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Computing & IT >> Telecom Abbreviations

Look through 4999 acronyms and abbreviations related to Telecom:

• IPB — Invision Power Board
• DDRS — Dynamic Data Rate Selection
• XFMR — Transformer
• CBCU — Centralized Broadband Control Unit
• DCE — Data Circuit-terminating Equipment
• DWDM — Dense Wavelength Division Multiplexing
• DOE — Distributed Object Environment
• EBITDA — Earnings before Interest, Taxes, Depreciation and Amortization
• SYN — Synchronous
• LAN — Local Area Network
• ECG — Electrocardiogram
• CT — Computed Tomography
• GFSK — Gaussian Frequency Shift Keying
• CSR — Customer Service Representative
• ETA — Estimated Time of Arrival
• CSMA/CA — Carrier Sense Multiple Access/Collision Avoidance
• CSMA/CD — Carrier Sense Multiple Access with Collision Detection
• CONG — Congestion message
• CSMA/CD — Carrier sense multiple access / collision detection
• APR — Annual Percentage Rate
• CSMA — Carrier Sense Multiple Access
• IQ — Intelligence Quotient
• ISAR — Inverse Synthetic-Aperture Radar
• ROM — Read-Only Memory
• YMMV — Your Mileage May Vary
• BRDF — Bidirectional Reflectance Distribution Function
• DAM — Diagnostic Acceptability Measure
• YTD — Year To Date
• D-H — Diffie-Hellman
• XML — Extensible Markup Language
• MLS — Microwave Landing System
• FTP — File Transfer Protocol
• ADM — Add-Drop Multiplexer
• DWDM — Dense Wavelength-Division Multiplexing
• OIC — Oh I See
• FDIC — Federal Deposit Insurance Corporation
• RDF — Resource Description Framework
• MAN — Metropolitan Area Network
• ISO — In Search Of
• LASER — Light Amplification By Stimulated Emission Of Radiation (cf. Maser)
• ASAP — As Soon As Possible (pronounced AY-sap)
• DSC — Differential Scanning Calorimetry
• ATOM — Any Transport over MPLS (Multi-Protocol Label Switching)
• CPU — Central Processing Unit
• BBS — Bulletin Board Service
• IT — Information Technology
• ANSI — American National Standards Institute, Inc.
• CPE — Customer Premises Equipment
• AUP — Acceptable Use Policy
• F2F — Face To Face (also Meeting In Person)

• LED — Light-Emitting Diode
• TEMIP — Telecommunications Management Information Platform
• IRC — Internet Relay Chat
• IAMAI — Internet and Mobile Association of India
• WWW — World Wide Web
• UK — United Kingdom of Great Britain and Northern Ireland
• ECU — Electronic Control Unit
• RF — Radio Frequency
• DAC — Discretionary Access Control
• TNYWR — The Number You Will Receive
• BVR — Beyond Visual Range
• CDR — Critical Design Review
• DND — Do Not Disturb
• RFQ — Request For Quotation
• BTW — By The Way
• OEM — Original Equipment Manufacturer (usually in reference to car parts)
• VIP — Very Important Person
• DBORS — Data Base of Records
• CUG — Closed User Group
• FEMA — Federal Emergency Management Agency
• DSCP — Differentiated Services Control Point
• CSA — Canadian Space Agency
• QC — Quality Control
• WTG — Way To Go
• ISO — International Organization for Standardization
• LCD — Liquid Crystal Display
• EAP — Employee Assistance Program
• SAR — Search And Rescue
• UDP — User Datagram Protocol (FDDI related)
• ACC — Adaptive Cruise Control
• AFAIK — As Far As I Know
• CCM — counter-countermeasure
• CCSDS — Consultative/Consultative Committee for Space Data Systems
• MBR — Master Boot Record
• IRL — In Real Life
• PDR — Preliminary Design Review
• C4I — Command, Control, Communications, Computers, & Intelligence
• IP — Internet Protocol
• FET — Field Effect Transistor
• EDI — Electronic Data Interchange
• BIP — Bit-Interleaved Parity
• CCB — Change Control Board
• ATM — Automatic Teller Machine
• ESA — European Space Agency
• ACK — ACKnowledgment
• AC — Alternating Current
• WML — Wireless Markup Language
• ABI — Application Binary Interface
• GSM — Global System for Mobile Communications
• AATSR — Advanced Along-Track Scanning Radiometer

• LRU — Line Replaceable Unit
• DFD — Displaced Frame Difference
• CY — Calendar Year
• DBMS — Database Management System
• ACH — Automated Clearing House
• WWW3 — World Wide Web Consortium
• BUR — Bandwidth Usage Redundancy
• WEP — Wired Equivalent Privacy
• PSK — phase-shift keying
• ACE — Access Control Entry
• LRJ — Location Reject
• NOS — Network Operating System
• IRR — Internal Rate of Return
• CD — Compact Disc
• QFSK — Quadrature Frequency Shift Keying
• RPI — Retail Price Index
• BPM — Beats Per Minute
• WDM — Wavelength Division Multiplexing (fiber optics)
• ATTN — Attention
• POC — Point Of Contact
• COB — close of business (End of duty day)
• EIS — Executive Information System
• CV — Curriculum Vitae
• ISP — Internet Service Provider
• RWR — Radar Warning Receiver
• GATT — General Agreement on Tariffs and Trade (government)
• ASA — American Standards Association
• SMTP — Simple Mail Transfer Protocol
• VM — Voice Mail
• 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.
• RFP — Request For Proposal
• NFS — Network File System
• FAR — Federal Aviation Regulation
• HTTP — Hypertext Transfer Protocol
• MB — Megabyte
• NMSE — Normalized Mean Square Error
• LLC — Limited Liability Company
• AES — Advanced Encryption Standard
• ALC — Automatic Level Control
• CS — Computer Science
• ATA — Area Transportation Authority
• MMS — Multimedia Messaging Service
• DDD — Direct Distance Dial
• PDA — Personal Digital Assistant
• TQM — Total Quality Management
• Y2K — Year 2000
• GIS — Geographic Information System
• CAUCE — Coalition Against Unsolicited Commercial Email
• EOM — End Of Message
• PPM — parts per million

• APT — Automatic Picture Transmission
• CEO — Chief Executive Officer
• PDH — Plesiochronous Digital Hierarchy
• STS — Space Transportation System
• VAT — Value Added Tax
• BSD — Berkeley Software Distribution
• CGI — Common Gateway Interface
• ASME — American Society of Mechanical Engineers
• MOU — Memorandum of Understanding (an MOU between Food & Drug Administratin and a regulatory agency in another country allows mutual recognition of inspections)
• DSA — Digital Signature Algorithm
• SDMA — Space Division Multiple Access
• R&D — Research & Development
• HSD — High Speed Data
• ATM — Asynchronous Transfer Mode
• ADD — Addendum
• AAC — Advanced Audio Coding
• ADSL — Asymmetric Digital Subscriber Line
• ACD — Automatic Call Distributor
• MST — Mountain Standard Time
• ACO — Additional Call Offering
• WBS — Work Breakdown Structure
• FM — frequency modulation
• AES — Auger Electron Spectroscopy
• EFF — Electronic Frontier Foundation
• PDT — Pacific Daylight Time
• AIS — Automated Information System
• MRI — Magnetic Resonance Imaging
• WAN — Wide Area Network
• DDL — Data Definition Language
• ADM — Add/Drop Multiplexer
• THX — Thanks
• SAN — Storage Area Network
• PDF — Portable Document Format (created by Adobe Acrobat)
• DMSP — Defense Meteorological Satellite Program (U.S.)
• X-BAR — Crossbar telephone exchange
• PUHU — Pick Up Hang Up
• BRB — Be right back
• COR — Carrier Operated Relay
• API — Application Programming Interface
• AM — Ante Meridian
• ADR — Address
• BTU — British Thermal Unit
• SCSI — Small Computer System Interface
• CAE — Computer-Aided Engineering
• AIR — Account Information and Refill
• CCIS — Common Channel Interoffice Signaling
• DME — Distance Measuring Equipment
• CR — Carriage Return
• UAV — Unmanned Aerial Vehicle
• EST — Eastern Standard Time

• NIC — Network Interface Card
• GPRS — General Packet Radio Service
• ASTM — American Society for Testing and Materials (Philadelphia, Pennsylvania)
• EW — Electronic Warfare
• ABC — activity based costing
• ABR — Available Bit Rate
• SLA — Service Level Agreement
• RDY — Ready
• AME — Amplitude Modulation Equivalent
• IPO — Initial Public Offering
• PCB — printed circuit board
• WWW — World Weather Watch
• RFC — Request For Comment
• RNC — Radio Network Controller
• S X S — Step-by-Step
• AC — Access Control
• ATCRBS — Air Traffic Control Radar Beacon System
• SRAM — Static Random Access Memory (ess-ram)
• TCB — Trusted Computing Base
• DOA — dead on arrival
• VVX — Voice and Video eXchange
• CIR — Committed Information Rate (Frame Relay)
• SCC — Standards Council of Canada
• FAA — Federal Aviation Administration
• JV — Joint Venture
• EC — European Commission
• VR — Virtual Reality
• BECN — Backward Explicit Congestion Notification
• QI — Quality Improvement
• TCP — Transmission Control Protocol
• CIO — Chief Information Officer
• RDBMS — Relational Database Management System
• AVHRR — Advanced Very High Resolution Radiometer  
• RPC — Remote Procedure Call
• VHF — Very High Frequency
• FIFO — First In, First Out
• ASK — amplitude shift keying
• 100BASE-T2 — 100 Megabits per Second, Baseband, Two-pair Category 3 UTP cables
• ASR — Airport Surveillance Radar
• FX — Foreign Exchange
• AD — Active Directory
• SD — Standard Deviation
• DB — Decibel
• ASCII — American National Standard Code for Information Interchange
• AM — Amplitude Modulation
• NPI — New Product Introduction
• MTBF — Mean Time Before Failure
• ATF — Advanced Tactical Fighter
• ARPA — Advanced Research Projects Agency (made early internet)
• B-ICI — Broadband Inter-Carrier Interface

• XA-FR — Exchange Access Frame Relay
• ACL — Access Control List
• EBCDIC — Extended Binary Coded Decimal Interchange Code (pronounced Eb-see-dik) (cf. BCD)
• DMTS — Distinguished Member Of Technical Staff
• CPT — Carriage Paid To
• JAXA — Japan Aerospace Exploration Agency
• RAEX — Roaming Agreement EXchange
• EPA — Environmental Protection Agency (US)
• SP — Service Provider
• CU — Control Unit
• CPM — Critical Path Method
• AOA — Angle Of Arrival
• A-KEY — Authentication key
• CIS — Commonwealth of Independent States
• CBC — cipher block chaining
• DES — Data Encryption Standard
• DTX — Discontinuous Transmission
• S-BCCH — Short Message Service Broadcast Control Channel
• NATO — North Atlantic Treaty Organisation
• CDR — Call-Detail Record
• DTE — Data Terminal Equipment
• QMS — Quality Management System
• RAM — random-access memory
• DHCP — Dynamic Host Configuration Protocol
• NIH — Not Invented Here
• DFS — Distributed File System
• SLIP — Serial Line Interface Protocol
• GUI — Graphical User Interface (goo-ey)
• APIC — Advanced Programmable Interrupt Controller
• SXS — Step-By-Step
• TC — Telephone Call
• I/O — Input/Output
• URL — Universal Resource Locator
• CB — Call Back
• SWAG — Scientific Wild Ass Guess
• RU — Are You?
• UPS — Ultraviolet Photoelectron Spectroscopy
• IM — Instant Message
• CFE — Contractor-Furnished Equipment
• SME — Subject Matter Expert
• EMG — Electromyogram
• SDR — Special Drawing Rights
• GPS — Global Positioning System (ex-NAVSTAR)
• ATS — applications technology satellite
• SQA — Software Quality Assurance
• ICT — Information and Communication Technology
• X-ON — Transmitter On
• DMX — De-MultipleXer
• ACFQ — Absence Compensation Fair Queuing
• WB — Welcome Back

• AP — Application Protocol
• CMI — Computer Managed Instruction
• ATM — Adobe Type Manager
• EU — European Union (1994; formerly referred to as the EEC or EC)
• GRE — Generic Routing Encapsulation
• CIM — Corporate Information Management
• SIG — Special Interest Group
• QOS — Quality of Service
• TAC — Technical Assistance Center
• Q&A — Question & Answer
• X-OFF — Transmitter Off
• MSN — Microsoft Network
• ISO — Infrared Space Observatory
• MOB — Mobile
• USB — Universal Serial Bus
• PLMN — Public Land Mobile Network
• ISRO — Indian Space Research Organisation
• WLTF — Wireless LAN (Local Area Network) Task Force
• CM — Configuration Management
• CRL — Certificate Revocation List
• CAM — Computer-Aided Mapping
• LCP — Link Control Protocol
• RM — Resource Management
• UHF — Ultra High Frequency (300-3000 MHz; 1m-10cm)
• NMT — Nordic Mobile Telephone
• BS — Base Station
• MDA — Monochrome Display Adapter
• PAR — Precision Approach Radar
• RACON — Radar Beacon
• SAS — Statistical Analysis System
• SLF — Super Low Frequency
• CC — Carbon Copy
• TNSTAAFL — There's No Such Thing As A Free Lunch
• MAC — Message Authentication Code
• SGML — Standard Generalized Markup Language
• DIT — Directory Information Tree
• IMPACT — Integrated Manufacturing Precision Assembly Cellular Technology
• TTYL — Talk To You Later (Internet Slang)
• AAAI — American Association for Artificial Intelligence's
• FFT — Fast Fourier Transform
• MIC — Message Integrity Check
• AE — Application Entity
• PO — Purchase Order
• VIRUS — Vital Information Resources Under Siege
• ATC — Air traffic control
• VDS — Variable Depth Sonar
• AGP — Accelerated Graphics Port
• DSA — Directory System Agent
• YGWYPF — You Get What You Pay For
• TBD — To Be Determined

