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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
• SYN — Synchronous
• EBITDA — Earnings before Interest, Taxes, Depreciation and Amortization
• ECG — Electrocardiogram
• LAN — Local Area Network
• CT — Computed Tomography
• GFSK — Gaussian Frequency Shift Keying
• CSR — Customer Service Representative
• CSMA/CA — Carrier Sense Multiple Access/Collision Avoidance
• CSMA/CD — Carrier Sense Multiple Access with Collision Detection
• ETA — Estimated Time of Arrival
• CONG — Congestion message
• CSMA/CD — Carrier sense multiple access / collision detection
• CSMA — Carrier Sense Multiple Access
• APR — Annual Percentage Rate
• IQ — Intelligence Quotient
• ISAR — Inverse Synthetic-Aperture Radar
• DAM — Diagnostic Acceptability Measure
• D-H — Diffie-Hellman
• YMMV — Your Mileage May Vary
• MLS — Microwave Landing System
• YTD — Year To Date
• DWDM — Dense Wavelength-Division Multiplexing
• ADM — Add-Drop Multiplexer
• FTP — File Transfer Protocol
• BRDF — Bidirectional Reflectance Distribution Function
• ROM — Read-Only Memory
• OIC — Oh I See
• FDIC — Federal Deposit Insurance Corporation
• MAN — Metropolitan Area Network
• ISO — In Search Of
• DSC — Differential Scanning Calorimetry
• LASER — Light Amplification By Stimulated Emission Of Radiation (cf. Maser)
• XML — Extensible Markup Language
• ASAP — As Soon As Possible (pronounced AY-sap)
• IT — Information Technology
• CPE — Customer Premises Equipment
• AUP — Acceptable Use Policy
• CPU — Central Processing Unit
• ANSI — American National Standards Institute, Inc.
• TEMIP — Telecommunications Management Information Platform
• ECU — Electronic Control Unit
• WWW — World Wide Web
• LED — Light-Emitting Diode

• DAC — Discretionary Access Control
• BBS — Bulletin Board Service
• TNYWR — The Number You Will Receive
• F2F — Face To Face (also Meeting In Person)
• RDF — Resource Description Framework
• BVR — Beyond Visual Range
• IAMAI — Internet and Mobile Association of India
• IRC — Internet Relay Chat
• RF — Radio Frequency
• CUG — Closed User Group
• UK — United Kingdom of Great Britain and Northern Ireland
• RFQ — Request For Quotation
• CDR — Critical Design Review
• DND — Do Not Disturb
• DSCP — Differentiated Services Control Point
• BTW — By The Way
• DBORS — Data Base of Records
• FEMA — Federal Emergency Management Agency
• ATOM — Any Transport over MPLS (Multi-Protocol Label Switching)
• WTG — Way To Go
• CSA — Canadian Space Agency
• OEM — Original Equipment Manufacturer (usually in reference to car parts)
• VIP — Very Important Person
• CCM — counter-countermeasure
• UDP — User Datagram Protocol (FDDI related)
• QC — Quality Control
• MBR — Master Boot Record
• ACC — Adaptive Cruise Control
• SAR — Search And Rescue
• CCSDS — Consultative/Consultative Committee for Space Data Systems
• AFAIK — As Far As I Know
• ISO — International Organization for Standardization
• BIP — Bit-Interleaved Parity
• ACK — ACKnowledgment
• EAP — Employee Assistance Program
• LCD — Liquid Crystal Display
• ESA — European Space Agency
• AATSR — Advanced Along-Track Scanning Radiometer
• DFD — Displaced Frame Difference
• IP — Internet Protocol
• PDR — Preliminary Design Review
• C4I — Command, Control, Communications, Computers, & Intelligence
• WEP — Wired Equivalent Privacy
• EDI — Electronic Data Interchange
• WML — Wireless Markup Language
• DBMS — Database Management System
• ABI — Application Binary Interface
• IRL — In Real Life
• AC — Alternating Current
• FET — Field Effect Transistor

• CCB — Change Control Board
• GSM — Global System for Mobile Communications
• LRJ — Location Reject
• ATM — Automatic Teller Machine
• QFSK — Quadrature Frequency Shift Keying
• BUR — Bandwidth Usage Redundancy
• CD — Compact Disc
• NOS — Network Operating System
• WDM — Wavelength Division Multiplexing (fiber optics)
• LRU — Line Replaceable Unit
• ACE — Access Control Entry
• WWW3 — World Wide Web Consortium
• CY — Calendar Year
• RPI — Retail Price Index
• RWR — Radar Warning Receiver
• IRR — Internal Rate of Return
• ACH — Automated Clearing House
• FAR — Federal Aviation Regulation
• CV — Curriculum Vitae
• VM — Voice Mail
• ATTN — Attention
• ASA — American Standards Association
• MB — Megabyte
• POC — Point Of Contact
• GATT — General Agreement on Tariffs and Trade (government)
• NFS — Network File System
• AES — Advanced Encryption Standard
• MMS — Multimedia Messaging Service
• COB — close of business (End of duty day)
• CAUCE — Coalition Against Unsolicited Commercial Email
• EIS — Executive Information System
• ALC — Automatic Level Control
• CS — Computer Science
• ISP — Internet Service Provider
• 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.
• SMTP — Simple Mail Transfer Protocol
• DDD — Direct Distance Dial
• BPM — Beats Per Minute
• HTTP — Hypertext Transfer Protocol
• PDH — Plesiochronous Digital Hierarchy
• RFP — Request For Proposal
• DSA — Digital Signature Algorithm
• EOM — End Of Message
• STS — Space Transportation System
• Y2K — Year 2000
• CGI — Common Gateway Interface
• PDA — Personal Digital Assistant
• APT — Automatic Picture Transmission
• ATA — Area Transportation Authority
• NMSE — Normalized Mean Square Error

• CEO — Chief Executive Officer
• TQM — Total Quality Management
• GIS — Geographic Information System
• ADD — Addendum
• SDMA — Space Division Multiple Access
• AAC — Advanced Audio Coding
• LLC — Limited Liability Company
• EFF — Electronic Frontier Foundation
• ACD — Automatic Call Distributor
• ASME — American Society of Mechanical Engineers
• VAT — Value Added Tax
• MOU — Memorandum of Understanding (an MOU between Food & Drug Administratin and a regulatory agency in another country allows mutual recognition of inspections)
• AES — Auger Electron Spectroscopy
• R&D — Research & Development
• PPM — parts per million
• DMSP — Defense Meteorological Satellite Program (U.S.)
• ADR — Address
• ATM — Asynchronous Transfer Mode
• CCIS — Common Channel Interoffice Signaling
• DME — Distance Measuring Equipment
• WAN — Wide Area Network
• SCSI — Small Computer System Interface
• ADM — Add/Drop Multiplexer
• MST — Mountain Standard Time
• GPRS — General Packet Radio Service
• BRB — Be right back
• DDL — Data Definition Language
• ADSL — Asymmetric Digital Subscriber Line
• AME — Amplitude Modulation Equivalent
• COR — Carrier Operated Relay
• PDT — Pacific Daylight Time
• UAV — Unmanned Aerial Vehicle
• EW — Electronic Warfare
• MRI — Magnetic Resonance Imaging
• X-BAR — Crossbar telephone exchange
• ABR — Available Bit Rate
• CR — Carriage Return
• SAN — Storage Area Network
• NIC — Network Interface Card
• AC — Access Control
• RNC — Radio Network Controller
• API — Application Programming Interface
• BSD — Berkeley Software Distribution
• CAE — Computer-Aided Engineering
• THX — Thanks
• VVX — Voice and Video eXchange
• TCB — Trusted Computing Base
• WBS — Work Breakdown Structure
• BECN — Backward Explicit Congestion Notification
• QI — Quality Improvement

• AIS — Automated Information System
• PSK — phase-shift keying
• PDF — Portable Document Format (created by Adobe Acrobat)
• RFC — Request For Comment
• PUHU — Pick Up Hang Up
• WWW — World Weather Watch
• EST — Eastern Standard Time
• AVHRR — Advanced Very High Resolution Radiometer  
• HSD — High Speed Data
• ASR — Airport Surveillance Radar
• VR — Virtual Reality
• S X S — Step-by-Step
• BTU — British Thermal Unit
• PCB — printed circuit board
• SCC — Standards Council of Canada
• AIR — Account Information and Refill
• AM — Ante Meridian
• TCP — Transmission Control Protocol
• SRAM — Static Random Access Memory (ess-ram)
• RPC — Remote Procedure Call
• CIR — Committed Information Rate (Frame Relay)
• ASK — amplitude shift keying
• NPI — New Product Introduction
• DB — Decibel
• ATCRBS — Air Traffic Control Radar Beacon System
• ABC — activity based costing
• SP — Service Provider
• 100BASE-T2 — 100 Megabits per Second, Baseband, Two-pair Category 3 UTP cables
• FAA — Federal Aviation Administration
• IPO — Initial Public Offering
• RDY — Ready
• ATF — Advanced Tactical Fighter
• AD — Active Directory
• CIO — Chief Information Officer
• CPT — Carriage Paid To
• ASTM — American Society for Testing and Materials (Philadelphia, Pennsylvania)
• CBC — cipher block chaining
• APIC — Advanced Programmable Interrupt Controller
• CDR — Call-Detail Record
• EC — European Commission
• ARPA — Advanced Research Projects Agency (made early internet)
• CU — Control Unit
• DFS — Distributed File System
• XA-FR — Exchange Access Frame Relay
• CFE — Contractor-Furnished Equipment
• DTX — Discontinuous Transmission
• JAXA — Japan Aerospace Exploration Agency
• SLA — Service Level Agreement
• TC — Telephone Call
• ACL — Access Control List

• VHF — Very High Frequency
• CB — Call Back
• DTE — Data Terminal Equipment
• RU — Are You?
• AOA — Angle Of Arrival
• SD — Standard Deviation
• DHCP — Dynamic Host Configuration Protocol
• DMTS — Distinguished Member Of Technical Staff
• ATM — Adobe Type Manager
• ACFQ — Absence Compensation Fair Queuing
• RDBMS — Relational Database Management System
• AP — Application Protocol
• I/O — Input/Output
• IM — Instant Message
• UPS — Ultraviolet Photoelectron Spectroscopy
• FX — Foreign Exchange
• CMI — Computer Managed Instruction
• DMX — De-MultipleXer
• DOA — dead on arrival
• AM — Amplitude Modulation
• CIM — Corporate Information Management
• EBCDIC — Extended Binary Coded Decimal Interchange Code (pronounced Eb-see-dik) (cf. BCD)
• EMG — Electromyogram
• MTBF — Mean Time Before Failure
• JV — Joint Venture
• RAEX — Roaming Agreement EXchange
• CPM — Critical Path Method
• EPA — Environmental Protection Agency (US)
• WB — Welcome Back
• GRE — Generic Routing Encapsulation
• NIH — Not Invented Here
• ASCII — American National Standard Code for Information Interchange
• S-BCCH — Short Message Service Broadcast Control Channel
• DES — Data Encryption Standard
• SIG — Special Interest Group
• CIS — Commonwealth of Independent States
• BS — Base Station
• NATO — North Atlantic Treaty Organisation
• TAC — Technical Assistance Center
• ATS — applications technology satellite
• CAM — Computer-Aided Mapping
• B-ICI — Broadband Inter-Carrier Interface
• SLIP — Serial Line Interface Protocol
• NMT — Nordic Mobile Telephone
• FIFO — First In, First Out
• QMS — Quality Management System
• SQA — Software Quality Assurance
• ISO — Infrared Space Observatory
• CM — Configuration Management
• PLMN — Public Land Mobile Network

• X-ON — Transmitter On
• SME — Subject Matter Expert
• Q&A — Question & Answer
• USB — Universal Serial Bus
• RM — Resource Management
• VIRUS — Vital Information Resources Under Siege
• MDA — Monochrome Display Adapter
• TNSTAAFL — There's No Such Thing As A Free Lunch
• LCP — Link Control Protocol
• MAC — Message Authentication Code
• GUI — Graphical User Interface (goo-ey)
• MIC — Message Integrity Check
• CRL — Certificate Revocation List
• RAM — random-access memory
• ISRO — Indian Space Research Organisation
• BBU — Baseband Unit
• MSN — Microsoft Network
• GPS — Global Positioning System (ex-NAVSTAR)
• IMPACT — Integrated Manufacturing Precision Assembly Cellular Technology
• MOB — Mobile
• X-OFF — Transmitter Off
• FCW — Federal Computer Week
• A-KEY — Authentication key
• DIT — Directory Information Tree
• URL — Universal Resource Locator
• TM — Technical Manual
• CC — Carbon Copy
• DSA — Directory System Agent
• UAS — Unavailable Seconds
• QOS — Quality of Service
• SGML — Standard Generalized Markup Language
• MOS — Model Output Statistics
• M — Meter
• EAP — Extensible Authentication Protocol
• PAR — Precision Approach Radar
• ICT — Information and Communication Technology
• SDR — Special Drawing Rights
• UHF — Ultra High Frequency (300-3000 MHz; 1m-10cm)
• VDS — Variable Depth Sonar
• PLD — Programmable Logic Device
• TPDU — Transport Protocol Data Unit
• MS — Message Store
• VTC — Video Teleconference
• OSS — Operational Support System
• AGP — Accelerated Graphics Port
• RACON — Radar Beacon
• AAAI — American Association for Artificial Intelligence's
• AT — Access Tandem
• FFT — Fast Fourier Transform
• CC — Call Control

