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

• CONG — Congestion message
• RAEX — Roaming Agreement EXchange
• BPM — Beats Per Minute
• POC — Point Of Contact
• MAN — Metropolitan Area Network
• CSMA — Carrier Sense Multiple Access
• PPM — parts per million
• S X S — Step-by-Step
• S-BCCH — Short Message Service Broadcast Control Channel
• ISO — In Search Of
• FDIC — Federal Deposit Insurance Corporation
• XA-FR — Exchange Access Frame Relay
• CPU — Central Processing Unit
• TEMIP — Telecommunications Management Information Platform
• SD — Standard Deviation
• UAX 14 — Unit Automatic eXchange type 14
• CPE — Customer Premises Equipment
• X-OFF — Transmitter Off
• C4I — Command, Control, Communications, Computers, & Intelligence
• IRC — Internet Relay Chat
• EPA — Environmental Protection Agency (US)
• X-ON — Transmitter On
• C-NBAP — Common Node B Application Part
• A-KEY — Authentication key
• B-ICI — Broadband Inter-Carrier Interface
• WACN ID — Wide Area Communications Network IDentifier
• E-LEAD — Ear Lead
• P&L — Profit and Loss statement
• COB — close of business (End of duty day)
• MLS — Microwave Landing System
• FIFO — First In, First Out
• ZDBOP — Ziff-Davis Benchmark Operation
• PDF — Portable Document Format (created by Adobe Acrobat)
• OC-256 — Optical Carrier Signal, Level 256
• NMSE — Normalized Mean Square Error
• I.LINK — IEEE 1394, High Performance Serial Bus, implementation
• LLC — Limited Liability Company
• SABGW — System Architecture Evolution Gateway
• FEMA — Federal Emergency Management Agency
• ECU — Electronic Control Unit
• PDR — Preliminary Design Review
• T-IC — T-interConnect
• QC — Quality Control
• DAM — Diagnostic Acceptability Measure
• M-CSI — Mobility management CAMEL (Customized Applications for Mobile network Enhanced Logic) Subscription Information
• UR — Your
• VIP — Very Important Person
• CDR — Critical Design Review
• D-NBAP — Dedicated Node B Application Part
• IP — Internet Protocol

• RFP — Request For Proposal
• OC-9 — Optical Carrier Signal, Level 9
• LRU — Line Replaceable Unit
• F2F — Face To Face (also Meeting In Person)
• CU — See You
• RFQ — Request For Quotation
• PO — Purchase Order
• OC-18 — Optical Carrier Signal, Level 18
• ISO — International Organization for Standardization
• RTN — Regional Telecommunication Network
• AUP — Acceptable Use Policy
• H323 — ANSI standard for format over IP
• DAHDI — Digium/Asterisk Hardware Device Interface
• EAP — Employee Assistance Program
• T-CARRIER — Trunk Carrier
• PDT — Pacific Daylight Time
• VC-ATOD — Virtual Clearinghouse on Alcohol, Tobacco and Other Drugs
• ASTM — American Society for Testing and Materials (Philadelphia, Pennsylvania)
• CR — Carriage Return
• WTG — Way To Go
• CY — Calendar Year
• ADM — Add-Drop Multiplexer
• RF — Radio Frequency
• D-H — Diffie-Hellman
• ATTN — Attention
• EDI — Electronic Data Interchange
• KBYTE — Kilobyte (103)
• IRR — Internal Rate of Return
• GSM — Global System for Mobile Communications
• CV — Curriculum Vitae
• ISP — Internet Service Provider
• VAZO — Violating All-Zero Octet
• ACH — Automated Clearing House
• CEO — Chief Executive Officer
• LCD — Liquid Crystal Display
• C³CM — Command, Control and Communications Countermeasures
• CCB — Change Control Board
• FET — Field Effect Transistor
• ATM — Asynchronous Transfer Mode
• DSC — Differential Scanning Calorimetry
• DBORS — Data Base of Records
• QFSK — Quadrature Frequency Shift Keying
• AC — Alternating Current
• AFAIK — As Far As I Know
• IPO — Initial Public Offering
• WBS — Work Breakdown Structure
• MOU — Memorandum of Understanding (an MOU between Food & Drug Administratin and a regulatory agency in another country allows mutual recognition of inspections)
• DWDM — Dense Wavelength-Division Multiplexing
• GUI — Graphical User Interface (goo-ey)
• TQM — Total Quality Management

• RDY — Ready
• BRB — Be right back
• VAT — Value Added Tax
• BTU — British Thermal Unit
• WWW — World Wide Web
• WB — Welcome Back
• EST — Eastern Standard Time
• AMD — Advanced Micro Devices, Inc. (producer of computer chips)
• ADSL — Asymmetric Digital Subscriber Line
• API — Application Programming Interface
• ABC — activity based costing
• ASCII — American National Standard Code for Information Interchange
• SMTP — Simple Mail Transfer Protocol
• R&D — Research & Development
• CUG — Closed User Group
• GIS — Geographic Information System
• WML — Wireless Markup Language
• CSA — Canadian Space Agency
• MTBF — Mean Time Before Failure
• SLA — Service Level Agreement
• ABI — Application Binary Interface
• IRL — In Real Life
• AIR — Account Information and Refill
• DOA — dead on arrival
• SAR — Search And Rescue
• PDA — Personal Digital Assistant
• PUHU — Pick Up Hang Up
• ICT — Information and Communication Technology
• ASME — American Society of Mechanical Engineers
• EDS — Electronic Data Systems Corporation
• SME — Subject Matter Expert
• ASA — American Standards Association
• SRAM — Static Random Access Memory (ess-ram)
• AOL — America on line
• DAC — Discretionary Access Control
• RPI — Retail Price Index
• COR — Carrier Operated Relay
• MOB — Mobile
• RQMT — Requirement
• ESA — European Space Agency
• BVR — Beyond Visual Range
• TNYWR — The Number You Will Receive
• NYSE — New York Stock Exchange
• MRI — Magnetic Resonance Imaging
• UDP — User Datagram Protocol (FDDI related)
• EIS — Executive Information System
• O&M — Operation and Maintenance
• ATA — Area Transportation Authority
• PVT — Private
• VPN — Virtual Private Network (ATM)

• GATT — General Agreement on Tariffs and Trade (government)
• HTTP — Hypertext Transfer Protocol
• GPS — Global Positioning System (ex-NAVSTAR)
• FAQ — Frequently Asked Questions (sometimes Pronounced Fak)
• CD — Compact Disc
• EOM — End Of Message
• CGI — Common Gateway Interface
• ACE — Access Control Entry
• NPV — Net Present Value {economics}
• RPM — Revolutions Per Minute, (Rotations Per Minute)
• JV — Joint Venture
• PCB — printed circuit board
• EU — European Union (1994; formerly referred to as the EEC or EC)
• CIO — Chief Information Officer
• ARPA — Advanced Research Projects Agency (made early internet)
• MIS — Management Information System (OSHA)
• NPI — New Product Introduction
• AM — Ante Meridian
• DFD — Displaced Frame Difference
• 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.
• SAN — Storage Area Network
• CB — Call Back
• DBMS — Database Management System
• CAE — Computer-Aided Engineering
• NFS — Network File System
• CPM — Critical Path Method
• ATCRBS — Air Traffic Control Radar Beacon System
• IVR — Interactive Voice Response (telephone technology)
• ACK — ACKnowledgment
• MST — Mountain Standard Time
• RAM — random-access memory
• DOD — United States Department of Defense
• MBR — Master Boot Record
• CRT — Cathode Ray Tube (type of TV)
• RFC — Request For Comment
• RFI — Request For Information. Sales department shorthand. Special priority when use in conjunction with RFN (see below).
• EVP — Executive Vice President
• FAA — Federal Aviation Administration
• WWW3 — World Wide Web Consortium
• QMS — Quality Management System
• BFI — Brute Force and Ignorance. An expression found in everyday language since the early 1900s, meaning a heavy handed unrefined solution to a problem (especially fixing something - like bashing an electrical appliance to get it working again). In more recent
• CCSDS — Consultative/Consultative Committee for Space Data Systems
• TBD — To Be Determined
• ACC — Adaptive Cruise Control
• AIS — Automated Information System
• COO — Chief Operation Officer
• NOS — Network Operating System
• FX — Foreign Exchange
• CCM — counter-countermeasure
• SDMA — Space Division Multiple Access

• AES — Advanced Encryption Standard
• SDR — Special Drawing Rights
• ACK — Acknowledge (telecommunications; Cf. NAK)
• AM — Amplitude Modulation
• TTYL — Talk To You Later (Internet Slang)
• PDH — Plesiochronous Digital Hierarchy
• WDM — Wavelength Division Multiplexing (fiber optics)
• PSK — phase-shift keying
• CPT — Carriage Paid To
• EC — European Commission
• AE — Account Executive
• FIPS — Federal Information Processing Standard
• CIS — Commonwealth of Independent States
• DES — Data Encryption Standard
• RDBMS — Relational Database Management System
• IETF — Internet Engineering Task Force
• VM — Voice Mail
• MB — Megabyte
• ADD — Addendum
• JIT — Just in time
• DSS — Decision Support System
• PGP — Pretty Good Privacy (encryption)
• WAN — Wide Area Network
• WEP — Wired Equivalent Privacy
• SOW — Statement Of Work
• DSCP — Differentiated Services Control Point
• PDN — Public Data Network
• DRAM — Dynamic Random Access Memory (dee-ram) (computing)
• LRJ — Location Reject
• QOS — Quality of Service
• CIR — Committed Information Rate (Frame Relay)
• SWAG — Scientific Wild Ass Guess
• GPRS — General Packet Radio Service
• SLIP — Serial Line Interface Protocol
• CBT — Computer Based Training
• BIP — Bit-Interleaved Parity
• MDF — Main Distribution Frame
• ACM — Association for Computing Machinery
• CAD — Computer Aided Designer
• VVX — Voice and Video eXchange
• Q&A — Question & Answer
• DB — Decibel
• NATO — North Atlantic Treaty Organisation
• WWW — World Weather Watch
• MTTR — Mean Time To Repair
• SCC — Standards Council of Canada
• EEC — European Economic Community (predecessor of the European Union|EU)
• AATSR — Advanced Along-Track Scanning Radiometer
• FM — frequency modulation
• APT — Automatic Picture Transmission

• SQA — Software Quality Assurance
• BUR — Bandwidth Usage Redundancy
• AGC — Automatic Gain Control
• RM — Regional Manager
• QA — Center for Quality Assurance in International Education
• BSD — Berkeley Software Distribution
• DNS — Domain Name System
• CRM — Customer Relationship Management
• POP — Point Of Presence (Internet)
• DARPA — Defense Advanced Research Projects Agency (US)
• CS — Computer Science
• AOA — Angle Of Arrival
• MMS — Multimedia Messaging Service
• DHCP — Dynamic Host Configuration Protocol
• OCR — Optical Character Recognition
• DDD — Direct Distance Dial
• ADR — Address
• UPS — Ultraviolet Photoelectron Spectroscopy
• GSA — U.S. General Services Administration
• SDD — Software Design Document
• ROI — Return on Investment
• ENIAC — Electronic Numerical Integrator And Computer
• ALC — Automatic Level Control
• PNG — Portable Network Graphics (graphic file standard/extension)
• MSN — Microsoft Network
• SAS — Statistical Analysis System
• NIC — Network Interface Card
• ACL — Access Control List
• NIH — Not Invented Here
• TNX — Thanks
• AME — Amplitude Modulation Equivalent
• ABET — Accreditation Board for Engineering and Technology, Inc.
• ACE — Advanced Computing Environment
• HVAC — Heating, Ventilation, and Air Conditioning
• IRS — U.S. Internal Revenue Service
• RWR — Radar Warning Receiver
• AAC — Advanced Audio Coding
• TCO — Total Cost of Ownership
• UAV — Unmanned Aerial Vehicle
• SCSI — Small Computer System Interface
• BCC — Blind Carbon Copy
• ISDN — Integrated Services Digital Network
• PRI — Primary Rate Interface (ISDN)
• ATC — Air traffic control
• DSA — Digital Signature Algorithm
• BR — Branch
• DOJ — Department of Justice (US)
• CDT — Central Daylight Time
• EBCDIC — Extended Binary Coded Decimal Interchange Code (pronounced Eb-see-dik) (cf. BCD)
• SIC — Standard Industrial Classification (Code)

• Y2K — Year 2000
• CC — Carbon Copy
• ECO — Engineering Change Order
• CTD — Cumulative Trauma Disorder
• TNSTAAFL — There's No Such Thing As A Free Lunch
• FAR — Federal Aviation Regulation
• PM — Preventive Maintenance
• CAM — computer aided manufacturing
• STS — Space Transportation System
• ACD — Automatic Call Distributor
• DMSP — Defense Meteorological Satellite Program (U.S.)
• 100BASE-T2 — 100 Megabits per Second, Baseband, Two-pair Category 3 UTP cables
• VHF — Very High Frequency
• DDL — Data Definition Language
• FFT — Fast Fourier Transform
• CFO — Communication Filing Officer
• ADM — Add/Drop Multiplexer
• RDP — Radar Data Processing
• NEC — National Electrical Code
• PC — Personal computer (host)
• AES — Auger Electron Spectroscopy
• OBO — Or Best Offer
• DNS — Domain Name Service
• DSL — Digital Subscriber Line
• RAID — Redundant Array of Inexpensive Disks
• BPS — bits per second
• SBU — Strategic Business Units
• DME — Distance Measuring Equipment
• DC — Direct Current
• EDVAC — Electronic Discrete Variable Automatic Computer
• BBS — Bulletin Board System
• ADPE — Automatic Data Processing Equipment
• CST — Central Standard Time (UTC-6 Hours)
• VIRUS — Vital Information Resources Under Siege
• NIST — National Institute of Standards and Technology
• AQL — Acceptable Quality Level
• RNC — Radio Network Controller
• JAXA — Japan Aerospace Exploration Agency
• EDT — Eastern Daylight Time
• EFF — Electronic Frontier Foundation
• AD — Active Directory
• DTE — Data Terminal Equipment
• CMS — Content Management System
• EMG — Electromyogram
• PERT — Program Evaluation and Review Technique
• ACO — Additional Call Offering
• CDR — Call-Detail Record
• EFT — Electronic Funds Transfer
• ASP — Application Service Provider
• ABR — Available Bit Rate

