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Computing & IT >> Telecom Abbreviations

Look through 4999 acronyms and abbreviations related to Telecom:

• IPB — Invision Power Board
• XFMR — Transformer
• DDRS — Dynamic Data Rate Selection
• LAN — Local Area Network
• CBCU — Centralized Broadband Control Unit
• EBITDA — Earnings before Interest, Taxes, Depreciation and Amortization
• DCE — Data Circuit-terminating Equipment
• YTD — Year To Date
• ETA — Estimated Time of Arrival
• YMMV — Your Mileage May Vary
• XML — Extensible Markup Language
• DWDM — Dense Wavelength Division Multiplexing
• ECG — Electrocardiogram
• DOE — Distributed Object Environment
• BRDF — Bidirectional Reflectance Distribution Function
• GFSK — Gaussian Frequency Shift Keying
• C3I — Command, Control, Communications & Intelligence
• CSR — Customer Service Representative
• OIC — Oh I See
• URL — Universal Resource Locator
• SYN — Synchronous
• APR — Annual Percentage Rate
• CT — Computed Tomography
• ROM — Read-Only Memory
• RDF — Resource Description Framework
• CSMA/CA — Carrier Sense Multiple Access/Collision Avoidance
• DND — Do Not Disturb
• LASER — Light Amplification By Stimulated Emission Of Radiation (cf. Maser)
• FTP — File Transfer Protocol
• IQ — Intelligence Quotient
• CSMA/CD — Carrier Sense Multiple Access with Collision Detection
• YGWYPF — You Get What You Pay For
• 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
• ASAP — As Soon As Possible (pronounced AY-sap)
• CSMA/CD — Carrier sense multiple access / collision detection
• CONG — Congestion message
• ATM — Automatic Teller Machine
• 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.
• LED — Light-Emitting Diode
• CSMA — Carrier Sense Multiple Access
• X-BAR — Crossbar telephone exchange
• CCTV — Closed-circuit television
• BTW — By The Way
• RAEX — Roaming Agreement EXchange
• MAN — Metropolitan Area Network

• IT — Information Technology
• BPM — Beats Per Minute
• OEM — Original Equipment Manufacturer (usually in reference to car parts)
• THX — Thanks
• S-BCCH — Short Message Service Broadcast Control Channel
• FDIC — Federal Deposit Insurance Corporation
• XA-FR — Exchange Access Frame Relay
• CPU — Central Processing Unit
• S X S — Step-by-Step
• UAX 14 — Unit Automatic eXchange type 14
• ISO — In Search Of
• PPM — parts per million
• X-OFF — Transmitter Off
• CPE — Customer Premises Equipment
• EPA — Environmental Protection Agency (US)
• X-ON — Transmitter On
• IRC — Internet Relay Chat
• TEMIP — Telecommunications Management Information Platform
• MLS — Microwave Landing System
• C4I — Command, Control, Communications, Computers, & Intelligence
• WACN ID — Wide Area Communications Network IDentifier
• POC — Point Of Contact
• SD — Standard Deviation
• ZDBOP — Ziff-Davis Benchmark Operation
• B-ICI — Broadband Inter-Carrier Interface
• C-NBAP — Common Node B Application Part
• A-KEY — Authentication key
• FIFO — First In, First Out
• OC-256 — Optical Carrier Signal, Level 256
• DAM — Diagnostic Acceptability Measure
• COB — close of business (End of duty day)
• E-LEAD — Ear Lead
• PDF — Portable Document Format (created by Adobe Acrobat)
• VIP — Very Important Person
• SABGW — System Architecture Evolution Gateway
• LLC — Limited Liability Company
• PDR — Preliminary Design Review
• F2F — Face To Face (also Meeting In Person)
• NMSE — Normalized Mean Square Error
• I.LINK — IEEE 1394, High Performance Serial Bus, implementation
• FEMA — Federal Emergency Management Agency
• RFQ — Request For Quotation
• M-CSI — Mobility management CAMEL (Customized Applications for Mobile network Enhanced Logic) Subscription Information
• T-IC — T-interConnect
• OC-9 — Optical Carrier Signal, Level 9
• IP — Internet Protocol
• QC — Quality Control
• EAP — Employee Assistance Program
• AUP — Acceptable Use Policy
• OC-18 — Optical Carrier Signal, Level 18

• CDR — Critical Design Review
• D-H — Diffie-Hellman
• ADM — Add-Drop Multiplexer
• ISO — International Organization for Standardization
• VC-ATOD — Virtual Clearinghouse on Alcohol, Tobacco and Other Drugs
• H323 — ANSI standard for format over IP
• D-NBAP — Dedicated Node B Application Part
• RF — Radio Frequency
• T-CARRIER — Trunk Carrier
• PO — Purchase Order
• WTG — Way To Go
• P&L — Profit and Loss statement
• CY — Calendar Year
• DAHDI — Digium/Asterisk Hardware Device Interface
• EDI — Electronic Data Interchange
• ASTM — American Society for Testing and Materials (Philadelphia, Pennsylvania)
• RFP — Request For Proposal
• KBYTE — Kilobyte (103)
• PDT — Pacific Daylight Time
• IRR — Internal Rate of Return
• CU — See You
• ECU — Electronic Control Unit
• LRU — Line Replaceable Unit
• GSM — Global System for Mobile Communications
• VAZO — Violating All-Zero Octet
• CR — Carriage Return
• LCD — Liquid Crystal Display
• ISP — Internet Service Provider
• ACH — Automated Clearing House
• DSC — Differential Scanning Calorimetry
• CCB — Change Control Board
• DWDM — Dense Wavelength-Division Multiplexing
• CEO — Chief Executive Officer
• FET — Field Effect Transistor
• DBORS — Data Base of Records
• ATM — Asynchronous Transfer Mode
• C³CM — Command, Control and Communications Countermeasures
• AFAIK — As Far As I Know
• ATTN — Attention
• AC — Alternating Current
• QFSK — Quadrature Frequency Shift Keying
• WWW — World Wide Web
• WBS — Work Breakdown Structure
• CV — Curriculum Vitae
• RDY — Ready
• VAT — Value Added Tax
• IPO — Initial Public Offering
• TQM — Total Quality Management
• BTU — British Thermal Unit
• AMD — Advanced Micro Devices, Inc. (producer of computer chips)

• ADSL — Asymmetric Digital Subscriber Line
• MOU — Memorandum of Understanding (an MOU between Food & Drug Administratin and a regulatory agency in another country allows mutual recognition of inspections)
• API — Application Programming Interface
• CSA — Canadian Space Agency
• ABC — activity based costing
• WML — Wireless Markup Language
• GUI — Graphical User Interface (goo-ey)
• ABI — Application Binary Interface
• R&D — Research & Development
• SMTP — Simple Mail Transfer Protocol
• EST — Eastern Standard Time
• SAR — Search And Rescue
• GIS — Geographic Information System
• ASCII — American National Standard Code for Information Interchange
• DAC — Discretionary Access Control
• BRB — Be right back
• CUG — Closed User Group
• ASA — American Standards Association
• PDA — Personal Digital Assistant
• EDS — Electronic Data Systems Corporation
• UDP — User Datagram Protocol (FDDI related)
• AIR — Account Information and Refill
• RPI — Retail Price Index
• BVR — Beyond Visual Range
• ASME — American Society of Mechanical Engineers
• IRL — In Real Life
• DOA — dead on arrival
• SLA — Service Level Agreement
• TNYWR — The Number You Will Receive
• MTBF — Mean Time Before Failure
• ESA — European Space Agency
• PUHU — Pick Up Hang Up
• COR — Carrier Operated Relay
• SRAM — Static Random Access Memory (ess-ram)
• AOL — America on line
• NYSE — New York Stock Exchange
• WB — Welcome Back
• CD — Compact Disc
• MRI — Magnetic Resonance Imaging
• EIS — Executive Information System
• SME — Subject Matter Expert
• GATT — General Agreement on Tariffs and Trade (government)
• ATA — Area Transportation Authority
• HTTP — Hypertext Transfer Protocol
• ICT — Information and Communication Technology
• EOM — End Of Message
• RTN — Regional Telecommunication Network
• ACE — Access Control Entry
• GPS — Global Positioning System (ex-NAVSTAR)
• UR — Your

• CGI — Common Gateway Interface
• FAQ — Frequently Asked Questions (sometimes Pronounced Fak)
• PVT — Private
• DFD — Displaced Frame Difference
• JV — Joint Venture
• DBMS — Database Management System
• ACK — ACKnowledgment
• NPV — Net Present Value {economics}
• PCB — printed circuit board
• O&M — Operation and Maintenance
• MOB — Mobile
• EU — European Union (1994; formerly referred to as the EEC or EC)
• MBR — Master Boot Record
• CAE — Computer-Aided Engineering
• SAN — Storage Area Network
• AM — Ante Meridian
• NFS — Network File System
• ATCRBS — Air Traffic Control Radar Beacon System
• CIO — Chief Information Officer
• WWW3 — World Wide Web Consortium
• ACC — Adaptive Cruise Control
• CCSDS — Consultative/Consultative Committee for Space Data Systems
• NPI — New Product Introduction
• ARPA — Advanced Research Projects Agency (made early internet)
• 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.
• VPN — Virtual Private Network (ATM)
• MST — Mountain Standard Time
• AIS — Automated Information System
• CB — Call Back
• CPM — Critical Path Method
• RPM — Revolutions Per Minute, (Rotations Per Minute)
• RFC — Request For Comment
• RAM — random-access memory
• WDM — Wavelength Division Multiplexing (fiber optics)
• CCM — counter-countermeasure
• PSK — phase-shift keying
• FAA — Federal Aviation Administration
• MIS — Management Information System (OSHA)
• NOS — Network Operating System
• IVR — Interactive Voice Response (telephone technology)
• CRT — Cathode Ray Tube (type of TV)
• PDH — Plesiochronous Digital Hierarchy
• COO — Chief Operation Officer
• CPT — Carriage Paid To
• QMS — Quality Management System
• DOD — United States Department of Defense
• PDN — Public Data Network
• TBD — To Be Determined
• WEP — Wired Equivalent Privacy
• DSCP — Differentiated Services Control Point

• EC — European Commission
• SDR — Special Drawing Rights
• MB — Megabyte
• VM — Voice Mail
• SDMA — Space Division Multiple Access
• TTYL — Talk To You Later (Internet Slang)
• AES — Advanced Encryption Standard
• RQMT — Requirement
• GPRS — General Packet Radio Service
• AM — Amplitude Modulation
• CIS — Commonwealth of Independent States
• FX — Foreign Exchange
• RFI — Request For Information. Sales department shorthand. Special priority when use in conjunction with RFN (see below).
• AE — Account Executive
• RDBMS — Relational Database Management System
• IETF — Internet Engineering Task Force
• ACK — Acknowledge (telecommunications; Cf. NAK)
• LRJ — Location Reject
• BIP — Bit-Interleaved Parity
• AATSR — Advanced Along-Track Scanning Radiometer
• DES — Data Encryption Standard
• WAN — Wide Area Network
• SWAG — Scientific Wild Ass Guess
• ADD — Addendum
• CIR — Committed Information Rate (Frame Relay)
• FIPS — Federal Information Processing Standard
• BUR — Bandwidth Usage Redundancy
• EVP — Executive Vice President
• APT — Automatic Picture Transmission
• CS — Computer Science
• SLIP — Serial Line Interface Protocol
• PGP — Pretty Good Privacy (encryption)
• QOS — Quality of Service
• SCC — Standards Council of Canada
• WWW — World Weather Watch
• JIT — Just in time
• FM — frequency modulation
• DB — Decibel
• MMS — Multimedia Messaging Service
• DRAM — Dynamic Random Access Memory (dee-ram) (computing)
• CBT — Computer Based Training
• BSD — Berkeley Software Distribution
• ACM — Association for Computing Machinery
• ALC — Automatic Level Control
• NATO — North Atlantic Treaty Organisation
• SQA — Software Quality Assurance
• SOW — Statement Of Work
• VVX — Voice and Video eXchange
• MTTR — Mean Time To Repair
• DSS — Decision Support System

• NIC — Network Interface Card
• AOA — Angle Of Arrival
• CAD — Computer Aided Designer
• AAC — Advanced Audio Coding
• QA — Center for Quality Assurance in International Education
• EEC — European Economic Community (predecessor of the European Union|EU)
• RM — Regional Manager
• RWR — Radar Warning Receiver
• DDD — Direct Distance Dial
• AGC — Automatic Gain Control
• POP — Point Of Presence (Internet)
• ADR — Address
• AME — Amplitude Modulation Equivalent
• ENIAC — Electronic Numerical Integrator And Computer
• 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
• ACL — Access Control List
• UPS — Ultraviolet Photoelectron Spectroscopy
• Y2K — Year 2000
• DARPA — Defense Advanced Research Projects Agency (US)
• GSA — U.S. General Services Administration
• FAR — Federal Aviation Regulation
• MSN — Microsoft Network
• PNG — Portable Network Graphics (graphic file standard/extension)
• DNS — Domain Name System
• ABET — Accreditation Board for Engineering and Technology, Inc.
• CRM — Customer Relationship Management
• DSA — Digital Signature Algorithm
• STS — Space Transportation System
• SAS — Statistical Analysis System
• UAV — Unmanned Aerial Vehicle
• ROI — Return on Investment
• SCSI — Small Computer System Interface
• NIH — Not Invented Here
• DHCP — Dynamic Host Configuration Protocol
• Q&A — Question & Answer
• ACE — Advanced Computing Environment
• OCR — Optical Character Recognition
• DDL — Data Definition Language
• ACD — Automatic Call Distributor
• BCC — Blind Carbon Copy
• VHF — Very High Frequency
• DMSP — Defense Meteorological Satellite Program (U.S.)
• SDD — Software Design Document
• IRS — U.S. Internal Revenue Service
• DOJ — Department of Justice (US)
• SIC — Standard Industrial Classification (Code)
• AES — Auger Electron Spectroscopy
• RNC — Radio Network Controller
• EBCDIC — Extended Binary Coded Decimal Interchange Code (pronounced Eb-see-dik) (cf. BCD)
• ISDN — Integrated Services Digital Network

