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Computing & IT >> Telecom Abbreviations

Look through 4999 acronyms and abbreviations related to Telecom:

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

• AUP — Acceptable Use Policy
• UK — United Kingdom of Great Britain and Northern Ireland
• F2F — Face To Face (also Meeting In Person)
• IRC — Internet Relay Chat
• TEMIP — Telecommunications Management Information Platform
• IAMAI — Internet and Mobile Association of India
• RF — Radio Frequency
• WWW — World Wide Web
• BTW — By The Way
• OEM — Original Equipment Manufacturer (usually in reference to car parts)
• DND — Do Not Disturb
• DAC — Discretionary Access Control
• CDR — Critical Design Review
• BVR — Beyond Visual Range
• ECU — Electronic Control Unit
• TNYWR — The Number You Will Receive
• RFQ — Request For Quotation
• FEMA — Federal Emergency Management Agency
• BPM — Beats Per Minute
• DBORS — Data Base of Records
• QC — Quality Control
• LCD — Liquid Crystal Display
• WTG — Way To Go
• CUG — Closed User Group
• ISO — International Organization for Standardization
• AFAIK — As Far As I Know
• CSA — Canadian Space Agency
• IP — Internet Protocol
• EDI — Electronic Data Interchange
• DSCP — Differentiated Services Control Point
• EAP — Employee Assistance Program
• C4I — Command, Control, Communications, Computers, & Intelligence
• PDR — Preliminary Design Review
• GSM — Global System for Mobile Communications
• SAR — Search And Rescue
• UDP — User Datagram Protocol (FDDI related)
• AC — Alternating Current
• FET — Field Effect Transistor
• IRL — In Real Life
• ACC — Adaptive Cruise Control
• PSK — phase-shift keying
• ATM — Automatic Teller Machine
• CCSDS — Consultative/Consultative Committee for Space Data Systems
• MBR — Master Boot Record
• CCM — counter-countermeasure
• LRU — Line Replaceable Unit
• ESA — European Space Agency
• ACK — ACKnowledgment
• DFD — Displaced Frame Difference
• ABI — Application Binary Interface

• BIP — Bit-Interleaved Parity
• CCB — Change Control Board
• COB — close of business (End of duty day)
• CY — Calendar Year
• WML — Wireless Markup Language
• QFSK — Quadrature Frequency Shift Keying
• DBMS — Database Management System
• WWW3 — World Wide Web Consortium
• ACH — Automated Clearing House
• AATSR — Advanced Along-Track Scanning Radiometer
• CD — Compact Disc
• PPM — parts per million
• NOS — Network Operating System
• POC — Point Of Contact
• ACE — Access Control Entry
• IRR — Internal Rate of Return
• BUR — Bandwidth Usage Redundancy
• RPI — Retail Price Index
• 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.
• WEP — Wired Equivalent Privacy
• LRJ — Location Reject
• NMSE — Normalized Mean Square Error
• ATTN — Attention
• TQM — Total Quality Management
• ISP — Internet Service Provider
• VM — Voice Mail
• CV — Curriculum Vitae
• VAT — Value Added Tax
• EIS — Executive Information System
• ASA — American Standards Association
• RFP — Request For Proposal
• NFS — Network File System
• WDM — Wavelength Division Multiplexing (fiber optics)
• SMTP — Simple Mail Transfer Protocol
• GIS — Geographic Information System
• GATT — General Agreement on Tariffs and Trade (government)
• BTU — British Thermal Unit
• ATA — Area Transportation Authority
• CEO — Chief Executive Officer
• LLC — Limited Liability Company
• HTTP — Hypertext Transfer Protocol
• RWR — Radar Warning Receiver
• SDMA — Space Division Multiple Access
• FM — frequency modulation
• ASME — American Society of Mechanical Engineers
• CS — Computer Science
• FAR — Federal Aviation Regulation
• MB — Megabyte
• PDA — Personal Digital Assistant
• MOU — Memorandum of Understanding (an MOU between Food & Drug Administratin and a regulatory agency in another country allows mutual recognition of inspections)