• CMM — Capability Maturity Model
• DLR — Design Layout Record
• ROFL — Rolling on the floor laughing
• CU — Control Unit
• BST — British Summer Time
• ERP — Enterprise Resource Planning
• DLL — Dynamic Link Library (computer file)
• OMG — Object Management Group
• LEO — Low Earth Orbit (satellite communications)
• AAAI — American Association for Artificial Intelligence's
• CAUCE — Coalition Against Unsolicited Commercial Email
• UI — User Interface
• LED — law enforcement desk; light emitting diode
• AC — Access Control
• ASR — Airport Surveillance Radar
• EW — Electronic Warfare
• UTC — Coordinated Universal Time
• IM — Instant Message
• DFS — Distributed File System
• 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
• RFO — Reason For Outage
• SEI — Software Engineering Institute
• RACON — Radar Beacon
• ZIP — Zone Improvement Plan
• TCP — Transmission Control Protocol
• BPR — Business Process Re-engineering
• RM — Resource Management
• DDE — Dynamic Data Exchange (in software parlance)
• ITU — International Telecommunication Union
• ERT — Emergency Response Team
• WYSIWYG — What You See Is What You Get (pronounced Wizzy-wig. See Entry For Derived Acronyms)
• MRC — Monthly Recurring Charge
• HSD — High Speed Data
• DQE — Detective Quantum Efficiency
• MLS — Multiple Listing Service
• ATN — Aeronautical Telecommunication Network
• AGP — Accelerated Graphics Port
• SOHO — Small Office Home Office
• ARP — Address Resolution Protocol (ATM)
• SQL — Structured Query Language
• CMI — Computer Managed Instruction
• CAA — Civil Aviation Authority
• ISAKMP — Internet Security Association and Key Management Protocol
• AAAS — American Association for the Advancement of Science
• AT&T — American Telephone and Telegraph (U.S. company, also known as "Ma Bell")
• USB — Universal Serial Bus
• NMR — Nuclear Magnetic Resonance
• ROS — Return on Sales
• VTC — Video Teleconference
• VR — Virtual Reality

• AVHRR — Advanced Very High Resolution Radiometer  
• CFE — Contractor-Furnished Equipment
• FCC — Federal Communications Commission (US)
• RU — Are You?
• TC — Telephone Call
• HZ — cycles per second (hertz)
• AADC — Automated Area Distribution Center
• EAP — Extensible Authentication Protocol
• ASK — amplitude shift keying
• SAIC — Science Applications International Corporation
• SCM — Supply Chain Management
• DTX — Discontinuous Transmission
• USD — United States Dollar
• EEG — Electro-EncephaloGram
• PECVD — Plasma-Enhanced Chemical Vapor Deposition
• CHAP — Challenge Handshake Authentication Protocol (ATM)
• RPC — Remote Procedure Call
• ATS — applications technology satellite
• UHF — Ultra High Frequency (300-3000 MHz; 1m-10cm)
• TCB — Trusted Computing Base
• CLI — Command line Interface (Cabletron)
• ATM — Adobe Type Manager
• B2B — Business to Businesse
• PMA — Physical Medium Attachment
• NSF — National Sanitation Foundation
• IP — Intellectual Property
• CRL — Certificate Revocation List
• AF — Audio Frequency
• DSTE — Digital Subscriber Terminal Equipment
• TCP/IP — transmission control protocol/internet protocol
• SMS — Short Message Service
• TV — Television
• UN — United Narions
• DQPSK — Differential Quadrature Phase-Shift Keying
• CM — Configuration Management
• OSHA — Occupational Safety and Health Act (1970)
• ISRO — Indian Space Research Organisation
• SBC — Southwestern Bell Corporation
• W3C — World Wide Web Consortium
• STP — standard temperature and pressure (0° and 1 atm)
• ISBN — International Standard Book Number (ISO 2108)
• BRI — Basic Rate Interface
• NTIS — National Technical Information Service Technology Administration
• I/O — Input/Output
• QI — Quality Improvement
• COQ — Cost Of Quality
• ASEAN — Association of South East Asian Nations
• PM — post meridian
• DOS — Disk Operating System
• B3ZS — bipolar 3-zero substitution

• WIPO — World Intellectual Property Organization
• FDDI — Fiber Distributed Data Interface
• CCIS — Common Channel Interoffice Signaling
• AE — Application Entity
• NTIA — National Telecommunications and Information Administration
• KISS — Keep It Simple Stupid
• NEMA — National Electric Manufacturer's Association
• CIM — Common Information Model
• MDA — Monochrome Display Adapter
• ISSN — International Standard Serial Number (ISO 3297)
• BECN — Backward Explicit Congestion Notification
• DCN — Design Change Notification
• SLF — Super Low Frequency
• PM — Project Manager
• SVP — Senior Vice President
• SIG — Special Interest Group
• NSA — National Security Agency
• HDML — Handheld Device Markup Language
• PPB — parts per billion (109)
• AT&T — American Telephone & Telegraph
• SP — Service Provider
• EOT — End Of Transmission
• AWG — American Wire Gauge
• NOAA — National Oceanic and Atmospheric Administration (US)
• ICMP — Internet Control Message Protocol
• ATF — Advanced Tactical Fighter
• APIC — Advanced Programmable Interrupt Controller
• AP — Application Protocol
• EPR — Ethylene-Propylene Rubber
• OFC — Office
• CRC — Contrôle de Redondance Cyclique (French: Cyclic Redundancy Check)
• EEPROM — Electrically Erasable Programmable Read-Only Memory
• PE — Polyethylene
• IANA — Internet Assigned Numbers Authority
• PAR — Precision Approach Radar
• AFC — Automatic Frequency Control
• AEC — Architecture, Engineering, Construction
• FCA — Free Carrier
• LF — Low Frequency
• CIA — Central Intelligence Agency
• M — Meter
• PST — Pacific Standard Time (UTC-8 Hours)
• BJT — Bipolar Junction Transistor
• DCOM — Distributed Component Object Model
• RFI — Radio Frequency Interference
• AMT — Amount
• OSI — Open Systems Interconnection (iso Standard)
• BCD — Binary-Coded Decimal
• ISS — International Space Station
• BER — Bit-Error Rate

• ITSEC — Information Technology Security Evaluation Criteria
• MHS — Message Handling System (electronic)
• NA — Not Applicable
• JPEG — Joint Photographic Experts Group (24-bit image storage format)
• CW — Continuous Wave
• PT — Project Team
• DMTS — Distinguished Member Of Technical Staff
• SGML — Standard Generalized Markup Language
• CORBA — Common Object Request Broker Architecture
• LMS — Learning management system
• WMO — World Meteorological Organization (ICSU)
• FTTB — Fiber To The Building
• SPC — Statistical Process Control. Forerunning quality theory from the 1960s to TQC and TQM.
• BT — British Telecommunications
• DTI — Department of Trade and Industry (UK)
• VAC — Vacant
• MAC — Message Authentication Code
• TOS — Type Of Service
• PLD — Programmable Logic Device
• SAE — Society of Automotive Engineers
• PWD — Password
• CBC — cipher block chaining
• OSS — Operational Support System
• ADT — Atlantic Daylight Time (UTC-3 Hours)
• CUL — See You Later
• MF — Medium Frequency
• IMEI — International Mobile Equipment Identity
• WTO — World Trade Organisation
• NMT — Nordic Mobile Telephone
• EDP — Electronic Data Processing Plc (London Stock Exchange [LSE])
• ADT — Abstract Data Type
• LCP — Link Control Protocol
• AT — Advanced Technology
• ASQC — American Society for Quality Control's
• BSOD — Blue Screen Of Death
• SXS — Step-By-Step
• PSTN — Public Switched Telephone Network
• RCU — Remote Control Unit
• ACTV — Active
• Z — Zero
• FASB — Financial Accounting Standards Board
• OS — Operating System
• SPC — Stored Program Control
• EISA — Extended Industry Standard Architecture
• FCS — Frame check sequence (Ethernet)
• GRE — Generic Routing Encapsulation
• T&C — Terms & Conditions
• AVL — Available
• SHA — Secure Hash Algorithm
• KHZ — kilohertz (1000 cycles per second)

• JIS — Japanese Industrial Standard
• ERP — Enterprise Resource Management
• EGA — Enhanced Graphics Adapter
• CIC — Circuit Identification Code
• ARA — Apple Remote Access
• MIME — Multipurpose Internet Mail Extension
• BIS — Bureau of Indian Standards
• AMI — Advanced Metering Infrastructure
• MMU — Memory Management Unit
• AXE 10 — Series of electronic telephone exchanges from L.M. Ericsson
• LP — Low Pressure
• ECP — Engineering Change Proposals
• SSL — Secure Socket Layer
• DMA — direct memory access (computer term)
• BS — Base Station
• PBX — Private Branch eXchange (company phone system)
• HSDPA — High-Speed Downlink Packet Access
• SML/SMS — Service Management Layer/Service Management Service
• TPDU — Transport Protocol Data Unit
• PDU — Protocol data unit (such as segment, packet, frame, etc.)
• RSVD — Reserved
• ADF — Automatic Direction Finder
• TAC — Technical Assistance Center
• EDD — Envelope Delay Distortion
• QAM — quadrature amplitude modulation
• URI — Uniform Resource Identifier
• PPP — Point-to-Point Protocol
• ACFQ — Absence Compensation Fair Queuing
• DSSS — Direct Sequence Spread Spectrum
• CFD — computational fluid dynamics
• JPL — Jet Propulsion Laboratory (California Institute of Technology) (NASA)
• RFD — Request For Discussion
• RCC — Rescue Coordination Center
• CDMA — Code Division Multiple Access (voice/data transmission)
• BBU — Baseband Unit
• FCW — Federal Computer Week
• NAFTA — North American Free Trade Agreement
• NIST — National Institute of Standards & Technology (US)
• CGI — Computer-Generated Imagery
• PABX — private automatic branch exchange (telephone)
• MS — Mobile Station
• OSPF — Open Shortest Path First (ATM)
• DLC — Digital Loop Carrier
• BPRZ — Bipolar Return-to-Zero
• WAP — Wireless Application Protocol
• SNMP — Simple Network Management Protocol (ATM)
• KM — Knowledge Management
• WLTF — Wireless LAN (Local Area Network) Task Force
• DSA — Directory System Agent
• C4 — Command, Control, Communications, and Computers

• AS — Autonomous System
• NRC — National Research Council (Canada)
• BNSC — British National Space Centre
• DUP — Duplicate
• LEC — Local Exchange Carrier
• MOS — Model Output Statistics
• HTTPS — HyperText Transfer Protocol Secure
• UAS — Unavailable Seconds
• RACF — Resource Access Control Facility
• DIT — Directory Information Tree
• APPL — Application
• ELF — Extremely Low Frequency
• ICANN — Internet Corporation for Assigned Names and Numbers
• DCE — Distributed Computing Environment
• CATV — Cable Television
• SIL — Speech Interference Level
• RTU — Remote Terminal Unit
• CCSD — command communications service designator; control communications service designator
• D-RAM — Dynamic Random Access Memory
• ADN — Advanced Digital Network
• ISO — Infrared Space Observatory
• CERT — Computer Emergency Response Team
• RMS — root mean square (preferred over "RMS")
• ECR — Electronic Cash Register
• MIC — Message Integrity Check
• B2C — Business-to-Consumer
• DOM — Document Object Model
• VB — Visual Basic
• RIP — Routing Information Protocol
• NBS — National Bureau of Standards (US)
• IEC — International Electrotechnical Commission
• MS — Millisecond
• WAFB — Wireless Absolute Fairness Bound
• GB — Gigabyte
• ECE — Economische Commissie voor Europa (United Nations) (Dutch: Economic Commission for Europe)
• MS — Message Store
• HDLC — High-Level Data Link Control
• PLMN — Public Land Mobile Network
• JSC — Johnson Space Center (Houston, TX)
• ME — Mobile Equipment
• 9 — Nine
• OM — Old Man
• NAS — Network Access Server
• CAM — Computer-Aided Mapping
• NESDIS — National Environmental Satellite, Data, and Information Service
• EMC — Electromagnetic Compatibility
• DNIS — Dialed Number Identification Service
• SNR — Signal-to-Noise Ratio
• CFA — Carrier Facility Assignment
• NCSA — National Center for Supercomputing Applications

• DSP — Digital Signal Processor
• RFS — Request For Service
• CRBT — Caller Ring Back Tone
• USGS — United States Geological Survey (DOI)
• LCN — Logical Channel Number
• HW — Hardware
• ISAS — Institute of Space and Astronautical Sciences (Japan)
• ELINT — Electronic Intelligence Satellite
• RAD — Rapid Application Development
• CIM — Corporate Information Management
• DMX — De-MultipleXer
• DT — DWDM (Dense Wavelength Division Multiplexing) Terminal
• SIT — Static Induction Transistor
• PIN — Personal Identification Number
• EMS — Express Mail Service
• IW — Information Warfare
• TLS — Transport Layer Security
• ECMA — European Computer Manufacturer's Association
• ASQ — Alpha System Qualification
• APC — American Power Conversion
• CRIS — Carrier Route Information System
• IMPACT — Integrated Manufacturing Precision Assembly Cellular Technology
• IRS — Interface Requirements Specification
• HF — High Frequency
• ADC — Analog-Digital Converter
• CG — Coast Guard
• MIPS — Millions of Instructions Per Second
• CMP — Connection Management Protocol
• VDS — Variable Depth Sonar
• WB — Write Back
• VOL — Volume
• IRLAN — Infrared LAN
• CES — Consumer Electronics Show
• YL — Young Lady
• YP — Yellow Pages
• 3G — Third Generation mobile phone network
• TM — Technical Manual
• SCADA — Supervisory Control And Data Aquisition
• PDS — Protected Distribution System
• DC — Disconnected
• STM — Short Term Memory
• DTR — Data Terminal Ready
• MVS — Multiple Virtual Storage
• BYOD — Bring Your Own Device
• MS — Management System
• AMI — Alternate Mark Inversion
• TTYL — Type To You Later
• PVC — Permanent Virtual Circuit (ATM)
• LLC — Logical Link Control
• DPC — Destination Point Code

