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Computing & IT >> Telecom Abbreviations

Look through 4999 acronyms and abbreviations related to Telecom:

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

• ARP — Address Resolution Protocol (ATM)
• RTN — Regional Telecommunication Network
• ISO — In Search Of
• ISAR — Inverse Synthetic-Aperture Radar
• CU — See You
• RQMT — Requirement
• CR — Carriage Return
• RDF — Resource Description Framework
• TEMIP — Telecommunications Management Information Platform
• P&L — Profit and Loss statement
• IRC — Internet Relay Chat
• S X S — Step-by-Step
• RAEX — Roaming Agreement EXchange
• BPM — Beats Per Minute
• LED — Light-Emitting Diode
• EPA — Environmental Protection Agency (US)
• MAN — Metropolitan Area Network
• FIFO — First In, First Out
• XA-FR — Exchange Access Frame Relay
• COB — close of business (End of duty day)
• SD — Standard Deviation
• E-LEAD — Ear Lead
• CPU — Central Processing Unit
• PDF — Portable Document Format (created by Adobe Acrobat)
• X-OFF — Transmitter Off
• OC-256 — Optical Carrier Signal, Level 256
• WACN ID — Wide Area Communications Network IDentifier
• PDT — Pacific Daylight Time
• S-BCCH — Short Message Service Broadcast Control Channel
• C-NBAP — Common Node B Application Part
• A-KEY — Authentication key
• X-ON — Transmitter On
• CPE — Customer Premises Equipment
• B-ICI — Broadband Inter-Carrier Interface
• UAX 14 — Unit Automatic eXchange type 14
• DAHDI — Digium/Asterisk Hardware Device Interface
• PO — Purchase Order
• ATOM — Any Transport over MPLS (Multi-Protocol Label Switching)
• ZDBOP — Ziff-Davis Benchmark Operation
• UR — Your
• ISO — International Organization for Standardization
• FDIC — Federal Deposit Insurance Corporation
• QFSK — Quadrature Frequency Shift Keying
• PDR — Preliminary Design Review
• ASTM — American Society for Testing and Materials (Philadelphia, Pennsylvania)
• FEMA — Federal Emergency Management Agency
• IP — Internet Protocol
• LLC — Limited Liability Company
• F2F — Face To Face (also Meeting In Person)
• OC-18 — Optical Carrier Signal, Level 18

• QC — Quality Control
• ATTN — Attention
• RFP — Request For Proposal
• AC — Alternating Current
• GUI — Graphical User Interface (goo-ey)
• I.LINK — IEEE 1394, High Performance Serial Bus, implementation
• ISP — Internet Service Provider
• CDR — Critical Design Review
• VIP — Very Important Person
• CY — Calendar Year
• CSMA/CD — Carrier sense multiple access / collision detection
• M-CSI — Mobility management CAMEL (Customized Applications for Mobile network Enhanced Logic) Subscription Information
• D-NBAP — Dedicated Node B Application Part
• MOU — Memorandum of Understanding (an MOU between Food & Drug Administratin and a regulatory agency in another country allows mutual recognition of inspections)
• API — Application Programming Interface
• T-IC — T-interConnect
• AUP — Acceptable Use Policy
• SABGW — System Architecture Evolution Gateway
• IRR — Internal Rate of Return
• ACH — Automated Clearing House
• H323 — ANSI standard for format over IP
• OC-9 — Optical Carrier Signal, Level 9
• RFQ — Request For Quotation
• EST — Eastern Standard Time
• CCB — Change Control Board
• GSM — Global System for Mobile Communications
• WBS — Work Breakdown Structure
• EAP — Employee Assistance Program
• IPO — Initial Public Offering
• BRB — Be right back
• MLS — Microwave Landing System
• EDI — Electronic Data Interchange
• O&M — Operation and Maintenance
• CONG — Congestion message
• VC-ATOD — Virtual Clearinghouse on Alcohol, Tobacco and Other Drugs
• FAQ — Frequently Asked Questions (sometimes Pronounced Fak)
• T-CARRIER — Trunk Carrier
• PVT — Private
• CSMA — Carrier Sense Multiple Access
• CEO — Chief Executive Officer
• WTG — Way To Go
• C³CM — Command, Control and Communications Countermeasures
• MTBF — Mean Time Before Failure
• RF — Radio Frequency
• WB — Welcome Back
• BTU — British Thermal Unit
• ASCII — American National Standard Code for Information Interchange
• AMD — Advanced Micro Devices, Inc. (producer of computer chips)
• RPM — Revolutions Per Minute, (Rotations Per Minute)
• AFAIK — As Far As I Know

• ADSL — Asymmetric Digital Subscriber Line
• LCD — Liquid Crystal Display
• KBYTE — Kilobyte (103)
• TQM — Total Quality Management
• CV — Curriculum Vitae
• DOA — dead on arrival
• R&D — Research & Development
• VAZO — Violating All-Zero Octet
• SRAM — Static Random Access Memory (ess-ram)
• FET — Field Effect Transistor
• SMTP — Simple Mail Transfer Protocol
• ATM — Asynchronous Transfer Mode
• SME — Subject Matter Expert
• ABC — activity based costing
• VAT — Value Added Tax
• ASA — American Standards Association
• ECU — Electronic Control Unit
• CRT — Cathode Ray Tube (type of TV)
• SLA — Service Level Agreement
• MDF — Main Distribution Frame
• NPV — Net Present Value {economics}
• GIS — Geographic Information System
• 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
• AIR — Account Information and Refill
• ARPA — Advanced Research Projects Agency (made early internet)
• ICT — Information and Communication Technology
• VPN — Virtual Private Network (ATM)
• IRL — In Real Life
• PUHU — Pick Up Hang Up
• ASME — American Society of Mechanical Engineers
• MOB — Mobile
• MRI — Magnetic Resonance Imaging
• ACE — Access Control Entry
• AM — Ante Meridian
• EOM — End Of Message
• SOW — Statement Of Work
• HTTP — Hypertext Transfer Protocol
• ABI — Application Binary Interface
• DAM — Diagnostic Acceptability Measure
• COR — Carrier Operated Relay
• DBORS — Data Base of Records
• PDA — Personal Digital Assistant
• 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.
• EDS — Electronic Data Systems Corporation
• DARPA — Defense Advanced Research Projects Agency (US)
• EU — European Union (1994; formerly referred to as the EEC or EC)
• GATT — General Agreement on Tariffs and Trade (government)
• MIS — Management Information System (OSHA)
• GPS — Global Positioning System (ex-NAVSTAR)
• RFI — Request For Information. Sales department shorthand. Special priority when use in conjunction with RFN (see below).

• PCB — printed circuit board
• DSC — Differential Scanning Calorimetry
• ACK — Acknowledge (telecommunications; Cf. NAK)
• TBD — To Be Determined
• IVR — Interactive Voice Response (telephone technology)
• JV — Joint Venture
• WWW — World Wide Web
• DOD — United States Department of Defense
• ATA — Area Transportation Authority
• CSA — Canadian Space Agency
• CD — Compact Disc
• WML — Wireless Markup Language
• EIS — Executive Information System
• RQMTS — Requirements
• ADM — Add-Drop Multiplexer
• ESA — European Space Agency
• RDY — Ready
• RPI — Retail Price Index
• NPI — New Product Introduction
• SWAG — Scientific Wild Ass Guess
• NSF — National Sanitation Foundation
• VVX — Voice and Video eXchange
• CIO — Chief Information Officer
• RFO — Reason For Outage
• WWW3 — World Wide Web Consortium
• NYSE — New York Stock Exchange
• AOL — America on line
• CPM — Critical Path Method
• FIPS — Federal Information Processing Standard
• RAM — random-access memory
• D-H — Diffie-Hellman
• TNX — Thanks
• DSS — Decision Support System
• ADD — Addendum
• QMS — Quality Management System
• QA — Center for Quality Assurance in International Education
• CUG — Closed User Group
• CAE — Computer-Aided Engineering
• SDD — Software Design Document
• PDH — Plesiochronous Digital Hierarchy
• ISDN — Integrated Services Digital Network
• BBS — Bulletin Board System
• SAN — Storage Area Network
• EVP — Executive Vice President
• FAA — Federal Aviation Administration
• SAR — Search And Rescue
• ATCRBS — Air Traffic Control Radar Beacon System
• FX — Foreign Exchange
• DES — Data Encryption Standard
• JIT — Just in time

• AM — Amplitude Modulation
• AGC — Automatic Gain Control
• RFC — Request For Comment
• HVAC — Heating, Ventilation, and Air Conditioning
• PGP — Pretty Good Privacy (encryption)
• RDBMS — Relational Database Management System
• POP — Point Of Presence (Internet)
• COO — Chief Operation Officer
• IETF — Internet Engineering Task Force
• MST — Mountain Standard Time
• TTYL — Talk To You Later (Internet Slang)
• CAD — Computer Aided Designer
• AES — Advanced Encryption Standard
• CIR — Committed Information Rate (Frame Relay)
• SDR — Special Drawing Rights
• CRM — Customer Relationship Management
• DWDM — Dense Wavelength-Division Multiplexing
• TNYWR — The Number You Will Receive
• AE — Account Executive
• CGI — Common Gateway Interface
• MTTR — Mean Time To Repair
• CIS — Commonwealth of Independent States
• CC — Carbon Copy
• QOS — Quality of Service
• CDT — Central Daylight Time
• DAC — Discretionary Access Control
• ACM — Association for Computing Machinery
• IRS — U.S. Internal Revenue Service
• BCC — Blind Carbon Copy
• DNS — Domain Name System
• ACK — ACKnowledgment
• CBT — Computer Based Training
• BVR — Beyond Visual Range
• EEC — European Economic Community (predecessor of the European Union|EU)
• DRAM — Dynamic Random Access Memory (dee-ram) (computing)
• VM — Voice Mail
• PRI — Primary Rate Interface (ISDN)
• SAS — Statistical Analysis System
• OCR — Optical Character Recognition
• ACE — Advanced Computing Environment
• DHCP — Dynamic Host Configuration Protocol
• DBMS — Database Management System
• ATC — Air traffic control
• Q&A — Question & Answer
• ECO — Engineering Change Order
• EDT — Eastern Daylight Time
• SIC — Standard Industrial Classification (Code)
• GSA — U.S. General Services Administration
• DNS — Domain Name Service
• UDP — User Datagram Protocol (FDDI related)

• CST — Central Standard Time (UTC-6 Hours)
• SLIP — Serial Line Interface Protocol
• ROI — Return on Investment
• UPS — Ultraviolet Photoelectron Spectroscopy
• BR — Branch
• EFT — Electronic Funds Transfer
• SQA — Software Quality Assurance
• 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
• NATO — North Atlantic Treaty Organisation
• CB — Call Back
• ADR — Address
• UTC — Coordinated Universal Time
• FSAI — Fiber Serving Area Interface
• EC — European Commission
• AIS — Automated Information System
• PNG — Portable Network Graphics (graphic file standard/extension)
• ASP — Application Service Provider
• DOJ — Department of Justice (US)
• NIH — Not Invented Here
• WWW — World Weather Watch
• DSL — Digital Subscriber Line
• RM — Regional Manager
• NEC — National Electrical Code
• CAM — computer aided manufacturing
• PC — Personal computer (host)
• ABET — Accreditation Board for Engineering and Technology, Inc.
• NFS — Network File System
• EDVAC — Electronic Discrete Variable Automatic Computer
• TCO — Total Cost of Ownership
• CPT — Carriage Paid To
• UAV — Unmanned Aerial Vehicle
• CMS — Content Management System
• ACC — Adaptive Cruise Control
• MSN — Microsoft Network
• WAN — Wide Area Network
• DFD — Displaced Frame Difference
• DQPSK — Differential Quadrature Phase-Shift Keying
• 100BASE-T2 — 100 Megabits per Second, Baseband, Two-pair Category 3 UTP cables
• SCC — Standards Council of Canada
• PM — Preventive Maintenance
• SDMA — Space Division Multiple Access
• BPS — bits per second
• WYSIWYG — What You See Is What You Get (pronounced Wizzy-wig. See Entry For Derived Acronyms)
• LED — law enforcement desk; light emitting diode
• NIST — National Institute of Standards and Technology
• CFO — Communication Filing Officer
• DB — Decibel
• DDE — Dynamic Data Exchange (in software parlance)
• AOA — Angle Of Arrival
• MB — Megabyte

• ERP — Enterprise Resource Planning
• DLL — Dynamic Link Library (computer file)
• MBR — Master Boot Record
• UI — User Interface
• SBU — Strategic Business Units
• AQL — Acceptable Quality Level
• NOS — Network Operating System
• DDD — Direct Distance Dial
• FFT — Fast Fourier Transform
• CAA — Civil Aviation Authority
• RWR — Radar Warning Receiver
• AADC — Automated Area Distribution Center
• PST — Pacific Standard Time (UTC-8 Hours)
• ITU — International Telecommunication Union
• OFC — Office
• ROFL — Rolling on the floor laughing
• BST — British Summer Time
• AAAS — American Association for the Advancement of Science
• FCC — Federal Communications Commission (US)
• 9 — Nine
• BPR — Business Process Re-engineering
• CMM — Capability Maturity Model
• NTIS — National Technical Information Service Technology Administration
• ENIAC — Electronic Numerical Integrator And Computer
• SQL — Structured Query Language
• PMA — Physical Medium Attachment
• STP — standard temperature and pressure (0° and 1 atm)
• IP — Intellectual Property
• B2B — Business to Businesse
• PM — post meridian
• GPRS — General Packet Radio Service
• CLI — Command line Interface (Cabletron)
• NMR — Nuclear Magnetic Resonance
• IM — Instant Message
• RAID — Redundant Array of Inexpensive Disks
• EOT — End Of Transmission
• MLS — Multiple Listing Service
• KISS — Keep It Simple Stupid
• LRJ — Location Reject
• EBCDIC — Extended Binary Coded Decimal Interchange Code (pronounced Eb-see-dik) (cf. BCD)
• ROS — Return on Sales
• SCM — Supply Chain Management
• PERT — Program Evaluation and Review Technique
• AGP — Accelerated Graphics Port
• EEHO — Either End Hop Off
• OSHA — Occupational Safety and Health Act (1970)
• WDM — Wavelength Division Multiplexing (fiber optics)
• TNSTAAFL — There's No Such Thing As A Free Lunch
• DCOM — Distributed Component Object Model
• CCM — counter-countermeasure