• ADPE — Automatic Data Processing Equipment
• ATC — Air traffic control
• BCC — Blind Carbon Copy
• TS — Technical Specification
• DLR — Design Layout Record
• BPRZ — Bipolar Return-to-Zero
• TV — Television
• HDLC — High-Level Data Link Control
• TTYL — Talk To You Later (Internet Slang)
• ME — Mobile Equipment
• DLC — Digital Loop Carrier
• AF — Audio Frequency
• MS — Mobile Station
• EGA — Enhanced Graphics Adapter
• SMS — Short Message Service
• EU — European Union (1994; formerly referred to as the EEC or EC)
• CDS — Cell Directory Service
• B3ZS — bipolar 3-zero substitution
• OMG — Object Management Group
• DNS — Domain Name System
• PO — Purchase Order
• YP — Yellow Pages
• RCU — Remote Control Unit
• EDS — Electronic Data Systems Corporation
• AT — Advanced Technology
• YGWYPF — You Get What You Pay For
• AML — Amplitude Modulated Link
• IS — Intermediate System
• DT — DWDM (Dense Wavelength Division Multiplexing) Terminal
• DARPA — Defense Advanced Research Projects Agency (US)
• AGC — Automatic Gain Control
• DC — Direct Current
• FC — Fibre Channel
• COMJAM — Communications Jamming
• CERT — Computer Emergency Response Team
• CBDS — Connectionless Broadband Data Service
• RCC — Rescue Coordination Center
• ACM — Association for Computing Machinery
• MPI — Message Passing Interface
• IW — Information Warfare
• SDD — Software Design Document
• ICMP — Internet Control Message Protocol
• SAS — Statistical Analysis System
• TBD — To Be Decided
• PAL — Programmable Array Logic
• VM — Virtual Machine
• ACO — Additional Call Offering
• H323 — ANSI standard for format over IP
• JIS — Japanese Industrial Standard
• LLC — Logical Link Control

• AE — Application Entity
• CCTV — Closed-circuit television
• Z — Zero
• PM — Preventive Maintenance
• LEO — Low Earth Orbit (satellite communications)
• OSI — Open Systems Interconnection (iso Standard)
• FDDI — Fiber Distributed Data Interface
• SEM — Space Environment Monitor
• EVP — Executive Vice President
• PNG — Portable Network Graphics (graphic file standard/extension)
• SWAG — Scientific Wild Ass Guess
• MHS — Microwave Humidity Sounder
• CS — Cable Select
• ACE — Advanced Computing Environment
• MF — Medium Frequency
• TBD — To Be Determined
• ADT — Abstract Data Type
• LCN — Logical Channel Number
• WMAN — Wireless Metropolitan Area Network
• FA — Functional Area
• CIC — Circuit Identification Code
• HW — Hardware
• IDT — Integrated Digital Terminal
• ABET — Accreditation Board for Engineering and Technology, Inc.
• DPC — Destination Point Code
• RIP — Routing Information Protocol
• BCD — Binary-Coded Decimal
• ADF — Automatic Direction Finder
• CABS — Carrier Access Billing System
• CLNP — ConnectionLess-mode Network Protocol
• WACN ID — Wide Area Communications Network IDentifier
• UAN — Universal Access Number
• IVR — Interactive Voice Response (telephone technology)
• AE — Account Executive
• SA — Scientific American
• ACK — Acknowledge (telecommunications; Cf. NAK)
• ISS — International Space Station
• NPV — Net Present Value {economics}
• ARPU — Average Revenue Per User
• RAD — Rapid Application Development
• DRAM — Dynamic Random Access Memory (dee-ram) (computing)
• AR — Access Rate
• UR — Your
• CIM — Common Information Model
• PDN — Public Data Network
• LF — Low Frequency
• SSM — Source-Specific Multicast
• AFC — Automatic Frequency Control
• QAM — quadrature amplitude modulation
• HSDPA — High-Speed Downlink Packet Access

• PVT — Private
• MS — Management System
• DIS — Distributed Interactive Simulation
• RFI — Radio Frequency Interference
• ECN — Explicit Congestion Notification
• LSR — Local Service Request
• SEC — Software Engineering Center
• OSPF — Open Shortest Path First (ATM)
• CRT — Cathode Ray Tube (type of TV)
• CUL — See You Later
• F — Fellow
• NSF — National Sanitation Foundation
• TOS — Type Of Service
• EEPROM — Electrically Erasable Programmable Read-Only Memory
• CW — Continuous Wave
• NSA — National Security Agency
• SEI — Software Engineering Institute
• ZDBOP — Ziff-Davis Benchmark Operation
• E — Energy
• TLS — Transport Layer Security
• CHAP — Challenge Handshake Authentication Protocol (ATM)
• C-NBAP — Common Node B Application Part
• COO — Cost of Ownership
• NI — Network Interface
• VOP — Voice Over Packet
• AMI — Alternate Mark Inversion
• VB — Visual Basic
• D-NBAP — Dedicated Node B Application Part
• DCE — Distributed Computing Environment
• RFS — Request For Service
• WS — Workstation
• OBO — Or Best Offer
• CEV — Controlled Environment Vault
• OTN — Optical Transport Network
• BBS — Bulletin Board System
• FM — frequency modulation
• AS — Autonomous System
• FXO — Foreign Exchange Office
• NYSE — New York Stock Exchange
• MC — Message Center
• P&L — Profit and Loss statement
• ARPANET — ARPA Network
• CAC — Carrier Access Code
• VOD — Video On Demand
• DQPSK — Differential Quadrature Phase-Shift Keying
• IETF — Internet Engineering Task Force
• CO — Certificate of Origin
• JSC — Johnson Space Center (Houston, TX)
• IP — Intelligent Peripheral
• ZIP — Zone Improvement Plan

• HF — High Frequency
• ARP — Address Resolution Protocol (ATM)
• IPX — Internetwork Packet Exchange
• ASR — Access Service Request
• PE — Polyethylene
• TEC — Total Electron Content
• DOM — Document Object Model
• EAS — Extended Area Service
• DTR — Data Terminal Ready
• SM — Senior Member
• UAX 14 — Unit Automatic eXchange type 14
• ATSR — Along-Track Scanning Radiometer
• RTS — Request To Send
• NEC — National Electrical Code
• URI — Uniform Resource Identifier
• SVC — Scalable Video Coding
• MS — Millisecond
• COM — Component Object Model
• ERT — Emergency Response Team
• DQE — Detective Quantum Efficiency
• STI — Speech Transmission Index
• OM — Old Man
• RDP — Radar Data Processing
• AMT — Amount
• BRA — Basic Rate Access
• DSSS — Direct Sequence Spread Spectrum
• MSE — Mobile Subscriber Equipment
• SPI — Service Provider Interface
• NAS — Network Access Server
• BACP — Bandwidth Allocation Control Protocol
• PECVD — Plasma-Enhanced Chemical Vapor Deposition
• BT — British Telecommunications
• UA — User Agent
• PGP — Pretty Good Privacy (encryption)
• DMARC — Demarcation point
• CBT — Computer Based Training
• AU — Audio Unit
• NOTAM — Notice to Airmen
• NA — Not Applicable
• NTFS — New Technology File System
• SIL — Speech Interference Level
• CAM — computer aided manufacturing
• TB — Terabyte
• RT — Remote Terminal
• CGI — Computer-Generated Imagery
• PSTN — Public Switched Telephone Network
• AFP — AppleTalk Filing Protocol
• ECT — Explicit Call Transfer
• MP — Multilink Protocol
• SCP — Service Control Point

• E-LEAD — Ear Lead
• PRF — Pulse Repetition Frequency
• NESDIS — National Environmental Satellite, Data, and Information Service
• DOD — United States Department of Defense
• RACF — Resource Access Control Facility
• ZIP — Zone Information Protocol
• DS — Digital Signal
• MSU — Microwave Sounding Unit
• APC — American Power Conversion
• DA — Destination Address
• MIS — Management Information System (OSHA)
• FAQ — Frequently Asked Questions (sometimes Pronounced Fak)
• FCA — Free Carrier
• NLMS — Normalized Least Mean Square
• CA — Certificate Authority
• AMI — Advanced Metering Infrastructure
• EEC — European Economic Community (predecessor of the European Union|EU)
• PWD — Password
• WPS — Wireless Priority Service
• FR — Frame Relay
• PMA — Physical Medium Attachment
• PT — Project Team
• COO — Chief Operation Officer
• BER — Bit-Error Rate
• BST — British Summer Time
• CIA — Central Intelligence Agency
• AFSK — Audio Frequency Shift Keying
• DSS — Decision Support System
• CU — See You
• MSR — Microwave Scanning Radiometer
• QA — Center for Quality Assurance in International Education
• OCR — Optical Character Recognition
• STP — Spanning Tree Protocol
• DOJ — Department of Justice (US)
• NIC — Network Information Center
• MD — Mediation Device
• IN — Intelligent Network
• ISI — Inter-Symbol Interference
• 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.
• CAN — Campus Area Network
• ACR — Attenuation Crosstalk Ratio
• IS — International Standard
• ISDN — Integrated Services Digital Network
• JPL — Jet Propulsion Laboratory (California Institute of Technology) (NASA)
• TCP/IP — transmission control protocol/internet protocol
• WG — Working Group
• 3G — Third Generation mobile phone network
• MHS — Message Handling System (electronic)
• CATV — Community Antenna Television
• CAD — Computer Aided Designer

• TN — Telephone Number
• CAB — Conformity Assessment Body
• I.LINK — IEEE 1394, High Performance Serial Bus, implementation
• RCV — Receive
• DCP — Design Change Package
• EPR — Electron Paramagnetic Resonance
• PDU — Protocol data unit (such as segment, packet, frame, etc.)
• MTTR — Mean Time To Repair
• P — Predicted
• OMS — Optical Multiplex Section
• COQ — Cost Of Quality
• AXE 10 — Series of electronic telephone exchanges from L.M. Ericsson
• ES — Errored Second
• UL — Uplink
• LF — Line Feed
• NIS — Network Information Service
• RFI — Request For Information. Sales department shorthand. Special priority when use in conjunction with RFN (see below).
• WB — Write Back
• FE — Far End
• ADEOS — ADvanced Earth Observing Satellite (Japan)
• AFS — Andrew File System
• CT — Computer Telephony
• MCU — Multipoint Control Unit
• TOP — Technical Office Protocol
• PCI — Peripheral Component Interconnect
• STK — Satellite Tool Kit
• BT — BlueTooth
• VPN — Virtual Private Network (ATM)
• ENIAC — Electronic Numerical Integrator And Computer
• EDVAC — Electronic Discrete Variable Automatic Computer
• VLL — Virtual Leased Line
• M — Management
• TG — Task Group
• TE — Traffic Engineering
• STM — Short Term Memory
• GB — Gigabyte
• RAID — Redundant Array of Inexpensive Disks
• DAP — Directory Access Protocol
• RA — Risk Analysis
• MDA — Model Driven Architecture
• SCTP — Stream Control Transmission Protocol
• RPM — Revolutions Per Minute, (Rotations Per Minute)
• AAAS — American Association for the Advancement of Science
• ISA — Industry Standard Architecture
• LZ — Landing Zone
• AMLCD — Active Matrix Liquid Crystal Display
• VAC — Vacant
• DOS — Disk Operating System
• IIS — Internet Information Services
• BR — Branch

• MLS — Multiple Listing Service
• RH — Relative Humidity
• SVD — Singular Value Decomposition
• FCP — Fibre Channel Protocol
• SPC — Stored Program Control
• TRM — Technical Reference Model
• MVS — Multiple Virtual Storage
• SPADATS — Space Detection And Tracking System
• RM — Regional Manager
• DUP — Duplicate
• BIP — Band Interleaved by Pixel
• LP — Low Pressure
• SQL — Structured Query Language
• CAA — Civil Aviation Authority
• SVC — Switched Virtual Connection
• GDS — Global Distribution System
• W3C — World Wide Web Consortium
• SBC — Session Border Controller
• USD — United States Dollar
• AEW — Airborne Early Warning
• TWT — Traveling Wave Tube
• AMD — Advanced Micro Devices, Inc. (producer of computer chips)
• AIS — Alarm Indication Signal
• LD — Long Distance
• OAS — Organization of American States
• BYOD — Bring Your Own Device
• DMA — direct memory access (computer term)
• PPB — parts per billion (109)
• NMS — Network Management System
• PAN — Personal Area Network
• BIS — Bureau of Indian Standards
• MOL — Manned Orbiting Laboratory
• AADC — Automated Area Distribution Center
• AQL — Acceptable Quality Level
• LPC — Linear Predictive Coding
• FITS — Flexible Image Transport System
• CDMA — Code Division Multiple Access (voice/data transmission)
• EAC — Engineering Accreditation Commission
• SAN — System Area Network
• NCS — National Communications System
• SOW — Statement Of Work
• ECO — Engineering Change Order
• CF — Compact Flash
• MRC — Monthly Recurring Charge
• RFO — Reason For Outage
• VOL — Volume
• IEC — International Electrotechnical Commission
• T-CARRIER — Trunk Carrier
• ARA — Apple Remote Access
• SNMP — Simple Network Management Protocol (ATM)

• CTS — Clear To Send
• DASD — Direct Access Storage Device
• DVP — Digital Voice Privacy
• Y — Yttrium
• PGA — Programmable Gate Array
• AM — Activity Manager
• BS — Beam Splitter
• ASR — Automatic Speech Recognition
• BPR — Business Process Re-engineering
• ARC — Army Reuse Center
• OPC — Originating Point Code
• DAL — Dedicated Access Line
• AEC — Architecture, Engineering, Construction
• EPABX — Electronic Private Automatic Branch Exchange
• ITSEC — Information Technology Security Evaluation Criteria
• POP — Point Of Presence (Internet)
• DID — Digital Information Display
• SNR — Signal-to-Noise Ratio
• CG — Coast Guard
• PDS — Protected Distribution System
• SCN — Switched Circuit Network
• CAV — Constant Angular Velocity
• PUB — Publication (file name extension)
• STP — Signal Transfer Point
• PC — Personal computer (host)
• FUP — Fair Use Policy
• ASQC — American Society for Quality Control's
• DBS — Direct Broadcast Satellite
• BG — Background
• ERP — Enterprise Resource Planning
• ESS — Electronic Switching System
• SOHO — Small Office Home Office
• DCS — Digital Cross-connect System
• METRO — Metropolitan
• CNM — Customer Network Management
• OS — Operating System
• OC — Optical Carrier
• PSD — Phase-Sensitive Detector
• SBC — Southwestern Bell Corporation
• LPE — Liquid Phase Epitaxy
• LEN — Line Equipment Number
• ELINT — Electronic Intelligence Satellite
• O&M — Operation and Maintenance
• FIPS — Federal Information Processing Standard
• ADC — Analog-Digital Converter
• Y — Yes
• 1000BASE-T — 1000 Megabits per Second, Baseband, Twisted Pair
• DDE — Dynamic Data Exchange (in software parlance)
• ATA — Analog Telephone Adapter
• MOD — Modify