• CATV — Community Antenna Television
• EAI — Enterprise Application Integration
• CDS — Cell Directory Service
• AT — Access Tandem
• OMS — Optical Multiplex Section
• IS — Intermediate System
• DASD — Direct Access Storage Device
• SOGA — Share of Gross Adds
• FC — Fibre Channel
• CIS — CompuServe Information Service
• RSVP — Resource Reservation Protocol (Internet)
• BUS — Business
• LF — Line Feed
• ROTFL — Roll On The Floor Laughing
• CS — Cable Select
• SPA — Special Prorate Agreement
• TAG — Technical Advisory Group for Biological Control Agents of Weeds
• CA — Certificate Authority
• ECN — Explicit Congestion Notification
• CLNP — ConnectionLess-mode Network Protocol
• RSN — Real Soon Now [which may be a long time coming]
• STI — Speech Transmission Index
• PRF — Pulse Repetition Frequency
• PAN — Personal Area Network
• CHF — Swiss Franc
• CG — Center of Gravity (DXS)
• AR — Access Rate
• APS — Automatic Protection Switching (SONET/SDH)
• CSO — Customer Service Operations
• RAN — Radio Access Network
• ARPU — Average Revenue Per User
• RH — Relative Humidity
• LD — Long Distance
• MAC — Media Access Control
• LLU — Local Loop Unbundling
• ANI — Automatic Number Identification (Caller ID)
• LPE — Liquid Phase Epitaxy
• CAB — Conformity Assessment Body
• OTN — Optical Transport Network
• WMAN — Wireless Metropolitan Area Network
• SEM — Space Environment Monitor
• TG — Task Group
• VLF — Very Low Frequency
• BGP — Border Gateway Protocol (routing protocol)
• SSM — Source-Specific Multicast
• DCS — Digital Cross-connect System
• STA — State
• 1000BASE-T — 1000 Megabits per Second, Baseband, Twisted Pair
• SOAP — Simple Object Access Protocol
• CBDS — Connectionless Broadband Data Service

• VOIP — Voice Over IP (Internet Protocol)
• LDAP — Lightweight Directory Access Protocol (pronounced Ell-dap)
• DIBL — Drain-induced Barrier Lowering
• AIS — Alarm Indication Signal
• PAL — Programmable Array Logic
• PD — Public Domain
• AML — Amplitude Modulated Link
• VM — Virtual Machine
• IS — International Standard
• CABS — Carrier Access Billing System
• OLE — Object Linking and Embedding (Microsoft communication protocol)
• COO — Cost of Ownership
• CEV — Controlled Environment Vault
• MCSD — Microsoft Certified Solution Developer
• CIFS — Common Internet File System
• FCA — Free Carrier Absorption
• MIB — Management Information Base (ATM)
• ACR — Attenuation Crosstalk Ratio
• FTTH — Fiber To The Home
• PET — positron emission tomography
• ESTEC — European Space Research and Technology Centre
• IPX — Internetwork Packet Exchange
• JST — Japan Standard Time
• CO — Certificate of Origin
• NIC — Network Information Center
• ASI — Asynchronous Serial Interface
• SVC — Scalable Video Coding
• CC — Call Control
• TB — Terabyte
• MHS — Microwave Humidity Sounder
• ACT — ACTIVITY, ACTIVITIES
• MTSO — Mobile Telephone Switching Office
• NLMS — Normalized Least Mean Square
• PCI — Peripheral Component Interconnect
• BRA — Basic Rate Access
• CAV — Constant Angular Velocity
• AU — Audio Unit
• MDA — Model Driven Architecture
• AYT — Are You There
• MGMT — Management
• BT — BlueTooth
• CRO — Central Records Office
• DAP — Directory Access Protocol
• TS — Technical Specification
• EOB — End Of Business
• ACPI — Advanced Configuration and Power Interface
• VCC — Virtual Channel Connection (ATM)
• BLOS — Beyond Line-Of-Sight
• NOC — Network Operations Center
• SW — South West

• DSN — Deep Space Network - network of large antennas and communication facilities.
• NCS — National Communications System
• CMD — Command
• UPS — Uninterruptible Power Supply
• RTS — Request To Send
• IDT — Integrated Digital Terminal
• MPLS — Multi Protocol Label Switching
• CAD — Computer-Aided Design
• WG — Working Group
• VOD — Video On Demand
• UAN — Universal Access Number
• ITT — Invitation To Tender
• ISI — Inter-Symbol Interference
• E — Energy
• IIS — Internet Information Services
• COM — Component Object Model
• CCTA — Central Computer and Telecommunications Agency
• FAX — Facsimile
• AFSK — Audio Frequency Shift Keying
• PAP — Password Authentication Protocol (ATM)
• COMJAM — Communications Jamming
• WS — Workstation
• ISA — Industry Standard Architecture
• HTML — Hyper Text Markup Language
• POTS — Plain Old Telephone Service (FCW)
• SDH — Synchronous Digital Hierarchy (ATM)
• ZIP — Zone Information Protocol
• RJ-14 — Registered Jack type 14 (2-wire connector)
• ASR — Automatic Speech Recognition
• SCTP — Stream Control Transmission Protocol
• UML — Unified Modeling Language (Object Management Group, OMG)
• DOT — Department of Telecommunications (India)
• BIOS — Basic Input Output System
• DA — Destination Address
• MCD — Magnetic Circular Dichroism
• FR — Frame Relay
• EPR — Electron Paramagnetic Resonance
• NIS — Network Information Service
• DUC — Digital Up-Converter
• CF — Compact Flash
• NOTAM — Notice to Airmen
• AMHS — Automated Message Handling System
• ADCCP — Advanced Data Communications Control Procedures
• DRM — Digital Rights Management
• ASIC — application-specific integration circuit
• CBEMA — Computer & Business Equipment Manufacturers Association
• CMC — Career Management Center
• AMLCD — Active Matrix Liquid Crystal Display
• IRDA — Infrared Data Association
• OAS — Organization of American States

• DS — Digital Signal
• ATSR — Along-Track Scanning Radiometer
• PCMCIA — Personal Computer Memory Card International Association
• TE — Traffic Engineering
• LSR — Local Service Request
• EEA — European Economic Area
• DCMI — Dublin Core Metadata Initiative (Online Computer Library Center)
• YAHOO — You Are Hazy Over Oranges
• SKU — Stockkeeping Unit
• DIS — Distributed Interactive Simulation
• HSS — Home Subscriber Server
• AEW — Airborne Early Warning
• MPI — Message Passing Interface
• BPDU — Bridge Protocol Data Unit
• ECT — Explicit Call Transfer
• AFS — Andrew File System
• PDN — Packet Data Network
• VOC — Volatile Organic Compounds (air pollution)
• MME — Mobility Management Entity
• MBPS — Megabits per second
• NTFS — New Technology File System
• EMR — Electromagnetic Radiation
• JVM — Java Virtual Machine
• SA — Scientific American
• AOI — Area Of Interest
• MCU — Multipoint Control Unit
• RCV — Receive
• BG — Background
• VLL — Virtual Leased Line
• VXML — Voice eXtensible Markup Language
• MSU — Microwave Sounding Unit
• UA — User Agent
• TEC — Total Electron Content
• ESF — Edge Spread Function
• SVD — Singular Value Decomposition
• NIMBY — Not In My Back Yard
• PPARC — Particle Physics and Astronomy Research Council
• GDS — Global Distribution System
• NLM — National Library of Medicine (National Institutes of Health)
• BOFH — Bastard Operator From Hell
• 100BASE-T — 100 Megabits per second, Baseband, Twisted pair
• IN — Intelligent Network
• F — Fellow
• EPABX — Electronic Private Automatic Branch Exchange
• SPI — Service Provider Interface
• CAN — Campus Area Network
• WPAN — Wireless Personal Area Network
• VAS — Value Added Services
• VOP — Voice Over Packet
• DID — direct inward dial

• MC — Message Center
• ES — Errored Second
• STP — Spanning Tree Protocol
• RQMTS — Requirements
• APM — Advanced Power Management
• DCP — Design Change Package
• LQC — Line Quality Control
• ARIN — American Registry for Internet Numbers
• SM — Senior Member
• YYP — Yahoo Yellow Pages
• RDF — Radio Direction Finder
• FA — Functional Area
• TBD — To Be Decided
• RSRQ — Reference Signal Received Quality
• MSE — Mobile Subscriber Equipment
• CTS — Clear To Send
• LZ — Landing Zone
• EC — European Community
• CAC — Carrier Access Code
• FXO — Foreign Exchange Office
• HDSL — High-bit-rate Digital Subscriber Line
• ADL — Advanced Distributed Learning
• LPC — Linear Predictive Coding
• NI — Network Interface
• CFD — Call For Discussion
• FCP — Fibre Channel Protocol
• FAT — File Allocation Table
• TOP — Technical Office Protocol
• OAM&P — Operations, Administration, Maintenance & Provisioning
• CBP — Coded Block Pattern
• IMSI — International Mobile Subscriber Identity
• BOC — Bell Operating Company
• RARP — Reverse Address Resolution Protocol
• PGA — Programmable Gate Array
• CICS — Customer Information Control System (IBM Mainframe Software; Kicks Or C-I-C-S)
• EAC — Engineering Accreditation Commission
• GOS — Grade Of Service
• SAR — Specific Absorption Rate
• FUP — Fair Use Policy
• RT — Radiotelephone
• ARINC — Aeronautical Radio Incorporated
• SLP — Service Location Protocol
• CGM — Computer Graphics Metafile
• ADP — Automatic Data Processor
• TCSEC — Trusted Computer System Evaluation Criteria
• WLAN — Wireless Local Area Network
• CCD — Charge Coupled Device - a device for the movement of electrical charge.
• ADEOS — ADvanced Earth Observing Satellite (Japan)
• ESS — Electronic Switching System
• MTU — Maximum Transmission Unit

• AFP — AppleTalk Filing Protocol
• WPM — speech--words per minute
• MD — Mediation Device
• STP — Signal Transfer Point
• CFV — Call For Vote(s)
• PKI — Public Key Infrastructure (cryptography)
• CT — Computer Telephony
• UL — Uplink
• AIFF — Audio Interchange File Format
• BS — Beam Splitter
• BACP — Bandwidth Allocation Control Protocol
• SHF — Super High Frequency
• CSPRM — Common Signaling Protocols Resource Module
• 100BASE-T4 — 100 Megabits per Second, Baseband, Four-pair Category 3 UTP cables
• SCP — Service Control Point
• EAS — Extended Area Service
• PCM — Pulse-Code Modulation
• OTS — Optical Transmission Section
• P — Predicted
• ASR — Access Service Request
• DDS — Digital Data Service
• PSD — Phase-Sensitive Detector
• ADF — automatic document feeder
• NMS — Network Management System
• CMT — Cadmium Mercury Telluride
• ASTD — American Society of Training and Development (Alexandria, Virginia)
• DMARC — Demarcation point
• BAN — Base Area Network
• OSTP — Office of Science and Technology Policy
• GDM — GSM (Global System for Mobile communications) Data Module
• BERT — Bit Error Rate Tester (telecommunication)
• IP — Intelligent Peripheral
• RJ-25 — Registered Jack type 25 (6-wire connector)
• ECPA — Electronic Communications Privacy Act 1986
• TWT — Traveling Wave Tube
• ECAC — European Civil Aviation Conference
• VBR — Variable Bit Rate (ATM)
• MSR — Microwave Scanning Radiometer
• DDCMP — Digital Data Communications Message Protocol
• TO — Technical Order
• AAS — Adaptive Antenna System
• RRN — Routing Recording Number
• DX — Duplex
• COAX — Coaxial
• MP — Multilink Protocol
• ARQ — Automatic Repeat-reQuest
• ROSAT — Roentgen Satellite
• SATAN — Security Administrator Tool for Analyzing Networks
• OLAP — Online Analytical Processing
• TEL — Telephone

• MPEG — Motion Picture Experts Group
• IMC — Intermediate Metal Conduit
• 2W — Two Wire
• PUB — Publication (file name extension)
• STK — Satellite Tool Kit
• TIA — Telecommunications Industry Association
• ITP — Interactive Telecommunications Program
• TN — Telephone Number
• IV — Initialization Vector
• M — Management
• CPS — Cycles Per Second (now Hertz)
• LEP — Large Electron Positron
• E&M — ear and mouth (special signaling leads)
• RCS — Radar Cross Section
• 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)
• DBS — Direct Broadcast Satellite
• B-ISDN — Broadband Integrated Services Digital Network
• SPADATS — Space Detection And Tracking System
• SBC — Session Border Controller
• NFPA — National Fire Protection Association
• NNTP — Network News Transfer Protocol
• SEC — Software Engineering Center
• MCA — Micro Channel Architecture
• FITS — Flexible Image Transport System
• TLC — The Learning Channel
• DVP — Digital Voice Privacy
• CDA — Command and Data Acquisition
• OC — Optical Carrier
• E — Echo Time Zone
• STN — Station Casinos, Inc.
• QPSK — aeronautical quadrature phase shift keying
• WWAN — Wireless Wide Area Network
• AFM — Atomic Force Microscopy
• 911 — Emergency Services Phone Number
• TOS — Temporarily Out of Service
• NSAI — National Standards Authority of Ireland
• LEN — Line Equipment Number
• CSAT — Customer Satisfaction
• ECM — Electronic Counter Measures
• ESF — Extended Super Frame (ATM)
• LQR — Linear Quadratic Regulator
• PUK — PIN (Personal Identification Number) Unlocking Key
• CD — Critical Dimension
• BER — Basic Encoding Rules (ASN.1)
• TELECOMMUTE — Telecommuting
• KB — Kilobyte: One thousand and twenty-four bytes kbps kilo bit per second
• ARPANET — ARPA Network
• TI — Time Interval
• PDC — Personal Digital Cellular
• TRM — Technical Reference Model