• ZIP — Zone Improvement Plan
• DOS — Disk Operating System
• PECVD — Plasma-Enhanced Chemical Vapor Deposition
• CCSDS — Consultative/Consultative Committee for Space Data Systems
• SCSI — Small Computer System Interface
• HZ — cycles per second (hertz)
• APT — Automatic Picture Transmission
• EEG — Electro-EncephaloGram
• OMG — Object Management Group
• SOHO — Small Office Home Office
• CTD — Cumulative Trauma Disorder
• PDN — Public Data Network
• NA — Not Applicable
• ASEAN — Association of South East Asian Nations
• AT&T — American Telephone and Telegraph (U.S. company, also known as "Ma Bell")
• TC — Telephone Call
• JAXA — Japan Aerospace Exploration Agency
• AAAI — American Association for Artificial Intelligence's
• BSD — Berkeley Software Distribution
• CS — Computer Science
• DC — Direct Current
• DSA — Digital Signature Algorithm
• ISBN — International Standard Book Number (ISO 2108)
• ADT — Atlantic Daylight Time (UTC-3 Hours)
• ALC — Automatic Level Control
• WEP — Wired Equivalent Privacy
• AAC — Advanced Audio Coding
• ACL — Access Control List
• COQ — Cost Of Quality
• ERT — Emergency Response Team
• PSK — phase-shift keying
• BRI — Basic Rate Interface
• SEI — Software Engineering Institute
• ADPE — Automatic Data Processing Equipment
• AC — Access Control
• SOGA — Share of Gross Adds
• W3C — World Wide Web Consortium
• AATSR — Advanced Along-Track Scanning Radiometer
• FM — frequency modulation
• LMS — Learning management system
• PM — Project Manager
• UN — United Narions
• BIP — Bit-Interleaved Parity
• SAIC — Science Applications International Corporation
• CIA — Central Intelligence Agency
• AME — Amplitude Modulation Equivalent
• T&C — Terms & Conditions
• CUL — See You Later
• AT&T — American Telephone & Telegraph
• HW — Hardware

• AWG — American Wire Gauge
• Z — Zero
• ATN — Aeronautical Telecommunication Network
• DDL — Data Definition Language
• ESF — Extended Super Frame (ATM)
• MIPS — Millions of Instructions Per Second
• NTIA — National Telecommunications and Information Administration
• NEMA — National Electric Manufacturer's Association
• ISSN — International Standard Serial Number (ISO 3297)
• BT — British Telecommunications
• SVP — Senior Vice President
• CORBA — Common Object Request Broker Architecture
• VHF — Very High Frequency
• IANA — Internet Assigned Numbers Authority
• MMS — Multimedia Messaging Service
• BSOD — Blue Screen Of Death
• APPL — Application
• DCN — Design Change Notification
• HDML — Handheld Device Markup Language
• ISMI — International mobile subscriber identity
• RFD — Request For Discussion
• BUR — Bandwidth Usage Redundancy
• WMO — World Meteorological Organization (ICSU)
• DSSS — Direct Sequence Spread Spectrum
• DQE — Detective Quantum Efficiency
• OBO — Or Best Offer
• OM — Old Man
• WTO — World Trade Organisation
• EPR — Ethylene-Propylene Rubber
• DTI — Department of Trade and Industry (UK)
• DME — Distance Measuring Equipment
• DSCP — Differentiated Services Control Point
• ACTV — Active
• JPEG — Joint Photographic Experts Group (24-bit image storage format)
• SPC — Statistical Process Control. Forerunning quality theory from the 1960s to TQC and TQM.
• NIC — Network Interface Card
• NOAA — National Oceanic and Atmospheric Administration (US)
• ABR — Available Bit Rate
• PSTN — Public Switched Telephone Network
• ISS — International Space Station
• USGS — United States Geological Survey (DOI)
• ISAKMP — Internet Security Association and Key Management Protocol
• SSL — Secure Socket Layer
• ACD — Automatic Call Distributor
• SBC — Southwestern Bell Corporation
• SHA — Secure Hash Algorithm
• Y2K — Year 2000
• CCSD — command communications service designator; control communications service designator
• MHS — Message Handling System (electronic)
• LEO — Low Earth Orbit (satellite communications)

• ADN — Advanced Digital Network
• KM — Knowledge Management
• DTE — Data Terminal Equipment
• HTML — Hyper Text Markup Language
• ICANN — Internet Corporation for Assigned Names and Numbers
• ITSEC — Information Technology Security Evaluation Criteria
• SNMP — Simple Network Management Protocol (ATM)
• WIPO — World Intellectual Property Organization
• PBX — Private Branch eXchange (company phone system)
• EMG — Electromyogram
• EDD — Envelope Delay Distortion
• LEC — Local Exchange Carrier
• DMSP — Defense Meteorological Satellite Program (U.S.)
• SAE — Society of Automotive Engineers
• DLR — Design Layout Record
• BPRZ — Bipolar Return-to-Zero
• ASR — Airport Surveillance Radar
• EISA — Extended Industry Standard Architecture
• ECP — Engineering Change Proposals
• RM — Resource Management
• PT — Project Team
• EOB — End Of Business
• NAFTA — North American Free Trade Agreement
• EEPROM — Electrically Erasable Programmable Read-Only Memory
• VIRUS — Vital Information Resources Under Siege
• AD — Active Directory
• MRC — Monthly Recurring Charge
• FASB — Financial Accounting Standards Board
• CRBT — Caller Ring Back Tone
• CU — Control Unit
• AF — Audio Frequency
• STS — Space Transportation System
• 911 — Emergency Services Phone Number
• MIME — Multipurpose Internet Mail Extension
• PPB — parts per billion (109)
• VAC — Vacant
• FAR — Federal Aviation Regulation
• AFC — Automatic Frequency Control
• YL — Young Lady
• DC — Disconnected
• CRIS — Carrier Route Information System
• ASQC — American Society for Quality Control's
• CDR — Call-Detail Record
• WAP — Wireless Application Protocol
• RNC — Radio Network Controller
• M — Meter
• CMI — Computer Managed Instruction
• ADM — Add/Drop Multiplexer
• ARA — Apple Remote Access
• AES — Auger Electron Spectroscopy

• CM — Configuration Management
• EFF — Electronic Frontier Foundation
• TCP — Transmission Control Protocol
• USB — Universal Serial Bus
• RACON — Radar Beacon
• ECR — Electronic Cash Register
• CMD — Command
• RDP — Radar Data Processing
• ECE — Economische Commissie voor Europa (United Nations) (Dutch: Economic Commission for Europe)
• 100BASE-T — 100 Megabits per second, Baseband, Twisted pair
• LCP — Link Control Protocol
• MGMT — Management
• BUS — Business
• AMT — Amount
• AEC — Architecture, Engineering, Construction
• RFI — Radio Frequency Interference
• CRL — Certificate Revocation List
• MAC — Media Access Control
• EAP — Extensible Authentication Protocol
• CIS — CompuServe Information Service
• AVHRR — Advanced Very High Resolution Radiometer  
• CFE — Contractor-Furnished Equipment
• NRC — National Research Council (Canada)
• DSTE — Digital Subscriber Terminal Equipment
• NIST — National Institute of Standards & Technology (US)
• CCNA — Cisco Certified Network Associated
• SDH — Synchronous Digital Hierarchy (ATM)
• EW — Electronic Warfare
• AVL — Available
• DFS — Distributed File System
• NBS — National Bureau of Standards (US)
• UHF — Ultra High Frequency (300-3000 MHz; 1m-10cm)
• CIM — Common Information Model
• ROTFL — Roll On The Floor Laughing
• AYT — Are You There
• B2C — Business-to-Consumer
• RU — Are You?
• CRC — Contrôle de Redondance Cyclique (French: Cyclic Redundancy Check)
• SNR — Signal-to-Noise Ratio
• ATS — applications technology satellite
• BIS — Bureau of Indian Standards
• RSN — Real Soon Now [which may be a long time coming]
• AE — Application Entity
• WB — Write Back
• ASQ — Alpha System Qualification
• ELINT — Electronic Intelligence Satellite
• KHZ — kilohertz (1000 cycles per second)
• BJT — Bipolar Junction Transistor
• CMP — Connection Management Protocol
• NCSA — National Center for Supercomputing Applications

• PVC — Permanent Virtual Circuit (ATM)
• TV — Television
• ACPI — Advanced Configuration and Power Interface
• PABX — private automatic branch exchange (telephone)
• USD — United States Dollar
• BNSC — British National Space Centre
• NIMBY — Not In My Back Yard
• LF — Low Frequency
• FCA — Free Carrier
• ACT — ACTIVITY, ACTIVITIES
• LD — Long Distance
• CSO — Customer Service Operations
• CHAP — Challenge Handshake Authentication Protocol (ATM)
• VTC — Video Teleconference
• CW — Continuous Wave
• FTTB — Fiber To The Building
• APIC — Advanced Programmable Interrupt Controller
• D-RAM — Dynamic Random Access Memory
• ACO — Additional Call Offering
• EMS — Express Mail Service
• FDDI — Fiber Distributed Data Interface
• VR — Virtual Reality
• BCD — Binary-Coded Decimal
• IRS — Interface Requirements Specification
• DTX — Discontinuous Transmission
• PET — positron emission tomography
• BYOD — Bring Your Own Device
• NSA — National Security Agency
• CES — Consumer Electronics Show
• 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)
• PD — Public Domain
• RPC — Remote Procedure Call
• ECMA — European Computer Manufacturer's Association
• HSDPA — High-Speed Downlink Packet Access
• PE — Polyethylene
• MS — Millisecond
• BAN — Base Area Network
• TCP/IP — transmission control protocol/internet protocol
• FCS — Frame check sequence (Ethernet)
• SMS — Short Message Service
• HSD — High Speed Data
• ATM — Adobe Type Manager
• BIOS — Basic Input Output System
• TCB — Trusted Computing Base
• WORM — Write-Once, Read-Many
• AP — Application Protocol
• I/O — Input/Output
• IPVX — Internet Protocol version X
• BLOS — Beyond Line-Of-Sight
• CAUCE — Coalition Against Unsolicited Commercial Email

• DMA — direct memory access (computer term)
• BG — Background
• JST — Japan Standard Time
• CMC — Career Management Center
• C4 — Command, Control, Communications, and Computers
• DRM — Digital Rights Management
• RSVD — Reserved
• ISRO — Indian Space Research Organisation
• PLD — Programmable Logic Device
• EDP — Electronic Data Processing Plc (London Stock Exchange [LSE])
• SML/SMS — Service Management Layer/Service Management Service
• ICMP — Internet Control Message Protocol
• PDU — Protocol data unit (such as segment, packet, frame, etc.)
• RMS — root mean square (preferred over "RMS")
• TAG — Technical Advisory Group for Biological Control Agents of Weeds
• BER — Bit-Error Rate
• OS — Operating System
• ADT — Abstract Data Type
• RCU — Remote Control Unit
• RTU — Remote Terminal Unit
• PWD — Password
• ANI — Automatic Number Identification (Caller ID)
• QI — Quality Improvement
• LP — Low Pressure
• ISAS — Institute of Space and Astronautical Sciences (Japan)
• AMI — Advanced Metering Infrastructure
• EMC — Electromagnetic Compatibility
• ASK — amplitude shift keying
• PPP — Point-to-Point Protocol
• LQC — Line Quality Control
• SIG — Special Interest Group
• MBPS — Megabits per second
• IRDA — Infrared Data Association
• B3ZS — bipolar 3-zero substitution
• BBU — Baseband Unit
• MPLS — Multi Protocol Label Switching
• DOT — Department of Telecommunications (India)
• CFV — Call For Vote(s)
• VBR — Variable Bit Rate (ATM)
• ELF — Extremely Low Frequency
• AXE 10 — Series of electronic telephone exchanges from L.M. Ericsson
• EAI — Enterprise Application Integration
• SIT — Static Induction Transistor
• OSI — Open Systems Interconnection (iso Standard)
• NMT — Nordic Mobile Telephone
• GB — Gigabyte
• BOFH — Bastard Operator From Hell
• AIS — Alarm Indication Signal
• AT — Advanced Technology
• RFS — Request For Service

• DOM — Document Object Model
• CFD — Call For Discussion
• MMU — Memory Management Unit
• EGA — Enhanced Graphics Adapter
• MF — Medium Frequency
• SGML — Standard Generalized Markup Language
• CBC — cipher block chaining
• BS — Base Station
• MAC — Message Authentication Code
• QAM — quadrature amplitude modulation
• ADF — Automatic Direction Finder
• IEC — International Electrotechnical Commission
• SP — Service Provider
• YAHOO — You Are Hazy Over Oranges
• OSS — Operational Support System
• CIC — Circuit Identification Code
• SAR — Specific Absorption Rate
• CFD — computational fluid dynamics
• 3G — Third Generation mobile phone network
• PDS — Protected Distribution System
• HTTPS — HyperText Transfer Protocol Secure
• PAR — Precision Approach Radar
• PIN — Personal Identification Number
• MDA — Monochrome Display Adapter
• ADP — Automatic Data Processor
• AMHS — Automated Message Handling System
• MCD — Magnetic Circular Dichroism
• IMEI — International Mobile Equipment Identity
• ADC — Analog-Digital Converter
• RSVP — Resource Reservation Protocol (Internet)
• ESTEC — European Space Research and Technology Centre
• LDAP — Lightweight Directory Access Protocol (pronounced Ell-dap)
• ATF — Advanced Tactical Fighter
• CDMA — Code Division Multiple Access (voice/data transmission)
• BECN — Backward Explicit Congestion Notification
• VXML — Voice eXtensible Markup Language
• SLF — Super Low Frequency
• JIS — Japanese Industrial Standard
• LPE — Liquid Phase Epitaxy
• DSA — Directory System Agent
• DCMI — Dublin Core Metadata Initiative (Online Computer Library Center)
• SPC — Stored Program Control
• PCMCIA — Personal Computer Memory Card International Association
• CATV — Cable Television
• RIP — Routing Information Protocol
• CG — Coast Guard
• DMTS — Distinguished Member Of Technical Staff
• CGI — Computer-Generated Imagery
• APS — Automatic Protection Switching (SONET/SDH)
• CAD — Computer-Aided Design