• SHF — Super High Frequency
• DDS — Digital Data Service
• PD — Public Domain
• TLC — The Learning Channel
• ECAC — European Civil Aviation Conference
• M-CSI — Mobility management CAMEL (Customized Applications for Mobile network Enhanced Logic) Subscription Information
• BOC — Bell Operating Company
• DAHDI — Digium/Asterisk Hardware Device Interface
• CSAT — Customer Satisfaction
• AAS — Adaptive Antenna System
• IS — Information System
• AIN — Advanced Intelligent Network
• DX — Duplex
• DC — Display Controller
• ROI — Return on Investment
• SAIC — Science Applications International Corporation
• MCSD — Microsoft Certified Solution Developer
• SL — Single Line
• WYSIWYG — What You See Is What You Get (pronounced Wizzy-wig. See Entry For Derived Acronyms)
• KISS — Keep It Simple Stupid
• ATN — Aeronautical Telecommunication Network
• PIN — Personal Identification Number
• TNX — Thanks
• FDL — Facility Data Link
• RSRQ — Reference Signal Received Quality
• DCOM — Distributed Component Object Model
• CB — Common Battery
• AT&T — American Telephone & Telegraph
• BSOD — Blue Screen Of Death
• AOI — Area Of Interest
• VT — Vacuum Tube
• EIP — Equipment installation procedure
• ECP — Encryption Control Protocol
• CS — Convergence Sublayer (ATM)
• DC — Disconnected
• CIS — CompuServe Information Service
• FCS — Frame check sequence (Ethernet)
• LED — law enforcement desk; light emitting diode
• BNSC — British National Space Centre
• VC — Virtual Channel
• IRS — U.S. Internal Revenue Service
• ADN — Advanced Digital Network
• BGP — Border Gateway Protocol (routing protocol)
• BERT — Bit Error Rate Tester (telecommunication)
• PERT — Program Evaluation and Review Technique
• NNM — Network Node Manager
• OLAP — Online Analytical Processing
• DSL — Digital Subscriber Line
• CBP — Coded Block Pattern
• TSR — Telecommunications Service Request

• CATV — Cable Television
• DEC — Decimal
• RT — Response Time
• PS — Product Specification
• DSTE — Digital Subscriber Terminal Equipment
• ROFL — Rolling on the floor laughing
• DLL — Dynamic Link Library (computer file)
• EX — Exercise
• MCA — Micro Channel Architecture
• CRM — Customer Relationship Management
• EFS — Encrypting File System
• CU — Channel Unit
• ETS — European Telecommunication Standard
• EOT — End Of Transmission
• AS — Access System
• ARG — Argument
• MAC — Media Access Control
• TI — Time Interval
• NLM — National Library of Medicine (National Institutes of Health)
• SF — Single Frequency
• PRI — Primary Rate Interface (ISDN)
• VLF — Very Low Frequency
• ASIC — application-specific integration circuit
• YL — Young Lady
• AMHS — Automated Message Handling System
• LEP — Large Electron Positron
• VAZO — Violating All-Zero Octet
• A — Anode
• MCD — Magnetic Circular Dichroism
• NIST — National Institute of Standards and Technology
• ITU — International Telecommunication Union
• SXS — Step-By-Step
• APM — Advanced Power Management
• DCN — Disconnect
• RT — Radiotelephone
• BS — Broadcast Satellite
• FAA — Federal Aviation Agency
• AAF — Advanced Authoring Format
• DUC — Digital Up-Converter
• NOAA — National Oceanic and Atmospheric Administration (US)
• CER — Cell Error Ratio
• T-IC — T-interConnect
• CDT — Central Daylight Time
• TE — Test Equipment
• AUD — Audit
• GSA — U.S. General Services Administration
• NTIA — National Telecommunications and Information Administration
• FE — Finite Element
• PE — Probable Error
• PDS — Planetary Data System

• CTD — Cumulative Trauma Disorder
• PTA — Pakistan Telecommunication Authority
• ROSAT — Roentgen Satellite
• NMR — Nuclear Magnetic Resonance
• CAM — Content Addressable Memory
• ACT — Activity
• RFD — Request For Discussion
• CMM — Capability Maturity Model
• E — Echo
• EEG — Electro-EncephaloGram
• SLP — Service Location Protocol
• PPP — Point-to-Point Protocol
• SSL — Secure Socket Layer
• CCTA — Central Computer and Telecommunications Agency
• RJ-25 — Registered Jack type 25 (6-wire connector)
• JIT — Just in time
• BTC — Botswana Telecommunications Corporation
• DL — Digital Library
• TCSEC — Trusted Computer System Evaluation Criteria
• UP — User Profile
• HZ — cycles per second (hertz)
• SAS — Special Access Surcharge
• EMR — Electromagnetic Radiation
• CRC — Contrôle de Redondance Cyclique (French: Cyclic Redundancy Check)
• MTSO — Mobile Telephone Switching Office
• DSN — Deep Space Network - network of large antennas and communication facilities.
• ADCCP — Advanced Data Communications Control Procedures
• SAR — Specific Absorption Rate
• HTTPS — HyperText Transfer Protocol Secure
• TO — Technical Order
• ELF — Extremely Low Frequency
• IT — Integration Test
• GOS — Grade Of Service
• CDC — Connected Device Configuration
• SML — Service Management Layer
• CMT — Cadmium Mercury Telluride
• BPS — bits per second
• LU — Logical Unit
• JVM — Java Virtual Machine
• DCS — Digital Cross-Connect
• ECPA — Electronic Communications Privacy Act 1986
• SABGW — System Architecture Evolution Gateway
• OTS — Optical Transmission Section
• CO — Central Office
• 10BASE-T — 10 Megabits per second, Baseband, Twisted pair
• Q — Quadrature
• ADL — Advanced Distributed Learning
• AT&T — American Telephone and Telegraph (U.S. company, also known as "Ma Bell")
• DCS — Digital Cellular System
• NRC — National Research Council (Canada)

• RTN — Regional Telecommunication Network
• KBYTE — Kilobyte (103)
• TE — Terminal Equipment
• RARP — Reverse Address Resolution Protocol
• 9 — Nine
• VC-ATOD — Virtual Clearinghouse on Alcohol, Tobacco and Other Drugs
• SD — Software Development
• OSTP — Office of Science and Technology Policy
• FCA — Free Carrier Absorption
• EMC — Electromagnetic Compatibility
• SIC — Standard Industrial Classification (Code)
• ASARS — Advanced Synthetic Aperture Radar System
• DIBL — Drain-induced Barrier Lowering
• BSS — Basic Service Set
• MIPS — Millions of Instructions Per Second
• LLU — Local Loop Unbundling
• VOA — Voice Of America
• OAM&P — Operations, Administration, Maintenance & Provisioning
• ESTEC — European Space Research and Technology Centre
• BPDU — Bridge Protocol Data Unit
• NA — Network Adapter
• TSB — Telecommunication Standardization Bureau
• TCM — Trellis-Coded Modulation
• DID — direct inward dial
• ASI — Asynchronous Serial Interface
• PIC — Peripheral Interface Controller
• FR PVC — Frame Relay Permanent Virtual Connection
• ACE — Adaptive Communication Environment
• SOAP — Simple Object Access Protocol
• WWAN — Wireless Wide Area Network
• DCN — Design Change Notification
• LT — Less Than
• NIC — Network Interface Controller
• EMEA — Europe, Middle East and Africa
• EDD — Envelope Delay Distortion
• DTMF — Dual-Tone MultiFrequency
• ASP — Application Service Provider
• IV — Initialization Vector
• PDC — Personal Digital Cellular
• NNTP — Network News Transfer Protocol
• SLF — Super Low Frequency
• RSVD — Reserved
• PG — Page
• LDAP — Lightweight Directory Access Protocol (pronounced Ell-dap)
• QPSK — aeronautical quadrature phase shift keying
• SZ — Seizure
• TMS — Time Management System
• EFIS — Electronic Flight Information System
• PMP — Project Management Professional
• EECM — End-to-End Call Manager

• BS — Backing Store
• ATC — Advanced Technology Center
• SAE — Society of Automotive Engineers
• SPM — Scanning Probe Microscope
• BBM — Blackberry Messenger
• SMR — Specialized Mobile Radio
• WLTF — Wireless LAN (Local Area Network) Task Force
• AFM — Atomic Force Microscopy
• SRM — Scalable Reliable Multicast
• BSS — Base Station Subsystem
• SML/SMS — Service Management Layer/Service Management Service
• C — Cost
• PKI — Public Key Infrastructure (cryptography)
• FASB — Financial Accounting Standards Board
• PBX — Private Branch eXchange (company phone system)
• PVD — Physical Vapor Deposition
• MDF — Main Distribution Frame
• SB — Switchboard
• DNIS — Dialed Number Identification Service
• FCC — Federal Communications Commission (US)
• ITP — Interactive Telecommunications Program
• EDP — Electronic Data Processing Plc (London Stock Exchange [LSE])
• CFA — Carrier Facility Assignment
• FTTH — Fiber To The Home
• VT — Virtual Terminal
• ACF — Access Control Field
• SA — Source Address
• EM — Electromigration
• JAN — Joint Army-Navy
• CB — Citizens' Band
• PC — Peripheral Controller
• DSP — Digital Signal Processor
• FRS — Family Radio Service
• SIL — Silence
• PM — post meridian
• FTTB — Fiber To The Building
• TCO — Total Cost of Ownership
• ACLR — Adjacent Channel Leakage Ratio
• MV — Motion Vector
• TCR — Temperature Coefficient of Resistance
• SATAN — Security Administrator Tool for Analyzing Networks
• ABN — Abnormal
• PABX — private automatic branch exchange (telephone)
• DDL — Digital Data Link
• CGSA — Cellular Geographic Service Area
• DID — data item description
• CCSD — command communications service designator; control communications service designator
• DPL — Digital Power Line
• DTI — Department of Trade and Industry (UK)
• SIM — Subscriber Identity Module

• B3G — Beyond Third Generation
• SRS — Software Requirements Specifications
• NPA — Numbering Plan Area
• ARIN — American Registry for Internet Numbers
• TLK — Talk
• MME — Mobility Management Entity
• KHZ — kilohertz (1000 cycles per second)
• SOGA — Share of Gross Adds
• CST — Central Standard Time (UTC-6 Hours)
• WTLS — Wireless Transport Layer Security
• VG — Voice Grade
• SLV — Satellite-Launch Vehicle
• TAD — Telephone Answering Device
• NTIS — National Technical Information Service Technology Administration
• BOD — Bandwidth on Demand
• MX — Mixer
• MAI — Multiple Access Interference
• C4 — Command, Control, Communications, and Computers
• RTU — Remote Terminal Unit
• RP — Reference Point
• FRS — Frame Relay Service
• BRI — Basic Rate Interface
• CMS — Content Management System
• UTC — Coordinated Universal Time
• PCM — Pulse-Code Modulation
• COM — Comedy Central
• MIB — Management Information Base (ATM)
• EEA — European Economic Area
• HVAC — Heating, Ventilation, and Air Conditioning
• CFO — Communication Filing Officer
• CDA — Command and Data Acquisition
• MTU — Maximum Transmission Unit
• ECMA — European Computer Manufacturer's Association
• CAPS — Call Attempts Per Second
• RDF — Radio Direction Finder
• BAN — Base Area Network
• CQA — Certified Quality Auditor
• TOS — Temporarily Out of Service
• VOIP — Voice Over IP (Internet Protocol)
• CLI — Command line Interface (Cabletron)
• SCADA — Supervisory Control And Data Aquisition
• ISM — Industrial, Scientific and Medical
• WLAN — Wireless Local Area Network
• OSCAR — Orbiting Satellite Carrying Amateur Radio
• S/D — Source/Drain
• O/S — Operating System
• E&M — ear and mouth (special signaling leads)
• NBS — National Bureau of Standards (US)
• 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

• ARINC — Aeronautical Radio Incorporated
• DL — Data Link
• PDT — Portable Data Terminal
• CTU — Central Terminal Unit
• PVC — Permanent Virtual Circuit (ATM)
• ASDE — Airport Surface Detection Equipment
• CGA — Carrier Group Alarm
• ISAS — Institute of Space and Astronautical Sciences (Japan)
• SLIC — Subscriber Line Interface Circuit
• AYT — Are You There
• ADT — Atlantic Daylight Time (UTC-3 Hours)
• NEMA — National Electric Manufacturer's Association
• DRM — Digital Rights Management
• LQR — Linear Quadratic Regulator
• CS-PDU — Convergence Sublayer - Protocol Data Unit
• WE — Western Electric
• SQ — Service Quality
• STD — Subscriber Trunk Dialing
• FEP — Front End Processor
• YYP — Yahoo Yellow Pages
• BIU — Bus Interface Unit
• SN — Service Number
• OC-9 — Optical Carrier Signal, Level 9
• FSK — Frequency-Shift Keying
• BCH — Binary Coded Hexadecimal
• ERP — Enterprise Resource Management
• ARQ — Automatic Repeat-reQuest
• COPS — Common Open Policy Service
• TAM — Telephone Answering Machine
• SPX — Sequenced Packet Exchange
• IANA — Internet Assigned Numbers Authority
• CBWFQ — Class Based Weighted Fair Queueing
• EAI — Enterprise Application Integration
• TTY — Teletype Telex Machine
• WAFB — Wireless Absolute Fairness Bound
• MIT — Massachusetts Institute of Technology (U.S.)
• WDN — Wireless Developer Network
• CT — Computer Terminal
• STA — State
• RSN — Real Soon Now [which may be a long time coming]
• FAS — Frame Alignment Signal
• E — Electra
• OLE — Object Linking and Embedding (Microsoft communication protocol)
• AP — Action Point
• MIDP — Mobile Information Device Profile
• MLP — Mobile Location Protocol
• ES — Emergency Service
• NES — Network Encryption System
• SBU — Strategic Business Units
• AC — Area Code