• CU — Channel Unit
• BIP — Band Interleaved by Pixel
• RA — Risk Analysis
• RP — Reference Point
• VGA — Video Graphics Array
• AAF — Advanced Authoring Format
• BCH — Binary Coded Hexadecimal
• OPC — Originating Point Code
• KDC — Kerberos Key Distribution Center
• MIT — Massachusetts Institute of Technology (U.S.)
• EHF — Extremely High Frequency
• FSAI — Fiber Serving Area Interface
• AUD — Audit
• WPS — Wireless Priority Service
• CCNA — Cisco Certified Network Associated
• RT — Remote Terminal
• ELT — Emergency Locator Transmitter
• RSS — Really Simple Syndication
• BSA — Business Software Alliance
• Y — Yttrium
• IS — Information System
• FE — Far End
• PIM — Personal Information Manager
• NOAO — National Optical Astronomy Observatories (Tucson, AZ)
• DCS — Digital Cross-Connect
• WORM — Write-Once, Read-Many
• SDLC — Synchronous Data Link Control
• DID — data item description
• SDM — Service Delivery Management
• SVC — Switched Virtual Connection
• SAN — System Area Network
• MIS — Management Information Service
• SML — Service Management Layer
• DTD — Document Type Definition (XML)
• NNM — Network Node Manager
• MCC — Mission Control Center (JSC)
• LU — Logical Unit
• ARG — Argument
• DDN — U.S. Defense Data Network
• ODBC — Open Database Connectivity
• FR PVC — Frame Relay Permanent Virtual Connection
• EIP — Equipment installation procedure
• VC — Virtual Channel
• EMS — Enhanced Messaging Service
• AIN — Advanced Intelligent Network
• PDS — Planetary Data System
• EFS — Encrypting File System
• DSLAM — Digital Subscriber Line Access Multiplexer (Module)
• ECP — Encryption Control Protocol
• CO — Central Office

• GHZ — Gigahertz
• LNP — Local Number Portability
• SDK — Software Development Kit (Microsoft)
• OD — Outside Diameter
• MOL — Manned Orbiting Laboratory
• EX — Exercise
• MEID — Mobile Equipment Identifier
• CAPS — Call Attempts Per Second
• TCR — Temperature Coefficient of Resistance
• FSK — Frequency-Shift Keying
• TE — Terminal Equipment
• TCIC — Trunk Circuit Identification Code
• ASARS — Advanced Synthetic Aperture Radar System
• ACT — Activity
• EGP — Exterior Gateway Protocol
• POE — power over ethernetinjector
• SPGA — Staggered Pin Grid Array
• MMSI — Maritime Mobile Service Identity
• WINS — Windows Internet Name Service
• LRC — Learning Resource Center
• NIC — Network Interface Controller
• SRS — Software Requirements Specifications
• ADT — American District Telegraph Company
• ABN — Abnormal
• TDMA — Time Division Multiple Access
• DEC — Decimal
• APN — An Access Point Name
• TE — Test Equipment
• ARC — Army Reuse Center
• DAL — Dedicated Access Line
• SD — Software Development
• FAA — Federal Aviation Agency
• 10BASE-T — 10 Megabits per second, Baseband, Twisted pair
• JCL — Job Control Language
• ETS — European Telecommunication Standard
• OTA — Office of Technology Assessment (U.S.; abolished by Congress, Fall 1995)
• SUS — Suspension
• TCPA — Telephone Consumer Protection Act
• FWA — Fixed Wireless Access
• DL — Digital Library
• ATS — Automatic Transfer Switch
• NE — North-East
• MOD — Modify
• ORB — Object Request Broker
• LIU — Line Interface Unit
• FE — Finite Element
• ACAP — Application Configuration Access Protocol
• DAT — Digital Audio Tape
• ATA — Analog Telephone Adapter
• CER — Cell Error Ratio

• OCC — Occupancy
• BHCA — Busy Hour Call Attempt
• COMINT — Communications Intelligence
• CNM — Customer Network Management
• IRS — Inertial Reference System
• BIU — Bus Interface Unit
• CBR — Constant Bit Rate
• ACF — Access Control Field
• 4W — Four-Wire
• TDM — Time Division Multiplexer
• COMDEX — Computer Dealers Exposition
• DID — Digital Information Display
• OMA — Open Mobile Alliance
• VSAT — Very Small Aperture Terminal (satellite service)
• EMS — Element Management System (ATM)
• PTA — Pakistan Telecommunication Authority
• DII — Defense Information Infrastructure
• PROM — Programmable Read-Only Memory
• SOS — Save Our Souls (Help!)
• Y — Yes
• TTY — Teletype Telex Machine
• AAV — Accountholder Authentication Value
• BOD — Bandwidth on Demand
• NCP — Network Control Protocol
• TOA — Time Of Arrival
• IESG — Internet Engineering Steering Group
• VLSI — Very-Large-Scale Integration
• AWACS — Airborne Warning And Control System
• DCS — Digital Cellular System
• DIS — Draft International Standard
• SLAM — Scanning Laser Acoustic Microscope
• IEEE — Institute of Electrical and Electronics Engineers
• EIGRP — Enhanced Interior Gateway Routing Protocol
• NCSC — National Computer Security Center (NSA)
• AP — access point
• CPS — characters per second
• SCN — Switched Circuit Network
• TKIP — Temporal Key Integrity Protocol
• METRO — Metropolitan
• RT — Response Time
• ATC — Advanced Technology Center
• NTP — Network Time Protocol
• CSA — Canadian Standards Association (like UL)
• CTU — Central Terminal Unit
• HEX — Hexadecimal (base 16)
• CPN — Cisco Powered Network
• HEHO — Head End Hop Off
• AMPS — Advanced Mobile Phone System
• BTC — Botswana Telecommunications Corporation
• ISO — Independent System Operator (US) (see also TSO) Responsible for grid management, but does not own assets. (electricity)

• AM — Activity Manager
• DPL — Digital Power Line
• SL — Single Line
• VMS — Virtual Memory System
• CB — Common Battery
• PVD — Physical Vapor Deposition
• ACLR — Adjacent Channel Leakage Ratio
• ISOC — Internet Society
• TRLR — Trailer
• PIC — Peripheral Interface Controller
• COPS — Common Open Policy Service
• TDOA — Time Difference Of Arrival
• KAK — Key-Auto-Key
• IRQ — Interrupt Request
• WAIS — Wide Area Information Server
• AN — Access Node
• DSN — Defense Switched Network
• LR-WPAN — Low-Rate Wireless Personal Area Network
• VT — Virtual Terminal
• B6ZS — Bipolar 6 Zero Substitution
• RMI — Remote Method Invocation
• RAU — Radio Access Unit (Army)
• FEP — Front End Processor
• SPM — Scanning Probe Microscope
• EMCON — Electromagnetic Emission Control
• TSR — Telecommunications Service Request
• VBA — Visual BASIC for Applications
• PEM — Privacy-Enhanced Mail
• ADB — Apple Desktop Bus
• PS — Product Specification
• AMR — Automated meter reading also known as Automatic Meter Reading
• CDE — Common Desktop Environment
• MBWA — Mobile Broadband Wireless Access
• DTMF — Dual-Tone MultiFrequency
• A — Anode
• MLP — Mobile Location Protocol
• Q — Quadrature
• MX — Mixer
• B3G — Beyond Third Generation
• NES — Network Encryption System
• RLU — Remote Line Unit
• 3GPP — Third Generation Partnership Project
• CDC — Connected Device Configuration
• SWAP — Shared Wireless Access Protocol
• TXM — Transmission X-ray Microscope
• BS — Broadcast Satellite
• SPA — Software Publishers Association
• MUSIC — MUltiple SIgnal Classification
• DCN — Disconnect
• SMB — Server Message Block

• AMSS — Automatic Message Switching System
• CAM — Content Addressable Memory
• SAR — synthetic aperture radar (satellite)
• DVMRP — Distance Vector Multicast Routing Protocol
• LT — Less Than
• NPA — Numbering Plan Area
• LSF — Line Spread Function
• JTF — Joint Task Force
• OT — Office of Telecommunications
• SF — Single Frequency
• DC — Display Controller
• BIS — Business Information System
• LT — Line Termination
• DNIC — Data Network Identification Code
• B2B — Business-to-Business
• UP — User Profile
• TCM — Trellis-Coded Modulation
• CGSA — Cellular Geographic Service Area
• DCE — Data Communication Equipment
• DPL — Digital Private-Line
• DEMUX — Demultiplexer
• LISP — List Processing Language
• PMP — Project Management Professional
• DM — Domain Model
• VF — Voice Frequency
• AFOSR — Air Force Office Of Scientific Research(USA)
• DL — Data Link
• BBM — Blackberry Messenger
• IAB — Internet Architecture Board
• FEC — Forward Error Correction
• EIA — Extended Interaction Amplifier
• QDR — Quad Data Rate
• TLK — Talk
• BTAM — Basic Telecommunications Access Method
• AIT — Automatic Identification Technology
• PM — Phase Modulation
• CI — Common Interface
• FDL — Facility Data Link
• E — Echo
• SAI — Serving Area Interface
• SITA — Société Internationale de Télécommunications Aéronautiques
• PE — Probable Error
• JDK — Java Development Kit
• SA — Source Address
• SPD — Serial Presence Detect
• FMC — Fixed Mobile Convergence "Mobile UC or Unified Communications over Wireless"
• VOA — Voice Of America
• RADIUS — Remote Authentication Dial-In User Service
• ASDE — Airport Surface Detection Equipment
• EST — Establish

• CAMA — Centralized Automatic Message Accounting
• EFIS — Electronic Flight Information System
• DN — Distinguished Name
• PTP — Point to Point Transmission Service (electricity)
• TTY — teletype terminal
• LAG — Link Aggregation Group
• DER — Distinguished Encoding Rules
• MCP — Microsoft Certified Professional
• JRE — Java Runtime Environment
• DMS — Data Management System
• TDD — Time Division Duplex
• CQA — Certified Quality Auditor
• BSS — Base Station Subsystem
• TOVS — TIROS Operational Vertical Sounder
• VPI — Virtual Path Identifier
• CPC — Continous Packet Compression
• BSS — Basic Service Set
• EMI — Electro-Magnetic Interference
• CS — Convergence Sublayer (ATM)
• DSS — Digital Signature Standard
• NSS — Network Switching Subsystem
• MSRN — Mobile Station Roaming Number
• AS — Access System
• ES — Emergency Service
• 2W — 2-Wire
• PG — Page
• FLM — First Line Maintenance
• CODEC — Coder/decoder
• SDP — Software Development Plan
• EIR — Equipment Identity Register
• FEP — Front-End Processor
• EULA — End User License Agreement (usually in reference to software)
• ESP — Encapsulating Security Payload
• TL1 — Transaction Language 1
• QI — Quality Indicator
• VT — Vacuum Tube
• IRTF — Internet Research Task Force
• SMI — Structure of Management Information
• NAT — Network Address Translation
• IAD — Integrated Access Device
• PC — Peripheral Controller
• YABA — Yet Another Bloody Acronym
• EMEA — Europe, Middle East and Africa
• PP — Polypropylene
• OSCAR — Orbiting Satellite Carrying Amateur Radio
• TDD — Telecommunications Device for the Deaf
• DCS — Data Collection System (NOAA Polar Orbiting Satellites)
• JAN — Joint Army-Navy
• WWAN — wireless wide-area network
• DUA — Directory User Agent

• ISM — Industrial, Scientific and Medical
• C — Cost
• SIM — Subscriber Identity Module
• NRPB — National Radiological Protection Board
• BSI — British Standards Institution
• FTAM — File Transfer Access and Management
• LATA — Local Access and Transport Area
• FRS — Family Radio Service
• NIU — Network Interface Unit
• DVB — Digital Video Broadcasting
• IAT — Integrated Access Terminal
• FRS — Frame Relay Service
• ER — Extended Range
• SZ — Seizure
• RDI — Remote Defect Indicator (UNI Fault Management)
• NA — Network Adapter
• TRMM — Tropical Rainfall Measuring Mission (US-Japan)
• TC — Transmission Convergence (ATM)
• AMPS — Advanced Mobile Phone Service (cellular phone standard)
• DW — Deep Water
• CIAC — Computer Incident Advisory Capability
• FH — Frequency Hopping
• MDM — Mobile Device Management
• SONET — Synchronous Optical Network
• ADN — Abbreviated Dialing Number
• IT — Integration Test
• MRT — Medical Response Team
• ASA — Acoustical Society of America
• WAR — Weekly Activity Report
• SAS — Special Access Surcharge
• CRLF — Carriage-Return Line-Feed
• BNC — Bayonet Neill-Concelman
• LPD — Low Probability of Detection
• DDL — Digital Data Link
• HSCSD — High-Speed Circuit-Switched Data
• AC — Area Code
• CAL — Calorie
• CVR — Crystal Video Receiver
• AIF — Audio Interchange Format
• MIDP — Mobile Information Device Profile
• CAVE — Cellular Authentication and Voice Encryption Algorithm
• CCIR — International Radio Consultative Committee (French Acronym)
• DS-0 — Digital Signal, Level 0
• ETSI — European Telecommunications Standard Institute
• NDVI — Normalized Difference Vegetation Index
• SNA — System Network Architecture
• CP — Change Proposal
• EM — Electromigration
• SYM — Symmetric
• EBS — Electron Bombarded Silicon

• FEXT — Far-End Cross Talk
• PU — Physical Unit (IBM)
• SB — Switchboard
• IPCP — Internet Protocol Control Protocol
• CGA — Carrier Group Alarm
• NREN — National Research and Education Network
• HLR — Home Location Register
• TMS — Time Management System
• WHT — Walsh-Hadamard Transform
• E — Electra
• EEHO — Either End Hop Off
• TTY — Text Teletype
• 1-ESS — x-ESS series of Electronic Switching Systems
• CSPDN — Circuit Switched Public Data Network
• DPDU — Data Protocol Data Unit
• CONUS — Contiguous United States
• VRML — Virtual Reality Modeling Language
• IDF — Independent Distribution Frame
• TFTP — Trivial File Transfer Protocol (ATM)
• DMI — Distributed Management Interface
• AUI — Attachment Unit Interface
• OOP — Object-Oriented Programming
• SMR — Specialized Mobile Radio
• DPSK — Differential Phase Shift Keying
• RMS — Resource Management System
• WK — Week
• GBPS — Gigabits per second
• SCCP — Signalling Connection Control Part
• MV — Motion Vector
• GBT — Ground Based Tower
• CB — Citizens' Band
• STN — Station
• DDD — Direct Distance Dialing
• SIL — Solid Immersion Lens
• FDTD — Finite Difference Time Domain
• MAI — Multiple Access Interference
• DII — Dynamic Invocation Interface
• RDS — Rate Determining Step
• 1FB — Single line, Flat Business rate;
• CMOS — Complementary Metal Oxide Semiconductors
• PDT — Portable Data Terminal
• SG — Signaling Gateway (IETF)
• TSB — Telecommunication Standardization Bureau
• SDP — Session Description Protocol
• CIRC — Cross-Interleaved Reed-Solomon Code
• XPS — X-Ray Photoelectron Spectroscopy
• DISA — U.S. Defense Information Systems Agency
• BS — Backing Store
• PBT — Polybutylene Terephthalate
• UTP — unshielded twisted pair