• ACO — Additional Call Offering
• ADM — Add/Drop Multiplexer
• TCO — Total Cost of Ownership
• DME — Distance Measuring Equipment
• ATC — Air traffic control
• CDR — Call-Detail Record
• HVAC — Heating, Ventilation, and Air Conditioning
• BR — Branch
• CC — Carbon Copy
• OBO — Or Best Offer
• EFF — Electronic Frontier Foundation
• PRI — Primary Rate Interface (ISDN)
• ECO — Engineering Change Order
• TNSTAAFL — There's No Such Thing As A Free Lunch
• DTE — Data Terminal Equipment
• ABR — Available Bit Rate
• AD — Active Directory
• CFO — Communication Filing Officer
• 100BASE-T2 — 100 Megabits per Second, Baseband, Two-pair Category 3 UTP cables
• CAM — computer aided manufacturing
• DC — Direct Current
• CTD — Cumulative Trauma Disorder
• CAUCE — Coalition Against Unsolicited Commercial Email
• FFT — Fast Fourier Transform
• TNX — Thanks
• CDT — Central Daylight Time
• PM — Preventive Maintenance
• MDF — Main Distribution Frame
• EW — Electronic Warfare
• EMG — Electromyogram
• PC — Personal computer (host)
• NEC — National Electrical Code
• DFS — Distributed File System
• AQL — Acceptable Quality Level
• RM — Resource Management
• HSD — High Speed Data
• RAID — Redundant Array of Inexpensive Disks
• JAXA — Japan Aerospace Exploration Agency
• ASR — Airport Surveillance Radar
• ADPE — Automatic Data Processing Equipment
• AC — Access Control
• DNS — Domain Name Service
• OMG — Object Management Group
• PERT — Program Evaluation and Review Technique
• DSL — Digital Subscriber Line
• CU — Control Unit
• DLR — Design Layout Record
• IM — Instant Message
• ERP — Enterprise Resource Planning
• VIRUS — Vital Information Resources Under Siege

• ASP — Application Service Provider
• RACON — Radar Beacon
• BBS — Bulletin Board System
• CMI — Computer Managed Instruction
• CMM — Capability Maturity Model
• AAAI — American Association for Artificial Intelligence's
• SBU — Strategic Business Units
• TCP — Transmission Control Protocol
• LEO — Low Earth Orbit (satellite communications)
• BST — British Summer Time
• EFT — Electronic Funds Transfer
• NIST — National Institute of Standards and Technology
• AVHRR — Advanced Very High Resolution Radiometer  
• ZIP — Zone Improvement Plan
• SEI — Software Engineering Institute
• EDVAC — Electronic Discrete Variable Automatic Computer
• EDT — Eastern Daylight Time
• CMS — Content Management System
• DLL — Dynamic Link Library (computer file)
• ATM — Adobe Type Manager
• VR — Virtual Reality
• TCB — Trusted Computing Base
• DDE — Dynamic Data Exchange (in software parlance)
• ASK — amplitude shift keying
• DTX — Discontinuous Transmission
• VTC — Video Teleconference
• RPC — Remote Procedure Call
• CFE — Contractor-Furnished Equipment
• ITU — International Telecommunication Union
• ISAKMP — Internet Security Association and Key Management Protocol
• CHAP — Challenge Handshake Authentication Protocol (ATM)
• 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
• EAP — Extensible Authentication Protocol
• DQE — Detective Quantum Efficiency
• UHF — Ultra High Frequency (300-3000 MHz; 1m-10cm)
• UI — User Interface
• RU — Are You?
• MLS — Multiple Listing Service
• CAA — Civil Aviation Authority
• UTC — Coordinated Universal Time
• NSF — National Sanitation Foundation
• SOHO — Small Office Home Office
• AGP — Accelerated Graphics Port
• CST — Central Standard Time (UTC-6 Hours)
• RFO — Reason For Outage
• LED — law enforcement desk; light emitting diode
• SMS — Short Message Service
• USB — Universal Serial Bus
• AF — Audio Frequency
• SQL — Structured Query Language

• I/O — Input/Output
• ISRO — Indian Space Research Organisation
• ATS — applications technology satellite
• CM — Configuration Management
• ROFL — Rolling on the floor laughing
• USD — United States Dollar
• MRC — Monthly Recurring Charge
• SAIC — Science Applications International Corporation
• BPR — Business Process Re-engineering
• AAAS — American Association for the Advancement of Science
• AT&T — American Telephone and Telegraph (U.S. company, also known as "Ma Bell")
• CRL — Certificate Revocation List
• CCIS — Common Channel Interoffice Signaling
• FCC — Federal Communications Commission (US)
• QI — Quality Improvement
• HZ — cycles per second (hertz)
• TC — Telephone Call
• DQPSK — Differential Quadrature Phase-Shift Keying
• AE — Application Entity
• ROS — Return on Sales
• DSTE — Digital Subscriber Terminal Equipment
• ERT — Emergency Response Team
• SLF — Super Low Frequency
• ARP — Address Resolution Protocol (ATM)
• NMR — Nuclear Magnetic Resonance
• MDA — Monochrome Display Adapter
• SCM — Supply Chain Management
• CLI — Command line Interface (Cabletron)
• ATN — Aeronautical Telecommunication Network
• APIC — Advanced Programmable Interrupt Controller
• EEG — Electro-EncephaloGram
• SP — Service Provider
• AADC — Automated Area Distribution Center
• BECN — Backward Explicit Congestion Notification
• WYSIWYG — What You See Is What You Get (pronounced Wizzy-wig. See Entry For Derived Acronyms)
• ATF — Advanced Tactical Fighter
• W3C — World Wide Web Consortium
• B3ZS — bipolar 3-zero substitution
• PMA — Physical Medium Attachment
• PECVD — Plasma-Enhanced Chemical Vapor Deposition
• CIM — Common Information Model
• B2B — Business to Businesse
• PAR — Precision Approach Radar
• OSHA — Occupational Safety and Health Act (1970)
• FDDI — Fiber Distributed Data Interface
• UN — United Narions
• SBC — Southwestern Bell Corporation
• OSI — Open Systems Interconnection (iso Standard)
• BCD — Binary-Coded Decimal
• SIG — Special Interest Group

• CRC — Contrôle de Redondance Cyclique (French: Cyclic Redundancy Check)
• COQ — Cost Of Quality
• SGML — Standard Generalized Markup Language
• NSA — National Security Agency
• IP — Intellectual Property
• AP — Application Protocol
• FCA — Free Carrier
• BRI — Basic Rate Interface
• TV — Television
• DOS — Disk Operating System
• PE — Polyethylene
• WIPO — World Intellectual Property Organization
• AEC — Architecture, Engineering, Construction
• PPB — parts per billion (109)
• AFC — Automatic Frequency Control
• PLD — Programmable Logic Device
• MAC — Message Authentication Code
• NEMA — National Electric Manufacturer's Association
• EPR — Ethylene-Propylene Rubber
• AMT — Amount
• M — Meter
• NTIS — National Technical Information Service Technology Administration
• BER — Bit-Error Rate
• SXS — Step-By-Step
• RFI — Radio Frequency Interference
• HDML — Handheld Device Markup Language
• CW — Continuous Wave
• PM — Project Manager
• SVP — Senior Vice President
• DCN — Design Change Notification
• AWG — American Wire Gauge
• OSS — Operational Support System
• CBC — cipher block chaining
• ISBN — International Standard Book Number (ISO 2108)
• NOAA — National Oceanic and Atmospheric Administration (US)
• EDP — Electronic Data Processing Plc (London Stock Exchange [LSE])
• AT — Advanced Technology
• IMEI — International Mobile Equipment Identity
• AT&T — American Telephone & Telegraph
• ADT — Abstract Data Type
• MHS — Message Handling System (electronic)
• OFC — Office
• GRE — Generic Routing Encapsulation
• EOT — End Of Transmission
• NTIA — National Telecommunications and Information Administration
• NMT — Nordic Mobile Telephone
• DMTS — Distinguished Member Of Technical Staff
• CIA — Central Intelligence Agency
• PWD — Password
• EGA — Enhanced Graphics Adapter

• STP — standard temperature and pressure (0° and 1 atm)
• PT — Project Team
• ERP — Enterprise Resource Management
• TOS — Type Of Service
• ICMP — Internet Control Message Protocol
• CIC — Circuit Identification Code
• ISSN — International Standard Serial Number (ISO 3297)
• TAC — Technical Assistance Center
• BT — British Telecommunications
• LF — Low Frequency
• WMO — World Meteorological Organization (ICSU)
• EEPROM — Electrically Erasable Programmable Read-Only Memory
• IANA — Internet Assigned Numbers Authority
• KISS — Keep It Simple Stupid
• LCP — Link Control Protocol
• ISS — International Space Station
• PST — Pacific Standard Time (UTC-8 Hours)
• SAE — Society of Automotive Engineers
• VAC — Vacant
• TCP/IP — transmission control protocol/internet protocol
• MF — Medium Frequency
• NA — Not Applicable
• Z — Zero
• WLTF — Wireless LAN (Local Area Network) Task Force
• DTI — Department of Trade and Industry (UK)
• OS — Operating System
• CORBA — Common Object Request Broker Architecture
• SPC — Stored Program Control
• HSDPA — High-Speed Downlink Packet Access
• FCS — Frame check sequence (Ethernet)
• RCU — Remote Control Unit
• ADF — Automatic Direction Finder
• JIS — Japanese Industrial Standard
• SPC — Statistical Process Control. Forerunning quality theory from the 1960s to TQC and TQM.
• MMU — Memory Management Unit
• JPEG — Joint Photographic Experts Group (24-bit image storage format)
• PDU — Protocol data unit (such as segment, packet, frame, etc.)
• DLC — Digital Loop Carrier
• DIT — Directory Information Tree
• PM — post meridian
• TPDU — Transport Protocol Data Unit
• ITSEC — Information Technology Security Evaluation Criteria
• AMI — Advanced Metering Infrastructure
• BS — Base Station
• JPL — Jet Propulsion Laboratory (California Institute of Technology) (NASA)
• URI — Uniform Resource Identifier
• ACFQ — Absence Compensation Fair Queuing
• ISO — Infrared Space Observatory
• LP — Low Pressure
• CUL — See You Later

• ARA — Apple Remote Access
• FASB — Financial Accounting Standards Board
• DCOM — Distributed Component Object Model
• FCW — Federal Computer Week
• BBU — Baseband Unit
• RDP — Radar Data Processing
• ADT — Atlantic Daylight Time (UTC-3 Hours)
• ASQC — American Society for Quality Control's
• WAFB — Wireless Absolute Fairness Bound
• MOS — Model Output Statistics
• KHZ — kilohertz (1000 cycles per second)
• ACTV — Active
• DCE — Distributed Computing Environment
• AS — Autonomous System
• SIL — Speech Interference Level
• QAM — quadrature amplitude modulation
• AXE 10 — Series of electronic telephone exchanges from L.M. Ericsson
• OSPF — Open Shortest Path First (ATM)
• CDMA — Code Division Multiple Access (voice/data transmission)
• DMA — direct memory access (computer term)
• UAS — Unavailable Seconds
• PABX — private automatic branch exchange (telephone)
• C4 — Command, Control, Communications, and Computers
• BPS — bits per second
• MIC — Message Integrity Check
• LMS — Learning management system
• RIP — Routing Information Protocol
• BSOD — Blue Screen Of Death
• PSTN — Public Switched Telephone Network
• MIME — Multipurpose Internet Mail Extension
• SHA — Secure Hash Algorithm
• SNMP — Simple Network Management Protocol (ATM)
• EISA — Extended Industry Standard Architecture
• DSA — Directory System Agent
• JSC — Johnson Space Center (Houston, TX)
• PLMN — Public Land Mobile Network
• VB — Visual Basic
• BIS — Bureau of Indian Standards
• MS — Message Store
• T&C — Terms & Conditions
• MS — Mobile Station
• WTO — World Trade Organisation
• ELF — Extremely Low Frequency
• RFD — Request For Discussion
• RACF — Resource Access Control Facility
• CERT — Computer Emergency Response Team
• RTU — Remote Terminal Unit
• CFD — computational fluid dynamics
• DUP — Duplicate
• DOM — Document Object Model

• CAM — Computer-Aided Mapping
• AVL — Available
• DSSS — Direct Sequence Spread Spectrum
• HDLC — High-Level Data Link Control
• SSL — Secure Socket Layer
• ECP — Engineering Change Proposals
• PBX — Private Branch eXchange (company phone system)
• DT — DWDM (Dense Wavelength Division Multiplexing) Terminal
• CIM — Corporate Information Management
• BPRZ — Bipolar Return-to-Zero
• FTTB — Fiber To The Building
• CATV — Cable Television
• HTTPS — HyperText Transfer Protocol Secure
• MS — Millisecond
• RCC — Rescue Coordination Center
• RAD — Rapid Application Development
• GB — Gigabyte
• IW — Information Warfare
• LEC — Local Exchange Carrier
• IEC — International Electrotechnical Commission
• NAFTA — North American Free Trade Agreement
• EDD — Envelope Delay Distortion
• NIST — National Institute of Standards & Technology (US)
• NESDIS — National Environmental Satellite, Data, and Information Service
• DMX — De-MultipleXer
• DNIS — Dialed Number Identification Service
• DSP — Digital Signal Processor
• VDS — Variable Depth Sonar
• ME — Mobile Equipment
• RSVD — Reserved
• KM — Knowledge Management
• BNSC — British National Space Centre
• IMPACT — Integrated Manufacturing Precision Assembly Cellular Technology
• ASEAN — Association of South East Asian Nations
• ADN — Advanced Digital Network
• PDS — Protected Distribution System
• IRLAN — Infrared LAN
• NAS — Network Access Server
• PPP — Point-to-Point Protocol
• NRC — National Research Council (Canada)
• LCN — Logical Channel Number
• HW — Hardware
• PIN — Personal Identification Number
• TLS — Transport Layer Security
• NBS — National Bureau of Standards (US)
• RMS — root mean square (preferred over "RMS")
• ICANN — Internet Corporation for Assigned Names and Numbers
• CCSD — command communications service designator; control communications service designator
• DPC — Destination Point Code
• YP — Yellow Pages