• OMG — Object Management Group
• H323 — ANSI standard for format over IP
• BBU — Baseband Unit
• PVT — Private
• PLD — Programmable Logic Device
• SMS — Short Message Service
• FCW — Federal Computer Week
• ACM — Association for Computing Machinery
• CCTV — Closed-circuit television
• ADPE — Automatic Data Processing Equipment
• ACE — Advanced Computing Environment
• TM — Technical Manual
• UAS — Unavailable Seconds
• NPV — Net Present Value {economics}
• EAP — Extensible Authentication Protocol
• DNS — Domain Name System
• M — Meter
• IRLAN — Infrared LAN
• VTC — Video Teleconference
• PDN — Public Data Network
• ERP — Enterprise Resource Management
• PM — Preventive Maintenance
• LEO — Low Earth Orbit (satellite communications)
• EDS — Electronic Data Systems Corporation
• CRT — Cathode Ray Tube (type of TV)
• OSS — Operational Support System
• MOS — Model Output Statistics
• TPDU — Transport Protocol Data Unit
• PNG — Portable Network Graphics (graphic file standard/extension)
• BCC — Blind Carbon Copy
• WAFB — Wireless Absolute Fairness Bound
• B3ZS — bipolar 3-zero substitution
• CDS — Cell Directory Service
• DARPA — Defense Advanced Research Projects Agency (US)
• DLR — Design Layout Record
• AT — Access Tandem
• TV — Television
• EVP — Executive Vice President
• MS — Message Store
• AF — Audio Frequency
• DC — Direct Current
• TS — Technical Specification
• DLC — Digital Loop Carrier
• BPRZ — Bipolar Return-to-Zero
• EGA — Enhanced Graphics Adapter
• ZDBOP — Ziff-Davis Benchmark Operation
• IVR — Interactive Voice Response (telephone technology)
• ACK — Acknowledge (telecommunications; Cf. NAK)
• ME — Mobile Equipment
• SDD — Software Design Document

• C-NBAP — Common Node B Application Part
• WACN ID — Wide Area Communications Network IDentifier
• AE — Account Executive
• NYSE — New York Stock Exchange
• CC — Call Control
• RCU — Remote Control Unit
• HDLC — High-Level Data Link Control
• AGC — Automatic Gain Control
• ICMP — Internet Control Message Protocol
• JIS — Japanese Industrial Standard
• DRAM — Dynamic Random Access Memory (dee-ram) (computing)
• D-NBAP — Dedicated Node B Application Part
• ABET — Accreditation Board for Engineering and Technology, Inc.
• MS — Mobile Station
• PAL — Programmable Array Logic
• IS — Intermediate System
• AML — Amplitude Modulated Link
• HSDPA — High-Speed Downlink Packet Access
• AT — Advanced Technology
• LLC — Logical Link Control
• CERT — Computer Emergency Response Team
• YP — Yellow Pages
• CIC — Circuit Identification Code
• ADF — Automatic Direction Finder
• RIP — Routing Information Protocol
• RCC — Rescue Coordination Center
• IW — Information Warfare
• FC — Fibre Channel
• P&L — Profit and Loss statement
• CBDS — Connectionless Broadband Data Service
• FDDI — Fiber Distributed Data Interface
• DT — DWDM (Dense Wavelength Division Multiplexing) Terminal
• MPI — Message Passing Interface
• EEC — European Economic Community (predecessor of the European Union|EU)
• COMJAM — Communications Jamming
• COO — Cost of Ownership
• CBT — Computer Based Training
• SEI — Software Engineering Institute
• MF — Medium Frequency
• OSI — Open Systems Interconnection (iso Standard)
• ADT — Abstract Data Type
• Z — Zero
• IETF — Internet Engineering Task Force
• VM — Virtual Machine
• RFI — Radio Frequency Interference
• CS — Cable Select
• NSF — National Sanitation Foundation
• PGP — Pretty Good Privacy (encryption)
• MHS — Microwave Humidity Sounder
• HW — Hardware

• TBD — To Be Decided
• OBO — Or Best Offer
• CIM — Common Information Model
• SEM — Space Environment Monitor
• UAX 14 — Unit Automatic eXchange type 14
• QA — Center for Quality Assurance in International Education
• WMAN — Wireless Metropolitan Area Network
• QAM — quadrature amplitude modulation
• OSPF — Open Shortest Path First (ATM)
• CLNP — ConnectionLess-mode Network Protocol
• DPC — Destination Point Code
• BCD — Binary-Coded Decimal
• IDT — Integrated Digital Terminal
• ISS — International Space Station
• LF — Low Frequency
• BBS — Bulletin Board System
• ZIP — Zone Improvement Plan
• DOD — United States Department of Defense
• TOS — Type Of Service
• FA — Functional Area
• TLS — Transport Layer Security
• RAD — Rapid Application Development
• E-LEAD — Ear Lead
• MIS — Management Information System (OSHA)
• AFC — Automatic Frequency Control
• CW — Continuous Wave
• ARP — Address Resolution Protocol (ATM)
• COO — Chief Operation Officer
• LCN — Logical Channel Number
• NSA — National Security Agency
• NEC — National Electrical Code
• AR — Access Rate
• CAM — computer aided manufacturing
• UAN — Universal Access Number
• NI — Network Interface
• CUL — See You Later
• MS — Management System
• ECN — Explicit Congestion Notification
• CABS — Carrier Access Billing System
• CHAP — Challenge Handshake Authentication Protocol (ATM)
• LSR — Local Service Request
• BT — British Telecommunications
• CAD — Computer Aided Designer
• ARPU — Average Revenue Per User
• FAQ — Frequently Asked Questions (sometimes Pronounced Fak)
• BST — British Summer Time
• SSM — Source-Specific Multicast
• EEPROM — Electrically Erasable Programmable Read-Only Memory
• PECVD — Plasma-Enhanced Chemical Vapor Deposition
• SA — Scientific American

• OTN — Optical Transport Network
• VOP — Voice Over Packet
• RFI — Request For Information. Sales department shorthand. Special priority when use in conjunction with RFN (see below).
• RDP — Radar Data Processing
• WS — Workstation
• PE — Polyethylene
• ERT — Emergency Response Team
• CU — See You
• F — Fellow
• DCE — Distributed Computing Environment
• OCR — Optical Character Recognition
• VPN — Virtual Private Network (ATM)
• DOJ — Department of Justice (US)
• E — Energy
• DIS — Distributed Interactive Simulation
• NAS — Network Access Server
• UR — Your
• DOM — Document Object Model
• 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.
• PDU — Protocol data unit (such as segment, packet, frame, etc.)
• DQPSK — Differential Quadrature Phase-Shift Keying
• DSS — Decision Support System
• RFS — Request For Service
• DQE — Detective Quantum Efficiency
• VB — Visual Basic
• IPX — Internetwork Packet Exchange
• SEC — Software Engineering Center
• ENIAC — Electronic Numerical Integrator And Computer
• SIL — Speech Interference Level
• MHS — Message Handling System (electronic)
• COM — Component Object Model
• RPM — Revolutions Per Minute, (Rotations Per Minute)
• AMI — Alternate Mark Inversion
• MS — Millisecond
• JSC — Johnson Space Center (Houston, TX)
• SOW — Statement Of Work
• STI — Speech Transmission Index
• PRF — Pulse Repetition Frequency
• DTR — Data Terminal Ready
• AS — Autonomous System
• FXO — Foreign Exchange Office
• ISDN — Integrated Services Digital Network
• RAID — Redundant Array of Inexpensive Disks
• OM — Old Man
• RTS — Request To Send
• VOD — Video On Demand
• CO — Certificate of Origin
• I.LINK — IEEE 1394, High Performance Serial Bus, implementation
• MC — Message Center
• HF — High Frequency

• PT — Project Team
• AMD — Advanced Micro Devices, Inc. (producer of computer chips)
• BRA — Basic Rate Access
• CEV — Controlled Environment Vault
• NA — Not Applicable
• EAS — Extended Area Service
• MTTR — Mean Time To Repair
• AMT — Amount
• URI — Uniform Resource Identifier
• SVC — Scalable Video Coding
• NESDIS — National Environmental Satellite, Data, and Information Service
• TEC — Total Electron Content
• IP — Intelligent Peripheral
• ATSR — Along-Track Scanning Radiometer
• DMARC — Demarcation point
• CAC — Carrier Access Code
• MVS — Multiple Virtual Storage
• ARPANET — ARPA Network
• OMS — Optical Multiplex Section
• DSSS — Direct Sequence Spread Spectrum
• AAAS — American Association for the Advancement of Science
• NTFS — New Technology File System
• COQ — Cost Of Quality
• ASR — Access Service Request
• SM — Senior Member
• RM — Regional Manager
• AU — Audio Unit
• CAA — Civil Aviation Authority
• UA — User Agent
• NOTAM — Notice to Airmen
• ZIP — Zone Information Protocol
• POP — Point Of Presence (Internet)
• ECT — Explicit Call Transfer
• AXE 10 — Series of electronic telephone exchanges from L.M. Ericsson
• RT — Remote Terminal
• UL — Uplink
• PSTN — Public Switched Telephone Network
• SPI — Service Provider Interface
• FCA — Free Carrier
• ISI — Inter-Symbol Interference
• MSR — Microwave Scanning Radiometer
• RACF — Resource Access Control Facility
• BER — Bit-Error Rate
• CGI — Computer-Generated Imagery
• JPL — Jet Propulsion Laboratory (California Institute of Technology) (NASA)
• CT — Computer Telephony
• IN — Intelligent Network
• BACP — Bandwidth Allocation Control Protocol
• MSE — Mobile Subscriber Equipment
• NLMS — Normalized Least Mean Square

• AMI — Advanced Metering Infrastructure
• IS — International Standard
• CIA — Central Intelligence Agency
• VAC — Vacant
• ROI — Return on Investment
• APC — American Power Conversion
• MSU — Microwave Sounding Unit
• TCP/IP — transmission control protocol/internet protocol
• MD — Mediation Device
• MP — Multilink Protocol
• SCP — Service Control Point
• MLS — Multiple Listing Service
• PMA — Physical Medium Attachment
• DOS — Disk Operating System
• BR — Branch
• BPR — Business Process Re-engineering
• NIC — Network Information Center
• DA — Destination Address
• CATV — Community Antenna Television
• TB — Terabyte
• ITSEC — Information Technology Security Evaluation Criteria
• GB — Gigabyte
• DS — Digital Signal
• AFSK — Audio Frequency Shift Keying
• 3G — Third Generation mobile phone network
• SOHO — Small Office Home Office
• FR — Frame Relay
• SQL — Structured Query Language
• W3C — World Wide Web Consortium
• EPR — Electron Paramagnetic Resonance
• RCV — Receive
• DMA — direct memory access (computer term)
• ACR — Attenuation Crosstalk Ratio
• AADC — Automated Area Distribution Center
• TOP — Technical Office Protocol
• PCI — Peripheral Component Interconnect
• AQL — Acceptable Quality Level
• AFP — AppleTalk Filing Protocol
• PWD — Password
• DAHDI — Digium/Asterisk Hardware Device Interface
• WPS — Wireless Priority Service
• CA — Certificate Authority
• ECO — Engineering Change Order
• DDE — Dynamic Data Exchange (in software parlance)
• WB — Write Back
• STP — Spanning Tree Protocol
• ES — Errored Second
• CRM — Customer Relationship Management
• WG — Working Group
• O&M — Operation and Maintenance

• RH — Relative Humidity
• NIS — Network Information Service
• CAN — Campus Area Network
• IRS — U.S. Internal Revenue Service
• EDVAC — Electronic Discrete Variable Automatic Computer
• T-CARRIER — Trunk Carrier
• M-CSI — Mobility management CAMEL (Customized Applications for Mobile network Enhanced Logic) Subscription Information
• ISA — Industry Standard Architecture
• LF — Line Feed
• FIPS — Federal Information Processing Standard
• LP — Low Pressure
• TN — Telephone Number
• PC — Personal computer (host)
• TRM — Technical Reference Model
• ERP — Enterprise Resource Planning
• SCTP — Stream Control Transmission Protocol
• CAB — Conformity Assessment Body
• CDMA — Code Division Multiple Access (voice/data transmission)
• BIS — Bureau of Indian Standards
• PERT — Program Evaluation and Review Technique
• STM — Short Term Memory
• P — Predicted
• TWT — Traveling Wave Tube
• RA — Risk Analysis
• SBC — Southwestern Bell Corporation
• SAIC — Science Applications International Corporation
• AFS — Andrew File System
• PUB — Publication (file name extension)
• DCP — Design Change Package
• MCU — Multipoint Control Unit
• PPB — parts per billion (109)
• LZ — Landing Zone
• DASD — Direct Access Storage Device
• DAP — Directory Access Protocol
• MDA — Model Driven Architecture
• ADEOS — ADvanced Earth Observing Satellite (Japan)
• DUP — Duplicate
• ELINT — Electronic Intelligence Satellite
• ADC — Analog-Digital Converter
• PRI — Primary Rate Interface (ISDN)
• DLL — Dynamic Link Library (computer file)
• USD — United States Dollar
• SPADATS — Space Detection And Tracking System
• BT — BlueTooth
• TE — Traffic Engineering
• JIT — Just in time
• STK — Satellite Tool Kit
• DSL — Digital Subscriber Line
• FE — Far End
• ASQC — American Society for Quality Control's

• AIS — Alarm Indication Signal
• LPC — Linear Predictive Coding
• LED — law enforcement desk; light emitting diode
• ARA — Apple Remote Access
• FCP — Fibre Channel Protocol
• SVC — Switched Virtual Connection
• M — Management
• MRC — Monthly Recurring Charge
• PGA — Programmable Gate Array
• RFO — Reason For Outage
• CAV — Constant Angular Velocity
• IIS — Internet Information Services
• PDS — Protected Distribution System
• LPE — Liquid Phase Epitaxy
• EPABX — Electronic Private Automatic Branch Exchange
• ITU — International Telecommunication Union
• KISS — Keep It Simple Stupid
• BYOD — Bring Your Own Device
• PIN — Personal Identification Number
• LD — Long Distance
• AEC — Architecture, Engineering, Construction
• NMS — Network Management System
• VLL — Virtual Leased Line
• SVD — Singular Value Decomposition
• TG — Task Group
• PAN — Personal Area Network
• SPC — Stored Program Control
• NMR — Nuclear Magnetic Resonance
• CDT — Central Daylight Time
• DCS — Digital Cross-connect System
• BNSC — British National Space Centre
• GSA — U.S. General Services Administration
• NTIA — National Telecommunications and Information Administration
• ATN — Aeronautical Telecommunication Network
• OAS — Organization of American States
• CTS — Clear To Send
• AT&T — American Telephone & Telegraph
• NCS — National Communications System
• VOL — Volume
• IEC — International Electrotechnical Commission
• WYSIWYG — What You See Is What You Get (pronounced Wizzy-wig. See Entry For Derived Acronyms)
• NIST — National Institute of Standards and Technology
• STP — Signal Transfer Point
• GDS — Global Distribution System
• SNMP — Simple Network Management Protocol (ATM)
• AMLCD — Active Matrix Liquid Crystal Display
• AEW — Airborne Early Warning
• SBC — Session Border Controller
• CF — Compact Flash
• SNR — Signal-to-Noise Ratio