• CMP — Connection Management Protocol
• CAP — Capability
• ESF — Edge Spread Function
• DMI — Distributed Management Interface
• LD — Laser Diode
• VGA — Video Graphics Array
• B2C — Business-to-Consumer
• FLM — First Line Maintenance
• NTP — Network Time Protocol
• MMU — Memory Management Unit
• SG — Signaling Gateway (IETF)
• SD — Speed Dial
• MDM — Mobile Device Management
• AVL — Available
• TOA — Time Of Arrival
• EPR — Ethylene-Propylene Rubber
• ISBN — International Standard Book Number (ISO 2108)
• TSE — Toronto Stock Exchange
• CRO — Central Records Office
• BA — Behaviour Aggregate
• ETF — Early Termination Fee
• CPC — Continous Packet Compression
• CS — Central Station
• IRLAN — Infrared LAN
• SVP — Senior Vice President
• ER — Extended Range
• CP — Call Processing
• FXS — Foreign Exchange Subscriber
• 2W — 2-Wire
• TDOA — Time Difference Of Arrival
• POTS — Plain Old Telephone Service (FCW)
• CSC — Common Signaling Channel
• BIS — Business Information System
• OC-18 — Optical Carrier Signal, Level 18
• SSRC — Synchronization Source
• SDLC — Synchronous Data Link Control
• MH — Message Handler
• DAP — Distributed Array Processor
• SW — South West
• ACP — Access Control Point
• PU — Physical Unit (IBM)
• AIT — Automatic Identification Technology
• NOC — Network Operations Center
• SHA — Secure Hash Algorithm
• DII — Dynamic Invocation Interface
• CI — Common Interface
• PAP — Password Authentication Protocol (ATM)
• CGA — Color Graphics Adapter
• HEHO — Head End Hop Off
• BUS — Business

• KAK — Key-Auto-Key
• APS — Automatic Protection Switching (SONET/SDH)
• CFD — Call For Discussion
• TDM — Time Division Multiplexer
• DM — Domain Model
• AWT — Agence Wallonne des Télécommunications
• CIP — Carrier Identification Parameter
• TELECOMMUTE — Telecommuting
• AIFF — Audio Interchange File Format
• PSS — Performance Support System
• PM — Project Manager
• RDS — Rate Determining Step
• 100BASE-T4 — 100 Megabits per Second, Baseband, Four-pair Category 3 UTP cables
• NCSC — National Computer Security Center (NSA)
• GMRS — General Mobile Radio Service
• CPN — Cisco Powered Network
• CIS — Computer and Information Science
• ODBC — Open Database Connectivity
• SIT — Static Induction Transistor
• IRS — Inertial Reference System
• SCU — System Control Unit
• BJT — Bipolar Junction Transistor
• SDK — Software Development Kit (Microsoft)
• TUR — Trunk Utilization Report
• DSLAM — Digital Subscriber Line Access Multiplexer (Module)
• CORBA — Common Object Request Broker Architecture
• C³CM — Command, Control and Communications Countermeasures
• SDU — Signal Distribution Unit
• V — Variable
• AIF — Audio Interchange Format
• EIGRP — Enhanced Interior Gateway Routing Protocol
• CMD — Command
• UI — User Interface
• C — Collector
• TOVS — TIROS Operational Vertical Sounder
• ESP — Encapsulating Security Payload
• FEP — Front-End Processor
• CIFS — Common Internet File System
• NIST — National Institute of Standards & Technology (US)
• SSM — Synchronization Status Message
• JPEG — Joint Photographic Experts Group (24-bit image storage format)
• DTN — Data Transfer Network
• SM — Service Module
• SPA — Software Publishers Association
• UN — United Narions
• ACTV — Active
• IMP — Interface Message Processor
• CG — Center of Gravity (DXS)
• CE — Channel Element
• ADT — American District Telegraph Company

• RTC — Real-Time Control
• ISSN — International Standard Serial Number (ISO 3297)
• RSS — Really Simple Syndication
• FDTD — Finite Difference Time Domain
• SPIN — Service Provider Identification Number
• WIPO — World Intellectual Property Organization
• DS-0 — Digital Signal, Level 0
• DC — Device Control
• SPGA — Staggered Pin Grid Array
• BSS — Base Station System
• CHF — Swiss Franc
• AWG — American Wire Gauge
• WPAN — Wireless Personal Area Network
• SIA — Securities Industry Association
• RSVP — Resource Reservation Protocol (Internet)
• RMS — root mean square (preferred over "RMS")
• XPS — X-Ray Photoelectron Spectroscopy
• EHF — Extremely High Frequency
• PM — Phase Modulation
• TAX — Trunk Automatic Exchange
• P — Priority
• ASD — Alternative Service Delivery
• B2B — Business to Businesse
• CVR — Crystal Video Receiver
• IRC — International Record Carrier
• ECM — Electronic Counter Measures
• IAT — Integrated Access Terminal
• APPL — Application
• TTY — Text Teletype
• EGP — Exterior Gateway Protocol
• BMS — Business Management System
• AN — Access Node
• EU — End User
• OTDOA — Observed Time Difference of Arrival
• FEC — Forward Error Correction
• WPM — speech--words per minute
• CFD — computational fluid dynamics
• DNIC — Data Network Identification Code
• FAX — Facsimile
• FOSE — Federal Office Systems Exposition
• IPS — InPlane Switching
• WAYP — White and Yellow Pages
• ADN — Abbreviated Dialing Number
• FAT — File Allocation Table
• WHT — Walsh-Hadamard Transform
• EMCON — Electromagnetic Emission Control
• ACAP — Application Configuration Access Protocol
• CP — Change Proposal
• D-RAM — Dynamic Random Access Memory
• DCE — Data Communication Equipment

• OC-256 — Optical Carrier Signal, Level 256
• LASA — Large Aperture Seismic Array
• SDH — Synchronous Digital Hierarchy (ATM)
• PIM — Personal Information Manager
• IEC — Interexchange Carrier
• CAD — Computer-Aided Design
• T — Temperature
• PDN — Packet Data Network
• BOSS — Binary Object Storage System
• ADC — Administration Center
• BOFH — Bastard Operator From Hell
• DPL — Digital Private-Line
• 911 — Emergency Services Phone Number
• PPARC — Particle Physics and Astronomy Research Council
• 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)
• RAN — Radio Access Network
• CD — Critical Dimension
• SN — Stock Number
• PVC — Permanent Virtual Connection
• DHD — Dial Home Device
• ISAKMP — Internet Security Association and Key Management Protocol
• PST — Pacific Standard Time (UTC-8 Hours)
• RMI — Remote Method Invocation
• HDSL — High-bit-rate Digital Subscriber Line
• 100BASE-T — 100 Megabits per second, Baseband, Twisted pair
• TRS — Telecommunications Relay Service
• MPI — Minimum Picture Interval
• SSM — Spread Spectrum Modulation
• WAR — Weekly Activity Report
• IOC — Inter-Office Channel
• VSAT — Very Small Aperture Terminal (satellite service)
• ELT — Emergency Locator Transmitter
• BMEWS — Ballistic Missile Early Warning System (bee-mews)
• EC — European Community
• CCD — Charge Coupled Device - a device for the movement of electrical charge.
• HFC — Hybrid Fiber/Coaxial network
• IPM — Inches Per Minute
• ST — Such That
• AP — access point
• ASA — Acoustical Society of America
• DDU — Disk Drive Unit
• VOC — Volatile Organic Compounds (air pollution)
• DTD — Document Type Definition (XML)
• AOL — America on line
• QDR — Quad Data Rate
• CONUS — Contiguous United States
• MTS — Message Transfer System
• MPEG — Motion Picture Experts Group
• CGM — Computer Graphics Metafile
• EDC — Electronic Dispersion Compensator

• KB — Kilobyte: One thousand and twenty-four bytes kbps kilo bit per second
• AFOSR — Air Force Office Of Scientific Research(USA)
• OSP — Outside Plant
• ANI — Automatic Number Identification (Caller ID)
• MIME — Multipurpose Internet Mail Extension
• ALT — Accelerated Life Test
• IRS — Interface Requirements Specification
• DGPT — Directorate General of Posts and Telecommunications
• PP — Polypropylene
• USGS — United States Geological Survey (DOI)
• DDD — Direct Distance Dialing
• EISA — Extended Industry Standard Architecture
• MA — Maintenance Action
• COMDEX — Computer Dealers Exposition
• EMS — Express Mail Service
• CAM — Common Access Method
• COT — Central Office Terminal
• AVR — Automated Voice Response
• REPT — Report
• T&C — Terms & Conditions
• PMT — Program Management Team
• SIL — Solid Immersion Lens
• COO — Cell of Origin
• 1FB — Single line, Flat Business rate;
• PROM — Programmable Read-Only Memory
• SAR — synthetic aperture radar (satellite)
• ORB — Object Request Broker
• GDM — GSM (Global System for Mobile communications) Data Module
• VMS — Virtual Memory System
• SWAP — Shared Wireless Access Protocol
• TSO — Telecommunications Service Order
• SCM — Supply Chain Management
• ET — Electronic Transmission
• ROTFL — Roll On The Floor Laughing
• MBPS — Megabits per second
• CSPDN — Circuit Switched Public Data Network
• 2W — Two Wire
• CND — Calling Number Display
• IMC — Intermediate Metal Conduit
• VF — Voice Frequency
• HSS — Home Subscriber Server
• ILEC — Incumbent Local Exchange Carrier
• ACPI — Advanced Configuration and Power Interface
• FWA — Fixed Wireless Access
• FITL — Fiber-In-The-Loop
• CFV — Call For Vote(s)
• WAIS — Wide Area Information Server
• OFC — Office
• PCI — Personal Computer Interface
• TL1 — Transaction Language 1

• BSA — Business Software Alliance
• NF — Noise Factor
• LNP — Local Number Portability
• DCA — Dynamic Channel Assignment
• LS — Loop Start
• MA — Message Analysis
• DVB — Digital Video Broadcasting
• EDT — Eastern Daylight Time
• SAF — System Access Fee
• MC — Maintenance Control
• GI — Graded-Index
• CRTS — Cellular Radio Telecommunications Service
• DNS — Domain Name Service
• JTF — Joint Task Force
• FH — Frequency Hopping
• LATA — Local Access and Transport Area
• AWACS — Airborne Warning And Control System
• TDMA — Time Division Multiple Access
• HTML — Hyper Text Markup Language
• JCL — Job Control Language
• UPS — Uninterruptible Power Supply
• CMRS — Commercial Mobile Radio Service
• TCIC — Trunk Circuit Identification Code
• DAT — Digital Audio Tape
• DMS — Data Management System
• 3-D — 3-Dimensional
• NRPB — National Radiological Protection Board
• EFT — Electronic Funds Transfer
• GHZ — Gigahertz
• DTAP — Direct Transfer Application Process
• TKIP — Temporal Key Integrity Protocol
• IEEE — Institute of Electrical and Electronics Engineers
• DL — Definition List
• INSAT — Indian National Satellite
• LANE — Local Area Network Emulation
• ADB — Apple Desktop Bus
• AOS — Alternate Operator Service
• MP — Modulation Parameter
• RXQUAL — Received Signal Quality
• CDE — Common Desktop Environment
• TAG — Technical Advisory Group for Biological Control Agents of Weeds
• FGA — Feature Group A
• LISP — List Processing Language
• DTI — Digital Trunk Interface
• FOD — Fax on Demand
• KDC — Kerberos Key Distribution Center
• ACC — Area Control Center
• FTTC — Fiber To The Curb光纤到路边
• DM — Differential Mode
• UDP — Up Down Pair

• MSW — Most Significant Word
• ALOC — Average Length Of Call
• EIA — Extended Interaction Amplifier
• DER — Distinguished Encoding Rules
• DSI — Digital Speech Interpolation
• ICL — Inserted Connection Loss
• EMR — Electromechanical Relay
• 3GPP — Third Generation Partnership Project
• DDI — Direct Dialing Incoming
• NSS — Network Switching Subsystem
• ALB — Analog Loopback
• LIF — Logical Interchange Format
• FEXT — Far-End Cross Talk
• RNX — Restricted Numeric eXchange
• FGD — Feature Group D
• AAV — Accountholder Authentication Value
• ISOC — Internet Society
• DSN — Defense Switched Network
• SRR — Search and Rescue Region
• 3G — 3rd Generation Wireless Format
• RCC — Radio Common Carrier
• RAU — Remote Access Unit
• CRV — Call Reference Value
• DUA — Directory User Agent
• ACA — Adaptive Channel Allocation
• CPS — characters per second
• MGMT — Management
• SCPC — single channel per carrier
• CMA — Communications Management Association
• WAP — Wireless Application Protocol
• JRE — Java Runtime Environment
• OML — Object Model Library
• CMIP — Common Management Information Protocol (ATM)
• DDN — U.S. Defense Data Network
• ILD — International Long Distance
• GBT — Ground Based Tower
• DSS — Digital Signature Standard
• CIC — Carrier Identification Code
• DPSK — Differential Phase Shift Keying
• LDN — Local Directory Number
• CIP — Channel Interface Processor
• IG — Interface Group
• CAL — Calorie
• IP — Intellectual Property
• DII — Defense Information Infrastructure
• QI — Quality Indicator
• SDM — Service Delivery Management
• CES — Consumer Electronics Show
• VPA — Valid Peripheral Address
• OSHA — Occupational Safety and Health Act (1970)

• DEMUX — Demultiplexer
• COAX — Coaxial
• OSS — Operations Support System
• NAFTA — North American Free Trade Agreement
• CBR — Constant Bit Rate
• BLOS — Beyond Line-Of-Sight
• BAN — Building Area Network
• VTS — Vessel Traffic Service
• SUS — Suspension
• CSO — Customer Service Operations
• CCCH — Common Control Channel
• TT — Text-Telephone
• ADC — Access Deficit Charge
• CNG — Fax Calling Tone
• ICANN — Internet Corporation for Assigned Names and Numbers
• CCP — Compression Control Protocol
• APDU — Application Protocol Data Units
• IPS — Instructions Per Second
• TCB — Telecommunication Certification Body
• 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
• KM — Knowledge Management
• CPC — Calling Party Control
• CRIS — Carrier Route Information System
• FAC — Forced Authorization Code
• VPI — Virtual Path Identifier
• L2TPV3 — Layer 2 Tunneling Protocol Version 3
• DCS — Data Collection System (NOAA Polar Orbiting Satellites)
• EOB — End Of Business
• MLM — Multi-Longitudinal Mode
• LMS — Learning management system
• SDP — Software Development Plan
• ECP — Engineering Change Proposals
• DLP — Data Link Processor
• DN — Distinguished Name
• B6ZS — Bipolar 6 Zero Substitution
• PAM — Payload Assist Module
• DVMRP — Distance Vector Multicast Routing Protocol
• SPD — Serial Presence Detect
• GAN — Global Area Network
• COC — Central Office Connection
• WFA — Wait for Answer
• NIU — Network Interface Unit
• SN — Switching Network
• TDD — Time Division Duplex
• COMINT — Communications Intelligence
• MR — Mobile Router
• OTA — Office of Technology Assessment (U.S.; abolished by Congress, Fall 1995)
• SIM — Subscriber Identification Module
• B-ISDN — Broadband Integrated Services Digital Network
• ISG — Information Systems Group