• AT — Access Tandem
• APPL — Application
• B2C — Business-to-Consumer
• BJT — Bipolar Junction Transistor
• D-RAM — Dynamic Random Access Memory
• LLC — Logical Link Control
• HF — High Frequency
• DTR — Data Terminal Ready
• CG — Coast Guard
• CDS — Cell Directory Service
• CGI — Computer-Generated Imagery
• TM — Technical Manual
• WAP — Wireless Application Protocol
• MVS — Multiple Virtual Storage
• VOL — Volume
• APC — American Power Conversion
• ECE — Economische Commissie voor Europa (United Nations) (Dutch: Economic Commission for Europe)
• RFS — Request For Service
• ELINT — Electronic Intelligence Satellite
• SML/SMS — Service Management Layer/Service Management Service
• FC — Fibre Channel
• OM — Old Man
• LF — Line Feed
• IS — Intermediate System
• STM — Short Term Memory
• NCSA — National Center for Supercomputing Applications
• EAI — Enterprise Application Integration
• MS — Management System
• ISAS — Institute of Space and Astronautical Sciences (Japan)
• USGS — United States Geological Survey (DOI)
• AMI — Alternate Mark Inversion
• MIPS — Millions of Instructions Per Second
• OMS — Optical Multiplex Section
• 3G — Third Generation mobile phone network
• CATV — Community Antenna Television
• SEM — Space Environment Monitor
• ADC — Analog-Digital Converter
• EMS — Express Mail Service
• ECN — Explicit Congestion Notification
• SNR — Signal-to-Noise Ratio
• CS — Cable Select
• CFA — Carrier Facility Assignment
• SCADA — Supervisory Control And Data Aquisition
• STI — Speech Transmission Index
• DASD — Direct Access Storage Device
• EMC — Electromagnetic Compatibility
• SSM — Source-Specific Multicast
• ECMA — European Computer Manufacturer's Association
• SIT — Static Induction Transistor
• PRF — Pulse Repetition Frequency

• CMP — Connection Management Protocol
• AR — Access Rate
• ECR — Electronic Cash Register
• CES — Consumer Electronics Show
• PAN — Personal Area Network
• MCSD — Microsoft Certified Solution Developer
• PAL — Programmable Array Logic
• CLNP — ConnectionLess-mode Network Protocol
• ASQ — Alpha System Qualification
• CA — Certificate Authority
• COO — Cost of Ownership
• VM — Virtual Machine
• IRS — Interface Requirements Specification
• CBDS — Connectionless Broadband Data Service
• BYOD — Bring Your Own Device
• TB — Terabyte
• ASI — Asynchronous Serial Interface
• ARPU — Average Revenue Per User
• AML — Amplitude Modulated Link
• IS — International Standard
• RH — Relative Humidity
• CC — Call Control
• VLF — Very Low Frequency
• 1000BASE-T — 1000 Megabits per Second, Baseband, Twisted Pair
• PCI — Peripheral Component Interconnect
• CRIS — Carrier Route Information System
• PVC — Permanent Virtual Circuit (ATM)
• CO — Certificate of Origin
• CEV — Controlled Environment Vault
• DIBL — Drain-induced Barrier Lowering
• TS — Technical Specification
• WB — Write Back
• ACR — Attenuation Crosstalk Ratio
• IPX — Internetwork Packet Exchange
• DAP — Directory Access Protocol
• WMAN — Wireless Metropolitan Area Network
• LPE — Liquid Phase Epitaxy
• SVC — Scalable Video Coding
• OTN — Optical Transport Network
• MAC — Media Access Control
• BUS — Business
• NLMS — Normalized Least Mean Square
• FCA — Free Carrier Absorption
• MHS — Microwave Humidity Sounder
• CIS — CompuServe Information Service
• NIC — Network Information Center
• DCS — Digital Cross-connect System
• CHF — Swiss Franc
• COM — Component Object Model
• CIFS — Common Internet File System

• STA — State
• DSN — Deep Space Network - network of large antennas and communication facilities.
• BGP — Border Gateway Protocol (routing protocol)
• CG — Center of Gravity (DXS)
• RTS — Request To Send
• MDA — Model Driven Architecture
• BRA — Basic Rate Access
• AIS — Alarm Indication Signal
• TG — Task Group
• MIB — Management Information Base (ATM)
• CABS — Carrier Access Billing System
• ZIP — Zone Information Protocol
• CRO — Central Records Office
• VOD — Video On Demand
• VOIP — Voice Over IP (Internet Protocol)
• RAN — Radio Access Network
• AU — Audio Unit
• LD — Long Distance
• TTYL — Type To You Later
• ISA — Industry Standard Architecture
• NCS — National Communications System
• TAG — Technical Advisory Group for Biological Control Agents of Weeds
• CSO — Customer Service Operations
• WG — Working Group
• ISI — Inter-Symbol Interference
• OLE — Object Linking and Embedding (Microsoft communication protocol)
• UPS — Uninterruptible Power Supply
• COMJAM — Communications Jamming
• WS — Workstation
• IIS — Internet Information Services
• FTTH — Fiber To The Home
• RSVP — Resource Reservation Protocol (Internet)
• LLU — Local Loop Unbundling
• YL — Young Lady
• FR — Frame Relay
• PAP — Password Authentication Protocol (ATM)
• LSR — Local Service Request
• SCTP — Stream Control Transmission Protocol
• ROTFL — Roll On The Floor Laughing
• CAB — Conformity Assessment Body
• CCTA — Central Computer and Telecommunications Agency
• TE — Traffic Engineering
• CF — Compact Flash
• ATSR — Along-Track Scanning Radiometer
• DS — Digital Signal
• ESTEC — European Space Research and Technology Centre
• FAX — Facsimile
• LDAP — Lightweight Directory Access Protocol (pronounced Ell-dap)
• PD — Public Domain
• UAN — Universal Access Number

• OAS — Organization of American States
• IDT — Integrated Digital Terminal
• NOTAM — Notice to Airmen
• RSN — Real Soon Now [which may be a long time coming]
• MTSO — Mobile Telephone Switching Office
• MPI — Message Passing Interface
• ECT — Explicit Call Transfer
• MBPS — Megabits per second
• RCV — Receive
• EPR — Electron Paramagnetic Resonance
• HSS — Home Subscriber Server
• BT — BlueTooth
• ASR — Automatic Speech Recognition
• E — Energy
• CMD — Command
• EMR — Electromagnetic Radiation
• DA — Destination Address
• AFS — Andrew File System
• SA — Scientific American
• NIS — Network Information Service
• DC — Disconnected
• MSU — Microwave Sounding Unit
• CAV — Constant Angular Velocity
• DIS — Distributed Interactive Simulation
• ACT — ACTIVITY, ACTIVITIES
• SOGA — Share of Gross Adds
• MGMT — Management
• VLL — Virtual Leased Line
• VCC — Virtual Channel Connection (ATM)
• F — Fellow
• NTFS — New Technology File System
• SDH — Synchronous Digital Hierarchy (ATM)
• ADCCP — Advanced Data Communications Control Procedures
• JST — Japan Standard Time
• SOAP — Simple Object Access Protocol
• CAD — Computer-Aided Design
• SPI — Service Provider Interface
• IN — Intelligent Network
• UA — User Agent
• TEC — Total Electron Content
• APS — Automatic Protection Switching (SONET/SDH)
• AMHS — Automated Message Handling System
• PET — positron emission tomography
• SW — South West
• MCU — Multipoint Control Unit
• WPAN — Wireless Personal Area Network
• MC — Message Center
• NLM — National Library of Medicine (National Institutes of Health)
• AYT — Are You There
• AEW — Airborne Early Warning

• STP — Spanning Tree Protocol
• ASIC — application-specific integration circuit
• DUC — Digital Up-Converter
• MPLS — Multi Protocol Label Switching
• BPDU — Bridge Protocol Data Unit
• ANI — Automatic Number Identification (Caller ID)
• GDS — Global Distribution System
• AMLCD — Active Matrix Liquid Crystal Display
• SM — Senior Member
• ES — Errored Second
• AFSK — Audio Frequency Shift Keying
• MCD — Magnetic Circular Dichroism
• NI — Network Interface
• NOC — Network Operations Center
• FA — Functional Area
• MME — Mobility Management Entity
• TOP — Technical Office Protocol
• CRBT — Caller Ring Back Tone
• CAC — Carrier Access Code
• SKU — Stockkeeping Unit
• FXO — Foreign Exchange Office
• TBD — To Be Decided
• LPC — Linear Predictive Coding
• BLOS — Beyond Line-Of-Sight
• LZ — Landing Zone
• SVD — Singular Value Decomposition
• ACPI — Advanced Configuration and Power Interface
• CAN — Campus Area Network
• BIOS — Basic Input Output System
• PDN — Packet Data Network
• FAT — File Allocation Table
• GOS — Grade Of Service
• FCP — Fibre Channel Protocol
• AOI — Area Of Interest
• EEA — European Economic Area
• CBP — Coded Block Pattern
• TCSEC — Trusted Computer System Evaluation Criteria
• ITT — Invitation To Tender
• BOC — Bell Operating Company
• EPABX — Electronic Private Automatic Branch Exchange
• VOP — Voice Over Packet
• YYP — Yahoo Yellow Pages
• PCMCIA — Personal Computer Memory Card International Association
• CTS — Clear To Send
• IRDA — Infrared Data Association
• DRM — Digital Rights Management
• PGA — Programmable Gate Array
• JVM — Java Virtual Machine
• EOB — End Of Business
• DOT — Department of Telecommunications (India)

• STP — Signal Transfer Point
• EC — European Community
• CBEMA — Computer & Business Equipment Manufacturers Association
• SLP — Service Location Protocol
• VOC — Volatile Organic Compounds (air pollution)
• POTS — Plain Old Telephone Service (FCW)
• ESS — Electronic Switching System
• CGM — Computer Graphics Metafile
• ARINC — Aeronautical Radio Incorporated
• MD — Mediation Device
• ARIN — American Registry for Internet Numbers
• RSRQ — Reference Signal Received Quality
• CCD — Charge Coupled Device - a device for the movement of electrical charge.
• CMC — Career Management Center
• DCP — Design Change Package
• RDF — Radio Direction Finder
• DDS — Digital Data Service
• UL — Uplink
• ADEOS — ADvanced Earth Observing Satellite (Japan)
• AFP — AppleTalk Filing Protocol
• CT — Computer Telephony
• EAC — Engineering Accreditation Commission
• PKI — Public Key Infrastructure (cryptography)
• WPM — speech--words per minute
• EAS — Extended Area Service
• RARP — Reverse Address Resolution Protocol
• AIFF — Audio Interchange File Format
• ASR — Access Service Request
• SAR — Specific Absorption Rate
• ADL — Advanced Distributed Learning
• P — Predicted
• BG — Background
• YAHOO — You Are Hazy Over Oranges
• BS — Beam Splitter
• BOFH — Bastard Operator From Hell
• OTS — Optical Transmission Section
• PPARC — Particle Physics and Astronomy Research Council
• BACP — Bandwidth Allocation Control Protocol
• DID — direct inward dial
• DCMI — Dublin Core Metadata Initiative (Online Computer Library Center)
• FUP — Fair Use Policy
• HTML — Hyper Text Markup Language
• CSPRM — Common Signaling Protocols Resource Module
• SHF — Super High Frequency
• VXML — Voice eXtensible Markup Language
• APM — Advanced Power Management
• CICS — Customer Information Control System (IBM Mainframe Software; Kicks Or C-I-C-S)
• OSTP — Office of Science and Technology Policy
• IP — Intelligent Peripheral
• MSR — Microwave Scanning Radiometer

• CMT — Cadmium Mercury Telluride
• MTU — Maximum Transmission Unit
• OAM&P — Operations, Administration, Maintenance & Provisioning
• 100BASE-T4 — 100 Megabits per Second, Baseband, Four-pair Category 3 UTP cables
• RRN — Routing Recording Number
• SCP — Service Control Point
• VAS — Value Added Services
• RJ-14 — Registered Jack type 14 (2-wire connector)
• STK — Satellite Tool Kit
• ESF — Edge Spread Function
• TN — Telephone Number
• MP — Multilink Protocol
• WLAN — Wireless Local Area Network
• DX — Duplex
• BERT — Bit Error Rate Tester (telecommunication)
• OLAP — Online Analytical Processing
• IMSI — International Mobile Subscriber Identity
• MSE — Mobile Subscriber Equipment
• NMS — Network Management System
• M — Management
• SPADATS — Space Detection And Tracking System
• SEC — Software Engineering Center
• MCA — Micro Channel Architecture
• DMARC — Demarcation point
• ROSAT — Roentgen Satellite
• RCS — Radar Cross Section
• TO — Technical Order
• FITS — Flexible Image Transport System
• NIMBY — Not In My Back Yard
• AAS — Adaptive Antenna System
• OC — Optical Carrier
• DBS — Direct Broadcast Satellite
• TWT — Traveling Wave Tube
• UML — Unified Modeling Language (Object Management Group, OMG)
• ECAC — European Civil Aviation Conference
• ADF — automatic document feeder
• CFD — Call For Discussion
• ADP — Automatic Data Processor
• CDA — Command and Data Acquisition
• 100BASE-T — 100 Megabits per second, Baseband, Twisted pair
• TOS — Temporarily Out of Service
• SPA — Special Prorate Agreement
• PSD — Phase-Sensitive Detector
• ARQ — Automatic Repeat-reQuest
• MPEG — Motion Picture Experts Group
• TLC — The Learning Channel
• CD — Critical Dimension
• IMC — Intermediate Metal Conduit
• CSAT — Customer Satisfaction
• PCM — Pulse-Code Modulation

• SBC — Session Border Controller
• PUK — PIN (Personal Identification Number) Unlocking Key
• DVP — Digital Voice Privacy
• TRM — Technical Reference Model
• NNTP — Network News Transfer Protocol
• HDSL — High-bit-rate Digital Subscriber Line
• KB — Kilobyte: One thousand and twenty-four bytes kbps kilo bit per second
• AFM — Atomic Force Microscopy
• VGA — Video Graphics Array
• BIP — Band Interleaved by Pixel
• COAX — Coaxial
• PDC — Personal Digital Cellular
• STN — Station Casinos, Inc.
• CFV — Call For Vote(s)
• ARPANET — ARPA Network
• LEP — Large Electron Positron
• RA — Risk Analysis
• PUB — Publication (file name extension)
• OPC — Originating Point Code
• AAF — Advanced Authoring Format
• ECPA — Electronic Communications Privacy Act 1986
• DID — data item description
• ASTD — American Society of Training and Development (Alexandria, Virginia)
• WWAN — Wireless Wide Area Network
• WPS — Wireless Priority Service
• VBR — Variable Bit Rate (ATM)
• SAN — System Area Network
• IS — Information System
• IV — Initialization Vector
• SATAN — Security Administrator Tool for Analyzing Networks
• Y — Yttrium
• RT — Remote Terminal
• AUD — Audit
• CU — Channel Unit
• ECM — Electronic Counter Measures
• ELT — Emergency Locator Transmitter
• MCC — Mission Control Center (JSC)
• SVC — Switched Virtual Connection
• PIM — Personal Information Manager
• EHF — Extremely High Frequency
• B-ISDN — Broadband Integrated Services Digital Network
• TIA — Telecommunications Industry Association
• RSS — Really Simple Syndication
• BSA — Business Software Alliance
• LEN — Line Equipment Number
• QPSK — aeronautical quadrature phase shift keying
• VC — Virtual Channel
• MIT — Massachusetts Institute of Technology (U.S.)
• BCH — Binary Coded Hexadecimal
• EX — Exercise