• APDU — Application Protocol Data Units
• CAP — Capability
• RPV — Remotely Piloted Vehicle
• TSE — Toronto Stock Exchange
• IPS — InPlane Switching
• OTDOA — Observed Time Difference of Arrival
• PSS — Performance Support System
• DSCP — Differentiated Services Code Point
• VLAN — Virtual Local Area Network
• OBC — Onboard Computer
• T — Temperature
• POP — Post Office Protocol
• BCH — Bose-Chaudhuri-Hocquenghem Coding
• IEC — Interexchange Carrier
• ABBR — Abbreviation
• CC — Country Code
• FOSE — Federal Office Systems Exposition
• IRC — International Record Carrier
• BMEWS — Ballistic Missile Early Warning System (bee-mews)
• PCI — Personal Computer Interface
• L2TPV3 — Layer 2 Tunneling Protocol Version 3
• SPX — Sequenced Packet Exchange
• RISC — Reduced Instruction Set Computing
• ROW — Rest Of World
• FMS — Fraud Management System
• FRAD — Frame Relay Access Device
• STD — Subscriber Trunk Dialing
• DISN — Defense Information Systems Network
• CBWFQ — Class Based Weighted Fair Queueing
• RECON — Reconnaissance
• NTU — Network Termination Unit
• ACE — Adaptive Communication Environment
• SMDS — Switched Multimegabit Data Service (ATM)
• SLV — Satellite-Launch Vehicle
• FITL — Fiber-In-The-Loop
• GSM — Groupe Speciale Mobile
• DFE — Design For Environment
• LSI — Large Scale Integration -> VLSI
• LASA — Large Aperture Seismic Array
• GMRS — General Mobile Radio Service
• CVD — Chemical Vapor Deposition
• SIL — Silence
• DHD — Dial Home Device
• EBCDIC — Extended Binary-Coded Decimal Interchange Code
• MLM — Multi-Longitudinal Mode
• AF — Assured Forwarding
• SAF — System Access Fee
• ANSI-41 — ANSI standard for mobile management
• BELLCORE — Bell Communications Research, Inc.
• ISMI — International mobile subscriber identity

• ADC — Access Deficit Charge
• FTTC — Fiber To The Curb光纤到路边
• VTS — Vessel Traffic Service
• TAD — Telephone Answering Device
• LOO — Likelihood of Occurrence
• SMPTE — Society of Motion Picture and Television Engineers, Inc.
• TRS — Trunked Radio Systems
• NAK — Negative Acknowledge
• WTLS — Wireless Transport Layer Security
• IPVX — Internet Protocol version X
• ASYNC — Asynchronous
• RJE — Remote Job Entry
• BSS — Base Station System
• RCC — Radio Common Carrier
• DTN — Data Transfer Network
• DOR — Detailed Outage Report
• SCCP — Signaling Connection Control Point
• FAS — Frame Alignment Signal
• LD — Laser Diode
• TIFF — Tag Image File Format
• PVC — Permanent Virtual Connection
• O/S — Operating System
• 4GL — Fourth-Generation Language
• DNU — Do Not Use
• NAS — Network-Attached Storage
• HFC — Hybrid Fiber/Coaxial network
• 4 GIG — 4 Giga Intellectual Gadget
• CNG — comfort noise generation
• TOP — technical/office protocol
• CS-PDU — Convergence Sublayer - Protocol Data Unit
• ETF — Early Termination Fee
• ADC — Administration Center
• DAP — Distributed Array Processor
• SDSL — Symmetric Digital Subscriber Line
• MTS — Message Transfer System
• C — Collector
• SDU — Signal Distribution Unit
• CIS — Computer and Information Science
• TTL — ToS and Time-to-Live
• VHSIC — Very High-Speed Integrated Circuit
• KSU — Key Service Unit
• IOC — Inter-Office Channel
• ODS — Operational Data Store (knowledge management)
• CGA — Color Graphics Adapter
• ACSE — Association Control Service Element
• FEA — Finite Element Analysis
• S/D — Source/Drain
• CSC — Common Signaling Channel
• ACC — Area Control Center
• DPCM — differential pulse code modulation

• DACS — Digital Access Cross-connect System
• TSO — Telecommunications Service Order
• WCDMA — Wideband Code Division Multiple Access
• 2G — Second Generation Wireless Systems
• CMIP — Common Management Information Protocol (ATM)
• SFX — Special Effects
• SLIC — Subscriber Line Interface Circuit
• BLER — Block Error Rate
• SM — Service Module
• IV&V — independent verification and validation
• ACP — Access Control Point
• IEEE-SA — Institute of Electrical and Electronics Engineers - Standards Association
• IMAP — Internet Mail Access Protocol
• SWBD — Switchboard
• TAM — Telephone Answering Machine
• SVC — Switched Virtual Circuit (ATM)
• DGPT — Directorate General of Posts and Telecommunications
• EU — End User
• SRM — Scalable Reliable Multicast
• DDU — Disk Drive Unit
• VPA — Valid Peripheral Address
• CFNRY — Call Forwarding on No Reply
• COM — Comedy Central
• NII — National Information Infrastructure (USA)
• TRS — Telecommunications Relay Service
• AP — Action Point
• CAM — Common Access Method
• ESCA — photoelectron spectroscopy for chemical analysis
• OSS — Operations Support System
• SIA — Securities Industry Association
• DFG — difference-frequency generation
• RACH — Random Access Channel
• IPS — Instructions Per Second
• SISIR — Singapore Institute of Standards and Industrial Research
• ASN.1 — Abstract Syntax Notation One
• PIC — Programmable Interrupt Controller
• OXCO — Oven-Controlled Crystal Oscillator
• WAYP — White and Yellow Pages
• ALT — Accelerated Life Test
• LDP — Label Distribution Protocol
• UMA — Unlicensed Mobile Access
• CP — Call Processing
• FEM — Finite Element Method
• SQ — Service Quality
• IPM — Inches Per Minute
• DSI — Digital Speech Interpolation
• OSP — Outside Plant
• RAU — Remote Access Unit
• CODASYL — COnference on DAta SYstems Languages
• CAC — Connection Admission Control (Asynchronous Transfer Mode)

• CLK — Clock
• BA — Behaviour Aggregate
• WSFL — Web Services Flow Language
• RSS — Radio Service Software (Motorola)
• BMS — Business Management System
• EECM — End-to-End Call Manager
• DL — Definition List
• SPIN — Service Provider Identification Number
• ASAR — Advanced Synthetic Aperture Radar 
• HSPA — High Speed Packet Access
• 4G — Fourth Generation Wireless Systems
• DTU — Data Transfer Unit
• MAJ — Major
• PAM — Payload Assist Module
• CE — Channel Element
• SD — Speed Dial
• ASD — Alternative Service Delivery
• DTI — Digital Trunk Interface
• TELNET — Telecommunications Network Protocol
• CPC — Calling Party Control
• ASE — Application Service Element
• SSRC — Synchronization Source
• OSF — Open Software Foundation
• AVR — Automated Voice Response
• IMP — Interface Message Processor
• REA — Rural Electrification Administration (US)
• COO — Cell of Origin
• FGA — Feature Group A
• DRFM — Digital Radio-Frequency Memory
• RDMA — Remote Direct Memory Access
• ARSR — Air Route Surveillance Radar
• IEEE-CS — Institute of Electrical and Electronics Engineers Computer Society
• CCA — Carrier-Controlled Approach
• CS — Central Station
• LFACS — Loop Facility Assignment and Control System
• CALEA — Communications Assistance for Law Enforcement Act
• CGI — Cell Global Identity
• EMR — Electromechanical Relay
• NDS — Novell Directory Services
• MHO — My Humble Opinion
• ABM — Asynchronous Balanced Mode
• CCR — Customer Controlled Reconfiguration (Sprint)
• WSDL — Web Services Description Language
• NCAR — National Center for Atmospheric Research (US)
• VG — Voice Grade
• 3-D — 3-Dimensional
• DM — Differential Mode
• P — Priority
• SSM — Spread Spectrum Modulation
• MH — Message Handler

• CT — Computer Terminal
• OWS — Operator Work Station
• UART — Universal Asynchronous Receiver/Transmitter
• WDN — Wireless Developer Network
• SCU — System Control Unit
• AWT — Agence Wallonne des Télécommunications
• NWK — Network
• FECN — Forward Explicit Congestion Notification (ATM)
• IPLC — International Private Leased Circuit
• LCR — Least Cost Routing
• LDN — Local Directory Number
• ISG — Information Systems Group
• TOMS — Total Ozone Mapping Spectrometer (satellite Instrument)
• VESA — Video Electronics Standards Association
• CLDC — Connected Limited Device Configuration
• TPC — The Phone Company
• MSW — Most Significant Word
• FTNS — Fixed Telecommunications Network Services
• EA — Extended Address Field Bit
• BAN — Building Area Network
• IG — Interface Group
• CTI — Computer Telephony Integration
• BOSS — Binary Object Storage System
• FDD — Frequency Division Duplex
• HTML — Hyper-Text Markup Language
• RNX — Restricted Numeric eXchange
• CLETS — California Law Enforcement Telecommunication System
• CHTML — Compact Hypertext Markup Language
• SRR — Search and Rescue Region
• V — Variable
• NCC — Network Control Center (GSFC)
• RGN — Region
• CGI — Computer Graphics Interface
• ALB — Analog Loopback
• COT — Central Office Terminal
• ST — Such That
• INE — Intelligent Network Element
• FOD — Fax on Demand
• BCDIC — Binary Coded Decimal Interchange Code
• PLL — Phase Locked Loop
• RICK — Repeater Interface Communications Kit
• EGSM — Extended Global System for Mobile Communications
• SCPC — single channel per carrier
• VQV — Voice Quality Value
• SFN — Single Frequency Network
• DCA — Dynamic Channel Assignment
• M/W — MicroWave
• LSW — Least Significant Word
• CND — Calling Number Display
• IRF — Impulse Response Function

• DARTS — Design Approach for Real-Time Systems
• COAM — Customer Owned And Maintained
• SSM — Synchronization Status Message
• ACF — Advanced Communications Function (IBM)
• CCNA — Cisco Certified Network Administrator
• DUV — Deep Ultraviolet
• LRC — Longitudinal Redundancy Check
• NF — Noise Factor
• ECM — Error Correction Model
• SSMA — Spread-Spectrum Multiple Access
• FSK — Frequency Shift Keying
• CPG — Converged Packet Gateway
• LIS — Lightning Imaging Sensor
• MSDP — Multicast Source Discovery Protocol
• PTP — Point To point Protocol
• SN — Stock Number
• CMRS — Commercial Mobile Radio Service
• BHCA — Busy Hour Call Attempts
• CIP — Carrier Identification Parameter
• BSID — Base Station Identity
• # — Number sign, octothorp; special function key
• ATS — Air Traffic Services
• OOK — On/Off Keying
• DIV — Divisionsion
• CSU — Channel Service Unit
• TAX — Trunk Automatic Exchange
• DAC — Digital-To-Analog Converter
• RTC — Real-Time Control
• DDI — Direct Dialing Incoming
• TSP — Telecommunications Service Priority
• CRB — Cramer-Rao Bound
• FXS — Foreign Exchange Subscriber
• TCP/IP — Transmission Control/Internet Protocol
• EVA — Electronic Video Agent
• CIP — Continuous Improvement Program
• RX — Receive
• TDRSS — Tracking and Data Relay Satellite System
• SN — Service Number
• TUR — Trunk Utilization Report
• NTDS — Naval Tactical Data System
• VSAM — Virtual Storage Access Method
• EIR — Excess Information Rate
• DNC — Do Not Call
• CLEC — Competitive Local Exchange Carrier
• DC — Device Control
• CCLC — Carrier Common Line Charge
• RSS — root-sum-square
• PDL — Positioning Data Link
• AAS — advanced automation system (FAA)
• OML — Object Model Library

• ILEC — Incumbent Local Exchange Carrier
• MLA — Modern Language Association
• AAL5 — ATM (Asynchronous Transmission Mode) Adaptation Layer 5
• AMA — automatic message accounting
• ASN.1 — Abstract Syntax Notation 1
• PSN — Packet Switched Network
• UAT — Universal Access Transceiver
• ADCCP — Advanced Data Communication Control Procedures
• TACACS — Terminal Access Controller Access Control System
• CIP — Channel Interface Processor
• MMC — Microsoft Management Console (Microsoft)
• WDA — Wireless Digital Assistant
• DAS — Data Acquisition System
• WE — Western Electric
• DXC — Digital Cross Connect
• FDI — Feeder Distribution Interface
• ELFEXT — Equal-Level Far-End Cross-Talk
• GDK — GIMP (GNU Image Manipulation Program) Drawing Kit
• ESPN — Entertainment and Sports Programming Network
• WTS — Wireless Telecommunications Symposium
• IPR — Intellectual Property Right
• YA — Yet Another
• CNG — Fax Calling Tone
• PNP — Plug-and-Play
• ARM — Asynchronous Response Mode
• EBIC — Electron Beam Induced Current
• MITI — Ministry of International Trade and Industry
• MA — Maintenance Action
• RSL — Restricted Service License
• SS1 — Signalling System 1 (500/20 Hz tones)
• LIF — Logical Interchange Format
• ISI — Intersymbol Interference
• PARC — Palo Alto Research Center
• ET — Electronic Transmission
• MGC — Multimedia Gateway Controller
• MPI — Minimum Picture Interval
• DLL — Digital Local Line
• CAM — Computer-Aided Manufacturing
• VLSI — Very Large-Scale Integration
• DLP — Data Link Processor
• IS 41 — Interim Standard 41 (Inter-Cellular Network Communication Protocol)
• SIMT — Système interbancaire marocain de télécompensation
• LOP-P — Loss Of Pointer - Path
• CV — Coding Violation
• CPE — Customer Premise Equipment
• FNN — Full National Number
• PTO — U.S. Patent And Trademark Office
• SIP — Session Initiation Protocol
• TMSI — Temporary Mobile Subscriber Identity
• FGD — Feature Group D