• DSP — Digital Signal Processor
• CHF — Swiss Franc
• CCIS — Common Channel Interoffice Signaling
• CFA — Carrier Facility Assignment
• SOAP — Simple Object Access Protocol
• JPL — Jet Propulsion Laboratory (California Institute of Technology) (NASA)
• CBEMA — Computer & Business Equipment Manufacturers Association
• ACFQ — Absence Compensation Fair Queuing
• WPAN — Wireless Personal Area Network
• STA — State
• VB — Visual Basic
• VAS — Value Added Services
• DCE — Distributed Computing Environment
• GRE — Generic Routing Encapsulation
• CERT — Computer Emergency Response Team
• UPS — Uninterruptible Power Supply
• MIB — Management Information Base (ATM)
• AS — Autonomous System
• TOS — Type Of Service
• RACF — Resource Access Control Facility
• NAS — Network Access Server
• APC — American Power Conversion
• DUP — Duplicate
• TEL — Telephone
• OSPF — Open Shortest Path First (ATM)
• URI — Uniform Resource Identifier
• RH — Relative Humidity
• LR-WPAN — Low-Rate Wireless Personal Area Network
• CA — Certificate Authority
• 1000BASE-T — 1000 Megabits per Second, Baseband, Twisted Pair
• LF — Line Feed
• DASD — Direct Access Storage Device
• SCADA — Supervisory Control And Data Aquisition
• OLE — Object Linking and Embedding (Microsoft communication protocol)
• 100BASE-T4 — 100 Megabits per Second, Baseband, Four-pair Category 3 UTP cables
• COMINT — Communications Intelligence
• NOC — Network Operations Center
• UAS — Unavailable Seconds
• CG — Center of Gravity (DXS)
• ARG — Argument
• LCN — Logical Channel Number
• SXS — Step-By-Step
• DLC — Digital Loop Carrier
• MS — Mobile Station
• ASI — Asynchronous Serial Interface
• JSC — Johnson Space Center (Houston, TX)
• RCC — Rescue Coordination Center
• FCA — Free Carrier Absorption
• E — Echo Time Zone
• HDLC — High-Level Data Link Control

• TLS — Transport Layer Security
• TPDU — Transport Protocol Data Unit
• PRF — Pulse Repetition Frequency
• SIL — Speech Interference Level
• ERP — Enterprise Resource Management
• OCC — Occupancy
• MIS — Management Information Service
• RAD — Rapid Application Development
• SDM — Service Delivery Management
• PPARC — Particle Physics and Astronomy Research Council
• MTSO — Mobile Telephone Switching Office
• TTYL — Type To You Later
• VOL — Volume
• CIM — Corporate Information Management
• AR — Access Rate
• RAN — Radio Access Network
• MOS — Model Output Statistics
• WLAN — Wireless Local Area Network
• MS — Message Store
• TRLR — Trailer
• CIFS — Common Internet File System
• FCW — Federal Computer Week
• CATV — Community Antenna Television
• HF — High Frequency
• STM — Short Term Memory
• DIT — Directory Information Tree
• ITT — Invitation To Tender
• VDS — Variable Depth Sonar
• NESDIS — National Environmental Satellite, Data, and Information Service
• PCI — Peripheral Component Interconnect
• DNIS — Dialed Number Identification Service
• FTTH — Fiber To The Home
• ASTD — American Society of Training and Development (Alexandria, Virginia)
• SW — South West
• CAM — Computer-Aided Mapping
• OTN — Optical Transport Network
• BGP — Border Gateway Protocol (routing protocol)
• BPDU — Bridge Protocol Data Unit
• CAB — Conformity Assessment Body
• TAC — Technical Assistance Center
• MS — Management System
• DTR — Data Terminal Ready
• DS — Digital Signal
• VCC — Virtual Channel Connection (ATM)
• VLF — Very Low Frequency
• VOIP — Voice Over IP (Internet Protocol)
• PAN — Personal Area Network
• MDA — Model Driven Architecture
• LIU — Line Interface Unit
• MMSI — Maritime Mobile Service Identity

• ABBR — Abbreviation
• APM — Advanced Power Management
• UML — Unified Modeling Language (Object Management Group, OMG)
• EPR — Electron Paramagnetic Resonance
• MIC — Message Integrity Check
• SKU — Stockkeeping Unit
• SPA — Special Prorate Agreement
• FC — Fibre Channel
• NSAI — National Standards Authority of Ireland
• DIS — Distributed Interactive Simulation
• AMLCD — Active Matrix Liquid Crystal Display
• DSN — Deep Space Network - network of large antennas and communication facilities.
• RJ-14 — Registered Jack type 14 (2-wire connector)
• COO — Cost of Ownership
• YP — Yellow Pages
• NIC — Network Information Center
• ARPU — Average Revenue Per User
• ACR — Attenuation Crosstalk Ratio
• IMSI — International Mobile Subscriber Identity
• MVS — Multiple Virtual Storage
• CEV — Controlled Environment Vault
• EPABX — Electronic Private Automatic Branch Exchange
• IW — Information Warfare
• TB — Terabyte
• ISO — Independent System Operator (US) (see also TSO) Responsible for grid management, but does not own assets. (electricity)
• TKIP — Temporal Key Integrity Protocol
• OD — Outside Diameter
• DT — DWDM (Dense Wavelength Division Multiplexing) Terminal
• WAR — Weekly Activity Report
• ISO — Infrared Space Observatory
• POTS — Plain Old Telephone Service (FCW)
• LLC — Logical Link Control
• ME — Mobile Equipment
• AU — Audio Unit
• AFS — Andrew File System
• LZ — Landing Zone
• AT — Access Tandem
• DCS — Digital Cross-connect System
• OMS — Optical Multiplex Section
• DPC — Destination Point Code
• JVM — Java Virtual Machine
• IV — Initialization Vector
• WLTF — Wireless LAN (Local Area Network) Task Force
• KB — Kilobyte: One thousand and twenty-four bytes kbps kilo bit per second
• DID — direct inward dial
• DUC — Digital Up-Converter
• LLU — Local Loop Unbundling
• STI — Speech Transmission Index
• AFSK — Audio Frequency Shift Keying
• TIA — Telecommunications Industry Association

• CCTA — Central Computer and Telecommunications Agency
• ECPA — Electronic Communications Privacy Act 1986
• EEA — European Economic Area
• IS — International Standard
• CICS — Customer Information Control System (IBM Mainframe Software; Kicks Or C-I-C-S)
• IPX — Internetwork Packet Exchange
• CDS — Cell Directory Service
• PLMN — Public Land Mobile Network
• WAFB — Wireless Absolute Fairness Bound
• AMI — Alternate Mark Inversion
• DMX — De-MultipleXer
• PCM — Pulse-Code Modulation
• RARP — Reverse Address Resolution Protocol
• WG — Working Group
• HSS — Home Subscriber Server
• IMPACT — Integrated Manufacturing Precision Assembly Cellular Technology
• OAM&P — Operations, Administration, Maintenance & Provisioning
• TG — Task Group
• BRA — Basic Rate Access
• FR — Frame Relay
• TCSEC — Trusted Computer System Evaluation Criteria
• IS — Intermediate System
• EHF — Extremely High Frequency
• RT — Radiotelephone
• PAP — Password Authentication Protocol (ATM)
• TM — Technical Manual
• NCS — National Communications System
• MTU — Maximum Transmission Unit
• WMAN — Wireless Metropolitan Area Network
• PDN — Packet Data Network
• COM — Component Object Model
• NIS — Network Information Service
• ADCCP — Advanced Data Communications Control Procedures
• RDF — Radio Direction Finder
• ECN — Explicit Congestion Notification
• CRO — Central Records Office
• NOAO — National Optical Astronomy Observatories (Tucson, AZ)
• OMA — Open Mobile Alliance
• GHZ — Gigahertz
• CC — Country Code
• AEW — Airborne Early Warning
• VOC — Volatile Organic Compounds (air pollution)
• DA — Destination Address
• ARINC — Aeronautical Radio Incorporated
• ISA — Industry Standard Architecture
• IMC — Intermediate Metal Conduit
• RSRQ — Reference Signal Received Quality
• MCSD — Microsoft Certified Solution Developer
• NOTAM — Notice to Airmen
• FAX — Facsimile

• CCD — Charge Coupled Device - a device for the movement of electrical charge.
• SPGA — Staggered Pin Grid Array
• AIFF — Audio Interchange File Format
• SDK — Software Development Kit (Microsoft)
• E — Energy
• IIS — Internet Information Services
• EMR — Electromagnetic Radiation
• APN — An Access Point Name
• ASIC — application-specific integration circuit
• CO — Certificate of Origin
• 10BASE-T — 10 Megabits per second, Baseband, Twisted pair
• DDCMP — Digital Data Communications Message Protocol
• ARIN — American Registry for Internet Numbers
• FAT — File Allocation Table
• NLM — National Library of Medicine (National Institutes of Health)
• RJ-25 — Registered Jack type 25 (6-wire connector)
• BER — Basic Encoding Rules (ASN.1)
• YABA — Yet Another Bloody Acronym
• DDS — Digital Data Service
• EAC — Engineering Accreditation Commission
• MHS — Microwave Humidity Sounder
• 2W — Two Wire
• SEM — Space Environment Monitor
• ASR — Automatic Speech Recognition
• TDOA — Time Difference Of Arrival
• NFPA — National Fire Protection Association
• CBDS — Connectionless Broadband Data Service
• SVC — Scalable Video Coding
• VM — Virtual Machine
• OAS — Organization of American States
• DIBL — Drain-induced Barrier Lowering
• MME — Mobility Management Entity
• SSM — Source-Specific Multicast
• SCTP — Stream Control Transmission Protocol
• CLNP — ConnectionLess-mode Network Protocol
• OTS — Optical Transmission Section
• AOI — Area Of Interest
• IEEE-SA — Institute of Electrical and Electronics Engineers - Standards Association
• CS — Cable Select
• DAP — Directory Access Protocol
• CAV — Constant Angular Velocity
• NMS — Network Management System
• CAC — Carrier Access Code
• ECT — Explicit Call Transfer
• CPN — Cisco Powered Network
• PTP — Point to Point Transmission Service (electricity)
• IRLAN — Infrared LAN
• GOS — Grade Of Service
• CSA — Canadian Standards Association (like UL)
• CPS — Cycles Per Second (now Hertz)

• LSF — Line Spread Function
• CGM — Computer Graphics Metafile
• AML — Amplitude Modulated Link
• BSA — Business Software Alliance
• EC — European Community
• PKI — Public Key Infrastructure (cryptography)
• MCU — Multipoint Control Unit
• ESS — Electronic Switching System
• UA — User Agent
• RCV — Receive
• ES — Errored Second
• CBP — Coded Block Pattern
• ADEOS — ADvanced Earth Observing Satellite (Japan)
• DVMRP — Distance Vector Multicast Routing Protocol
• PAL — Programmable Array Logic
• MMB — Middle Mouse Button
• BT — BlueTooth
• ATSR — Along-Track Scanning Radiometer
• ISI — Inter-Symbol Interference
• COMJAM — Communications Jamming
• RTS — Request To Send
• GDM — GSM (Global System for Mobile communications) Data Module
• ADL — Advanced Distributed Learning
• FCP — Fibre Channel Protocol
• CF — Compact Flash
• HDSL — High-bit-rate Digital Subscriber Line
• MSRN — Mobile Station Roaming Number
• RCS — Radar Cross Section
• LPC — Linear Predictive Coding
• CABS — Carrier Access Billing System
• ARQ — Automatic Repeat-reQuest
• WPM — speech--words per minute
• WS — Workstation
• CAN — Campus Area Network
• EX — Exercise
• NLMS — Normalized Least Mean Square
• FXO — Foreign Exchange Office
• MCA — Micro Channel Architecture
• LSR — Local Service Request
• VOD — Video On Demand
• FEC — Forward Error Correction
• NTFS — New Technology File System
• VLL — Virtual Leased Line
• SVD — Singular Value Decomposition
• MPEG — Motion Picture Experts Group
• IRQ — Interrupt Request
• IDT — Integrated Digital Terminal
• NE — North-East
• ZIP — Zone Information Protocol
• MSU — Microwave Sounding Unit

• MC — Message Center
• 3GPP — Third Generation Partnership Project
• UAN — Universal Access Number
• ADF — automatic document feeder
• RP — Reference Point
• CC — Call Control
• MAJ — Major
• AAF — Advanced Authoring Format
• CAVE — Cellular Authentication and Voice Encryption Algorithm
• BS — Beam Splitter
• EGP — Exterior Gateway Protocol
• ODBC — Open Database Connectivity
• AMPS — Advanced Mobile Phone System
• DX — Duplex
• MIT — Massachusetts Institute of Technology (U.S.)
• EMS — Enhanced Messaging Service
• COAX — Coaxial
• ABN — Abnormal
• DRFM — Digital Radio-Frequency Memory
• ECAC — European Civil Aviation Conference
• STP — Spanning Tree Protocol
• BOC — Bell Operating Company
• RSS — Really Simple Syndication
• KDC — Kerberos Key Distribution Center
• AAV — Accountholder Authentication Value
• M — Management
• TCR — Temperature Coefficient of Resistance
• DDN — U.S. Defense Data Network
• TE — Traffic Engineering
• RRN — Routing Recording Number
• CTS — Clear To Send
• WTLS — Wireless Transport Layer Security
• F — Fellow
• AFP — AppleTalk Filing Protocol
• SHF — Super High Frequency
• ATS — Automatic Transfer Switch
• DSS — Digital Signature Standard
• ELT — Emergency Locator Transmitter
• TWT — Traveling Wave Tube
• ESF — Edge Spread Function
• FUP — Fair Use Policy
• GDS — Global Distribution System
• NI — Network Interface
• B-ISDN — Broadband Integrated Services Digital Network
• SPADATS — Space Detection And Tracking System
• SLP — Service Location Protocol
• TS — Technical Specification
• SATAN — Security Administrator Tool for Analyzing Networks
• OLAP — Online Analytical Processing
• DCP — Design Change Package

