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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
• LAN — Local Area Network
• URL — Universal Resource Locator
• EDD — Earliest Due Date
• EBITDA — Earnings before Interest, Taxes, Depreciation and Amortization
• CBCU — Centralized Broadband Control Unit
• YTD — Year To Date
• DCE — Data Circuit-terminating Equipment
• ETA — Estimated Time of Arrival
• YMMV — Your Mileage May Vary
• OIC — Oh I See
• XML — Extensible Markup Language
• GFSK — Gaussian Frequency Shift Keying
• ECG — Electrocardiogram
• DWDM — Dense Wavelength Division Multiplexing
• DND — Do Not Disturb
• BRDF — Bidirectional Reflectance Distribution Function
• C3I — Command, Control, Communications & Intelligence
• CSR — Customer Service Representative
• DOE — Distributed Object Environment
• APR — Annual Percentage Rate
• CSMA/CA — Carrier Sense Multiple Access/Collision Avoidance
• ROM — Read-Only Memory
• YGWYPF — You Get What You Pay For
• CT — Computed Tomography
• FTP — File Transfer Protocol
• SYN — Synchronous
• THX — Thanks
• LASER — Light Amplification By Stimulated Emission Of Radiation (cf. Maser)
• BBS — Bulletin Board Service
• IQ — Intelligence Quotient
• RDF — Resource Description Framework
• IAMAI — Internet and Mobile Association of India
• CSMA/CD — Carrier Sense Multiple Access with Collision Detection
• OEM — Original Equipment Manufacturer (usually in reference to car parts)
• UK — United Kingdom of Great Britain and Northern Ireland
• NB — Nota Bene. Abbreviation of the Latin expression commonly used to emphasise the importance of a statement, literally meaning 'observe well'. Or less politely and more amusingly, No Bullshit.
• CCTV — Closed-circuit television
• ISAR — Inverse Synthetic-Aperture Radar
• PPM — parts per million
• X-BAR — Crossbar telephone exchange
• ANSI — American National Standards Institute, Inc.
• POC — Point Of Contact
• ASAP — As Soon As Possible (pronounced AY-sap)
• BTW — By The Way
• ATM — Automatic Teller Machine
• IT — Information Technology
• RTN — Regional Telecommunication Network

• ATOM — Any Transport over MPLS (Multi-Protocol Label Switching)
• RAEX — Roaming Agreement EXchange
• LED — Light-Emitting Diode
• XA-FR — Exchange Access Frame Relay
• C4I — Command, Control, Communications, Computers, & Intelligence
• S X S — Step-by-Step
• ISO — In Search Of
• LRU — Line Replaceable Unit
• NMSE — Normalized Mean Square Error
• BPM — Beats Per Minute
• MAN — Metropolitan Area Network
• TEMIP — Telecommunications Management Information Platform
• S-BCCH — Short Message Service Broadcast Control Channel
• P&L — Profit and Loss statement
• IRC — Internet Relay Chat
• X-OFF — Transmitter Off
• E-LEAD — Ear Lead
• C-NBAP — Common Node B Application Part
• EPA — Environmental Protection Agency (US)
• SD — Standard Deviation
• X-ON — Transmitter On
• CPU — Central Processing Unit
• UAX 14 — Unit Automatic eXchange type 14
• CU — See You
• FDIC — Federal Deposit Insurance Corporation
• OC-256 — Optical Carrier Signal, Level 256
• CR — Carriage Return
• COB — close of business (End of duty day)
• A-KEY — Authentication key
• B-ICI — Broadband Inter-Carrier Interface
• CSMA/CD — Carrier sense multiple access / collision detection
• FIFO — First In, First Out
• ZDBOP — Ziff-Davis Benchmark Operation
• CPE — Customer Premises Equipment
• WACN ID — Wide Area Communications Network IDentifier
• PDF — Portable Document Format (created by Adobe Acrobat)
• OC-18 — Optical Carrier Signal, Level 18
• CONG — Congestion message
• CSMA — Carrier Sense Multiple Access
• UR — Your
• ASTM — American Society for Testing and Materials (Philadelphia, Pennsylvania)
• LLC — Limited Liability Company
• FEMA — Federal Emergency Management Agency
• PDT — Pacific Daylight Time
• I.LINK — IEEE 1394, High Performance Serial Bus, implementation
• PDR — Preliminary Design Review
• IP — Internet Protocol
• RFP — Request For Proposal
• D-NBAP — Dedicated Node B Application Part
• F2F — Face To Face (also Meeting In Person)

• T-IC — T-interConnect
• SABGW — System Architecture Evolution Gateway
• ISO — International Organization for Standardization
• ATTN — Attention
• QC — Quality Control
• M-CSI — Mobility management CAMEL (Customized Applications for Mobile network Enhanced Logic) Subscription Information
• PO — Purchase Order
• DAHDI — Digium/Asterisk Hardware Device Interface
• CDR — Critical Design Review
• MLS — Microwave Landing System
• H323 — ANSI standard for format over IP
• OC-9 — Optical Carrier Signal, Level 9
• QFSK — Quadrature Frequency Shift Keying
• VIP — Very Important Person
• RFQ — Request For Quotation
• AC — Alternating Current
• AUP — Acceptable Use Policy
• RQMT — Requirement
• T-CARRIER — Trunk Carrier
• VC-ATOD — Virtual Clearinghouse on Alcohol, Tobacco and Other Drugs
• EAP — Employee Assistance Program
• RF — Radio Frequency
• ISP — Internet Service Provider
• CY — Calendar Year
• CEO — Chief Executive Officer
• IRR — Internal Rate of Return
• C³CM — Command, Control and Communications Countermeasures
• GSM — Global System for Mobile Communications
• KBYTE — Kilobyte (103)
• BRB — Be right back
• EDI — Electronic Data Interchange
• IPO — Initial Public Offering
• ECU — Electronic Control Unit
• WTG — Way To Go
• CCB — Change Control Board
• VAZO — Violating All-Zero Octet
• ACH — Automated Clearing House
• GUI — Graphical User Interface (goo-ey)
• API — Application Programming Interface
• DAM — Diagnostic Acceptability Measure
• CV — Curriculum Vitae
• WB — Welcome Back
• FET — Field Effect Transistor
• LCD — Liquid Crystal Display
• AMD — Advanced Micro Devices, Inc. (producer of computer chips)
• PVT — Private
• ATM — Asynchronous Transfer Mode
• MOU — Memorandum of Understanding (an MOU between Food & Drug Administratin and a regulatory agency in another country allows mutual recognition of inspections)
• WBS — Work Breakdown Structure
• BTU — British Thermal Unit

• TQM — Total Quality Management
• EST — Eastern Standard Time
• AFAIK — As Far As I Know
• O&M — Operation and Maintenance
• ADSL — Asymmetric Digital Subscriber Line
• SMTP — Simple Mail Transfer Protocol
• DBORS — Data Base of Records
• ASCII — American National Standard Code for Information Interchange
• MTBF — Mean Time Before Failure
• SME — Subject Matter Expert
• R&D — Research & Development
• PUHU — Pick Up Hang Up
• ABC — activity based costing
• VAT — Value Added Tax
• ADM — Add-Drop Multiplexer
• FAQ — Frequently Asked Questions (sometimes Pronounced Fak)
• D-H — Diffie-Hellman
• SLA — Service Level Agreement
• DOA — dead on arrival
• SRAM — Static Random Access Memory (ess-ram)
• DSC — Differential Scanning Calorimetry
• GIS — Geographic Information System
• WWW — World Wide Web
• ASA — American Standards Association
• MDF — Main Distribution Frame
• AIR — Account Information and Refill
• ICT — Information and Communication Technology
• MOB — Mobile
• AOL — America on line
• IRL — In Real Life
• RDY — Ready
• RPM — Revolutions Per Minute, (Rotations Per Minute)
• WML — Wireless Markup Language
• PDA — Personal Digital Assistant
• NPV — Net Present Value {economics}
• NSF — National Sanitation Foundation
• ARPA — Advanced Research Projects Agency (made early internet)
• CSA — Canadian Space Agency
• ASME — American Society of Mechanical Engineers
• EDS — Electronic Data Systems Corporation
• HTTP — Hypertext Transfer Protocol
• CUG — Closed User Group
• EOM — End Of Message
• MRI — Magnetic Resonance Imaging
• GPS — Global Positioning System (ex-NAVSTAR)
• EIS — Executive Information System
• MIS — Management Information System (OSHA)
• DWDM — Dense Wavelength-Division Multiplexing
• ABI — Application Binary Interface
• ESA — European Space Agency

• RPI — Retail Price Index
• 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
• VPN — Virtual Private Network (ATM)
• ACE — Access Control Entry
• GATT — General Agreement on Tariffs and Trade (government)
• CD — Compact Disc
• ATA — Area Transportation Authority
• COR — Carrier Operated Relay
• NYSE — New York Stock Exchange
• AM — Ante Meridian
• IVR — Interactive Voice Response (telephone technology)
• CRT — Cathode Ray Tube (type of TV)
• SAR — Search And Rescue
• EU — European Union (1994; formerly referred to as the EEC or EC)
• RFI — Request For Information. Sales department shorthand. Special priority when use in conjunction with RFN (see below).
• PCB — printed circuit board
• JV — Joint Venture
• CIO — Chief Information Officer
• TNYWR — The Number You Will Receive
• CAE — Computer-Aided Engineering
• TBD — To Be Determined
• NPI — New Product Introduction
• 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.
• DOD — United States Department of Defense
• DAC — Discretionary Access Control
• CGI — Common Gateway Interface
• ACK — Acknowledge (telecommunications; Cf. NAK)
• CPM — Critical Path Method
• BVR — Beyond Visual Range
• SOW — Statement Of Work
• QMS — Quality Management System
• SAN — Storage Area Network
• FX — Foreign Exchange
• RFC — Request For Comment
• RAM — random-access memory
• EVP — Executive Vice President
• DARPA — Defense Advanced Research Projects Agency (US)
• DSS — Decision Support System
• UDP — User Datagram Protocol (FDDI related)
• MST — Mountain Standard Time
• PGP — Pretty Good Privacy (encryption)
• VVX — Voice and Video eXchange
• PDH — Plesiochronous Digital Hierarchy
• RDBMS — Relational Database Management System
• ATCRBS — Air Traffic Control Radar Beacon System
• DBMS — Database Management System
• SWAG — Scientific Wild Ass Guess
• COO — Chief Operation Officer
• JIT — Just in time
• FAA — Federal Aviation Administration

• IETF — Internet Engineering Task Force
• ARP — Address Resolution Protocol (ATM)
• DES — Data Encryption Standard
• SDR — Special Drawing Rights
• FIPS — Federal Information Processing Standard
• AM — Amplitude Modulation
• TTYL — Talk To You Later (Internet Slang)
• CB — Call Back
• CAD — Computer Aided Designer
• AES — Advanced Encryption Standard
• AE — Account Executive
• NFS — Network File System
• CIR — Committed Information Rate (Frame Relay)
• EEC — European Economic Community (predecessor of the European Union|EU)
• ADD — Addendum
• CIS — Commonwealth of Independent States
• VM — Voice Mail
• MTTR — Mean Time To Repair
• RFO — Reason For Outage
• CRM — Customer Relationship Management
• ACK — ACKnowledgment
• QOS — Quality of Service
• WWW3 — World Wide Web Consortium
• DRAM — Dynamic Random Access Memory (dee-ram) (computing)
• DFD — Displaced Frame Difference
• AGC — Automatic Gain Control
• CDT — Central Daylight Time
• SDMA — Space Division Multiple Access
• EC — European Commission
• MBR — Master Boot Record
• ACM — Association for Computing Machinery
• CBT — Computer Based Training
• QA — Center for Quality Assurance in International Education
• DNS — Domain Name System
• SLIP — Serial Line Interface Protocol
• AIS — Automated Information System
• SQA — Software Quality Assurance
• TNX — Thanks
• OCR — Optical Character Recognition
• Q&A — Question & Answer
• DHCP — Dynamic Host Configuration Protocol
• RM — Regional Manager
• POP — Point Of Presence (Internet)
• NATO — North Atlantic Treaty Organisation
• BCC — Blind Carbon Copy
• WWW — World Weather Watch
• ACC — Adaptive Cruise Control
• CCSDS — Consultative/Consultative Committee for Space Data Systems
• CC — Carbon Copy
• HVAC — Heating, Ventilation, and Air Conditioning

• NOS — Network Operating System
• LRJ — Location Reject
• CPT — Carriage Paid To
• ISDN — Integrated Services Digital Network
• SDD — Software Design Document
• ATC — Air traffic control
• IRS — U.S. Internal Revenue Service
• AOA — Angle Of Arrival
• SAS — Statistical Analysis System
• WDM — Wavelength Division Multiplexing (fiber optics)
• ACE — Advanced Computing Environment
• CCM — counter-countermeasure
• MB — Megabyte
• SIC — Standard Industrial Classification (Code)
• NIH — Not Invented Here
• MSN — Microsoft Network
• ROI — Return on Investment
• TCO — Total Cost of Ownership
• GSA — U.S. General Services Administration
• WAN — Wide Area Network
• UPS — Ultraviolet Photoelectron Spectroscopy
• SCC — Standards Council of Canada
• PNG — Portable Network Graphics (graphic file standard/extension)
• BR — Branch
• PRI — Primary Rate Interface (ISDN)
• ADR — Address
• ECO — Engineering Change Order
• PDN — Public Data Network
• ENIAC — Electronic Numerical Integrator And Computer
• DNS — Domain Name Service
• DSL — Digital Subscriber Line
• DDD — Direct Distance Dial
• CST — Central Standard Time (UTC-6 Hours)
• GPRS — General Packet Radio Service
• DB — Decibel
• EDT — Eastern Daylight Time
• CAM — computer aided manufacturing
• PSK — phase-shift keying
• EFT — Electronic Funds Transfer
• UAV — Unmanned Aerial Vehicle
• BBS — Bulletin Board System
• DOJ — Department of Justice (US)
• BPS — bits per second
• WEP — Wired Equivalent Privacy
• CFO — Communication Filing Officer
• WYSIWYG — What You See Is What You Get (pronounced Wizzy-wig. See Entry For Derived Acronyms)
• PM — Preventive Maintenance
• SBU — Strategic Business Units
• NEC — National Electrical Code
• BSD — Berkeley Software Distribution