• PMT — Program Management Team
• 3G — 3rd Generation Wireless Format
• RDBMS — Relational Data Base Management System (Oracle)
• RMON — Remote Monitoring
• TEI — Terminal Endpoint Identifier
• ACA — Adaptive Channel Allocation
• EDFA — Erbium-Doped Fiber Amplifier
• CCITT — Comit? Consultatif International T?l?graphique et T?l?phonique
• FLL — Fixed-Loss Loop
• ANC — Access Network Controller
• MA — Message Analysis
• DOCSIS — Data over Cable Service Interface Specification
• AOS — Alternate Operator Service
• BY — Busy
• DA — deca
• DCF — Distributed Coordination Function
• EDC — Electronic Dispersion Compensator
• PNP — Positive-Negative-Positive
• CDM — Conceptual Data Model
• SETI — Search for Extraterrestrial Intelligence
• LUNT — Line Unit Network Termination
• DMT — Discrete Multi-Tone Technology
• IWF — Interworking Function
• CPH — Call Party Handling
• LRQ — Location Request
• CAMEL — Customized Applications for Mobile-network Enhanced Logic
• B-CPE — Broadband Customer Premises Equipment
• BDE — Borland Database Engine
• MC — Maintenance Control
• DICOM — Digital Imaging and Communications in Medicine
• PIM — Protocol Independent Multicast
• SCCS — Switching Control Center System
• INTELSAT — International Telecommunications Satellite
• SE — Southeast
• L2TP — Layer 2 Tunneling Protocol
• CTIA — Cellular Telecommunications Industry Association
• GRUB — Greedy Reclamation of Unused Bandwidth
• NTE — Network Terminating Equipment
• SR — Slow Release
• VPWS — Virtual Private Wire Service
• F — Frequency
• WARC — World Administrative Radio Conference
• PUC — Public Utility Commission (electricity)
• MSC — Mobile Switching Center
• ETN — Electronic Tandem Network
• HUP — Hook-UP
• EDSX — Electronic Digital Signal Cross-Connect
• LANE — Local Area Network Emulation
• MFLOPS — Millions of Floating Point Operations per Second
• DLCI — data link connection identifier

• WSP — Wireless Service Provider
• FCA — Fixed Channel Allocation
• BOM — Bit-Oriented Message
• ALI — Automatic Location Information
• LP — Line Pair
• GI — Graded-Index
• CRV — Call Reference Value
• CRTS — Cellular Radio Telecommunications Service
• ICL — Inserted Connection Loss
• CAR — committed access rate
• NRP — Network Resource Planning
• LAAS — Local Area Augmentation System
• ILD — International Long Distance
• AWG — arrayed waveguide grating
• VN — Virtual Network
• VTAM — Virtual Telecommunication Access Method
• BSA — Basic Service Area
• TOC — Telecommunication Operations Center
• STU — Secure Telephone Unit
• CLCC — Ceramic Leaded Chip Carrier
• LBR — Low Bit Rate
• SIM — Subscriber Identification Module
• WFA — Wait for Answer
• MTD — Moving Target Detection
• CDV — Cell Delay Variation(ATM)
• DTAP — Direct Transfer Application Process
• CPOP — Circuit Precedence Over Packet data
• DPT — Dynamic Packet Transport
• UBR — Unspecified Bit Rate
• W-CDMA — Wideband Code Division Multiple Access
• DLU — Digital Line Unit
• SSAP — Source Service Access Point
• FTTK — Fibre To The Kerb
• ILETS — International Law Enforcement Telecommunications Seminar
• RXQUAL — Received Signal Quality
• BIND — Berkeley Internet Name Domain
• SCM — Single-Carrier Modulation
• BIS — Brought Into Service
• TDWR — Terminal Doppler Weather Radar
• RADIUS — Remote Authentication dial In User Service
• DTE — Digital Terminal Equipment
• NCP — Network Control Program
• GAN — Global Area Network
• NCF — Network Control Facility
• CIC — Carrier Identification Code
• BUFR — Binary Universal Form for the Representation (of data)
• BSC — Bi-Synchronous Communications
• SNIX — Single Noise Interference Xterminator
• RADINT — Radar Intelligence
• GTP — GPRS (General Packet Radio Service) Tunneling Protocol

• PSO — Professional Services Organization
• REPT — Report
• GRX — GPRS Roaming Exchange
• TLT — Test Loop Translator
• ATSC — Advanced Television Systems Committee
• FOIP — Fax Over Internet Protocol
• URN — Uniform Resource Namespace
• NSAP — Network Service Access Point
• L2F — Layer 2 Forwarding protocol
• LIM — Line Isolation Monitor
• DQDB — Distributed Queue Dual Bus
• PACS — Personal Access Communications System
• CACH — Call Appearance Call Handling
• WTP — Wireless Transaction Protocol
• CSIRO — Commonwealth Scientific and Industrial Research Organization
• SCR — Sustainable Cell Rate
• DXF — Data Exchange Format
• GERAN — GSM (Global System for Mobile communications) Edge Radio Access Network
• NW — North West
• FC — Frame Control
• NE — Network Element
• VCI — Virtual Channel Identifier
• ADPCM — Adaptive Differential Pulse Code Modulation
• 3G — Third Generation (mobile communication system)
• CEPT — Conférence Européenne des Administrations des Postes et des Télécommunications
• MTA — Message Transfer Agents (Internet)
• FAC — Forced Authorization Code
• EMF — Event Management Framework
• ALOC — Average Length Of Call
• SAT — Satellite
• RCU — Radio Control Unit
• BDSL — Broadband Digital Subscriber Line
• ETOC — Electronic Table of Contents
• TACSAT — Tactical Satellite
• SSN — Switched Service Network
• UDP — Up Down Pair
• BAN — Billing Account Number
• LS — Loop Start
• STMR — Sidetone Masking Rating (telecommunications)
• VSAT — Very Small-Aperture Terminal
• MEAS — Measure
• BT — Burst Tolerance
• PD — Pulse Duration
• DPA — Distributed-Power Architecture
• CCCH — Common Control Channel
• ADM — Administration Building
• CES — Circuit Emulation Service
• ULL — Unbundled Local Loop
• BT — Bluetooth Tablet
• MMM — Mobile Media Mode

• * — Star, special function key
• MP — Modulation Parameter
• ECS — Environmental Control System (Subsystem)
• ESN — Electronic Serial Number
• B8ZS — Binary Eight Zero Substitution
• DNSIX — Defense Network Security Information Exchange
• IBSS — Independent Basic Service Set
• GTB — Global Telecom Brokers
• TDR — Time-Domain Reflectometry
• PTT — Push to Talk Technology
• EPP — Enhanced Parallel Port (PC)
• MBE — Molecular Beam Epitaxy
• JISC — Japanese Industrial Standards Committee
• CMA — Communications Management Association
• NT — New Technology, also Windows NT
• STM — Scanning Tunneling Microscopy
• SDHLR — Super-Distributed Home Location Register
• ATS — Abstract Test Suite
• TM — Thematic Mapper (Landsat)
• DDLD — Direct Dial Long Distance
• ADPC — Automatic Data Processing Center
• RTB — Retransmission Buffer
• UTL — Utility
• 3GPP — Third-Generation Partnership Project
• ERL — Echo Return Loss
• DLT — Delete
• BABT — British Approvals Board for Telecommunications
• RCP — Right-Hand Circular Polarization
• 2G — Second generation cellular
• SRL — Singing Return Loss
• IPRC — Intellectual Property Rights Committee
• FPS — Framing Pattern Sequence
• 100VG — 100 Voice Grade (IEEE 802.12 AnyLAN Standard)
• EEROM — Electronically Erasable Read-Only Memory
• COC — Central Office Connection
• SCR — System Change Request
• COFA — Change Of Frame Alignment
• VPX — Virtual Path Cross-Connect
• MMDS — Multichannel Multipoint Distribution Service
• F/W — Firmware
• UPT — Universal Personal Telecommunications
• 3G HSPA — Third-Generation High-Speed Packet Access
• CERN — Conseil Europeen Pour La Recherche Nucleaire
• FCA — Free Carrier Alongside
• LH — Link Handler
• FTS — Federal Telecommunications System
• RIPE NCC — Reseaux IP Europeens Network Coordination Centre
• MTI — Moving Target Indicator
• FTTP — Fiber To The Premises
• ATTRA — Appropriate Technology Transfer for Rural Areas

• RDT — Recall Dial Tone
• RDT — Remote Digital Terminal
• PTT — Push to Talk Testing
• DCAS — Downloadable Conditional Access System
• SCH — Synchronization Channel
• BORSCHT — Battery feed, Overvoltage protection, Ringing, Signaling, Coding, Hybrid, and Testing
• WNMS — Wireless Network Management System
• DSSSL — Document Style Semantics and Specification Language
• IR — International Roaming
• INSAT — Indian National Satellite
• EFCI — Explicit Forward Congestion Indication (ATM)
• FMR — Follow Me Roaming
• NDIS — Network Driver Interface Specification (Microsoft Windows NT)
• HFC — Hybrid Fiber Coaxial
• CPAP — Customer Premises Access Profile
• MSI — Maritime Safety Information
• MR — Mobile Router
• SN — Switching Network
• BAF — Bellcore AMA (Automatic Message Accounting) Format
• MAP — Mobile Application Part
• FIOS — Fiber Optic Services
• DEM — Digital Elevation Model
• ESCON — Enterprise System Connection
• OMF — Object Management Framework
• CAPTAIN — Character And Pattern Telephone Access Information Network
• NTSC — National Television Standards Committee
• CTE — Computer Telephony Engineer
• OMP — Open Management Platform
• PSDN — Public Switched Digital Network
• FFH — Fast Frequency Hopping
• DRQ — Disengage Request
• CON — Concentrator
• TBPS — Terabits Per Second
• EST — Electroshock Therapy
• CBQ — Class-Based Queuing
• FDOA — Frequency Difference Of Arrival
• FAT — Final Acceptance Testing
• ZCZ — Zero Correlation Zone
• CASE — Computer-Aided Software Engineering
• CAAS — Communications-as-a-Service
• DTL — Defense Telephone Link
• LB — Local Battery
• SPE — Synchronous Payload Envelope
• ET — Exchange Terminal
• TCB — Telecommunication Certification Body
• SA — Selective Availability (on GPS transmissions)
• DOD — Direct Outward Dialing
• TDM — Time Division Multiplexing
• MF — Multiple Frequency
• SRA — Seamless Rate Adaptation

• QOI — Quality of Information
• UMTS — Universal Mobile Telecommunications Service
• SINAD — SIgnal-to-(Noise And Distortion) ratio
• TU — Transmission Unit
• PLCP — Physical Layer Convergence Procedure
• ECTF — Enterprise Computer Telephony Forum
• AQP — Association for Quality and Participation
• MFC — Multi-Frequency Code
• SPID — Service Profile Identifier
• DNI — Data Network Interface
• DPBX — Digital Private Branch Exchange
• SMS — Service Management System
• FAW — Frame Alignment Word
• EM — Element Manager
• CSR — Customer Service Request
• DAC — Digital to Analog Converter-Audio
• NEMP — Nuclear Electromagnetic Pulse
• CDA — Communications Decency Act's
• TBCD — Telephony Binary Coded Decimal
• LAPB — Link Access Protocol-Balanced
• DXI — Data Exchange Interface
• ETOM — Enhanced Telecom Operations Map
• OSA — Open System Architecture
• DE — Discard Eligibility (ATM)
• NC — Network Channel
• TCA — Threshold Crossing Alert
• DPNSS — Digital Private Network Signaling System
• OLS — Optical Line System
• LCF — Location Confirm
• BHA — Busy Hour Attempts
• CID — Craft Interface Device
• ATCA — Advanced Telecom Computing Architecture
• NMC — Network Management Center
• PTT — Push to Talk Taster
• EC — Equipment Controller
• CSAR — Combat Search and Rescue
• CCP — Compression Control Protocol
• TD — Transmit Data
• WFT — Wireline Formation Test
• RRC — Root Raised-Cosine
• LCP — Local Control Point
• LLA — Link Level Access
• RFR — Radio Frequency Radiation
• S/N — Signal-to-Noise ratio
• NSE — Network Software Environment
• MPU — Main Processor Unit
• PMOS — P-channel Metal Oxide Semiconductor
• VISSR — visible and infrared spin scan radiometer (GOES)
• UNI — User-Network Interface
• ENV — Environment

• JWP — Joint Working Party
• ALI — Automatic Location Identifier
• LDI — Long Distance Interconnect
• CALS — Computer Aided Acquisition and Logistic Support
• TSC — Test System Controller
• VADB — Virtual Auto Dial Backup
• DBRNC — deciBel Relative to Noise in a Circuit
• TC — Technical Committee (HL7)
• NAP — Network Access Point
• DPDT — Double-Pole Double-Throw
• DDU — Digital Data Unit
• STM — Synchronous Transfer Mode
• EV — electronvolt
• BATM — Basic Telecommunication Access Method
• BNCC — Base Network Control Center
• NAU — Network Addressable Unit
• TD-CDMA — Time Division - Code Division Multiple Access
• ACF — Access Coordination Function
• ETSI — European Telecommunications Standards Institute
• DECT — Digital Enhanced Cordless Telecommunication
• GSTN — General Switched Telephone Network
• APPC — Advanced Program-to Program Communications
• ACU — Automatic Calling Unit
• CDV — Compressed Digital Video
• NICT — National Institute of Information and Communications Technology
• RPCU — Radio Port Control Unit
• BHCC — Busy Hour Call Completions
• TT — Text-Telephone
• UCF — Unregistration Confirm
• DL — Downlink Message
• FRF-LMI — Frame Relay Forum - Local Management Interface
• 3GSM — Third-generation Global System for Mobile (communications)
• PTE — Path Terminating Equipment (SONET)
• DMS — Defense Messaging System
• CSR — Customer Service Report
• ARFA — Allied Radio Frequency Agency
• IPOATM — Internet Protocol over ATM
• WVOIP — Wireless Voice over Internet Protocol
• DIL — Direct Inward Line
• IVP — Integrated Voice Protocol
• MAU — Multistation Access Unit
• 4WA — Four Wire Analog
• WFG — Wireless Firewall Gateway
• FI — Format Identifier
• PSLV — Polar Satellite Launch Vehicle (Indian Space Research Organization; India)
• 4WAI — Four-Wire Analog Interface
• ATU-C — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Central office end
• CFOT — Certified Fiber-Optic Technician
• VSM — Vestigial Sideband Modulation
• PY — person-year

