single Voice Coil
• TOT — Time Of Transmission
• MFA — Multi-Frame Alignment
• ECITTC — European Committee for Information Technology Testing and Certification
• ADTS-E — Ameritech Digital Transport Service - Enhanced
• SRVT — SCCP Routing Verification Test
• DPCM — Differential Pulse Code Modulator

• UMS — Unified Messaging Service
• WBA — Wireless Broadband Access
• CGT — Consultants Group for Telecommunications
• WDF — Wireless Data Forum
• SHN — Self-Healing Network
• MERS — Most Economical Route Selection
• UCD — Uniform Call Distributor
• PN — Public Network
• WNSK — Wireless Networking Starter Kit
• CARS — Cable Antenna Relay Services
• WAPF — Wireless Application Protocol Forum
• ETT — Emona Telecoms Trainer
• TSAR — Terminating Switched Access Rate
• CASP — Communications Application Service Provider
• FECC — Federal Emergency Communications Coordinator
• TCCMS — Telecom Consumer Complaints Monitoring System (India)
• UPC — Universal Personal Communication
• OC-12 — Optical Carrier Signal, Level 12
• WCA — Wireless Cable Association International
• WDA — Wireless Developer Agency
• IPC — Initial Paging Channel
• AUBW — AutoBot Walkthrough
• GATE — GPRS (General Packet Radio Service) Application Test Environment
• RLF — Remote Line Failure
• TI — Time Integration
• LOSW — Loss Of Synchronous Word
• OTF — Optical Transfer Function
• USI — User System Interface
• WNC — Wireless Network Communications
• QLC — Quality Com
• WID — Wireless Information Device
• QSK — Quadrature Shift Keying
• FEFA — Far End Failure
• DNR — Dial Number Recorder
• DAMPS — Digital Advanced Mobile Phone System
• DMPB — Digital Multi-Point Bridging
• IRB — Instruction Reorder Buffer
• GSN — GPRS (General Packet Radio Service) Support Node
• AWCC — Afghan Wireless Communications Company
• EMLPP — Enhanced Multi-Level Precedence and Priority
• TSAU — Time Slot Access Unit
• GTXC — Global Telephone Exchange Carrier
• FFM — First Failure to Match
• TSS — Telecommunication Standards Sector
• TEO — Telephone Equipment Order
• LAP — Link Access Protocol
• UDLC — Universal Digital Loop Carrier
• CDF — Communications Data Field
• WTIA — Wireless Technology Industry Association
• DVI — Digital Video Interleaved

• SCM — Service Class Mark
• CCIR — Comittee Consultatif International Radiotelecommunique
• BASH — Bandwidth Sharing
• CPT — Cellular Paging Teleservice
• CIS — Communications and Information Systems
• BUC — Block Up-Converter
• D — Diagonal
• OC-3 — Optical Carrier Signal, Level 3
• CTE — Computer Telephony Engine
• PTN — Portable Telephone Network
• ESG — Error Satellite Gauge
• BU — Back Up
• STS — Synchronous Transfer Signal
• VDT — Video Dial Tone
• APTC — Atlantic Provinces Telecommunications Council
• CLS — Current Level of Service
• SLM — Subscriber Loop Multiplex
• AC — Authorization Center
• TELCO — Telecommunication Network for Cooperative Driving
• TBPS — terabit per second
• NSP — National Signaling Point
• THL — Trans-Hybrid Loss
• DWB — Designer's Workbench
• DODD — Department Of Defense Directive
• DHA — Dialogue Handling
• RRJ — Registration Reject
• AAC — Alternate Area Code
• HTU-C — HDSL (High-bit-rate Digital Subscriber Line) Transmission Unit - Central office
• RXD — Receive Data
• LOP-V — Loss Of Pointer - Virtual
• CSUR — Conscript Unicode Registry
• LLI — Logical Link Identifier
• CIL — Call Identification Line
• CTS — Call Tracking System
• ASE — Accredited Systems Engineer
• CELL — Caller Enabled Leased Line
• BBCR — BroadBand Communications Research
• WITS — Washington Interagency Telecommunications System
• ROPP — Receiver Only Packet Pair
• WICS — Wireless Integrated Communication System
• WOS — Wireless Optimization Service
• BRTL — Blu-Ray Triple Layer
• SIU — Subscriber Interface Unit
• MTS — Message Telecommunications Service
• WITS — Web Interface for Telescience
• MCF — Message Confirmation Frame
• C — Clock
• CPS — Customer Premises System (Bellcore)
• L — Lambert
• LAPM — Link Access Protocol for Modems

• WCB — Wireline Competition Bureau (FCC)
• AMT — Australasian Mobile Telecommunications
• KSR — Key Send Receive
• ILETS — Idaho Law Enforcement Telecommunication System
• DCCH — Digital Control Channel
• OC-192 — Optical Carrier Signal, Level 192
• LUL — Land Use Line
• WECA — Wireless Ethernet Compatibility Alliance
• OM — operations management
• CT — Control terminal
• RCDD — Registered Communications Distribution Designer
• DCD — Data Carrier Detect
• A — All lines
• MJT — Modular Jack Terminal
• ICC — Interexchange Carrier Charge
• SS3 — Signalling System 3 (2280 Hz tone)
• IMMAT — Instituto Municipal Malvinas Argentinas Telecomunicaciones
• ARAI — Adjunct Route Application Interface
• DS-1C — Digital Stream 1C (3.152 mbps)
• TTGS — Test Tone Generator Software
• HDT — Host Digital Terminal
• SCAT — Single Channel Autonomous Trunking
• SUBT — Subscriber Terminal
• STEREO — Solar Terrestrial Relations Observatory
• MSID — Mobile Station Identity
• UPR — User Performance Requirement
• AT — Access Terminal
• ECR — Enhanced Call Routing
• CBS — Common Battery Signaling
• MDU — Monthly Domestic Usage
• ITEC — Internet Telecom and Electronic Commerce
• ITTP — Information Technology And Telecommunications Policy
• BNT — Broadband Networking Technology
• FICORA — Finnish Communications Regulatory Authority
• X25 — A Packet Switching Protocol
• TEM — Telecommunications Expense Management
• ETC — Enhanced Telecommunications Corporation
• PTFP — Public Telecommunications Facilities Program
• VRSP — Voltage, Ringing Signal Positive
• TNS — Time to Next Send
• IESS — INTELSAT Earth Station Standard
• CQ — Communications Quality
• JTU — Japan Telephone Upgrade
• ESP — Essential Service Protection
• HOMEPNA — Home Phoneline Networking Alliance [also HomePNA2]
• IWE — Institute for Wireless Education
• WMA — Wireless Messaging API (Application Programming Interface)
• DUC — Designated Underlying Carrier
• ITV — Instructional Telecommunications And Video
• RSU — Remote Switching Unit