• 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
• DLL — Dynamic Link Library (computer file)
• AQL — Acceptable Quality Level
• ABET — Accreditation Board for Engineering and Technology, Inc.
• FFT — Fast Fourier Transform
• ERP — Enterprise Resource Planning
• EBCDIC — Extended Binary Coded Decimal Interchange Code (pronounced Eb-see-dik) (cf. BCD)
• APT — Automatic Picture Transmission
• DSCP — Differentiated Services Control Point
• NIST — National Institute of Standards and Technology
• BIP — Bit-Interleaved Parity
• 100BASE-T2 — 100 Megabits per Second, Baseband, Two-pair Category 3 UTP cables
• PC — Personal computer (host)
• DDE — Dynamic Data Exchange (in software parlance)
• CMS — Content Management System
• TNSTAAFL — There's No Such Thing As A Free Lunch
• FM — frequency modulation
• ACL — Access Control List
• LED — law enforcement desk; light emitting diode
• UTC — Coordinated Universal Time
• BUR — Bandwidth Usage Redundancy
• ASP — Application Service Provider
• UI — User Interface
• ROFL — Rolling on the floor laughing
• AATSR — Advanced Along-Track Scanning Radiometer
• RWR — Radar Warning Receiver
• CMM — Capability Maturity Model
• NTIS — National Technical Information Service Technology Administration
• RAID — Redundant Array of Inexpensive Disks
• ALC — Automatic Level Control
• ROS — Return on Sales
• CS — Computer Science
• MMS — Multimedia Messaging Service
• BST — British Summer Time
• AAC — Advanced Audio Coding
• SCSI — Small Computer System Interface
• ITU — International Telecommunication Union
• RQMTS — Requirements
• PM — post meridian
• PMA — Physical Medium Attachment
• ERT — Emergency Response Team
• BPR — Business Process Re-engineering
• PERT — Program Evaluation and Review Technique
• CAA — Civil Aviation Authority
• AME — Amplitude Modulation Equivalent
• EDVAC — Electronic Discrete Variable Automatic Computer
• CTD — Cumulative Trauma Disorder
• JAXA — Japan Aerospace Exploration Agency
• ZIP — Zone Improvement Plan
• IM — Instant Message

• MLS — Multiple Listing Service
• ADPE — Automatic Data Processing Equipment
• SOHO — Small Office Home Office
• NIC — Network Interface Card
• OMG — Object Management Group
• SEI — Software Engineering Institute
• DSA — Digital Signature Algorithm
• AT&T — American Telephone and Telegraph (U.S. company, also known as "Ma Bell")
• VHF — Very High Frequency
• AADC — Automated Area Distribution Center
• SQL — Structured Query Language
• Y2K — Year 2000
• DQPSK — Differential Quadrature Phase-Shift Keying
• DC — Direct Current
• CLI — Command line Interface (Cabletron)
• EEG — Electro-EncephaloGram
• AGP — Accelerated Graphics Port
• ISAKMP — Internet Security Association and Key Management Protocol
• ACD — Automatic Call Distributor
• EOT — End Of Transmission
• PECVD — Plasma-Enhanced Chemical Vapor Deposition
• SCM — Supply Chain Management
• 9 — Nine
• DMSP — Defense Meteorological Satellite Program (U.S.)
• NMR — Nuclear Magnetic Resonance
• ISBN — International Standard Book Number (ISO 2108)
• AAAS — American Association for the Advancement of Science
• SAIC — Science Applications International Corporation
• AAAI — American Association for Artificial Intelligence's
• FCC — Federal Communications Commission (US)
• IP — Intellectual Property
• B2B — Business to Businesse
• MRC — Monthly Recurring Charge
• DDL — Data Definition Language
• KISS — Keep It Simple Stupid
• TC — Telephone Call
• COQ — Cost Of Quality
• FAR — Federal Aviation Regulation
• OBO — Or Best Offer
• ASEAN — Association of South East Asian Nations
• BRI — Basic Rate Interface
• DQE — Detective Quantum Efficiency
• DME — Distance Measuring Equipment
• UN — United Narions
• RDP — Radar Data Processing
• DLR — Design Layout Record
• LEO — Low Earth Orbit (satellite communications)
• OSHA — Occupational Safety and Health Act (1970)
• DCN — Design Change Notification
• EMG — Electromyogram

• LMS — Learning management system
• ATN — Aeronautical Telecommunication Network
• DOS — Disk Operating System
• DTE — Data Terminal Equipment
• PST — Pacific Standard Time (UTC-8 Hours)
• DCOM — Distributed Component Object Model
• AD — Active Directory
• ADM — Add/Drop Multiplexer
• VIRUS — Vital Information Resources Under Siege
• AES — Auger Electron Spectroscopy
• HDML — Handheld Device Markup Language
• CU — Control Unit
• STS — Space Transportation System
• ABR — Available Bit Rate
• SPC — Statistical Process Control. Forerunning quality theory from the 1960s to TQC and TQM.
• HZ — cycles per second (hertz)
• NTIA — National Telecommunications and Information Administration
• AC — Access Control
• SBC — Southwestern Bell Corporation
• PM — Project Manager
• CFE — Contractor-Furnished Equipment
• RACON — Radar Beacon
• CCSD — command communications service designator; control communications service designator
• EFF — Electronic Frontier Foundation
• AT&T — American Telephone & Telegraph
• ASR — Airport Surveillance Radar
• WIPO — World Intellectual Property Organization
• STP — standard temperature and pressure (0° and 1 atm)
• CDR — Call-Detail Record
• NEMA — National Electric Manufacturer's Association
• BT — British Telecommunications
• SVP — Senior Vice President
• MHS — Message Handling System (electronic)
• TCP — Transmission Control Protocol
• CIA — Central Intelligence Agency
• NA — Not Applicable
• EEPROM — Electrically Erasable Programmable Read-Only Memory
• ISSN — International Standard Serial Number (ISO 3297)
• CMI — Computer Managed Instruction
• DFS — Distributed File System
• RNC — Radio Network Controller
• RM — Resource Management
• AWG — American Wire Gauge
• CORBA — Common Object Request Broker Architecture
• RFD — Request For Discussion
• ACO — Additional Call Offering
• IANA — Internet Assigned Numbers Authority
• JPEG — Joint Photographic Experts Group (24-bit image storage format)
• VTC — Video Teleconference
• W3C — World Wide Web Consortium

• Z — Zero
• EPR — Ethylene-Propylene Rubber
• OFC — Office
• EW — Electronic Warfare
• BSOD — Blue Screen Of Death
• WMO — World Meteorological Organization (ICSU)
• USD — United States Dollar
• USB — Universal Serial Bus
• CRL — Certificate Revocation List
• EAP — Extensible Authentication Protocol
• T&C — Terms & Conditions
• ADT — Atlantic Daylight Time (UTC-3 Hours)
• VAC — Vacant
• ARA — Apple Remote Access
• EISA — Extended Industry Standard Architecture
• DTI — Department of Trade and Industry (UK)
• NOAA — National Oceanic and Atmospheric Administration (US)
• EDD — Envelope Delay Distortion
• CUL — See You Later
• BJT — Bipolar Junction Transistor
• CAUCE — Coalition Against Unsolicited Commercial Email
• WTO — World Trade Organisation
• ATS — applications technology satellite
• PT — Project Team
• MIME — Multipurpose Internet Mail Extension
• CIM — Common Information Model
• ISS — International Space Station
• ASQC — American Society for Quality Control's
• HSD — High Speed Data
• ITSEC — Information Technology Security Evaluation Criteria
• RU — Are You?
• PBX — Private Branch eXchange (company phone system)
• SHA — Secure Hash Algorithm
• AVHRR — Advanced Very High Resolution Radiometer  
• APPL — Application
• CHAP — Challenge Handshake Authentication Protocol (ATM)
• DSTE — Digital Subscriber Terminal Equipment
• CM — Configuration Management
• UHF — Ultra High Frequency (300-3000 MHz; 1m-10cm)
• AFC — Automatic Frequency Control
• ECP — Engineering Change Proposals
• VR — Virtual Reality
• SSL — Secure Socket Layer
• AF — Audio Frequency
• TCP/IP — transmission control protocol/internet protocol
• KM — Knowledge Management
• CRBT — Caller Ring Back Tone
• EOB — End Of Business
• DSSS — Direct Sequence Spread Spectrum
• SOGA — Share of Gross Adds

• FASB — Financial Accounting Standards Board
• DTX — Discontinuous Transmission
• SAE — Society of Automotive Engineers
• ICANN — Internet Corporation for Assigned Names and Numbers
• ACTV — Active
• PPB — parts per billion (109)
• CRC — Contrôle de Redondance Cyclique (French: Cyclic Redundancy Check)
• ASK — amplitude shift keying
• LEC — Local Exchange Carrier
• RPC — Remote Procedure Call
• ESF — Extended Super Frame (ATM)
• AE — Application Entity
• SNMP — Simple Network Management Protocol (ATM)
• ECR — Electronic Cash Register
• TV — Television
• FDDI — Fiber Distributed Data Interface
• BPRZ — Bipolar Return-to-Zero
• WAP — Wireless Application Protocol
• ISRO — Indian Space Research Organisation
• AEC — Architecture, Engineering, Construction
• B3ZS — bipolar 3-zero substitution
• ECE — Economische Commissie voor Europa (United Nations) (Dutch: Economic Commission for Europe)
• I/O — Input/Output
• ADN — Advanced Digital Network
• SMS — Short Message Service
• TCB — Trusted Computing Base
• NAFTA — North American Free Trade Agreement
• NIST — National Institute of Standards & Technology (US)
• ATM — Adobe Type Manager
• FTTB — Fiber To The Building
• FCA — Free Carrier
• ICMP — Internet Control Message Protocol
• MIPS — Millions of Instructions Per Second
• CRIS — Carrier Route Information System
• BCD — Binary-Coded Decimal
• PSTN — Public Switched Telephone Network
• RFI — Radio Frequency Interference
• M — Meter
• RSVD — Reserved
• QI — Quality Improvement
• B2C — Business-to-Consumer
• USGS — United States Geological Survey (DOI)
• CW — Continuous Wave
• OM — Old Man
• IMEI — International Mobile Equipment Identity
• AP — Application Protocol
• SML/SMS — Service Management Layer/Service Management Service
• NRC — National Research Council (Canada)
• MAC — Message Authentication Code
• BNSC — British National Space Centre

• AVL — Available
• DC — Disconnected
• APIC — Advanced Programmable Interrupt Controller
• NSA — National Security Agency
• PE — Polyethylene
• MDA — Monochrome Display Adapter
• YL — Young Lady
• LF — Low Frequency
• HSDPA — High-Speed Downlink Packet Access
• AMT — Amount
• AXE 10 — Series of electronic telephone exchanges from L.M. Ericsson
• NCSA — National Center for Supercomputing Applications
• FCS — Frame check sequence (Ethernet)
• MAC — Media Access Control
• ACPI — Advanced Configuration and Power Interface
• OSI — Open Systems Interconnection (iso Standard)
• SLF — Super Low Frequency
• HW — Hardware
• BIS — Bureau of Indian Standards
• RCU — Remote Control Unit
• CCIS — Common Channel Interoffice Signaling
• ADT — Abstract Data Type
• LQC — Line Quality Control
• BECN — Backward Explicit Congestion Notification
• SIG — Special Interest Group
• BUS — Business
• D-RAM — Dynamic Random Access Memory
• ASQ — Alpha System Qualification
• BER — Bit-Error Rate
• PAR — Precision Approach Radar
• EDP — Electronic Data Processing Plc (London Stock Exchange [LSE])
• KHZ — kilohertz (1000 cycles per second)
• ATF — Advanced Tactical Fighter
• BBU — Baseband Unit
• CBC — cipher block chaining
• CMP — Connection Management Protocol
• SP — Service Provider
• WB — Write Back
• SPC — Stored Program Control
• TOS — Type Of Service
• BYOD — Bring Your Own Device
• AMI — Advanced Metering Infrastructure
• NMT — Nordic Mobile Telephone
• DMA — direct memory access (computer term)
• LCP — Link Control Protocol
• CIS — CompuServe Information Service
• RMS — root mean square (preferred over "RMS")
• CIC — Circuit Identification Code
• PWD — Password
• MS — Millisecond

• NBS — National Bureau of Standards (US)
• JIS — Japanese Industrial Standard
• SGML — Standard Generalized Markup Language
• OS — Operating System
• DMTS — Distinguished Member Of Technical Staff
• QAM — quadrature amplitude modulation
• EEHO — Either End Hop Off
• RFS — Request For Service
• ELINT — Electronic Intelligence Satellite
• CSO — Customer Service Operations
• PLD — Programmable Logic Device
• MF — Medium Frequency
• ROTFL — Roll On The Floor Laughing
• CES — Consumer Electronics Show
• EMS — Express Mail Service
• PPP — Point-to-Point Protocol
• EGA — Enhanced Graphics Adapter
• BS — Base Station
• ECMA — European Computer Manufacturer's Association
• PABX — private automatic branch exchange (telephone)
• PVC — Permanent Virtual Circuit (ATM)
• LP — Low Pressure
• OSS — Operational Support System
• RSN — Real Soon Now [which may be a long time coming]
• MMU — Memory Management Unit
• SIT — Static Induction Transistor
• CDMA — Code Division Multiple Access (voice/data transmission)
• ELF — Extremely Low Frequency
• RTU — Remote Terminal Unit
• AYT — Are You There
• LD — Long Distance
• MGMT — Management
• 100BASE-T — 100 Megabits per second, Baseband, Twisted pair
• CMD — Command
• SNR — Signal-to-Noise Ratio
• AT — Advanced Technology
• IEC — International Electrotechnical Commission
• C4 — Command, Control, Communications, and Computers
• GRE — Generic Routing Encapsulation
• PDU — Protocol data unit (such as segment, packet, frame, etc.)
• CFD — computational fluid dynamics
• ADF — Automatic Direction Finder
• SXS — Step-By-Step
• EMC — Electromagnetic Compatibility
• SDH — Synchronous Digital Hierarchy (ATM)
• PET — positron emission tomography
• ISAS — Institute of Space and Astronautical Sciences (Japan)
• OSPF — Open Shortest Path First (ATM)
• DCE — Distributed Computing Environment
• CERT — Computer Emergency Response Team