• BS — Beam Splitter
• FCS — Frame check sequence (Ethernet)
• BIP — Band Interleaved by Pixel
• FITS — Flexible Image Transport System
• CMM — Capability Maturity Model
• FUP — Fair Use Policy
• OPC — Originating Point Code
• SAN — System Area Network
• MOL — Manned Orbiting Laboratory
• MCSD — Microsoft Certified Solution Developer
• EAC — Engineering Accreditation Commission
• CLI — Command line Interface (Cabletron)
• DVP — Digital Voice Privacy
• ASP — Application Service Provider
• DID — Digital Information Display
• CG — Coast Guard
• VAZO — Violating All-Zero Octet
• EOT — End Of Transmission
• T-IC — T-interConnect
• ARC — Army Reuse Center
• SCN — Switched Circuit Network
• DSTE — Digital Subscriber Terminal Equipment
• HZ — cycles per second (hertz)
• DCOM — Distributed Component Object Model
• EEG — Electro-EncephaloGram
• BSOD — Blue Screen Of Death
• ROFL — Rolling on the floor laughing
• DBS — Direct Broadcast Satellite
• Y — Yttrium
• OC — Optical Carrier
• NOAA — National Oceanic and Atmospheric Administration (US)
• ASR — Automatic Speech Recognition
• BOC — Bell Operating Company
• CNM — Customer Network Management
• DAL — Dedicated Access Line
• NLM — National Library of Medicine (National Institutes of Health)
• VLF — Very Low Frequency
• CTD — Cumulative Trauma Disorder
• AM — Activity Manager
• PD — Public Domain
• OS — Operating System
• MAC — Media Access Control
• IS — Information System
• PPP — Point-to-Point Protocol
• SSL — Secure Socket Layer
• BGP — Border Gateway Protocol (routing protocol)
• 1000BASE-T — 1000 Megabits per Second, Baseband, Twisted Pair
• ESS — Electronic Switching System
• PSD — Phase-Sensitive Detector
• OLAP — Online Analytical Processing

• CATV — Cable Television
• LEN — Line Equipment Number
• SABGW — System Architecture Evolution Gateway
• RSRQ — Reference Signal Received Quality
• ADN — Advanced Digital Network
• AOI — Area Of Interest
• ATA — Analog Telephone Adapter
• KBYTE — Kilobyte (103)
• ROSAT — Roentgen Satellite
• DDS — Digital Data Service
• ECAC — European Civil Aviation Conference
• SHF — Super High Frequency
• SIC — Standard Industrial Classification (Code)
• ELF — Extremely Low Frequency
• TLC — The Learning Channel
• HTTPS — HyperText Transfer Protocol Secure
• METRO — Metropolitan
• CSAT — Customer Satisfaction
• RFD — Request For Discussion
• TNX — Thanks
• AT&T — American Telephone and Telegraph (U.S. company, also known as "Ma Bell")
• Y — Yes
• BG — Background
• EMC — Electromagnetic Compatibility
• ECP — Encryption Control Protocol
• CIS — CompuServe Information Service
• DEC — Decimal
• DTI — Department of Trade and Industry (UK)
• TSR — Telecommunications Service Request
• TO — Technical Order
• GOS — Grade Of Service
• AAS — Adaptive Antenna System
• CMS — Content Management System
• AIN — Advanced Intelligent Network
• DC — Display Controller
• ASIC — application-specific integration circuit
• NNM — Network Node Manager
• DC — Disconnected
• MOD — Modify
• CU — Channel Unit
• EFS — Encrypting File System
• VC-ATOD — Virtual Clearinghouse on Alcohol, Tobacco and Other Drugs
• SL — Single Line
• RT — Response Time
• VC — Virtual Channel
• CB — Common Battery
• DID — direct inward dial
• FAA — Federal Aviation Agency
• DX — Duplex
• SF — Single Frequency

• NRC — National Research Council (Canada)
• PDS — Planetary Data System
• BERT — Bit Error Rate Tester (telecommunication)
• VT — Vacuum Tube
• AMHS — Automated Message Handling System
• EIP — Equipment installation procedure
• ETS — European Telecommunication Standard
• LEP — Large Electron Positron
• TE — Test Equipment
• MCD — Magnetic Circular Dichroism
• FDL — Facility Data Link
• TCO — Total Cost of Ownership
• EDD — Envelope Delay Distortion
• CBP — Coded Block Pattern
• BPS — bits per second
• CS — Convergence Sublayer (ATM)
• AS — Access System
• DCN — Design Change Notification
• DCN — Disconnect
• RT — Radiotelephone
• PBX — Private Branch eXchange (company phone system)
• HVAC — Heating, Ventilation, and Air Conditioning
• PTA — Pakistan Telecommunication Authority
• MCA — Micro Channel Architecture
• YL — Young Lady
• ASARS — Advanced Synthetic Aperture Radar System
• FCC — Federal Communications Commission (US)
• ARG — Argument
• TCSEC — Trusted Computer System Evaluation Criteria
• EDP — Electronic Data Processing Plc (London Stock Exchange [LSE])
• PS — Product Specification
• CST — Central Standard Time (UTC-6 Hours)
• SLP — Service Location Protocol
• MTSO — Mobile Telephone Switching Office
• EX — Exercise
• BTC — Botswana Telecommunications Corporation
• RTN — Regional Telecommunication Network
• ADCCP — Advanced Data Communications Control Procedures
• DNIS — Dialed Number Identification Service
• ESTEC — European Space Research and Technology Centre
• EMR — Electromagnetic Radiation
• APM — Advanced Power Management
• SAS — Special Access Surcharge
• UTC — Coordinated Universal Time
• PE — Probable Error
• AAF — Advanced Authoring Format
• DSN — Deep Space Network - network of large antennas and communication facilities.
• DIBL — Drain-induced Barrier Lowering
• A — Anode
• SAE — Society of Automotive Engineers

• SOAP — Simple Object Access Protocol
• CAM — Content Addressable Memory
• SAR — Specific Absorption Rate
• OTS — Optical Transmission Section
• 10BASE-T — 10 Megabits per second, Baseband, Twisted pair
• CRC — Contrôle de Redondance Cyclique (French: Cyclic Redundancy Check)
• TI — Time Interval
• DUC — Digital Up-Converter
• DL — Digital Library
• FCA — Free Carrier Absorption
• CER — Cell Error Ratio
• OAM&P — Operations, Administration, Maintenance & Provisioning
• NNTP — Network News Transfer Protocol
• CFO — Communication Filing Officer
• PABX — private automatic branch exchange (telephone)
• RARP — Reverse Address Resolution Protocol
• AUD — Audit
• BRI — Basic Rate Interface
• BPDU — Bridge Protocol Data Unit
• FE — Finite Element
• CCTA — Central Computer and Telecommunications Agency
• TCM — Trellis-Coded Modulation
• BS — Broadcast Satellite
• OSTP — Office of Science and Technology Policy
• NTIS — National Technical Information Service Technology Administration
• RSVD — Reserved
• DCS — Digital Cross-Connect
• LU — Logical Unit
• JVM — Java Virtual Machine
• PVC — Permanent Virtual Circuit (ATM)
• ACT — Activity
• WWAN — Wireless Wide Area Network
• E — Echo
• CDC — Connected Device Configuration
• IT — Integration Test
• BSS — Basic Service Set
• FASB — Financial Accounting Standards Board
• HDML — Handheld Device Markup Language
• PIC — Peripheral Interface Controller
• NEMA — National Electric Manufacturer's Association
• RJ-25 — Registered Jack type 25 (6-wire connector)
• LLU — Local Loop Unbundling
• C³CM — Command, Control and Communications Countermeasures
• TE — Terminal Equipment
• 9 — Nine
• DSP — Digital Signal Processor
• CO — Central Office
• QPSK — aeronautical quadrature phase shift keying
• UP — User Profile
• Q — Quadrature

• MDF — Main Distribution Frame
• MIPS — Millions of Instructions Per Second
• CMT — Cadmium Mercury Telluride
• FTTB — Fiber To The Building
• LDAP — Lightweight Directory Access Protocol (pronounced Ell-dap)
• SML/SMS — Service Management Layer/Service Management Service
• ADL — Advanced Distributed Learning
• LT — Less Than
• FR PVC — Frame Relay Permanent Virtual Connection
• KHZ — kilohertz (1000 cycles per second)
• DCS — Digital Cellular System
• CGM — Computer Graphics Metafile
• C4 — Command, Control, Communications, and Computers
• NBS — National Bureau of Standards (US)
• ECPA — Electronic Communications Privacy Act 1986
• IANA — Internet Assigned Numbers Authority
• SBU — Strategic Business Units
• PM — post meridian
• SD — Software Development
• ISAS — Institute of Space and Astronautical Sciences (Japan)
• OC-9 — Optical Carrier Signal, Level 9
• PDC — Personal Digital Cellular
• LQR — Linear Quadratic Regulator
• RTU — Remote Terminal Unit
• CFA — Carrier Facility Assignment
• FTTH — Fiber To The Home
• VOIP — Voice Over IP (Internet Protocol)
• PKI — Public Key Infrastructure (cryptography)
• NIC — Network Interface Controller
• PCM — Pulse-Code Modulation
• ADT — Atlantic Daylight Time (UTC-3 Hours)
• IV — Initialization Vector
• SML — Service Management Layer
• APS — Automatic Protection Switching (SONET/SDH)
• ECMA — European Computer Manufacturer's Association
• 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
• BIOS — Basic Input Output System
• ISSN — International Standard Serial Number (ISO 3297)
• BSS — Base Station Subsystem
• SIM — Subscriber Identity Module
• NA — Network Adapter
• TSB — Telecommunication Standardization Bureau
• ASI — Asynchronous Serial Interface
• OLE — Object Linking and Embedding (Microsoft communication protocol)
• JAN — Joint Army-Navy
• CAPS — Call Attempts Per Second
• DID — data item description
• ITP — Interactive Telecommunications Program
• SZ — Seizure
• B2C — Business-to-Consumer

• SRS — Software Requirements Specifications
• VT — Virtual Terminal
• DTMF — Dual-Tone MultiFrequency
• OC-18 — Optical Carrier Signal, Level 18
• VOA — Voice Of America
• SPM — Scanning Probe Microscope
• PM — Project Manager
• PG — Page
• PC — Peripheral Controller
• SVP — Senior Vice President
• EFIS — Electronic Flight Information System
• BIU — Bus Interface Unit
• SHA — Secure Hash Algorithm
• CIFS — Common Internet File System
• ARIN — American Registry for Internet Numbers
• EMEA — Europe, Middle East and Africa
• ACLR — Adjacent Channel Leakage Ratio
• PMP — Project Management Professional
• SA — Source Address
• PVD — Physical Vapor Deposition
• CORBA — Common Object Request Broker Architecture
• OC-256 — Optical Carrier Signal, Level 256
• UN — United Narions
• DSLAM — Digital Subscriber Line Access Multiplexer (Module)
• EEA — European Economic Area
• ISBN — International Standard Book Number (ISO 2108)
• MAI — Multiple Access Interference
• RDF — Radio Direction Finder
• CCSD — command communications service designator; control communications service designator
• NPA — Numbering Plan Area
• ACF — Access Control Field
• WTLS — Wireless Transport Layer Security
• MV — Motion Vector
• ATC — Advanced Technology Center
• ACE — Adaptive Communication Environment
• ABN — Abnormal
• SATAN — Security Administrator Tool for Analyzing Networks
• CMP — Connection Management Protocol
• AFM — Atomic Force Microscopy
• ARINC — Aeronautical Radio Incorporated
• FRS — Frame Relay Service
• TOS — Temporarily Out of Service
• C — Cost
• SRM — Scalable Reliable Multicast
• EECM — End-to-End Call Manager
• TMS — Time Management System
• SCADA — Supervisory Control And Data Aquisition
• PAP — Password Authentication Protocol (ATM)
• YYP — Yahoo Yellow Pages
• AVL — Available

• STA — State
• BOD — Bandwidth on Demand
• SB — Switchboard
• CS-PDU — Convergence Sublayer - Protocol Data Unit
• MIB — Management Information Base (ATM)
• DRM — Digital Rights Management
• CB — Citizens' Band
• BAN — Base Area Network
• FRS — Family Radio Service
• MX — Mixer
• PDT — Portable Data Terminal
• FEP — Front End Processor
• SMR — Specialized Mobile Radio
• NCSC — National Computer Security Center (NSA)
• EAI — Enterprise Application Integration
• SIL — Silence
• ISM — Industrial, Scientific and Medical
• RP — Reference Point
• UI — User Interface
• NOC — Network Operations Center
• MME — Mobility Management Entity
• EM — Electromigration
• AYT — Are You There
• RSN — Real Soon Now [which may be a long time coming]
• BS — Backing Store
• NIST — National Institute of Standards & Technology (US)
• FSK — Frequency-Shift Keying
• DDL — Digital Data Link
• BBM — Blackberry Messenger
• DPL — Digital Power Line
• B2B — Business to Businesse
• CMD — Command
• CGA — Carrier Group Alarm
• B3G — Beyond Third Generation
• CBWFQ — Class Based Weighted Fair Queueing
• BUS — Business
• TLK — Talk
• WLAN — Wireless Local Area Network
• OSCAR — Orbiting Satellite Carrying Amateur Radio
• JPEG — Joint Photographic Experts Group (24-bit image storage format)
• TAD — Telephone Answering Device
• CDA — Command and Data Acquisition
• MIDP — Mobile Information Device Profile
• CTU — Central Terminal Unit
• MTU — Maximum Transmission Unit
• CGSA — Cellular Geographic Service Area
• TTY — Teletype Telex Machine
• WIPO — World Intellectual Property Organization
• VGA — Video Graphics Array
• SPGA — Staggered Pin Grid Array