• SEE — Software Engineering Environments
• RTZ — Rate for Transmission service for a Zone load
• RSI — Record Status Indicator
• ACG — Automatic Code Gapping
• SKT — Sun Kyung Telecom
• BIT — Bureau of Information and Telecommunications
• SC — Standards Committee
• ACR — Anonymous Call Rejection
• WTR — Wireless Token Ring
• WWA — Wireless Web Application
• QIC — Quality Improvement Council
• WTK — Wireless Toolkit
• WIPA — Walkup Internet Port Authentication
• CTSO — Cellular Telephone Service Order
• LCN — Local Channel Number
• TWC — The Weather Channel(r)
• OOR — Operator Override
• ASC — Available Spare Capacity
• ECSA — Exchange Carrier Standards Association
• DS-4 — Digital Stream 4 (274.016 mbps)
• C/R — Control/Response indication bit
• DLOL — Digital Loss Of Link
• VVD — Voice and Video Data
• IVI — Intel Video Interactive
• ILRM — Interim Local Management Interface
• CDO — Community Dial Office
• SUF — Service Update Facility
• MBCM — Multiple Block-Coded Modulation
• WTPF 3 — World Telecommunication Policy Forum 3
• PTO — Public Telephone Operator
• PSX — Power System Exchange
• SWN — Statewide Wireless Network
• VTE — Virtual Test Environment
• ERMES — European Radio Message System
• TOM — Telecom Operations Map
• TTTN — Tandem Tie Trunk Network
• SINAP — Signalling and Intelligent Network Applications Platform
• MSSC — Mobile Satellite Switching Centre
• DDCZ — Daily Demand Charge for a Zone
• MFAS — Multi-Frame Alignment Signal
• LLAR — Local Loop Access Ring
• STDM — Statistical Time Division Multiplexing
• LWT — Listen While Talk
• SSCOP — Service Specific Connection Oriented Protocol (ATM)
• BRQ — Bandwidth Request
• SSP — Service Switching Point
• IMTC — International Multimedia Telecommunication Consortium
• DTF — Dial Tone First
• ITF — Information Transport Function
• ESSE — Embedded Systems Software Environment

• O — Optical
• EFRC — Enhanced Full Rate Codec
• CO — Central Operations
• SPCS — Stored Program Control System
• WIAS — Wholesale Internet Access Services
• TMOD — Telecommunications and Mission Operations Directorate
• WDCS — Wireless Distributed Communication System
• CID — Cell IDentification number
• TTK — Telephone Travel Kit
• TED — Triteal Enterprise Desktop
• WDL — Wireless Device License
• TSIP — Telecommunications System Installation Plan
• AMP — amplifier / amplification
• BANC — Broadband Access Network Coordination
• MED — Manipulative Electronic Deception
• SCRB — SBC (Single Board Computer) Control and Reset Box
• IWCS — Integrated Wideband Communications System
• BCM — Bit Compression Multiplexer
• GT&T — Guyana Telephone and Telegraph Company
• FERF — Far-End Receive Failure
• LSOA — Local Service Order Administration
• ROF — Reformat on the Fly
• URM — Uniform Redial Model
• MGW — Mobile GateWay
• DCH — Discrete CHannel
• ENST — Ecole Nationale Supérieure des Télécommunications
• TRK — Trunk
• TMT — Technology, Media, and Telecommunications
• LETS — Line Efficiency Tracking System
• MFN — Multiple Frequency Network
• WUA — Wireless USB (Universal Serial Bus) Adapter
• TVR — Telephone Voice Response
• MTS — message transport system
• T3 — Transmission service at the DS3 rate of 44.736 Mbps
• CTN — Corporate Telecommunication Networks
• TSSI — Telecom Switched Services Interoperability
• E&M — Earth and Magneto (signaling leads)
• MUF — Maximum Useable Frequency
• RDI-P — Remote Defect Indicator - Path
• DCN — Disconnected and Changed Numbers
• SPH — Samsung PHone
• MVPRP — Multivendor Problem Resolution Process
• TANE — Telephone Association of New England
• SRS — Supported Residential Services
• WTB — Wanted to buy
• DS-1 — Digital Stream 1 (1.544 mbps)
• D/U — Delay Unit
• HTU — HDSL (High-bit-rate Digital Subscriber Line) Transmission Unit
• WRU — Wireless Receiver Unit
• ONE — Other Network Entity

• CMP — Connection Management Procedures
• ECP — Exchange Control Panel
• RFA — Recurrent Fault Analysis
• RI — Ring In
• ATM — Automated Transmissions Machine
• DLI — Dialed Line Identification
• SWF — SWitched Fractional
• WSNN — Wireless Sensor Network News
• SQM — Signal Quality Manager
• DVCC — Digital Verification Color Code
• OC-24 — Optical Carrier Signal, Level 24
• SHM — Short-Haul Modem
• MM — Multimode (fiber optic cable)
• IDM — Interim Data Modem
• RNW — Radio NetWork
• LADT — Local Area Data Transport
• LQN — Line Quality Network
• VOIPTXT — Voice over Internet Protocol Text
• APOT — Access Point Of Termination
• CTIE — Centre for Telecommunications and Information Engineering (Monash University; Australia)
• DSP — Domain Specific Part
• HSC — High Speed Connect
• WWVC — WorldWide VideoConferencing
• CEPT — Committee of European Postal & Telephone (authorities)
• MEO — Middle-Earth-Orbit
• CS — Connection Segment
• LMOS — Loop Maintenance Operations System
• SIT — Special Information Tone
• VMB — Voice Mail Box
• WISI — Wireless Integrated Strike Interface
• SDK — Service Development Kit
• FELB — Far-End Loop Back
• CCS — Centa- (hundred) Call Seconds
• UCS — Unified Communication Service
• CTNS — Certified Telecommunications Network Specialist
• DSVT — Digital, Secure Voice Telephone
• AA — Automatic Answer
• HIC — Head-End Interface Converter
• FSM — Field Service Manager
• RTP — Research Triangle Park
• ITSP — Internet Telephone Service Provider
• KTA — Kentucky Telecom Association
• WTDC 2002 — World Telecom Development Conference 2002
• ESL — Educational Sales Ledger
• ANCD — Automatic Network Call Distrubution
• SLC — Subscriber Loop Carrier
• WTRP — Wireless Token Ring Protocol
• LMC — Loop Maintenance Center
• GSA — Guarded Single Assignment
• CCSD — Cellular Circuit Switched Data

• WL — Wire Line
• NSSG — Network Solutions and Service Group
• SSS — System/segment Specification
• YLT — Your Local Telecom
• ITTC — Information and Telecommunication Technology Center
• ILQ — Inbound Link Quality
• INPT — Institut National des Postes et Télécommunications
• JICC — Justice International Calling Card
• DNI — Did Not Include
• ETET — Electrical and Telecommunications Engineering Technology
• SYNC — Synchronous
• NTON — National Transparent Optical Network
• ZUD — Zero Unscheduled Downtime
• ISD — Instructional Systems Designers
• ZPD — Zero-Plus Dialing
• NSK — Nonstop Kernel
• PTCM — Pragmatic Trellis-Coded Modulation
• HCT — Hierarchical Cellular Tree
• RACE — Research for Advanced Communications in Europe
• TAMS — Telecom Analysis and Management System
• WTNP — Wireless Telephone Number Portability
• WNM — Wireless Network Management
• LL — Lower Layer
• AGRAS — Air-Ground Radiotelephone Automated Service
• STP — Shielded Twisted-Pair
• WIT — Wireless Image Transfer
• COMS — Cambridge Open Mobile System
• TEDP — Telecommunication Equipment Distribution Program
• BIPT — Belgian Institute for Post and Telecommunications
• SPN — Service Panel Number
• CSF — Common Service Framework
• TVL — Telecoms Virtual Library
• WIDS — Wireless Intrusion Detection Sensor
• AA — Agile Access
• QNS — Questar Network Services
• WNT — Windows NT
• SCS — Signal Collection System
• TE — Thermoelectric
• AA — Audit Agent
• TAPS — TELEPHONE APPLICATION PROCESSING SYSTEM
• VF0 — Voice Fundamental Frequency
• HOPA — Higher-Order Path Adaptation
• JTRS — Joint Tactical Radio Systems
• WNA — Wireless Network Adapter
• CD — Carrier Detect
• WTRS — Wisconsin Telecommunication Relay System
• LAP-D — Link Access Protocol-D channel
• T — Tip
• TSG — Test Signal Generator
• UNL — Unlisted