• HTTPS — HyperText Transfer Protocol Secure
• ACT — ACTIVITY, ACTIVITIES
• AS — Autonomous System
• CGI — Computer-Generated Imagery
• TAG — Technical Advisory Group for Biological Control Agents of Weeds
• DOM — Document Object Model
• FSAI — Fiber Serving Area Interface
• ACFQ — Absence Compensation Fair Queuing
• JST — Japan Standard Time
• RIP — Routing Information Protocol
• ISMI — International mobile subscriber identity
• TPDU — Transport Protocol Data Unit
• RACF — Resource Access Control Facility
• CATV — Cable Television
• PD — Public Domain
• ANI — Automatic Number Identification (Caller ID)
• NIMBY — Not In My Back Yard
• VB — Visual Basic
• BIOS — Basic Input Output System
• ERP — Enterprise Resource Management
• JPL — Jet Propulsion Laboratory (California Institute of Technology) (NASA)
• MS — Mobile Station
• IRS — Interface Requirements Specification
• 3G — Third Generation mobile phone network
• HTML — Hyper Text Markup Language
• CMC — Career Management Center
• DASD — Direct Access Storage Device
• LDAP — Lightweight Directory Access Protocol (pronounced Ell-dap)
• RCC — Rescue Coordination Center
• ADC — Analog-Digital Converter
• UAS — Unavailable Seconds
• DOT — Department of Telecommunications (India)
• DUP — Duplicate
• MPLS — Multi Protocol Label Switching
• SIL — Speech Interference Level
• URI — Uniform Resource Identifier
• DSA — Directory System Agent
• MOS — Model Output Statistics
• DLC — Digital Loop Carrier
• CHF — Swiss Franc
• VBR — Variable Bit Rate (ATM)
• CFA — Carrier Facility Assignment
• TAC — Technical Assistance Center
• TTYL — Type To You Later
• CG — Coast Guard
• LCN — Logical Channel Number
• LPE — Liquid Phase Epitaxy
• GB — Gigabyte
• CCNA — Cisco Certified Network Associated
• DSP — Digital Signal Processor

• NAS — Network Access Server
• TLS — Transport Layer Security
• APC — American Power Conversion
• DIT — Directory Information Tree
• DRM — Digital Rights Management
• AIS — Alarm Indication Signal
• BLOS — Beyond Line-Of-Sight
• EAI — Enterprise Application Integration
• RH — Relative Humidity
• SCADA — Supervisory Control And Data Aquisition
• YAHOO — You Are Hazy Over Oranges
• IRDA — Infrared Data Association
• FCW — Federal Computer Week
• PIN — Personal Identification Number
• ISO — Infrared Space Observatory
• MS — Message Store
• WLTF — Wireless LAN (Local Area Network) Task Force
• HDLC — High-Level Data Link Control
• JSC — Johnson Space Center (Houston, TX)
• 911 — Emergency Services Phone Number
• ESTEC — European Space Research and Technology Centre
• MIC — Message Integrity Check
• STM — Short Term Memory
• YP — Yellow Pages
• PLMN — Public Land Mobile Network
• VXML — Voice eXtensible Markup Language
• RAD — Rapid Application Development
• VCC — Virtual Channel Connection (ATM)
• RSVP — Resource Reservation Protocol (Internet)
• PDS — Protected Distribution System
• BOFH — Bastard Operator From Hell
• CIM — Corporate Information Management
• FCA — Free Carrier Absorption
• WAFB — Wireless Absolute Fairness Bound
• MCD — Magnetic Circular Dichroism
• NESDIS — National Environmental Satellite, Data, and Information Service
• DTR — Data Terminal Ready
• LLC — Logical Link Control
• DNIS — Dialed Number Identification Service
• FTTH — Fiber To The Home
• VOL — Volume
• RAN — Radio Access Network
• IMPACT — Integrated Manufacturing Precision Assembly Cellular Technology
• ME — Mobile Equipment
• CATV — Community Antenna Television
• ASI — Asynchronous Serial Interface
• CAM — Computer-Aided Mapping
• BG — Background
• CFV — Call For Vote(s)
• ADP — Automatic Data Processor

• PRF — Pulse Repetition Frequency
• BPDU — Bridge Protocol Data Unit
• CG — Center of Gravity (DXS)
• MVS — Multiple Virtual Storage
• VAS — Value Added Services
• CFD — Call For Discussion
• MS — Management System
• DMX — De-MultipleXer
• LLU — Local Loop Unbundling
• APS — Automatic Protection Switching (SONET/SDH)
• LF — Line Feed
• IW — Information Warfare
• STA — State
• UPS — Uninterruptible Power Supply
• ARPU — Average Revenue Per User
• HF — High Frequency
• DT — DWDM (Dense Wavelength Division Multiplexing) Terminal
• RJ-14 — Registered Jack type 14 (2-wire connector)
• AR — Access Rate
• WORM — Write-Once, Read-Many
• CBEMA — Computer & Business Equipment Manufacturers Association
• SW — South West
• MTSO — Mobile Telephone Switching Office
• SPA — Special Prorate Agreement
• WPAN — Wireless Personal Area Network
• 1000BASE-T — 1000 Megabits per Second, Baseband, Twisted Pair
• PCMCIA — Personal Computer Memory Card International Association
• DCS — Digital Cross-connect System
• AT — Access Tandem
• DPC — Destination Point Code
• CAD — Computer-Aided Design
• AMI — Alternate Mark Inversion
• ITT — Invitation To Tender
• BAN — Base Area Network
• BGP — Border Gateway Protocol (routing protocol)
• PAN — Personal Area Network
• CAB — Conformity Assessment Body
• ECN — Explicit Congestion Notification
• CEV — Controlled Environment Vault
• VDS — Variable Depth Sonar
• IRLAN — Infrared LAN
• OMS — Optical Multiplex Section
• FC — Fibre Channel
• TM — Technical Manual
• DCMI — Dublin Core Metadata Initiative (Online Computer Library Center)
• SOAP — Simple Object Access Protocol
• CO — Certificate of Origin
• MIB — Management Information Base (ATM)
• CA — Certificate Authority
• 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)

• DID — direct inward dial
• CLNP — ConnectionLess-mode Network Protocol
• CDS — Cell Directory Service
• VOIP — Voice Over IP (Internet Protocol)
• MCSD — Microsoft Certified Solution Developer
• OLE — Object Linking and Embedding (Microsoft communication protocol)
• PCI — Peripheral Component Interconnect
• MDA — Model Driven Architecture
• NIC — Network Information Center
• WMAN — Wireless Metropolitan Area Network
• DUC — Digital Up-Converter
• OTN — Optical Transport Network
• MBPS — Megabits per second
• SEM — Space Environment Monitor
• DSN — Deep Space Network - network of large antennas and communication facilities.
• CRO — Central Records Office
• VLF — Very Low Frequency
• CIFS — Common Internet File System
• IS — Intermediate System
• NOC — Network Operations Center
• FAX — Facsimile
• AMHS — Automated Message Handling System
• IPX — Internetwork Packet Exchange
• NCS — National Communications System
• BRA — Basic Rate Access
• EEA — European Economic Area
• AU — Audio Unit
• CBDS — Connectionless Broadband Data Service
• POTS — Plain Old Telephone Service (FCW)
• SAR — Specific Absorption Rate
• PPARC — Particle Physics and Astronomy Research Council
• MHS — Microwave Humidity Sounder
• UML — Unified Modeling Language (Object Management Group, OMG)
• STI — Speech Transmission Index
• IMSI — International Mobile Subscriber Identity
• SSM — Source-Specific Multicast
• TEL — Telephone
• IS — International Standard
• CS — Cable Select
• DAP — Directory Access Protocol
• PCM — Pulse-Code Modulation
• TG — Task Group
• ASIC — application-specific integration circuit
• E — Energy
• E — Echo Time Zone
• DA — Destination Address
• ACR — Attenuation Crosstalk Ratio
• CABS — Carrier Access Billing System
• NOTAM — Notice to Airmen
• NLMS — Normalized Least Mean Square

• CAV — Constant Angular Velocity
• COMINT — Communications Intelligence
• SKU — Stockkeeping Unit
• APM — Advanced Power Management
• PAL — Programmable Array Logic
• HSS — Home Subscriber Server
• VM — Virtual Machine
• AOI — Area Of Interest
• AMLCD — Active Matrix Liquid Crystal Display
• COO — Cost of Ownership
• VOC — Volatile Organic Compounds (air pollution)
• ARG — Argument
• TB — Terabyte
• BT — BlueTooth
• MCU — Multipoint Control Unit
• DIBL — Drain-induced Barrier Lowering
• MIS — Management Information Service
• AFSK — Audio Frequency Shift Keying
• RJ-25 — Registered Jack type 25 (6-wire connector)
• ISA — Industry Standard Architecture
• WG — Working Group
• DIS — Distributed Interactive Simulation
• CGM — Computer Graphics Metafile
• PAP — Password Authentication Protocol (ATM)
• RSRQ — Reference Signal Received Quality
• AML — Amplitude Modulated Link
• IDT — Integrated Digital Terminal
• UAN — Universal Access Number
• ASTD — American Society of Training and Development (Alexandria, Virginia)
• WLAN — Wireless Local Area Network
• RCV — Receive
• OAM&P — Operations, Administration, Maintenance & Provisioning
• ASR — Automatic Speech Recognition
• ADCCP — Advanced Data Communications Control Procedures
• MTU — Maximum Transmission Unit
• AFS — Andrew File System
• RTS — Request To Send
• GOS — Grade Of Service
• CC — Call Control
• NIS — Network Information Service
• ISI — Inter-Symbol Interference
• NTFS — New Technology File System
• CICS — Customer Information Control System (IBM Mainframe Software; Kicks Or C-I-C-S)
• 2W — Two Wire
• COM — Component Object Model
• CCTA — Central Computer and Telecommunications Agency
• LIU — Line Interface Unit
• AEW — Airborne Early Warning
• PDN — Packet Data Network
• FR — Frame Relay

• LPC — Linear Predictive Coding
• SVC — Scalable Video Coding
• CF — Compact Flash
• VOD — Video On Demand
• WAR — Weekly Activity Report
• ESF — Edge Spread Function
• DS — Digital Signal
• ATSR — Along-Track Scanning Radiometer
• IIS — Internet Information Services
• COMJAM — Communications Jamming
• SCTP — Stream Control Transmission Protocol
• JVM — Java Virtual Machine
• SVD — Singular Value Decomposition
• TS — Technical Specification
• ECT — Explicit Call Transfer
• LR-WPAN — Low-Rate Wireless Personal Area Network
• TCSEC — Trusted Computer System Evaluation Criteria
• EPR — Electron Paramagnetic Resonance
• ZIP — Zone Information Protocol
• FAT — File Allocation Table
• MME — Mobility Management Entity
• VLL — Virtual Leased Line
• PKI — Public Key Infrastructure (cryptography)
• ES — Errored Second
• CPN — Cisco Powered Network
• GDM — GSM (Global System for Mobile communications) Data Module
• LSR — Local Service Request
• NSAI — National Standards Authority of Ireland
• EPABX — Electronic Private Automatic Branch Exchange
• WS — Workstation
• ARIN — American Registry for Internet Numbers
• ARINC — Aeronautical Radio Incorporated
• OAS — Organization of American States
• RT — Radiotelephone
• CBP — Coded Block Pattern
• TE — Traffic Engineering
• 100BASE-T4 — 100 Megabits per Second, Baseband, Four-pair Category 3 UTP cables
• EMR — Electromagnetic Radiation
• MSU — Microwave Sounding Unit
• IMC — Intermediate Metal Conduit
• DDCMP — Digital Data Communications Message Protocol
• FCP — Fibre Channel Protocol
• EC — European Community
• NLM — National Library of Medicine (National Institutes of Health)
• ESS — Electronic Switching System
• ECPA — Electronic Communications Privacy Act 1986
• DDS — Digital Data Service
• F — Fellow
• ADL — Advanced Distributed Learning
• B-ISDN — Broadband Integrated Services Digital Network

• CCD — Charge Coupled Device - a device for the movement of electrical charge.
• AIFF — Audio Interchange File Format
• FXO — Foreign Exchange Office
• TIA — Telecommunications Industry Association
• WPM — speech--words per minute
• RCS — Radar Cross Section
• UA — User Agent
• CAC — Carrier Access Code
• SLP — Service Location Protocol
• EAC — Engineering Accreditation Commission
• RDF — Radio Direction Finder
• FUP — Fair Use Policy
• CAN — Campus Area Network
• ADEOS — ADvanced Earth Observing Satellite (Japan)
• OTS — Optical Transmission Section
• MPI — Message Passing Interface
• BOC — Bell Operating Company
• DCP — Design Change Package
• UL — Uplink
• MMSI — Maritime Mobile Service Identity
• ARQ — Automatic Repeat-reQuest
• EHF — Extremely High Frequency
• LZ — Landing Zone
• BS — Beam Splitter
• GHZ — Gigahertz
• IN — Intelligent Network
• TKIP — Temporal Key Integrity Protocol
• MC — Message Center
• NOAO — National Optical Astronomy Observatories (Tucson, AZ)
• ASR — Access Service Request
• APN — An Access Point Name
• RARP — Reverse Address Resolution Protocol
• HEHO — Head End Hop Off
• SPGA — Staggered Pin Grid Array
• CTS — Clear To Send
• EMS — Enhanced Messaging Service
• TEC — Total Electron Content
• TOP — Technical Office Protocol
• COAX — Coaxial
• SATAN — Security Administrator Tool for Analyzing Networks
• AFP — AppleTalk Filing Protocol
• ECAC — European Civil Aviation Conference
• STP — Spanning Tree Protocol
• E&M — ear and mouth (special signaling leads)
• RRN — Routing Recording Number
• NMS — Network Management System
• CSPRM — Common Signaling Protocols Resource Module
• YYP — Yahoo Yellow Pages
• NFPA — National Fire Protection Association
• SM — Senior Member

• CT — Computer Telephony
• TWT — Traveling Wave Tube
• BERT — Bit Error Rate Tester (telecommunication)
• TBD — To Be Decided
• SDM — Service Delivery Management
• ISO — Independent System Operator (US) (see also TSO) Responsible for grid management, but does not own assets. (electricity)
• IV — Initialization Vector
• SHF — Super High Frequency
• KB — Kilobyte: One thousand and twenty-four bytes kbps kilo bit per second
• MD — Mediation Device
• MSE — Mobile Subscriber Equipment
• NI — Network Interface
• SA — Scientific American
• OCC — Occupancy
• SBC — Session Border Controller
• HDSL — High-bit-rate Digital Subscriber Line
• BSA — Business Software Alliance
• GDS — Global Distribution System
• SPI — Service Provider Interface
• VOP — Voice Over Packet
• CPS — Cycles Per Second (now Hertz)
• PSD — Phase-Sensitive Detector
• P — Predicted
• MPEG — Motion Picture Experts Group
• FA — Functional Area
• OLAP — Online Analytical Processing
• ADF — automatic document feeder
• TI — Time Interval
• CD — Critical Dimension
• ELT — Emergency Locator Transmitter
• CSAT — Customer Satisfaction
• LNP — Local Number Portability
• ITP — Interactive Telecommunications Program
• BCH — Binary Coded Hexadecimal
• DX — Duplex
• DMARC — Demarcation point
• DDN — U.S. Defense Data Network
• RSS — Really Simple Syndication
• CSA — Canadian Standards Association (like UL)
• EAS — Extended Area Service
• OSTP — Office of Science and Technology Policy
• SDK — Software Development Kit (Microsoft)
• PGA — Programmable Gate Array
• RP — Reference Point
• CMT — Cadmium Mercury Telluride
• LSF — Line Spread Function
• STP — Signal Transfer Point
• M — Management
• TCR — Temperature Coefficient of Resistance
• OMA — Open Mobile Alliance