• OSHA — Occupational Safety and Health Act (1970)
• ROTFL — Roll On The Floor Laughing
• SLV — Satellite-Launch Vehicle
• VG — Voice Grade
• MMU — Memory Management Unit
• EPR — Ethylene-Propylene Rubber
• TCR — Temperature Coefficient of Resistance
• POTS — Plain Old Telephone Service (FCW)
• HTML — Hyper Text Markup Language
• SPX — Sequenced Packet Exchange
• DS-0 — Digital Signal, Level 0
• APPL — Application
• SDLC — Synchronous Data Link Control
• SW — South West
• CPC — Continous Packet Compression
• AWG — American Wire Gauge
• SIT — Static Induction Transistor
• COM — Comedy Central
• SOGA — Share of Gross Adds
• ACTV — Active
• S/D — Source/Drain
• SG — Signaling Gateway (IETF)
• ARQ — Automatic Repeat-reQuest
• E&M — ear and mouth (special signaling leads)
• TAG — Technical Advisory Group for Biological Control Agents of Weeds
• TOA — Time Of Arrival
• CQA — Certified Quality Auditor
• PU — Physical Unit (IBM)
• IP — Intellectual Property
• EFT — Electronic Funds Transfer
• D-RAM — Dynamic Random Access Memory
• FAS — Frame Alignment Signal
• NTP — Network Time Protocol
• BCH — Binary Coded Hexadecimal
• PST — Pacific Standard Time (UTC-8 Hours)
• COPS — Common Open Policy Service
• TDOA — Time Difference Of Arrival
• DL — Data Link
• AC — Area Code
• NES — Network Encryption System
• ASDE — Airport Surface Detection Equipment
• RSS — Really Simple Syndication
• SQ — Service Quality
• ODBC — Open Database Connectivity
• PPARC — Particle Physics and Astronomy Research Council
• EISA — Extended Industry Standard Architecture
• MIT — Massachusetts Institute of Technology (U.S.)
• 2W — 2-Wire
• RSVP — Resource Reservation Protocol (Internet)
• O/S — Operating System

• ES — Emergency Service
• WE — Western Electric
• PSS — Performance Support System
• DMI — Distributed Management Interface
• 100BASE-T4 — 100 Megabits per Second, Baseband, Four-pair Category 3 UTP cables
• ESF — Edge Spread Function
• ER — Extended Range
• FLM — First Line Maintenance
• STD — Subscriber Trunk Dialing
• SCM — Supply Chain Management
• ANI — Automatic Number Identification (Caller ID)
• LD — Laser Diode
• HEHO — Head End Hop Off
• FEP — Front-End Processor
• SLIC — Subscriber Line Interface Circuit
• SN — Stock Number
• SDK — Software Development Kit (Microsoft)
• MDM — Mobile Device Management
• TDM — Time Division Multiplexer
• TAM — Telephone Answering Machine
• CAP — Capability
• TSE — Toronto Stock Exchange
• 911 — Emergency Services Phone Number
• IRS — Inertial Reference System
• MIME — Multipurpose Internet Mail Extension
• CHF — Swiss Franc
• USGS — United States Geological Survey (DOI)
• WDN — Wireless Developer Network
• HSS — Home Subscriber Server
• SN — Service Number
• SPA — Software Publishers Association
• BA — Behaviour Aggregate
• ETF — Early Termination Fee
• PM — Phase Modulation
• DAP — Distributed Array Processor
• SSRC — Synchronization Source
• DPL — Digital Private-Line
• MH — Message Handler
• CPN — Cisco Powered Network
• TOVS — TIROS Operational Vertical Sounder
• E — Electra
• ECP — Engineering Change Proposals
• EMS — Express Mail Service
• SD — Speed Dial
• KAK — Key-Auto-Key
• CSC — Common Signaling Channel
• CSO — Customer Service Operations
• WPM — speech--words per minute
• T&C — Terms & Conditions
• RMS — root mean square (preferred over "RMS")

• MLP — Mobile Location Protocol
• CG — Center of Gravity (DXS)
• AIFF — Audio Interchange File Format
• P — Priority
• DNIC — Data Network Identification Code
• TELECOMMUTE — Telecommuting
• AIT — Automatic Identification Technology
• KB — Kilobyte: One thousand and twenty-four bytes kbps kilo bit per second
• EDT — Eastern Daylight Time
• RDS — Rate Determining Step
• PDN — Packet Data Network
• IPS — InPlane Switching
• IOC — Inter-Office Channel
• AN — Access Node
• CP — Call Processing
• DII — Dynamic Invocation Interface
• CI — Common Interface
• SPIN — Service Provider Identification Number
• IRS — Interface Requirements Specification
• CT — Computer Terminal
• FXS — Foreign Exchange Subscriber
• BJT — Bipolar Junction Transistor
• WPAN — Wireless Personal Area Network
• CFD — Call For Discussion
• IMP — Interface Message Processor
• AP — Action Point
• IEC — Interexchange Carrier
• DPDU — Data Protocol Data Unit
• BIS — Business Information System
• CRO — Central Records Office
• PIM — Personal Information Manager
• XPS — X-Ray Photoelectron Spectroscopy
• OFC — Office
• CAD — Computer-Aided Design
• CS — Central Station
• SDU — Signal Distribution Unit
• GMRS — General Mobile Radio Service
• CFD — computational fluid dynamics
• CIS — Computer and Information Science
• EIGRP — Enhanced Interior Gateway Routing Protocol
• ELT — Emergency Locator Transmitter
• OSP — Outside Plant
• FAT — File Allocation Table
• CGA — Color Graphics Adapter
• TTY — Text Teletype
• ESP — Encapsulating Security Payload
• PVC — Permanent Virtual Connection
• OTDOA — Observed Time Difference of Arrival
• FEC — Forward Error Correction
• WAP — Wireless Application Protocol

• SM — Service Module
• CIP — Carrier Identification Parameter
• 100BASE-T — 100 Megabits per second, Baseband, Twisted pair
• ACP — Access Control Point
• FAX — Facsimile
• TAX — Trunk Automatic Exchange
• BOFH — Bastard Operator From Hell
• VMS — Virtual Memory System
• BSS — Base Station System
• ECM — Electronic Counter Measures
• EMCON — Electromagnetic Emission Control
• EU — End User
• 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)
• WHT — Walsh-Hadamard Transform
• CBR — Constant Bit Rate
• CES — Consumer Electronics Show
• VSAT — Very Small Aperture Terminal (satellite service)
• SCU — System Control Unit
• FWA — Fixed Wireless Access
• EHF — Extremely High Frequency
• TUR — Trunk Utilization Report
• MA — Maintenance Action
• CE — Channel Element
• DM — Domain Model
• RTC — Real-Time Control
• ADC — Administration Center
• FDTD — Finite Difference Time Domain
• SPC — Statistical Process Control. Forerunning quality theory from the 1960s to TQC and TQM.
• ROS — Return on Sales
• C — Collector
• V — Variable
• ECE — Economische Commissie voor Europa (United Nations) (Dutch: Economic Commission for Europe)
• EGP — Exterior Gateway Protocol
• BMS — Business Management System
• RAN — Radio Access Network
• BMEWS — Ballistic Missile Early Warning System (bee-mews)
• EC — European Community
• CSPDN — Circuit Switched Public Data Network
• DER — Distinguished Encoding Rules
• ACAP — Application Configuration Access Protocol
• CCD — Charge Coupled Device - a device for the movement of electrical charge.
• SIA — Securities Industry Association
• SSM — Synchronization Status Message
• VOC — Volatile Organic Compounds (air pollution)
• FITL — Fiber-In-The-Loop
• AWT — Agence Wallonne des Télécommunications
• LASA — Large Aperture Seismic Array
• SDH — Synchronous Digital Hierarchy (ATM)
• WMO — World Meteorological Organization (ICSU)
• HDSL — High-bit-rate Digital Subscriber Line

• WINS — Windows Internet Name Service
• AIF — Audio Interchange Format
• IRC — International Record Carrier
• ICANN — Internet Corporation for Assigned Names and Numbers
• PCI — Personal Computer Interface
• PROM — Programmable Read-Only Memory
• T — Temperature
• SAR — synthetic aperture radar (satellite)
• DC — Device Control
• WAYP — White and Yellow Pages
• KM — Knowledge Management
• GDM — GSM (Global System for Mobile communications) Data Module
• SWAP — Shared Wireless Access Protocol
• TSO — Telecommunications Service Order
• WTO — World Trade Organisation
• DTN — Data Transfer Network
• DDD — Direct Distance Dialing
• DTD — Document Type Definition (XML)
• RMI — Remote Method Invocation
• TRS — Telecommunications Relay Service
• CVR — Crystal Video Receiver
• FOSE — Federal Office Systems Exposition
• CRIS — Carrier Route Information System
• IAT — Integrated Access Terminal
• ADN — Abbreviated Dialing Number
• ORB — Object Request Broker
• SRR — Search and Rescue Region
• LNP — Local Number Portability
• GHZ — Gigahertz
• LMS — Learning management system
• CD — Critical Dimension
• DNS — Domain Name Service
• CP — Change Proposal
• NAFTA — North American Free Trade Agreement
• B6ZS — Bipolar 6 Zero Substitution
• CAM — Common Access Method
• DCE — Data Communication Equipment
• ADT — American District Telegraph Company
• RDI — Remote Defect Indicator (UNI Fault Management)
• ASD — Alternative Service Delivery
• QDR — Quad Data Rate
• JCL — Job Control Language
• UPS — Uninterruptible Power Supply
• MTS — Message Transfer System
• JST — Japan Standard Time
• SSM — Spread Spectrum Modulation
• BSA — Business Software Alliance
• AFOSR — Air Force Office Of Scientific Research(USA)
• ADF — automatic document feeder
• WAR — Weekly Activity Report

• ASA — Acoustical Society of America
• OSS — Operations Support System
• JTF — Joint Task Force
• MGMT — Management
• AP — access point
• COMDEX — Computer Dealers Exposition
• NSS — Network Switching Subsystem
• PCMCIA — Personal Computer Memory Card International Association
• ACPI — Advanced Configuration and Power Interface
• TDMA — Time Division Multiple Access
• COO — Cell of Origin
• WAIS — Wide Area Information Server
• DAT — Digital Audio Tape
• MPI — Minimum Picture Interval
• ISOC — Internet Society
• ALT — Accelerated Life Test
• VPI — Virtual Path Identifier
• NRPB — National Radiological Protection Board
• ECR — Electronic Cash Register
• SAF — System Access Fee
• IMC — Intermediate Metal Conduit
• 2W — Two Wire
• TKIP — Temporal Key Integrity Protocol
• FH — Frequency Hopping
• IEEE — Institute of Electrical and Electronics Engineers
• ISAKMP — Internet Security Association and Key Management Protocol
• CPS — characters per second
• ASQ — Alpha System Qualification
• CONUS — Contiguous United States
• SUS — Suspension
• SIL — Solid Immersion Lens
• DCA — Dynamic Channel Assignment
• DMS — Data Management System
• MPEG — Motion Picture Experts Group
• KDC — Kerberos Key Distribution Center
• EDC — Electronic Dispersion Compensator
• NF — Noise Factor
• DGPT — Directorate General of Posts and Telecommunications
• LEC — Local Exchange Carrier
• DHD — Dial Home Device
• MBPS — Megabits per second
• HFC — Hybrid Fiber/Coaxial network
• COT — Central Office Terminal
• ALB — Analog Loopback
• VF — Voice Frequency
• CFV — Call For Vote(s)
• B-ISDN — Broadband Integrated Services Digital Network
• JRE — Java Runtime Environment
• DDN — U.S. Defense Data Network
• AOL — America on line

• PMT — Program Management Team
• OTA — Office of Technology Assessment (U.S.; abolished by Congress, Fall 1995)
• LISP — List Processing Language
• BOSS — Binary Object Storage System
• TCIC — Trunk Circuit Identification Code
• IMSI — International Mobile Subscriber Identity
• 1FB — Single line, Flat Business rate;
• AAV — Accountholder Authentication Value
• DVB — Digital Video Broadcasting
• ET — Electronic Transmission
• FTTC — Fiber To The Curb光纤到路边
• ACC — Area Control Center
• CRTS — Cellular Radio Telecommunications Service
• DUA — Directory User Agent
• QI — Quality Indicator
• IPM — Inches Per Minute
• DDU — Disk Drive Unit
• AWACS — Airborne Warning And Control System
• PP — Polypropylene
• MBWA — Mobile Broadband Wireless Access
• ST — Such That
• LATA — Local Access and Transport Area
• IRDA — Infrared Data Association
• 3GPP — Third Generation Partnership Project
• FEXT — Far-End Cross Talk
• OML — Object Model Library
• REPT — Report
• NIU — Network Interface Unit
• RNX — Restricted Numeric eXchange
• CAL — Calorie
• SNA — System Network Architecture
• DII — Defense Information Infrastructure
• NDVI — Normalized Difference Vegetation Index
• TFTP — Trivial File Transfer Protocol (ATM)
• 3-D — 3-Dimensional
• LS — Loop Start
• RCC — Radio Common Carrier
• HLR — Home Location Register
• EIA — Extended Interaction Amplifier
• CND — Calling Number Display
• MC — Maintenance Control
• COAX — Coaxial
• ILEC — Incumbent Local Exchange Carrier
• ADB — Apple Desktop Bus
• IMEI — International Mobile Equipment Identity
• CDE — Common Desktop Environment
• CMRS — Commercial Mobile Radio Service
• HEX — Hexadecimal (base 16)
• DTI — Digital Trunk Interface
• DPSK — Differential Phase Shift Keying

• 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
• DSN — Defense Switched Network
• NCSA — National Center for Supercomputing Applications
• VLSI — Very-Large-Scale Integration
• MA — Message Analysis
• DEMUX — Demultiplexer
• GI — Graded-Index
• DCS — Data Collection System (NOAA Polar Orbiting Satellites)
• RAU — Remote Access Unit
• MLM — Multi-Longitudinal Mode
• DN — Distinguished Name
• DTAP — Direct Transfer Application Process
• AOS — Alternate Operator Service
• INSAT — Indian National Satellite
• LANE — Local Area Network Emulation
• AVR — Automated Voice Response
• PAM — Payload Assist Module
• ILD — International Long Distance
• DDI — Direct Dialing Incoming
• DSS — Digital Signature Standard
• VTS — Vessel Traffic Service
• RXQUAL — Received Signal Quality
• IPS — Instructions Per Second
• RADIUS — Remote Authentication Dial-In User Service
• IRTF — Internet Research Task Force
• ALOC — Average Length Of Call
• L2TPV3 — Layer 2 Tunneling Protocol Version 3
• UDP — Up Down Pair
• MSW — Most Significant Word
• DL — Definition List
• DSI — Digital Speech Interpolation
• DCMI — Dublin Core Metadata Initiative (Online Computer Library Center)
• JDK — Java Development Kit
• BER — Basic Encoding Rules (ASN.1)
• MP — Modulation Parameter
• FGA — Feature Group A
• CMIP — Common Management Information Protocol (ATM)
• FOD — Fax on Demand
• TL1 — Transaction Language 1
• TCB — Telecommunication Certification Body
• IRQ — Interrupt Request
• FDI — Feeder Distribution Interface
• ACA — Adaptive Channel Allocation
• PACS — Personal Access Communications System
• CRV — Call Reference Value
• VPA — Valid Peripheral Address
• ICL — Inserted Connection Loss
• BLOS — Beyond Line-Of-Sight
• EMR — Electromechanical Relay
• CBEMA — Computer & Business Equipment Manufacturers Association