• ACAP — Application Configuration Access Protocol
• PUB — Publication (file name extension)
• MD — Mediation Device
• CD — Critical Dimension
• NCP — Network Control Protocol
• ASR — Access Service Request
• BERT — Bit Error Rate Tester (telecommunication)
• NNTP — Network News Transfer Protocol
• SM — Senior Member
• AMSS — Automatic Message Switching System
• AAS — Adaptive Antenna System
• TOP — Technical Office Protocol
• P — Predicted
• WCDMA — Wideband Code Division Multiple Access
• HEHO — Head End Hop Off
• UL — Uplink
• WK — Week
• DCN — Disconnect
• FMC — Fixed Mobile Convergence "Mobile UC or Unified Communications over Wireless"
• PSD — Phase-Sensitive Detector
• CU — Channel Unit
• E&M — ear and mouth (special signaling leads)
• SDLC — Synchronous Data Link Control
• AMR — Automated meter reading also known as Automatic Meter Reading
• LEN — Line Equipment Number
• TO — Technical Order
• BCH — Binary Coded Hexadecimal
• SDHLR — Super-Distributed Home Location Register
• SA — Scientific American
• MCC — Mission Control Center (JSC)
• TEC — Total Electron Content
• EMCON — Electromagnetic Emission Control
• DID — data item description
• SDP — Session Description Protocol
• MSE — Mobile Subscriber Equipment
• TELECOMMUTE — Telecommuting
• DMARC — Demarcation point
• OSTP — Office of Science and Technology Policy
• AFM — Atomic Force Microscopy
• SBC — Session Border Controller
• DSLAM — Digital Subscriber Line Access Multiplexer (Module)
• MPI — Message Passing Interface
• ARC — Army Reuse Center
• IN — Intelligent Network
• TI — Time Interval
• POE — power over ethernetinjector
• SYM — Symmetric
• QPSK — aeronautical quadrature phase shift keying
• CSAT — Customer Satisfaction
• CDA — Command and Data Acquisition

• HSCSD — High-Speed Circuit-Switched Data
• SMI — Structure of Management Information
• BACP — Bandwidth Allocation Control Protocol
• EMS — Element Management System (ATM)
• YYP — Yahoo Yellow Pages
• VOP — Voice Over Packet
• OTA — Office of Technology Assessment (U.S.; abolished by Congress, Fall 1995)
• SOS — Save Our Souls (Help!)
• PTA — Pakistan Telecommunication Authority
• SAR — synthetic aperture radar (satellite)
• ITP — Interactive Telecommunications Program
• TCPA — Telephone Consumer Protection Act
• SPI — Service Provider Interface
• IP — Intelligent Peripheral
• LRC — Learning Resource Center
• SONET — Synchronous Optical Network
• CT — Computer Telephony
• ECM — Electronic Counter Measures
• TBD — To Be Decided
• STP — Signal Transfer Point
• ADT — American District Telegraph Company
• IAB — Internet Architecture Board
• PIM — Personal Information Manager
• ACT — Activity
• DSN — Defense Switched Network
• CSPRM — Common Signaling Protocols Resource Module
• PDC — Personal Digital Cellular
• CO — Central Office
• ORB — Object Request Broker
• TLC — The Learning Channel
• ACLR — Adjacent Channel Leakage Ratio
• FSK — Frequency-Shift Keying
• STK — Satellite Tool Kit
• FA — Functional Area
• DIS — Draft International Standard
• LNP — Local Number Portability
• LEP — Large Electron Positron
• DTD — Document Type Definition (XML)
• TDMA — Time Division Multiple Access
• 4W — Four-Wire
• TXM — Transmission X-ray Microscope
• PGA — Programmable Gate Array
• ADB — Apple Desktop Bus
• EAS — Extended Area Service
• VRML — Virtual Reality Modeling Language
• KAK — Key-Auto-Key
• NSS — Network Switching Subsystem
• NE — Network Element
• IS — Information System
• SCP — Service Control Point

• SLAM — Scanning Laser Acoustic Microscope
• PROM — Programmable Read-Only Memory
• EIP — Equipment installation procedure
• ACF — Access Control Field
• SRS — Software Requirements Specifications
• TOS — Temporarily Out of Service
• IEEE-CS — Institute of Electrical and Electronics Engineers Computer Society
• CPS — characters per second
• CMT — Cadmium Mercury Telluride
• HEX — Hexadecimal (base 16)
• ROSAT — Roentgen Satellite
• SML — Service Management Layer
• TE — Terminal Equipment
• EFS — Encrypting File System
• FITS — Flexible Image Transport System
• WWAN — Wireless Wide Area Network
• NCSC — National Computer Security Center (NSA)
• FR PVC — Frame Relay Permanent Virtual Connection
• NRPB — National Radiological Protection Board
• CDE — Common Desktop Environment
• SD — Software Development
• OC — Optical Carrier
• ISOC — Internet Society
• B6ZS — Bipolar 6 Zero Substitution
• BIU — Bus Interface Unit
• CFNRY — Call Forwarding on No Reply
• VGA — Video Graphics Array
• NTP — Network Time Protocol
• DBS — Direct Broadcast Satellite
• TN — Telephone Number
• CAL — Calorie
• DII — Defense Information Infrastructure
• JCL — Job Control Language
• TRMM — Tropical Rainfall Measuring Mission (US-Japan)
• BELLCORE — Bell Communications Research, Inc.
• JTF — Joint Task Force
• AP — access point
• VC — Virtual Channel
• PVD — Physical Vapor Deposition
• STN — Station Casinos, Inc.
• IESG — Internet Engineering Steering Group
• DCS — Digital Cross-Connect
• MSR — Microwave Scanning Radiometer
• AUI — Attachment Unit Interface
• FLM — First Line Maintenance
• LU — Logical Unit
• CODASYL — COnference on DAta SYstems Languages
• LT — Line Termination
• AUD — Audit
• WWAN — wireless wide-area network

• Y — Yttrium
• LQR — Linear Quadratic Regulator
• TOA — Time Of Arrival
• MLP — Mobile Location Protocol
• BIP — Band Interleaved by Pixel
• CAMA — Centralized Automatic Message Accounting
• ATC — Advanced Technology Center
• PEM — Privacy-Enhanced Mail
• VSAT — Very Small Aperture Terminal (satellite service)
• MP — Multilink Protocol
• SITA — Société Internationale de Télécommunications Aéronautiques
• BOD — Bandwidth on Demand
• PUK — PIN (Personal Identification Number) Unlocking Key
• JRE — Java Runtime Environment
• SUS — Suspension
• DSCP — Differentiated Services Code Point
• FE — Finite Element
• DVP — Digital Voice Privacy
• DID — Digital Information Display
• CAPS — Call Attempts Per Second
• Y — Yes
• CAC — Connection Admission Control (Asynchronous Transfer Mode)
• FAA — Federal Aviation Agency
• MUSIC — MUltiple SIgnal Classification
• LFACS — Loop Facility Assignment and Control System
• 4GL — Fourth-Generation Language
• 4 GIG — 4 Giga Intellectual Gadget
• JDK — Java Development Kit
• SVC — Switched Virtual Connection
• FE — Far End
• FEP — Front End Processor
• DISA — U.S. Defense Information Systems Agency
• CI — Common Interface
• DAT — Digital Audio Tape
• TTY — Teletype Telex Machine
• CTU — Central Terminal Unit
• WINS — Windows Internet Name Service
• CBR — Constant Bit Rate
• B2B — Business-to-Business
• DNIC — Data Network Identification Code
• VLSI — Very-Large-Scale Integration
• IRS — Inertial Reference System
• TPC — The Phone Company
• EIGRP — Enhanced Interior Gateway Routing Protocol
• EIA — Extended Interaction Amplifier
• FWA — Fixed Wireless Access
• DAL — Dedicated Access Line
• RT — Remote Terminal
• EULA — End User License Agreement (usually in reference to software)
• AIN — Advanced Intelligent Network

• DW — Deep Water
• EST — Establish
• ETS — European Telecommunication Standard
• CVD — Chemical Vapor Deposition
• TDM — Time Division Multiplexer
• TRM — Technical Reference Model
• SCN — Switched Circuit Network
• WPS — Wireless Priority Service
• OPC — Originating Point Code
• MCP — Microsoft Certified Professional
• ECP — Encryption Control Protocol
• A — Anode
• TTL — ToS and Time-to-Live
• AMPS — Advanced Mobile Phone Service (cellular phone standard)
• SEC — Software Engineering Center
• TCIC — Trunk Circuit Identification Code
• CODEC — Coder/decoder
• IEEE — Institute of Electrical and Electronics Engineers
• 1-ESS — x-ESS series of Electronic Switching Systems
• AWACS — Airborne Warning And Control System
• SAN — System Area Network
• BTAM — Basic Telecommunications Access Method
• SLIP — Serial Line Internet Protocol
• PDS — Planetary Data System
• NREN — National Research and Education Network
• 1FB — Single line, Flat Business rate;
• ACC — Area Control Center
• WHT — Walsh-Hadamard Transform
• RAU — Radio Access Unit (Army)
• TDD — Telecommunications Device for the Deaf
• MEID — Mobile Equipment Identifier
• CER — Cell Error Ratio
• STN — Station
• DEC — Decimal
• ARPANET — ARPA Network
• WAIS — Wide Area Information Server
• CNM — Customer Network Management
• HLR — Home Location Register
• IPOATM — Internet Protocol over ATM
• ISM — Industrial, Scientific and Medical
• TE — Test Equipment
• RA — Risk Analysis
• EMEA — Europe, Middle East and Africa
• COPS — Common Open Policy Service
• OT — Office of Telecommunications
• ASARS — Advanced Synthetic Aperture Radar System
• LISP — List Processing Language
• AFOSR — Air Force Office Of Scientific Research(USA)
• SINAD — SIgnal-to-(Noise And Distortion) ratio
• BHCA — Busy Hour Call Attempt

• COMDEX — Computer Dealers Exposition
• BTC — Botswana Telecommunications Corporation
• DCE — Data Communication Equipment
• TL1 — Transaction Language 1
• DMS — Data Management System
• MOL — Manned Orbiting Laboratory
• GSM — Groupe Speciale Mobile
• BNC — Bayonet Neill-Concelman
• FTAM — File Transfer Access and Management
• BIS — Business Information System
• DL — Digital Library
• UTP — unshielded twisted pair
• E2E — End-to-End
• SPD — Serial Presence Detect
• ASN.1 — Abstract Syntax Notation One
• SMB — Server Message Block
• MX — Mixer
• IAD — Integrated Access Device
• NDVI — Normalized Difference Vegetation Index
• VMS — Virtual Memory System
• DCS — Digital Cellular System
• CIAC — Computer Incident Advisory Capability
• NNM — Network Node Manager
• C — Cost
• DN — Distinguished Name
• SL — Single Line
• DER — Distinguished Encoding Rules
• FEXT — Far-End Cross Talk
• VT — Virtual Terminal
• PIC — Peripheral Interface Controller
• TMSI — Temporary Mobile Subscriber Identity
• VF — Voice Frequency
• RSS — root-sum-square
• EMI — Electro-Magnetic Interference
• AN — Access Node
• RLU — Remote Line Unit
• RGN — Region
• CLEC — Competitive Local Exchange Carrier
• B3G — Beyond Third Generation
• GBPS — Gigabits per second
• DUA — Directory User Agent
• BAN — Billing Account Number
• EBS — Electron Bombarded Silicon
• VBA — Visual BASIC for Applications
• ATA — Analog Telephone Adapter
• RMI — Remote Method Invocation
• ASE — Application Service Element
• ETSI — European Telecommunications Standard Institute
• ADN — Abbreviated Dialing Number
• EBCDIC — Extended Binary-Coded Decimal Interchange Code

• MOD — Modify
• PDT — Portable Data Terminal
• TELNET — Telecommunications Network Protocol
• QI — Quality Indicator
• METRO — Metropolitan
• SMPTE — Society of Motion Picture and Television Engineers, Inc.
• RACH — Random Access Channel
• IRTF — Internet Research Task Force
• DPL — Digital Private-Line
• QDR — Quad Data Rate
• NAT — Network Address Translation
• SMDS — Switched Multimegabit Data Service (ATM)
• TTY — teletype terminal
• IDF — Independent Distribution Frame
• MRT — Medical Response Team
• DCS — Data Collection System (NOAA Polar Orbiting Satellites)
• CLETS — California Law Enforcement Telecommunication System
• IAT — Integrated Access Terminal
• ASDE — Airport Surface Detection Equipment
• TDD — Time Division Duplex
• FEM — Finite Element Method
• TSR — Telecommunications Service Request
• LT — Less Than
• MTP — Message Transfer Part
• DC — Display Controller
• BLER — Block Error Rate
• BCDIC — Binary Coded Decimal Interchange Code
• PE — Probable Error
• DL — Data Link
• SIL — Solid Immersion Lens
• TFTP — Trivial File Transfer Protocol (ATM)
• CRLF — Carriage-Return Line-Feed
• CB — Common Battery
• RT — Response Time
• LPD — Low Probability of Detection
• NIC — Network Interface Controller
• IV&V — independent verification and validation
• SA — Source Address
• SPA — Software Publishers Association
• FTNS — Fixed Telecommunications Network Services
• PM — Phase Modulation
• DVB — Digital Video Broadcasting
• PG — Page
• ASA — Acoustical Society of America
• SWAP — Shared Wireless Access Protocol
• VPI — Virtual Path Identifier
• CSPDN — Circuit Switched Public Data Network
• COAM — Customer Owned And Maintained
• PP — Polypropylene
• DPDU — Data Protocol Data Unit