• BLER — Block Error Rate
• CDM — Conceptual Data Model
• FCA — Fixed Channel Allocation
• RDT — Recall Dial Tone
• PACS — Personal Access Communications System
• FDI — Feeder Distribution Interface
• VN — Virtual Network
• USA — Underground Service Alert
• AMSS — Automatic Message Switching System
• MBWA — Mobile Broadband Wireless Access
• JDK — Java Development Kit
• BIS — Brought Into Service
• BT — Burst Tolerance
• EVA — Electronic Video Agent
• SISIR — Singapore Institute of Standards and Industrial Research
• RSL — Restricted Service License
• LOO — Likelihood of Occurrence
• 2G — Second Generation Wireless Systems
• WMO — World Meteorological Organization (ICSU)
• TC — Transmission Convergence (ATM)
• FC — Frame Control
• BCH — Bose-Chaudhuri-Hocquenghem Coding
• CLK — Clock
• LSW — Least Significant Word
• OOP — Object-Oriented Programming
• NAT — Network Address Translation
• JST — Japan Standard Time
• IAB — Internet Architecture Board
• ECE — Economische Commissie voor Europa (United Nations) (Dutch: Economic Commission for Europe)
• TFTP — Trivial File Transfer Protocol (ATM)
• SSN — Switched Service Network
• VLAN — Virtual Local Area Network
• RRN — Routing Recording Number
• EEROM — Electronically Erasable Read-Only Memory
• CRLF — Carriage-Return Line-Feed
• CLDC — Connected Limited Device Configuration
• TU — Transmission Unit
• LRC — Learning Resource Center
• MCC — Mission Control Center (JSC)
• EA — Extended Address Field Bit
• PCMCIA — Personal Computer Memory Card International Association
• EBS — Electron Bombarded Silicon
• ARM — Asynchronous Response Mode
• HSPA — High Speed Packet Access
• HDML — Handheld Device Markup Language
• FI — Format Identifier
• SMS — Service Management System
• SPC — Statistical Process Control. Forerunning quality theory from the 1960s to TQC and TQM.
• NDVI — Normalized Difference Vegetation Index
• EBCDIC — Extended Binary-Coded Decimal Interchange Code

• VLSI — Very-Large-Scale Integration
• WVOIP — Wireless Voice over Internet Protocol
• WTO — World Trade Organisation
• ADF — automatic document feeder
• DPT — Dynamic Packet Transport
• EULA — End User License Agreement (usually in reference to software)
• CLETS — California Law Enforcement Telecommunication System
• CRB — Cramer-Rao Bound
• BSC — Bi-Synchronous Communications
• NC — Network Channel
• BER — Basic Encoding Rules (ASN.1)
• ASQ — Alpha System Qualification
• HEX — Hexadecimal (base 16)
• RDI — Remote Defect Indicator (UNI Fault Management)
• CV — Coding Violation
• ATS — Abstract Test Suite
• FNN — Full National Number
• AMPS — Advanced Mobile Phone System
• RADIUS — Remote Authentication Dial-In User Service
• ABM — Asynchronous Balanced Mode
• INTELSAT — International Telecommunications Satellite
• SNA — System Network Architecture
• IMSI — International Mobile Subscriber Identity
• UART — Universal Asynchronous Receiver/Transmitter
• CIRC — Cross-Interleaved Reed-Solomon Code
• ECR — Electronic Cash Register
• BSI — British Standards Institution
• NCF — Network Control Facility
• ACSE — Association Control Service Element
• TOMS — Total Ozone Mapping Spectrometer (satellite Instrument)
• OT — Office of Telecommunications
• IRDA — Infrared Data Association
• DPA — Distributed-Power Architecture
• IR — International Roaming
• LRC — Longitudinal Redundancy Check
• SOS — Save Our Souls (Help!)
• TD — Transmit Data
• DSCP — Differentiated Services Code Point
• DISN — Defense Information Systems Network
• FECN — Forward Explicit Congestion Notification (ATM)
• 4W — Four-Wire
• RMS — Resource Management System
• CID — Craft Interface Device
• PD — Pulse Duration
• VBA — Visual BASIC for Applications
• SCR — Sustainable Cell Rate
• OMF — Object Management Framework
• CRS — Cell Relay Service
• EMS — Element Management System (ATM)
• HLR — Home Location Register

• 3GPP — Third-Generation Partnership Project
• MGC — Multimedia Gateway Controller
• CSR — Customer Service Report
• TRS — Trunked Radio Systems
• CFNRY — Call Forwarding on No Reply
• AF — Assured Forwarding
• DIL — Direct Inward Line
• IMEI — International Mobile Equipment Identity
• 4GL — Fourth-Generation Language
• RICK — Repeater Interface Communications Kit
• SE — Southeast
• ADM — Administration Building
• CIAC — Computer Incident Advisory Capability
• RMON — Remote Monitoring
• AMPS — Advanced Mobile Phone Service (cellular phone standard)
• DPDU — Data Protocol Data Unit
• UMA — Unlicensed Mobile Access
• RP — Radio Port
• CALEA — Communications Assistance for Law Enforcement Act
• CSPRM — Common Signaling Protocols Resource Module
• SMDS — Switched Multimegabit Data Service (ATM)
• CCR — Customer Controlled Reconfiguration (Sprint)
• RJE — Remote Job Entry
• ROS — Return on Sales
• LEC — Local Exchange Carrier
• MF — Multiple Frequency
• DDCMP — Digital Data Communications Message Protocol
• IRQ — Interrupt Request
• DXC — Digital Cross Connect
• NAK — Negative Acknowledge
• RGN — Region
• PEM — Privacy-Enhanced Mail
• ULL — Unbundled Local Loop
• SCR — System Change Request
• RSS — Radio Service Software (Motorola)
• CACH — Call Appearance Call Handling
• ANC — Access Network Controller
• TCA — Threshold Crossing Alert
• MMM — Mobile Media Mode
• ESCON — Enterprise System Connection
• DARTS — Design Approach for Real-Time Systems
• VDR — Voice Digitization Rate
• EBIC — Electron Beam Induced Current
• WTS — Wireless Telecommunications Symposium
• INE — Intelligent Network Element
• CMOS — Complementary Metal Oxide Semiconductors
• RCU — Radio Control Unit
• LB — Local Battery
• EDFA — Erbium-Doped Fiber Amplifier
• OMP — Open Management Platform

• BCDIC — Binary Coded Decimal Interchange Code
• EIR — Equipment Identity Register
• VLSI — Very Large-Scale Integration
• AAS — advanced automation system (FAA)
• ASAR — Advanced Synthetic Aperture Radar 
• WARC — World Administrative Radio Conference
• ISI — Intersymbol Interference
• ALI — Automatic Location Information
• SITA — Société Internationale de Télécommunications Aéronautiques
• ASN.1 — Abstract Syntax Notation 1
• DCMI — Dublin Core Metadata Initiative (Online Computer Library Center)
• APN — An Access Point Name
• CBEMA — Computer & Business Equipment Manufacturers Association
• MFC — Multi-Frequency Code
• SLAM — Scanning Laser Acoustic Microscope
• DCAS — Downloadable Conditional Access System
• LCR — Least Cost Routing
• STMR — Sidetone Masking Rating (telecommunications)
• NFPA — National Fire Protection Association
• NAS — Network-Attached Storage
• RPV — Remotely Piloted Vehicle
• 2G — Second generation cellular
• SAT — Satellite
• CAC — Connection Admission Control (Asynchronous Transfer Mode)
• FMR — Follow Me Roaming
• SSP — Security Service Provider
• ASN.1 — Abstract Syntax Notation One
• NRP — Network Resource Planning
• VSAT — Very Small-Aperture Terminal
• AWG — arrayed waveguide grating
• SSMA — Spread-Spectrum Multiple Access
• MHO — My Humble Opinion
• IAD — Integrated Access Device
• DACS — Digital Access Cross-connect System
• WAE — Wireless Application Environment
• VBR — Variable Bit Rate (ATM)
• FTTK — Fibre To The Kerb
• WSDL — Web Services Description Language
• LI — Length Indicator
• ASEAN — Association of South East Asian Nations
• POP — Post Office Protocol
• ADCCP — Advanced Data Communication Control Procedures
• LIDB — Line Information DataBase
• POE — power over ethernetinjector
• VCC — Virtual Channel Connection (ATM)
• CLD — Cross-Layer Design
• AT — Attenuation
• RDBMS — Relational Data Base Management System (Oracle)
• FMC — Fixed Mobile Convergence "Mobile UC or Unified Communications over Wireless"
• VR — Virtual Router

• VCI — Virtual Channel Identifier
• CRBT — Caller Ring Back Tone
• GS — Ground Start
• ETN — Electronic Tandem Network
• RSS — root-sum-square
• CCIR — International Radio Consultative Committee (French Acronym)
• UCF — Unregistration Confirm
• WDA — Wireless Digital Assistant
• DA — deca
• TEI — Terminal Endpoint Identifier
• SMB — Server Message Block
• SWBD — Switchboard
• TSC — Test System Controller
• PDL — Positioning Data Link
• DPBX — Digital Private Branch Exchange
• EMF — Event Management Framework
• CPG — Converged Packet Gateway
• OSF — Open Software Foundation
• VHSIC — Very High-Speed Integrated Circuit
• BOM — Bit-Oriented Message
• BHCA — Busy Hour Call Attempt
• MSDP — Multicast Source Discovery Protocol
• SCM — Single-Carrier Modulation
• 4WAI — Four-Wire Analog Interface
• CHTML — Compact Hypertext Markup Language
• RAU — Radio Access Unit (Army)
• ACT — ACTIVITY, ACTIVITIES
• CTO — Commonwealth Telecommunications Organisation
• ECM — Error Correction Model
• FRAD — Frame Relay Access Device
• DPCM — differential pulse code modulation
• VPX — Virtual Path Cross-Connect
• YABA — Yet Another Bloody Acronym
• PCCA — Portable Computer Communications Association
• TP — Transition Point
• DTU — Data Transfer Unit
• CAPTAIN — Character And Pattern Telephone Access Information Network
• LCF — Location Confirm
• QS — Quasi-Synchronous
• WINS — Windows Internet Name Service
• TXM — Transmission X-ray Microscope
• YA — Yet Another
• DRQ — Disengage Request
• NII — National Information Infrastructure (USA)
• TLT — Test Loop Translator
• YAHOO — You Are Hazy Over Oranges
• DIS — Draft International Standard
• EGSM — Extended Global System for Mobile Communications
• DE — Discard Eligibility (ATM)
• RLU — Remote Line Unit

• NCSA — National Center for Supercomputing Applications
• FDD — Frequency Division Duplex
• CPAP — Customer Premises Access Profile
• ATS — Automatic Transfer Switch
• ARSR — Air Route Surveillance Radar
• VPWS — Virtual Private Wire Service
• CAVE — Cellular Authentication and Voice Encryption Algorithm
• TBCD — Telephony Binary Coded Decimal
• TCC — Transmission Control Code
• RFR — Radio Frequency Radiation
• GDK — GIMP (GNU Image Manipulation Program) Drawing Kit
• DNSIX — Defense Network Security Information Exchange
• LAG — Link Aggregation Group
• TP — Termination Point
• PLL — Phase Locked Loop
• 3G — Third Generation (mobile communication system)
• IPCP — Internet Protocol Control Protocol
• CTI — Computer Telephony Integration
• STN — Station
• CTE — Computer Telephony Engineer
• DTE — Digital Terminal Equipment
• CIP — Continuous Improvement Program
• EMI — Electro-Magnetic Interference
• RISC — Reduced Instruction Set Computing
• LH — Link Handler
• VESA — Video Electronics Standards Association
• ABBR — Abbreviation
• DRFM — Digital Radio-Frequency Memory
• OBC — Onboard Computer
• ADPC — Automatic Data Processing Center
• TP — Telephone Pole
• TEL — Telephone
• SRL — Singing Return Loss
• IDF — Independent Distribution Frame
• EFCI — Explicit Forward Congestion Indication (ATM)
• CODEC — Coder/decoder
• STP — standard temperature and pressure (0° and 1 atm)
• LCP — Local Control Point
• DCF — Distributed Coordination Function
• WSFL — Web Services Flow Language
• FMS — Fixed Mobile Substitution
• UMTS — Universal Mobile Telecommunications Service
• 4G — Fourth Generation Wireless Systems
• PNP — Plug-and-Play
• CAMA — Centralized Automatic Message Accounting
• NIMBY — Not In My Back Yard
• LT — Line Termination
• ARFA — Allied Radio Frequency Agency
• F — Frequency
• FEA — Finite Element Analysis

• NTDS — Naval Tactical Data System
• VSAM — Virtual Storage Access Method
• RDMA — Remote Direct Memory Access
• CLCC — Ceramic Leaded Chip Carrier
• CPOP — Circuit Precedence Over Packet data
• NCC — Network Control Center (GSFC)
• CSP — Converged Service Platform
• NREN — National Research and Education Network
• CTIA — Cellular Telecommunications Industry Association
• VOB — Versioned Object Base
• IPVX — Internet Protocol version X
• LRM — Long Reach Multimode
• RADIUS — Remote Authentication dial In User Service
• CT — Cordless Telecommunications
• CRBT — Color Ring Back Tone
• LDP — Label Distribution Protocol
• ADTM — Asynchronous Data Transfer Mode
• DOD — Direct Outward Dialing
• VNS — Virtual Network System
• BP — Block Parity
• ACF — Advanced Communications Function (IBM)
• CON — Concentrator
• LIM — Line Isolation Monitor
• AUI — Attachment Unit Interface
• 4WA — Four Wire Analog
• CPE — Customer Premise Equipment
• TACSAT — Tactical Satellite
• TTYL — Type To You Later
• PSN — Packet Switched Network
• DQDB — Distributed Queue Dual Bus
• CCNA — Cisco Certified Network Associated
• BASIZE — Buffer Allocation Size
• EST — Establish
• VRML — Virtual Reality Modeling Language
• ACF — Access Coordination Function
• PTT — Push to Talk Technology
• DIV — Divisionsion
• SPID — Service Profile Identifier
• DOD — Dial on Demand
• TNI — Telephone Network Interface
• C3I — Command, Control, Communications & Intelligence
• AAP — Alternate Access Provider
• DPDT — Double-Pole Double-Throw
• SMI — Structure of Management Information
• TCS — Telephony Control Specification
• FDOA — Frequency Difference Of Arrival
• CIS — Center for Integrated Systems
• ENV — Environment
• AAV — Alternate Access Vendor
• CBMS — Computer-Based Message System