• DVMRP — Distance Vector Multicast Routing Protocol
• EA — Extended Address Field Bit
• VBR — Variable Bit Rate (ATM)
• SCPC — single channel per carrier
• OT — Office of Telecommunications
• NCP — Network Control Protocol
• ADC — Access Deficit Charge
• GBT — Ground Based Tower
• CIP — Channel Interface Processor
• BLER — Block Error Rate
• LIF — Logical Interchange Format
• TDD — Time Division Duplex
• COMINT — Communications Intelligence
• APDU — Application Protocol Data Units
• ABM — Asynchronous Balanced Mode
• TC — Transmission Convergence (ATM)
• LDN — Local Directory Number
• FCA — Fixed Channel Allocation
• FAC — Forced Authorization Code
• 3G — 3rd Generation Wireless Format
• DM — Differential Mode
• IG — Interface Group
• CLDC — Connected Limited Device Configuration
• IAD — Integrated Access Device
• EOB — End Of Business
• SDM — Service Delivery Management
• BAN — Building Area Network
• CMA — Communications Management Association
• CCCH — Common Control Channel
• ASEAN — Association of South East Asian Nations
• LOO — Likelihood of Occurrence
• BCH — Bose-Chaudhuri-Hocquenghem Coding
• 2G — Second Generation Wireless Systems
• SN — Switching Network
• FGD — Feature Group D
• CNG — Fax Calling Tone
• LSW — Least Significant Word
• YAHOO — You Are Hazy Over Oranges
• CRB — Cramer-Rao Bound
• AMSS — Automatic Message Switching System
• CRLF — Carriage-Return Line-Feed
• DLP — Data Link Processor
• AWG — arrayed waveguide grating
• DOT — Department of Telecommunications (India)
• SITA — Société Internationale de Télécommunications Aéronautiques
• SDP — Software Development Plan
• ACT — ACTIVITY, ACTIVITIES
• CIC — Carrier Identification Code
• SISIR — Singapore Institute of Standards and Industrial Research
• RSL — Restricted Service License

• INE — Intelligent Network Element
• IAB — Internet Architecture Board
• OOP — Object-Oriented Programming
• CPC — Calling Party Control
• NAT — Network Address Translation
• EIR — Equipment Identity Register
• SMDS — Switched Multimegabit Data Service (ATM)
• TD — Transmit Data
• RJE — Remote Job Entry
• RDT — Recall Dial Tone
• NAK — Negative Acknowledge
• PEM — Privacy-Enhanced Mail
• RRN — Routing Recording Number
• LRC — Learning Resource Center
• NC — Network Channel
• TRS — Trunked Radio Systems
• COC — Central Office Connection
• WSDL — Web Services Description Language
• CIAC — Computer Incident Advisory Capability
• EBS — Electron Bombarded Silicon
• CLK — Clock
• RICK — Repeater Interface Communications Kit
• 4GL — Fourth-Generation Language
• TT — Text-Telephone
• CDM — Conceptual Data Model
• RPV — Remotely Piloted Vehicle
• MR — Mobile Router
• SIM — Subscriber Identification Module
• AMPS — Advanced Mobile Phone Service (cellular phone standard)
• UMA — Unlicensed Mobile Access
• CCP — Compression Control Protocol
• TEI — Terminal Endpoint Identifier
• CAC — Connection Admission Control (Asynchronous Transfer Mode)
• DPT — Dynamic Packet Transport
• EBCDIC — Extended Binary-Coded Decimal Interchange Code
• UML — Unified Modeling Language (Object Management Group, OMG)
• SSN — Switched Service Network
• RMS — Resource Management System
• VLAN — Virtual Local Area Network
• UART — Universal Asynchronous Receiver/Transmitter
• RCS — Radar Cross Section
• BHCA — Busy Hour Call Attempt
• CIRC — Cross-Interleaved Reed-Solomon Code
• EEROM — Electronically Erasable Read-Only Memory
• OMF — Object Management Framework
• ISI — Intersymbol Interference
• RAU — Radio Access Unit (Army)
• DCAS — Downloadable Conditional Access System
• EVA — Electronic Video Agent
• EULA — End User License Agreement (usually in reference to software)

• NCF — Network Control Facility
• VN — Virtual Network
• BIS — Brought Into Service
• RSS — Radio Service Software (Motorola)
• MCC — Mission Control Center (JSC)
• BSC — Bi-Synchronous Communications
• TOMS — Total Ozone Mapping Spectrometer (satellite Instrument)
• POP — Post Office Protocol
• GAN — Global Area Network
• SPD — Serial Presence Detect
• NTDS — Naval Tactical Data System
• IR — International Roaming
• WFA — Wait for Answer
• RMON — Remote Monitoring
• NII — National Information Infrastructure (USA)
• ISG — Information Systems Group
• LRC — Longitudinal Redundancy Check
• HSCSD — High-Speed Circuit-Switched Data
• SOS — Save Our Souls (Help!)
• CSPRM — Common Signaling Protocols Resource Module
• TEL — Telephone
• 4W — Four-Wire
• WVOIP — Wireless Voice over Internet Protocol
• VPWS — Virtual Private Wire Service
• ALI — Automatic Location Information
• VSAT — Very Small-Aperture Terminal
• SCR — Sustainable Cell Rate
• TOP — technical/office protocol
• WARC — World Administrative Radio Conference
• MHO — My Humble Opinion
• VAS — Value Added Services
• BT — Burst Tolerance
• USA — Underground Service Alert
• BSI — British Standards Institution
• ULL — Unbundled Local Loop
• CV — Coding Violation
• ARM — Asynchronous Response Mode
• HSPA — High Speed Packet Access
• AMPS — Advanced Mobile Phone System
• FI — Format Identifier
• TCA — Threshold Crossing Alert
• FC — Frame Control
• NOAO — National Optical Astronomy Observatories (Tucson, AZ)
• SMS — Service Management System
• FMR — Follow Me Roaming
• WTS — Wireless Telecommunications Symposium
• SMB — Server Message Block
• CMOS — Complementary Metal Oxide Semiconductors
• CID — Craft Interface Device
• VLSI — Very Large-Scale Integration

• AAS — advanced automation system (FAA)
• DISN — Defense Information Systems Network
• FECN — Forward Explicit Congestion Notification (ATM)
• DDCMP — Digital Data Communications Message Protocol
• CODEC — Coder/decoder
• ARSR — Air Route Surveillance Radar
• CACH — Call Appearance Call Handling
• VBA — Visual BASIC for Applications
• ACSE — Association Control Service Element
• RGN — Region
• NIMBY — Not In My Back Yard
• AF — Assured Forwarding
• 3GPP — Third-Generation Partnership Project
• EST — Establish
• FNN — Full National Number
• LCR — Least Cost Routing
• RDBMS — Relational Data Base Management System (Oracle)
• SE — Southeast
• NFPA — National Fire Protection Association
• CCIR — International Radio Consultative Committee (French Acronym)
• RSS — root-sum-square
• DOD — Direct Outward Dialing
• CCR — Customer Controlled Reconfiguration (Sprint)
• OBC — Onboard Computer
• DSCP — Differentiated Services Code Point
• DXC — Digital Cross Connect
• SRL — Singing Return Loss
• CRS — Cell Relay Service
• CPG — Converged Packet Gateway
• STP — standard temperature and pressure (0° and 1 atm)
• NRP — Network Resource Planning
• CNG — comfort noise generation
• ATS — Automatic Transfer Switch
• ECM — Error Correction Model
• SSMA — Spread-Spectrum Multiple Access
• ASAR — Advanced Synthetic Aperture Radar 
• UMTS — Universal Mobile Telecommunications Service
• EMS — Element Management System (ATM)
• TU — Transmission Unit
• APN — An Access Point Name
• CLETS — California Law Enforcement Telecommunication System
• ATS — Abstract Test Suite
• DARTS — Design Approach for Real-Time Systems
• EBIC — Electron Beam Induced Current
• RACH — Random Access Channel
• NAS — Network-Attached Storage
• EDFA — Erbium-Doped Fiber Amplifier
• IESG — Internet Engineering Steering Group
• ASN.1 — Abstract Syntax Notation One
• RCU — Radio Control Unit

• DIS — Draft International Standard
• VHSIC — Very High-Speed Integrated Circuit
• MF — Multiple Frequency
• CHTML — Compact Hypertext Markup Language
• TACSAT — Tactical Satellite
• FTTK — Fibre To The Kerb
• PD — Pulse Duration
• CFNRY — Call Forwarding on No Reply
• MGC — Multimedia Gateway Controller
• SVC — Switched Virtual Circuit (ATM)
• DPCM — differential pulse code modulation
• DPA — Distributed-Power Architecture
• SLAM — Scanning Laser Acoustic Microscope
• YABA — Yet Another Bloody Acronym
• CTIA — Cellular Telecommunications Industry Association
• INTELSAT — International Telecommunications Satellite
• FDD — Frequency Division Duplex
• RP — Radio Port
• VXML — Voice eXtensible Markup Language
• CALEA — Communications Assistance for Law Enforcement Act
• PDL — Positioning Data Link
• RISC — Reduced Instruction Set Computing
• LB — Local Battery
• MPLS — Multi Protocol Label Switching
• CON — Concentrator
• ITT — Invitation To Tender
• OSF — Open Software Foundation
• DCF — Distributed Coordination Function
• ANC — Access Network Controller
• CSR — Customer Service Report
• FRAD — Frame Relay Access Device
• PNP — Plug-and-Play
• 4WAI — Four-Wire Analog Interface
• DACS — Digital Access Cross-connect System
• CAVE — Cellular Authentication and Voice Encryption Algorithm
• CMC — Career Management Center
• FTAM — File Transfer Access and Management
• ESCON — Enterprise System Connection
• DIL — Direct Inward Line
• SCR — System Change Request
• MAJ — Major
• ASN.1 — Abstract Syntax Notation 1
• DNSIX — Defense Network Security Information Exchange
• LI — Length Indicator
• CRBT — Caller Ring Back Tone
• ADM — Administration Building
• PCCA — Portable Computer Communications Association
• FMC — Fixed Mobile Convergence "Mobile UC or Unified Communications over Wireless"
• C3I — Command, Control, Communications & Intelligence
• ADP — Automatic Data Processor

• CC — Composite Clock (SONET)
• STMR — Sidetone Masking Rating (telecommunications)
• NREN — National Research and Education Network
• BCDIC — Binary Coded Decimal Interchange Code
• VDR — Voice Digitization Rate
• WDA — Wireless Digital Assistant
• RADIUS — Remote Authentication dial In User Service
• YA — Yet Another
• SWBD — Switchboard
• TLT — Test Loop Translator
• VESA — Video Electronics Standards Association
• OMP — Open Management Platform
• RX — Receive
• BOM — Bit-Oriented Message
• AUI — Attachment Unit Interface
• CAMA — Centralized Automatic Message Accounting
• MSDP — Multicast Source Discovery Protocol
• LPD — Low Probability of Detection
• TTYL — Type To You Later
• FEA — Finite Element Analysis
• LT — Line Termination
• WAE — Wireless Application Environment
• SIP — Session Initiation Protocol
• DTU — Data Transfer Unit
• TP — Termination Point
• TDD — Telecommunications Device for the Deaf
• GS — Ground Start
• MMM — Mobile Media Mode
• LIDB — Line Information DataBase
• MFC — Multi-Frequency Code
• POE — power over ethernetinjector
• 3G — Third Generation (mobile communication system)
• VCC — Virtual Channel Connection (ATM)
• PUK — PIN (Personal Identification Number) Unlocking Key
• VSAM — Virtual Storage Access Method
• VR — Virtual Router
• RDMA — Remote Direct Memory Access
• VCI — Virtual Channel Identifier
• ERL — Echo Return Loss
• SONET — Synchronous Optical Network
• 2G — Second generation cellular
• DA — deca
• CPAP — Customer Premises Access Profile
• TIA — Telecommunications Industry Association
• PSDN — Public Switched Digital Network
• RLU — Remote Line Unit
• SSP — Security Service Provider
• NSAI — National Standards Authority of Ireland
• ACF — Advanced Communications Function (IBM)
• CPH — Call Party Handling

• 4G — Fourth Generation Wireless Systems
• SCM — Single-Carrier Modulation
• AAL5 — ATM (Asynchronous Transmission Mode) Adaptation Layer 5
• DFG — difference-frequency generation
• PSN — Packet Switched Network
• TCC — Transmission Control Code
• RFR — Radio Frequency Radiation
• CLD — Cross-Layer Design
• CCNA — Cisco Certified Network Associated
• LAG — Link Aggregation Group
• DTE — Digital Terminal Equipment
• ETN — Electronic Tandem Network
• F — Frequency
• CTI — Computer Telephony Integration
• DRQ — Disengage Request
• CLCC — Ceramic Leaded Chip Carrier
• IPCP — Internet Protocol Control Protocol
• DPBX — Digital Private Branch Exchange
• LCF — Location Confirm
• VOB — Versioned Object Base
• ABBR — Abbreviation
• BTAM — Basic Telecommunications Access Method
• TNI — Telephone Network Interface
• EGSM — Extended Global System for Mobile Communications
• FDOA — Frequency Difference Of Arrival
• EMI — Electro-Magnetic Interference
• SAT — Satellite
• EMF — Event Management Framework
• OSA — Open System Architecture
• DE — Discard Eligibility (ATM)
• ET — Exchange Terminal
• LIM — Line Isolation Monitor
• GDK — GIMP (GNU Image Manipulation Program) Drawing Kit
• CTO — Commonwealth Telecommunications Organisation
• TBCD — Telephony Binary Coded Decimal
• VRML — Virtual Reality Modeling Language
• CAPTAIN — Character And Pattern Telephone Access Information Network
• VPX — Virtual Path Cross-Connect
• ADCCP — Advanced Data Communication Control Procedures
• WIN — Wireless Intelligent Network
• CSU — Channel Service Unit
• STN — Station
• CRBT — Color Ring Back Tone
• AT — Attenuation
• NCC — Network Control Center (GSFC)
• QS — Quasi-Synchronous
• UCF — Unregistration Confirm
• DTL — Defense Telephone Link
• TXM — Transmission X-ray Microscope
• CIP — Continuous Improvement Program