• OTDOA — Observed Time Difference of Arrival
• MBWA — Mobile Broadband Wireless Access
• CDR — Clock and Data Recovery
• AM — Activity Manager
• AIT — Automatic Identification Technology
• DS-0 — Digital Signal, Level 0
• CNG — Fax Calling Tone
• DEMUX — Demultiplexer
• REA — Rural Electrification Administration (US)
• FEP — Front-End Processor
• Q — Quadrature
• 2W — 2-Wire
• SDSL — Symmetric Digital Subscriber Line
• DPL — Digital Power Line
• OOP — Object-Oriented Programming
• EFIS — Electronic Flight Information System
• LRC — Longitudinal Redundancy Check
• TTY — Text Teletype
• RMS — Resource Management System
• NPA — Numbering Plan Area
• IMAP — Internet Mail Access Protocol
• SDP — Software Development Plan
• BCH — Bose-Chaudhuri-Hocquenghem Coding
• POP — Post Office Protocol
• CVR — Crystal Video Receiver
• CCIR — International Radio Consultative Committee (French Acronym)
• OWS — Operator Work Station
• MSI — Maritime Safety Information
• NES — Network Encryption System
• SNA — System Network Architecture
• T — Temperature
• SFX — Special Effects
• VQV — Voice Quality Value
• BBM — Blackberry Messenger
• SISIR — Singapore Institute of Standards and Industrial Research
• RADIUS — Remote Authentication Dial-In User Service
• BSS — Base Station Subsystem
• DPSK — Differential Phase Shift Keying
• RPV — Remotely Piloted Vehicle
• CDC — Connected Device Configuration
• BSS — Basic Service Set
• VPA — Valid Peripheral Address
• PS — Product Specification
• LATA — Local Access and Transport Area
• AIF — Audio Interchange Format
• AC — Area Code
• RDI — Remote Defect Indicator (UNI Fault Management)
• L2TPV3 — Layer 2 Tunneling Protocol Version 3
• NTU — Network Termination Unit
• TOVS — TIROS Operational Vertical Sounder

• VOA — Voice Of America
• EIR — Equipment Identity Register
• E — Echo
• DL — Definition List
• HW — Hardware Wars
• LSI — Large Scale Integration -> VLSI
• FITL — Fiber-In-The-Loop
• PMP — Project Management Professional
• SF — Single Frequency
• LAG — Link Aggregation Group
• FMS — Fraud Management System
• IPCP — Internet Protocol Control Protocol
• NWK — Network
• CP — Change Proposal
• BSID — Base Station Identity
• ESP — Encapsulating Security Payload
• MFLOPS — Millions of Floating Point Operations per Second
• SAI — Serving Area Interface
• DNU — Do Not Use
• AS — Access System
• CMOS — Complementary Metal Oxide Semiconductors
• ASYNC — Asynchronous
• CHTML — Compact Hypertext Markup Language
• CGSA — Cellular Geographic Service Area
• AF — Assured Forwarding
• OSF — Open Software Foundation
• BSI — British Standards Institution
• APDU — Application Protocol Data Units
• IPLC — International Private Leased Circuit
• CGI — Cell Global Identity
• CQA — Certified Quality Auditor
• NIU — Network Interface Unit
• CAM — Content Addressable Memory
• LDP — Label Distribution Protocol
• ROW — Rest Of World
• KSU — Key Service Unit
• 4G — Fourth Generation Wireless Systems
• TIFF — Tag Image File Format
• BS — Broadcast Satellite
• DM — Domain Model
• PRI — Priority
• DCA — Dynamic Channel Assignment
• FOSE — Federal Office Systems Exposition
• DUV — Deep Ultraviolet
• FRS — Frame Relay Service
• VHSIC — Very High-Speed Integrated Circuit
• IOC — Inter-Office Channel
• AAS — advanced automation system (FAA)
• ER — Extended Range
• FH — Frequency Hopping

• RECON — Reconnaissance
• TCM — Trellis-Coded Modulation
• DTMF — Dual-Tone MultiFrequency
• RSS — Radio Service Software (Motorola)
• DDL — Digital Data Link
• GMRS — General Mobile Radio Service
• ES — Emergency Service
• C — Collector
• VT — Vacuum Tube
• SPM — Scanning Probe Microscope
• RISC — Reduced Instruction Set Computing
• SCCP — Signalling Connection Control Part
• UP — User Profile
• MDM — Mobile Device Management
• CCLC — Carrier Common Line Charge
• SFN — Single Frequency Network
• DII — Dynamic Invocation Interface
• SCO — Synchronous Connection Oriented
• EU — End User
• OSP — Outside Plant
• EIR — Excess Information Rate
• TLK — Talk
• BMEWS — Ballistic Missile Early Warning System (bee-mews)
• 2G — Second Generation Wireless Systems
• ALT — Accelerated Life Test
• CIP — Continuous Improvement Program
• PC — Peripheral Controller
• GDK — GIMP (GNU Image Manipulation Program) Drawing Kit
• SIMT — Système interbancaire marocain de télécompensation
• DACS — Digital Access Cross-connect System
• DBRNC — deciBel Relative to Noise in a Circuit
• CIRC — Cross-Interleaved Reed-Solomon Code
• TC — Transmission Convergence (ATM)
• DISN — Defense Information Systems Network
• SWBD — Switchboard
• ANC — Access Network Controller
• DFG — difference-frequency generation
• CB — Citizens' Band
• PBT — Polybutylene Terephthalate
• CMIP — Common Management Information Protocol (ATM)
• DHD — Dial Home Device
• FRAD — Frame Relay Access Device
• E — Electra
• EM — Electromigration
• BDE — Borland Database Engine
• LD — Laser Diode
• SS1 — Signalling System 1 (500/20 Hz tones)
• CONUS — Contiguous United States
• HFC — Hybrid Fiber/Coaxial network
• PIC — Programmable Interrupt Controller

• ODS — Operational Data Store (knowledge management)
• IRC — International Record Carrier
• NAS — Network-Attached Storage
• CS — Convergence Sublayer (ATM)
• OBC — Onboard Computer
• FDL — Facility Data Link
• SIM — Subscriber Identity Module
• TD-CDMA — Time Division - Code Division Multiple Access
• NDIS — Network Driver Interface Specification (Microsoft Windows NT)
• MHO — My Humble Opinion
• BS — Backing Store
• SG — Signaling Gateway (IETF)
• SB — Switchboard
• CPC — Continous Packet Compression
• FRS — Family Radio Service
• FDTD — Finite Difference Time Domain
• O/S — Operating System
• JAN — Joint Army-Navy
• IPR — Intellectual Property Right
• W-CDMA — Wideband Code Division Multiple Access
• ESCA — photoelectron spectroscopy for chemical analysis
• RX — Receive
• ACSE — Association Control Service Element
• ANSI-41 — ANSI standard for mobile management
• IRF — Impulse Response Function
• # — Number sign, octothorp; special function key
• IEC — Interexchange Carrier
• SVC — Switched Virtual Circuit (ATM)
• CGA — Carrier Group Alarm
• DMI — Distributed Management Interface
• XPS — X-Ray Photoelectron Spectroscopy
• BSS — Base Station System
• LSW — Least Significant Word
• PCI — Personal Computer Interface
• UART — Universal Asynchronous Receiver/Transmitter
• SMR — Specialized Mobile Radio
• FECN — Forward Explicit Congestion Notification (ATM)
• SZ — Seizure
• VLAN — Virtual Local Area Network
• DOR — Detailed Outage Report
• HTML — Hyper-Text Markup Language
• TDRSS — Tracking and Data Relay Satellite System
• RADINT — Radar Intelligence
• MV — Motion Vector
• 3G — 3rd Generation Wireless Format
• CP — Cell Phone
• IPS — InPlane Switching
• PU — Physical Unit (IBM)
• EA — Extended Address Field Bit
• MSW — Most Significant Word

• SIL — Silence
• STD — Subscriber Trunk Dialing
• SAS — Special Access Surcharge
• CES — Circuit Emulation Service
• PVC — Permanent Virtual Connection
• ST — Such That
• F — Frequency
• CAP — Capability
• MIDP — Mobile Information Device Profile
• CCR — Customer Controlled Reconfiguration (Sprint)
• GTP — GPRS (General Packet Radio Service) Tunneling Protocol
• TOP — technical/office protocol
• DTN — Data Transfer Network
• DDD — Direct Distance Dialing
• DTU — Data Transfer Unit
• SCM — Single-Carrier Modulation
• ADC — Access Deficit Charge
• DLCI — data link connection identifier
• GBT — Ground Based Tower
• FDD — Frequency Division Duplex
• CALEA — Communications Assistance for Law Enforcement Act
• CIS — Computer and Information Science
• NII — National Information Infrastructure (USA)
• ISG — Information Systems Group
• CGA — Color Graphics Adapter
• FSK — Frequency Shift Keying
• 3-D — 3-Dimensional
• RCC — Radio Common Carrier
• WSFL — Web Services Flow Language
• OSS — Operations Support System
• DPCM — differential pulse code modulation
• ACP — Access Control Point
• ADC — Administration Center
• TAD — Telephone Answering Device
• DM — Differential Mode
• LOO — Likelihood of Occurrence
• YA — Yet Another
• BMS — Business Management System
• CGI — Computer Graphics Interface
• ESPN — Entertainment and Sports Programming Network
• IT — Integration Test
• TSO — Telecommunications Service Order
• ZCZ — Zero Correlation Zone
• ARSR — Air Route Surveillance Radar
• ALB — Analog Loopback
• MTD — Moving Target Detection
• WSDL — Web Services Description Language
• L2F — Layer 2 Forwarding protocol
• CCA — Carrier-Controlled Approach
• VESA — Video Electronics Standards Association

• CAM — Computer-Aided Manufacturing
• IWF — Interworking Function
• CNG — comfort noise generation
• RJE — Remote Job Entry
• RDS — Rate Determining Step
• DFE — Design For Environment
• ACF — Advanced Communications Function (IBM)
• SRM — Scalable Reliable Multicast
• BY — Busy
• PSN — Packet Switched Network
• OSCAR — Orbiting Satellite Carrying Amateur Radio
• ACE — Adaptive Communication Environment
• FHSS — Frequency Hopping Spread Spectrum
• TRS — Trunked Radio Systems
• SSM — Synchronization Status Message
• RM-ODP — Reference Model for Open Distributed Processing
• RLS — Recursive Least Squares
• TAM — Telephone Answering Machine
• MAI — Multiple Access Interference
• CLDC — Connected Limited Device Configuration
• IPM — Inches Per Minute
• COO — Cell of Origin
• NTE — Network Terminating Equipment
• ATS — Air Traffic Services
• NTDS — Naval Tactical Data System
• CPC — Calling Party Control
• VTS — Vessel Traffic Service
• WTP — Wireless Transaction Protocol
• WAYP — White and Yellow Pages
• SYSADM — System Administrator
• SPX — Sequenced Packet Exchange
• CRB — Cramer-Rao Bound
• BHCA — Busy Hour Call Attempts
• LP — Line Pair
• FTTC — Fiber To The Curb光纤到路边
• SQ — Service Quality
• NAK — Negative Acknowledge
• SAF — System Access Fee
• TMS — Time Management System
• LAAS — Local Area Augmentation System
• CSC — Common Signaling Channel
• CLK — Clock
• TACACS — Terminal Access Controller Access Control System
• PAM — Payload Assist Module
• LCR — Least Cost Routing
• TRS — Telecommunications Relay Service
• MTS — Message Transfer System
• SDU — Signal Distribution Unit
• TSE — Toronto Stock Exchange
• PUC — Public Utility Commission (electricity)

• DDU — Disk Drive Unit
• BWD — backward
• MLM — Multi-Longitudinal Mode
• TSB — Telecommunication Standardization Bureau
• MEAS — Measure
• DIV — Divisionsion
• CIP — Carrier Identification Parameter
• FGD — Feature Group D
• DAS — Data Acquisition System
• IS 41 — Interim Standard 41 (Inter-Cellular Network Communication Protocol)
• CS — Central Station
• LASA — Large Aperture Seismic Array
• SETI — Search for Extraterrestrial Intelligence
• IG — Interface Group
• DAP — Distributed Array Processor
• M/W — MicroWave
• DMI — Desktop Management Interface (computing)
• SRR — Search and Rescue Region
• PSS — Performance Support System
• LIS — Lightning Imaging Sensor
• ERL — Echo Return Loss
• CMRS — Commercial Mobile Radio Service
• AWT — Agence Wallonne des Télécommunications
• CS-PDU — Convergence Sublayer - Protocol Data Unit
• TOMS — Total Ozone Mapping Spectrometer (satellite Instrument)
• SIA — Securities Industry Association
• BOSS — Binary Object Storage System
• WIS — WAN (Wide Area Network) Interface Sublayer
• UMA — Unlicensed Mobile Access
• DDLD — Direct Dial Long Distance
• EMR — Electromechanical Relay
• DLP — Data Link Processor
• TCP/IP — Transmission Control/Internet Protocol
• MSC — Mobile Switching Center
• ASAR — Advanced Synthetic Aperture Radar 
• EVA — Electronic Video Agent
• AFI — Authority and Format Identifier
• MMC — Microsoft Management Console (Microsoft)
• NA — Network Adapter
• ADPCM — Adaptive Differential Pulse Code Modulation
• SNIX — Single Noise Interference Xterminator
• ETF — Early Termination Fee
• EGSM — Extended Global System for Mobile Communications
• OXCO — Oven-Controlled Crystal Oscillator
• SM — Service Module
• NCC — Network Control Center (GSFC)
• NW — North West
• ABM — Asynchronous Balanced Mode
• P — Priority
• PTO — U.S. Patent And Trademark Office

• SR — Slow Release
• SM OFC — Single-Mode Optical Fiber Cable
• FEA — Finite Element Analysis
• BAN — Building Area Network
• COM — Comedy Central
• FAS — Frame Alignment Signal
• NEMP — Nuclear Electromagnetic Pulse
• NCAR — National Center for Atmospheric Research (US)
• AVR — Automated Voice Response
• SCPC — single channel per carrier
• S/D — Source/Drain
• WDA — Wireless Digital Assistant
• SPIN — Service Provider Identification Number
• 3GPP — Third-Generation Partnership Project
• BUFR — Binary Universal Form for the Representation (of data)
• AP — Action Point
• DARTS — Design Approach for Real-Time Systems
• IPS — Instructions Per Second
• VG — Voice Grade
• SN — Service Number
• DEM — Digital Elevation Model
• CBWFQ — Class Based Weighted Fair Queueing
• STD — Secondary Telecom District
• DA — deca
• HUP — Hook-UP
• SAT — Satellite
• DSI — Digital Speech Interpolation
• NDS — Novell Directory Services
• TDR — Time-Domain Reflectometry
• * — Star, special function key
• SIP — Session Initiation Protocol
• SSMA — Spread-Spectrum Multiple Access
• AMA — automatic message accounting
• OOK — On/Off Keying
• BA — Behaviour Aggregate
• CSU — Channel Service Unit
• CCITT — Comit? Consultatif International T?l?graphique et T?l?phonique
• 2G — Second generation cellular
• RDMA — Remote Direct Memory Access
• NSAP — Network Service Access Point
• MNP — Mobile Number Portability
• CT — Computer Terminal
• V — Variable
• SSM — Spread Spectrum Modulation
• KSPS — KiloSymbols Per Second
• PNP — Plug-and-Play
• CCNA — Cisco Certified Network Administrator
• EBIC — Electron Beam Induced Current
• FGA — Feature Group A
• WDN — Wireless Developer Network