• AIS — Automated Information System
• AES — Advanced Encryption Standard
• EOM — End Of Message
• ACO — Additional Call Offering
• R&D — Research & Development
• MMS — Multimedia Messaging Service
• PDH — Plesiochronous Digital Hierarchy
• ALC — Automatic Level Control
• CGI — Common Gateway Interface
• DDD — Direct Distance Dial
• Y2K — Year 2000
• WBS — Work Breakdown Structure
• ADSL — Asymmetric Digital Subscriber Line
• ATM — Asynchronous Transfer Mode
• PDT — Pacific Daylight Time
• APT — Automatic Picture Transmission
• BSD — Berkeley Software Distribution
• RDY — Ready
• ASTM — American Society for Testing and Materials (Philadelphia, Pennsylvania)
• CAUCE — Coalition Against Unsolicited Commercial Email
• STS — Space Transportation System
• DSA — Digital Signature Algorithm
• ADD — Addendum
• AIR — Account Information and Refill
• AAC — Advanced Audio Coding
• BRB — Be right back
• PDF — Portable Document Format (created by Adobe Acrobat)
• THX — Thanks
• HSD — High Speed Data
• MST — Mountain Standard Time
• FIFO — First In, First Out
• ABC — activity based costing
• MRI — Magnetic Resonance Imaging
• ACD — Automatic Call Distributor
• WAN — Wide Area Network
• API — Application Programming Interface
• ATCRBS — Air Traffic Control Radar Beacon System
• COR — Carrier Operated Relay
• PUHU — Pick Up Hang Up
• AES — Auger Electron Spectroscopy
• X-BAR — Crossbar telephone exchange
• AM — Ante Meridian
• ADM — Add/Drop Multiplexer
• SAN — Storage Area Network
• CR — Carriage Return
• EFF — Electronic Frontier Foundation
• DDL — Data Definition Language
• CAE — Computer-Aided Engineering
• IPO — Initial Public Offering
• DMSP — Defense Meteorological Satellite Program (U.S.)

• EST — Eastern Standard Time
• SLA — Service Level Agreement
• CIO — Chief Information Officer
• UAV — Unmanned Aerial Vehicle
• PCB — printed circuit board
• DOA — dead on arrival
• DME — Distance Measuring Equipment
• AME — Amplitude Modulation Equivalent
• RFC — Request For Comment
• ADR — Address
• GPRS — General Packet Radio Service
• ARPA — Advanced Research Projects Agency (made early internet)
• SRAM — Static Random Access Memory (ess-ram)
• SCSI — Small Computer System Interface
• NIC — Network Interface Card
• ABR — Available Bit Rate
• EW — Electronic Warfare
• MTBF — Mean Time Before Failure
• CCIS — Common Channel Interoffice Signaling
• S X S — Step-by-Step
• EPA — Environmental Protection Agency (US)
• ASCII — American National Standard Code for Information Interchange
• EC — European Commission
• RNC — Radio Network Controller
• JV — Joint Venture
• FAA — Federal Aviation Administration
• URL — Universal Resource Locator
• VHF — Very High Frequency
• VVX — Voice and Video eXchange
• WWW — World Weather Watch
• AC — Access Control
• RDBMS — Relational Database Management System
• B-ICI — Broadband Inter-Carrier Interface
• FX — Foreign Exchange
• CIR — Committed Information Rate (Frame Relay)
• AOA — Angle Of Arrival
• SCC — Standards Council of Canada
• AM — Amplitude Modulation
• DB — Decibel
• 100BASE-T2 — 100 Megabits per Second, Baseband, Two-pair Category 3 UTP cables
• ASR — Airport Surveillance Radar
• CCTV — Closed-circuit television
• GUI — Graphical User Interface (goo-ey)
• TCB — Trusted Computing Base
• VR — Virtual Reality
• CPT — Carriage Paid To
• RAM — random-access memory
• A-KEY — Authentication key
• BECN — Backward Explicit Congestion Notification
• RAEX — Roaming Agreement EXchange