• RX — Receive
• KSU — Key Service Unit
• UML — Unified Modeling Language (Object Management Group, OMG)
• ECS — Encryption Control Signal
• CDM — Configuration Data Manager
• CCA — Carrier-Controlled Approach
• RCS — Radar Cross Section
• OD — Outside Diameter
• RQMT — Requirement
• P&A — Privacy and Authentication
• FCA — Free Carrier Alongside
• ET — Exchange Terminal
• AAL5 — ATM (Asynchronous Transmission Mode) Adaptation Layer 5
• LPD — Low Probability of Detection
• DFG — difference-frequency generation
• FPS — Framing Pattern Sequence
• BSID — Base Station Identity
• WIN — Wireless Intelligent Network
• CSU — Channel Service Unit
• CC — Composite Clock (SONET)
• SONET — Synchronous Optical Network
• RCP — Right-Hand Circular Polarization
• SCC — Specialized Common Carrier
• RTC — Right to Carry
• EDSX — Electronic Digital Signal Cross-Connect
• FR — Functional Requirement
• RAD — Recorded Announcement Device
• IWF — Interworking Function
• VOB — Voice Over Broadband
• MPU — Main Processor Unit
• LXT — Local Exchange Terminal
• BAM — Basic Access Module
• IRTF — Internet Research Task Force
• ITT — Invitation To Tender
• SSAP — Source Service Access Point
• CSIRO — Commonwealth Scientific and Industrial Research Organization
• RDT — Remote Digital Terminal
• CNG — comfort noise generation
• CCNA — Cisco Certified Network Administrator
• EM — Element Manager
• WFA — Work Force Administration
• TIFF — Tag Image File Format
• DDM — Data Distribution Manager
• FOIP — Fax Over Internet Protocol
• CPH — Call Party Handling
• X — X Window System
• CICS — Customer Information Control System (IBM Mainframe Software; Kicks Or C-I-C-S)
• PBT — Polybutylene Terephthalate
• FAT — Final Acceptance Testing
• NCP — Network Control Protocol

• BDFB — Battery Distribution Feeder Bay
• DLL — Digital Local Line
• RACH — Random Access Channel
• SDNS — Secure Data Network System
• VQV — Voice Quality Value
• CSCW — Computer-Supported Cooperative Work
• NOAO — National Optical Astronomy Observatories (Tucson, AZ)
• CM — Connection Manager
• ATD — Advanced Technology Demonstration
• AFPS — Automatic Facility Protection Switching
• DISA — U.S. Defense Information Systems Agency
• TPS — Telephone Preference Service
• TED — Triteal Enterprise Desktop
• OSA — Open System Architecture
• ESCA — photoelectron spectroscopy for chemical analysis
• WORM — Write-Once, Read-Many
• TOC — Telecommunication Operations Center
• B2B — Business-to-Business
• LIS — Lightning Imaging Sensor
• DOT — Department of Telecommunications (India)
• IBSS — Independent Basic Service Set
• BELLCORE — Bell Communications Research, Inc.
• AI — Adapter Interface
• DOCSIS — Data over Cable Service Interface Specification
• B8ZS — Binary Eight Zero Substitution
• UTL — Utility
• TDD — Telecommunications Device for the Deaf
• LSI — Large Scale Integration -> VLSI
• MFLOPS — Millions of Floating Point Operations per Second
• CMC — Career Management Center
• BIND — Berkeley Internet Name Domain
• CCITT — Comit? Consultatif International T?l?graphique et T?l?phonique
• PUK — PIN (Personal Identification Number) Unlocking Key
• SDSL — Symmetric Digital Subscriber Line
• ATS — Air Traffic Services
• PJC — Pointer Justification Count
• VO — Voice Only
• ADP — Automatic Data Processor
• GLT — Great Lakes Telecom
• DAC — Digital-To-Analog Converter
• CVD — Chemical Vapor Deposition
• TCM — Time Compression Multiplexer
• DTL — Defense Telephone Link
• ELFEXT — Equal-Level Far-End Cross-Talk
• PARC — Palo Alto Research Center
• MAP — Mobile Application Part
• ANAC — An Automatic Number Announcement Circuit
• AMOLED — Active Matrix Organic Light-Emitting Diode
• IPLC — International Private Leased Circuit
• ATB — Above-Ground Telecommunications Backbone

• WTL — Wireless Transport Layer
• VCA — Voice Connecting Arrangement
• FSK — Frequency Shift Keying
• SCE — Service Creation Environment
• TCP/IP — Transmission Control/Internet Protocol
• NDS — Novell Directory Services
• COP — Character Oriented Protocol
• DDSN — Digital Derived Services Network
• TP — Transaction Processor
• TDWR — Terminal Doppler Weather Radar
• TOP — technical/office protocol
• RECON — Reconnaissance
• IMAP — Internet Mail Access Protocol
• NE — North-East
• DECCO — DISA Defense Commercial Communications Office
• CDVT — Cell Delay Variation Tolerance
• CDV — Cell Delay Variation(ATM)
• WNMS — Wireless Network Management System
• VCR — Videocassette Recorder
• SIP — Session Initiation Protocol
• SIGTRAN — Signaling Transport
• SVC — Switched Virtual Circuit (ATM)
• MCP — Microsoft Certified Professional
• WSA — Wireless Security Auditor
• DXF — Data Exchange Format
• FMS — Fraud Management System
• MITI — Ministry of International Trade and Industry
• CCCI — Command, Control, Communications and Intelligence
• COFA — Change Of Frame Alignment
• HTML — Hyper-Text Markup Language
• 3G HSPA — Third-Generation High-Speed Packet Access
• BSS — Broadband Switching System
• FTTP — Fiber To The Premises
• BTAM — Basic Telecommunications Access Method
• PTP — Point To point Protocol
• LMS — Location and Monitoring Service
• CDA — Communications Decency Act's
• VSC — Vertical Service Code
• SKU — Stockkeeping Unit
• VTAM — Virtual Telecommunication Access Method
• PSDN — Public Switched Digital Network
• PTP — Point to Point Transmission Service (electricity)
• LP — Line Pair
• LRQ — Location Request
• VLF — Vertical-Laminar-Flow
• DAS — Data Acquisition System
• PY — person-year
• TRMM — Tropical Rainfall Measuring Mission (US-Japan)
• CPS — Cycles Per Second (now Hertz)
• CPT — Cellular Paging Teleservice

• MMC — Microsoft Management Console (Microsoft)
• GERAN — GSM (Global System for Mobile communications) Edge Radio Access Network
• CC — Country Code
• APPC — Advanced Program-to Program Communications
• BNC — Bayonet Neill-Concelman
• 1-ESS — x-ESS series of Electronic Switching Systems
• HPN — Home Phone Network
• DAF — Directory Access Function
• BCIX — Berlin Commercial Internet Exchange
• AMA — automatic message accounting
• TLP — Transmission Level Point
• DDU — Digital Data Unit
• DS0 — Digital Signal Zero
• DMS — Defense Messaging System
• PTT — Push to Talk Taster
• MB — Measured Business
• SCCS — Switching Control Center System
• DLCI — data link connection identifier
• BY — Busy
• AB — Answer Back
• IEEE-CS — Institute of Electrical and Electronics Engineers Computer Society
• IRF — Impulse Response Function
• BDE — Borland Database Engine
• BC — Basic Call
• MTD — Moving Target Detection
• STU — Secure Telephone Unit
• NE — Network Element
• MMDS — Multichannel Multipoint Distribution Service
• BAF — Bellcore AMA (Automatic Message Accounting) Format
• LULT — Line Unit/Line Termination
• EV — electronvolt
• MSRN — Mobile Station Roaming Number
• CMT — Commercial Metering Transponder
• BSA — Basic Service Area
• LFACS — Loop Facility Assignment and Control System
• SMSC — Short Message Service Center
• PDSO — Packet Data Security Overlay
• USF — Universal Service Fund
• LVM — Line Verification Module
• B-ISDN — Broadband ISDN
• RADINT — Radar Intelligence
• ESA — Enhanced Subscriber Authentication
• CAR — committed access rate
• NSAI — National Standards Authority of Ireland
• PLE — Path Length Efficiency
• OXCO — Oven-Controlled Crystal Oscillator
• IESG — Internet Engineering Steering Group
• TBPS — Terabits Per Second
• BPP — Billed Party Preference
• ECS — Environmental Control System (Subsystem)

• SQL — Specified Quality Level
• SCH — Synchronization Channel
• SRA — Seamless Rate Adaptation
• LLA — Link Level Access
• ATU-C — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Central office end
• ASYNC — Asynchronous
• VAS — Value Added Services
• PM — Processable Mode
• DS-3 — Digital Signal, Level 3
• SMPTE — Society of Motion Picture and Television Engineers, Inc.
• UPT — Universal Personal Telecommunications
• UAT — Universal Access Transceiver
• DSSSL — Document Style Semantics and Specification Language
• OWS — Operator Work Station
• CES — Circuit Emulation Service
• LCAS — Link Capacity Adjustment Scheme
• SPA — Special Prorate Agreement
• ERL — Echo Return Loss
• NSAP — Network Service Access Point
• NMS — NetWare Management System
• GFC — Generic Flow Control (ATM)
• FEAC — Far End Alarm and Control
• TACACS — Terminal Access Controller Access Control System
• UCM — Use Case Map
• MTS — Message Transmission Subsystem
• WNAP — Wireless Network Access Point
• D3 — Digital channel bank, Third generation
• HSCSD — High-Speed Circuit-Switched Data
• ASE — Application Service Element
• NT — New Technology, also Windows NT
• TTY — teletype terminal
• WK — Week
• HSCSWD — High-Speed Circuit-SWitched Data
• FIOS — Fiber Optic Services
• MCR — Minimum Cell Rate (ATM)
• DMT — Discrete Multi-Tone
• DMT — Discrete Multi-Tone Technology
• GTB — Global Telecom Brokers
• BUFR — Binary Universal Form for the Representation (of data)
• NCAR — National Center for Atmospheric Research (US)
• PLCP — Physical Layer Convergence Procedure
• S/N — Signal-to-Noise ratio
• CLP — Cell Loss Priority (ATM)
• SS1 — Signalling System 1 (500/20 Hz tones)
• CBQ — Class-Based Queuing
• CGI — Cell Global Identity
• MGCP — Multimedia Gateway Control Protocol
• BHCC — Busy Hour Call Completions
• CSR — Customer Service Request
• B-CPE — Broadband Customer Premises Equipment

• DCS — Defense Communications System
• MAG — Mobile Access Gateway
• L2TP — Layer 2 Tunneling Protocol
• SIO — Service Information Octet
• PIC — Programmable Interrupt Controller
• IDLC — Integrated Digital Loop Carrier
• AAS — Automatic Announcement Subsystem
• PTT — Push to Talk Testing
• TRX — Tandem Repeater eXchange
• DL — Downlink Message
• LBR — Low Bit Rate
• RIPE NCC — Reseaux IP Europeens Network Coordination Centre
• CDA — Communications Decency Act of 1996
• IOC — Interoffice Channel
• ISC — International Switching Center
• NMC — Network Management Center
• E — Echo Time Zone
• CSAR — Combat Search and Rescue
• UBR — Unspecified Bit Rate
• VADB — Virtual Auto Dial Backup
• CDV — Compressed Digital Video
• EVC — Electronic Voucher Charging
• MPLS — Multi Protocol Label Switching
• TDR — Time-Domain Reflectometry
• AMP — amplifier / amplification
• GSM — Groupe Speciale Mobile
• ESN — Electronic Serial Number
• AAL — ATM (Asynchronous Transmission Mode) Adaptive Layer
• ASTD — American Society of Training and Development (Alexandria, Virginia)
• ESPN — Entertainment and Sports Programming Network
• ANSI-41 — ANSI standard for mobile management
• LSAP — Link Service Access Point
• SDP — Session Description Protocol
• SMU — Service Management Unit
• ACM — Address Complete Message
• CEE — Communaut? Economique Europ?enne
• N-AMPS — Narrowband Advanced Mobile Phone System
• SINAD — SIgnal-to-(Noise And Distortion) ratio
• OSD — Onscreen Display
• WAR — Wireless Access Revolution
• ATIS — Automatic Transmitter Identification System
• IPRC — Intellectual Property Rights Committee
• NFR — Near-Field Recording
• RBS — Robbed Bit Signaling
• IV&V — independent verification and validation
• RJ-14 — Registered Jack type 14 (2-wire connector)
• LSC — Link State Control
• BNCC — Base Network Control Center
• CPN — Customer Premise Network
• NCOS — Network Class Of Service

• DXI — Data Exchange Interface
• AEA — American Electronics Association's
• 3GIP — Third Generation Internet Protocol
• IEEE-SA — Institute of Electrical and Electronics Engineers - Standards Association
• MTI — Moving Target Indicator
• DCO — Dial Central Office
• BTP — Business Telecom Products, Inc.
• WFG — Wireless Firewall Gateway
• AMTFT — Active Matrix Thin Film Transistor
• FFH — Fast Frequency Hopping
• SR — Scanning Radiometer
• 4 GIG — 4 Giga Intellectual Gadget
• DDLD — Direct Dial Long Distance
• GBPS — Gigabits per second
• FOC — Fiber-Optic Cable
• ALCAP — Access Link Control Application Protocol
• DLT — Delete
• DSCS — Defense Satellite Communication System
• BPSK — Binary Phase-shift Keying
• RRC — Root Raised-Cosine
• MMSI — Maritime Mobile Service Identity
• TSR — Terabit Switch/Router
• LAAS — Local Area Augmentation System
• FEM — Finite Element Method
• DCC — Digital Control Channel
• RQMTS — Requirements
• SVI — Service Interception
• FTAM — File Transfer Access and Management
• TDRSS — Tracking and Data Relay Satellite System
• SES — Scientific and Engineering Software
• NCP — Network Control Program
• DMT — Discrete Multi-tone Transmission
• FGDC — Federal Geographic Data Committee's
• PMT — Photo Multiplier Tube
• DCEF — Distributed Cisco Express Forwarding
• SPI — Security Parameters Index
• FSAI — Fiber Serving Area Interface
• ATRAC — Adaptive Transform Acoustic Coding
• SETI — Search for Extraterrestrial Intelligence
• TSDU — Transport Service Data Unit
• GSTN — General Switched Telephone Network
• IDCU — Integrated Digital Carrier Unit
• DNA — Do Not Answer
• DAC — Digital to Analog Converter-Audio
• TTL — ToS and Time-to-Live
• OMA — Open Mobile Alliance
• UIH — Unnumbered Information with Header check
• MAC — Message Authenticity Check
• SYM — Symmetric
• SPE — Synchronous Payload Envelope