• TWSS — Telecom Web Services Server
• RATS — Richmond Amateur Telecommunications Society
• ISC — Information Systems Council
• NTSA — Networking Technical Support Alliance
• SWANSAT — Super-Wide Area Network SATellite
• T3 — 44.736 Mbits per Second line
• DSX-2 — Digital Stream Crossconnect 2 (6.312 Mbps)
• UBT — Universal Backend Tester
• MBA — Masters in Business Administration
• TIBS — Tactical Information Broadcast Service
• PICS — Protocol Implementation Conformance Statement
• CERN — Centre Europйen de Recherche Nuclйaire
• OC — Output Controller
• DMB — Digital Multimedia Broadcasting
• WORP — Wireless Outdoor Router Protocol
• WVI — Wireless Vehicle Interface
• DP — Drop Point
• MEAS — Measurement Specialties, Inc.
• RTNR — Real-Time Network Routing
• COIC — Central Office Interface Circuit
• ALIT — Automatic Line Insulation Test
• DQR — Directory enQuiry Restricted
• DMF — Distributed Messaging Fabric
• WXE — Wireless Exchange Engine
• TR — Temporal Reference
• WTF — Wireless Telecommunications Facility
• EPI — External Provisioning Interface
• MDCNZ — Monthly Demand Charge for Non-Zone network Load
• UNICODE — UNIversal trunk - out-of-service CODE
• ISD — Independent Segment Decoding
• AIOD — Automatic Identification of Outward Dialed calls
• DEN — Directory Enabled Networks
• RAMA — Resource Auction Multiple Access
• RIC — Radiocommunications Information Circular
• WLS — Wireless Location Services
• BASH-R — BAndwidth SHaring with Resource constraints
• ELL — Ethernet Leased Line
• WUPE — Wireless User Premises Equipment
• INSAT — India's Indian National Satellite
• M — Maintenance (Job Status)
• SPA — Service Planning Area
• TINA — Telecommunications Information Networking Architecture
• WND — Wireless Network Design
• DI — Document Index
• UBI — Usage Billing Information
• IDDD — International Direct Distance Dialing
• IS — Integrated Services
• COSMIC — common systems main interconnecting
• DSS — Digital Switching Subsystem
• DSRF — Device Savings Recovery Fee

• WBT — Wireless Business Technology
• DLS — Dual Line Signalling
• OMP — Operations and Management Platform
• SCC — Signal Conversion Circuit
• WACS — Wireless Access Communications System
• SYNTRAN — Synchronous Transmission
• RFI — Remote File Inquiry
• TESP — Telecommunications Enterprise Strategic Program
• T1 — Transmission service at the DS1 rate of 1.544 Mbps
• WAP — Web Access Phone
• PSU — Packet Switching Unit
• ACS — Accelerated Change Service
• DDCNZ — Daily Demand Charge for Non-Zone Network Load
• IDR — Installer Design Required
• ESMR — Enhanced Specialized Mobile Radiotelephony
• BLERT — Block Error Rate Test
• NIMA — National Imagery Mapping Agency
• PNA — Parallel Network Architecture
• STE — Signaling Terminal Equipment
• CSA — Central Service Area
• CTN — Community Telecommunications Network
• CHE — Central Head-End
• CSI — Clearing Subnetwork Identification
• SM — Statistical Multiplexing
• KLM — Keyboard Layout Management
• WUF — Wireless University Forum
• WLRL — Wireless LAN (Local Area Network) Research Laboratory
• WWTW — World Wide Telecom Web
• ESVN — Executive Secure Voice Network
• B911 — Basic 911 Emergency Service
• IMN — Intelligent Mobile Network
• UGC — UnderGround Communications
• CMP — Communications Module Processor
• NCOSE — National Council on Systems Engineering
• PCTF — Per-Call Test Failure
• RWF — Roaming Wireless Framework
• AS56 — Access System Centum 56 series
• IRTC — Illinois Rural TeleCommunication
• VRR — Videoconferencing Reservation Request
• CI — Customer Installation
• PIN — Positive-Intrinsic-Negative
• IUC — Interconnect Usage Charge
• FCOT — Fiber Central Office Terminal
• LDC — Long Distance Carrier
• OTA — Over-the-Air Activation
• SCC — System Control Center
• OC-36 — Optical Carrier Signal, Level 36
• AC — Always Connected
• JIS — Jurisdictional Interstate Service
• UTL — United Telecom Limited

• OTM — Object Transaction Manager
• WDP — Wireless Data Pool
• UMATS — University of Maryland Academic Telecommunication System
• WISE — Wireless Infrastructure Simulation Environment
• MNET — Minnesota's Network for Enterprise Telecommunications
• WTCP — Wireless Transport Control Protocol
• UMTS — Universal Mobile Telecom Surfwax
• ENFIA — Exchange Network Facilities for Interstate Access
• TCCL — Terminating Carrier Command Line
• NETS — Nationwide Emergency Telecommunications Service
• TSB — Telecommunications Systems Bulletin
• DLIS — Directory Listing Inquiry System
• BAC — Bar Calls
• FCA — Fixed Channel Assignment
• TTE — Telecommunications Terminal Equipment
• TVL — TELECOM VANUATU LIMITED
• WDDM — Wavelength-Division Demultiplexing
• ICAL — Interexchange Carrier Access Line
• CMS — Circuit Multiplication System
• CMI — Computer Managed Instituteuction
• LAS — Local Authentication Service
• TRNA — Temporarily Restricted Net Asset
• RU — Remote Unit
• FO — Fiber-Optic
• TSAPI — Telephony Services Application Programming Interface
• E-911 — Enhanced emergency telephone number
• ATLAS — Accessing Telecoms Links Across Scotland
• BC — Committed Burst Size
• TPE — Telephony Platform Engine
• CMM — Calls, Minimums, Maximums
• WNRC — Wireless Networks Research Center
• WIOP — Wireless Inter-ORB (Object Request Broker) Protocol
• ESFDL — Extended Super Frame Data-Link
• NAB — National Association Of Broadcasters
• ICR — Intelligent Call Routing
• OHD — Optical Heterodyne Detection
• MAP — Mobile Applications Port
• VRSM — Voltage, Ringing Signal Modified (inverted)
• SM-SC — Short Message Service Center
• AOS — Alternative Operator Services
• DSS — Digital Subscriber Signalling
• EOC — Embedded Operations Channel
• EVRC — Enhanced Variable Rate CODEC (CODer-DECoder)
• VNT — Very Nice Telephone
• BR — Basic Rate
• TMN — Telecommunications Management Network
• ECTEL — Eastern Caribbean TELecommunications Authority
• DTIS — Department of Telecommunications and Information Services
• CS — Customer Specification
• VFM — Voice Frequency Measurement