• EIP — Equipment installation procedure
• FE — Far End
• LU — Logical Unit
• EFS — Encrypting File System
• ITP — Interactive Telecommunications Program
• DEC — Decimal
• GHZ — Gigahertz
• ODBC — Open Database Connectivity
• 2W — Two Wire
• FR PVC — Frame Relay Permanent Virtual Connection
• AIN — Advanced Intelligent Network
• NFPA — National Fire Protection Association
• E&M — ear and mouth (special signaling leads)
• TEL — Telephone
• 9 — Nine
• SD — Software Development
• ARC — Army Reuse Center
• DAL — Dedicated Access Line
• PDS — Planetary Data System
• FAA — Federal Aviation Agency
• NNM — Network Node Manager
• WINS — Windows Internet Name Service
• ECP — Encryption Control Protocol
• KDC — Kerberos Key Distribution Center
• SDLC — Synchronous Data Link Control
• 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)
• SRS — Software Requirements Specifications
• RT — Radiotelephone
• BER — Basic Encoding Rules (ASN.1)
• RJ-25 — Registered Jack type 25 (6-wire connector)
• DSLAM — Digital Subscriber Line Access Multiplexer (Module)
• MOL — Manned Orbiting Laboratory
• TE — Terminal Equipment
• ETS — European Telecommunication Standard
• ASARS — Advanced Synthetic Aperture Radar System
• CPS — Cycles Per Second (now Hertz)
• ACT — Activity
• EGP — Exterior Gateway Protocol
• TCR — Temperature Coefficient of Resistance
• DTD — Document Type Definition (XML)
• DDN — U.S. Defense Data Network
• DL — Digital Library
• MOD — Modify
• RP — Reference Point
• OD — Outside Diameter
• SPGA — Staggered Pin Grid Array
• NIC — Network Interface Controller
• TI — Time Interval
• TDMA — Time Division Multiple Access
• ATA — Analog Telephone Adapter

• CER — Cell Error Ratio
• E — Echo Time Zone
• TE — Test Equipment
• DCS — Digital Cross-Connect
• CNM — Customer Network Management
• IRS — Inertial Reference System
• VSAT — Very Small Aperture Terminal (satellite service)
• BIU — Bus Interface Unit
• Y — Yes
• FSK — Frequency-Shift Keying
• JCL — Job Control Language
• DID — Digital Information Display
• NSAI — National Standards Authority of Ireland
• CO — Central Office
• 911 — Emergency Services Phone Number
• DDCMP — Digital Data Communications Message Protocol
• ARG — Argument
• CBR — Constant Bit Rate
• MEID — Mobile Equipment Identifier
• SDK — Software Development Kit (Microsoft)
• SML — Service Management Layer
• SUS — Suspension
• TOA — Time Of Arrival
• CAPS — Call Attempts Per Second
• GDM — GSM (Global System for Mobile communications) Data Module
• TTY — Teletype Telex Machine
• RT — Response Time
• MMSI — Maritime Mobile Service Identity
• 10BASE-T — 10 Megabits per second, Baseband, Twisted pair
• FE — Finite Element
• ACF — Access Control Field
• OTA — Office of Technology Assessment (U.S.; abolished by Congress, Fall 1995)
• ABN — Abnormal
• DAT — Digital Audio Tape
• VLSI — Very-Large-Scale Integration
• SCN — Switched Circuit Network
• METRO — Metropolitan
• SDM — Service Delivery Management
• AWACS — Airborne Warning And Control System
• POE — power over ethernetinjector
• FWA — Fixed Wireless Access
• ATC — Advanced Technology Center
• BOD — Bandwidth on Demand
• PTA — Pakistan Telecommunication Authority
• TELECOMMUTE — Telecommuting
• ORB — Object Request Broker
• SL — Single Line
• APN — An Access Point Name
• ACAP — Application Configuration Access Protocol
• NOAO — National Optical Astronomy Observatories (Tucson, AZ)

• COMDEX — Computer Dealers Exposition
• TDM — Time Division Multiplexer
• BTC — Botswana Telecommunications Corporation
• IESG — Internet Engineering Steering Group
• AM — Activity Manager
• EIGRP — Enhanced Interior Gateway Routing Protocol
• VMS — Virtual Memory System
• LRC — Learning Resource Center
• NE — North-East
• EMS — Element Management System (ATM)
• SLAM — Scanning Laser Acoustic Microscope
• MIS — Management Information Service
• CB — Common Battery
• EMS — Enhanced Messaging Service
• LQR — Linear Quadratic Regulator
• CTU — Central Terminal Unit
• LIU — Line Interface Unit
• NCSC — National Computer Security Center (NSA)
• DII — Defense Information Infrastructure
• NTP — Network Time Protocol
• CCNA — Cisco Certified Network Associated
• ADT — American District Telegraph Company
• BAN — Base Area Network
• IRQ — Interrupt Request
• BHCA — Busy Hour Call Attempt
• EMCON — Electromagnetic Emission Control
• TCPA — Telephone Consumer Protection Act
• Q — Quadrature
• NCP — Network Control Protocol
• DCS — Digital Cellular System
• COMINT — Communications Intelligence
• NES — Network Encryption System
• WORM — Write-Once, Read-Many
• ISOC — Internet Society
• B3G — Beyond Third Generation
• FEP — Front End Processor
• VBA — Visual BASIC for Applications
• ATS — Automatic Transfer Switch
• VT — Virtual Terminal
• AP — access point
• RMI — Remote Method Invocation
• COPS — Common Open Policy Service
• MX — Mixer
• WAIS — Wide Area Information Server
• DIS — Draft International Standard
• DPL — Digital Power Line
• DSN — Defense Switched Network
• TSR — Telecommunications Service Request
• PEM — Privacy-Enhanced Mail
• UP — User Profile

• HEHO — Head End Hop Off
• CDC — Connected Device Configuration
• PIC — Peripheral Interface Controller
• SF — Single Frequency
• DTMF — Dual-Tone MultiFrequency
• CDE — Common Desktop Environment
• BS — Broadcast Satellite
• HEX — Hexadecimal (base 16)
• DC — Display Controller
• AAV — Accountholder Authentication Value
• SAR — synthetic aperture radar (satellite)
• A — Anode
• PS — Product Specification
• ACLR — Adjacent Channel Leakage Ratio
• TKIP — Temporal Key Integrity Protocol
• PVD — Physical Vapor Deposition
• IEEE — Institute of Electrical and Electronics Engineers
• SPA — Software Publishers Association
• KAK — Key-Auto-Key
• BIS — Business Information System
• SMB — Server Message Block
• SPM — Scanning Probe Microscope
• LT — Less Than
• NPA — Numbering Plan Area
• AN — Access Node
• DCN — Disconnect
• ADB — Apple Desktop Bus
• 3GPP — Third Generation Partnership Project
• TDOA — Time Difference Of Arrival
• AMPS — Advanced Mobile Phone System
• DNIC — Data Network Identification Code
• EIA — Extended Interaction Amplifier
• OCC — Occupancy
• TCM — Trellis-Coded Modulation
• E — Echo
• AMSS — Automatic Message Switching System
• B6ZS — Bipolar 6 Zero Substitution
• CPS — characters per second
• FSAI — Fiber Serving Area Interface
• QDR — Quad Data Rate
• OMA — Open Mobile Alliance
• DM — Domain Model
• TXM — Transmission X-ray Microscope
• RLU — Remote Line Unit
• LNP — Local Number Portability
• CAM — Content Addressable Memory
• TTY — teletype terminal
• PMP — Project Management Professional
• JTF — Joint Task Force
• FDL — Facility Data Link

• PE — Probable Error
• DCE — Data Communication Equipment
• IAB — Internet Architecture Board
• DL — Data Link
• PM — Phase Modulation
• PROM — Programmable Read-Only Memory
• BSS — Base Station Subsystem
• ASDE — Airport Surface Detection Equipment
• B2B — Business-to-Business
• CPN — Cisco Powered Network
• EFIS — Electronic Flight Information System
• DEMUX — Demultiplexer
• TLK — Talk
• OT — Office of Telecommunications
• SA — Source Address
• JRE — Java Runtime Environment
• TDD — Time Division Duplex
• BTAM — Basic Telecommunications Access Method
• SOS — Save Our Souls (Help!)
• TRLR — Trailer
• CQA — Certified Quality Auditor
• CSA — Canadian Standards Association (like UL)
• AIT — Automatic Identification Technology
• AS — Access System
• TOVS — TIROS Operational Vertical Sounder
• VF — Voice Frequency
• BSS — Basic Service Set
• ISO — Independent System Operator (US) (see also TSO) Responsible for grid management, but does not own assets. (electricity)
• MLP — Mobile Location Protocol
• VT — Vacuum Tube
• ES — Emergency Service
• CS — Convergence Sublayer (ATM)
• 4W — Four-Wire
• CPC — Continous Packet Compression
• DPL — Digital Private-Line
• RQMTS — Requirements
• CI — Common Interface
• AMR — Automated meter reading also known as Automatic Meter Reading
• FEP — Front-End Processor
• 2W — 2-Wire
• FEC — Forward Error Correction
• FMC — Fixed Mobile Convergence "Mobile UC or Unified Communications over Wireless"
• DSS — Digital Signature Standard
• RADIUS — Remote Authentication Dial-In User Service
• VOA — Voice Of America
• LISP — List Processing Language
• BBM — Blackberry Messenger
• PC — Peripheral Controller
• SIM — Subscriber Identity Module
• SWAP — Shared Wireless Access Protocol

• SITA — Société Internationale de Télécommunications Aéronautiques
• PP — Polypropylene
• EMEA — Europe, Middle East and Africa
• DN — Distinguished Name
• DMS — Data Management System
• QI — Quality Indicator
• C — Cost
• ESP — Encapsulating Security Payload
• EST — Establish
• JAN — Joint Army-Navy
• NIU — Network Interface Unit
• TCIC — Trunk Circuit Identification Code
• PG — Page
• AFOSR — Air Force Office Of Scientific Research(USA)
• CODEC — Coder/decoder
• NA — Network Adapter
• DUA — Directory User Agent
• ISM — Industrial, Scientific and Medical
• SDP — Software Development Plan
• RAU — Radio Access Unit (Army)
• OSCAR — Orbiting Satellite Carrying Amateur Radio
• IT — Integration Test
• JDK — Java Development Kit
• NSS — Network Switching Subsystem
• SPD — Serial Presence Detect
• NAT — Network Address Translation
• VPI — Virtual Path Identifier
• IAT — Integrated Access Terminal
• TRMM — Tropical Rainfall Measuring Mission (US-Japan)
• DS-0 — Digital Signal, Level 0
• SAS — Special Access Surcharge
• FLM — First Line Maintenance
• FH — Frequency Hopping
• LAG — Link Aggregation Group
• MBWA — Mobile Broadband Wireless Access
• TDD — Telecommunications Device for the Deaf
• MDM — Mobile Device Management
• TC — Transmission Convergence (ATM)
• DDL — Digital Data Link
• CVR — Crystal Video Receiver
• PTP — Point to Point Transmission Service (electricity)
• SZ — Seizure
• PU — Physical Unit (IBM)
• FRS — Frame Relay Service
• CGA — Carrier Group Alarm
• TMS — Time Management System
• CAMA — Centralized Automatic Message Accounting
• TTY — Text Teletype
• SAI — Serving Area Interface
• LQC — Line Quality Control

• DER — Distinguished Encoding Rules
• BSI — British Standards Institution
• ASA — Acoustical Society of America
• LATA — Local Access and Transport Area
• CIAC — Computer Incident Advisory Capability
• SONET — Synchronous Optical Network
• SMR — Specialized Mobile Radio
• FRS — Family Radio Service
• IRTF — Internet Research Task Force
• NRPB — National Radiological Protection Board
• DVB — Digital Video Broadcasting
• ADN — Abbreviated Dialing Number
• DMI — Distributed Management Interface
• TSB — Telecommunication Standardization Bureau
• HLR — Home Location Register
• CSPDN — Circuit Switched Public Data Network
• VRML — Virtual Reality Modeling Language
• EM — Electromigration
• SB — Switchboard
• SG — Signaling Gateway (IETF)
• TL1 — Transaction Language 1
• DPSK — Differential Phase Shift Keying
• SNA — System Network Architecture
• TFTP — Trivial File Transfer Protocol (ATM)
• AUI — Attachment Unit Interface
• IPS — InPlane Switching
• BNC — Bayonet Neill-Concelman
• DDD — Direct Distance Dialing
• MSRN — Mobile Station Roaming Number
• MIDP — Mobile Information Device Profile
• RDI — Remote Defect Indicator (UNI Fault Management)
• CCIR — International Radio Consultative Committee (French Acronym)
• AMPS — Advanced Mobile Phone Service (cellular phone standard)
• MAI — Multiple Access Interference
• CB — Citizens' Band
• OOP — Object-Oriented Programming
• RDS — Rate Determining Step
• EIR — Equipment Identity Register
• PDT — Portable Data Terminal
• AC — Area Code
• CAL — Calorie
• DCS — Data Collection System (NOAA Polar Orbiting Satellites)
• ER — Extended Range
• FTAM — File Transfer Access and Management
• CP — Change Proposal
• DW — Deep Water
• BS — Backing Store
• SIL — Solid Immersion Lens
• GBT — Ground Based Tower
• XPS — X-Ray Photoelectron Spectroscopy