• BACP — Bandwidth Allocation Control Protocol
• TRLR — Trailer
• WWAN — Wireless Wide Area Network
• AAS — Adaptive Antenna System
• OD — Outside Diameter
• AAV — Accountholder Authentication Value
• TO — Technical Order
• SPADATS — Space Detection And Tracking System
• MP — Multilink Protocol
• STK — Satellite Tool Kit
• LEN — Line Equipment Number
• TOS — Temporarily Out of Service
• KDC — Kerberos Key Distribution Center
• EMS — Element Management System (ATM)
• TELECOMMUTE — Telecommuting
• PTA — Pakistan Telecommunication Authority
• IP — Intelligent Peripheral
• CDA — Command and Data Acquisition
• ABBR — Abbreviation
• BER — Basic Encoding Rules (ASN.1)
• EGP — Exterior Gateway Protocol
• MCA — Micro Channel Architecture
• YABA — Yet Another Bloody Acronym
• MSR — Microwave Scanning Radiometer
• QPSK — aeronautical quadrature phase shift keying
• SCP — Service Control Point
• LRC — Learning Resource Center
• ATS — Automatic Transfer Switch
• FSK — Frequency-Shift Keying
• AFM — Atomic Force Microscopy
• NNTP — Network News Transfer Protocol
• IRQ — Interrupt Request
• PIM — Personal Information Manager
• DID — data item description
• ECM — Electronic Counter Measures
• TN — Telephone Number
• MIT — Massachusetts Institute of Technology (U.S.)
• ROSAT — Roentgen Satellite
• PUB — Publication (file name extension)
• OC — Optical Carrier
• CO — Central Office
• Y — Yttrium
• LEP — Large Electron Positron
• DSLAM — Digital Subscriber Line Access Multiplexer (Module)
• IS — Information System
• EX — Exercise
• MAJ — Major
• CU — Channel Unit
• FMC — Fixed Mobile Convergence "Mobile UC or Unified Communications over Wireless"
• ARC — Army Reuse Center

• SDLC — Synchronous Data Link Control
• FE — Far End
• CC — Country Code
• IPVX — Internet Protocol version X
• LQR — Linear Quadratic Regulator
• TLC — The Learning Channel
• DBS — Direct Broadcast Satellite
• ABN — Abnormal
• DSS — Digital Signature Standard
• SLAM — Scanning Laser Acoustic Microscope
• AUD — Audit
• WTLS — Wireless Transport Layer Security
• TRM — Technical Reference Model
• MLP — Mobile Location Protocol
• SOS — Save Our Souls (Help!)
• FITS — Flexible Image Transport System
• FR PVC — Frame Relay Permanent Virtual Connection
• TCPA — Telephone Consumer Protection Act
• AAF — Advanced Authoring Format
• NCP — Network Control Protocol
• TDMA — Time Division Multiple Access
• SML — Service Management Layer
• MCC — Mission Control Center (JSC)
• RA — Risk Analysis
• ODBC — Open Database Connectivity
• AMPS — Advanced Mobile Phone System
• NE — North-East
• IESG — Internet Engineering Steering Group
• DTD — Document Type Definition (XML)
• PDC — Personal Digital Cellular
• STN — Station Casinos, Inc.
• ACT — Activity
• CAMA — Centralized Automatic Message Accounting
• BIU — Bus Interface Unit
• EFS — Encrypting File System
• AIN — Advanced Intelligent Network
• VC — Virtual Channel
• PUK — PIN (Personal Identification Number) Unlocking Key
• PDS — Planetary Data System
• OTA — Office of Technology Assessment (U.S.; abolished by Congress, Fall 1995)
• 4W — Four-Wire
• PROM — Programmable Read-Only Memory
• SEC — Software Engineering Center
• RT — Remote Terminal
• LU — Logical Unit
• FE — Finite Element
• ARPANET — ARPA Network
• ACAP — Application Configuration Access Protocol
• DVP — Digital Voice Privacy
• ADT — American District Telegraph Company

• NCSC — National Computer Security Center (NSA)
• CPS — characters per second
• CI — Common Interface
• SAR — synthetic aperture radar (satellite)
• VGA — Video Graphics Array
• OPC — Originating Point Code
• BELLCORE — Bell Communications Research, Inc.
• DCS — Digital Cross-Connect
• TDOA — Time Difference Of Arrival
• JCL — Job Control Language
• DII — Defense Information Infrastructure
• TCIC — Trunk Circuit Identification Code
• ACF — Access Control Field
• EIP — Equipment installation procedure
• WINS — Windows Internet Name Service
• SVC — Switched Virtual Connection
• HEX — Hexadecimal (base 16)
• EMCON — Electromagnetic Emission Control
• BIP — Band Interleaved by Pixel
• MOL — Manned Orbiting Laboratory
• FWA — Fixed Wireless Access
• SD — Software Development
• LT — Line Termination
• SAN — System Area Network
• ETS — European Telecommunication Standard
• DEC — Decimal
• SUS — Suspension
• BOD — Bandwidth on Demand
• ECP — Encryption Control Protocol
• BHCA — Busy Hour Call Attempt
• MEID — Mobile Equipment Identifier
• TE — Terminal Equipment
• BTAM — Basic Telecommunications Access Method
• MSRN — Mobile Station Roaming Number
• TE — Test Equipment
• ORB — Object Request Broker
• DSN — Defense Switched Network
• FAA — Federal Aviation Agency
• DID — Digital Information Display
• DL — Digital Library
• PVD — Physical Vapor Deposition
• DCN — Disconnect
• WPS — Wireless Priority Service
• VSAT — Very Small Aperture Terminal (satellite service)
• CBR — Constant Bit Rate
• ISOC — Internet Society
• 10BASE-T — 10 Megabits per second, Baseband, Twisted pair
• AWACS — Airborne Warning And Control System
• TXM — Transmission X-ray Microscope
• SRS — Software Requirements Specifications

• DAT — Digital Audio Tape
• AP — access point
• CAPS — Call Attempts Per Second
• NNM — Network Node Manager
• POE — power over ethernetinjector
• TDM — Time Division Multiplexer
• DAL — Dedicated Access Line
• AMSS — Automatic Message Switching System
• NRPB — National Radiological Protection Board
• ATC — Advanced Technology Center
• DIS — Draft International Standard
• CER — Cell Error Ratio
• NSS — Network Switching Subsystem
• ASARS — Advanced Synthetic Aperture Radar System
• Y — Yes
• 3GPP — Third Generation Partnership Project
• CNM — Customer Network Management
• CFNRY — Call Forwarding on No Reply
• IEEE — Institute of Electrical and Electronics Engineers
• B6ZS — Bipolar 6 Zero Substitution
• COMDEX — Computer Dealers Exposition
• COPS — Common Open Policy Service
• IEEE-SA — Institute of Electrical and Electronics Engineers - Standards Association
• CTU — Central Terminal Unit
• TOA — Time Of Arrival
• EMEA — Europe, Middle East and Africa
• ADB — Apple Desktop Bus
• SITA — Société Internationale de Télécommunications Aéronautiques
• EIGRP — Enhanced Interior Gateway Routing Protocol
• NIC — Network Interface Controller
• NTP — Network Time Protocol
• TL1 — Transaction Language 1
• MCP — Microsoft Certified Professional
• RAU — Radio Access Unit (Army)
• MX — Mixer
• WK — Week
• TTY — Teletype Telex Machine
• METRO — Metropolitan
• PEM — Privacy-Enhanced Mail
• AMR — Automated meter reading also known as Automatic Meter Reading
• BTC — Botswana Telecommunications Corporation
• ACLR — Adjacent Channel Leakage Ratio
• A — Anode
• SMI — Structure of Management Information
• MOD — Modify
• DCS — Digital Cellular System
• B2B — Business-to-Business
• CDE — Common Desktop Environment
• WHT — Walsh-Hadamard Transform
• MUSIC — MUltiple SIgnal Classification

• DPL — Digital Private-Line
• SONET — Synchronous Optical Network
• B3G — Beyond Third Generation
• IRS — Inertial Reference System
• VLSI — Very-Large-Scale Integration
• DVMRP — Distance Vector Multicast Routing Protocol
• DCE — Data Communication Equipment
• JRE — Java Runtime Environment
• KAK — Key-Auto-Key
• CB — Common Battery
• RT — Response Time
• VT — Virtual Terminal
• ATA — Analog Telephone Adapter
• MBWA — Mobile Broadband Wireless Access
• AM — Activity Manager
• DNIC — Data Network Identification Code
• IAD — Integrated Access Device
• PTP — Point to Point Transmission Service (electricity)
• SCN — Switched Circuit Network
• VMS — Virtual Memory System
• SWAP — Shared Wireless Access Protocol
• JTF — Joint Task Force
• EIA — Extended Interaction Amplifier
• IAB — Internet Architecture Board
• FEC — Forward Error Correction
• FEP — Front End Processor
• WAIS — Wide Area Information Server
• SYM — Symmetric
• CODEC — Coder/decoder
• SL — Single Line
• LT — Less Than
• EULA — End User License Agreement (usually in reference to software)
• CAL — Calorie
• CAVE — Cellular Authentication and Voice Encryption Algorithm
• DPL — Digital Power Line
• SPD — Serial Presence Detect
• QDR — Quad Data Rate
• SMB — Server Message Block
• DC — Display Controller
• BIS — Business Information System
• LPD — Low Probability of Detection
• JDK — Java Development Kit
• PIC — Peripheral Interface Controller
• EST — Establish
• FLM — First Line Maintenance
• AN — Access Node
• TPC — The Phone Company
• RLU — Remote Line Unit
• AMPS — Advanced Mobile Phone Service (cellular phone standard)
• IRTF — Internet Research Task Force

• Q — Quadrature
• DMS — Data Management System
• SPA — Software Publishers Association
• RADIUS — Remote Authentication Dial-In User Service
• ISM — Industrial, Scientific and Medical
• E — Echo
• CAM — Content Addressable Memory
• SDP — Session Description Protocol
• TSR — Telecommunications Service Request
• LISP — List Processing Language
• MRT — Medical Response Team
• FTAM — File Transfer Access and Management
• FITL — Fiber-In-The-Loop
• AFOSR — Air Force Office Of Scientific Research(USA)
• L2TPV3 — Layer 2 Tunneling Protocol Version 3
• SPM — Scanning Probe Microscope
• CDC — Connected Device Configuration
• CGSA — Cellular Geographic Service Area
• SDP — Software Development Plan
• PS — Product Specification
• LAG — Link Aggregation Group
• BBM — Blackberry Messenger
• DEMUX — Demultiplexer
• HLR — Home Location Register
• DN — Distinguished Name
• PMP — Project Management Professional
• SF — Single Frequency
• LATA — Local Access and Transport Area
• UTP — unshielded twisted pair
• VRML — Virtual Reality Modeling Language
• TDD — Telecommunications Device for the Deaf
• PE — Probable Error
• HSCSD — High-Speed Circuit-Switched Data
• NES — Network Encryption System
• CIAC — Computer Incident Advisory Capability
• EBS — Electron Bombarded Silicon
• BS — Broadcast Satellite
• VBA — Visual BASIC for Applications
• DER — Distinguished Encoding Rules
• QI — Quality Indicator
• DTMF — Dual-Tone MultiFrequency
• OT — Office of Telecommunications
• RMI — Remote Method Invocation
• RPV — Remotely Piloted Vehicle
• EFIS — Electronic Flight Information System
• DUA — Directory User Agent
• FEP — Front-End Processor
• PP — Polypropylene
• FEXT — Far-End Cross Talk
• DL — Data Link

• VF — Voice Frequency
• SA — Source Address
• DCS — Data Collection System (NOAA Polar Orbiting Satellites)
• CQA — Certified Quality Auditor
• AUI — Attachment Unit Interface
• AIT — Automatic Identification Technology
• ASDE — Airport Surface Detection Equipment
• DVB — Digital Video Broadcasting
• WWAN — wireless wide-area network
• PM — Phase Modulation
• VOA — Voice Of America
• TOVS — TIROS Operational Vertical Sounder
• ER — Extended Range
• NAT — Network Address Translation
• ETSI — European Telecommunications Standard Institute
• BSS — Basic Service Set
• TTY — teletype terminal
• ASA — Acoustical Society of America
• VPI — Virtual Path Identifier
• SCCP — Signalling Connection Control Part
• NPA — Numbering Plan Area
• EIR — Equipment Identity Register
• SAI — Serving Area Interface
• TMSI — Temporary Mobile Subscriber Identity
• AC — Area Code
• TDD — Time Division Duplex
• 2W — 2-Wire
• ES — Emergency Service
• CVD — Chemical Vapor Deposition
• AS — Access System
• EMI — Electro-Magnetic Interference
• CRLF — Carriage-Return Line-Feed
• CS — Convergence Sublayer (ATM)
• DW — Deep Water
• BSID — Base Station Identity
• BCH — Bose-Chaudhuri-Hocquenghem Coding
• DM — Domain Model
• GSM — Groupe Speciale Mobile
• TCM — Trellis-Coded Modulation
• ESP — Encapsulating Security Payload
• DPDU — Data Protocol Data Unit
• ASN.1 — Abstract Syntax Notation One
• SIL — Solid Immersion Lens
• BSS — Base Station Subsystem
• CPC — Continous Packet Compression
• LDP — Label Distribution Protocol
• SNA — System Network Architecture
• PC — Peripheral Controller
• DSCP — Differentiated Services Code Point
• FDL — Facility Data Link