• HFK — Hands Free Kit
• THT — Total Handling Time
• ISM — Instrumentation Scientific and Medical
• WCS — Wireless Communications Service
• PVRA — Physical Volume Reserved Area
• RAPID — Remote Access Protocol Interface Device
• VQR — Voice Quality Rating
• CDR — Common Data Rate
• TU — Total Usage
• CS — Clear to Send
• BEP — Back-End Processor
• WWOM — Wireless Work Order Management
• LQE — Line Quality Engineering
• ADLI — Automatic Dial Line Identification
• VSR — Viking Single-line loud Ringer
• WCPE — Wireless Customer Premises Equipment
• NB — Narrowband
• DPO — Dial Pulse Originate
• WRRK — Wireless Router and Repeater Kit
• UG — User's Group
• SATRA — A Saudi Arabian Telecommunications Regulatory Authority
• VDS — Variable Department Sonar
• RATS — Radio-Amateur Telecommunications Society
• IVDT — Integrated Voice/Data Terminal
• CPP — Calling Party Pays
• TLX — TELEX (TELegraph EXchange)
• RLDI — Receive Line Data Input
• CSS — Customer Service System
• IR — Information Rate
• ATSC — Australian Telecommunications Standardization Committee
• SLS — Sidelobe Suppression
• WACM — Wide Area Communications Management
• SDB — Switched Digital Broadcast
• TOH — Transport Overhead
• CMRS — Commercial Mobile Radio Services
• WIPN — Wireless Internet Protocol Network
• ADTN — Agency Data Telecommunications Network
• NCA — Non-Call Associated
• DLC — Digital Line Controller
• UARS — Upper Atmospheric Research Satellite
• EDGE — Enhanced Data for GSM Evolution
• MEAS — Measured Extended Area Service
• AZDL — Adjusted Zonal Daily Load
• TEM — Telecom Expense Management
• NCP — Network Control Point
• TBR — Tagged Bit Rate
• NEBS — New Equipment Building Specifications
• CSL — Communication Services Limited
• CEP — Communication End Point
• DIAG — Diagnostics

• CHM — Changeover and Changeback Messages
• ICS — Intelligent Calling System ID Identification
• VAC — Voice Activity Compression
• BDS — Bundled Digital Services
• DSX-3 — Digital Stream Crossconnect 3 (44.736 Mbps)
• VSP — VoIP Service Partner
• LDL — Long Distance Link
• UTRA — Universal Terrestrial Radio Access
• IVAD — Integrated Voice and Data
• TLC — Text Link Cellular
• MLC — Multiple Level Cell
• TDP — Tag Distribution Protocol
• WACR — Wide Area Call Reception
• NOLM — Nonlinear Optical Loop Mirror
• WNQS — Wireless Network Quality Specification
• WPA — WiFi Protected Access
• TXE — Transmitter Empty
• EICS — EURESCOM Information and Communications Services
• VCE — Voice Clarity Enhancement
• WQOS — Wireless Quality of Service
• SLTE — Signaling Link Termination Equipment
• ADU — Accumulation and Distribution Unit
• LOP-L — Loss Of Pointer - Line
• WLS — Wait Listing Service
• LEO — Low-Earth-Orbit
• SU — super-user
• TOSL — Telecommunications Ombudsman Service Limited
• KTL — Killarney Telecommunications Ltd
• UI — Unnumbered Information (frame)
• DNMS — Dual Network Media Server
• QCIF — Quarter Common Image Format
• SAC — Syntax-based Arithmetic Coding
• CASE — Common Application Service Elements
• WBE — Wireless Business Engine
• CN — Calling Number
• RAST — Receive and Send Terminal
• PCL — Product Computing Module Load(s)
• DA — decanoic acid
• MCFI — Multiple number Call Forwarding Inhibit
• BETAG — Beginning-End Tag
• WEPD — Weighted Early Packet Discard
• SWAN — Structured Wireless Aware Network
• IA5 — International Alpha Set No. 5
• TIF — Telecommunications Infrastructure Fund
• VMIC — VME Microsystems International Corporation
• FOTP — Fiber Optic Test Procedures
• CS — Communications Satellite
• RTSE — Remote Transfer Service Element
• GTTI — Global Telecommunication Training Institute
• ADU — Analog-to-Digital Unit

• VRSP — Video Relay Service Provider
• GETS — The Government Emergency Telecommunications Service
• RTDC — Regional Telecommunication Development Conference
• GLD — German Long Distance
• BLERT — BLock Error Rate Tester
• LVC — Label Virtual Circuit
• XNS — Xerox Network System
• WRAN — Wireless Rural Area Network
• TTAC — Telecommunication Technology Advisory Committee
• FWT — Fixed Wireless Terminal
• VIDF — Vertical Intermediate Distributing Frame
• RBES — Rule-Based Expert Systems
• PNVS — Pilot Night Vision Sensor
• TLS — Telephone Line Simulator
• WIVA — Wireless Integrated Voice Access
• ITS — Institute for Telecommunication Sciences
• TELCO — Telecommunications Company
• MDCZ — Monthly Demand Charge for a Zone
• ANP — Autonomous Network Planning
• SNA — Systems Network Architecture
• ITW — International Telecoms Week
• SRB — Software Release Bulletin
• RWI — Real Wireless Intelligence
• CDM — Code Division Multiplexing
• TMAP — Technical Management Assistance Programme
• WEXK — Wireless EXit Kit
• DB — Dial Back
• COCOT — Customer Owned Coin Operated Telephone
• RRO — Regulated Rate Option
• WHM — Wireless Host Module
• PRAM — Parameter RAM
• RWN — Regional Wireless Networks
• MIS — Mobile Information Service
• WNIU — Wireless Network Interface Unit
• RI — Ring Interface
• FA — Failed Answer
• ECS — Emergency Communication System
• LAPD — Link Access Procedure D channel
• ACIS — Andy Charles Ians System solid modelling geometric engine
• CFU — Call Forward Unconditionally
• BLT — Bottom Line Telecommunications
• TSP — Telecom Service Provider
• HPNA — Home Phoneline Network Adapter
• BTS — Business Telecommunications Services
• THAAD — Theater High Altitude Area Defense
• VTPM — Virtual Terminal Protocol Machine
• KEY — Keyset (multiline phone)
• PAL — Phase Alternating by Line
• WTNG — World Telephone Numbering Guide
• UPPC — Up-Path Power Control