• CU — Cooling Unit
• ALT — Automatic Link Transfer
• BT — Bluetooth Tablet
• PMOS — P-channel Metal Oxide Semiconductor
• MBS — Maximum Burst Size (ATM)
• HFC — Hybrid Fiber Coaxial
• VSM — Vestigial Sideband Modulation
• MEH — Mobile-Executed Handoff
• CEPT — Conférence Européenne des Administrations des Postes et des Télécommunications
• CNID — Calling Number Identification Display
• MTA — Message Transfer Agents (Internet)
• IDCP — Internet Device Control Protocol
• HUMAN — High-speed Unlicensed Metropolitan Area Network
• GMSS — Global Mobile Satellite System
• ACEK — Authentication Encryption Key
• TRIG — Trigger
• SAM — Service Access Multiplexer
• P2P — Person-to-Person
• SS7 — Signaling System 7
• CQ — Communications Quality
• PMMA — Polymethyl Methacrylate
• COBE — Corporate Owned Business Only
• DICOM — Digital Imaging and Communications in Medicine
• BAN — Billing Account Number
• CLASS — Cell Level ATM (Asynchronous Transfer Mode) Services Simulator
• RCT — remote Control Terminal
• VISSR — visible and infrared spin scan radiometer (GOES)
• PIM — Protocol Independent Multicast
• VFL — Visual Fault Locator
• CS — Connection Segment
• ODS — Operational Data Store (knowledge management)
• LN — Line
• BIC — Bus Interface Controller
• EPP — Enhanced Parallel Port (PC)
• COAM — Customer Owned And Maintained
• CSP — Continuous Speech Processing
• CCLC — Carrier Common Line Charge
• SGS — Software Generation System
• PCS — Personal Communications Services
• UDT — Unreliable Data Transfer
• TSGR — Transport System Generic Requirements
• PSN — Public Switched Network
• TIA — Telecommunications Industry Association
• FLL — Fixed-Loss Loop
• DUV — Data-Under-Voice
• FPLMTS — Future Public Land Mobile Telecommunications System
• SMMR — Scanning Multichannel Microwave Radiometer
• PET — positron emission tomography
• TDM — Time Division Multiplexing
• SR — Slow Release

• QOD — Quality of Data
• AMTI — Airborne Moving Target Indicator
• MMS — Multimedia Message Service
• BCSM — Basic Call State Model
• CSDU — Core Service Data Unit
• NWK — Network
• DUV — Deep Ultraviolet
• V — Vector
• STM — Synchronous Transfer Mode
• SIMT — Système interbancaire marocain de télécompensation
• NLM — NetWare Loadable Module
• TACS — Total Access Cellular System
• FD — Full Duplex
• ATCA — Advanced Telecom Computing Architecture
• OCC — Occupancy
• DTR — Down-Time Ratio
• SMS — System Management Server
• QOI — Quality of Information
• ITA — Illinois Telecommunications Association
• DLU — Digital Line Unit
• MTP — Message Transfer Part
• OIM — Operations Interface Module
• MAJ — Major
• FOTS — Fiber Optical Transmission System
• CCITT — Comite Consultatif International Telegraphique et Telephonique (now ITU-T)
• WCDMA — Wideband Code Division Multiple Access
• BB — Blackberry
• OCI — object code insertion
• MOS — Metal Oxide Semiconductor (FET Devices)
• TSC — Technical Standards Committee
• UNI — User-Network Interface
• DEM — Digital Elevation Model
• ACA — Automatic Circuit Assurance
• LMDS — Local Multipoint Distribution Service
• TARP — Target Identifier Address Resolution Protocol
• ASAS — All-Source Analysis System
• VGF — Voice Grade Facility
• BHP — Burst Header Packet
• DW — Deep Water
• USF — Universal Server Farm
• DPNSS — Digital Private Network Signaling System
• BAOC — Barring of All Outgoing Calls supplementary service
• APS — Advanced Power System
• AECT — Association for Educational Communications and Technology's
• DSP — Data Service Provider
• AIU — Analog Interface Unit
• 3GSM — Third-generation Global System for Mobile (communications)
• NW — North West
• A/D — Analog-to-Digital converter
• NTU — Network Termination Unit

• HDTV — High-Definition Television
• URN — Uniform Resource Namespace
• BSRF — Basic System Reference Frequency
• DPST — Double-Pole Single-Throw
• STA — Science and Technology Agency (Japan)
• SAPI — Service Access Point Identifier
• ROW — Rest Of World
• SPT — System Page Table
• DNU — Do Not Use
• DFE — Design For Environment
• SDN — Software Defined Network
• CGI — Computer Graphics Interface
• CLF — Carrier Line Failure
• AFRINIC — African Network Information Centre
• CVT — Circuit Validation Test
• HDB3 — High-Density Bipolar Three-bit substitution
• AMR — Automated meter reading also known as Automatic Meter Reading
• DECT — Digital Enhanced Cordless Telecommunication
• TM — Thematic Mapper (Landsat)
• IVP — Integrated Voice Protocol
• NEMP — Nuclear Electromagnetic Pulse
• MILNET — Military Network
• BT — Back Trace
• LQC — Line Quality Control
• TSD — Type Specific Driver
• ACNA — Access Customer Name Abbreviation
• SRS — Supported Residential Services
• SAR — Segmentation and Reassembly (ATM)
• LMS — Local Measured Service
• CDDI — Copper Distributed Data Interface
• FIFO — first-in, first-out
• SEM — Scanning Electron Microscopes
• OOK — On/Off Keying
• LDI — Long Distance Interconnect
• MSI — Maritime Safety Information
• FTS — Federal Telecommunications System
• SFN — Single Frequency Network
• IPXCP — Internetwork Packet Exchange Control Protocol
• SA — Selective Availability (on GPS transmissions)
• CAN — Controller Area Network
• ZD — Zero Defects
• IR — Information Request
• PLCP — Physical Layer Convergence Protocol (ATM)
• CAM — Computer-Aided Manufacturing
• DACS — Digital Access and Cross-Connect System
• ESP — Essential Service Protection
• CSA — Canadian Standards Association (like UL)
• VXML — Voice eXtensible Markup Language
• RADSL — Rate Adaptive Digital Subscriber Line
• DNC — Do Not Call

• DCA — Distributed Communications Architecture
• TELNET — Telecommunications Network Protocol
• DACS — Digital Access Carrier System
• BSVCI — Broadcast Signaling Virtual Channel Identifier
• CODASYL — COnference on DAta SYstems Languages
• ALI — Automatic Location Identifier
• LCGN — Logical Channel Group Number
• RSN — Regional Service Network
• MAPDU — Management Application Protocol Data Unit
• CSI — Clearing Subnetwork Identification
• BTS — Base Transceiver Station (cellular)
• MUSIC — MUltiple SIgnal Classification
• CERN — Conseil Europeen Pour La Recherche Nucleaire
• MDCP — Media Device Control Protocol
• RS-422 — Recommended Standard 422 (ANSI/EIA standard for transmitting serial data)
• TOMS — Telecom Operations Management System
• ECC — Emergency Communications Center
• GOMP — Get Off My Phone
• AIS-V — Alarm Indication Signal - Virtual
• CF — Coin First Payphone
• PSQM — Perceptual Speech Quality Measure
• SR — Service Request
• OLS — Optical Line System
• PCIA — Personal Communications Industry Association
• EMS — Enhanced Messaging Service
• ARD — Automatic Ring Down
• CW — Call Waiting Supplementary Service
• WDMW — Web Directory for Mobile and Wireless
• ARPT — Autorité de Régulation des Postes et Télécommunications
• EA — expedited acknowledgement
• AGCH — Access Grant Channel
• PSC — Picture Start Code
• CFOT — Certified Fiber-Optic Technician
• NARC — Non-Automatic Relay Center
• APR — Alarm Processing Remote
• LRB — Loop Reverse Battery
• DMI — Desktop Management Interface (computing)
• ANSI — Advanced Network Signaling Input
• CSAA — Central Service Area Authority
• DNI — Data Network Interface
• MED — Manipulative Electronic Deception
• BATM — Basic Telecommunication Access Method
• BTO — Betts Telecom Oklahoma
• CTTC — Centre Tecnològic de Telecomunicacions de Catalunya
• ADTS — Ameritech Digital Transport Service
• TPF — Transmission Priority Field
• CAMEL — Customized Applications for Mobile-network Enhanced Logic
• SCC — Signal Conversion Circuit
• PTM — Point-To-Multipoint
• MBE — Molecular Beam Epitaxy

• M/W — MicroWave
• PNE — Path Number Efficiency
• AS — Active Service
• SDCCH — Standalone Dedicated Control Channel
• SFX — Special Effects
• JMA — Japanese Meteorological Agency
• GRX — GPRS Roaming Exchange
• ANT — ADSL Network Terminator
• CCC — CDMA Cluster Controller
• EADAS — Engineering and Administrative Data Acquisition System
• BDSL — Broadband Digital Subscriber Line
• DORK — Disciples Of The Righteous King
• PSK — Phase Shift Key
• QEDI — Quod Erat Demonstrandum
• MDN — Mobile Directory Number
• VRT — Voltage Reduction Technology
• RCMAC — Recent Change Memory Administration Center
• BHCA — Busy Hour Call Attempts
• CACM — Communications of the ACM
• VGC — Voice Grade Channel
• ADPCM — Adaptive Differential Pulse Code Modulation
• C² — Command and Control
• Z — Zulu Time
• SNIX — Single Noise Interference Xterminator
• ACU — Automatic Calling Unit
• PNP — Positive-Negative-Positive
• ULP — Upper Layer Protocol
• UMTS — Universal Mobile Telecommunications Standard
• FELB — Far-End Loop Back
• CT — Control terminal
• CLEC — Competitive Local Exchange Carrier
• NICT — National Institute of Information and Communications Technology
• LSP — Label Switched Path
• LOP-P — Loss Of Pointer - Path
• ADTS — Automated Digital Terminal System
• DSU — Digital Service Unit
• WSP — Wireless Service Provider
• WCMP — Wireless Control Message Protocol
• RYP — Russian Yellow Pages
• DLT — Digital Line Termination
• CALA — Customer Address Location Area
• MLA — Modern Language Association
• APS — American Protective Services
• DBRNC — deciBel Relative to Noise in a Circuit
• NESC — National Electrical Safety Code
• ATSC — Advanced Television Systems Committee
• TC — Technical Committee (HL7)
• DLC — Digital Leased Circuit
• IOS — Internet Over Satellite
• EST — Electroshock Therapy

• UTP — Universal Transmission Protocol
• NMC — Network Model Coverage
• SHR — Self-Healing Ring
• ISP — International Signaling Point
• DCSS — Digital Cross-connect Systems
• ECDIS — Electronic Chart Display Information System
• ASP — Active Signaling Protocol
• DOITT — Department of Information Technology and Telecommunications
• ICLD — Inter-Channel Level Difference
• INAP — Intelligent Network Application Part
• RBT — Ring Back Tone
• DMT — Digital-Discrete Multi-Tone
• TTC — Telemetry Telecommand and Control
• BSSMAP — Base Station System Management Application Part
• 100VG — 100 Voice Grade (IEEE 802.12 AnyLAN Standard)
• FRF-LMI — Frame Relay Forum - Local Management Interface
• EMV — EuroPay, MasterCard, Visa
• SMG — Super Master Group
• LEED — Low-energy Electron Diffraction
• LMT — Lightwave Microcell Transceiver
• WAW — Wide Area Wireless
• GSM — Global System for Mobile telecommunications
• CEPT — Conference of European Posts and Telecommunications
• TFL — Telecom Fiji Limited
• ISD — International Subscriber Dialling
• MEECN — Minimum Essential Emergency Communication Network
• FAW — Frame Alignment Word
• MP — Master Processor
• CDR — Common Data Rate
• ATU-R — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Remote terminal end
• ILETS — International Law Enforcement Telecommunications Seminar
• CAL — Customer Access Line
• * — Star, special function key
• DPT — Dial Pulse Terminate
• MQFP — Metric Quad Flat Pack
• PRM — Performance Report Message
• SINS — Ship’s Inertial Navigation System
• RCF — Remote Call Forwarding
• RNR — Receive Not Ready
• CL — cell loss
• DCB — Digital Channel Bank (Sprint)
• EDGE — Enhanced Data for GSM (Global System for Mobile communication) Evolution
• ATR — Advanced Telecommunications Research Institute
• E2E — End-to-End
• OID — Object Interaction Diagram
• BRAN — Broadband Radio Access Network
• ADM 3X — DS3 Add-Drop Multiplex
• CMAS — Cellular Management System
• DF — Direction Finding or Finder
• WPBX — Wireless Private Branch Exchange

• CCH — Common Channel Handler
• USRT — Universal Synchronous Receiver/Transmitter
• DEO — Digital End Office
• DBN — Dial-Back Number
• ARAI — Adjunct Route Application Interface
• LAT — Local Area Transport (network)
• TSI — time-slot interchange
• E-TDMA — Expanded Time Division Multiple Access
• FEBE — Far End Block Error (SONET)
• DLE — Digital Local Exchange
• SCO — Synchronous Connection Oriented
• VOFR — Voice Over Frame Relay
• F/W — Firmware
• L2F — Layer 2 Forwarding protocol
• BANC — Broadband Access Network Coordination
• MM — Multimode (fiber optic cable)
• AEIMP — Apple Event Interprocess Messaging Protocol
• CVSD — Continuous Variable Slope Detection
• KEK — Key Encrypting Key
• RFI — Remote File Inquiry
• KSPS — KiloSymbols Per Second
• WBMP — Wireless Bitmap
• CONS — Connection-oriented Network Services
• HTO — Hellenic Telecommunications Organisation
• TAE — Terminal Adapter Equipment
• PHY — Physical Layer
• AAL2 — ATM (Asynchronous Transmission Mode) Adaptation Layer 2
• CAAS — Communications-as-a-Service
• FOE — Fiber Optic Equipment
• LRF — Laser Range Finder
• ADM — Administration, Office of
• DS-1 — Digital Signal, Level 1
• SLC — Service Level Contract
• AIS-L — Alarm Indication Signal - Line
• W-CDMA — Wideband Code Division Multiple Access
• NSN — National Significant Number
• DTW — Dynamic Time Warping
• RSI — Record Status Indicator
• EF&I — Engineering, Furnishing and Installation
• EFRC — Enhanced Full Rate Codec
• AIS-P — Alarm Indication Signal - Path
• MCPC — Multiple Channels Per Carrier
• CCSA — Common Control Switching Arrangement
• DRTT — Dial Repeating Tie Trunk
• WAGN — West Antarctic GPS (Global Positioning System) Network
• RU — Release Unit
• MIS — Management Information Service
• TD-CDMA — Time Division - Code Division Multiple Access
• CLIP — Caller Line Identification Presentation
• APTC — Atlantic Provinces Telecommunications Council