• EMI — Electro-Magnetic Interference
• PSS — Performance Support System
• CAP — Capability
• CIRC — Cross-Interleaved Reed-Solomon Code
• CRLF — Carriage-Return Line-Feed
• LSF — Line Spread Function
• BMEWS — Ballistic Missile Early Warning System (bee-mews)
• EULA — End User License Agreement (usually in reference to software)
• SLV — Satellite-Launch Vehicle
• PBT — Polybutylene Terephthalate
• DVMRP — Distance Vector Multicast Routing Protocol
• PCI — Personal Computer Interface
• SYM — Symmetric
• TSE — Toronto Stock Exchange
• NDVI — Normalized Difference Vegetation Index
• AIF — Audio Interchange Format
• IRC — International Record Carrier
• FOSE — Federal Office Systems Exposition
• DISN — Defense Information Systems Network
• IDF — Independent Distribution Frame
• STD — Subscriber Trunk Dialing
• RMS — Resource Management System
• SDP — Session Description Protocol
• WHT — Walsh-Hadamard Transform
• DII — Dynamic Invocation Interface
• FRAD — Frame Relay Access Device
• MV — Motion Vector
• WTLS — Wireless Transport Layer Security
• E — Electra
• YABA — Yet Another Bloody Acronym
• TAD — Telephone Answering Device
• ACE — Adaptive Communication Environment
• IEC — Interexchange Carrier
• WWAN — wireless wide-area network
• CONUS — Contiguous United States
• DISA — U.S. Defense Information Systems Agency
• SPX — Sequenced Packet Exchange
• RISC — Reduced Instruction Set Computing
• ETSI — European Telecommunications Standard Institute
• CMOS — Complementary Metal Oxide Semiconductors
• OBC — Onboard Computer
• RJE — Remote Job Entry
• CBWFQ — Class Based Weighted Fair Queueing
• VLAN — Virtual Local Area Network
• IAD — Integrated Access Device
• LSI — Large Scale Integration -> VLSI
• LASA — Large Aperture Seismic Array
• RPV — Remotely Piloted Vehicle
• NREN — National Research and Education Network
• FEXT — Far-End Cross Talk

• DPDU — Data Protocol Data Unit
• APDU — Application Protocol Data Units
• CGSA — Cellular Geographic Service Area
• SMDS — Switched Multimegabit Data Service (ATM)
• FDTD — Finite Difference Time Domain
• HSCSD — High-Speed Circuit-Switched Data
• GMRS — General Mobile Radio Service
• SIL — Silence
• L2TPV3 — Layer 2 Tunneling Protocol Version 3
• NAK — Negative Acknowledge
• LD — Laser Diode
• PVC — Permanent Virtual Connection
• FAS — Frame Alignment Signal
• VTS — Vessel Traffic Service
• FITL — Fiber-In-The-Loop
• BCH — Bose-Chaudhuri-Hocquenghem Coding
• SDU — Signal Distribution Unit
• SMI — Structure of Management Information
• T — Temperature
• EBCDIC — Extended Binary-Coded Decimal Interchange Code
• CIS — Computer and Information Science
• IOC — Inter-Office Channel
• TIFF — Tag Image File Format
• LPD — Low Probability of Detection
• CGA — Color Graphics Adapter
• POP — Post Office Protocol
• HFC — Hybrid Fiber/Coaxial network
• TRS — Trunked Radio Systems
• O/S — Operating System
• SDSL — Symmetric Digital Subscriber Line
• NAS — Network-Attached Storage
• MTS — Message Transfer System
• ETF — Early Termination Fee
• 1FB — Single line, Flat Business rate;
• ADC — Administration Center
• C — Collector
• ESF — Extended Super Frame (ATM)
• ASYNC — Asynchronous
• SLIC — Subscriber Line Interface Circuit
• MUSIC — MUltiple SIgnal Classification
• ACSE — Association Control Service Element
• LT — Line Termination
• S/D — Source/Drain
• STN — Station
• SM — Service Module
• IPCP — Internet Protocol Control Protocol
• ODS — Operational Data Store (knowledge management)
• ADC — Access Deficit Charge
• CS-PDU — Convergence Sublayer - Protocol Data Unit
• 4 GIG — 4 Giga Intellectual Gadget

• FTTC — Fiber To The Curb光纤到路边
• SRM — Scalable Reliable Multicast
• ACC — Area Control Center
• MLM — Multi-Longitudinal Mode
• WCDMA — Wideband Code Division Multiple Access
• EU — End User
• SVC — Switched Virtual Circuit (ATM)
• SIA — Securities Industry Association
• FEA — Finite Element Analysis
• IV&V — independent verification and validation
• MCP — Microsoft Certified Professional
• LOO — Likelihood of Occurrence
• 4GL — Fourth-Generation Language
• CMIP — Common Management Information Protocol (ATM)
• CSC — Common Signaling Channel
• TRS — Telecommunications Relay Service
• IPVX — Internet Protocol version X
• IPS — Instructions Per Second
• ACP — Access Control Point
• GBPS — Gigabits per second
• DAP — Distributed Array Processor
• RCC — Radio Common Carrier
• WK — Week
• GSM — Groupe Speciale Mobile
• ALT — Accelerated Life Test
• SAF — System Access Fee
• CP — Call Processing
• 1-ESS — x-ESS series of Electronic Switching Systems
• CAVE — Cellular Authentication and Voice Encryption Algorithm
• OSS — Operations Support System
• COM — Comedy Central
• AF — Assured Forwarding
• RACH — Random Access Channel
• CAM — Common Access Method
• BLER — Block Error Rate
• TSO — Telecommunications Service Order
• SPIN — Service Provider Identification Number
• DGPT — Directorate General of Posts and Telecommunications
• BSS — Base Station System
• TOP — technical/office protocol
• BMS — Business Management System
• DHD — Dial Home Device
• BELLCORE — Bell Communications Research, Inc.
• RSS — Radio Service Software (Motorola)
• PAM — Payload Assist Module
• SMPTE — Society of Motion Picture and Television Engineers, Inc.
• DTN — Data Transfer Network
• SD — Speed Dial
• FMS — Fraud Management System
• TTL — ToS and Time-to-Live

• CVD — Chemical Vapor Deposition
• NII — National Information Infrastructure (USA)
• UMA — Unlicensed Mobile Access
• BA — Behaviour Aggregate
• ROW — Rest Of World
• ESCA — photoelectron spectroscopy for chemical analysis
• OXCO — Oven-Controlled Crystal Oscillator
• DSCP — Differentiated Services Code Point
• VHSIC — Very High-Speed Integrated Circuit
• VPA — Valid Peripheral Address
• 4G — Fourth Generation Wireless Systems
• DACS — Digital Access Cross-connect System
• EECM — End-to-End Call Manager
• VG — Voice Grade
• DPCM — differential pulse code modulation
• PIC — Programmable Interrupt Controller
• AP — Action Point
• CLK — Clock
• COO — Cell of Origin
• SWBD — Switchboard
• SSRC — Synchronization Source
• SQ — Service Quality
• CNG — comfort noise generation
• WAR — Weekly Activity Report
• CC — Country Code
• DDU — Disk Drive Unit
• UTP — unshielded twisted pair
• HSPA — High Speed Packet Access
• DTU — Data Transfer Unit
• CE — Channel Element
• FGA — Feature Group A
• NTU — Network Termination Unit
• TAM — Telephone Answering Machine
• DTI — Digital Trunk Interface
• ASN.1 — Abstract Syntax Notation One
• LR-WPAN — Low-Rate Wireless Personal Area Network
• OSF — Open Software Foundation
• ANSI-41 — ANSI standard for mobile management
• RECON — Reconnaissance
• ASAR — Advanced Synthetic Aperture Radar 
• SCU — System Control Unit
• DSI — Digital Speech Interpolation
• DL — Definition List
• OTDOA — Observed Time Difference of Arrival
• AVR — Automated Voice Response
• IMP — Interface Message Processor
• IEEE-SA — Institute of Electrical and Electronics Engineers - Standards Association
• ASD — Alternative Service Delivery
• ASE — Application Service Element
• WAYP — White and Yellow Pages

• UART — Universal Asynchronous Receiver/Transmitter
• TELNET — Telecommunications Network Protocol
• IMAP — Internet Mail Access Protocol
• WDN — Wireless Developer Network
• MAJ — Major
• WSDL — Web Services Description Language
• CGI — Cell Global Identity
• EBS — Electron Bombarded Silicon
• P — Priority
• RNX — Restricted Numeric eXchange
• ABM — Asynchronous Balanced Mode
• LFACS — Loop Facility Assignment and Control System
• ABBR — Abbreviation
• DRFM — Digital Radio-Frequency Memory
• VESA — Video Electronics Standards Association
• KSU — Key Service Unit
• SSM — Spread Spectrum Modulation
• CAC — Connection Admission Control (Asynchronous Transfer Mode)
• V — Variable
• FDD — Frequency Division Duplex
• CS — Central Station
• OSP — Outside Plant
• SFX — Special Effects
• MHO — My Humble Opinion
• ARSR — Air Route Surveillance Radar
• RAU — Remote Access Unit
• CLDC — Connected Limited Device Configuration
• CT — Computer Terminal
• IPM — Inches Per Minute
• CFNRY — Call Forwarding on No Reply
• SISIR — Singapore Institute of Standards and Industrial Research
• 2G — Second Generation Wireless Systems
• NCC — Network Control Center (GSFC)
• LDN — Local Directory Number
• ISG — Information Systems Group
• BOSS — Binary Object Storage System
• REA — Rural Electrification Administration (US)
• SSM — Synchronization Status Message
• TOMS — Total Ozone Mapping Spectrometer (satellite Instrument)
• CTI — Computer Telephony Integration
• ALB — Analog Loopback
• AWT — Agence Wallonne des Télécommunications
• LRC — Longitudinal Redundancy Check
• LDP — Label Distribution Protocol
• SRR — Search and Rescue Region
• MH — Message Handler
• MSW — Most Significant Word
• SN — Stock Number
• DFG — difference-frequency generation
• CND — Calling Number Display

• EMR — Electromechanical Relay
• BAN — Building Area Network
• PLL — Phase Locked Loop
• TUR — Trunk Utilization Report
• IEEE-CS — Institute of Electrical and Electronics Engineers Computer Society
• LCR — Least Cost Routing
• HTML — Hyper-Text Markup Language
• NF — Noise Factor
• NDS — Novell Directory Services
• LIS — Lightning Imaging Sensor
• CHTML — Compact Hypertext Markup Language
• FXS — Foreign Exchange Subscriber
• ECM — Error Correction Model
• CLETS — California Law Enforcement Telecommunication System
• ST — Such That
• SN — Service Number
• EA — Extended Address Field Bit
• SCPC — single channel per carrier
• IRF — Impulse Response Function
• VSAM — Virtual Storage Access Method
• UAT — Universal Access Transceiver
• RDMA — Remote Direct Memory Access
• RICK — Repeater Interface Communications Kit
• WE — Western Electric
• TAX — Trunk Automatic Exchange
• RTC — Real-Time Control
• FOD — Fax on Demand
• CIP — Carrier Identification Parameter
• DCA — Dynamic Channel Assignment
• TSP — Telecommunications Service Priority
• IG — Interface Group
• 3-D — 3-Dimensional
• FECN — Forward Explicit Congestion Notification (ATM)
• CPG — Converged Packet Gateway
• DC — Device Control
• CGI — Computer Graphics Interface
• RGN — Region
• MSDP — Multicast Source Discovery Protocol
• TDRSS — Tracking and Data Relay Satellite System
• OML — Object Model Library
• RSS — root-sum-square
• PTP — Point To point Protocol
• PDL — Positioning Data Link
• CALEA — Communications Assistance for Law Enforcement Act
• CCR — Customer Controlled Reconfiguration (Sprint)
• RX — Receive
• AAS — advanced automation system (FAA)
• ACF — Advanced Communications Function (IBM)
• NWK — Network
• FSK — Frequency Shift Keying

• TCP/IP — Transmission Control/Internet Protocol
• FDI — Feeder Distribution Interface
• WSFL — Web Services Flow Language
• CCNA — Cisco Certified Network Administrator
• CODASYL — COnference on DAta SYstems Languages
• CRB — Cramer-Rao Bound
• ISMI — International mobile subscriber identity
• DLP — Data Link Processor
• DDI — Direct Dialing Incoming
• CSU — Channel Service Unit
• COT — Central Office Terminal
• DAC — Digital-To-Analog Converter
• CMRS — Commercial Mobile Radio Service
• PARC — Palo Alto Research Center
• CIP — Channel Interface Processor
• SIMT — Système interbancaire marocain de télécompensation
• ET — Electronic Transmission
• ILEC — Incumbent Local Exchange Carrier
• ADCCP — Advanced Data Communication Control Procedures
• MITI — Ministry of International Trade and Industry
• MA — Maintenance Action
• NTDS — Naval Tactical Data System
• DIV — Divisionsion
• LIF — Logical Interchange Format
• WTS — Wireless Telecommunications Symposium
• LSW — Least Significant Word
• IPLC — International Private Leased Circuit
• MPI — Minimum Picture Interval
• DFE — Design For Environment
• MRT — Medical Response Team
• SSMA — Spread-Spectrum Multiple Access
• MMC — Microsoft Management Console (Microsoft)
• PNP — Plug-and-Play
• SIP — Session Initiation Protocol
• ASN.1 — Abstract Syntax Notation 1
• NCAR — National Center for Atmospheric Research (US)
• EVA — Electronic Video Agent
• RSL — Restricted Service License
• CCITT — Comit? Consultatif International T?l?graphique et T?l?phonique
• ARM — Asynchronous Response Mode
• WDA — Wireless Digital Assistant
• RMON — Remote Monitoring
• EBIC — Electron Beam Induced Current
• CNG — Fax Calling Tone
• TEI — Terminal Endpoint Identifier
• FGD — Feature Group D
• DUV — Deep Ultraviolet
• 3G — 3rd Generation Wireless Format
• DM — Differential Mode
• DNU — Do Not Use

• FEM — Finite Element Method
• CPH — Call Party Handling
• ACA — Adaptive Channel Allocation
• SCCP — Signalling Connection Control Part
• ISI — Intersymbol Interference
• PSN — Packet Switched Network
• MGC — Multimedia Gateway Controller
• AOS — Alternate Operator Service
• SETI — Search for Extraterrestrial Intelligence
• RDBMS — Relational Data Base Management System (Oracle)
• DARTS — Design Approach for Real-Time Systems
• PMT — Program Management Team
• INE — Intelligent Network Element
• EDFA — Erbium-Doped Fiber Amplifier
• BCDIC — Binary Coded Decimal Interchange Code
• CDM — Conceptual Data Model
• TACACS — Terminal Access Controller Access Control System
• EGSM — Extended Global System for Mobile Communications
• CPC — Calling Party Control
• CAM — Computer-Aided Manufacturing
• DXC — Digital Cross Connect
• MC — Maintenance Control
• DCF — Distributed Coordination Function
• VPWS — Virtual Private Wire Service
• DMT — Discrete Multi-Tone Technology
• AMA — automatic message accounting
• BHCA — Busy Hour Call Attempts
• DLL — Digital Local Line
• # — Number sign, octothorp; special function key
• SE — Southeast
• CV — Coding Violation
• COAM — Customer Owned And Maintained
• SFN — Single Frequency Network
• IPR — Intellectual Property Right
• IWF — Interworking Function
• ELFEXT — Equal-Level Far-End Cross-Talk
• MLA — Modern Language Association
• UBR — Unspecified Bit Rate
• CIP — Continuous Improvement Program
• INTELSAT — International Telecommunications Satellite
• EDC — Electronic Dispersion Compensator
• TPC — The Phone Company
• VLSI — Very Large-Scale Integration
• GRUB — Greedy Reclamation of Unused Bandwidth
• BOM — Bit-Oriented Message
• EIR — Excess Information Rate
• WARC — World Administrative Radio Conference
• ALI — Automatic Location Information
• CPE — Customer Premise Equipment
• GI — Graded-Index