• RMS — Resource Management System
• UP — User Profile
• CODASYL — COnference on DAta SYstems Languages
• CSPDN — Circuit Switched Public Data Network
• TLK — Talk
• IMAP — Internet Mail Access Protocol
• CCIR — International Radio Consultative Committee (French Acronym)
• VT — Vacuum Tube
• NIU — Network Interface Unit
• DPSK — Differential Phase Shift Keying
• EU — End User
• DHD — Dial Home Device
• DISA — U.S. Defense Information Systems Agency
• BNC — Bayonet Neill-Concelman
• 1-ESS — x-ESS series of Electronic Switching Systems
• COAM — Customer Owned And Maintained
• T — Temperature
• BSI — British Standards Institution
• 4GL — Fourth-Generation Language
• AIF — Audio Interchange Format
• MDM — Mobile Device Management
• ADN — Abbreviated Dialing Number
• MIDP — Mobile Information Device Profile
• NDVI — Normalized Difference Vegetation Index
• RDI — Remote Defect Indicator (UNI Fault Management)
• WCDMA — Wideband Code Division Multiple Access
• EM — Electromigration
• SZ — Seizure
• POP — Post Office Protocol
• DDL — Digital Data Link
• LSI — Large Scale Integration -> VLSI
• DRFM — Digital Radio-Frequency Memory
• DNU — Do Not Use
• SB — Switchboard
• IPCP — Internet Protocol Control Protocol
• 1FB — Single line, Flat Business rate;
• IOC — Inter-Office Channel
• DII — Dynamic Invocation Interface
• GBPS — Gigabits per second
• TRMM — Tropical Rainfall Measuring Mission (US-Japan)
• FH — Frequency Hopping
• MFLOPS — Millions of Floating Point Operations per Second
• CB — Citizens' Band
• SISIR — Singapore Institute of Standards and Industrial Research
• CLETS — California Law Enforcement Telecommunication System
• CMOS — Complementary Metal Oxide Semiconductors
• C — Cost
• FMS — Fraud Management System
• ODS — Operational Data Store (knowledge management)
• ASYNC — Asynchronous

• PG — Page
• TC — Transmission Convergence (ATM)
• CP — Change Proposal
• SAS — Special Access Surcharge
• BMEWS — Ballistic Missile Early Warning System (bee-mews)
• NREN — National Research and Education Network
• IAT — Integrated Access Terminal
• FRS — Frame Relay Service
• FEM — Finite Element Method
• OWS — Operator Work Station
• NTU — Network Termination Unit
• ANSI-41 — ANSI standard for mobile management
• AF — Assured Forwarding
• TFTP — Trivial File Transfer Protocol (ATM)
• OSCAR — Orbiting Satellite Carrying Amateur Radio
• SS1 — Signalling System 1 (500/20 Hz tones)
• SMPTE — Society of Motion Picture and Television Engineers, Inc.
• BCDIC — Binary Coded Decimal Interchange Code
• LFACS — Loop Facility Assignment and Control System
• CVR — Crystal Video Receiver
• FRS — Family Radio Service
• FOSE — Federal Office Systems Exposition
• CCLC — Carrier Common Line Charge
• JAN — Joint Army-Navy
• FRAD — Frame Relay Access Device
• IT — Integration Test
• PDT — Portable Data Terminal
• KSU — Key Service Unit
• DOR — Detailed Outage Report
• STD — Subscriber Trunk Dialing
• SIL — Silence
• TTY — Text Teletype
• IEEE-CS — Institute of Electrical and Electronics Engineers Computer Society
• APDU — Application Protocol Data Units
• LOO — Likelihood of Occurrence
• DS-0 — Digital Signal, Level 0
• OOP — Object-Oriented Programming
• OSF — Open Software Foundation
• BS — Backing Store
• SMDS — Switched Multimegabit Data Service (ATM)
• OBC — Onboard Computer
• TIFF — Tag Image File Format
• IDF — Independent Distribution Frame
• PU — Physical Unit (IBM)
• IV&V — independent verification and validation
• PBT — Polybutylene Terephthalate
• GMRS — General Mobile Radio Service
• DUV — Deep Ultraviolet
• STN — Station
• DACS — Digital Access Cross-connect System

• RISC — Reduced Instruction Set Computing
• CIRC — Cross-Interleaved Reed-Solomon Code
• SMR — Specialized Mobile Radio
• SIM — Subscriber Identity Module
• E — Electra
• TOP — technical/office protocol
• CONUS — Contiguous United States
• GBT — Ground Based Tower
• NE — Network Element
• DM — Differential Mode
• 4 GIG — 4 Giga Intellectual Gadget
• CGA — Carrier Group Alarm
• BSS — Base Station System
• SG — Signaling Gateway (IETF)
• ACSE — Association Control Service Element
• XPS — X-Ray Photoelectron Spectroscopy
• SFX — Special Effects
• NA — Network Adapter
• DFE — Design For Environment
• TELNET — Telecommunications Network Protocol
• BLER — Block Error Rate
• TAD — Telephone Answering Device
• ASE — Application Service Element
• RACH — Random Access Channel
• FDTD — Finite Difference Time Domain
• IPS — InPlane Switching
• RSS — Radio Service Software (Motorola)
• PCI — Personal Computer Interface
• W-CDMA — Wideband Code Division Multiple Access
• DISN — Defense Information Systems Network
• EBCDIC — Extended Binary-Coded Decimal Interchange Code
• ROW — Rest Of World
• RJE — Remote Job Entry
• VLAN — Virtual Local Area Network
• OSP — Outside Plant
• DTN — Data Transfer Network
• MLM — Multi-Longitudinal Mode
• DDD — Direct Distance Dialing
• IEC — Interexchange Carrier
• IRC — International Record Carrier
• DMI — Distributed Management Interface
• CIS — Computer and Information Science
• FTNS — Fixed Telecommunications Network Services
• TSE — Toronto Stock Exchange
• DL — Definition List
• SDHLR — Super-Distributed Home Location Register
• RECON — Reconnaissance
• PVC — Permanent Virtual Connection
• ACC — Area Control Center
• MV — Motion Vector

• NAK — Negative Acknowledge
• TRS — Trunked Radio Systems
• ADC — Administration Center
• CAP — Capability
• OTDOA — Observed Time Difference of Arrival
• NAS — Network-Attached Storage
• TAM — Telephone Answering Machine
• CMIP — Common Management Information Protocol (ATM)
• TRS — Telecommunications Relay Service
• SQ — Service Quality
• SAF — System Access Fee
• TMS — Time Management System
• 4G — Fourth Generation Wireless Systems
• ADC — Access Deficit Charge
• DAP — Distributed Array Processor
• SFN — Single Frequency Network
• MAI — Multiple Access Interference
• SWBD — Switchboard
• RDS — Rate Determining Step
• IPOATM — Internet Protocol over ATM
• 2G — Second Generation Wireless Systems
• PSS — Performance Support System
• MSW — Most Significant Word
• RCC — Radio Common Carrier
• TSB — Telecommunication Standardization Bureau
• RGN — Region
• IPLC — International Private Leased Circuit
• LASA — Large Aperture Seismic Array
• SDSL — Symmetric Digital Subscriber Line
• VHSIC — Very High-Speed Integrated Circuit
• ALT — Accelerated Life Test
• SVC — Switched Virtual Circuit (ATM)
• BMS — Business Management System
• SDU — Signal Distribution Unit
• GDK — GIMP (GNU Image Manipulation Program) Drawing Kit
• ACE — Adaptive Communication Environment
• FTTC — Fiber To The Curb光纤到路边
• NWK — Network
• HTML — Hyper-Text Markup Language
• CCA — Carrier-Controlled Approach
• ACP — Access Control Point
• VQV — Voice Quality Value
• TTL — ToS and Time-to-Live
• HFC — Hybrid Fiber/Coaxial network
• MTS — Message Transfer System
• CHTML — Compact Hypertext Markup Language
• IPM — Inches Per Minute
• SRR — Search and Rescue Region
• SCCP — Signaling Connection Control Point
• FAS — Frame Alignment Signal

• NII — National Information Infrastructure (USA)
• IRF — Impulse Response Function
• CAC — Connection Admission Control (Asynchronous Transfer Mode)
• ESCA — photoelectron spectroscopy for chemical analysis
• DTU — Data Transfer Unit
• LD — Laser Diode
• CSC — Common Signaling Channel
• OSS — Operations Support System
• S/D — Source/Drain
• ETF — Early Termination Fee
• ST — Such That
• O/S — Operating System
• CLEC — Competitive Local Exchange Carrier
• SETI — Search for Extraterrestrial Intelligence
• C — Collector
• RSS — root-sum-square
• LRC — Longitudinal Redundancy Check
• CLDC — Connected Limited Device Configuration
• CGA — Color Graphics Adapter
• CNG — comfort noise generation
• BHCA — Busy Hour Call Attempts
• VPA — Valid Peripheral Address
• AP — Action Point
• ASAR — Advanced Synthetic Aperture Radar 
• ACF — Advanced Communications Function (IBM)
• SIA — Securities Industry Association
• RADINT — Radar Intelligence
• CS — Central Station
• SM — Service Module
• CBWFQ — Class Based Weighted Fair Queueing
• SPX — Sequenced Packet Exchange
• UMA — Unlicensed Mobile Access
• LSW — Least Significant Word
• EMR — Electromechanical Relay
• EA — Extended Address Field Bit
• SIMT — Système interbancaire marocain de télécompensation
• SPIN — Service Provider Identification Number
• DDU — Disk Drive Unit
• TSO — Telecommunications Service Order
• CS-PDU — Convergence Sublayer - Protocol Data Unit
• SLIC — Subscriber Line Interface Circuit
• DFG — difference-frequency generation
• 3-D — 3-Dimensional
• FECN — Forward Explicit Congestion Notification (ATM)
• EIR — Excess Information Rate
• SLV — Satellite-Launch Vehicle
• DPCM — differential pulse code modulation
• ARSR — Air Route Surveillance Radar
• BA — Behaviour Aggregate
• RDMA — Remote Direct Memory Access

• MTD — Moving Target Detection
• PIC — Programmable Interrupt Controller
• WAYP — White and Yellow Pages
• DGPT — Directorate General of Posts and Telecommunications
• WTP — Wireless Transaction Protocol
• ANC — Access Network Controller
• DARTS — Design Approach for Real-Time Systems
• REA — Rural Electrification Administration (US)
• CAM — Common Access Method
• # — Number sign, octothorp; special function key
• CLK — Clock
• FGA — Feature Group A
• PAM — Payload Assist Module
• VTS — Vessel Traffic Service
• OXCO — Oven-Controlled Crystal Oscillator
• CPC — Calling Party Control
• CP — Call Processing
• ISG — Information Systems Group
• CALEA — Communications Assistance for Law Enforcement Act
• CT — Computer Terminal
• HUP — Hook-UP
• KSPS — KiloSymbols Per Second
• EVA — Electronic Video Agent
• ALB — Analog Loopback
• EGSM — Extended Global System for Mobile Communications
• IPS — Instructions Per Second
• 3G — 3rd Generation Wireless Format
• OOK — On/Off Keying
• CSU — Channel Service Unit
• MSI — Maritime Safety Information
• WDA — Wireless Digital Assistant
• TOMS — Total Ozone Mapping Spectrometer (satellite Instrument)
• NTE — Network Terminating Equipment
• LDN — Local Directory Number
• SSRC — Synchronization Source
• DSI — Digital Speech Interpolation
• UART — Universal Asynchronous Receiver/Transmitter
• FEA — Finite Element Analysis
• CGI — Computer Graphics Interface
• YA — Yet Another
• LIS — Lightning Imaging Sensor
• CE — Channel Element
• WDN — Wireless Developer Network
• MMC — Microsoft Management Console (Microsoft)
• CIP — Carrier Identification Parameter
• FGD — Feature Group D
• DTI — Digital Trunk Interface
• SNIX — Single Noise Interference Xterminator
• VESA — Video Electronics Standards Association
• CCITT — Comit? Consultatif International T?l?graphique et T?l?phonique

• EECM — End-to-End Call Manager
• FSK — Frequency Shift Keying
• ILEC — Incumbent Local Exchange Carrier
• COM — Comedy Central
• MSC — Mobile Switching Center
• MHO — My Humble Opinion
• CCR — Customer Controlled Reconfiguration (Sprint)
• HSPA — High Speed Packet Access
• MMB — Middle Mouse Button
• COO — Cell of Origin
• AMA — automatic message accounting
• AWT — Agence Wallonne des Télécommunications
• WSDL — Web Services Description Language
• DLCI — data link connection identifier
• SSM — Synchronization Status Message
• CCNA — Cisco Certified Network Administrator
• WSFL — Web Services Flow Language
• ELFEXT — Equal-Level Far-End Cross-Talk
• RICK — Repeater Interface Communications Kit
• DCA — Dynamic Channel Assignment
• ATS — Air Traffic Services
• LCR — Least Cost Routing
• SD — Speed Dial
• L2F — Layer 2 Forwarding protocol
• RM-ODP — Reference Model for Open Distributed Processing
• IS 41 — Interim Standard 41 (Inter-Cellular Network Communication Protocol)
• CGI — Cell Global Identity
• LP — Line Pair
• SR — Slow Release
• V — Variable
• NCC — Network Control Center (GSFC)
• CNG — Fax Calling Tone
• ABM — Asynchronous Balanced Mode
• BAN — Building Area Network
• SRM — Scalable Reliable Multicast
• CES — Circuit Emulation Service
• AVR — Automated Voice Response
• INE — Intelligent Network Element
• PSN — Packet Switched Network
• CMRS — Commercial Mobile Radio Service
• ASD — Alternative Service Delivery
• SCPC — single channel per carrier
• VG — Voice Grade
• IG — Interface Group
• FDD — Frequency Division Duplex
• BAN — Billing Account Number
• TD-CDMA — Time Division - Code Division Multiple Access
• CPG — Converged Packet Gateway
• CIP — Continuous Improvement Program
• SCO — Synchronous Connection Oriented