• TCP — Transmission Control Protocol
• AVHRR — Advanced Very High Resolution Radiometer  
• SD — Standard Deviation
• GPS — Global Positioning System (ex-NAVSTAR)
• XA-FR — Exchange Access Frame Relay
• UPS — Ultraviolet Photoelectron Spectroscopy
• WLTF — Wireless LAN (Local Area Network) Task Force
• EBCDIC — Extended Binary Coded Decimal Interchange Code (pronounced Eb-see-dik) (cf. BCD)
• ASK — amplitude shift keying
• ACL — Access Control List
• AD — Active Directory
• SXS — Step-By-Step
• S-BCCH — Short Message Service Broadcast Control Channel
• CU — Control Unit
• CPM — Critical Path Method
• SLF — Super Low Frequency
• SWAG — Scientific Wild Ass Guess
• DHCP — Dynamic Host Configuration Protocol
• RPC — Remote Procedure Call
• DES — Data Encryption Standard
• QI — Quality Improvement
• DMTS — Distinguished Member Of Technical Staff
• SME — Subject Matter Expert
• JAXA — Japan Aerospace Exploration Agency
• QMS — Quality Management System
• NPV — Net Present Value {economics}
• NATO — North Atlantic Treaty Organisation
• ATF — Advanced Tactical Fighter
• CIS — Commonwealth of Independent States
• WAFB — Wireless Absolute Fairness Bound
• NIH — Not Invented Here
• CB — Call Back
• DTE — Data Terminal Equipment
• MOB — Mobile
• SP — Service Provider
• SLIP — Serial Line Interface Protocol
• EU — European Union (1994; formerly referred to as the EEC or EC)
• NPI — New Product Introduction
• ICT — Information and Communication Technology
• RU — Are You?
• DTX — Discontinuous Transmission
• TTYL — Talk To You Later (Internet Slang)
• ERP — Enterprise Resource Management
• X-ON — Transmitter On
• CBC — cipher block chaining
• I/O — Input/Output
• QOS — Quality of Service
• DFS — Distributed File System
• APIC — Advanced Programmable Interrupt Controller
• X-OFF — Transmitter Off

• SQA — Software Quality Assurance
• IM — Instant Message
• TC — Telephone Call
• IRLAN — Infrared LAN
• EMG — Electromyogram
• SDR — Special Drawing Rights
• CDR — Call-Detail Record
• USB — Universal Serial Bus
• RACON — Radar Beacon
• GRE — Generic Routing Encapsulation
• ATS — applications technology satellite
• CMI — Computer Managed Instruction
• CFE — Contractor-Furnished Equipment
• CRL — Certificate Revocation List
• TAC — Technical Assistance Center
• TNSTAAFL — There's No Such Thing As A Free Lunch
• ATM — Adobe Type Manager
• MSN — Microsoft Network
• SAS — Statistical Analysis System
• YGWYPF — You Get What You Pay For
• WB — Welcome Back
• ABET — Accreditation Board for Engineering and Technology, Inc.
• LCP — Link Control Protocol
• RM — Resource Management
• H323 — ANSI standard for format over IP
• SIG — Special Interest Group
• MDA — Monochrome Display Adapter
• PVT — Private
• DMX — De-MultipleXer
• NMT — Nordic Mobile Telephone
• ADPE — Automatic Data Processing Equipment
• CRT — Cathode Ray Tube (type of TV)
• B3ZS — bipolar 3-zero substitution
• TBD — To Be Determined
• Q&A — Question & Answer
• CM — Configuration Management
• ACFQ — Absence Compensation Fair Queuing
• PAR — Precision Approach Radar
• ACK — Acknowledge (telecommunications; Cf. NAK)
• CIM — Corporate Information Management
• UHF — Ultra High Frequency (300-3000 MHz; 1m-10cm)
• PO — Purchase Order
• AP — Application Protocol
• PDN — Public Data Network
• PLMN — Public Land Mobile Network
• ACM — Association for Computing Machinery
• ISO — Infrared Space Observatory
• FFT — Fast Fourier Transform
• CAM — Computer-Aided Mapping
• BS — Base Station