• AL — Alignment
• CMOS — Cellular Management Operation System
• RCR — Research and Development Center for Radio Systems
• CLOS — Clear Line Of Sight
• GOS — Gerry Otis Simpson
• ISO — Independent System Operator (US) (see also TSO) Responsible for grid management, but does not own assets. (electricity)
• WCRL — Wireless Communications Research Laboratory
• CASE — Computer-Aided Software Engineering
• MOA — Managed Object Agent
• CFNA — Call Forwarding No Answer
• SDHLR — Super-Distributed Home Location Register
• IPTD — Internet Protocol Telephony Design
• CLI — Calling Line Identification
• 4G — Fourth Generation
• LEC — Liquid Encapsulated Czochralski
• MIC — Management Integration Consortium
• AVT — Audio Visual Telecommunications
• RADARSAT — Radar Satellite
• ECTF — Enterprise Computer Telephony Forum
• CMM — Calls, Minimums, Maximums
• CCR — Current Cell Rate (ATMF)
• WUP — Wired Up Privacy
• CD — Committee Draft
• AH — Authentication Header
• ASA — Avaya Site Administration
• CM — Common Mode
• ACL — Asynchronous Connection-less Link
• WPKI — Wireless Public Key Infrastructure
• NSE — Network Software Environment
• DCS — Digital Cross-connect Switch
• TRLR — Trailer
• LUNT — Line Unit Network Termination
• CIPOA — Classical Internet Protocol over ATM (Asynchronous Transfer Mode)
• BHA — Busy Hour Attempts
• SNI — Service Node Interface
• WIG — Wireless Internet Gateway
• CD-ROM — Compact Disk-Read-Only Memory
• EIR — Excess Information Rate
• AEE — Agent Execution Environment
• WAWS — Washington Area Wideband System
• PFE — Power Feed Equipment
• IXC — interexchange carrier
• JWG — Joint Working Groupof
• FWS — Fixed Wireless Services
• STDM — Statistical Time Division Multiplexing
• SASL — Simple Authentication and Security Layer
• NTSC — National Television Standards Committee
• DCMES — Dublin Core Metadata Element Set
• APTG — Asia Pacific Telecom Group
• CTE — Computer Telephony Engine

• ATMS — automatic transmission measuring system
• SACS — Security Access Control System
• VCT — Variable Cam Timing
• TMSI — Temporary Mobile Subscriber Identity
• WFT — Wireline Formation Test
• # — Number sign, octothorp; special function key
• MOC — Maintenance and Operations Console
• BFS — Broadcast File System
• MIN — Mobile Identification Number
• MHL — Mobile High-definition Link
• VAD — Voice Activity Detection
• MBMS — Multimedia Broadcast/Multicast Service
• ACRE — Authorization and Call Routing Equipment
• ICI — Interexchange Carrier Interface
• VC — Virtual Circuit (ATM)
• IPC — Initial Paging Channel
• GPBX — Global Private Branch eXchange
• IPCU — iPhone Configuration Utility
• JWP — Joint Working Party
• UOS — Units of Service
• WGX — Wireless Gateway Switch
• STE — Syrian Telecommunications Establishment
• NSDI — National Spatial Data Infrastructure
• THL — Trans-Hybrid Loss
• BS — Busy Season
• DX — Duplex Signaling
• MMC — Minimum Monthly Charge
• TTIL — Team Telecom International Ltd.
• CNE — Certified Novell Engineer
• CCSS6 — Common Channel Signaling System # 6
• NAP — Network Access Point
• OODBMS — Object-Oriented Database Management Systems
• PTO — U.S. Patent And Trademark Office
• DDSD — Delay Dial Start Dial
• DE — Discard Eligible
• CTSO — Cellular Telephone Service Order
• GTXC — Global Telephone Exchange Carrier
• ADIF — Accounting Data Interchange Format
• TRANS — Transaction
• SVC — Single Voice Coil
• HQGSM — High-Quality Global System for Mobile communications
• ACL — Average Call Length
• DPDCH — Dedicated Physical Data Channel
• BCM — Bit Compression Multiplexer
• BTN — Billing Telephone Number
• CTIT — College of Telecommunications and Information Technology
• AA — Auto-Answer
• GOSIP — Government Open System Interconnection Profile
• RAI — remote alarm indication
• E — Exchange

• JISC — Japanese Industrial Standards Committee
• MOD — Modulo
• EGPRS — Enhanced General Packet Radio Service
• DM — Design Manager
• DORA — EV-DO (EVolution-Data Optimized) standard Revision A
• MAU — Multistation Access Unit
• AFI — Authority and Format Identifier
• MEAS — Measure
• WDF — Wireless Data Forum
• MSC — Mobile Switching Center
• CPS — Customer Premises System (Bellcore)
• HSC — High Speed Connect
• BUS — Broadcast and Unknown Server
• VPC — Virtual Path Connection (ATM)
• SMT — station management (protocol)
• SM — Statistical Multiplexing
• OC-1 — Optical Carrier Signal, Level 1
• CR — Connection Request
• MFAS — Multi-Frame Alignment Signal
• LTU — Line Termination Unit
• GTM — Go to Meeting
• ATL — Advanced Technology Laboratory
• MTS — message transport system
• 4WE&M — Four-Wire Ear and Mouth
• SLIC — Subscriber Loop Interface Circuit
• DCP — Distributed Collaborative Planning
• ACOU — Additional Call Offering Unrestricted
• DF — Distributing Frame
• KTS — Key Telephone System
• ISSI — Inter-Switching System Interface
• MVDS — Microwave Video Distribution System
• MEID — Mobile Equipment Identifier
• SYNC — Synchronization
• NARSAP — National Advanced Remote Sensing Application Program
• EEHO — Either End Hop Off
• DTU — Data Terminal Unit
• ML-PPP — Multilink Point-to-Point Protocol
• NRZ — Nonreturn To Zero
• ACMA — Atlantic Cable Maintenance Agreement
• DIP — Dialup Internet Protocol
• DFRI — Datacom Reference Frame Input
• VF0 — Voice Fundamental Frequency
• REG — range extender with gain
• WWAN — wireless wide-area network
• BSC — Base Station Controller
• INWATS — INward Wide Area Telecommunications Service
• DVCC — Digital Verification Color Code
• CATI — Computer-Assisted Telephone Interviewing
• AAV — Alternative Access Vendor
• DTU — Date/Time Update

• ATACS — Army Tactical Communications System
• VHM — Voice Health Monitor
• DDS — Dataphone Digital Service (AT&T)
• MO — Magneto-optic
• MERIS — medium-resolution imaging spectrometer
• RLS — Recursive Least Squares
• TJB — Telephone Junction Box
• AFIPS — American Federation of Information Processing Societies
• VGCP — Voice Grade Channel Processor
• DMB — Disconnect and Make Busy
• COI — Community of Interest
• HFT — Human Factors in Telecommunications
• CUSA — Central Urban Service Area
• PTM — Packet Transport Mode
• EDT — European Deaf Telephone
• FEFA — Far End Failure
• HPPI — High-Performance Parallel Interface
• SCORM — Shareable Content Object Reference Model
• RZ — Return to Zero
• AI — Airborne Interception
• LR-WPAN — Low-Rate Wireless Personal Area Network
• DTS — Digital Terminal Systems
• NMC — Nortel Matra Cellular
• JSC — Joint Scientific Committee (ICSU, WCRP, and WMO)
• LIU — Line Interface Unit
• UASL — Unified Access Service License
• RLC — Radio Link Control
• CPC — Crosstalk Prevention Coding
• ESG — Enhanced Service Gateway
• LORAN — Long Range Aid to Navigation System
• ATL — Atlanta
• BCS — British Computer Society
• QPA — Quality Performance Analysis
• PTT — Post Telegraph and Telecommunications
• CARS — Community Antenna Relay Service
• DRTL — Dial Repeating Tie Line
• VTAC — Vermont Telecom Advancement Center
• REA — Rural Electrification Administration (US)
• CDRM — Cross-Domain Resource Manager
• DLCS — Digital Loop Carrier System
• EC — Entropy Coding
• ICTA — Idaho Cable Telecommunications Association
• IMPI — IP (Internet Protocol) Multimedia Private Identity
• ATTRA — Appropriate Technology Transfer for Rural Areas
• SQE — Signal Quality Error
• LAPB — Link Access Protocol-Balanced
• TCL — Transverse Conversion Loss
• ITOC — Independent Telephone Operating Company
• SSU — Synchronization Supply Unit
• LSF — Line Spread Function

• AGPS — Assisted Global Positioning System
• CSL — component sublayer
• CRL — Computing Research Laboratory
• PT — Payload Type (ATM)
• AARQ — A-Associate Request
• CFS — Call for Service
• TRAC — Totally Reconfigurable Analog Circuit
• TANE — Telephone Association of New England
• UMTS — Universal Mobile Telecommunication System
• NAM — Number Assignment Module
• MODEM — modulation and demodulation
• STN — Station Casinos, Inc.
• FRAD — Frame Relay Assembler/Disassembler
• LAC — Line Assignment Center
• DISA — Direct Inward Switch Access
• NAM — Numeric Assignment Module
• UDC — Universal Digital Channel
• DMI — Digital Multiplex Interface
• CFS — Customer Facing Services
• FCFS — First-Come, First-Served
• WTP — Wireless Transaction Protocol
• CYTA — Cyprus Telecommunications Authority
• STD — Secondary Telecom District
• RFA — Recurrent Fault Analysis
• MNP — Microcomputer Networking Protocol
• SLBM — Submarine-launched ballistic missile
• PSO — Professional Services Organization
• TVRO — Television Receive-Only
• BTE — Broadband Terminal Equipment
• AADS — Ameritech Advanced Data Services
• OST — Office of Science and Technology
• SUBT — Subscriber Terminal
• UPC — Usage Parameter Control
• MTBM — Mean Time Between Maintenances
• JDC — Japan Digital Cellular
• RCH — Receive Channel
• LSMS — Local Service Management System
• PTI — Payload Type Indicator
• AUSPI — Association of Unified Telecom Service Providers of India
• LQR — Line Quality Report
• IDEN — Integrated Dispatch Enhanced Network
• USPI — Universal Serial Phone Interface
• FICORA — Finnish Communications Regulatory Authority
• PSLV — Polar Satellite Launch Vehicle (Indian Space Research Organization; India)
• LFTYR — Ley Federal de Telecomunicaciones y Radiodifusión
• WTA — Wireless Telephony Application
• SDLC — Systems Development Life Cycle
• PTCL — Pakistan Telecommunication Company Ltd
• TBRL — Terminal Balance Return Loss
• IMTS — Improved Mobile Telephone Service

• DUNCE — Dial-Up Networking Connection Enhancement
• IVI — Intel Video Interactive
• FEBE-F — Far End Block Error count - Fast data
• STM — Scanning Tunneling Microscopy
• ETSI — European Telecommunications Standards Institute
• VCC — Voice Call Continuity
• DSP — Domain Specific Part
• PAGCH — Paging and Access Grant Channel
• GVPN — Global Virtual Private Network
• FEBE-I — Far End Block Error count - Interleaved data
• IQ — In-phase and Quadrature
• ULC — Universal Line Card
• TPSP — Third Party Service Provider
• DOV — Data-Over-Voice
• NQA — Niveau de Qualite Acceptable
• DS-2 — Digital Signal, Level 2
• IRAC — Interdepartment Radio Advisory Committee
• FECC-F — Forward Error Correction Count - Fast data
• NETBIOS — Network Basic Input-Output System
• NECA — National Exchange Carrier Association
• TEM — Transmission Electron Microscope
• OC-96 — Optical Carrier Signal, Level 96
• FIC — Flight Information Center
• ALC — Automatic Line Controller
• DAS — Distributed Antenna System
• DLIS — Directory Listing Inquiry System
• ML — maximum length
• CDPD — Cellular Digital Packet Data
• 2G — Second-generation mobile telephone system
• CUG — Closed Users Group
• ISM — Interstellar Medium
• STD — Standard Deviation
• CITR — Canadian Institute for Telecommunications Research
• EA — Emergency Action (JOC)
• DOR — Detailed Outage Report
• PTAM — Professional Telephone Answering Machine
• BABT — British Approvals Board for Telecommunications
• WDS — Wireless Distribution System
• WDRM — Wireless Design Reference Manual
• SMDR — station message detail recording
• UPS — Un-interruptable Power Supply
• LOB — Line Of Bearing/Balance
• RM-ODP — Reference Model for Open Distributed Processing
• N-AMPS — Narrowband Advanced Mobile Phone Service
• ONE — Other Network Entity
• 888 — Freephone
• RSL — Request and Status Links
• RDSS — Radio Determination Satellite Service
• LSI — Large-Scale Integration
• WEDE — Wireless Enterprise Delivery Environment

• ICR — Intelligent Call Routing
• DTC — Department of Telecommunications and Cable
• SWF — SWitched Fractional
• CNI — Calling Number Identification
• RANAP — Radio Access Network Application Part
• WSN — Wireless Sensor Network
• BUS — Business Units
• NSM — Network Status Monitor
• CMS — Conversational Monitor System
• MEOS — Medium Earth Orbit Satellite
• MRCA — Most Recent Common Ancestor
• LTU — Line Terminating Unit
• GOSIP — Government Open Systems Interconnection Profile
• DPCM — Differential Pulse Code Modulator
• ASTE — Advanced Systems and Telecommunications Equipment
• IBS — In-Building Solutions