• MFR — Multi-link Frame Relay
• USLD — United States Long Distance
• MJC — Modular Jack Cable
• SMDF — Subscriber Maintenance Distributing Frame
• DNA — Daytime Nighttime Anytime
• WON — Wireless Optical Network
• EA — Emergency Action (JOC)
• UTFX — Unit Testing Framework - XSLT (Extensible Stylesheet Language Transformation)
• ASR — Automatic Send-Receive
• PTP — Personal Telco Project
• ERA — Enhanced Remote Access
• SHOE — Simple Hypertext Ontology Extensions
• BRITE — Basic Rate Interface Transmission Extension
• WHAT — Wireless Hybrid Asynchronous Time-bounded
• BT — British Telecom…
• LQI — Line Quality Indicator
• ADSRF — Additional Device Savings Recovery Fee
• TGPSI — Transmission Gap Pattern Sequence Identifier
• LDDS — Limited Distance Data Service
• MOM — Mainboard Operation Monitor
• P — Planning
• CBO — Call-Back Only
• DCPZ — Daily withdrawal coincident with Customer Peak for a Zone
• PIC — Pre-Subscribed Interexchange Carrier
• BYOP — Bring Your Own Portal
• SDN — Software-Defined Network
• TELEX — Teleprinter Exchange
• VCA — Voice Communications Adapter
• CRACK — Challenge Response for Authenticated Crypto Keys
• XA-SMDS — Exchange Access Switched Multi-Megabit Data Service
• GTSS — Global Telecom Solutions Sector
• CTUF — Cape Telecommunications Users Forum
• WWAT — Wireless Wide Area Telemetry
• CNA — Cell Not Available
• EMX — Earth and Magneto Signaling
• WWJ — Wireless Watch Japan (est. 2001)
• CPEB — Channel Partner Enablement Briefing
• WLAB — Wireless LAN (Local Area Network) Access Bridge
• WLLD — Wireless Local Loop Delivery
• ASR — Automatic Set Relocation
• MMT — Multimedia Multiparty Teleconferencing
• VCC — VSAT (Very-Small-Aperture Terminal) Control Center
• TSY — Telephony Server
• CSL — Create a Simple Life
• CCF — Custom Calling Feature
• ISUP — ISDN Service User Part
• TCM — Tandem Connection Maintenance
• HIDF — Horizontal Intermediate Distributing Frame
• WLAR — Wireless LAN (Local Area Network) Access Repeater
• RWL — RF (Radio Frequency) / Wireless Laboratory

• FSS — Fixed Satellite System
• NE — Network Entity
• GWCS — General Wireless Communications Service (46560 - 4685 MHz)
• GAT — GSM, AMPS, and TDMA
• DIP — Dialup Internet Protocol
• STPI — Stentor Telecom Policy, Inc.
• RBHC — Regional Bell Holding Company
• SNECS — Single National Emergency Call System
• STA — State Transport Authority
• ECG — English Cell Group
• ULQ — User Level Quality
• FCAPS — Fault, Configuration, Accounts, Performance, Security
• VON — Voice Over Network
• DUITS — Digital, Ubiquitous, Interoperable, Transparent and Secure
• T1 — 1,544 Mbits per Second line
• BT — Bluetooth Two
• ATP — Association of Telecom Professionals
• TLC — Telecommunication Link Controller
• WIAD — Wireless Integrated Access Device
• WN — Wireless Network
• MND — Multi-Number Dialer
• DMS — Digital Multiplex Switch
• WTIS — Wireless Telecommunications Information & Services
• RTX — Real Telephone eXchange
• DP — Dial Pulsing
• WMTP — Wireless Messaging Transfer Protocol
• WBCS — Wireless Business Communications Systems
• EDGE — Edhanced Data Rates for Global Evolution
• UCP — Universal Communications Platform
• FUNI — Frame (relay) User Network Interface
• WLN — WireLess Networking
• ARE — All Routes Explorer
• ULSI — Ultra Large-scale Integration
• FFC — Front-Facing Camera
• MDC — Monthly Demand Charge
• CSP — Callback Service Provider
• MFT — Metallic Facilities Terminal
• WMTS — Wireless Medical Telemetry Service
• TXC — Transmission Complete
• VQC — Vector Quantizing Code
• VMLA — Virtual Mobile Location Area
• PTC — Pots Tandem Centrex
• TISM — Telecommunication, Information Studies and Media
• WGIS — Wireless Geographical Information System
• CNA — Certified Novell Administrator
• WAP — Wireless Access Provider
• MMF — Microsoft Mail File
• EQ — Equal To
• UL — Upper Layer
• RES — Resident

• ECHI — External Call History Interface
• DCAT — DSL (Digital Subscriber Line) Customer Advocacy Team
• IWW — Internet World Wireless conference
• AM — Advance Mobile
• TSAPI — Telephony Server Application Programming Interface
• BCDMA — Broadband CDMA
• DV — Data and Voice
• WIXD — Wireless Internet eXpress Data Connection
• MPPP — Multilink Point-to-Point Protocol
• SLTS — Sri Lanka Telecom Services
• CWC — Center Weight Control
• IRMA — Interactive Remote Messaging Application
• ISBX — Internet Satellite Broadcast Exchange
• CTI — Computer Telephone Integration
• WNP — Wireless Number Portability
• NN — node number
• RPS — Reference Picture Selection
• ACC — Automatic Carrier Control
• UDTX — Universal Data Transceiver
• LSP — Local Support Provider
• ITNL — Indusind Telecom Network Ltd
• BGSA — Banded Geographical Service Area
• H0 — High-capacity ISDN channel operating at 384 kbps
• VMAC — Voice Mobile Attenuation Code
• SRU — Single Receiver Unit
• SS#7 — Signaling System # 7
• SVC — Signaling Virtual Channel
• T2R — Trusted Transaction Roaming
• SDP — Service Definition and Provisioning
• PAD — Packet Assembler-Disassemble
• APS — Affordable Portable Services
• VWO — Virtual Wire Operations
• VPLS — Virtual Private LAN (Local Area Network) Service
• SSD — Source-surface Distance
• DF — Data Frame
• WCM — Wireless Connection Manager
• USPRO — United States Product Data Association
• RASC — Radio Access System Controller
• WTPF — World Telecommunication Policy Forum
• DCN — Data Communications Network
• MBA — Message Body Authenticator
• IVD — Integrated Voice and Data
• CS — Carrier Sense
• AC — Armored Cable (electricity)
• RHE — Regional Head-End
• VMB — Voice Message Broadcasting
• EB — Expanded Basic
• TLWS — Trunk and Line Work Station
• VT — Virtual Tributary signal
• SPC — Service Provider Code