• FIRST — Forum of Incident Response and Security Teams (CERT)
• LORAN — Long Range Aid to Navigation System
• CSDU — Core Service Data Unit
• FIFO — first-in, first-out
• VOB — Voice Over Broadband
• RM-ODP — Reference Model for Open Distributed Processing
• DUN — Dial-Up Networking
• BUS — Broadcast and Unknown Server
• HDTV — High-Definition Television
• CRS — Cell Relay Service
• MGCP — Multimedia Gateway Control Protocol
• LSAP — Link Service Access Point
• NLM — NetWare Loadable Module
• CLD — Cross-Layer Design
• LRM — Long Reach Multimode
• SMS — System Management Server
• MDN — Mobile Directory Number
• RADARSAT — Radar Satellite
• CRBT — Color Ring Back Tone
• LI — Length Indicator
• AIU — Analog Interface Unit
• DPST — Double-Pole Single-Throw
• ATB — Above-Ground Telecommunications Backbone
• CBMS — Computer-Based Message System
• MAG — Mobile Access Gateway
• BCSM — Basic Call State Model
• SEM — Scanning Electron Microscopes
• BTS — Base Transceiver Station (cellular)
• ANT — ADSL Network Terminator
• GMSS — Global Mobile Satellite System
• AIS-L — Alarm Indication Signal - Line
• SMMR — Scanning Multichannel Microwave Radiometer
• CTO — Commonwealth Telecommunications Organisation
• ARD — Automatic Ring Down
• DCS — Defense Communications System
• B-ISDN — Broadband ISDN
• SCO — Synchronous Connection Oriented
• MB — Measured Business
• MVDS — Microwave Video Distribution System
• ARCNET — Attached Resource Computer Network
• DTU — Date/Time Update
• WTNM — Working Telephone Number Management
• AAV — Alternate Access Vendor
• RADSL — Rate Adaptive Digital Subscriber Line
• CDDI — Copper Distributed Data Interface
• LSP — Label Switched Path
• AT — Attenuation
• LCAS — Link Capacity Adjustment Scheme
• ALCAP — Access Link Control Application Protocol
• PMMA — Polymethyl Methacrylate

• TCS — Telephony Control Specification
• STD — Secondary Telecom District
• PDSO — Packet Data Security Overlay
• USF — Universal Service Fund
• PSN — Public Switched Network
• UIT — Union Internationale des Télécommunications
• WIN — Wireless Intelligent Network
• EVC — Electronic Voucher Charging
• LN — Line
• BB — Blackberry
• ARPT — Autorité de Régulation des Postes et Télécommunications
• CC — Composite Clock (SONET)
• TRIG — Trigger
• LMT — Lightwave Microcell Transceiver
• ATRAC — Adaptive Transform Acoustic Coding
• GOMP — Get Off My Phone
• BIC — Bus Interface Controller
• BPSK — Binary Phase-shift Keying
• MTP — Message Transfer Part
• P2P — Person-to-Person
• GS — Ground Start
• USA — Underground Service Alert
• LEED — Low-energy Electron Diffraction
• VNL — Via Net Loss
• PTM — Packet Transport Mode
• AMTFT — Active Matrix Thin Film Transistor
• LSC — Link State Control
• RS-422 — Recommended Standard 422 (ANSI/EIA standard for transmitting serial data)
• SDSL — Symmetrical Digital Subscriber Line
• AGCH — Access Grant Channel
• BTP — Business Telecom Products, Inc.
• SDNS — Secure Data Network System
• DUV — Data-Under-Voice
• MBMS — Multimedia Broadcast/Multicast Service
• VO — Voice Only
• TP — Transition Point
• PHY — Physical Layer
• MIS — Marketing Intelligence System
• DMT — Discrete Multi-Tone
• LOB — Line Of Bearing/Balance
• SGSN — Serving GPRS (General Packet Radio Service) Support Node
• BT — Back Trace
• RLA — Received Level Average
• IDCP — Internet Device Control Protocol
• RDSS — Radio Determination Satellite Service
• FGDC — Federal Geographic Data Committee's
• PMT — Photo Multiplier Tube
• EC-N — Electrical Carrier (n=a number, e.g., EC-4)
• CCSA — Common Control Switching Arrangement
• IDLC — Integrated Digital Loop Carrier

• CLOS — Clear Line Of Sight
• KEK — Key Encrypting Key
• AECT — Association for Educational Communications and Technology's
• TCC — Transmission Control Code
• WAE — Wireless Application Environment
• DTR — Down-Time Ratio
• IMPI — IP (Internet Protocol) Multimedia Private Identity
• BPP — Billed Party Preference
• PJC — Pointer Justification Count
• TP-PMD — Twisted Pair Physical Medium Dependent
• VAN — Value-Added Network
• VOB — Versioned Object Base
• TON — IEEE/ACM Transactions On Networking
• TCM — Time Compression Multiplexer
• VDR — Voice Digitization Rate
• E2E — End-to-End
• DECCO — DISA Defense Commercial Communications Office
• EC — Entropy Coding
• BCS — British Computer Society
• PCS — Personal Communications Services
• ATD — Advanced Technology Demonstration
• ATL — Advanced Technology Laboratory
• CATI — Computer-Assisted Telephone Interviewing
• CDVT — Cell Delay Variation Tolerance
• LCGN — Logical Channel Group Number
• MILNET — Military Network
• SCORM — Shareable Content Object Reference Model
• PCCA — Portable Computer Communications Association
• WSA — Wireless Security Auditor
• DS-3 — Digital Signal, Level 3
• GOSIP — Government Open Systems Interconnection Profile
• LMS — Location and Monitoring Service
• ESM — electronic support measure
• CAS — Column Address Strobe
• GFC — Generic Flow Control (ATM)
• CSTA — Computer Supported Telecommunications Applications
• AAP — Alternate Access Provider
• MMB — Middle Mouse Button
• AFPS — Automatic Facility Protection Switching
• PLE — Path Length Efficiency
• UMTS — Universal Mobile Telecommunication System
• QOTS — Quality Of Telephone Services
• MCR — Minimum Cell Rate (ATM)
• VAD — Voice Activity Detection
• VPC — Virtual Path Connection (ATM)
• SMT — station management (protocol)
• RSN — Regional Service Network
• BWX — Broadband Wireless Exchange
• TPS — Telephone Preference Service
• RP — Radio Port

• NESC — National Electrical Safety Code
• FMS — Fixed Mobile Substitution
• BAP — Bandwidth Allocation Protocol
• PTI — Payload Type Indicator
• CACM — Communications of the ACM
• X — X Window System
• CLP — Cell Loss Priority (ATM)
• CDA — Communications Decency Act of 1996
• SAR — Segmentation and Reassembly (ATM)
• DCMES — Dublin Core Metadata Element Set
• BRAN — Broadband Radio Access Network
• KSPS — KiloSymbols Per Second
• AB — Answer Back
• IDCU — Integrated Digital Carrier Unit
• AFI — Authority and Format Identifier
• GSM — Global System for Mobile telecommunications
• TSDU — Transport Service Data Unit
• N-AMPS — Narrowband Advanced Mobile Phone System
• ANAC — An Automatic Number Announcement Circuit
• IPXCP — Internetwork Packet Exchange Control Protocol
• RNR — Receive Not Ready
• LIDB — Line Information DataBase
• NFR — Near-Field Recording
• AMTI — Airborne Moving Target Indicator
• PSQM — Perceptual Speech Quality Measure
• ADIF — Accounting Data Interchange Format
• BSRF — Basic System Reference Frequency
• DMT — Digital-Discrete Multi-Tone
• BP — Block Parity
• RTC — Right to Carry
• PSK — Phase Shift Key
• IXC — interexchange carrier
• EC — Echo Cancelling
• ADM 3X — DS3 Add-Drop Multiplex
• TP — Telephone Pole
• ZD — Zero Defects
• VNS — Virtual Network System
• NRZ — Nonreturn To Zero
• FEAC — Far End Alarm and Control
• LFTYR — Ley Federal de Telecomunicaciones y Radiodifusión
• LMDS — Local Multipoint Distribution Service
• NPSI — Network Packet Switching Interface
• STA — Science and Technology Agency (Japan)
• GTM — Go to Meeting
• ANS — Advanced Network Services
• CFR-47 — Code of Federal Regulations Title 47 (FCC)
• AAL — ATM (Asynchronous Transmission Mode) Adaptive Layer
• AEA — American Electronics Association's
• FOC — Fiber-Optic Cable
• BDFB — Battery Distribution Feeder Bay

• JSC — Joint Scientific Committee (ICSU, WCRP, and WMO)
• WFA — Work Force Administration
• 3GIP — Third Generation Internet Protocol
• OODBMS — Object-Oriented Database Management Systems
• WIS — WAN (Wide Area Network) Interface Sublayer
• HEC — Header Error Control
• KTS — Key Telephone System
• CCCI — Command, Control, Communications and Intelligence
• CDM — Configuration Data Manager
• QPM — QoS (Quality of Service) Policy Manager
• TNI — Telephone Network Interface
• QS — Quasi-Synchronous
• ECS — Encryption Control Signal
• OSD — Onscreen Display
• IBS — In-Building Solutions
• ACM — Address Complete Message
• RAD — Recorded Announcement Device
• SLIP — Serial Line Internet Protocol
• RLS — Recursive Least Squares
• SMSC — Short Message Service Center
• DMT — Discrete Multi-tone Transmission
• PT — Payload Type (ATM)
• BAOC — Barring of All Outgoing Calls supplementary service
• DCC — Digital Control Channel
• SSP — Security Service Provider
• FLN — Fixed Line Network
• ADTM — Asynchronous Data Transfer Mode
• EC — Enhanced Cellular
• SQL — Specified Quality Level
• P&A — Privacy and Authentication
• CCR — Current Cell Rate (ATMF)
• AAV — Alternative Access Vendor
• HDB3 — High-Density Bipolar Three-bit substitution
• SM OFC — Single-Mode Optical Fiber Cable
• OIM — Operations Interface Module
• DNA — Do Not Answer
• COMB — Combined
• COBE — Corporate Owned Business Only
• FR — Functional Requirement
• DCO — Dial Central Office
• CALA — Customer Address Location Area
• ULP — Upper Layer Protocol
• VOFR — Voice Over Frame Relay
• VR — Virtual Router
• CLF — Carrier Line Failure
• PCIA — Personal Communications Industry Association
• VSC — Vertical Service Code
• A/D — Analog-to-Digital converter
• BCIX — Berlin Commercial Internet Exchange
• SAPI — Service Access Point Identifier

• VCC — Voice Call Continuity
• LTU — Line Terminating Unit
• GLT — Great Lakes Telecom
• EA — expedited acknowledgement
• PFE — Power Feed Equipment
• DSCS — Defense Satellite Communication System
• TSI — time-slot interchange
• AAL2 — ATM (Asynchronous Transmission Mode) Adaptation Layer 2
• DSU — Digital Service Unit
• DOD — Dial on Demand
• FEBE — Far End Block Error (SONET)
• CT — Cordless Telecommunications
• EF&I — Engineering, Furnishing and Installation
• VCT — Variable Cam Timing
• SGCP — Simple Gateway Control Protocol
• MIN — Mobile Identification Number
• BSC — Base Station Controller
• USRT — Universal Synchronous Receiver/Transmitter
• COP — Character Oriented Protocol
• ESG — Enhanced Service Gateway
• RCT — remote Control Terminal
• DPT — Dial Pulse Terminate
• LXT — Local Exchange Terminal
• VLF — Vertical-Laminar-Flow
• MO — Magneto-optic
• CD — Committee Draft
• PTCL — Pakistan Telecommunication Company Ltd
• SDN — Software Defined Network
• BASIZE — Buffer Allocation Size
• ACNA — Access Customer Name Abbreviation
• AI — Adapter Interface
• CDPD — Cellular Digital Packet Data
• PGP — Pretty Good Protection (encryption)
• DF — Direction Finding or Finder
• SS7 — Signaling System 7
• DMNG — Digital Mobile News Gathering
• AVT — Audio Visual Telecommunications
• BSS — Broadband Switching System
• TLP — Transmission Level Point
• DDM — Data Distribution Manager
• ACRE — Authorization and Call Routing Equipment
• PLCP — Physical Layer Convergence Protocol (ATM)
• DE — Discard Eligible
• PNM — Pulse Number Modulation
• TP — Termination Point
• TIMS — Telephone Information Management System
• DTW — Dynamic Time Warping
• XRF — X-Ray Fluorescence
• CIS — Center for Integrated Systems
• SAMI — Structured Adjustment & Maintenance Interface

• DLE — Digital Local Exchange
• Z — Zulu Time
• QPA — Quality Performance Analysis
• BAM — Basic Access Module
• IMTS — Improved Mobile Telephone Service
• CWTS — China Wireless Telecommunication Standard
• MNP — Mobile Number Portability
• CLI — Calling Line Identification
• DDSN — Digital Derived Services Network
• MC/MIC — Mode Common/Mode Indicate Common
• MOS — Metal Oxide Semiconductor (FET Devices)
• UCM — Use Case Map
• FB — Fine Business
• WNAP — Wireless Network Access Point
• HPN — Home Phone Network
• ANSI — Advanced Network Signaling Input
• FUD — Fair Use Doctrine
• TRX — Tandem Repeater eXchange
• SBX — Small Business Exchange
• VC — Virtual Circuit (ATM)
• ITU-T — International Telecommunication Union - Telecommunications section
• OST — Office of Science and Technology
• CM — Connection Manager
• SSU — Synchronization Supply Unit
• INMS — Integrated Network Management System
• ISD — International Subscriber Dialling
• DMI — Desktop Management Interface (computing)
• IOC — Interoffice Channel
• ATU-R — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Remote terminal end
• COI — Community of Interest
• PROV — Provisioning
• CEE — Communaut? Economique Europ?enne
• HU — Hook Up
• CNID — Calling Number Identification Display
• PTT — Post Telegraph and Telecommunications
• BIOS — Basic Input-Output System
• IVN — Interactive Video Network
• USF — Universal Server Farm
• MNOS — Metal-nitride-oxide Semiconductor
• LULT — Line Unit/Line Termination
• BONDING — Bandwidth On Demand Interoperability Group
• LVM — Line Verification Module
• SHR — Self-Healing Ring
• LSI — Large-Scale Integration
• PWM — Pulse width modulation
• AMOLED — Active Matrix Organic Light-Emitting Diode
• DACS — Digital Access and Cross-Connect System
• CDSL — Consumer Digital Subscriber Line
• MEH — Mobile-Executed Handoff
• CD-ROM — Compact Disk-Read-Only Memory