• SMI — Structure of Management Information
• VOB — Voice Over Broadband
• TSC — Test System Controller
• ESCA — photoelectron spectroscopy for chemical analysis
• FMS — Fixed Mobile Substitution
• WORM — Write-Once, Read-Many
• PET — positron emission tomography
• EM — Element Manager
• IDF — Independent Distribution Frame
• EFCI — Explicit Forward Congestion Indication (ATM)
• SSAP — Source Service Access Point
• RDT — Remote Digital Terminal
• LCP — Local Control Point
• OD — Outside Diameter
• WSFL — Web Services Flow Language
• LIS — Lightning Imaging Sensor
• TIFF — Tag Image File Format
• FPS — Framing Pattern Sequence
• IRF — Impulse Response Function
• BY — Busy
• X — X Window System
• CTE — Computer Telephony Engineer
• LSI — Large Scale Integration -> VLSI
• PLL — Phase Locked Loop
• PTT — Push to Talk Technology
• TP — Transition Point
• CPOP — Circuit Precedence Over Packet data
• DRFM — Digital Radio-Frequency Memory
• TCM — Time Compression Multiplexer
• RIPE NCC — Reseaux IP Europeens Network Coordination Centre
• ENV — Environment
• LRM — Long Reach Multimode
• PTP — Point To point Protocol
• E — Echo Time Zone
• PARC — Palo Alto Research Center
• LDP — Label Distribution Protocol
• DPDT — Double-Pole Double-Throw
• ADTM — Asynchronous Data Transfer Mode
• ADPC — Automatic Data Processing Center
• VNS — Virtual Network System
• KSU — Key Service Unit
• TP — Telephone Pole
• FSK — Frequency Shift Keying
• FOIP — Fax Over Internet Protocol
• 4WA — Four Wire Analog
• CC — Country Code
• TDWR — Terminal Doppler Weather Radar
• CPE — Customer Premise Equipment
• DQDB — Distributed Queue Dual Bus
• LLA — Link Level Access

• ARFA — Allied Radio Frequency Agency
• IMAP — Internet Mail Access Protocol
• BELLCORE — Bell Communications Research, Inc.
• DXF — Data Exchange Format
• SMPTE — Society of Motion Picture and Television Engineers, Inc.
• MCP — Microsoft Certified Professional
• UPT — Universal Personal Telecommunications
• SDSL — Symmetric Digital Subscriber Line
• PJC — Pointer Justification Count
• UAT — Universal Access Transceiver
• RCP — Right-Hand Circular Polarization
• IPLC — International Private Leased Circuit
• SCC — Specialized Common Carrier
• OMA — Open Mobile Alliance
• LBR — Low Bit Rate
• CIS — Center for Integrated Systems
• DISA — U.S. Defense Information Systems Agency
• IPVX — Internet Protocol version X
• USF — Universal Service Fund
• ECS — Encryption Control Signal
• LH — Link Handler
• BP — Block Parity
• DAS — Data Acquisition System
• LXT — Local Exchange Terminal
• ASTD — American Society of Training and Development (Alexandria, Virginia)
• TCP/IP — Transmission Control/Internet Protocol
• CSIRO — Commonwealth Scientific and Industrial Research Organization
• B2B — Business-to-Business
• NDS — Novell Directory Services
• CPS — Cycles Per Second (now Hertz)
• RECON — Reconnaissance
• DOCSIS — Data over Cable Service Interface Specification
• BNC — Bayonet Neill-Concelman
• P&A — Privacy and Authentication
• 1-ESS — x-ESS series of Electronic Switching Systems
• FCA — Free Carrier Alongside
• NE — North-East
• PBT — Polybutylene Terephthalate
• DSSSL — Document Style Semantics and Specification Language
• SS1 — Signalling System 1 (500/20 Hz tones)
• IEEE-CS — Institute of Electrical and Electronics Engineers Computer Society
• EDSX — Electronic Digital Signal Cross-Connect
• CT — Cordless Telecommunications
• VQV — Voice Quality Value
• DIV — Divisionsion
• CSP — Converged Service Platform
• CVD — Chemical Vapor Deposition
• RTC — Right to Carry
• ELFEXT — Equal-Level Far-End Cross-Talk
• IWF — Interworking Function

• TCS — Telephony Control Specification
• CCA — Carrier-Controlled Approach
• AMOLED — Active Matrix Organic Light-Emitting Diode
• VTAM — Virtual Telecommunication Access Method
• RQMT — Requirement
• TBPS — Terabits Per Second
• SCE — Service Creation Environment
• IBSS — Independent Basic Service Set
• RRC — Root Raised-Cosine
• CDVT — Cell Delay Variation Tolerance
• GERAN — GSM (Global System for Mobile communications) Edge Radio Access Network
• MTA — Message Transfer Agents (Internet)
• CCNA — Cisco Certified Network Administrator
• BASIZE — Buffer Allocation Size
• WNMS — Wireless Network Management System
• BUFR — Binary Universal Form for the Representation (of data)
• PTT — Push to Talk Taster
• FAT — Final Acceptance Testing
• DOD — Dial on Demand
• SCCS — Switching Control Center System
• COFA — Change Of Frame Alignment
• BSID — Base Station Identity
• WSA — Wireless Security Auditor
• STU — Secure Telephone Unit
• ATS — Air Traffic Services
• NE — Network Element
• AAP — Alternate Access Provider
• SPID — Service Profile Identifier
• HTML — Hyper-Text Markup Language
• ATD — Advanced Technology Demonstration
• DAC — Digital-To-Analog Converter
• AAV — Alternate Access Vendor
• CBMS — Computer-Based Message System
• PDSO — Packet Data Security Overlay
• RAD — Recorded Announcement Device
• CDM — Configuration Data Manager
• BAM — Basic Access Module
• SKU — Stockkeeping Unit
• PTP — Point to Point Transmission Service (electricity)
• TOC — Telecommunication Operations Center
• TRMM — Tropical Rainfall Measuring Mission (US-Japan)
• TTY — teletype terminal
• SRA — Seamless Rate Adaptation
• DDM — Data Distribution Manager
• CDV — Cell Delay Variation(ATM)
• BIND — Berkeley Internet Name Domain
• TDRSS — Tracking and Data Relay Satellite System
• TLP — Transmission Level Point
• ACF — Access Coordination Function
• CICS — Customer Information Control System (IBM Mainframe Software; Kicks Or C-I-C-S)

• TSDU — Transport Service Data Unit
• CM — Connection Manager
• DLCI — data link connection identifier
• SDNS — Secure Data Network System
• FR — Functional Requirement
• SETI — Search for Extraterrestrial Intelligence
• BSA — Basic Service Area
• FTTP — Fiber To The Premises
• LCAS — Link Capacity Adjustment Scheme
• WFG — Wireless Firewall Gateway
• TPS — Telephone Preference Service
• NSAP — Network Service Access Point
• UBR — Unspecified Bit Rate
• ASE — Application Service Element
• VSC — Vertical Service Code
• SMSC — Short Message Service Center
• MPU — Main Processor Unit
• WTL — Wireless Transport Layer
• VCA — Voice Connecting Arrangement
• LP — Line Pair
• CAR — committed access rate
• LRQ — Location Request
• GBPS — Gigabits per second
• FIOS — Fiber Optic Services
• AAL — ATM (Asynchronous Transmission Mode) Adaptive Layer
• HPN — Home Phone Network
• ANSI-41 — ANSI standard for mobile management
• ESPN — Entertainment and Sports Programming Network
• HSCSWD — High-Speed Circuit-SWitched Data
• ECS — Environmental Control System (Subsystem)
• SQL — Specified Quality Level
• APPC — Advanced Program-to Program Communications
• IVP — Integrated Voice Protocol
• IPRC — Intellectual Property Rights Committee
• SCH — Synchronization Channel
• AI — Adapter Interface
• WFA — Work Force Administration
• DECCO — DISA Defense Commercial Communications Office
• ATU-C — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Central office end
• DMT — Discrete Multi-Tone Technology
• PLCP — Physical Layer Convergence Procedure
• BDE — Borland Database Engine
• S/N — Signal-to-Noise ratio
• BDFB — Battery Distribution Feeder Bay
• NCAR — National Center for Atmospheric Research (US)
• B8ZS — Binary Eight Zero Substitution
• MIS — Management Information Service
• VISSR — visible and infrared spin scan radiometer (GOES)
• IDCU — Integrated Digital Carrier Unit
• MFLOPS — Millions of Floating Point Operations per Second

• MTD — Moving Target Detection
• MITI — Ministry of International Trade and Industry
• MMDS — Multichannel Multipoint Distribution Service
• CSCW — Computer-Supported Cooperative Work
• AFPS — Automatic Facility Protection Switching
• XWI — XML (extensible markup language) for Wireless Images
• GLT — Great Lakes Telecom
• 3G HSPA — Third-Generation High-Speed Packet Access
• OWS — Operator Work Station
• DPST — Double-Pole Single-Throw
• RADINT — Radar Intelligence
• CDA — Communications Decency Act's
• MAP — Mobile Application Part
• B-ISDN — Broadband ISDN
• 4 GIG — 4 Giga Intellectual Gadget
• DDLD — Direct Dial Long Distance
• DDSN — Digital Derived Services Network
• CPT — Cellular Paging Teleservice
• IDCP — Internet Device Control Protocol
• SR — Slow Release
• VLF — Vertical-Laminar-Flow
• COP — Character Oriented Protocol
• AMTI — Airborne Moving Target Indicator
• PLE — Path Length Efficiency
• PY — person-year
• GSM — Groupe Speciale Mobile
• D3 — Digital channel bank, Third generation
• DSCS — Defense Satellite Communication System
• BPSK — Binary Phase-shift Keying
• LSAP — Link Service Access Point
• ASYNC — Asynchronous
• WK — Week
• MCR — Minimum Cell Rate (ATM)
• CERN — Conseil Europeen Pour La Recherche Nucleaire
• B-CPE — Broadband Customer Premises Equipment
• DCS — Defense Communications System
• UTL — Utility
• DLL — Digital Local Line
• FSAI — Fiber Serving Area Interface
• MGCP — Multimedia Gateway Control Protocol
• CSR — Customer Service Request
• FMS — Fraud Management System
• L2TP — Layer 2 Tunneling Protocol
• CCCI — Command, Control, Communications and Intelligence
• NCOS — Network Class Of Service
• LULT — Line Unit/Line Termination
• IEEE-SA — Institute of Electrical and Electronics Engineers - Standards Association
• PTT — Push to Talk Testing
• TRX — Tandem Repeater eXchange
• SPA — Special Prorate Agreement

• DL — Downlink Message
• LMS — Location and Monitoring Service
• SPE — Synchronous Payload Envelope
• SA — Selective Availability (on GPS transmissions)
• TED — Triteal Enterprise Desktop
• LVM — Line Verification Module
• HDTV — High-Definition Television
• NMC — Network Management Center
• ANAC — An Automatic Number Announcement Circuit
• BT — Bluetooth Tablet
• TDM — Time Division Multiplexing
• CSA — Canadian Standards Association (like UL)
• BPP — Billed Party Preference
• NT — New Technology, also Windows NT
• DAF — Directory Access Function
• SDP — Session Description Protocol
• MMC — Microsoft Management Console (Microsoft)
• 100VG — 100 Voice Grade (IEEE 802.12 AnyLAN Standard)
• DS-3 — Digital Signal, Level 3
• TM — Thematic Mapper (Landsat)
• DDU — Digital Data Unit
• DMS — Defense Messaging System
• P2P — Person-to-Person
• TP — Transaction Processor
• OSD — Onscreen Display
• ALI — Automatic Location Identifier
• PM — Processable Mode
• BNCC — Base Network Control Center
• SIGTRAN — Signaling Transport
• DS0 — Digital Signal Zero
• 3GIP — Third Generation Internet Protocol
• MB — Measured Business
• CES — Circuit Emulation Service
• BSS — Broadband Switching System
• CCITT — Comit? Consultatif International T?l?graphique et T?l?phonique
• MAG — Mobile Access Gateway
• PSQM — Perceptual Speech Quality Measure
• SIO — Service Information Octet
• PIC — Programmable Interrupt Controller
• VO — Voice Only
• ISO — Independent System Operator (US) (see also TSO) Responsible for grid management, but does not own assets. (electricity)
• BAF — Bellcore AMA (Automatic Message Accounting) Format
• IDLC — Integrated Digital Loop Carrier
• MTI — Moving Target Indicator
• MSRN — Mobile Station Roaming Number
• TTL — ToS and Time-to-Live
• ATB — Above-Ground Telecommunications Backbone
• TACACS — Terminal Access Controller Access Control System
• LFACS — Loop Facility Assignment and Control System
• OXCO — Oven-Controlled Crystal Oscillator

• ESN — Electronic Serial Number
• SR — Scanning Radiometer
• FEAC — Far End Alarm and Control
• UCM — Use Case Map
• WNAP — Wireless Network Access Point
• GMSS — Global Mobile Satellite System
• SMMR — Scanning Multichannel Microwave Radiometer
• VSM — Vestigial Sideband Modulation
• STM — Synchronous Transfer Mode
• FEM — Finite Element Method
• BCIX — Berlin Commercial Internet Exchange
• LCGN — Logical Channel Group Number
• DMT — Discrete Multi-Tone
• WCDMA — Wideband Code Division Multiple Access
• SINAD — SIgnal-to-(Noise And Distortion) ratio
• TSR — Terabit Switch/Router
• LAAS — Local Area Augmentation System
• AMA — automatic message accounting
• DICOM — Digital Imaging and Communications in Medicine
• NCP — Network Control Program
• VCR — Videocassette Recorder
• GSTN — General Switched Telephone Network
• IV&V — independent verification and validation
• LSC — Link State Control
• DXI — Data Exchange Interface
• SAR — Segmentation and Reassembly (ATM)
• AMTFT — Active Matrix Thin Film Transistor
• ISC — International Switching Center
• LSP — Label Switched Path
• EV — electronvolt
• ESA — Enhanced Subscriber Authentication
• BAOC — Barring of All Outgoing Calls supplementary service
• SYM — Symmetric
• A/D — Analog-to-Digital converter
• TSGR — Transport System Generic Requirements
• ALCAP — Access Link Control Application Protocol
• HFC — Hybrid Fiber Coaxial
• NMS — NetWare Management System
• CSAR — Combat Search and Rescue
• GFC — Generic Flow Control (ATM)
• EVC — Electronic Voucher Charging
• SAPI — Service Access Point Identifier
• MTS — Message Transmission Subsystem
• FOC — Fiber-Optic Cable
• BATM — Basic Telecommunication Access Method
• AMP — amplifier / amplification
• SPT — System Page Table
• GTB — Global Telecom Brokers
• CNID — Calling Number Identification Display
• TRIG — Trigger