• NCSU — North Carolina State Universityrsity
• TSD — Transmission System Development
• CFA — Carrier Failure Alarm
• LR — Line Rate
• GDS — Generic Digital Services
• RLCI — Receive Line Clock Input
• CFO — Core Funded Organization
• RGC — Resource-Guaranteed Connection
• HCF — High Connection Failure
• WPMS — Wireless Protocol Management System
• WRI — Wireless Reader Interface
• RAT — Radio Access Technologies
• OTD — Open Terminal Directive
• WADS — Wireless Access Development System
• WLTG — Wireless LAN (Local Area Network) Technology Group
• RPE-LTP — Regular Pulse Excited - Long Term Prediction
• USITA — United States Independent Telephone Association
• AIP — Administrative Installation Point
• WICD — Wireless Interface Connection Daemon
• SS7 — Signalling System 7
• GTA — GEORGIA TELECOMMUNICATIONS ASSOCIATION
• HSOPA — High-Speed OFDM (Orthogonal Frequency Division Multiplexing) Packet Access
• ZFH — Novell ZENworks For Handhelds
• M-LEAD — Mouth Lead
• AMSI — Ameritech Message Signal Interface
• DLT — Double Leading Tone
• FOB — Forward on Busy
• RCE — Region Code Enhancement
• TSA — Terminating Switched Access
• AHT — Average Holding Time
• WDCX — Wideband Digital Cross-connect
• DC — Dry Circuit
• WECM — WebSphere Everyplace Connection Manager
• ACF — Admission Confirm
• UNS — Universal Numbering System
• SRP — Spatial Reuse Protocol
• DCU — Drum Control Unit
• WNL — Wireless Networks Laboratory
• ATZ — Attention: Reset modem
• WCFQ — Wireless Credit-based Fair Queueing
• WDDF — Wireless Data Delivery Function
• TLPU — Telecommunications Line Protector Unit
• IMS — IP (Internet Protocol) Multimedia Subsystem
• TIC — Talking In Confidence
• WNAR — Wireless Network Access Requirements
• EUCL — End User Common Line
• RWT — Receiver Wait Time
• DOS — data over signaling
• DRS — Dial Return System
• SLIM — Service Level Improvement Method

• AT — ATtention command
• HLB — Hierarchical Line Balancing
• WBIA — Wireless Broadband Internet Access
• IFLS — Inter-Frequency Load Sharing
• SS — Single Step
• RZ — Receive ZModem
• TPC — Transmit Power Control
• WACP — Wide Area Calling Plan
• STN — Satellite Telecommunications Networks
• ARP — Access Responsible Party
• WNRL — Wireless Network Research Laboratory
• DUNC — Dial-Up Networking Connection
• ACD — Apex Collaborative Dialing
• COPS — Caring Operators Personal Service
• WSI — Wireless Services Integration
• ET — Exchange Termination
• RII — Routing Information Indicator bit
• CNA — Called Number Authority
• DCR — Dropped Call Rate
• TUMS — Telephone and Utilities Maintenance System
• RPS — Really Poor Service
• RTRP — Regional Telecommunications Restructuring Project
• UNE-P — Unbundled Network Element - Platform
• WTS — Wireless Telecommunication Services
• BSM — Broadband Satellite Multimedia
• CTWU — Chunghwa Telecom Workers' Union
• DT — Dial Tone
• SSP — Secure Service Provider
• SWF-DS1 — SWitched Fractional Digital Signal 1 line
• RITS — Residential Information Technology Services
• ASLV — Augumented Satellite Launch Vehicle
• XDSL — x (any type of) Digital Subscriber Line
• SCC — Switching Control Center
• TL1 — Transaction Language One
• IAST — Industry Access Service Tariff
• CVSD — Continuously Variable Slope, Delta modulation
• IPOD — Internet Phone Over Data
• WTDC — World Telecommunications Development Conference
• WGS — Worldwide Geodesic System
• SS2 — Signalling System 2 (600/750 Hz tones)
• LE — Line Encryption
• CF — Coin First
• VFM — Voice/ Fax Module
• TICS — Telecommunications And Instructional Computing Support
• MLP — Multi-layer Perception
• SPTC — Swaziland Post and Telecommunications Corporation
• TCMS — Trunked Code Management System
• WAVE — Wireless Audio Visual Email
• WPMS — Wireless Pay phone Management System
• WLEC — WireLess Ethernet Converter

• UNP — UN-Published
• QRW — Quasi-Random Word
• SPV — Sound, Picture, Voice
• CID — Call Instance Data
• IRB — Instituteuction Reorder Buffer
• DAP — Demand Access Protocol
• TMAB — Telecom Managers Association of Belgium
• EPSCS — Enhanced Private Switch Controlled System
• VYP — Virtual Yellow Pages
• WTSF — Wireless Telecommunication Services Facilities
• DCT — Digital Cordless Telecommunications
• UMC — Ukrainian Mobile Communications
• SCRG — Servicing Carrier Reference Guide
• RDY/BSY — Ready/Busy
• VMW — Vertically Modulated Well
• TIRKS — Trunk Integrated Records Keeping System
• RYC — Returned Your Call
• MP — Management Processor
• ET — Emerging Technologies
• WP7 — Windows Phone 7
• SDTA — South Dakota Telecommunications Association
• TETRA — Trans-European Trunked RAdio
• WNA — Wireless Network Auburn
• VERT — Vertical (distribution frame)
• DCPNZ — Daily transmission Charge for Peak Non-Zone network load
• WCIT — World Conference on International Telecommunications
• DFA — Distribution Feeder Antenna
• SLT — Signaling Link Termination
• AV — AUTOVON
• RB — Randomized Block
• T — Tipper
• BC — Burst copy
• FDS — Filtering, Distributing, and Serving
• WCS — Wireless Communication Services
• VTAC — Vermont Telecommunications Application Center
• NAS — North American Standard
• SHIT — Single-Hop Infrastructure Transmission
• THP — Terminal Handler Process
• IKI — Institut Kosmitcheskikh Issledovanii
• WVAS — Wireless Value Added Services
• SILO — Signal Intercept from Low Orbit
• MFRM — Multi-carrier Flexible Radio Module
• WLIA — Wireless Location Industry Association
• PSN — Personal Subscription Number
• WCTG — Wireless Communications Technologies Group
• DA — Dodecanedioic Acid
• MAP — Management Assessment Program
• WNE — Wireless Network Experiment
• JLS — Just Lousy Service
• ZDL — Zonal Daily Load

• WIGLE — Wireless Geographic Logging Engine
• TOS — Terms Of Service
• BCP — Before Cell Phones
• WNPO — Wireless Number Portability Operations subcommittee
• CAPS — Common ISDN API Service
• RANN — Recorder ANNouncer
• SSS — Switching Subsystem
• UWT — United World Telecom
• IDDD — International Direct Dialing Designator
• VLDS — Very Large Data Storage
• VPF — Virtual Private Facility
• CPIC — Cost Per Inbound Call
• TW — TWinbrook (telephone exchange)
• CD — Connect Direct
• IPD — Intelligent Pulse Decoding
• EUS — End User Segment
• APTG — Amplifier Probe and Tone Generator Kit
• WIMC — Wireless Intelligent Mobile Communicator
• MLS — Mobile Location Services
• STX — Start of Transmission
• RTE — Run-Time Environment
• PVS — Pennisula Video Surveillance
• ICE — Information Content Exchange
• CTS — Cordless Telephone System
• PTCL — Pakistan TeleComunication Land-line
• WWTA — World Wireless Technologies, Asia
• CRA — Constant Rate Allocation
• SP — Single Purpose
• TNS — Telephone Notification System
• RSS — Remote Switching Sites
• WOSN — Wireless Optimization Service Node
• TELECOMMUTE — Telecommuters
• WFII — Wireless Facilities Information Infrastructure
• R — Rimorchio (trailer)
• CMM — Cable Management Module
• F — Flowability
• TBS — Telephone Billing Service
• WIPSC — Wireless Intelligent Personal Server Consortium
• WTEL — Wireless TELephony
• RTPB — Residential consumer Third Party Billing
• IDS — Information Directory Service
• WTFB — World Telecoms Financial Benchmarks
• WFUP — Wireless Fair Usage Policy
• CD — Channel Delay
• RSS — Remote Switching System
• CSM — Communications Services Management
• WWO — Wireless Work Order
• PTA — Pre-Transmission Audit
• VMUI — Voice Mail User Interface
• TMS — Time-Multiplexed Switch