• DTI — Digital Trunk Interface
• SLV — Satellite-Launch Vehicle
• REPT — Report
• EDFA — Erbium-Doped Fiber Amplifier
• BUS — Broadcast and Unknown Server
• LDN — Local Directory Number
• SCCP — Signaling Connection Control Point
• CPG — Converged Packet Gateway
• DOCSIS — Data over Cable Service Interface Specification
• CAM — Common Access Method
• ADCCP — Advanced Data Communication Control Procedures
• SLIC — Subscriber Line Interface Circuit
• B8ZS — Binary Eight Zero Substitution
• LFTYR — Ley Federal de Telecomunicaciones y Radiodifusión
• DAC — Digital-To-Analog Converter
• DCF — Distributed Coordination Function
• BCS — British Computer Society
• 4WA — Four Wire Analog
• AAL5 — ATM (Asynchronous Transmission Mode) Adaptation Layer 5
• CP — Call Processing
• PARC — Palo Alto Research Center
• CND — Calling Number Display
• PSNEXT — Power Sum Near End Cross Talk
• ILEC — Incumbent Local Exchange Carrier
• STM — Synchronous Transfer Mode
• COT — Central Office Terminal
• EDSX — Electronic Digital Signal Cross-Connect
• 3GSM — Third-generation Global System for Mobile (communications)
• INE — Intelligent Network Element
• CE — Channel Element
• CTI — Computer Telephony Integration
• RDBMS — Relational Data Base Management System (Oracle)
• LUNT — Line Unit Network Termination
• SD — Speed Dial
• DNC — Do Not Call
• UAT — Universal Access Transceiver
• RSL — Restricted Service License
• RXQUAL — Received Signal Quality
• BORSCHT — Battery feed, Overvoltage protection, Ringing, Signaling, Coding, Hybrid, and Testing
• DGPT — Directorate General of Posts and Telecommunications
• SSRC — Synchronization Source
• ALI — Automatic Location Information
• BDSL — Broadband Digital Subscriber Line
• PTM — Packet Transport Mode
• 3G — Third Generation (mobile communication system)
• LIM — Line Isolation Monitor
• XC — Cross-Connect
• IMP — Interface Message Processor
• DICOM — Digital Imaging and Communications in Medicine
• VPX — Virtual Path Cross-Connect

• VCI — Virtual Channel Identifier
• TUR — Trunk Utilization Report
• PWM — Pulse width modulation
• PTP — Point To point Protocol
• DLU — Digital Line Unit
• TAX — Trunk Automatic Exchange
• OODBMS — Object-Oriented Database Management Systems
• TM — Thematic Mapper (Landsat)
• CEPT — Conférence Européenne des Administrations des Postes et des Télécommunications
• ARM — Asynchronous Response Mode
• HSPA — High Speed Packet Access
• SN — Stock Number
• ELFEXT — Equal-Level Far-End Cross-Talk
• WNMS — Wireless Network Management System
• MC/MIC — Mode Common/Mode Indicate Common
• ARCNET — Attached Resource Computer Network
• UMTS — Universal Mobile Telecommunication System
• AAV — Alternate Access Vendor
• RIPE NCC — Reseaux IP Europeens Network Coordination Centre
• RNX — Restricted Numeric eXchange
• ECM — Error Correction Model
• CSIRO — Commonwealth Scientific and Industrial Research Organization
• FCFS — First-Come, First-Served
• INMS — Integrated Network Management System
• 3G HSPA — Third-Generation High-Speed Packet Access
• LOP-P — Loss Of Pointer - Path
• CDDI — Copper Distributed Data Interface
• LANE — Local Area Network Emulation
• F/W — Firmware
• HFC — Hybrid Fiber Coaxial
• MITI — Ministry of International Trade and Industry
• STU — Secure Telephone Unit
• BATM — Basic Telecommunication Access Method
• CFR-47 — Code of Federal Regulations Title 47 (FCC)
• DL — Downlink Message
• LIF — Logical Interchange Format
• ETOC — Electronic Table of Contents
• TSP — Telecommunications Service Priority
• A/C — Air Conditioner
• LRQ — Location Request
• EECM — End-to-End Call Manager
• CPE — Customer Premise Equipment
• FIRST — Forum of Incident Response and Security Teams (CERT)
• 3GIP — Third Generation Internet Protocol
• ASN.1 — Abstract Syntax Notation 1
• TDWR — Terminal Doppler Weather Radar
• NCP — Network Control Program
• SCCS — Switching Control Center System
• ASD — Alternative Service Delivery
• DLL — Digital Local Line

• WSA — Wireless Security Auditor
• OML — Object Model Library
• PSO — Professional Services Organization
• BAP — Bandwidth Allocation Protocol
• AECT — Association for Educational Communications and Technology's
• RTC — Real-Time Control
• FOIP — Fax Over Internet Protocol
• FEBE — Far End Block Error (SONET)
• MBE — Molecular Beam Epitaxy
• RAU — Remote Access Unit
• FCA — Free Carrier Alongside
• DMT — Discrete Multi-Tone Technology
• S/N — Signal-to-Noise ratio
• BSA — Basic Service Area
• CIP — Channel Interface Processor
• FOD — Fax on Demand
• LN — Line
• RICK — Repeater Interface Communications Kit
• SE — Southeast
• VSAM — Virtual Storage Access Method
• ESN — Electronic Serial Number
• DXC — Digital Cross Connect
• SA — Selective Availability (on GPS transmissions)
• CSAR — Combat Search and Rescue
• COMB — Combined
• DLT — Delete
• DXF — Data Exchange Format
• MMM — Mobile Media Mode
• EPP — Enhanced Parallel Port (PC)
• ARPT — Autorité de Régulation des Postes et Télécommunications
• PMT — Program Management Team
• WSP — Wireless Service Provider
• CAAS — Communications-as-a-Service
• ATSC — Advanced Television Systems Committee
• FIOS — Fiber Optic Services
• MLA — Modern Language Association
• UBR — Unspecified Bit Rate
• GTB — Global Telecom Brokers
• FXS — Foreign Exchange Subscriber
• RS — Receive Signature
• JISC — Japanese Industrial Standards Committee
• NT — New Technology, also Windows NT
• BIND — Berkeley Internet Name Domain
• N-AMPS — Narrowband Advanced Mobile Phone System
• MTA — Message Transfer Agents (Internet)
• FNN — Full National Number
• MSDP — Multicast Source Discovery Protocol
• SCU — System Control Unit
• PLL — Phase Locked Loop
• CIC — Carrier Identification Code

• FLL — Fixed-Loss Loop
• UTL — Utility
• DDI — Direct Dialing Incoming
• MAG — Mobile Access Gateway
• BCSM — Basic Call State Model
• SIM — Subscriber Identification Module
• DPT — Dynamic Packet Transport
• GERAN — GSM (Global System for Mobile communications) Edge Radio Access Network
• LBR — Low Bit Rate
• CDA — Communications Decency Act's
• CAR — committed access rate
• VLSI — Very Large-Scale Integration
• PDL — Positioning Data Link
• LH — Link Handler
• MH — Message Handler
• NAU — Network Addressable Unit
• STM — Scanning Tunneling Microscopy
• PMOS — P-channel Metal Oxide Semiconductor
• WARC — World Administrative Radio Conference
• TP-PMD — Twisted Pair Physical Medium Dependent
• PNP — Positive-Negative-Positive
• MGC — Multimedia Gateway Controller
• DNSIX — Defense Network Security Information Exchange
• CLCC — Ceramic Leaded Chip Carrier
• CASE — Computer-Aided Software Engineering
• MA — Maintenance Action
• CTIA — Cellular Telecommunications Industry Association
• SPID — Service Profile Identifier
• DC — Device Control
• NAP — Network Access Point
• 100VG — 100 Voice Grade (IEEE 802.12 AnyLAN Standard)
• ATU-C — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Central office end
• VPWS — Virtual Private Wire Service
• WE — Western Electric
• LASINT — Laser Intelligence
• ECDIS — Electronic Chart Display Information System
• DCAS — Downloadable Conditional Access System
• SSAP — Source Service Access Point
• CV — Coding Violation
• ETN — Electronic Tandem Network
• SCR — Sustainable Cell Rate
• PTT — Push to Talk Taster
• ENV — Environment
• PTT — Push to Talk Technology
• RMON — Remote Monitoring
• FAC — Forced Authorization Code
• EMF — Event Management Framework
• PTT — Push to Talk Testing
• WTS — Wireless Telecommunications Symposium
• CPH — Call Party Handling

• CRV — Call Reference Value
• EDC — Electronic Dispersion Compensator
• AARQ — A-Associate Request
• TOC — Telecommunication Operations Center
• B-CPE — Broadband Customer Premises Equipment
• MAU — Multistation Access Unit
• AQP — Association for Quality and Participation
• WIVO — WIreless VelOcity
• NTSC — National Television Standards Committee
• L2TP — Layer 2 Tunneling Protocol
• VC — Virtual Circuit (ATM)
• STMR — Sidetone Masking Rating (telecommunications)
• URN — Uniform Resource Namespace
• EM — Element Manager
• PTI — Payload Type Indicator
• SPE — Synchronous Payload Envelope
• TACSAT — Tactical Satellite
• CAMEL — Customized Applications for Mobile-network Enhanced Logic
• NF — Noise Factor
• ILETS — International Law Enforcement Telecommunications Seminar
• AWG — arrayed waveguide grating
• ECS — Environmental Control System (Subsystem)
• DTE — Digital Terminal Equipment
• MC — Maintenance Control
• VN — Virtual Network
• SEM — Scanning Electron Microscopes
• DNI — Data Network Interface
• INTELSAT — International Telecommunications Satellite
• MTI — Moving Target Indicator
• WFA — Wait for Answer
• ALOC — Average Length Of Call
• IDCP — Internet Device Control Protocol
• ATCA — Advanced Telecom Computing Architecture
• FDI — Feeder Distribution Interface
• ET — Electronic Transmission
• AIS-L — Alarm Indication Signal - Line
• FB — Fine Business
• ANS — Advanced Network Services
• TDM — Time Division Multiplexing
• GI — Graded-Index
• CACH — Call Appearance Call Handling
• FTTK — Fibre To The Kerb
• BB — Blackberry
• BPP — Billed Party Preference
• NRP — Network Resource Planning
• AOS — Alternate Operator Service
• MF — Multiple Frequency
• CPOP — Circuit Precedence Over Packet data
• GAN — Global Area Network
• CDV — Cell Delay Variation(ATM)

• SCR — System Change Request
• BIOS — Basic Input-Output System
• VAN — Value-Added Network
• CDM — Conceptual Data Model
• EST — Electroshock Therapy
• FTS — Federal Telecommunications System
• FCA — Fixed Channel Allocation
• RADIUS — Remote Authentication dial In User Service
• TEI — Terminal Endpoint Identifier
• TLT — Test Loop Translator
• NSE — Network Software Environment
• MPI — Minimum Picture Interval
• KEK — Key Encrypting Key
• ETSI — European Telecommunications Standards Institute
• BSC — Bi-Synchronous Communications
• DQDB — Distributed Queue Dual Bus
• P2P — Person-to-Person
• NLM — NetWare Loadable Module
• LMT — Lightwave Microcell Transceiver
• DXI — Data Exchange Interface
• DPNSS — Digital Private Network Signaling System
• WRT/R — Wireless Transmitter/Receiver
• FIFO — first-in, first-out
• MFC — Multi-Frequency Code
• DUV — Data-Under-Voice
• CALS — Computer Aided Acquisition and Logistic Support
• ARD — Automatic Ring Down
• TRX — Tandem Repeater eXchange
• BOM — Bit-Oriented Message
• PSN — Public Switched Network
• FRF-LMI — Frame Relay Forum - Local Management Interface
• MAP — Mobile Application Part
• ACA — Adaptive Channel Allocation
• ETOM — Enhanced Telecom Operations Map
• ADPC — Automatic Data Processing Center
• DMS — Defense Messaging System
• ARFA — Allied Radio Frequency Agency
• LEED — Low-energy Electron Diffraction
• LORAN — Long Range Aid to Navigation System
• CTE — Computer Telephony Engineer
• CCCH — Common Control Channel
• ISI — Intersymbol Interference
• GRX — GPRS Roaming Exchange
• MDN — Mobile Directory Number
• RADARSAT — Radar Satellite
• TBCD — Telephony Binary Coded Decimal
• A/D — Analog-to-Digital converter
• PIM — Protocol Independent Multicast
• USRT — Universal Synchronous Receiver/Transmitter
• FTTP — Fiber To The Premises

• ATTRA — Appropriate Technology Transfer for Rural Areas
• SSN — Switched Service Network
• LDI — Long Distance Interconnect
• CERN — Conseil Europeen Pour La Recherche Nucleaire
• DTAP — Direct Transfer Application Process
• RSN — Regional Service Network
• ULL — Unbundled Local Loop
• RWIN — Receive Window
• FAT — Final Acceptance Testing
• FGDC — Federal Geographic Data Committee's
• EC — Equipment Controller
• TON — IEEE/ACM Transactions On Networking
• BABT — British Approvals Board for Telecommunications
• LMDS — Local Multipoint Distribution Service
• SDNS — Secure Data Network System
• LCGN — Logical Channel Group Number
• DE — Discard Eligibility (ATM)
• VTAM — Virtual Telecommunication Access Method
• BT — Bluetooth Tablet
• GTM — Go to Meeting
• ICL — Inserted Connection Loss
• BASIZE — Buffer Allocation Size
• WTNM — Working Telephone Number Management
• TBPS — Terabits Per Second
• WRED — Weighted Random Early Detection
• CMA — Communications Management Association
• MIS — Marketing Intelligence System
• ATS — Abstract Test Suite
• CAPTAIN — Character And Pattern Telephone Access Information Network
• CBQ — Class-Based Queuing
• NCF — Network Control Facility
• AAP — Alternate Access Provider
• LAPB — Link Access Protocol-Balanced
• MMDS — Multichannel Multipoint Distribution Service
• RCP — Right-Hand Circular Polarization
• LOB — Line Of Bearing/Balance
• CRS — Cell Relay Service
• MILNET — Military Network
• RAD — Recorded Announcement Device
• PSLV — Polar Satellite Launch Vehicle (Indian Space Research Organization; India)
• DS-3 — Digital Signal, Level 3
• TD — Transmit Data
• IPRC — Intellectual Property Rights Committee
• ATRAC — Adaptive Transform Acoustic Coding
• MA — Message Analysis
• BIS — Brought Into Service
• QOI — Quality of Information
• DPA — Distributed-Power Architecture
• ILD — International Long Distance
• CRBT — Color Ring Back Tone