• VN — Virtual Network
• ICL — Inserted Connection Loss
• ANC — Access Network Controller
• DICOM — Digital Imaging and Communications in Medicine
• LANE — Local Area Network Emulation
• PIM — Protocol Independent Multicast
• SCCS — Switching Control Center System
• EEHO — Either End Hop Off
• BDE — Borland Database Engine
• BY — Busy
• L2TP — Layer 2 Tunneling Protocol
• ETN — Electronic Tandem Network
• CLEC — Competitive Local Exchange Carrier
• OWS — Operator Work Station
• SIM — Subscriber Identification Module
• YA — Yet Another
• VTAM — Virtual Telecommunication Access Method
• DAS — Data Acquisition System
• SCCP — Signaling Connection Control Point
• TDWR — Terminal Doppler Weather Radar
• CRTS — Cellular Radio Telecommunications Service
• CRV — Call Reference Value
• NCP — Network Control Program
• AAL5 — ATM (Asynchronous Transmission Mode) Adaptation Layer 5
• FNN — Full National Number
• ILD — International Long Distance
• LBR — Low Bit Rate
• WTP — Wireless Transaction Protocol
• CTIA — Cellular Telecommunications Industry Association
• PTO — U.S. Patent And Trademark Office
• FCA — Fixed Channel Allocation
• DNC — Do Not Call
• NRP — Network Resource Planning
• DPT — Dynamic Packet Transport
• AWG — arrayed waveguide grating
• W-CDMA — Wideband Code Division Multiple Access
• DTAP — Direct Transfer Application Process
• GDK — GIMP (GNU Image Manipulation Program) Drawing Kit
• FTTK — Fibre To The Kerb
• ILETS — International Law Enforcement Telecommunications Seminar
• BUFR — Binary Universal Form for the Representation (of data)
• DOR — Detailed Outage Report
• DLCI — data link connection identifier
• BIS — Brought Into Service
• MTD — Moving Target Detection
• ATS — Air Traffic Services
• VQV — Voice Quality Value
• GAN — Global Area Network
• REPT — Report
• SSAP — Source Service Access Point

• MA — Message Analysis
• UDP — Up Down Pair
• LS — Loop Start
• FOIP — Fax Over Internet Protocol
• TACSAT — Tactical Satellite
• NCF — Network Control Facility
• ULL — Unbundled Local Loop
• CDV — Cell Delay Variation(ATM)
• BSC — Bi-Synchronous Communications
• BIND — Berkeley Internet Name Domain
• PNP — Positive-Negative-Positive
• SS1 — Signalling System 1 (500/20 Hz tones)
• VCI — Virtual Channel Identifier
• CLCC — Ceramic Leaded Chip Carrier
• CPOP — Circuit Precedence Over Packet data
• PSO — Professional Services Organization
• WFA — Wait for Answer
• RXQUAL — Received Signal Quality
• FC — Frame Control
• BSA — Basic Service Area
• RADIUS — Remote Authentication dial In User Service
• TLT — Test Loop Translator
• DA — deca
• RCU — Radio Control Unit
• BT — Bluetooth Tablet
• FAC — Forced Authorization Code
• EMF — Event Management Framework
• SSN — Switched Service Network
• PACS — Personal Access Communications System
• ALOC — Average Length Of Call
• CSIRO — Commonwealth Scientific and Industrial Research Organization
• ESPN — Entertainment and Sports Programming Network
• SCR — Sustainable Cell Rate
• GERAN — GSM (Global System for Mobile communications) Edge Radio Access Network
• BDSL — Broadband Digital Subscriber Line
• MSC — Mobile Switching Center
• DQDB — Distributed Queue Dual Bus
• VPX — Virtual Path Cross-Connect
• BT — Burst Tolerance
• B-CPE — Broadband Customer Premises Equipment
• DXF — Data Exchange Format
• F — Frequency
• MP — Modulation Parameter
• BSID — Base Station Identity
• PTT — Push to Talk Technology
• RCP — Right-Hand Circular Polarization
• WSP — Wireless Service Provider
• CIC — Carrier Identification Code
• NW — North West
• URN — Uniform Resource Namespace

• LP — Line Pair
• SRL — Singing Return Loss
• LRQ — Location Request
• TDR — Time-Domain Reflectometry
• LUNT — Line Unit Network Termination
• CAR — committed access rate
• LIM — Line Isolation Monitor
• MTA — Message Transfer Agents (Internet)
• TM — Thematic Mapper (Landsat)
• CACH — Call Appearance Call Handling
• DOCSIS — Data over Cable Service Interface Specification
• IPRC — Intellectual Property Rights Committee
• DNSIX — Defense Network Security Information Exchange
• SNIX — Single Noise Interference Xterminator
• MFLOPS — Millions of Floating Point Operations per Second
• GTP — GPRS (General Packet Radio Service) Tunneling Protocol
• DPA — Distributed-Power Architecture
• CCCH — Common Control Channel
• ADM — Administration Building
• STMR — Sidetone Masking Rating (telecommunications)
• EDSX — Electronic Digital Signal Cross-Connect
• CCLC — Carrier Common Line Charge
• FLL — Fixed-Loss Loop
• RDT — Recall Dial Tone
• FTNS — Fixed Telecommunications Network Services
• RDT — Remote Digital Terminal
• VSAT — Very Small-Aperture Terminal
• ECS — Environmental Control System (Subsystem)
• SCM — Single-Carrier Modulation
• PD — Pulse Duration
• IBSS — Independent Basic Service Set
• ETOC — Electronic Table of Contents
• GRX — GPRS Roaming Exchange
• UTL — Utility
• MMM — Mobile Media Mode
• CMA — Communications Management Association
• NE — Network Element
• 3G — Third Generation (mobile communication system)
• COC — Central Office Connection
• OOK — On/Off Keying
• LH — Link Handler
• SAT — Satellite
• L2F — Layer 2 Forwarding protocol
• ESN — Electronic Serial Number
• M/W — MicroWave
• NT — New Technology, also Windows NT
• FIOS — Fiber Optic Services
• EEROM — Electronically Erasable Read-Only Memory
• DLU — Digital Line Unit
• WNMS — Wireless Network Management System

• FCA — Free Carrier Alongside
• RTB — Retransmission Buffer
• B8ZS — Binary Eight Zero Substitution
• FPS — Framing Pattern Sequence
• UPT — Universal Personal Telecommunications
• DSSSL — Document Style Semantics and Specification Language
• COFA — Change Of Frame Alignment
• PTT — Push to Talk Testing
• IR — International Roaming
• MTI — Moving Target Indicator
• FTTP — Fiber To The Premises
• 2G — Second generation cellular
• FTS — Federal Telecommunications System
• NSAP — Network Service Access Point
• ATSC — Advanced Television Systems Committee
• FMR — Follow Me Roaming
• DDLD — Direct Dial Long Distance
• HFC — Hybrid Fiber Coaxial
• TBPS — Terabits Per Second
• MBE — Molecular Beam Epitaxy
• JISC — Japanese Industrial Standards Committee
• ZCZ — Zero Correlation Zone
• OMF — Object Management Framework
• LAAS — Local Area Augmentation System
• SCH — Synchronization Channel
• QOI — Quality of Information
• UMTS — Universal Mobile Telecommunications Service
• BAN — Billing Account Number
• * — Star, special function key
• TMSI — Temporary Mobile Subscriber Identity
• NTE — Network Terminating Equipment
• INSAT — Indian National Satellite
• ADPCM — Adaptive Differential Pulse Code Modulation
• STU — Secure Telephone Unit
• DEM — Digital Elevation Model
• ATS — Abstract Test Suite
• BAF — Bellcore AMA (Automatic Message Accounting) Format
• MR — Mobile Router
• ERL — Echo Return Loss
• MAP — Mobile Application Part
• LB — Local Battery
• RADINT — Radar Intelligence
• CPAP — Customer Premises Access Profile
• MF — Multiple Frequency
• EFCI — Explicit Forward Congestion Indication (ATM)
• TOC — Telecommunication Operations Center
• PUC — Public Utility Commission (electricity)
• CEPT — Conférence Européenne des Administrations des Postes et des Télécommunications
• GTB — Global Telecom Brokers
• SINAD — SIgnal-to-(Noise And Distortion) ratio

• ATTRA — Appropriate Technology Transfer for Rural Areas
• TBCD — Telephony Binary Coded Decimal
• TU — Transmission Unit
• CERN — Conseil Europeen Pour La Recherche Nucleaire
• MFC — Multi-Frequency Code
• DCAS — Downloadable Conditional Access System
• EPP — Enhanced Parallel Port (PC)
• CAPTAIN — Character And Pattern Telephone Access Information Network
• SMS — Service Management System
• FFH — Fast Frequency Hopping
• OMP — Open Management Platform
• PSDN — Public Switched Digital Network
• ADPC — Automatic Data Processing Center
• TCB — Telecommunication Certification Body
• TD — Transmit Data
• CON — Concentrator
• CID — Craft Interface Device
• EM — Element Manager
• MEAS — Measure
• NDIS — Network Driver Interface Specification (Microsoft Windows NT)
• SCR — System Change Request
• PLCP — Physical Layer Convergence Procedure
• NC — Network Channel
• FAT — Final Acceptance Testing
• VISSR — visible and infrared spin scan radiometer (GOES)
• CBQ — Class-Based Queuing
• MMDS — Multichannel Multipoint Distribution Service
• BABT — British Approvals Board for Telecommunications
• DTE — Digital Terminal Equipment
• CES — Circuit Emulation Service
• CASE — Computer-Aided Software Engineering
• DXI — Data Exchange Interface
• LOP-P — Loss Of Pointer - Path
• TT — Text-Telephone
• 3G HSPA — Third-Generation High-Speed Packet Access
• RIPE NCC — Reseaux IP Europeens Network Coordination Centre
• VADB — Virtual Auto Dial Backup
• NMC — Network Management Center
• ENV — Environment
• DPBX — Digital Private Branch Exchange
• F/W — Firmware
• OSA — Open System Architecture
• DE — Discard Eligibility (ATM)
• DOD — Direct Outward Dialing
• TDM — Time Division Multiplexing
• RRC — Root Raised-Cosine
• LCP — Local Control Point
• WVOIP — Wireless Voice over Internet Protocol
• STM — Scanning Tunneling Microscopy
• CAAS — Communications-as-a-Service

• LLA — Link Level Access
• ET — Exchange Terminal
• FAW — Frame Alignment Word
• DDU — Digital Data Unit
• 3GPP — Third-Generation Partnership Project
• PTT — Push to Talk Taster
• UNI — User-Network Interface
• SPID — Service Profile Identifier
• LCF — Location Confirm
• MSI — Maritime Safety Information
• UCF — Unregistration Confirm
• EV — electronvolt
• SN — Switching Network
• DTL — Defense Telephone Link
• VOB — Voice Over Broadband
• TSC — Test System Controller
• CDV — Compressed Digital Video
• CSAR — Combat Search and Rescue
• SRA — Seamless Rate Adaptation
• S/N — Signal-to-Noise ratio
• CSR — Customer Service Report
• EC — Equipment Controller
• TCA — Threshold Crossing Alert
• ACF — Access Coordination Function
• ESCON — Enterprise System Connection
• OLS — Optical Line System
• CTE — Computer Telephony Engineer
• DAC — Digital to Analog Converter-Audio
• DPNSS — Digital Private Network Signaling System
• DRQ — Disengage Request
• DL — Downlink Message
• ECTF — Enterprise Computer Telephony Forum
• CDA — Communications Decency Act's
• DPDT — Double-Pole Double-Throw
• CCP — Compression Control Protocol
• TC — Technical Committee (HL7)
• SR — Slow Release
• BHA — Busy Hour Attempts
• CAMEL — Customized Applications for Mobile-network Enhanced Logic
• MAU — Multistation Access Unit
• CRS — Cell Relay Service
• APPC — Advanced Program-to Program Communications
• SMS — System Management Server
• ALI — Automatic Location Identifier
• ARFA — Allied Radio Frequency Agency
• DIL — Direct Inward Line
• RPCU — Radio Port Control Unit
• FI — Format Identifier
• SPE — Synchronous Payload Envelope
• WFG — Wireless Firewall Gateway

• DBRNC — deciBel Relative to Noise in a Circuit
• USF — Universal Service Fund
• SA — Selective Availability (on GPS transmissions)
• DNI — Data Network Interface
• FDOA — Frequency Difference Of Arrival
• HDTV — High-Definition Television
• UIT — Union Internationale des Télécommunications
• BATM — Basic Telecommunication Access Method
• DLT — Delete
• TRIG — Trigger
• 100VG — 100 Voice Grade (IEEE 802.12 AnyLAN Standard)
• USA — Underground Service Alert
• RFR — Radio Frequency Radiation
• 4WAI — Four-Wire Analog Interface
• MDN — Mobile Directory Number
• ATU-C — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Central office end
• CTO — Commonwealth Telecommunications Organisation
• DMS — Defense Messaging System
• AQP — Association for Quality and Participation
• LI — Length Indicator
• CLD — Cross-Layer Design
• DCS — Defense Communications System
• MGCP — Multimedia Gateway Control Protocol
• BHCC — Busy Hour Call Completions
• GSTN — General Switched Telephone Network
• FIFO — first-in, first-out
• AIU — Analog Interface Unit
• RADARSAT — Radar Satellite
• SMMR — Scanning Multichannel Microwave Radiometer
• CSDU — Core Service Data Unit
• LSAP — Link Service Access Point
• NLM — NetWare Loadable Module
• VSM — Vestigial Sideband Modulation
• ETSI — European Telecommunications Standards Institute
• ATCA — Advanced Telecom Computing Architecture
• GMSS — Global Mobile Satellite System
• 4WA — Four Wire Analog
• AIS-L — Alarm Indication Signal - Line
• NTSC — National Television Standards Committee
• HUP — Hook-UP
• BB — Blackberry
• BNCC — Base Network Control Center
• LN — Line
• CSR — Customer Service Request
• MAG — Mobile Access Gateway
• VDR — Voice Digitization Rate
• CC — Composite Clock (SONET)
• JWP — Joint Working Party
• STD — Secondary Telecom District
• CALS — Computer Aided Acquisition and Logistic Support