• TRF — Transmit Reject Filter
• NMS — Network Management Service
• SWNI — Smart Wireless Network Interface
• TDR — Transaction Data Reports
• LQF — Line Quality Function
• WTNPA — Wireless Telephone Number Portability Act
• ITC — Interstate Telecommunications Cooperative
• WTID — World TELECOM Internet Day
• HBOS — High-Bandwidth Optical Services
• CSP — Custom SIM Profile
• SFS — Start of Frame Sequence
• GRT — Georgian Railway Telecom
• VODAFONE — Combined Voice, Data, Telephone:
• WT — Wireless Telephony
• VMR — Video Mail Retrieval
• VMES — Vehicle-Mounted Earth Station
• RUIM — Removable User Identification Module
• CF — Call Forward
• WCTB — Wireless Campus TestBed
• TNS — Terminating Noncritical Section
• SMI — Subsystem Multiplicity Indicator
• RR — Receiver Ready
• TTX — TeleTeXt
• WBA — Wireless Business Application
• CC — Connection Confirm
• WNI — Wireless Network Interface
• ISA — Innovative Slot Allocation
• WTSO — Washington Telecommunications Services and Operations
• WBBI — Wireless BroadBand Internet
• WTNO — Wireless Technologies and Network Overview
• RACE — Research into Advanced Communications in Europe
• TL — Telephone Lead
• PTML — Pakistan Telecommunications Mobile, LTD.
• DPE — Dollar Phone Enterprise
• CPI — Computer-PBX Interface
• RA — Return Alarm
• APTG — Academy for Professional TraininG
• CLID — Calling Line IDentifier
• XI — X Identification (frame)
• WCRM — Wireless Customer Relationship Management
• RCMAG — Recent Change Memory Administration Group
• ALS — Alternative Line Service
• ISD — Instituteuctional Systems Design
• TRD — Timed Release Disconnect
• WWRF — Wireless World Research Forum
• WBGK — Wireless BridGe Kit
• BP — Burst Period
• RAU — Residential Adaptor Unit
• WGX — WebPhone Gateway eXchange
• WLSM — Wireless LAN (Local Area Network) Springboard Module

• TBF — Telephone Band Filtering
• MWC — Multi-Way Calling
• CP — Charging Party
• TMR — Trunked Mobile Radio
• DD — Digit Directory
• MMS — Meteorological Measurement System
• FTFW — FactoryTalk For Windows
• WLSS — WireLess Select Switch
• FB — Framing Bit
• LW — Long-wavelength
• ROI — Return On Information
• SCAYNP — Someone Calls And You No Pay
• IMM — Interactive Mobile Media
• WIAX — WIreless Internet Access
• ACF — Advanced Communications Facility
• DCCX — Direct Circuit Control Exchange
• TBQ — Telecommunications Billing Question
• CENTREX — Central Office Exchange
• WTAI — Wireless Telephony Applications Interface
• UPMT — Universal Per-application Mobility management using Tunnels
• VINF — Vista INformation Solution
• WLA — WireLess Access
• AMS — Analog and Mixed Signal
• WFOC — Wireless Full Operational Capability
• SIP — Service Interface Point
• WICI — Wireless Innovations in Communications Initiative
• TACS — Total Access Communications Systems
• RSI — Repetative Strain Injury
• CAS — Carrier Activity Sensor
• TTS — Telephone Traffic Simulator
• MAPS — Maps Application Provisioning System
• TIP — Telecommunications Infrastructure Planning
• TCA — Telecom Computing Architecture
• TACS — Telephone Access Customer Satisfaction
• WNQ — Wireless Network Quality
• SVD — Simultaneous Voice and Data Processor
• SN — Station Number
• SRM — Short-Range Modem
• EMS — Element Management Service
• TDSA — TELCO (TELephone COmpany) Distribution Support Architecture
• UMTS — Unified Mobile Telecommunication System
• TAP — Telocator Alphanumeric Paging
• RCS — Radio Cluster Server
• TSB — Telecommunications System Bulletin
• VMY — Voice Mobility
• QPW — QUIKPAGER Wireless
• ATR — Advanced Telecommunications Research laboratory
• DCPV — Daily Customer Pool Volume
• VNTR — Variable Number Tandem Repeats
• BPS — Baud per Second

• SLLR — Single Line Loud Ringer
• SCPI — Standard Commands for Programmable Instituteuments
• BM — Maximum Burst size
• WFQ — Weighted Fair Queueing
• TFA — Toll Free Authorization
• WBSN — Wireless Broadband-Sharing Network
• QNL — QoS Networking Laboratory, Boston University
• ISC — Infrastructure Service Charge
• HN — Home Number
• TMO — Telecommunications Management Officer
• MAP — Manufacturers Application Protocol
• RALB — Resource All Busy
• WWCE — World Wide Cellular Extension
• RYP — Romanian Yellow Pages
• IMR — International Mobile Roaming
• COC — Carrier of Carriers
• WMBD — Wireless Media Broadcast Device
• SRP — Specialized Resource Point
• WBCT — Wireless Broadband Communications Technology
• HTI — Handoff Transfer Initiate
• SLC — Subscriber Line Concentrator
• VZP — Virtual Zapping Phone
• VQE — Voice-Quality Enhancements
• URQ — Unregistration Request
• QC — Quality Conversation
• TTFG — Telecommunications Technology Forecasting Group
• UTI — Union Internationale des Telecommunications
• C — Connection
• WWSI — Wireless Web Systems Integration
• VQI — Voice Quality Improvement
• UNLD — UNlimited Long Distance
• VO — Validation Office
• WRB — Wireless Receiver Box
• TLR — Traffic Line Remover
• OR — Office Regenerator
• TTE — Tallahassee Telephone Exchange
• MARS — Military Affiliated Radio System
• VCC — Virtual Call Center
• F — Farenheit
• WSP — Wireless Signal Processor
• RTNZ — Rate for Transmission service for a Non-Zone load
• SNAP — Subnetwork Access Point
• LSI — Loop Start Interface
• CP — Customer Premises
• VANS — Value Added Network Services
• WOQS — Wireless Operator Quarterly Service
• TTR — Touch Tone Required
• WCTP — Wireless Communication Transfer Protocol
• WIZ — Wireless Internet Zone
• RINO — Roaming International Network Operator