• FFH — Fast Frequency Hopping
• VISSR — visible and infrared spin scan radiometer (GOES)
• MP — Modulation Parameter
• EV — electronvolt
• GRUB — Greedy Reclamation of Unused Bandwidth
• HDTV — High-Definition Television
• DPDT — Double-Pole Double-Throw
• CRTS — Cellular Radio Telecommunications Service
• NMC — Network Management Center
• RDSS — Radio Determination Satellite Service
• 4WAI — Four-Wire Analog Interface
• OSA — Open System Architecture
• SRL — Singing Return Loss
• VSAT — Very Small-Aperture Terminal
• DCMES — Dublin Core Metadata Element Set
• PY — person-year
• CON — Concentrator
• VSM — Vestigial Sideband Modulation
• BT — Burst Tolerance
• ESCON — Enterprise System Connection
• RDT — Remote Digital Terminal
• SRA — Seamless Rate Adaptation
• DSSSL — Document Style Semantics and Specification Language
• SDSL — Symmetrical Digital Subscriber Line
• ADM — Administration Building
• FAW — Frame Alignment Word
• IR — International Roaming
• VOFR — Voice Over Frame Relay
• DOD — Direct Outward Dialing
• CSR — Customer Service Request
• UTRAN — UMTS (Universal Mobile Telecommunication System) Terrestrial Radio Access Network
• FOC — Fiber-Optic Cable
• TSG — Telephone Security Group
• VADB — Virtual Auto Dial Backup
• AB — Answer Back
• TRIG — Trigger
• EF&I — Engineering, Furnishing and Installation
• ADM — Administration, Office of
• DRQ — Disengage Request
• DTU — Date/Time Update
• EC-N — Electrical Carrier (n=a number, e.g., EC-4)
• UAN — Universal Area Network
• ECTF — Enterprise Computer Telephony Forum
• MOS — Metal Oxide Semiconductor (FET Devices)
• X — X Window System
• DPBX — Digital Private Branch Exchange
• UNO — Universal Network Operations
• ATB — Above-Ground Telecommunications Backbone
• FDOA — Frequency Difference Of Arrival
• WVOIP — Wireless Voice over Internet Protocol

• UPT — Universal Personal Telecommunications
• DTL — Defense Telephone Link
• RADSL — Rate Adaptive Digital Subscriber Line
• ATD — Advanced Technology Demonstration
• BHA — Busy Hour Attempts
• BTN — Billing Telephone Number
• IBS — In-Building Solutions
• SN — Switching Network
• LCF — Location Confirm
• MR — Mobile Router
• IBSS — Independent Basic Service Set
• MPU — Main Processor Unit
• BIC — Bus Interface Controller
• PACS — Personal Access Communications System
• LS — Loop Start
• LSAP — Link Service Access Point
• DCS — Defense Communications System
• SCH — Synchronization Channel
• RTB — Retransmission Buffer
• QSTN — Question
• AGCH — Access Grant Channel
• FC — Frame Control
• QOTS — Quality Of Telephone Services
• AIU — Analog Interface Unit
• ACU — Automatic Calling Unit
• RFR — Radio Frequency Radiation
• EVC — Electronic Voucher Charging
• WFT — Wireline Formation Test
• PTE — Path Terminating Equipment (SONET)
• WIN — Wireless Intelligent Network
• DAC — Digital to Analog Converter-Audio
• FEAT — Feature
• COP — Character Oriented Protocol
• TSI — time-slot interchange
• SMSC — Short Message Service Center
• GFC — Generic Flow Control (ATM)
• ANAC — An Automatic Number Announcement Circuit
• SMMR — Scanning Multichannel Microwave Radiometer
• CAS — Column Address Strobe
• 802.11 HR — High data Rate IEEE 802.11 Wireless LAN protocol
• DMT — Discrete Multi-Tone
• LLA — Link Level Access
• RS-422 — Recommended Standard 422 (ANSI/EIA standard for transmitting serial data)
• PD — Pulse Duration
• BAF — Bellcore AMA (Automatic Message Accounting) Format
• FI — Format Identifier
• CFOT — Certified Fiber-Optic Technician
• KTS — Key Telephone System
• DPST — Double-Pole Single-Throw
• CDV — Compressed Digital Video

• AAL — ATM (Asynchronous Transmission Mode) Adaptive Layer
• RPCU — Radio Port Control Unit
• DUN — Dial-Up Networking
• OLS — Optical Line System
• 4G — Fourth Generation
• SMS — Service Management System
• DS-1 — Digital Signal, Level 1
• RCU — Radio Control Unit
• OMP — Open Management Platform
• CCSA — Common Control Switching Arrangement
• RDT — Recall Dial Tone
• CLD — Cross-Layer Design
• BNCC — Base Network Control Center
• ADF — Application Dedicated File
• COC — Central Office Connection
• COFA — Change Of Frame Alignment
• HEC — Header Error Control
• INSAT — Indian National Satellite
• NAM — Number Assignment Module
• NRZ — Nonreturn To Zero
• SBX — Small Business Exchange
• ZD — Zero Defects
• TC — Technical Committee (HL7)
• JWP — Joint Working Party
• GMSS — Global Mobile Satellite System
• AAV — Alternative Access Vendor
• WFG — Wireless Firewall Gateway
• CCR — Current Cell Rate (ATMF)
• LB — Local Battery
• ET — Exchange Terminal
• TCB — Telecommunication Certification Body
• EFCI — Explicit Forward Congestion Indication (ATM)
• AA — Auto-Answer
• DMNG — Digital Mobile News Gathering
• UDP — Up Down Pair
• SMU — Service Management Unit
• DECCO — DISA Defense Commercial Communications Office
• CATI — Computer-Assisted Telephone Interviewing
• TEL & TEL — TELephone and TELegraph
• CDA — Communications Decency Act of 1996
• TU — Transmission Unit
• PLCP — Physical Layer Convergence Procedure
• RNR — Receive Not Ready
• FMR — Follow Me Roaming
• SGSN — Serving GPRS (General Packet Radio Service) Support Node
• BSC — Base Station Controller
• ALCAP — Access Link Control Application Protocol
• PGP — Pretty Good Protection (encryption)
• ACM — Address Complete Message
• CID — Craft Interface Device

• BONDING — Bandwidth On Demand Interoperability Group
• STA — Science and Technology Agency (Japan)
• TCS — Telephony Control Specification
• PTCL — Pakistan Telecommunication Company Ltd
• IMPI — IP (Internet Protocol) Multimedia Private Identity
• NC — Network Computer (PC Internet)
• CTO — Commonwealth Telecommunications Organisation
• TP — Telephone Pole
• BPSK — Binary Phase-shift Keying
• CFS — Call for Service
• E — Exchange
• LCP — Local Control Point
• FPS — Framing Pattern Sequence
• EEROM — Electronically Erasable Read-Only Memory
• UMTS — Universal Mobile Telecommunications Service
• PSK — Phase Shift Key
• ALI — Automatic Location Identifier
• UNI — User-Network Interface
• VNL — Via Net Loss
• OTF — On-The-Fly (data acquisition method)
• WDSL — Wireless Digital Subscriber Line
• MNOS — Metal-nitride-oxide Semiconductor
• ANSI — Advanced Network Signaling Input
• CLI — Calling Line Identification
• HUACA — Hang Up And Call Again
• TT — Text-Telephone
• DDU — Digital Data Unit
• SCORM — Shareable Content Object Reference Model
• XRF — X-Ray Fluorescence
• ACF — Access Coordination Function
• BHCC — Busy Hour Call Completions
• RLC — Radio Link Control
• RRC — Root Raised-Cosine
• ESM — electronic support measure
• IXC — interexchange carrier
• BTP — Business Telecom Products, Inc.
• CSCW — Computer-Supported Cooperative Work
• NC — Network Channel
• IMTS — Improved Mobile Telephone Service
• VO — Voice Only
• CPAP — Customer Premises Access Profile
• TP — Transition Point
• CSDU — Core Service Data Unit
• BRAN — Broadband Radio Access Network
• UCF — Unregistration Confirm
• LCAS — Link Capacity Adjustment Scheme
• SAA — Systems Application Architecture
• BOA — Basic Object Adapter
• CCP — Compression Control Protocol
• TJB — Telephone Junction Box

• AFCEA — Armed Forces Communications and Electronics Association's
• AIS-P — Alarm Indication Signal - Path
• CSR — Customer Service Report
• BUS — Business Units
• FESS — Flywheel Energy Storage System
• WVPN — Wireless Virtual Private Network
• PFE — Power Feed Equipment
• ADM 3X — DS3 Add-Drop Multiplex
• BTS — Base Transceiver Station (cellular)
• PMMA — Polymethyl Methacrylate
• AMTFT — Active Matrix Thin Film Transistor
• BAOC — Barring of All Outgoing Calls supplementary service
• SSU — Synchronization Supply Unit
• PMT — Photo Multiplier Tube
• ATL — Advanced Technology Laboratory
• SLIC — Subscriber Loop Interface Circuit
• TCA — Threshold Crossing Alert
• MB — Measured Business
• PCS — Personal Communications Services
• AAL2 — ATM (Asynchronous Transmission Mode) Adaptation Layer 2
• FLN — Fixed Line Network
• TMTC — Telemetry and Telecommand
• CDVT — Cell Delay Variation Tolerance
• DAS — Distributed Antenna System
• DECT — Digital Enhanced Cordless Telecommunication
• APPC — Advanced Program-to Program Communications
• NETBIOS — Network Basic Input-Output System
• IVP — Integrated Voice Protocol
• OMF — Object Management Framework
• ANT — ADSL Network Terminator
• BT — Back Trace
• EC — Entropy Coding
• DMT — Discrete Multi-tone Transmission
• BSRF — Basic System Reference Frequency
• CBMS — Computer-Based Message System
• BAM — Basic Access Module
• MBMS — Multimedia Broadcast/Multicast Service
• QS — Quasi-Synchronous
• RJ-11 — Registered Jack type 11 (4-wire connector)
• UNI — User Network Interface
• O — objective
• ACNA — Access Customer Name Abbreviation
• M — Memory
• MRCA — Most Recent Common Ancestor
• LTU — Line Terminating Unit
• DIL — Direct Inward Line
• LCU — Lightweight Computer Unit
• CNID — Calling Number Identification Display
• PROV — Provisioning
• DMT — Digital-Discrete Multi-Tone

• ACRE — Authorization and Call Routing Equipment
• GSTN — General Switched Telephone Network
• DSU — Digital Service Unit
• CSTA — Computer Supported Telecommunications Applications
• SMT — station management (protocol)
• IPXCP — Internetwork Packet Exchange Control Protocol
• USA — Underground Service Alert
• LIDB — Line Information DataBase
• LSP — Label Switched Path
• NFR — Near-Field Recording
• MVDS — Microwave Video Distribution System
• GSM-R — Global System for Mobile (communications) – Rail
• CCCI — Command, Control, Communications and Intelligence
• SGCP — Simple Gateway Control Protocol
• AEA — American Electronics Association's
• DF — Direction Finding or Finder
• EC — Enhanced Cellular
• VDR — Voice Digitization Rate
• LRM — Long Reach Multimode
• WSP — Wireless Session Protocol
• VOB — Voice Over Broadband
• TSC — Test System Controller
• PSDN — Public Switched Digital Network
• WAAS — Wide Area Augmentation System
• 2G — Second-generation mobile telephone system
• CMTS — Cellular Mobile Telephone System
• GSM — Global System for Mobile telecommunications
• AIS-V — Alarm Indication Signal - Virtual
• CLF — Carrier Line Failure
• NSN — National Significant Number
• NIMH — Nickel-Metal Hydride
• DCO — Dial Central Office
• DS0 — Digital Signal Zero
• CACM — Communications of the ACM
• LSC — Link State Control
• TIMS — Telephone Information Management System
• SR — Service Request
• NICT — National Institute of Information and Communications Technology
• CCSS6 — Common Channel Signaling System # 6
• TCM — Time Compression Multiplexer
• LSI — Large-Scale Integration
• TX — Transmit
• COBE — Corporate Owned Business Only
• TESMA — Telecommunications Equipment and Services Master Agreement
• USF — Universal Service Fund
• NESC — National Electrical Safety Code
• USPI — Universal Serial Phone Interface
• ATIS — Automatic Transmitter Identification System
• GOSIP — Government Open Systems Interconnection Profile
• JSC — Joint Scientific Committee (ICSU, WCRP, and WMO)