• TRCSL — Telecommunications Regulatory Commission of Sri Lanka
• LAT — Local Area Transport (network)
• DORA — EV-DO (EVolution-Data Optimized) standard Revision A
• DLT — Digital Line Termination
• CMT — Commercial Metering Transponder
• TCL — Transverse Conversion Loss
• LRB — Loop Reverse Battery
• ISSI — Inter-Switching System Interface
• NAM — Number Assignment Module
• LPDP — Local Policy Decision Point
• UNO — Universal Network Operations
• AA — Auto-Answer
• MBS — Maximum Burst Size (ATM)
• LTU — Line Termination Unit
• VLR — Visitor Location Register
• NCOS — Network Class Of Service
• TTC — Telemetry Telecommand and Control
• AEIMP — Apple Event Interprocess Messaging Protocol
• SCC — Specialized Common Carrier
• CSCW — Computer-Supported Cooperative Work
• CSP — Converged Service Platform
• INWATS — INward Wide Area Telecommunications Service
• LSMS — Local Service Management System
• MERIS — medium-resolution imaging spectrometer
• VCA — Voice Connecting Arrangement
• CAN — Controller Area Network
• ACMA — Atlantic Cable Maintenance Agreement
• CD ROM — Compact Disc Read-Only Memory
• CELP — Code Excited Linear Prediction
• WRED — Weighted Random Early Detection
• DCEF — Distributed Cisco Express Forwarding
• AARQ — A-Associate Request
• SMU — Service Management Unit
• CCH — Common Channel Handler
• AIS-V — Alarm Indication Signal - Virtual
• O — objective
• FESS — Flywheel Energy Storage System
• MDCP — Media Device Control Protocol
• WPBX — Wireless Private Branch Exchange
• VCR — Videocassette Recorder
• WATS — Wide Area Telecommunications Service
• NETBIOS — Network Basic Input-Output System
• WDSL — Wireless Digital Subscriber Line
• NICAD — Nickel Cadmium
• MMS — Multimedia Message Service
• ECDIS — Electronic Chart Display Information System
• ESA — Enhanced Subscriber Authentication
• ECC — Emergency Communications Center
• LCU — Lightweight Computer Unit
• ASAS — All-Source Analysis System

• NSN — National Significant Number
• AFRINIC — African Network Information Centre
• SYSADM — System Administrator
• TJB — Telephone Junction Box
• OTF — On-The-Fly (data acquisition method)
• DAF — Directory Access Function
• LCU — Line Control Unit
• ESDS — Electrostatic Discharge Sensitive
• DOV — Data-Over-Voice
• BFS — Broadcast File System
• TACSIM — Tactical Simulation (Simulator)
• DOITT — Department of Information Technology and Telecommunications
• LZ — Lempel-Ziv compression algorithm
• UDT — Unreliable Data Transfer
• HSCSWD — High-Speed Circuit-SWitched Data
• CEPT — Conference of European Posts and Telecommunications
• A/C — Air Conditioner
• AFCEA — Armed Forces Communications and Electronics Association's
• USPI — Universal Serial Phone Interface
• RTFM — Read The Friendly Manual
• DNA — Digital Network Architecture
• DEO — Digital End Office
• CLASS — Cell Level ATM (Asynchronous Transfer Mode) Services Simulator
• SR — Service Request
• FHSS — Frequency Hopping Spread Spectrum
• 802.11 HR — High data Rate IEEE 802.11 Wireless LAN protocol
• INAP — Intelligent Network Application Part
• ATIS — Alliance for Telecommunications Industry Solutions
• FD — Full Duplex
• OCI — object code insertion
• CSL — component sublayer
• ATMS — automatic transmission measuring system
• DS0 — Digital Signal Zero
• CCSS6 — Common Channel Signaling System # 6
• UMTS — Universal Mobile Telecommunications Standard
• SHD — Smart Handheld Device
• AIS-P — Alarm Indication Signal - Path
• RLC — Radio Link Control
• SNI — Service Node Interface
• LRF — Laser Range Finder
• WAAS — Wide Area Augmentation System
• JMA — Japanese Meteorological Agency
• AAS — Automatic Announcement Subsystem
• DMB — Disconnect and Make Busy
• SINS — Ship’s Inertial Navigation System
• RCF — Remote Call Forwarding
• EKTS — Electronic Key Telephone Set
• VFL — Visual Fault Locator
• ATB — All Trunks Busy
• DBN — Dial-Back Number

• ADTS — Ameritech Digital Transport Service
• SPT — System Page Table
• NIMH — Nickel-Metal Hydride
• VGF — Voice Grade Facility
• ALT — Automatic Link Transfer
• GOS — Gerry Otis Simpson
• VDSL — VHBR (Very High Bit Rate) Digital Subscriber Line
• ADM — Administration, Office of
• EGPRS — Enhanced General Packet Radio Service
• NMS — NetWare Management System
• JDC — Japan Digital Cellular
• DACS — Digital Access Carrier System
• CYTA — Cyprus Telecommunications Authority
• SR — Scanning Radiometer
• DBF — Digital Beam-Forming
• MTS — Message Transmission Subsystem
• PVN — Private Virtual Network
• LMU — Line Monitor Unit
• WBMP — Wireless Bitmap
• CFS — Call for Service
• MRCA — Most Recent Common Ancestor
• FPLMTS — Future Public Land Mobile Telecommunications System
• CMAS — Cellular Management System
• D3 — Digital channel bank, Third generation
• UTRAN — UMTS (Universal Mobile Telecommunication System) Terrestrial Radio Access Network
• WAW — Wide Area Wireless
• GOSIP — Government Open System Interconnection Profile
• E — Exchange
• TWX — Teletypewriter Exchange (Telex)
• MITS — Metaphors for Integrated Telecommunications Services
• PM — Processable Mode
• ACEK — Authentication Encryption Key
• TEM — Transmission Electron Microscope
• DCS — Digital Cross-connect Switch
• ISC — International Switching Center
• PTN — Public Telephone Network
• APS — Advanced Power System
• SASL — Simple Authentication and Security Layer
• SNI — Subscriber Network Interface
• APPN — Advanced Peer-to-Peer Network
• RBS — Robbed Bit Signaling
• CCITT — Comite Consultatif International Telegraphique et Telephonique (now ITU-T)
• NMC — Nortel Matra Cellular
• CS — Connection Segment
• SPI — Security Parameters Index
• C² — Command and Control
• NSDI — National Spatial Data Infrastructure
• TSG — Telephone Security Group
• DTS — Digital Terminal Systems
• MEECN — Minimum Essential Emergency Communication Network

• NARC — Non-Automatic Relay Center
• CPT — Cellular Paging Teleservice
• TRAC — Totally Reconfigurable Analog Circuit
• WIVO — WIreless VelOcity
• QOD — Quality of Data
• DS-1 — Digital Signal, Level 1
• DAS — Distributed Antenna System
• TACS — Total Access Cellular System
• TDRS — Tracking and Data Relay Satellites
• RBT — Ring Back Tone
• SCE — Service Creation Environment
• ATIS — Automatic Transmitter Identification System
• BTN — Billing Telephone Number
• WLNP — Wireless Local Number Portability
• IDSL — ISDN (Integrated Services Digital Network) Digital Subscriber Line
• TP — Transaction Processor
• DDS — Dataphone Digital Service (AT&T)
• LEC — Liquid Encapsulated Czochralski
• SIGTRAN — Signaling Transport
• CSP — Continuous Speech Processing
• BTL — Bell Telephone Laboratories, Inc.
• DORK — Disciples Of The Righteous King
• DLC — Digital Leased Circuit
• LQR — Line Quality Report
• SMAS — Service Management System
• BPOP — Building Point of Presence
• ATACS — Army Tactical Communications System
• XWI — XML (extensible markup language) for Wireless Images
• HCV — High Capacity Voice
• MCPC — Multiple Channels Per Carrier
• TASI — Time Assigned Speech Interpolation
• DME — Distributed Management Environment (OSF)
• CVT — Circuit Validation Test
• RYP — Russian Yellow Pages
• TARP — Target Identifier Address Resolution Protocol
• AEE — Agent Execution Environment
• CCS — Common Channel Signaling
• AH — Authentication Header
• CAE — Common Application Environment
• AFIPS — American Federation of Information Processing Societies
• MLHG — Multi-Line Hunt Group
• CPN — Customer Premise Network
• PTM — Point-To-Multipoint
• CP — Cell Phone
• BC — Basic Call
• DTU — Data Terminal Unit
• DACS — Digital Access Cross-Connect Switch
• SCRC — SCCP Routing Control
• MP — Master Processor
• SVI — Service Interception

• BSVCI — Broadcast Signaling Virtual Channel Identifier
• ROSE — Remote Operations Service Element
• WBOK — Wireless Broadband of Oklahoma
• CUG — Closed Users Group
• ASP — Active Signaling Protocol
• ACL — Asynchronous Connection-less Link
• SIO — Service Information Octet
• SVW — Sioux Valley Wireless
• ADC — Advanced Data Control
• EDGE — Enhanced Data for GSM (Global System for Mobile communication) Evolution
• ICLD — Inter-Channel Level Difference
• MMJ — Modified Modular Jack
• MAC — Message Authenticity Check
• DPDCH — Dedicated Physical Data Channel
• JWG — Joint Working Groupof
• WDMW — Web Directory for Mobile and Wireless
• 4G — Fourth Generation
• BOA — Basic Object Adapter
• DSX — Digital Signal Cross-Connect
• 800 — Freephone
• TMTC — Telemetry and Telecommand
• GEO — Geostationary Earth Orbit
• EADAS — Engineering and Administrative Data Acquisition System
• CU — Cooling Unit
• IDD — International Direct Dialing
• ACA — Automatic Circuit Assurance
• CIPOA — Classical Internet Protocol over ATM (Asynchronous Transfer Mode)
• AMP — amplifier / amplification
• TFL — Telecom Fiji Limited
• WAWS — Washington Area Wideband System
• STUN — Simple Traversal of UDP (User Datagram Protocol) through NAT (Network Address Translation)
• TSGR — Transport System Generic Requirements
• D4 — Digital channel bank, Fourth generation
• CQ — Communications Quality
• FOE — Fiber Optic Equipment
• RCMAC — Recent Change Memory Administration Center
• QEDI — Quod Erat Demonstrandum
• VGC — Voice Grade Channel
• CMTS — Cellular Mobile Telephone System
• CCC — Credit Card Calling
• GTXC — Global Telephone Exchange Carrier
• EDT — European Deaf Telephone
• APR — Alarm Processing Remote
• NANP — North American Numbering Plan
• CM — Common Mode
• MOD — Modulo
• ASTE — Advanced Systems and Telecommunications Equipment
• MODEM — modulation and demodulation
• TAE — Terminal Adapter Equipment
• WCMP — Wireless Control Message Protocol

• UIH — Unnumbered Information with Header check
• SOR — Statement of Requirements
• CFNA — Call Forwarding No Answer
• FCFS — First-Come, First-Served
• MAPDU — Management Application Protocol Data Unit
• ABR — Available Bandwidth Rate
• SCMG — SCCP Management
• WGX — Wireless Gateway Switch
• ALC — Automatic Line Controller
• SLIC — Subscriber Loop Interface Circuit
• CCC — CDMA Cluster Controller
• SRU — Search and Rescue Unit
• RTU — Right to Use
• O/G — Outgoing
• CSLIP — Compressed SLIP
• DISA — Direct Inward Switch Access
• IMT-A — International Mobile Telecommunications - Advanced
• CLIP — Caller Line Identification Presentation
• MSG — Management Steering Group
• TPF — Transmission Priority Field
• OID — Object Interaction Diagram
• NF — Not Found
• YIP — Your Internet Phone
• VTA — Vermont Telecommunications Authority
• SS6 — Signalling System 6
• MMC — Minimum Monthly Charge
• TX — Transmit
• RFH — Remote Frame Handler
• ELEC — Enterprise Local Exchange Carrier
• ADTS — Automated Digital Terminal System
• BHP — Burst Header Packet
• SDCCH — Standalone Dedicated Control Channel
• SH — Shell
• WEDE — Wireless Enterprise Delivery Environment
• UIF — User Interface Framework
• SEM — Sionscanning Electron Microscopy
• PRM — Performance Report Message
• TWX — Teletypewriter Exchange Service
• XC — Cross-Connect
• SMLC — Serving Mobile Location Center
• QNC — Quick Net Connect
• C/T — Carrier to Noise Temperature Ratio
• CMS — Conversational Monitor System
• WPC — Wireless Personal Communications
• LQD — Line Quality Disturbance
• ADAD — Automatic Dialing Announcing Device
• WLAP — Wireless LAN (Local Area Network) Access Point
• CSAA — Central Service Area Authority
• WDP — Wireless Datagram Protocol
• ZBTSI — Zero Byte Time Slot Interchange

• IOS — Internet Over Satellite
• ARS — Automatic Route Selection
• BWD — backward
• PNE — Path Number Efficiency
• ISTD — International Subscriber Trunk Dialing
• MFJ — Modified Final Judgement
• CTIT — College of Telecommunications and Information Technology
• PPV — Pay-Per-View
• AC — Absorption Coefficient
• SSU — Stratospheric Sounding Unit (TOVS)
• UPC — Usage Parameter Control
• EMV — EuroPay, MasterCard, Visa
• HUMAN — High-speed Unlicensed Metropolitan Area Network
• TED — Triteal Enterprise Desktop
• RSL — Remote Serial Link