• RX — Receive
• SINAD — SIgnal-to-(Noise And Distortion) ratio
• IMP — Interface Message Processor
• NCAR — National Center for Atmospheric Research (US)
• TDRSS — Tracking and Data Relay Satellite System
• SN — Service Number
• DNC — Do Not Call
• DAS — Data Acquisition System
• BOSS — Binary Object Storage System
• DXC — Digital Cross Connect
• DLU — Digital Line Unit
• RNX — Restricted Numeric eXchange
• IWF — Interworking Function
• AAS — advanced automation system (FAA)
• DLP — Data Link Processor
• SSM — Spread Spectrum Modulation
• CRB — Cramer-Rao Bound
• BY — Busy
• IPR — Intellectual Property Right
• RAU — Remote Access Unit
• CTI — Computer Telephony Integration
• LUNT — Line Unit Network Termination
• BATM — Basic Telecommunication Access Method
• EDFA — Erbium-Doped Fiber Amplifier
• F — Frequency
• MH — Message Handler
• CND — Calling Number Display
• NDS — Novell Directory Services
• SSMA — Spread-Spectrum Multiple Access
• DDLD — Direct Dial Long Distance
• COT — Central Office Terminal
• SIP — Session Initiation Protocol
• SCU — System Control Unit
• SN — Stock Number
• WNMS — Wireless Network Management System
• ZCZ — Zero Correlation Zone
• M/W — MicroWave
• LIF — Logical Interchange Format
• TAX — Trunk Automatic Exchange
• P — Priority
• BDSL — Broadband Digital Subscriber Line
• ECM — Error Correction Model
• CAM — Computer-Aided Manufacturing
• BDE — Borland Database Engine
• ESPN — Entertainment and Sports Programming Network
• LOP-P — Loss Of Pointer - Path
• CV — Coding Violation
• TACACS — Terminal Access Controller Access Control System
• CEPT — Conférence Européenne des Administrations des Postes et des Télécommunications
• DIV — Divisionsion

• TUR — Trunk Utilization Report
• DAC — Digital-To-Analog Converter
• DLL — Digital Local Line
• WE — Western Electric
• TSP — Telecommunications Service Priority
• LIM — Line Isolation Monitor
• WTS — Wireless Telecommunications Symposium
• SCM — Single-Carrier Modulation
• GTP — GPRS (General Packet Radio Service) Tunneling Protocol
• EBIC — Electron Beam Induced Current
• PLL — Phase Locked Loop
• FOD — Fax on Demand
• NTDS — Naval Tactical Data System
• FLL — Fixed-Loss Loop
• DC — Device Control
• BUS — Broadcast and Unknown Server
• FXS — Foreign Exchange Subscriber
• OML — Object Model Library
• LAAS — Local Area Augmentation System
• ARM — Asynchronous Response Mode
• NEMP — Nuclear Electromagnetic Pulse
• TDWR — Terminal Doppler Weather Radar
• ASN.1 — Abstract Syntax Notation 1
• ERL — Echo Return Loss
• EDSX — Electronic Digital Signal Cross-Connect
• DICOM — Digital Imaging and Communications in Medicine
• ADCCP — Advanced Data Communication Control Procedures
• LANE — Local Area Network Emulation
• RDBMS — Relational Data Base Management System (Oracle)
• SE — Southeast
• DMT — Discrete Multi-Tone Technology
• MITI — Ministry of International Trade and Industry
• MA — Maintenance Action
• WSP — Wireless Service Provider
• MGC — Multimedia Gateway Controller
• ETOC — Electronic Table of Contents
• PTI — Payload Type Indicator
• RTC — Real-Time Control
• SAT — Satellite
• DOCSIS — Data over Cable Service Interface Specification
• RXQUAL — Received Signal Quality
• MLA — Modern Language Association
• DA — deca
• * — Star, special function key
• MEAS — Measure
• CIP — Channel Interface Processor
• DBRNC — deciBel Relative to Noise in a Circuit
• RSL — Restricted Service License
• VSAM — Virtual Storage Access Method
• FDI — Feeder Distribution Interface

• SIM — Subscriber Identification Module
• PMT — Program Management Team
• PARC — Palo Alto Research Center
• PDL — Positioning Data Link
• DCF — Distributed Coordination Function
• VLSI — Very Large-Scale Integration
• PTP — Point To point Protocol
• CPE — Customer Premise Equipment
• PTO — U.S. Patent And Trademark Office
• CPOP — Circuit Precedence Over Packet data
• ADPCM — Adaptive Differential Pulse Code Modulation
• VPX — Virtual Path Cross-Connect
• SCCS — Switching Control Center System
• UAT — Universal Access Transceiver
• L2TP — Layer 2 Tunneling Protocol
• CTIA — Cellular Telecommunications Industry Association
• DDI — Direct Dialing Incoming
• ACA — Adaptive Channel Allocation
• ALI — Automatic Location Information
• SPE — Synchronous Payload Envelope
• NF — Noise Factor
• PUC — Public Utility Commission (electricity)
• TCP/IP — Transmission Control/Internet Protocol
• CSIRO — Commonwealth Scientific and Industrial Research Organization
• STM — Synchronous Transfer Mode
• BSC — Bi-Synchronous Communications
• ETN — Electronic Tandem Network
• WARC — World Administrative Radio Conference
• MSDP — Multicast Source Discovery Protocol
• SM OFC — Single-Mode Optical Fiber Cable
• BSA — Basic Service Area
• BUFR — Binary Universal Form for the Representation (of data)
• NCP — Network Control Program
• VN — Virtual Network
• LBR — Low Bit Rate
• URN — Uniform Resource Namespace
• GI — Graded-Index
• SA — Selective Availability (on GPS transmissions)
• TEI — Terminal Endpoint Identifier
• ILETS — International Law Enforcement Telecommunications Seminar
• LRQ — Location Request
• CAR — committed access rate
• AAL5 — ATM (Asynchronous Transmission Mode) Adaptation Layer 5
• SSAP — Source Service Access Point
• NRP — Network Resource Planning
• EDC — Electronic Dispersion Compensator
• FNN — Full National Number
• HW — Hardware Wars
• CIC — Carrier Identification Code
• MTA — Message Transfer Agents (Internet)

• CDM — Conceptual Data Model
• HFC — Hybrid Fiber Coaxial
• CLCC — Ceramic Leaded Chip Carrier
• FCA — Fixed Channel Allocation
• RMON — Remote Monitoring
• PSO — Professional Services Organization
• TLT — Test Loop Translator
• CPH — Call Party Handling
• CRV — Call Reference Value
• GTB — Global Telecom Brokers
• FOIP — Fax Over Internet Protocol
• MPI — Minimum Picture Interval
• B-CPE — Broadband Customer Premises Equipment
• AOS — Alternate Operator Service
• NW — North West
• MC — Maintenance Control
• TM — Thematic Mapper (Landsat)
• 3G — Third Generation (mobile communication system)
• DLT — Delete
• TOC — Telecommunication Operations Center
• NCF — Network Control Facility
• CDV — Cell Delay Variation(ATM)
• MAG — Mobile Access Gateway
• ET — Electronic Transmission
• B8ZS — Binary Eight Zero Substitution
• WFA — Wait for Answer
• CFR-47 — Code of Federal Regulations Title 47 (FCC)
• VPWS — Virtual Private Wire Service
• BORSCHT — Battery feed, Overvoltage protection, Ringing, Signaling, Coding, Hybrid, and Testing
• TDR — Time-Domain Reflectometry
• ETOM — Enhanced Telecom Operations Map
• BIND — Berkeley Internet Name Domain
• CAMEL — Customized Applications for Mobile-network Enhanced Logic
• PNP — Plug-and-Play
• AWG — arrayed waveguide grating
• AQP — Association for Quality and Participation
• INTELSAT — International Telecommunications Satellite
• MMM — Mobile Media Mode
• F/W — Firmware
• ESN — Electronic Serial Number
• FAC — Forced Authorization Code
• DTAP — Direct Transfer Application Process
• ISI — Intersymbol Interference
• STU — Secure Telephone Unit
• CAAS — Communications-as-a-Service
• REPT — Report
• DPT — Dynamic Packet Transport
• TACSAT — Tactical Satellite
• RLS — Recursive Least Squares
• CRTS — Cellular Radio Telecommunications Service

• 4WA — Four Wire Analog
• STMR — Sidetone Masking Rating (telecommunications)
• ICL — Inserted Connection Loss
• MA — Message Analysis
• MBE — Molecular Beam Epitaxy
• RADIUS — Remote Authentication dial In User Service
• SCR — Sustainable Cell Rate
• COMB — Combined
• MDN — Mobile Directory Number
• PMOS — P-channel Metal Oxide Semiconductor
• ULL — Unbundled Local Loop
• UTL — Utility
• PNP — Positive-Negative-Positive
• EMF — Event Management Framework
• VCI — Virtual Channel Identifier
• GRX — GPRS Roaming Exchange
• GRUB — Greedy Reclamation of Unused Bandwidth
• STD — Secondary Telecom District
• 2G — Second generation cellular
• PTT — Push to Talk Technology
• UBR — Unspecified Bit Rate
• NSAP — Network Service Access Point
• DEM — Digital Elevation Model
• FTTK — Fibre To The Kerb
• ILD — International Long Distance
• INMS — Integrated Network Management System
• FFH — Fast Frequency Hopping
• 3G HSPA — Third-Generation High-Speed Packet Access
• PIM — Protocol Independent Multicast
• ENV — Environment
• FIRST — Forum of Incident Response and Security Teams (CERT)
• E2E — End-to-End
• FCA — Free Carrier Alongside
• MTI — Moving Target Indicator
• ALOC — Average Length Of Call
• MAP — Mobile Application Part
• ATSC — Advanced Television Systems Committee
• 100VG — 100 Voice Grade (IEEE 802.12 AnyLAN Standard)
• GERAN — GSM (Global System for Mobile communications) Edge Radio Access Network
• DQDB — Distributed Queue Dual Bus
• DMS — Defense Messaging System
• DXF — Data Exchange Format
• JISC — Japanese Industrial Standards Committee
• CMA — Communications Management Association
• NAU — Network Addressable Unit
• BIS — Brought Into Service
• LS — Loop Start
• DTE — Digital Terminal Equipment
• GAN — Global Area Network
• FEBE — Far End Block Error (SONET)

• CCCH — Common Control Channel
• FC — Frame Control
• MP — Modulation Parameter
• UPT — Universal Personal Telecommunications
• MR — Mobile Router
• PTT — Push to Talk Taster
• FTTP — Fiber To The Premises
• IDCP — Internet Device Control Protocol
• EPP — Enhanced Parallel Port (PC)
• IBSS — Independent Basic Service Set
• RCU — Radio Control Unit
• CSAR — Combat Search and Rescue
• LH — Link Handler
• BB — Blackberry
• ARFA — Allied Radio Frequency Agency
• CACH — Call Appearance Call Handling
• WIS — WAN (Wide Area Network) Interface Sublayer
• VSAT — Very Small-Aperture Terminal
• MF — Multiple Frequency
• DCAS — Downloadable Conditional Access System
• ATRAC — Adaptive Transform Acoustic Coding
• VTAM — Virtual Telecommunication Access Method
• ATS — Abstract Test Suite
• NSE — Network Software Environment
• 3GIP — Third Generation Internet Protocol
• PD — Pulse Duration
• CAPTAIN — Character And Pattern Telephone Access Information Network
• MTP — Message Transfer Part
• 3GPP — Third-Generation Partnership Project
• DPNSS — Digital Private Network Signaling System
• NDIS — Network Driver Interface Specification (Microsoft Windows NT)
• UMTS — Universal Mobile Telecommunication System
• CERN — Conseil Europeen Pour La Recherche Nucleaire
• BABT — British Approvals Board for Telecommunications
• ATCA — Advanced Telecom Computing Architecture
• FTS — Federal Telecommunications System
• BOM — Bit-Oriented Message
• ARPT — Autorité de Régulation des Postes et Télécommunications
• PTT — Push to Talk Testing
• GTM — Go to Meeting
• STM — Scanning Tunneling Microscopy
• ETSI — European Telecommunications Standards Institute
• WTNM — Working Telephone Number Management
• ADM — Administration Building
• PTM — Packet Transport Mode
• SRA — Seamless Rate Adaptation
• TRIG — Trigger
• ARCNET — Attached Resource Computer Network
• SCR — System Change Request
• PLCP — Physical Layer Convergence Procedure

• RFR — Radio Frequency Radiation
• IR — International Roaming
• RTB — Retransmission Buffer
• NTSC — National Television Standards Committee
• BAF — Bellcore AMA (Automatic Message Accounting) Format
• FDOA — Frequency Difference Of Arrival
• ECS — Environmental Control System (Subsystem)
• INSAT — Indian National Satellite
• SPID — Service Profile Identifier
• DL — Downlink Message
• RCP — Right-Hand Circular Polarization
• LN — Line
• SRL — Singing Return Loss
• TD — Transmit Data
• BT — Burst Tolerance
• PACS — Personal Access Communications System
• RDT — Recall Dial Tone
• BT — Bluetooth Tablet
• CTE — Computer Telephony Engineer
• DPA — Distributed-Power Architecture
• PY — person-year
• BPP — Billed Party Preference
• CON — Concentrator
• DRQ — Disengage Request
• ECTF — Enterprise Computer Telephony Forum
• LDI — Long Distance Interconnect
• EST — Electroshock Therapy
• LORAN — Long Range Aid to Navigation System
• DPBX — Digital Private Branch Exchange
• MFC — Multi-Frequency Code
• MC/MIC — Mode Common/Mode Indicate Common
• BCSM — Basic Call State Model
• CASE — Computer-Aided Software Engineering
• FAW — Frame Alignment Word
• RSN — Regional Service Network
• DOD — Direct Outward Dialing
• RIPE NCC — Reseaux IP Europeens Network Coordination Centre
• SLIP — Serial Line Internet Protocol
• BAP — Bandwidth Allocation Protocol
• EC — Equipment Controller
• DNSIX — Defense Network Security Information Exchange
• FIOS — Fiber Optic Services
• TSG — Telephone Security Group
• JWP — Joint Working Party
• WVOIP — Wireless Voice over Internet Protocol
• PTE — Path Terminating Equipment (SONET)
• WSA — Wireless Security Auditor
• DPDT — Double-Pole Double-Throw
• ET — Exchange Terminal
• IPRC — Intellectual Property Rights Committee