• LRM — Long Reach Multimode
• DPST — Double-Pole Single-Throw
• EST — Electroshock Therapy
• MPU — Main Processor Unit
• PSLV — Polar Satellite Launch Vehicle (Indian Space Research Organization; India)
• STM — Synchronous Transfer Mode
• IS 41 — Interim Standard 41 (Inter-Cellular Network Communication Protocol)
• NEMP — Nuclear Electromagnetic Pulse
• LEED — Low-energy Electron Diffraction
• TCC — Transmission Control Code
• LAPB — Link Access Protocol-Balanced
• BT — Back Trace
• WAE — Wireless Application Environment
• RS-422 — Recommended Standard 422 (ANSI/EIA standard for transmitting serial data)
• LSC — Link State Control
• BIC — Bus Interface Controller
• ACU — Automatic Calling Unit
• SDNS — Secure Data Network System
• WSA — Wireless Security Auditor
• AT — Attenuation
• GS — Ground Start
• SEM — Scanning Electron Microscopes
• VOB — Versioned Object Base
• LCAS — Link Capacity Adjustment Scheme
• CRBT — Color Ring Back Tone
• PCS — Personal Communications Services
• DUN — Dial-Up Networking
• PDSO — Packet Data Security Overlay
• PSN — Public Switched Network
• CBMS — Computer-Based Message System
• B-ISDN — Broadband ISDN
• SCORM — Shareable Content Object Reference Model
• ALCAP — Access Link Control Application Protocol
• BPSK — Binary Phase-shift Keying
• IDCP — Internet Device Control Protocol
• FRF-LMI — Frame Relay Forum - Local Management Interface
• NAU — Network Addressable Unit
• DECT — Digital Enhanced Cordless Telecommunication
• P2P — Person-to-Person
• MTP — Message Transfer Part
• BTS — Base Transceiver Station (cellular)
• PMMA — Polymethyl Methacrylate
• DS-3 — Digital Signal, Level 3
• ATRAC — Adaptive Transform Acoustic Coding
• NICT — National Institute of Information and Communications Technology
• PTE — Path Terminating Equipment (SONET)
• WIN — Wireless Intelligent Network
• TP — Transition Point
• CDDI — Copper Distributed Data Interface
• ARD — Automatic Ring Down

• IDLC — Integrated Digital Loop Carrier
• ATD — Advanced Technology Demonstration
• BTP — Business Telecom Products, Inc.
• AMTFT — Active Matrix Thin Film Transistor
• CFOT — Certified Fiber-Optic Technician
• TPS — Telephone Preference Service
• NAP — Network Access Point
• VNS — Virtual Network System
• RADSL — Rate Adaptive Digital Subscriber Line
• CCA — Carrier-Controlled Approach
• PY — person-year
• LMT — Lightwave Microcell Transceiver
• IVP — Integrated Voice Protocol
• DMT — Discrete Multi-Tone
• BORSCHT — Battery feed, Overvoltage protection, Ringing, Signaling, Coding, Hybrid, and Testing
• PHY — Physical Layer
• FIRST — Forum of Incident Response and Security Teams (CERT)
• BUS — Broadcast and Unknown Server
• CAS — Column Address Strobe
• LCGN — Logical Channel Group Number
• VNL — Via Net Loss
• EC — Entropy Coding
• PSK — Phase Shift Key
• VPC — Virtual Path Connection (ATM)
• DECCO — DISA Defense Commercial Communications Office
• CCSA — Common Control Switching Arrangement
• MB — Measured Business
• FGDC — Federal Geographic Data Committee's
• WTNM — Working Telephone Number Management
• CLOS — Clear Line Of Sight
• WFT — Wireline Formation Test
• SAR — Segmentation and Reassembly (ATM)
• PJC — Pointer Justification Count
• TSDU — Transport Service Data Unit
• TNI — Telephone Network Interface
• ARPT — Autorité de Régulation des Postes et Télécommunications
• RTC — Right to Carry
• RM-ODP — Reference Model for Open Distributed Processing
• RP — Radio Port
• RDSS — Radio Determination Satellite Service
• 3GSM — Third-generation Global System for Mobile (communications)
• SMSC — Short Message Service Center
• ATB — Above-Ground Telecommunications Backbone
• ZD — Zero Defects
• DUV — Data-Under-Voice
• TP — Telephone Pole
• FMS — Fixed Mobile Substitution
• BAP — Bandwidth Allocation Protocol
• MCR — Minimum Cell Rate (ATM)
• LORAN — Long Range Aid to Navigation System

• WFA — Work Force Administration
• ESM — electronic support measure
• CDVT — Cell Delay Variation Tolerance
• ANT — ADSL Network Terminator
• ETOM — Enhanced Telecom Operations Map
• CLP — Cell Loss Priority (ATM)
• CACM — Communications of the ACM
• TD-CDMA — Time Division - Code Division Multiple Access
• PCCA — Portable Computer Communications Association
• VR — Virtual Router
• NRZ — Nonreturn To Zero
• VAD — Voice Activity Detection
• TCM — Time Compression Multiplexer
• BWX — Broadband Wireless Exchange
• AFPS — Automatic Facility Protection Switching
• EC-N — Electrical Carrier (n=a number, e.g., EC-4)
• TCS — Telephony Control Specification
• VSC — Vertical Service Code
• BSRF — Basic System Reference Frequency
• VOFR — Voice Over Frame Relay
• SSP — Security Service Provider
• NSE — Network Software Environment
• STA — Science and Technology Agency (Japan)
• VCC — Voice Call Continuity
• PLE — Path Length Efficiency
• KEK — Key Encrypting Key
• JSC — Joint Scientific Committee (ICSU, WCRP, and WMO)
• IBS — In-Building Solutions
• ACM — Address Complete Message
• BCS — British Computer Society
• GOSIP — Government Open Systems Interconnection Profile
• DMT — Digital-Discrete Multi-Tone
• MILNET — Military Network
• DCC — Digital Control Channel
• IXC — interexchange carrier
• GTM — Go to Meeting
• CSTA — Computer Supported Telecommunications Applications
• X — X Window System
• PMT — Photo Multiplier Tube
• LIDB — Line Information DataBase
• KTS — Key Telephone System
• NFR — Near-Field Recording
• GOMP — Get Off My Phone
• LMDS — Local Multipoint Distribution Service
• SDHLR — Super-Distributed Home Location Register
• EC — Echo Cancelling
• ADM 3X — DS3 Add-Drop Multiplex
• AEA — American Electronics Association's
• QS — Quasi-Synchronous
• DTU — Date/Time Update

• HEC — Header Error Control
• AAP — Alternate Access Provider
• RLA — Received Level Average
• NESC — National Electrical Safety Code
• AECT — Association for Educational Communications and Technology's
• LMS — Location and Monitoring Service
• ANAC — An Automatic Number Announcement Circuit
• VLF — Vertical-Laminar-Flow
• IPOATM — Internet Protocol over ATM
• ECS — Encryption Control Signal
• BP — Block Parity
• CDM — Configuration Data Manager
• BCSM — Basic Call State Model
• NPSI — Network Packet Switching Interface
• FOC — Fiber-Optic Cable
• MIS — Marketing Intelligence System
• N-AMPS — Narrowband Advanced Mobile Phone System
• RSN — Regional Service Network
• TLP — Transmission Level Point
• IMPI — IP (Internet Protocol) Multimedia Private Identity
• PT — Payload Type (ATM)
• ULP — Upper Layer Protocol
• DMT — Discrete Multi-tone Transmission
• UMTS — Universal Mobile Telecommunication System
• BDFB — Battery Distribution Feeder Bay
• PSQM — Perceptual Speech Quality Measure
• E2E — End-to-End
• IDCU — Integrated Digital Carrier Unit
• QPM — QoS (Quality of Service) Policy Manager
• LSP — Label Switched Path
• EC — Enhanced Cellular
• LOB — Line Of Bearing/Balance
• EA — expedited acknowledgement
• USRT — Universal Synchronous Receiver/Transmitter
• IPXCP — Internetwork Packet Exchange Control Protocol
• DCO — Dial Central Office
• RAD — Recorded Announcement Device
• CDA — Communications Decency Act of 1996
• BAOC — Barring of All Outgoing Calls supplementary service
• ADIF — Accounting Data Interchange Format
• ADTM — Asynchronous Data Transfer Mode
• UCM — Use Case Map
• PTM — Packet Transport Mode
• FEAC — Far End Alarm and Control
• SDN — Software Defined Network
• AAL — ATM (Asynchronous Transmission Mode) Adaptive Layer
• ESG — Enhanced Service Gateway
• CLF — Carrier Line Failure
• P&A — Privacy and Authentication
• AFI — Authority and Format Identifier

• OSD — Onscreen Display
• SMT — station management (protocol)
• WIS — WAN (Wide Area Network) Interface Sublayer
• AI — Adapter Interface
• SDSL — Symmetrical Digital Subscriber Line
• TP — Termination Point
• VCT — Variable Cam Timing
• RNR — Receive Not Ready
• SAMI — Structured Adjustment & Maintenance Interface
• AB — Answer Back
• 3GIP — Third Generation Internet Protocol
• CCCI — Command, Control, Communications and Intelligence
• VAN — Value-Added Network
• DNA — Do Not Answer
• DOD — Dial on Demand
• PGP — Pretty Good Protection (encryption)
• AGCH — Access Grant Channel
• RLS — Recursive Least Squares
• TSI — time-slot interchange
• AAV — Alternate Access Vendor
• CIS — Center for Integrated Systems
• LXT — Local Exchange Terminal
• GFC — Generic Flow Control (ATM)
• EVC — Electronic Voucher Charging
• SAPI — Service Access Point Identifier
• OODBMS — Object-Oriented Database Management Systems
• CFR-47 — Code of Federal Regulations Title 47 (FCC)
• BPP — Billed Party Preference
• KSPS — KiloSymbols Per Second
• SQL — Specified Quality Level
• PFE — Power Feed Equipment
• AAL2 — ATM (Asynchronous Transmission Mode) Adaptation Layer 2
• HDB3 — High-Density Bipolar Three-bit substitution
• TTC — Telemetry Telecommand and Control
• HPN — Home Phone Network
• SM OFC — Single-Mode Optical Fiber Cable
• BCIX — Berlin Commercial Internet Exchange
• OIM — Operations Interface Module
• SSU — Synchronization Supply Unit
• BASIZE — Buffer Allocation Size
• ACNA — Access Customer Name Abbreviation
• TP-PMD — Twisted Pair Physical Medium Dependent
• VO — Voice Only
• DSU — Digital Service Unit
• SBX — Small Business Exchange
• USF — Universal Server Farm
• CT — Cordless Telecommunications
• FR — Functional Requirement
• BSC — Base Station Controller
• SLIP — Serial Line Internet Protocol

• MNP — Mobile Number Portability
• A/D — Analog-to-Digital converter
• CATI — Computer-Assisted Telephone Interviewing
• CD — Committee Draft
• VCA — Voice Connecting Arrangement
• DMI — Desktop Management Interface (computing)
• ANS — Advanced Network Services
• BAM — Basic Access Module
• AMTI — Airborne Moving Target Indicator
• DDSN — Digital Derived Services Network
• SS7 — Signaling System 7
• CEE — Communaut? Economique Europ?enne
• DTR — Down-Time Ratio
• DDM — Data Distribution Manager
• VCR — Videocassette Recorder
• COBE — Corporate Owned Business Only
• EF&I — Engineering, Furnishing and Installation
• WATS — Wide Area Telecommunications Service
• MOS — Metal Oxide Semiconductor (FET Devices)
• Z — Zulu Time
• MBMS — Multimedia Broadcast/Multicast Service
• SGSN — Serving GPRS (General Packet Radio Service) Support Node
• CM — Connection Manager
• WPBX — Wireless Private Branch Exchange
• SCC — Specialized Common Carrier
• IVN — Interactive Video Network
• LDI — Long Distance Interconnect
• CCR — Current Cell Rate (ATMF)
• MO — Magneto-optic
• LSI — Large-Scale Integration
• COI — Community of Interest
• FLN — Fixed Line Network
• WNAP — Wireless Network Access Point
• LFTYR — Ley Federal de Telecomunicaciones y Radiodifusión
• PTCL — Pakistan Telecommunication Company Ltd
• MEH — Mobile-Executed Handoff
• DSCS — Defense Satellite Communication System
• HU — Hook Up
• CNID — Calling Number Identification Display
• PTT — Post Telegraph and Telecommunications
• ISD — International Subscriber Dialling
• DTW — Dynamic Time Warping
• CDSL — Consumer Digital Subscriber Line
• DCMES — Dublin Core Metadata Element Set
• DPT — Dial Pulse Terminate
• WDSL — Wireless Digital Subscriber Line
• RCT — remote Control Terminal
• VLR — Visitor Location Register
• SGCP — Simple Gateway Control Protocol
• BSS — Broadband Switching System