• N-AMPS — Narrowband Advanced Mobile Phone System
• MMSI — Maritime Mobile Service Identity
• DCEF — Distributed Cisco Express Forwarding
• CODASYL — COnference on DAta SYstems Languages
• SS7 — Signaling System 7
• AB — Answer Back
• BC — Basic Call
• BIC — Bus Interface Controller
• CLP — Cell Loss Priority (ATM)
• FGDC — Federal Geographic Data Committee's
• NFR — Near-Field Recording
• CBQ — Class-Based Queuing
• ULP — Upper Layer Protocol
• SPI — Security Parameters Index
• BHCC — Busy Hour Call Completions
• CGI — Cell Global Identity
• IOC — Interoffice Channel
• DAC — Digital to Analog Converter-Audio
• CDV — Compressed Digital Video
• CCLC — Carrier Common Line Charge
• PCS — Personal Communications Services
• CMT — Commercial Metering Transponder
• CDA — Communications Decency Act of 1996
• AECT — Association for Educational Communications and Technology's
• CAN — Controller Area Network
• URN — Uniform Resource Namespace
• L2F — Layer 2 Forwarding protocol
• ACM — Address Complete Message
• AFRINIC — African Network Information Centre
• ATCA — Advanced Telecom Computing Architecture
• ROW — Rest Of World
• TDR — Time-Domain Reflectometry
• FPLMTS — Future Public Land Mobile Telecommunications System
• SIMT — Système interbancaire marocain de télécompensation
• W-CDMA — Wideband Code Division Multiple Access
• DCC — Digital Control Channel
• CGI — Computer Graphics Interface
• NLM — NetWare Loadable Module
• SMU — Service Management Unit
• MEH — Mobile-Executed Handoff
• CVT — Circuit Validation Test
• ACEK — Authentication Encryption Key
• DECT — Digital Enhanced Cordless Telecommunication
• NEMP — Nuclear Electromagnetic Pulse
• QOI — Quality of Information
• AMR — Automated meter reading also known as Automatic Meter Reading
• PSK — Phase Shift Key
• PMMA — Polymethyl Methacrylate
• MUSIC — MUltiple SIgnal Classification
• WAR — Wireless Access Revolution

• CLASS — Cell Level ATM (Asynchronous Transfer Mode) Services Simulator
• DMT — Discrete Multi-tone Transmission
• RBS — Robbed Bit Signaling
• PIM — Protocol Independent Multicast
• RJ-14 — Registered Jack type 14 (2-wire connector)
• UNI — User-Network Interface
• COAM — Customer Owned And Maintained
• EMS — Enhanced Messaging Service
• RPCU — Radio Port Control Unit
• NICT — National Institute of Information and Communications Technology
• FFH — Fast Frequency Hopping
• CDDI — Copper Distributed Data Interface
• IPXCP — Internetwork Packet Exchange Control Protocol
• DCO — Dial Central Office
• SEM — Scanning Electron Microscopes
• CLEC — Competitive Local Exchange Carrier
• AEA — American Electronics Association's
• MAC — Message Authenticity Check
• NTU — Network Termination Unit
• CSDU — Core Service Data Unit
• VADB — Virtual Auto Dial Backup
• PSN — Public Switched Network
• PLCP — Physical Layer Convergence Protocol (ATM)
• FRF-LMI — Frame Relay Forum - Local Management Interface
• CAM — Computer-Aided Manufacturing
• FD — Full Duplex
• DACS — Digital Access and Cross-Connect System
• PMOS — P-channel Metal Oxide Semiconductor
• DLT — Delete
• NWK — Network
• CAMEL — Customized Applications for Mobile-network Enhanced Logic
• RQMTS — Requirements
• TELNET — Telecommunications Network Protocol
• CEE — Communaut? Economique Europ?enne
• CEPT — Conférence Européenne des Administrations des Postes et des Télécommunications
• BSVCI — Broadcast Signaling Virtual Channel Identifier
• SAM — Service Access Multiplexer
• WAW — Wide Area Wireless
• SMS — System Management Server
• MEECN — Minimum Essential Emergency Communication Network
• IXC — interexchange carrier
• COBE — Corporate Owned Business Only
• OIM — Operations Interface Module
• SES — Scientific and Engineering Software
• SVI — Service Interception
• OCI — object code insertion
• RCT — remote Control Terminal
• AAS — Automatic Announcement Subsystem
• Z — Zulu Time
• DW — Deep Water

• DNA — Do Not Answer
• CS — Connection Segment
• BHP — Burst Header Packet
• LMDS — Local Multipoint Distribution Service
• EPP — Enhanced Parallel Port (PC)
• ODS — Operational Data Store (knowledge management)
• RADARSAT — Radar Satellite
• RDI-L — Remote Defect Indicator - Loop
• OOK — On/Off Keying
• VGF — Voice Grade Facility
• WCMP — Wireless Control Message Protocol
• UIH — Unnumbered Information with Header check
• FTS — Federal Telecommunications System
• DNI — Data Network Interface
• SFN — Single Frequency Network
• UDT — Unreliable Data Transfer
• MLA — Modern Language Association
• TSI — time-slot interchange
• NARC — Non-Automatic Relay Center
• DUV — Deep Ultraviolet
• CU — Cooling Unit
• DNU — Do Not Use
• ANSI — Advanced Network Signaling Input
• TRLR — Trailer
• QOD — Quality of Data
• HUMAN — High-speed Unlicensed Metropolitan Area Network
• ECDIS — Electronic Chart Display Information System
• CCC — CDMA Cluster Controller
• AIS-L — Alarm Indication Signal - Line
• V — Vector
• LORAN — Long Range Aid to Navigation System
• BAN — Billing Account Number
• ATIS — Automatic Transmitter Identification System
• CQ — Communications Quality
• BT — Back Trace
• ISD — International Subscriber Dialling
• ATRAC — Adaptive Transform Acoustic Coding
• QEDI — Quod Erat Demonstrandum
• CCITT — Comite Consultatif International Telegraphique et Telephonique (now ITU-T)
• PMT — Photo Multiplier Tube
• PNP — Positive-Negative-Positive
• TSC — Technical Standards Committee
• VFL — Visual Fault Locator
• SDHLR — Super-Distributed Home Location Register
• LOP-P — Loss Of Pointer - Path
• CPN — Customer Premise Network
• DEM — Digital Elevation Model
• BTP — Business Telecom Products, Inc.
• FIFO — first-in, first-out
• TARP — Target Identifier Address Resolution Protocol

• DPNSS — Digital Private Network Signaling System
• BSRF — Basic System Reference Frequency
• DUV — Data-Under-Voice
• ZBTSI — Zero Byte Time Slot Interchange
• 3GSM — Third-generation Global System for Mobile (communications)
• NW — North West
• AEIMP — Apple Event Interprocess Messaging Protocol
• FLL — Fixed-Loss Loop
• STA — Science and Technology Agency (Japan)
• MBS — Maximum Burst Size (ATM)
• MMS — Multimedia Message Service
• DFE — Design For Environment
• MILNET — Military Network
• SDN — Software Defined Network
• CSI — Clearing Subnetwork Identification
• DLU — Digital Line Unit
• EIR — Excess Information Rate
• OCC — Occupancy
• SDCCH — Standalone Dedicated Control Channel
• DTR — Down-Time Ratio
• TCPA — Telephone Consumer Protection Act
• ILETS — International Law Enforcement Telecommunications Seminar
• ITA — Illinois Telecommunications Association
• ANT — ADSL Network Terminator
• VPC — Virtual Path Connection (ATM)
• FAW — Frame Alignment Word
• GRX — GPRS Roaming Exchange
• OC-1 — Optical Carrier Signal, Level 1
• MDCP — Media Device Control Protocol
• LQC — Line Quality Control
• MTP — Message Transfer Part
• TSD — Type Specific Driver
• RCMAC — Recent Change Memory Administration Center
• MOS — Metal Oxide Semiconductor (FET Devices)
• ATU-R — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Remote terminal end
• ECC — Emergency Communications Center
• SRS — Supported Residential Services
• SNIX — Single Noise Interference Xterminator
• RNR — Receive Not Ready
• CSP — Continuous Speech Processing
• LN — Line
• APS — Advanced Power System
• AIU — Analog Interface Unit
• LMS — Local Measured Service
• CFOT — Certified Fiber-Optic Technician
• ASAS — All-Source Analysis System
• ADM 3X — DS3 Add-Drop Multiplex
• OID — Object Interaction Diagram
• USF — Universal Server Farm
• DLE — Digital Local Exchange

• ALT — Automatic Link Transfer
• WSP — Wireless Service Provider
• APR — Alarm Processing Remote
• DBRNC — deciBel Relative to Noise in a Circuit
• CD — Committee Draft
• DNC — Do Not Call
• BCSM — Basic Call State Model
• ZD — Zero Defects
• LRB — Loop Reverse Battery
• UTP — Universal Transmission Protocol
• DLC — Digital Leased Circuit
• ADTS — Ameritech Digital Transport Service
• JSC — Joint Scientific Committee (ICSU, WCRP, and WMO)
• WBMP — Wireless Bitmap
• MBE — Molecular Beam Epitaxy
• TACS — Total Access Cellular System
• CLF — Carrier Line Failure
• PTT — Post Telegraph and Telecommunications
• AAL2 — ATM (Asynchronous Transmission Mode) Adaptation Layer 2
• HDB3 — High-Density Bipolar Three-bit substitution
• TTC — Telemetry Telecommand and Control
• LMT — Lightwave Microcell Transceiver
• CCSA — Common Control Switching Arrangement
• BB — Blackberry
• MSC — Mobile Switching Center
• ACNA — Access Customer Name Abbreviation
• NTSC — National Television Standards Committee
• LAPB — Link Access Protocol-Balanced
• AIS-V — Alarm Indication Signal - Virtual
• MDN — Mobile Directory Number
• TOMS — Telecom Operations Management System
• FOTS — Fiber Optical Transmission System
• VGC — Voice Grade Channel
• ADPCM — Adaptive Differential Pulse Code Modulation
• PRM — Performance Report Message
• ISSI — Inter-Switching System Interface
• DSU — Digital Service Unit
• ML-PPP — Multilink Point-to-Point Protocol
• ACA — Automatic Circuit Assurance
• SR — Service Request
• ARD — Automatic Ring Down
• ARPT — Autorité de Régulation des Postes et Télécommunications
• EA — expedited acknowledgement
• WWAN — wireless wide-area network
• SGS — Software Generation System
• IR — Information Request
• IOS — Internet Over Satellite
• DSP — Data Service Provider
• DLT — Digital Line Termination
• INAP — Intelligent Network Application Part

• LSMS — Local Service Management System
• AUSPI — Association of Unified Telecom Service Providers of India
• DMI — Desktop Management Interface (computing)
• USPI — Universal Serial Phone Interface
• FEBE — Far End Block Error (SONET)
• ISP — International Signaling Point
• EMV — EuroPay, MasterCard, Visa
• CAAS — Communications-as-a-Service
• DACS — Digital Access Carrier System
• MED — Manipulative Electronic Deception
• CTTC — Centre Tecnològic de Telecomunicacions de Catalunya
• SNI — Service Node Interface
• RBT — Ring Back Tone
• STM — Scanning Tunneling Microscopy
• RAI — remote alarm indication
• LIU — Line Interface Unit
• BDSL — Broadband Digital Subscriber Line
• TPF — Transmission Priority Field
• PTM — Point-To-Multipoint
• CONS — Connection-oriented Network Services
• JISC — Japanese Industrial Standards Committee
• DCA — Distributed Communications Architecture
• KEK — Key Encrypting Key
• PNE — Path Number Efficiency
• AS — Active Service
• DORA — EV-DO (EVolution-Data Optimized) standard Revision A
• PHY — Physical Layer
• NSEP — National Security Emergency Preparedness
• DMT — Digital-Discrete Multi-Tone
• LEED — Low-energy Electron Diffraction
• SFX — Special Effects
• AIS-P — Alarm Indication Signal - Path
• LRF — Laser Range Finder
• WDF — Wireless Data Forum
• JMA — Japanese Meteorological Agency
• PFE — Power Feed Equipment
• CDSL — Consumer Digital Subscriber Line
• RSN — Regional Service Network
• MAPDU — Management Application Protocol Data Unit
• SMT — station management (protocol)
• FECC-F — Forward Error Correction Count - Fast data
• MP — Master Processor
• RS-422 — Recommended Standard 422 (ANSI/EIA standard for transmitting serial data)
• * — Star, special function key
• MQFP — Metric Quad Flat Pack
• BHCA — Busy Hour Call Attempts
• SLIC — Subscriber Loop Interface Circuit
• CACM — Communications of the ACM
• C² — Command and Control
• RCF — Remote Call Forwarding