• TCB — Telecommunication Certification Body
• RDT — Remote Digital Terminal
• SSN — Switched Service Network
• NT — New Technology, also Windows NT
• CDA — Communications Decency Act's
• FPS — Framing Pattern Sequence
• ESCON — Enterprise System Connection
• ADPC — Automatic Data Processing Center
• DSSSL — Document Style Semantics and Specification Language
• MAU — Multistation Access Unit
• OSA — Open System Architecture
• AFI — Authority and Format Identifier
• COC — Central Office Connection
• DE — Discard Eligibility (ATM)
• LAPB — Link Access Protocol-Balanced
• CRBT — Color Ring Back Tone
• EFCI — Explicit Forward Congestion Indication (ATM)
• CBQ — Class-Based Queuing
• MIS — Marketing Intelligence System
• CDDI — Copper Distributed Data Interface
• MMDS — Multichannel Multipoint Distribution Service
• RADSL — Rate Adaptive Digital Subscriber Line
• EM — Element Manager
• SYSADM — System Administrator
• DTL — Defense Telephone Link
• SN — Switching Network
• FRF-LMI — Frame Relay Forum - Local Management Interface
• CID — Craft Interface Device
• MNP — Mobile Number Portability
• WFT — Wireline Formation Test
• ATTRA — Appropriate Technology Transfer for Rural Areas
• ATU-C — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Central office end
• LSAP — Link Service Access Point
• NLM — NetWare Loadable Module
• MPU — Main Processor Unit
• COFA — Change Of Frame Alignment
• DXI — Data Exchange Interface
• QOI — Quality of Information
• OODBMS — Object-Oriented Database Management Systems
• OMP — Open Management Platform
• AGCH — Access Grant Channel
• S/N — Signal-to-Noise ratio
• CFOT — Certified Fiber-Optic Technician
• TU — Transmission Unit
• FMR — Follow Me Roaming
• VISSR — visible and infrared spin scan radiometer (GOES)
• ACU — Automatic Calling Unit
• ATB — Above-Ground Telecommunications Backbone
• 3GSM — Third-generation Global System for Mobile (communications)
• SDNS — Secure Data Network System

• VAN — Value-Added Network
• TT — Text-Telephone
• LMDS — Local Multipoint Distribution Service
• CRS — Cell Relay Service
• VADB — Virtual Auto Dial Backup
• NMC — Network Management Center
• TDM — Time Division Multiplexing
• 4WAI — Four-Wire Analog Interface
• BNCC — Base Network Control Center
• UDP — Up Down Pair
• PSNEXT — Power Sum Near End Cross Talk
• WFG — Wireless Firewall Gateway
• SCH — Synchronization Channel
• N-AMPS — Narrowband Advanced Mobile Phone System
• TBPS — Terabits Per Second
• DUV — Data-Under-Voice
• FAT — Final Acceptance Testing
• NC — Network Channel
• ALI — Automatic Location Identifier
• LCF — Location Confirm
• RDSS — Radio Determination Satellite Service
• LCGN — Logical Channel Group Number
• MILNET — Military Network
• WIN — Wireless Intelligent Network
• LB — Local Battery
• CCP — Compression Control Protocol
• AECT — Association for Educational Communications and Technology's
• EEROM — Electronically Erasable Read-Only Memory
• BHCC — Busy Hour Call Completions
• RADARSAT — Radar Satellite
• DMT — Discrete Multi-Tone
• BWD — backward
• AAV — Alternate Access Vendor
• CDV — Compressed Digital Video
• TON — IEEE/ACM Transactions On Networking
• BHA — Busy Hour Attempts
• DECCO — DISA Defense Commercial Communications Office
• ALCAP — Access Link Control Application Protocol
• CPAP — Customer Premises Access Profile
• RPCU — Radio Port Control Unit
• SMS — Service Management System
• CALS — Computer Aided Acquisition and Logistic Support
• CSR — Customer Service Request
• NAP — Network Access Point
• HDTV — High-Definition Television
• PWM — Pulse width modulation
• AIS-L — Alarm Indication Signal - Line
• EV — electronvolt
• DAC — Digital to Analog Converter-Audio
• ANS — Advanced Network Services

• DMI — Desktop Management Interface (computing)
• FI — Format Identifier
• APPC — Advanced Program-to Program Communications
• CBMS — Computer-Based Message System
• QOTS — Quality Of Telephone Services
• DNI — Data Network Interface
• TCA — Threshold Crossing Alert
• DPST — Double-Pole Single-Throw
• SGSN — Serving GPRS (General Packet Radio Service) Support Node
• EVC — Electronic Voucher Charging
• USRT — Universal Synchronous Receiver/Transmitter
• RAD — Recorded Announcement Device
• CTO — Commonwealth Telecommunications Organisation
• DCS — Defense Communications System
• ACF — Access Coordination Function
• PSDN — Public Switched Digital Network
• PFE — Power Feed Equipment
• LLA — Link Level Access
• UMTS — Universal Mobile Telecommunications Service
• ANAC — An Automatic Number Announcement Circuit
• GFC — Generic Flow Control (ATM)
• RS-422 — Recommended Standard 422 (ANSI/EIA standard for transmitting serial data)
• AIU — Analog Interface Unit
• CSTA — Computer Supported Telecommunications Applications
• VNL — Via Net Loss
• TBCD — Telephony Binary Coded Decimal
• AMTFT — Active Matrix Thin Film Transistor
• LCU — Lightweight Computer Unit
• UNI — User-Network Interface
• EC-N — Electrical Carrier (n=a number, e.g., EC-4)
• EC — Entropy Coding
• IXC — interexchange carrier
• FIFO — first-in, first-out
• TP — Transition Point
• BAM — Basic Access Module
• GMSS — Global Mobile Satellite System
• BCS — British Computer Society
• TSC — Test System Controller
• PSN — Public Switched Network
• ARD — Automatic Ring Down
• CSR — Customer Service Report
• BIC — Bus Interface Controller
• LCP — Local Control Point
• LRM — Long Reach Multimode
• OMF — Object Management Framework
• PSLV — Polar Satellite Launch Vehicle (Indian Space Research Organization; India)
• DECT — Digital Enhanced Cordless Telecommunication
• GSTN — General Switched Telephone Network
• CAS — Column Address Strobe
• VSM — Vestigial Sideband Modulation

• MVDS — Microwave Video Distribution System
• NICT — National Institute of Information and Communications Technology
• OLS — Optical Line System
• SMT — station management (protocol)
• DUN — Dial-Up Networking
• X — X Window System
• FGDC — Federal Geographic Data Committee's
• PCS — Personal Communications Services
• TC — Technical Committee (HL7)
• VOB — Voice Over Broadband
• CDVT — Cell Delay Variation Tolerance
• ITU-T — International Telecommunication Union - Telecommunications section
• DDU — Digital Data Unit
• PTCL — Pakistan Telecommunication Company Ltd
• CCSA — Common Control Switching Arrangement
• KEK — Key Encrypting Key
• AB — Answer Back
• CCR — Current Cell Rate (ATMF)
• LEED — Low-energy Electron Diffraction
• LMT — Lightwave Microcell Transceiver
• USA — Underground Service Alert
• DTU — Date/Time Update
• LPDP — Local Policy Decision Point
• DMT — Digital-Discrete Multi-Tone
• MB — Measured Business
• CSDU — Core Service Data Unit
• SEM — Scanning Electron Microscopes
• OSD — Onscreen Display
• MBMS — Multimedia Broadcast/Multicast Service
• VO — Voice Only
• PMT — Photo Multiplier Tube
• COP — Character Oriented Protocol
• UCF — Unregistration Confirm
• LCAS — Link Capacity Adjustment Scheme
• FMS — Fixed Mobile Substitution
• FLN — Fixed Line Network
• NRZ — Nonreturn To Zero
• MGCP — Multimedia Gateway Control Protocol
• STA — Science and Technology Agency (Japan)
• BRAN — Broadband Radio Access Network
• SMMR — Scanning Multichannel Microwave Radiometer
• CLD — Cross-Layer Design
• GOMP — Get Off My Phone
• BPSK — Binary Phase-shift Keying
• DIL — Direct Inward Line
• P2P — Person-to-Person
• 802.11 HR — High data Rate IEEE 802.11 Wireless LAN protocol
• SSU — Synchronization Supply Unit
• BTP — Business Telecom Products, Inc.
• HEC — Header Error Control

• PLE — Path Length Efficiency
• FHSS — Frequency Hopping Spread Spectrum
• LSC — Link State Control
• RNR — Receive Not Ready
• KTS — Key Telephone System
• VOFR — Voice Over Frame Relay
• CATI — Computer-Assisted Telephone Interviewing
• CDA — Communications Decency Act of 1996
• LSP — Label Switched Path
• BTS — Base Transceiver Station (cellular)
• ATL — Advanced Technology Laboratory
• QS — Quasi-Synchronous
• VDR — Voice Digitization Rate
• IBS — In-Building Solutions
• CLP — Cell Loss Priority (ATM)
• BSC — Base Station Controller
• ACNA — Access Customer Name Abbreviation
• CP — Cell Phone
• TP — Telephone Pole
• BASIZE — Buffer Allocation Size
• RRC — Root Raised-Cosine
• GS — Ground Start
• IVP — Integrated Voice Protocol
• B-ISDN — Broadband ISDN
• SDSL — Symmetrical Digital Subscriber Line
• WAE — Wireless Application Environment
• TP-PMD — Twisted Pair Physical Medium Dependent
• LI — Length Indicator
• BSRF — Basic System Reference Frequency
• BAOC — Barring of All Outgoing Calls supplementary service
• BIOS — Basic Input-Output System
• PSQM — Perceptual Speech Quality Measure
• LOB — Line Of Bearing/Balance
• ATD — Advanced Technology Demonstration
• FOC — Fiber-Optic Cable
• SAR — Segmentation and Reassembly (ATM)
• TJB — Telephone Junction Box
• AARQ — A-Associate Request
• DCMES — Dublin Core Metadata Element Set
• IDLC — Integrated Digital Loop Carrier
• EC — Enhanced Cellular
• IMPI — IP (Internet Protocol) Multimedia Private Identity
• GOSIP — Government Open Systems Interconnection Profile
• WAAS — Wide Area Augmentation System
• LTU — Line Terminating Unit
• ESM — electronic support measure
• FR — Functional Requirement
• AAP — Alternate Access Provider
• ISSI — Inter-Switching System Interface
• A/D — Analog-to-Digital converter

• WIVO — WIreless VelOcity
• BT — Back Trace
• PJC — Pointer Justification Count
• PMMA — Polymethyl Methacrylate
• SGCP — Simple Gateway Control Protocol
• BP — Block Parity
• ANT — ADSL Network Terminator
• ADM — Administration, Office of
• LFTYR — Ley Federal de Telecomunicaciones y Radiodifusión
• TCM — Time Compression Multiplexer
• RTC — Right to Carry
• DMT — Discrete Multi-tone Transmission
• RLA — Received Level Average
• TCS — Telephony Control Specification
• CC — Composite Clock (SONET)
• COBE — Corporate Owned Business Only
• WRED — Weighted Random Early Detection
• TSI — time-slot interchange
• MEH — Mobile-Executed Handoff
• DCO — Dial Central Office
• XC — Cross-Connect
• EC — Echo Cancelling
• ADM 3X — DS3 Add-Drop Multiplex
• PHY — Physical Layer
• MCR — Minimum Cell Rate (ATM)
• NFR — Near-Field Recording
• AT — Attenuation
• PSK — Phase Shift Key
• ECS — Encryption Control Signal
• VAD — Voice Activity Detection
• SLIC — Subscriber Loop Interface Circuit
• CACM — Communications of the ACM
• PDSO — Packet Data Security Overlay
• USF — Universal Service Fund
• PCCA — Portable Computer Communications Association
• NESC — National Electrical Safety Code
• VC — Virtual Circuit (ATM)
• DF — Direction Finding or Finder
• CDPD — Cellular Digital Packet Data
• SCORM — Shareable Content Object Reference Model
• RS — Receive Signature
• CLOS — Clear Line Of Sight
• AIS-V — Alarm Indication Signal - Virtual
• GSM — Global System for Mobile telecommunications
• SMS — System Management Server
• DTR — Down-Time Ratio
• P&A — Privacy and Authentication
• IDCU — Integrated Digital Carrier Unit
• DSU — Digital Service Unit
• SQL — Specified Quality Level

• OIM — Operations Interface Module
• CALA — Customer Address Location Area
• CT — Cordless Telecommunications
• BWX — Broadband Wireless Exchange
• NAM — Number Assignment Module
• PROV — Provisioning
• ULP — Upper Layer Protocol
• UNO — Universal Network Operations
• CSCW — Computer-Supported Cooperative Work
• CCCI — Command, Control, Communications and Intelligence
• UIT — Union Internationale des Télécommunications
• ANSI — Advanced Network Signaling Input
• ADTM — Asynchronous Data Transfer Mode
• PT — Payload Type (ATM)
• LZ — Lempel-Ziv compression algorithm
• UTRAN — UMTS (Universal Mobile Telecommunication System) Terrestrial Radio Access Network
• LCU — Line Control Unit
• VSC — Vertical Service Code
• LSI — Large-Scale Integration
• RP — Radio Port
• SBX — Small Business Exchange
• PGP — Pretty Good Protection (encryption)
• TRX — Tandem Repeater eXchange
• DS-3 — Digital Signal, Level 3
• SAPI — Service Access Point Identifier
• AVT — Audio Visual Telecommunications
• LMS — Location and Monitoring Service
• ATU-R — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Remote terminal end
• DOD — Dial on Demand
• PLCP — Physical Layer Convergence Protocol (ATM)
• TCC — Transmission Control Code
• IPXCP — Internetwork Packet Exchange Control Protocol
• TCL — Transverse Conversion Loss
• TIMS — Telephone Information Management System
• DLE — Digital Local Exchange
• WDSL — Wireless Digital Subscriber Line
• Z — Zulu Time
• HU — Hook Up
• CNID — Calling Number Identification Display
• IMTS — Improved Mobile Telephone Service
• SR — Service Request
• FEAC — Far End Alarm and Control
• VOB — Versioned Object Base
• NSDI — National Spatial Data Infrastructure
• RCT — remote Control Terminal
• ACM — Address Complete Message
• 4G — Fourth Generation
• BOA — Basic Object Adapter
• DPT — Dial Pulse Terminate
• ZD — Zero Defects