• WWZA — Wireless WorkZone Alliance
• B — Bits
• UMS — Universal Messaging System
• O — Oblique
• EPPR — Empty Packet Production Rate
• VA — Voice Activity
• UCC — Universal Connectivity Charge
• SEFL — Single-Ended Fault Locating
• WGEN — Wireless GENeration
• IAV — Images, Audio, Video
• O — Other
• ITR — Intelligent Text Retrieval
• AL — Alignment Level
• BT — Best Telecommunications
• ISUP — International Standards Telecommunications Union
• WLDD — Wireless Location-Dependent Data
• SA — Service Analysis
• TMC — Timeslot Management Channel
• WEWI — Wireline Electronic Weight Indicator
• BS — Basic Service
• NM — Network Manager (GSFC)
• ICE — Integrated Communications Environment
• GC — Global Communications
• BOT — Baseline of Text
• VIL — Voice Interconnect Link
• VMS — Virtual Machine System
• SCC — Service Connection Charges
• TMD — Trunk Main Distributing
• RPT — Reply Paid Telegram
• TAB — Tape Automated Bonding
• WRBB — Wireless Rural BroadBand
• ITP — Interdisciplinary Telecom Program
• WDSN — Wireless Distributed Sensor Networks
• ISM — Invocation State Machine
• LAW — Local Area Wireless
• SARS — Service Assistance Referral System
• ULLS — Unconditioned Local Loop Service
• TTD — Temporary Transmit Delay
• CI — CHARM Interface
• UA — Universal Access
• VQL — Vector Quantizing Level
• BS — Burst Selector
• TSI — Telecommunications Services Inc
• TTP — Third-Party Provider
• SG — Supergroup
• SLM — Signal Line Measurement
• TPSN — Triple Play Subscriber Network
• TELEX — TELegraph EXchange
• LTA — Leased Transport Area
• MCN — Mittweidaer CampusNet

• UKB — Universal Keyboard
• SOA — Service Order Administration
• ISI — Institute of Scientific Information
• TWT — Time Warner Telecom
• CSA — Carrier Servicing Area
• IPM — Interpersonal Messaging System
• FP — Full Period of service
• LTS — Laboratory for Telecommunication Sciences
• TPQ — Transmission Power Quality
• DB — Dropped Burst
• CAS — Combined Antennae Services
• SMC — Switch Management Center
• PSA — Protocol-Specific Annex
• SIO — Subscribers In Operation
• WNQR — Wireless Network Quality Review
• ITR — International Telecommunication Regulations
• TSL — Transaction Sublayer
• WLSE — Wireless LAN (Local Area Network) Solution Engine
• SMT — Secure Mobile Transfer
• PC — Process Control
• WUSI — Wireless Universal Strike Interface
• AMI — Alternate Mark Indicator
• SD — Signal distribution
• PWP — Plastic Wall Phone
• MLE — Metropolitan Line Extension
• TIE — Telephone Interconnect Expansion
• RTDF — Rural Telecomunication Development Fund
• TJR — Trunk and Junction Routing
• ETC — Eligible Telecommunications Carrier
• BTS — Best Transmission Second
• WIBR — WIreless gate BRidge
• RC — Rudy's Cellular
• TCT — Tin Can Technology
• RKB — Ring Knowledge Base
• WFZ — Wire Free Zone
• RTS — Real-Time Simulator
• DT — Dialup Terminal
• WRBS — Wireless Router Base Station
• TVM — T1 Voice Module
• SAM — System Administration Manager
• AU — Audio Units
• IVS — Interactive Video Services
• CTR — Carrier Telegraph Receiver
• CRT — Combined Rlogin and Telnet
• DM — Distributed Management
• WPCS — Wireless Personal Communications Services
• FT — Field Testing
• SE — Status Enquiry
• RIM — Remote Integrated Mulitplexor
• TSM — Telecommunications Systems Management

• QOB — Quality Of Burst
• TAC — Terminal Access Circuit
• RDN — Relative Distinguishing Name
• IAC — Install And Commission
• PSS — Phone Search Space
• PD — Power Distribution
• WTCD — World Telephone Card Databank
• TIRF — Telecoms Industry Regulatory Forum
• SAM — Sme Access For Mobile
• PST — Public Safety Telecommunications
• GTI — Graphics, Text, and Images
• SMS — Server Malloc (Memory ALLOCation) System
• CAT — Charges, Access, and Terms
• PTC — Pacific Telecommunications Council
• WTRN — Wireless Token Ring Network
• WHIW — Wireless Home Installation Wizard
• S — Subscriber
• RCVS — Recharge Card Voucher System
• TPS — Transmission Parameter Signalling
• CT — Channel Termination
• RC — Rating and Certification
• WNPD — Wireless Network Persistent Data
• NSC — Non-Standard Facilities Command
• CPP — Calling Party Pay
• CTM — Cellular Textphone Modem
• SDNB — Secondary DN Call Blocking
• WIEA — Wireless Internet Enterprise Application
• LCWN — LiveCache Wireless Network
• PSP — Payphone Service Provider
• FAST — Field Automated Subscriber Testing
• CF — Carrier Furnished
• FSS — Fixed Satellite Services
• SX — Simplex (one-way)
• DTS — Data Telecom Support
• WLDS — Wilkes Long Distance Service
• MB — Medium Band
• SLM — Signal Leakage Meter
• SCC — SuperComputer Center
• NACSIM — National Communications Security Information Memorandum
• FAS — Fals ansewring supervision
• SRD — Short Range Devices
• WMIP — Wireless-Mobility Integration Protocol
• WURST — Wideband, Uniform Rate, Smooth Truncation
• TDU — T1 Distribution Unit
• WIXC — Wireless Internet eXpress Connection
• WBOX — Wireless in a Box
• WCS — Wireless Coupon System
• LVZ — Line Variance Zero
• RO — Recieve Only
• WWYP — Westford Web Yellow Pages

• STC — Signaling Transport Converter
• WCOE — Wireless Center of Excellence
• WLHP — WireLess HeadPhone
• TIE — Telephone Interconnect Equipment
• AP — Applications Processor
• SAG — Subscription Assignment Group
• TC — Terminating Channel
• FPS — Fast Packet Switching
• SSG — Signalling Server Global
• RTA — Rapid Thermal Annealing
• DS — Data Service
• IPS — Instituteuctions Per Second
• TES — Telecom Electric Supply
• FC — Fiber Channel
• TS — Tip and Sleeve
• SCP — Service Commitment Period
• CAL — Connection Access License
• WWZ — Wireless Work Zone
• VIEW — Virtual Interface Environment Workstation
• CUA — Call Unit Autodialer
• FTW — France Telecom Wireless
• LG — Line Good
• EOC — End Of Contents
• UIQ — User Interface Quartz
• MBS — Meter Backflow Services
• TAP — Telecommunity Appalachian Project
• OC — Operations Channel
• TOPS — Terahertz to Optical Pulse Source
• RTB — Remote Telephone Bell
• SS4 — Signalling System 4 (2040/2400 Hz tones)
• STR — Synchronous Transmitter/Reciever
• ASB — Application-Specific Bit
• VWM — Virtual Wire Manager
• WIKS — Wireless Interactive Keypad System
• SPF — Summertime Phone Functionality
• ALS — Accounts Ledger System
• STS — Small Telephone System
• RCS — Real Communication Solution
• ESP — Electro-Selective Pattern
• CU — Copper Local Loop
• VTS — Virtual Talk Session
• RI — Ring Indicate
• TIM — Telecom Idea Management
• WRAPS — Wireless Remote Audio Perimeter Sharing
• AN — Accessory Number
• RAS — Remote Access Services
• SO — Serving Office
• MC — Make Call
• CTR — Covert Telephone Recording
• SB — Service Billing

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

Show More Results

100