• ACU — Automatic Calling Unit
• EDGE — Enhanced Data for GSM (Global System for Mobile communication) Evolution
• AL — Alignment
• ATR — Advanced Telecommunications Research Institute
• UMTS — Universal Mobile Telecommunications Standard
• OLS — Optical Line System
• PCIA — Personal Communications Industry Association
• CALA — Customer Address Location Area
• AGCH — Access Grant Channel
• WDMW — Web Directory for Mobile and Wireless
• DF — Direction Finding or Finder
• LDI — Long Distance Interconnect
• BRAN — Broadband Radio Access Network
• MSI — Maritime Safety Information
• CSAA — Central Service Area Authority
• WPKI — Wireless Public Key Infrastructure
• EST — Electroshock Therapy
• INWATS — INward Wide Area Telecommunications Service
• RM-ODP — Reference Model for Open Distributed Processing
• PSC — Picture Start Code
• CCR — Current Cell Rate (ATMF)
• ATSC — Advanced Television Systems Committee
• RADSL — Rate Adaptive Digital Subscriber Line
• ICLD — Inter-Channel Level Difference
• JDC — Japan Digital Cellular
• TC — Technical Committee (HL7)
• ESP — Essential Service Protection
• NAP — Network Access Point
• SCO — Synchronous Connection Oriented
• BPOP — Building Point of Presence
• NSE — Network Software Environment
• LFTYR — Ley Federal de Telecomunicaciones y Radiodifusión
• VGCP — Voice Grade Channel Processor
• PTO — U.S. Patent And Trademark Office
• M/W — MicroWave
• BSSMAP — Base Station System Management Application Part
• NMC — Network Model Coverage
• ASP — Active Signaling Protocol
• DOITT — Department of Information Technology and Telecommunications
• CIPOA — Classical Internet Protocol over ATM (Asynchronous Transfer Mode)
• FEBE-F — Far End Block Error count - Fast data
• DCSS — Digital Cross-connect Systems
• DS-1 — Digital Signal, Level 1
• EADAS — Engineering and Administrative Data Acquisition System
• HTO — Hellenic Telecommunications Organisation
• TAE — Terminal Adapter Equipment
• SMG — Super Master Group
• WAWS — Washington Area Wideband System
• GSM — Global System for Mobile telecommunications
• CEPT — Conference of European Posts and Telecommunications

• MAU — Multistation Access Unit
• EC — Entropy Coding
• DORK — Disciples Of The Righteous King
• WPOP — Wireless Point-of-Presence
• BTS — Base Transceiver Station (cellular)
• RSI — Record Status Indicator
• CLOS — Clear Line Of Sight
• TCL — Transverse Conversion Loss
• TD-CDMA — Time Division - Code Division Multiple Access
• GOMP — Get Off My Phone
• LTU — Line Termination Unit
• MCPC — Multiple Channels Per Carrier
• RU — Release Unit
• UMTS — Universal Mobile Telecommunication System
• ADTS — Automated Digital Terminal System
• TR — Temporal Reference
• MEID — Mobile Equipment Identifier
• CL — cell loss
• CT — Control terminal
• GOS — Gerry Otis Simpson
• BFS — Broadcast File System
• NRZ — Nonreturn To Zero
• E2E — End-to-End
• ECTF — Enterprise Computer Telephony Forum
• CW — Call Waiting Supplementary Service
• IPTD — Internet Protocol Telephony Design
• GTXC — Global Telephone Exchange Carrier
• RYP — Russian Yellow Pages
• ADIF — Accounting Data Interchange Format
• USRT — Universal Synchronous Receiver/Transmitter
• CLI — Calling Line Identification
• CYTA — Cyprus Telecommunications Authority
• TWX — Teletypewriter Exchange (Telex)
• BTO — Betts Telecom Oklahoma
• E-TDMA — Expanded Time Division Multiple Access
• RDSS — Radio Determination Satellite Service
• DCS — Digital Cross-connect Switch
• SHR — Self-Healing Ring
• BCS — British Computer Society
• AEE — Agent Execution Environment
• HQGSM — High-Quality Global System for Mobile communications
• CAIRO — Communications Audio Interface for Remote Operations
• RLC — Radio Link Control
• SCC — Signal Conversion Circuit
• CD-ROM — Compact Disk-Read-Only Memory
• RFI — Remote File Inquiry
• DRTT — Dial Repeating Tie Trunk
• TFL — Telecom Fiji Limited
• FOE — Fiber Optic Equipment
• CPS — Customer Premises System (Bellcore)

• SLC — Service Level Contract
• NSN — National Significant Number
• VRT — Voltage Reduction Technology
• DTW — Dynamic Time Warping
• CF — Coin First Payphone
• STDM — Statistical Time Division Multiplexing
• DF — Distributing Frame
• SINS — Ship’s Inertial Navigation System
• IPCU — iPhone Configuration Utility
• VCT — Variable Cam Timing
• TMSI — Temporary Mobile Subscriber Identity
• KTS — Key Telephone System
• DCB — Digital Channel Bank (Sprint)
• WFT — Wireline Formation Test
• # — Number sign, octothorp; special function key
• RCR — Research and Development Center for Radio Systems
• FELB — Far-End Loop Back
• DEO — Digital End Office
• WCRL — Wireless Communications Research Laboratory
• MBMS — Multimedia Broadcast/Multicast Service
• CASE — Computer-Aided Software Engineering
• SGCP — Simple Gateway Control Protocol
• CMAS — Cellular Management System
• CCH — Common Channel Handler
• WGX — Wireless Gateway Switch
• SMDR — station message detail recording
• VOFR — Voice Over Frame Relay
• BANC — Broadband Access Network Coordination
• LAT — Local Area Transport (network)
• LEC — Liquid Encapsulated Czochralski
• DPDCH — Dedicated Physical Data Channel
• NESC — National Electrical Safety Code
• RSL — Request and Status Links
• CCSS6 — Common Channel Signaling System # 6
• IMTS — Improved Mobile Telephone Service
• LUNT — Line Unit Network Termination
• PTM — Packet Transport Mode
• OODBMS — Object-Oriented Database Management Systems
• SCORM — Shareable Content Object Reference Model
• PAGCH — Paging and Access Grant Channel
• TBRL — Terminal Balance Return Loss
• RZ — Return to Zero
• DRTL — Dial Repeating Tie Line
• ESG — Enhanced Service Gateway
• LR-WPAN — Low-Rate Wireless Personal Area Network
• NMC — Nortel Matra Cellular
• AA — Auto-Answer
• GOSIP — Government Open System Interconnection Profile
• WIG — Wireless Internet Gateway
• E — Exchange

• ETSI — European Telecommunications Standards Institute
• KSPS — KiloSymbols Per Second
• ICTA — Idaho Cable Telecommunications Association
• BUS — Broadcast and Unknown Server
• FWS — Fixed Wireless Services
• GOSIP — Government Open Systems Interconnection Profile
• D4 — Digital channel bank, Fourth generation
• FEBE-I — Far End Block Error count - Interleaved data
• CAL — Customer Access Line
• REA — Rural Electrification Administration (US)
• WLNP — Wireless Local Number Portability
• SAMA — Spread Aloha Multiple Access
• MEAS — Measure
• CAS — Column Address Strobe
• ADM — Administration, Office of
• IMPI — IP (Internet Protocol) Multimedia Private Identity
• EF&I — Engineering, Furnishing and Installation
• PT — Payload Type (ATM)
• WAGN — West Antarctic GPS (Global Positioning System) Network
• CDR — Common Data Rate
• MVDS — Microwave Video Distribution System
• WPBX — Wireless Private Branch Exchange
• NAM — Number Assignment Module
• CITR — Canadian Institute for Telecommunications Research
• SYNC — Synchronization
• VLR — Visitor Location Register
• DBN — Dial-Back Number
• DTU — Date/Time Update
• APS — American Protective Services
• VTIR — visible and thermal infrared radiometer
• VAD — Voice Activity Detection
• NAM — Numeric Assignment Module
• QPM — QoS (Quality of Service) Policy Manager
• CFNA — Call Forwarding No Answer
• IPC — Initial Paging Channel
• DDSD — Delay Dial Start Dial
• STD — Secondary Telecom District
• STE — Syrian Telecommunications Establishment
• 4G — Fourth Generation
• F/W — Firmware
• NSDI — National Spatial Data Infrastructure
• UVG — Universal Voice Grade
• JWP — Joint Working Party
• ARAI — Adjunct Route Application Interface
• WUP — Wired Up Privacy
• MERIS — medium-resolution imaging spectrometer
• ETSI — European Telecommunications Standard Institute
• AH — Authentication Header
• RLS — Recursive Least Squares
• ASA — Avaya Site Administration

• DE — Discard Eligible
• BTL — Bell Telephone Laboratories, Inc.
• PSLV — Polar Satellite Launch Vehicle (Indian Space Research Organization; India)
• AT — Access Terminal
• DMB — Disconnect and Make Busy
• SDLC — Systems Development Life Cycle
• RANAP — Radio Access Network Application Part
• EGPRS — Enhanced General Packet Radio Service
• CARS — Community Antenna Relay Service
• VAB — Vehicle Assembly Building
• MM — Multimode (fiber optic cable)
• WTIA — Wireless Technology Industry Association
• CVSD — Continuous Variable Slope Detection
• UTRAN — UMTS (Universal Mobile Telecommunication System) Terrestrial Radio Access Network
• DECT — Digital Enhance Cordless Telecommunications
• VCC — Voice Call Continuity
• M2M — Multipoint-to-Multipoint
• IRAC — Interdepartment Radio Advisory Committee
• MRCA — Most Recent Common Ancestor
• ILETS — Idaho Law Enforcement Telecommunication System
• MOD — Modulo
• QPA — Quality Performance Analysis
• NDIS — Network Driver Interface Specification (Microsoft Windows NT)
• EFRC — Enhanced Full Rate Codec
• SARTS — Switched Access Remote Test System
• AFI — Authority and Format Identifier
• SM OFC — Single-Mode Optical Fiber Cable
• TPSP — Third Party Service Provider
• PPCH — Packet Paging Channel
• DCMES — Dublin Core Metadata Element Set
• TME — Telocator Message Entry
• JWG — Joint Working Groupof
• CMOS — Cellular Management Operation System
• SASL — Simple Authentication and Security Layer
• OC-96 — Optical Carrier Signal, Level 96
• LBX — Low Bandwidth X
• DPT — Dial Pulse Terminate
• ATMS — automatic transmission measuring system
• 4WE&M — Four-Wire Ear and Mouth
• DFRI — Datacom Reference Frame Input
• TP-PMD — Twisted Pair Physical Medium Dependent
• TANE — Telephone Association of New England
• APTC — Atlantic Provinces Telecommunications Council
• MOC — Maintenance and Operations Console
• MIN — Mobile Identification Number
• UDC — Universal Digital Channel
• MOA — Managed Object Agent
• ICI — Interexchange Carrier Interface
• GPBX — Global Private Branch eXchange
• WTP — Wireless Transaction Protocol

• EC — Echo Cancelling
• CM — Common Mode
• ACL — Asynchronous Connection-less Link
• RFA — Recurrent Fault Analysis
• BSC — Base Station Controller
• EDT — European Deaf Telephone
• THL — Trans-Hybrid Loss
• PSO — Professional Services Organization
• COI — Community of Interest
• AVT — Audio Visual Telecommunications
• VHM — Voice Health Monitor
• BS — Busy Season
• CMM — Calls, Minimums, Maximums
• MMC — Minimum Monthly Charge
• MIC — Management Integration Consortium
• UPC — Usage Parameter Control
• TTIL — Team Telecom International Ltd.
• LSI — Large-Scale Integration
• CTIT — College of Telecommunications and Information Technology
• BHA — Busy Hour Attempts
• CNE — Certified Novell Engineer
• PTI — Payload Type Indicator
• AFIPS — American Federation of Information Processing Societies
• LQR — Line Quality Report
• SMAS — Service Management System
• CTSO — Cellular Telephone Service Order
• D/I — Drop and Insert
• TRANS — Transaction
• IBS — In-Building Solutions
• LSAP — Link Layer Service Access Point
• HPPI — High-Performance Parallel Interface
• ACL — Average Call Length
• BTN — Billing Telephone Number
• NSM — Network Status Monitor
• DOV — Data-Over-Voice
• CAE — Common Application Environment
• PMD — Physical Media-Dependent
• LTU — Line Terminating Unit
• RS — Receive Signature
• ESDS — Electrostatic Discharge Sensitive
• SVW — Sioux Valley Wireless
• DM — Design Manager
• APTG — Asia Pacific Telecom Group
• GTM — Go to Meeting
• ESM — electronic support measure
• RDI-P — Remote Defect Indicator - Path
• RSS — Received Signal Strength
• AGPS — Assisted Global Positioning System
• HSC — High Speed Connect
• NECA — National Exchange Carrier Association

• NARSAP — National Advanced Remote Sensing Application Program
• EEHO — Either End Hop Off
• DTU — Data Terminal Unit
• LRF — Location Registration Function
• IDSL — ISDN (Integrated Services Digital Network) Digital Subscriber Line
• ITOC — Independent Telephone Operating Company
• SMASE — Systems Management Application Service Element
• FRAD — Frame Relay Assembler/Disassembler
• SSU — Synchronization Supply Unit
• LSF — Line Spread Function
• CR — Connection Request
• SM — Statistical Multiplexing
• DMNG — Digital Mobile News Gathering
• CSL — component sublayer
• CTE — Computer Telephony Engine
• UNO — Universal Network Operations
• SACS — Security Access Control System
• CLIP — Caller Line Identification Presentation
• BMAS — Business Management System
• ACMA — Atlantic Cable Maintenance Agreement
• DISA — Direct Inward Switch Access
• MHL — Mobile High-definition Link
• TVRO — Television Receive-Only
• BABT — British Approvals Board for Telecommunications
• DX — Duplex Signaling
• TON — IEEE/ACM Transactions On Networking
• DVCC — Digital Verification Color Code
• VC — Virtual Circuit (ATM)
• FCFS — First-Come, First-Served
• UPS — Un-interruptable Power Supply
• CALS — Computer Aided Acquisition and Logistic Support
• LOB — Line Of Bearing/Balance
• SLIP — Serial Line Internet Protocol
• WDRM — Wireless Design Reference Manual
• IPR — Intellectual Property Right
• AAV — Alternative Access Vendor
• ZLE — Zero-Latency Enterprise
• OST — Office of Science and Technology
• DACS — Digital Access Cross-Connect Switch
• DTS — Digital Terminal Systems
• SUBT — Subscriber Terminal
• DUNCE — Dial-Up Networking Connection Enhancement
• TJB — Telephone Junction Box
• 888 — Freephone
• WEDE — Wireless Enterprise Delivery Environment
• IDEN — Integrated Dispatch Enhanced Network
• AFCEA — Armed Forces Communications and Electronics Association's
• FEFA — Far End Failure
• DBF — Digital Beam-Forming
• SVC — Single Voice Coil

• TSAU — Time Slot Access Unit
• AI — Airborne Interception
• TACSIM — Tactical Simulation (Simulator)
• NPSI — Network Packet Switching Interface
• WTA — Wireless Telephony Application
• CNI — Calling Number Identification
• TPC — The Phone Company
• RJ-11 — Registered Jack type 11 (4-wire connector)
• BCM — Bit Compression Multiplexer
• IVI — Intel Video Interactive
• MRT — Medical Response Team
• MNOC — Mobile Network Operation Center
• ATTRA — Appropriate Technology Transfer for Rural Areas
• DPCM — Differential Pulse Code Modulator
• QR — Quality record