• WPC — Wireless Personal Communications
• APS — Advanced Power System
• RCMAC — Recent Change Memory Administration Center
• FR — Functional Requirement
• Z — Zulu Time
• DPT — Dial Pulse Terminate
• MQFP — Metric Quad Flat Pack
• LPDP — Local Policy Decision Point
• ACL — Asynchronous Connection-less Link
• ADTM — Asynchronous Data Transfer Mode
• IMT-2000 — International Mobile Telecommunications 2000
• ADIF — Accounting Data Interchange Format
• LI — Length Indicator
• MGCP — Multimedia Gateway Control Protocol
• SAR — Segmentation and Reassembly (ATM)
• AEIMP — Apple Event Interprocess Messaging Protocol
• RSL — Remote Serial Link
• CC — Composite Clock (SONET)
• MO — Magneto-optic
• OST — Office of Science and Technology
• ATU-R — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Remote terminal end
• BCST — Broadcast
• DDM — Data Distribution Manager
• PHY — Physical Layer
• CWTS — China Wireless Telecommunication Standard
• DNA — Digital Network Architecture
• CALA — Customer Address Location Area
• CLP — Cell Loss Priority (ATM)
• QPM — QoS (Quality of Service) Policy Manager
• STD — Standard Deviation
• BP — Block Parity
• PSQM — Perceptual Speech Quality Measure
• PJC — Pointer Justification Count
• RLA — Received Level Average
• NHRP — Next Hop Resolution Protocol (ATM)
• IDLC — Integrated Digital Loop Carrier
• FMS — Fixed Mobile Substitution
• MITS — Metaphors for Integrated Telecommunications Services
• AVT — Audio Visual Telecommunications
• CAE — Common Application Environment
• B-ISDN — Broadband ISDN
• SAPI — Service Access Point Identifier
• PLE — Path Length Efficiency
• DTR — Down-Time Ratio
• MCR — Minimum Cell Rate (ATM)
• BWX — Broadband Wireless Exchange
• EC — Echo Cancelling
• TRANSEC — Transmission Security
• SQL — Specified Quality Level
• TCL — Transverse Conversion Loss

• ASAS — All-Source Analysis System
• DLE — Digital Local Exchange
• ISSI — Inter-Switching System Interface
• AMOLED — Active Matrix Organic Light-Emitting Diode
• VFL — Visual Fault Locator
• VR — Virtual Router
• LCU — Line Control Unit
• VOB — Versioned Object Base
• LAT — Local Area Transport (network)
• DCC — Digital Control Channel
• BCIX — Berlin Commercial Internet Exchange
• PLCP — Physical Layer Convergence Protocol (ATM)
• VLF — Vertical-Laminar-Flow
• GOMP — Get Off My Phone
• MEH — Mobile-Executed Handoff
• CLOS — Clear Line Of Sight
• SDN — Software Defined Network
• BDFB — Battery Distribution Feeder Bay
• AAS — Automatic Announcement Subsystem
• LULT — Line Unit/Line Termination
• GS — Ground Start
• NANP — North American Numbering Plan
• WAE — Wireless Application Environment
• AFPS — Automatic Facility Protection Switching
• RTFM — Read The Friendly Manual
• VAD — Voice Activity Detection
• BFS — Broadcast File System
• EGPRS — Enhanced General Packet Radio Service
• ITU-T — International Telecommunication Union - Telecommunications section
• IVN — Interactive Video Network
• CAN — Controller Area Network
• RYP — Russian Yellow Pages
• RTC — Right to Carry
• VSC — Vertical Service Code
• DOV — Data-Over-Voice
• PDSO — Packet Data Security Overlay
• SSP — Security Service Provider
• SMS — System Management Server
• CEE — Communaut? Economique Europ?enne
• HU — Hook Up
• IDCU — Integrated Digital Carrier Unit
• TCAM — Telecommunications Access Method
• MAPDU — Management Application Protocol Data Unit
• OSD — Onscreen Display
• WNAN — Wireless Neighborhood Area Network
• PT — Payload Type (ATM)
• VCT — Variable Cam Timing
• CM — Common Mode
• UIT — Union Internationale des Télécommunications
• PCCA — Portable Computer Communications Association

• CD ROM — Compact Disc Read-Only Memory
• MNA — Multi-Network Area
• CCH — Common Channel Handler
• DDSN — Digital Derived Services Network
• CU — Cooling Unit
• MERIS — medium-resolution imaging spectrometer
• LMS — Location and Monitoring Service
• DLT — Digital Line Termination
• EADAS — Engineering and Administrative Data Acquisition System
• RP — Radio Port
• AI — Adapter Interface
• CDPD — Cellular Digital Packet Data
• DSCS — Defense Satellite Communication System
• GOSIP — Government Open System Interconnection Profile
• TOMS — Telecom Operations Management System
• MIR — Maximum Information Rate
• FUD — Fair Use Doctrine
• NEF — Network Element Function
• WIM — WAP (Wireless Application Protocol) Identity Module
• WFA — Work Force Administration
• REN — Ringer Equivalence Number
• HCV — High Capacity Voice
• CT — Cordless Telecommunications
• ECC — Emergency Communications Center
• ULP — Upper Layer Protocol
• SOR — Statement of Requirements
• AT — Attenuation
• TP — Termination Point
• MOC — Maintenance and Operations Console
• PVN — Private Virtual Network
• ECS — Encryption Control Signal
• LZ — Lempel-Ziv compression algorithm
• ATIS — Alliance for Telecommunications Industry Solutions
• ESG — Enhanced Service Gateway
• DORA — EV-DO (EVolution-Data Optimized) standard Revision A
• NSDI — National Spatial Data Infrastructure
• CMT — Commercial Metering Transponder
• HPN — Home Phone Network
• FPLMTS — Future Public Land Mobile Telecommunications System
• WEDE — Wireless Enterprise Delivery Environment
• CAL — Customer Access Line
• CD-ROM — Compact Disk-Read-Only Memory
• MBS — Maximum Burst Size (ATM)
• NMC — Nortel Matra Cellular
• ADTS — Ameritech Digital Transport Service
• VDSL — VHBR (Very High Bit Rate) Digital Subscriber Line
• MODEM — modulation and demodulation
• SDCCH — Standalone Dedicated Control Channel
• TTC — Telemetry Telecommand and Control
• DME — Distributed Management Environment (OSF)

• EKTS — Electronic Key Telephone Set
• DOD — Dial on Demand
• LRF — Laser Range Finder
• DEO — Digital End Office
• DBN — Dial-Back Number
• SPI — Security Parameters Index
• SAMI — Structured Adjustment & Maintenance Interface
• CRL — Computing Research Laboratory
• FEAC — Far End Alarm and Control
• ACMA — Atlantic Cable Maintenance Agreement
• ETB — Empresa de Telecomunicaciones de Bogotá
• GLT — Great Lakes Telecom
• SCC — Specialized Common Carrier
• DACS — Digital Access Carrier System
• TACSIM — Tactical Simulation (Simulator)
• DFT — Draft
• VNS — Virtual Network System
• WLAP — Wireless LAN (Local Area Network) Access Point
• WNAP — Wireless Network Access Point
• IPCDN — IP over Cable Data Networks
• DTW — Dynamic Time Warping
• APPN — Advanced Peer-to-Peer Network
• ABR — Available Bandwidth Rate
• VCR — Videocassette Recorder
• IOC — Interoffice Channel
• TCC — Transmission Control Code
• MDRAM — Multibank Dram
• GEO — Geostationary Earth Orbit
• RCT — remote Control Terminal
• SINS — Ship’s Inertial Navigation System
• RCF — Remote Call Forwarding
• VTIR — visible and thermal infrared radiometer
• CIS — Center for Integrated Systems
• SHD — Smart Handheld Device
• AL — Alignment
• NCOS — Network Class Of Service
• 800 — Freephone
• EA — expedited acknowledgement
• AH — Authentication Header
• DBF — Digital Beam-Forming
• TNI — Telephone Network Interface
• UDT — Unreliable Data Transfer
• NPSI — Network Packet Switching Interface
• TPS — Telephone Preference Service
• LTU — Line Termination Unit
• AMTI — Airborne Moving Target Indicator
• COMPANDER — COMpressor/exPANDER
• GOS — Gerry Otis Simpson
• P&A — Privacy and Authentication
• TSDU — Transport Service Data Unit

• WPBX — Wireless Private Branch Exchange
• TOU — Time of use (rate) (electricity)
• BSS — Broadband Switching System
• 3RNGR — Three Ringer
• OIM — Operations Interface Module
• PCIA — Personal Communications Industry Association
• TAPI — Telephony Application Programming Interface
• WDP — Wireless Datagram Protocol
• WGX — Wireless Gateway Switch
• YIP — Your Internet Phone
• OID — Object Interaction Diagram
• RLC — Reverse Link Channel
• EMV — EuroPay, MasterCard, Visa
• FD — Full Duplex
• AADS — Ameritech Advanced Data Services
• IDEN — Integrated Dispatch Enhanced Network
• DE — Discard Eligible
• LQD — Line Quality Disturbance
• LXT — Local Exchange Terminal
• CDSL — Consumer Digital Subscriber Line
• TNMS — Telecommunications Network Management System
• CCS — Call Center Service
• TRCSL — Telecommunications Regulatory Commission of Sri Lanka
• PVG — Packet Voice Gateway
• ATB — All Trunks Busy
• SOH — Section Overhead
• DNA — Do Not Answer
• VPC — Virtual Path Connection (ATM)
• TLP — Transmission Level Point
• PRM — Performance Report Message
• ESA — Enhanced Subscriber Authentication
• SACS — Security Access Control System
• CPN — Customer Premise Network
• AWA — Advanced Wireless Access
• MIN — Mobile Identification Number
• CYTA — Cyprus Telecommunications Authority
• CDM — Configuration Data Manager
• GVPN — Global Virtual Private Network
• CD — Committee Draft
• ILF — Initial License Fee
• SR — Scanning Radiometer
• DORK — Disciples Of The Righteous King
• CELP — Code Excited Linear Prediction
• LRB — Loop Reverse Battery
• PNM — Pulse Number Modulation
• ADAD — Automatic Dialing Announcing Device
• SHR — Self-Healing Ring
• DCEF — Distributed Cisco Express Forwarding
• IRAC — Internal Review and Audit Compliance
• IRLAP — InfraRed Link Access Protocol

• 4WE&M — Four-Wire Ear and Mouth
• CLASS — Cell Level ATM (Asynchronous Transfer Mode) Services Simulator
• V — Vector
• CEPT — Conference of European Posts and Telecommunications
• CCS — Common Command Set
• VCC — Voice Call Continuity
• QPA — Quality Performance Analysis
• PTT — Post Telegraph and Telecommunications
• JMA — Japanese Meteorological Agency
• CM — Connection Manager
• WDMW — Web Directory for Mobile and Wireless
• CALC — Customer Access Line Charge
• NICAD — Nickel Cadmium
• C² — Command and Control
• CSL — component sublayer
• PTN — Public Telephone Network
• QNC — Quick Net Connect
• SOHO — SOlar and Heliospheric Observatory
• MSG — Management Steering Group
• CSLIP — Compressed SLIP
• D3 — Digital channel bank, Third generation
• SLBM — Submarine-launched ballistic missile
• DPDCH — Dedicated Physical Data Channel
• VLR — Visitor Location Register
• CAP — Competitive Access Provider
• CMIS — Common Management Information Service
• USD — Universal Service Directive
• PC — Project Coordinator
• LSMS — Local Service Management System
• LVM — Line Verification Module
• TDRS — Tracking and Data Relay Satellites
• RANAP — Radio Access Network Application Part
• NMS — NetWare Management System
• JDC — Japan Digital Cellular
• ESDS — Electrostatic Discharge Sensitive
• SMAS — Service Management System
• BTL — Bell Telephone Laboratories, Inc.
• DLC — Digital Leased Circuit
• FDMMA — Frequency Division Multiplexing Multiple Access
• WBMP — Wireless Bitmap
• CVT — Circuit Validation Test
• WATS — Wide Area Telecommunications Service
• CSP — Converged Service Platform
• SASL — Simple Authentication and Security Layer
• TEM — Transmission Electron Microscope
• 3WC — Three Way calling
• UCA — Utility Communications Architecture
• TLC — Television the Learning Channel
• SMLC — Serving Mobile Location Center
• CSAP — Core Service Access Point

• IR — Information Request
• ZBTSI — Zero Byte Time Slot Interchange
• DCB — Digital Channel Bank (Sprint)
• DOITT — Department of Information Technology and Telecommunications
• CMAS — Cellular Management System
• HDB3 — High-Density Bipolar Three-bit substitution
• TCAP — Transaction Capabilities Application Part
• AFRINIC — African Network Information Centre
• AFIPS — American Federation of Information Processing Societies
• AEE — Agent Execution Environment
• WCMP — Wireless Control Message Protocol
• ARDIS — Advanced Radio Data Information Service
• MMJ — Modified Modular Jack
• DDS — Dataphone Digital Service (AT&T)
• ISD — International Subscriber Dialling
• DAF — Directory Access Function
• DACS — Digital Access and Cross-Connect System
• NARC — Non-Automatic Relay Center
• AAPR — Annual Average Performance Ratio
• ISDP — Intelligent Shared Dual Path
• STUN — Simple Traversal of UDP (User Datagram Protocol) through NAT (Network Address Translation)
• QOD — Quality of Data
• DTU — Data Terminal Unit
• ISTD — International Subscriber Trunk Dialing
• EDGE — Enhanced Data for GSM (Global System for Mobile communication) Evolution
• SH — Shell
• SS7 — Signaling System 7
• SSU — Stratospheric Sounding Unit (TOVS)
• QOSM — Quality of Service Management
• JWG — Joint Working Groupof
• SIGTRAN — Signaling Transport
• ATACS — Army Tactical Communications System
• CLASS — Custom Local Area Signaling Services
• MDCP — Media Device Control Protocol
• ARS — Automatic Route Selection
• AWS — Advanced Wireless Services
• BREW — Binary Runtime Environment for Wireless
• D/I — Drop and Insert
• ALT — Automatic Link Transfer
• ECA — Extended Calling Area
• RCQS — Roaming Call Quality Sensor
• COI — Community of Interest
• RCR — Research and Development Center for Radio Systems
• VGF — Voice Grade Facility
• USF — Universal Server Farm
• HBH — Hop-By-Hop
• CPCI — Compact Peripheral Component Interconnect
• WBTS — Wireless Business Telephone System
• ASA — Avaya Site Administration
• DMB — Disconnect and Make Busy

• TRANS — Transaction
• UCM — Use Case Map
• RTU — Right to Use
• SNI — Service Node Interface
• CHT — Active
• PI — Processor Interface
• ATL — Atlanta
• TFL — Telecom Fiji Limited
• ADTS — Automated Digital Terminal System
• FR-SSCS — Frame Relay Service Specific Convergence Sub-Layer
• WLNP — Wireless Local Number Portability
• WBOK — Wireless Broadband of Oklahoma
• NECA — National Exchange Carrier Association
• ISC — International Switching Center
• PM — Processable Mode