• HPN — Home Phone Network
• MO — Magneto-optic
• SMSC — Short Message Service Center
• TMTC — Telemetry and Telecommand
• DCC — Digital Control Channel
• CFS — Call for Service
• VLF — Vertical-Laminar-Flow
• GLT — Great Lakes Telecom
• AEA — American Electronics Association's
• BDFB — Battery Distribution Feeder Bay
• JSC — Joint Scientific Committee (ICSU, WCRP, and WMO)
• LAT — Local Area Transport (network)
• AAV — Alternative Access Vendor
• SDN — Software Defined Network
• AFCEA — Armed Forces Communications and Electronics Association's
• BSS — Broadband Switching System
• ACRE — Authorization and Call Routing Equipment
• TSDU — Transport Service Data Unit
• WFA — Work Force Administration
• EKTS — Electronic Key Telephone Set
• AFPS — Automatic Facility Protection Switching
• NMC — Nortel Matra Cellular
• MBS — Maximum Burst Size (ATM)
• DNA — Digital Network Architecture
• ADIF — Accounting Data Interchange Format
• VFL — Visual Fault Locator
• VCT — Variable Cam Timing
• LIDB — Line Information DataBase
• UAN — Universal Area Network
• QPM — QoS (Quality of Service) Policy Manager
• VPC — Virtual Path Connection (ATM)
• GSM-R — Global System for Mobile (communications) – Rail
• CLI — Calling Line Identification
• BONDING — Bandwidth On Demand Interoperability Group
• MOS — Metal Oxide Semiconductor (FET Devices)
• AAL — ATM (Asynchronous Transmission Mode) Adaptive Layer
• BCIX — Berlin Commercial Internet Exchange
• CAN — Controller Area Network
• CDSL — Consumer Digital Subscriber Line
• DCEF — Distributed Cisco Express Forwarding
• CD-ROM — Compact Disk-Read-Only Memory
• MITS — Metaphors for Integrated Telecommunications Services
• PNM — Pulse Number Modulation
• NC — Network Computer (PC Internet)
• VCR — Videocassette Recorder
• DTW — Dynamic Time Warping
• XRF — X-Ray Fluorescence
• AMTI — Airborne Moving Target Indicator
• EF&I — Engineering, Furnishing and Installation
• RWIN — Receive Window

• TP — Termination Point
• PTT — Post Telegraph and Telecommunications
• NIMH — Nickel-Metal Hydride
• SAMI — Structured Adjustment & Maintenance Interface
• NANP — North American Numbering Plan
• CEE — Communaut? Economique Europ?enne
• ACL — Asynchronous Connection-less Link
• MIN — Mobile Identification Number
• PCIA — Personal Communications Industry Association
• SCC — Specialized Common Carrier
• FD — Full Duplex
• TNI — Telephone Network Interface
• CAE — Common Application Environment
• ACMA — Atlantic Cable Maintenance Agreement
• TPS — Telephone Preference Service
• HDB3 — High-Density Bipolar Three-bit substitution
• TACSIM — Tactical Simulation (Simulator)
• NPSI — Network Packet Switching Interface
• EA — expedited acknowledgement
• AI — Adapter Interface
• LXT — Local Exchange Terminal
• DMNG — Digital Mobile News Gathering
• DSCS — Defense Satellite Communication System
• OST — Office of Science and Technology
• TRCSL — Telecommunications Regulatory Commission of Sri Lanka
• LTU — Line Termination Unit
• A/C — Air Conditioner
• TCAM — Telecommunications Access Method
• IOC — Interoffice Channel
• CMTS — Cellular Mobile Telephone System
• TTC — Telemetry Telecommand and Control
• CM — Common Mode
• CLF — Carrier Line Failure
• CWTS — China Wireless Telecommunication Standard
• NSN — National Significant Number
• CDM — Configuration Data Manager
• MQFP — Metric Quad Flat Pack
• IVN — Interactive Video Network
• BTN — Billing Telephone Number
• PVN — Private Virtual Network
• MERIS — medium-resolution imaging spectrometer
• FB — Fine Business
• AAL2 — ATM (Asynchronous Transmission Mode) Adaptation Layer 2
• FUD — Fair Use Doctrine
• SSP — Security Service Provider
• O — objective
• FESS — Flywheel Energy Storage System
• E — Exchange
• DLT — Digital Line Termination
• CLASS — Cell Level ATM (Asynchronous Transfer Mode) Services Simulator

• DNA — Do Not Answer
• DE — Discard Eligible
• LRF — Laser Range Finder
• DDM — Data Distribution Manager
• JMA — Japanese Meteorological Agency
• WEDE — Wireless Enterprise Delivery Environment
• NETBIOS — Network Basic Input-Output System
• NICAD — Nickel Cadmium
• APPN — Advanced Peer-to-Peer Network
• LULT — Line Unit/Line Termination
• SINS — Ship’s Inertial Navigation System
• ESA — Enhanced Subscriber Authentication
• CIS — Center for Integrated Systems
• RTFM — Read The Friendly Manual
• ASAS — All-Source Analysis System
• VR — Virtual Router
• AEIMP — Apple Event Interprocess Messaging Protocol
• AMOLED — Active Matrix Organic Light-Emitting Diode
• DACS — Digital Access Carrier System
• ESG — Enhanced Service Gateway
• RSL — Remote Serial Link
• DDSN — Digital Derived Services Network
• PRI — Priority
• CD ROM — Compact Disc Read-Only Memory
• LVM — Line Verification Module
• DAF — Directory Access Function
• WNAP — Wireless Network Access Point
• DAS — Distributed Antenna System
• YIP — Your Internet Phone
• VNS — Virtual Network System
• SHR — Self-Healing Ring
• RLC — Radio Link Control
• UDT — Unreliable Data Transfer
• USPI — Universal Serial Phone Interface
• SS7 — Signaling System 7
• SDCCH — Standalone Dedicated Control Channel
• ATB — All Trunks Busy
• TLP — Transmission Level Point
• DEO — Digital End Office
• ADTS — Ameritech Digital Transport Service
• HCV — High Capacity Voice
• MDCP — Media Device Control Protocol
• CVT — Circuit Validation Test
• SACS — Security Access Control System
• ECC — Emergency Communications Center
• VLR — Visitor Location Register
• EMV — EuroPay, MasterCard, Visa
• OTF — On-The-Fly (data acquisition method)
• JDC — Japan Digital Cellular
• DS-1 — Digital Signal, Level 1

• CD — Committee Draft
• DOV — Data-Over-Voice
• DORA — EV-DO (EVolution-Data Optimized) standard Revision A
• DACS — Digital Access and Cross-Connect System
• LASINT — Laser Intelligence
• UNI — User Network Interface
• ATIS — Automatic Transmitter Identification System
• UCM — Use Case Map
• DORK — Disciples Of The Righteous King
• VCC — Voice Call Continuity
• TFL — Telecom Fiji Limited
• CM — Connection Manager
• IPCDN — IP over Cable Data Networks
• LRB — Loop Reverse Battery
• FDMMA — Frequency Division Multiplexing Multiple Access
• VDSL — VHBR (Very High Bit Rate) Digital Subscriber Line
• BUS — Business Units
• ECDIS — Electronic Chart Display Information System
• IR — Information Request
• COI — Community of Interest
• QPA — Quality Performance Analysis
• IMT-2000 — International Mobile Telecommunications 2000
• NCOS — Network Class Of Service
• MNOS — Metal-nitride-oxide Semiconductor
• SSU — Stratospheric Sounding Unit (TOVS)
• IMT-A — International Mobile Telecommunications - Advanced
• HUMAN — High-speed Unlicensed Metropolitan Area Network
• RYP — Russian Yellow Pages
• DOITT — Department of Information Technology and Telecommunications
• D3 — Digital channel bank, Third generation
• CPN — Customer Premise Network
• CCSS6 — Common Channel Signaling System # 6
• ESDS — Electrostatic Discharge Sensitive
• SCMG — SCCP Management
• LSMS — Local Service Management System
• SHD — Smart Handheld Device
• AL — Alignment
• HUACA — Hang Up And Call Again
• FPLMTS — Future Public Land Mobile Telecommunications System
• CCH — Common Channel Handler
• CAL — Customer Access Line
• OID — Object Interaction Diagram
• CMAS — Cellular Management System
• CELP — Code Excited Linear Prediction
• CAP — Competitive Access Provider
• ISD — International Subscriber Dialling
• MRCA — Most Recent Common Ancestor
• SMU — Service Management Unit
• SNI — Service Node Interface
• MODEM — modulation and demodulation

• AA — Auto-Answer
• RCMAC — Recent Change Memory Administration Center
• DBN — Dial-Back Number
• MMS — Multimedia Message Service
• ARS — Automatic Route Selection
• RBS — Robbed Bit Signaling
• EGPRS — Enhanced General Packet Radio Service
• USF — Universal Server Farm
• CSL — component sublayer
• MLHG — Multi-Line Hunt Group
• NMS — NetWare Management System
• BFS — Broadcast File System
• MSG — Management Steering Group
• HSCSWD — High-Speed Circuit-SWitched Data
• ITFS — International Toll Free Services
• AIS-P — Alarm Indication Signal - Path
• WBMP — Wireless Bitmap
• GOSIP — Government Open System Interconnection Profile
• TWX — Teletypewriter Exchange (Telex)
• SCE — Service Creation Environment
• BTL — Bell Telephone Laboratories, Inc.
• AAS — Automatic Announcement Subsystem
• WPBX — Wireless Private Branch Exchange
• GOS — Gerry Otis Simpson
• WATS — Wide Area Telecommunications Service
• PM — Processable Mode
• APS — Advanced Power System
• ISC — International Switching Center
• CSP — Converged Service Platform
• WDMW — Web Directory for Mobile and Wireless
• RCF — Remote Call Forwarding
• INAP — Intelligent Network Application Part
• SOR — Statement of Requirements
• MEECN — Minimum Essential Emergency Communication Network
• MAPDU — Management Application Protocol Data Unit
• INWATS — INward Wide Area Telecommunications Service
• MMJ — Modified Modular Jack
• DCP — Distributed Collaborative Planning
• WGX — Wireless Gateway Switch
• DBF — Digital Beam-Forming
• ALC — Automatic Line Controller
• MOC — Maintenance and Operations Console
• SR — Scanning Radiometer
• AH — Authentication Header
• VCA — Voice Connecting Arrangement
• RJ-11 — Registered Jack type 11 (4-wire connector)
• TDRS — Tracking and Data Relay Satellites
• RANAP — Radio Access Network Application Part
• TESMA — Telecommunications Equipment and Services Master Agreement
• SS6 — Signalling System 6

• DDS — Dataphone Digital Service (AT&T)
• CMT — Commercial Metering Transponder
• LQD — Line Quality Disturbance
• ISDP — Intelligent Shared Dual Path
• WLAP — Wireless LAN (Local Area Network) Access Point
• CEPT — Conference of European Posts and Telecommunications
• SH — Shell
• WDM — Windows Driver Model
• TEM — Transmission Electron Microscope
• SPI — Security Parameters Index
• PTN — Public Telephone Network
• C² — Command and Control
• ALT — Automatic Link Transfer
• DME — Distributed Management Environment (OSF)
• SNI — Subscriber Network Interface
• TASI — Time Assigned Speech Interpolation
• JWG — Joint Working Groupof
• VGF — Voice Grade Facility
• LDM — Limited Distance Modem
• ATMS — automatic transmission measuring system
• TRAC — Totally Reconfigurable Analog Circuit
• TCAP — Transaction Capabilities Application Part
• ATIS — Alliance for Telecommunications Industry Solutions
• AFRINIC — African Network Information Centre
• UMTS — Universal Mobile Telecommunications Standard
• MEI — Multiple Extension Interworking
• RTU — Right to Use
• QOD — Quality of Data
• NMC — Network Model Coverage
• EOI — End of Image
• WBTS — Wireless Business Telephone System
• BC — Basic Call
• RSN — Readable Serial Number
• TOMS — Telecom Operations Management System
• CCITT — Comite Consultatif International Telegraphique et Telephonique (now ITU-T)
• BSVCI — Broadcast Signaling Virtual Channel Identifier
• TP — Transaction Processor
• DLC — Digital Leased Circuit
• LQR — Line Quality Report
• WIPS — Wireless Intelligent Personal Server
• XWI — XML (extensible markup language) for Wireless Images
• SVI — Service Interception
• ATACS — Army Tactical Communications System
• WPC — Wireless Personal Communications
• FCFS — First-Come, First-Served
• SMLC — Serving Mobile Location Center
• QNC — Quick Net Connect
• ADC — Advanced Data Control
• MOD — Modulo
• CTIT — College of Telecommunications and Information Technology

• WDP — Wireless Datagram Protocol
• BREW — Binary Runtime Environment for Wireless
• D/I — Drop and Insert
• WCMP — Wireless Control Message Protocol
• CYTA — Cyprus Telecommunications Authority
• DSX — Digital Signal Cross-Connect
• CU — Cooling Unit
• AFIPS — American Federation of Information Processing Societies
• NARC — Non-Automatic Relay Center
• LAC — Line Assignment Center
• LMU — Line Monitor Unit
• EADAS — Engineering and Administrative Data Acquisition System
• MIR — Maximum Information Rate
• TRANS — Transaction
• DSP — Data Service Provider
• DTU — Data Terminal Unit
• V — Vector
• LEC — Liquid Encapsulated Czochralski
• RBT — Ring Back Tone
• IDSL — ISDN (Integrated Services Digital Network) Digital Subscriber Line
• IDEN — Integrated Dispatch Enhanced Network
• WLNP — Wireless Local Number Portability
• CUSA — Central Urban Service Area
• FOE — Fiber Optic Equipment
• DCS — Digital Cross-connect Switch
• DMB — Disconnect and Make Busy
• SMAS — Service Management System
• ASA — Avaya Site Administration
• WIM — WAP (Wireless Application Protocol) Identity Module
• ISTD — International Subscriber Trunk Dialing
• EDGE — Enhanced Data for GSM (Global System for Mobile communication) Evolution
• CMS — Conversational Monitor System
• SIGTRAN — Signaling Transport
• SPT — System Page Table
• WBOK — Wireless Broadband of Oklahoma
• D-AMPS — Digital Advanced Mobile Phone Service
• ASP — Active Signaling Protocol
• AS — Active Service
• CS — Connection Segment
• DM — Design Manager
• ZBTSI — Zero Byte Time Slot Interchange
• SMG — Super Master Group
• VGC — Voice Grade Channel
• SVW — Sioux Valley Wireless
• TEL & TEL — TELephone and TELegraph
• SIO — Service Information Octet
• DTS — Digital Terminal Systems
• AUSPI — Association of Unified Telecom Service Providers of India
• OCI — object code insertion
• CSLIP — Compressed SLIP

• SYNC — Synchronization
• MTS — Message Transmission Subsystem
• ISP — International Signaling Point
• SMDS — Switched Multi-megabit Data Service
• NHRP — Next Hop Resolution Protocol (ATM)
• TPF — Transmission Priority Field
• DACS — Digital Access Cross-Connect Switch
• ADAD — Automatic Dialing Announcing Device
• SCRC — SCCP Routing Control
• BPOP — Building Point of Presence
• ARQ — Admission Request
• ACEK — Authentication Encryption Key
• CSP — Continuous Speech Processing
• TRANSEC — Transmission Security