• DF — Direction Finding or Finder
• ARCNET — Attached Resource Computer Network
• LVM — Line Verification Module
• DLE — Digital Local Exchange
• MERIS — medium-resolution imaging spectrometer
• AMOLED — Active Matrix Organic Light-Emitting Diode
• ANSI — Advanced Network Signaling Input
• AEIMP — Apple Event Interprocess Messaging Protocol
• DACS — Digital Access and Cross-Connect System
• SMU — Service Management Unit
• SNI — Service Node Interface
• XRF — X-Ray Fluorescence
• CD-ROM — Compact Disk-Read-Only Memory
• BONDING — Bandwidth On Demand Interoperability Group
• O — objective
• CDPD — Cellular Digital Packet Data
• AARQ — A-Associate Request
• FUD — Fair Use Doctrine
• ATL — Advanced Technology Laboratory
• VFL — Visual Fault Locator
• NAM — Number Assignment Module
• ATU-R — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Remote terminal end
• QOTS — Quality Of Telephone Services
• NCOS — Network Class Of Service
• CD ROM — Compact Disc Read-Only Memory
• VGF — Voice Grade Facility
• VDSL — VHBR (Very High Bit Rate) Digital Subscriber Line
• CSCW — Computer-Supported Cooperative Work
• GLT — Great Lakes Telecom
• LULT — Line Unit/Line Termination
• CSP — Converged Service Platform
• VC — Virtual Circuit (ATM)
• CCH — Common Channel Handler
• CALA — Customer Address Location Area
• CLI — Calling Line Identification
• AVT — Audio Visual Telecommunications
• PTI — Payload Type Indicator
• LAT — Local Area Transport (network)
• DLT — Digital Line Termination
• CAN — Controller Area Network
• ESA — Enhanced Subscriber Authentication
• SCO — Synchronous Connection Oriented
• DE — Discard Eligible
• PMOS — P-channel Metal Oxide Semiconductor
• MBS — Maximum Burst Size (ATM)
• LTU — Line Terminating Unit
• UTRAN — UMTS (Universal Mobile Telecommunication System) Terrestrial Radio Access Network
• AFRINIC — African Network Information Centre
• FD — Full Duplex
• WAW — Wide Area Wireless

• GSM — Global System for Mobile telecommunications
• DCEF — Distributed Cisco Express Forwarding
• MMB — Middle Mouse Button
• ISSI — Inter-Switching System Interface
• RTFM — Read The Friendly Manual
• MVDS — Microwave Video Distribution System
• TRAC — Totally Reconfigurable Analog Circuit
• TRCSL — Telecommunications Regulatory Commission of Sri Lanka
• ECC — Emergency Communications Center
• AIS-V — Alarm Indication Signal - Virtual
• SR — Service Request
• ACMA — Atlantic Cable Maintenance Agreement
• MIN — Mobile Identification Number
• UMTS — Universal Mobile Telecommunications Standard
• ASAS — All-Source Analysis System
• BRAN — Broadband Radio Access Network
• TRX — Tandem Repeater eXchange
• INWATS — INward Wide Area Telecommunications Service
• SHR — Self-Healing Ring
• PLCP — Physical Layer Convergence Protocol (ATM)
• PNM — Pulse Number Modulation
• IMTS — Improved Mobile Telephone Service
• RLC — Radio Link Control
• LZ — Lempel-Ziv compression algorithm
• WBMP — Wireless Bitmap
• SYSADM — System Administrator
• HSCSWD — High-Speed Circuit-SWitched Data
• LCU — Lightweight Computer Unit
• LRF — Laser Range Finder
• DORA — EV-DO (EVolution-Data Optimized) standard Revision A
• QPA — Quality Performance Analysis
• PROV — Provisioning
• DOV — Data-Over-Voice
• DAF — Directory Access Function
• ESDS — Electrostatic Discharge Sensitive
• MDCP — Media Device Control Protocol
• RCF — Remote Call Forwarding
• DS0 — Digital Signal Zero
• LPDP — Local Policy Decision Point
• OCI — object code insertion
• NIMH — Nickel-Metal Hydride
• ACRE — Authorization and Call Routing Equipment
• PCIA — Personal Communications Industry Association
• WIVO — WIreless VelOcity
• TWX — Teletypewriter Exchange (Telex)
• NMS — NetWare Management System
• LSMS — Local Service Management System
• OST — Office of Science and Technology
• SR — Scanning Radiometer
• ALT — Automatic Link Transfer

• CCSS6 — Common Channel Signaling System # 6
• MTS — Message Transmission Subsystem
• FEBE — Far End Block Error (SONET)
• INAP — Intelligent Network Application Part
• WRED — Weighted Random Early Detection
• DOITT — Department of Information Technology and Telecommunications
• RBT — Ring Back Tone
• SCE — Service Creation Environment
• CPT — Cellular Paging Teleservice
• DBF — Digital Beam-Forming
• EGPRS — Enhanced General Packet Radio Service
• COP — Character Oriented Protocol
• TP — Transaction Processor
• DS-1 — Digital Signal, Level 1
• FB — Fine Business
• PM — Processable Mode
• CWTS — China Wireless Telecommunication Standard
• NSN — National Significant Number
• SASL — Simple Authentication and Security Layer
• EKTS — Electronic Key Telephone Set
• DAS — Distributed Antenna System
• RBS — Robbed Bit Signaling
• TIMS — Telephone Information Management System
• ATMS — automatic transmission measuring system
• CLASS — Cell Level ATM (Asynchronous Transfer Mode) Services Simulator
• C² — Command and Control
• CS — Connection Segment
• SPI — Security Parameters Index
• GOS — Gerry Otis Simpson
• AAS — Automatic Announcement Subsystem
• TON — IEEE/ACM Transactions On Networking
• TARP — Target Identifier Address Resolution Protocol
• RYP — Russian Yellow Pages
• IOC — Interoffice Channel
• ATIS — Alliance for Telecommunications Industry Solutions
• ISC — International Switching Center
• XWI — XML (extensible markup language) for Wireless Images
• CMT — Commercial Metering Transponder
• UDT — Unreliable Data Transfer
• JDC — Japan Digital Cellular
• TJB — Telephone Junction Box
• LRB — Loop Reverse Battery
• USPI — Universal Serial Phone Interface
• A/C — Air Conditioner
• DMB — Disconnect and Make Busy
• FPLMTS — Future Public Land Mobile Telecommunications System
• ECDIS — Electronic Chart Display Information System
• MRCA — Most Recent Common Ancestor
• TACS — Total Access Cellular System
• AA — Auto-Answer

• SPT — System Page Table
• GOSIP — Government Open System Interconnection Profile
• E — Exchange
• AEE — Agent Execution Environment
• JMA — Japanese Meteorological Agency
• ACEK — Authentication Encryption Key
• ROSE — Remote Operations Service Element
• MEECN — Minimum Essential Emergency Communication Network
• ADM — Administration, Office of
• SIGTRAN — Signaling Transport
• SVI — Service Interception
• TEM — Transmission Electron Microscope
• ATIS — Automatic Transmitter Identification System
• CFS — Call for Service
• CCITT — Comite Consultatif International Telegraphique et Telephonique (now ITU-T)
• LTU — Line Termination Unit
• CSL — component sublayer
• PTN — Public Telephone Network
• VGC — Voice Grade Channel
• FESS — Flywheel Energy Storage System
• SHD — Smart Handheld Device
• MNOS — Metal-nitride-oxide Semiconductor
• CMAS — Cellular Management System
• UIH — Unnumbered Information with Header check
• APS — Advanced Power System
• NICAD — Nickel Cadmium
• CYTA — Cyprus Telecommunications Authority
• MITS — Metaphors for Integrated Telecommunications Services
• MC/MIC — Mode Common/Mode Indicate Common
• NARC — Non-Automatic Relay Center
• LCU — Line Control Unit
• SMAS — Service Management System
• AFCEA — Armed Forces Communications and Electronics Association's
• QOD — Quality of Data
• DTS — Digital Terminal Systems
• CELP — Code Excited Linear Prediction
• TACSIM — Tactical Simulation (Simulator)
• PTM — Point-To-Multipoint
• D3 — Digital channel bank, Third generation
• ADTS — Ameritech Digital Transport Service
• STUN — Simple Traversal of UDP (User Datagram Protocol) through NAT (Network Address Translation)
• DSX — Digital Signal Cross-Connect
• DACS — Digital Access Carrier System
• WAAS — Wide Area Augmentation System
• DME — Distributed Management Environment (OSF)
• SVW — Sioux Valley Wireless
• ADC — Advanced Data Control
• TAE — Terminal Adapter Equipment
• CVT — Circuit Validation Test
• CAE — Common Application Environment

• TCL — Transverse Conversion Loss
• MP — Master Processor
• JWG — Joint Working Groupof
• ATB — All Trunks Busy
• NETBIOS — Network Basic Input-Output System
• SINS — Ship’s Inertial Navigation System
• OTF — On-The-Fly (data acquisition method)
• SNI — Subscriber Network Interface
• BC — Basic Call
• SIO — Service Information Octet
• CPN — Customer Premise Network
• TASI — Time Assigned Speech Interpolation
• BFS — Broadcast File System
• WDMW — Web Directory for Mobile and Wireless
• TSG — Telephone Security Group
• MAC — Message Authenticity Check
• DEO — Digital End Office
• DBN — Dial-Back Number
• ATACS — Army Tactical Communications System
• 800 — Freephone
• AAV — Alternative Access Vendor
• UPC — Usage Parameter Control
• TSGR — Transport System Generic Requirements
• LEC — Liquid Encapsulated Czochralski
• PWM — Pulse width modulation
• CU — Cooling Unit
• ZBTSI — Zero Byte Time Slot Interchange
• RTU — Right to Use
• BPOP — Building Point of Presence
• BTL — Bell Telephone Laboratories, Inc.
• DLC — Digital Leased Circuit
• TDRS — Tracking and Data Relay Satellites
• WPC — Wireless Personal Communications
• MMS — Multimedia Message Service
• TPF — Transmission Priority Field
• SS6 — Signalling System 6
• VTA — Vermont Telecommunications Authority
• TFL — Telecom Fiji Limited
• WAWS — Washington Area Wideband System
• CCC — CDMA Cluster Controller
• EADAS — Engineering and Administrative Data Acquisition System
• CQ — Communications Quality
• CEPT — Conference of European Posts and Telecommunications
• SSU — Stratospheric Sounding Unit (TOVS)
• APPN — Advanced Peer-to-Peer Network
• XC — Cross-Connect
• MCPC — Multiple Channels Per Carrier
• UNO — Universal Network Operations
• DMNG — Digital Mobile News Gathering
• VPM — Voice Private Message

• MLHG — Multi-Line Hunt Group
• MSG — Management Steering Group
• NSDI — National Spatial Data Infrastructure
• MMJ — Modified Modular Jack
• SMDS — Switched Multi-megabit Data Service
• SMDR — station message detail recording
• 4G — Fourth Generation
• CCS — Common Channel Signaling
• TED — Triteal Enterprise Desktop
• DDS — Dataphone Digital Service (AT&T)
• WUP — Wired Up Privacy
• CM — Common Mode
• AH — Authentication Header
• APR — Alarm Processing Remote
• AFIPS — American Federation of Information Processing Societies
• LQR — Line Quality Report
• SEM — Sionscanning Electron Microscopy
• WTL — Wireless Transport Layer
• DPDCH — Dedicated Physical Data Channel
• ASP — Active Signaling Protocol
• AMP — amplifier / amplification
• CIPOA — Classical Internet Protocol over ATM (Asynchronous Transfer Mode)
• NMC — Nortel Matra Cellular
• BTN — Billing Telephone Number
• BOA — Basic Object Adapter
• EMV — EuroPay, MasterCard, Visa
• ITU-T — International Telecommunication Union - Telecommunications section
• VLP — Very Low Power
• TSR — Terabit Switch/Router
• TPSP — Third Party Service Provider
• FOE — Fiber Optic Equipment
• SH — Shell
• FWS — Fixed Wireless Services
• TSD — Type Specific Driver
• AIS-P — Alarm Indication Signal - Path
• SACS — Security Access Control System
• SLIC — Subscriber Loop Interface Circuit
• SMLC — Serving Mobile Location Center
• GEO — Geostationary Earth Orbit
• DTU — Data Terminal Unit
• IDSL — ISDN (Integrated Services Digital Network) Digital Subscriber Line
• CLIP — Caller Line Identification Presentation
• EDGE — Enhanced Data for GSM (Global System for Mobile communication) Evolution
• ACA — Automatic Circuit Assurance
• INMS — Integrated Network Management System
• TAPI — Telephony Application Programming Interface
• BIOS — Basic Input-Output System
• BHP — Burst Header Packet
• OID — Object Interaction Diagram
• TX — Transmit

• TTIL — Team Telecom International Ltd.
• VHM — Voice Health Monitor
• DACS — Digital Access Cross-Connect Switch
• GTXC — Global Telephone Exchange Carrier
• EDT — European Deaf Telephone
• IOS — Internet Over Satellite
• BTO — Betts Telecom Oklahoma
• ICLD — Inter-Channel Level Difference
• HUMAN — High-speed Unlicensed Metropolitan Area Network
• MOD — Modulo
• WLNP — Wireless Local Number Portability
• PNE — Path Number Efficiency
• ASTE — Advanced Systems and Telecommunications Equipment
• SAMA — Spread Aloha Multiple Access
• NSEP — National Security Emergency Preparedness
• BSVCI — Broadcast Signaling Virtual Channel Identifier
• MAPDU — Management Application Protocol Data Unit
• ABR — Available Bandwidth Rate
• LASINT — Laser Intelligence
• LQD — Line Quality Disturbance
• TSC — Technical Standards Committee
• VPL — Virtual Path Link (ATM)
• ALC — Automatic Line Controller
• DFT — Draft Tax Forms
• 802.11 HR — High data Rate IEEE 802.11 Wireless LAN protocol
• PVN — Private Virtual Network
• CSLIP — Compressed SLIP
• DISA — Direct Inward Switch Access
• SC — Switching Center
• AC — Absorption Coefficient
• ADTS — Automated Digital Terminal System
• PPV — Pay-Per-View
• CAP — Competitive Access Provider
• WCMP — Wireless Control Message Protocol
• CFNA — Call Forwarding No Answer
• FCFS — First-Come, First-Served
• ACL — Asynchronous Connection-less Link
• CSAA — Central Service Area Authority
• RLC — Reverse Link Channel
• WPKI — Wireless Public Key Infrastructure
• CNE — Certified Novell Engineer
• TRANS — Transaction
• UIF — User Interface Framework
• VAB — Vehicle Assembly Building
• NMC — Network Model Coverage
• SDLC — Systems Development Life Cycle
• CTIT — College of Telecommunications and Information Technology
• CMTS — Cellular Mobile Telephone System
• CTTC — Centre Tecnològic de Telecomunicacions de Catalunya
• RAI — remote alarm indication

• BSSMAP — Base Station System Management Application Part
• PAGCH — Paging and Access Grant Channel
• CPCI — Compact Peripheral Component Interconnect
• TCAM — Telecommunications Access Method
• HTO — Hellenic Telecommunications Organisation
• AS — Active Service
• ITA — Illinois Telecommunications Association
• SMG — Super Master Group
• SDCCH — Standalone Dedicated Control Channel
• MAPI — Messaging Applications Programming Interface
• FDMMA — Frequency Division Multiplexing Multiple Access
• ELSEC — Electronic Security
• LDM — Limited Distance Modem
• TME — Telocator Message Entry