• ACE — Advanced Computing Environment
• CC — Carbon Copy
• ISRO — Indian Space Research Organisation
• VIRUS — Vital Information Resources Under Siege
• MAC — Message Authentication Code
• WACN ID — Wide Area Communications Network IDentifier
• ATC — Air traffic control
• DNS — Domain Name System
• C-NBAP — Common Node B Application Part
• EDS — Electronic Data Systems Corporation
• SMS — Short Message Service
• BCC — Blind Carbon Copy
• MIC — Message Integrity Check
• IMPACT — Integrated Manufacturing Precision Assembly Cellular Technology
• AE — Application Entity
• OMG — Object Management Group
• M — Meter
• LEO — Low Earth Orbit (satellite communications)
• DIT — Directory Information Tree
• BBU — Baseband Unit
• AGP — Accelerated Graphics Port
• SGML — Standard Generalized Markup Language
• AAAI — American Association for Artificial Intelligence's
• PM — Preventive Maintenance
• DC — Direct Current
• PLD — Programmable Logic Device
• FCW — Federal Computer Week
• ZDBOP — Ziff-Davis Benchmark Operation
• DRAM — Dynamic Random Access Memory (dee-ram) (computing)
• D-NBAP — Dedicated Node B Application Part
• EAP — Extensible Authentication Protocol
• IVR — Interactive Voice Response (telephone technology)
• BPRZ — Bipolar Return-to-Zero
• PNG — Portable Network Graphics (graphic file standard/extension)
• DARPA — Defense Advanced Research Projects Agency (US)
• AE — Account Executive
• SDD — Software Design Document
• DSA — Directory System Agent
• EVP — Executive Vice President
• AGC — Automatic Gain Control
• VDS — Variable Depth Sonar
• DLR — Design Layout Record
• MIS — Management Information System (OSHA)
• PGP — Pretty Good Privacy (encryption)
• MOS — Model Output Statistics
• AF — Audio Frequency
• TPDU — Transport Protocol Data Unit
• CBT — Computer Based Training
• FDDI — Fiber Distributed Data Interface
• MS — Message Store

• NSF — National Sanitation Foundation
• NYSE — New York Stock Exchange
• OSS — Operational Support System
• TM — Technical Manual
• 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.
• EEC — European Economic Community (predecessor of the European Union|EU)
• DLC — Digital Loop Carrier
• CDS — Cell Directory Service
• UAX 14 — Unit Automatic eXchange type 14
• EGA — Enhanced Graphics Adapter
• P&L — Profit and Loss statement
• VTC — Video Teleconference
• UAS — Unavailable Seconds
• QA — Center for Quality Assurance in International Education
• DOD — United States Department of Defense
• TV — Television
• CAD — Computer Aided Designer
• FAQ — Frequently Asked Questions (sometimes Pronounced Fak)
• IETF — Internet Engineering Task Force
• RPM — Revolutions Per Minute, (Rotations Per Minute)
• ME — Mobile Equipment
• HDLC — High-Level Data Link Control
• ICMP — Internet Control Message Protocol
• HSDPA — High-Speed Downlink Packet Access
• AT — Access Tandem
• CU — See You
• JIS — Japanese Industrial Standard
• RFI — Request For Information. Sales department shorthand. Special priority when use in conjunction with RFN (see below).
• E-LEAD — Ear Lead
• COO — Chief Operation Officer
• OCR — Optical Character Recognition
• MS — Mobile Station
• IS — Intermediate System
• DOJ — Department of Justice (US)
• OSI — Open Systems Interconnection (iso Standard)
• RCU — Remote Control Unit
• TS — Technical Specification
• LLC — Logical Link Control
• ADF — Automatic Direction Finder
• CIM — Common Information Model
• AT — Advanced Technology
• ENIAC — Electronic Numerical Integrator And Computer
• SEI — Software Engineering Institute
• OSPF — Open Shortest Path First (ATM)
• AFC — Automatic Frequency Control
• CERT — Computer Emergency Response Team
• CAM — computer aided manufacturing
• RFI — Radio Frequency Interference
• AML — Amplitude Modulated Link
• TOS — Type Of Service

• CC — Call Control
• PAL — Programmable Array Logic
• MF — Medium Frequency
• QAM — quadrature amplitude modulation
• CW — Continuous Wave
• PECVD — Plasma-Enhanced Chemical Vapor Deposition
• BBS — Bulletin Board System
• IW — Information Warfare
• FC — Fibre Channel
• OBO — Or Best Offer
• RIP — Routing Information Protocol
• CIC — Circuit Identification Code
• ARP — Address Resolution Protocol (ATM)
• CLNP — ConnectionLess-mode Network Protocol
• RCC — Rescue Coordination Center
• LF — Low Frequency
• MTTR — Mean Time To Repair
• VPN — Virtual Private Network (ATM)
• PDU — Protocol data unit (such as segment, packet, frame, etc.)
• DQE — Detective Quantum Efficiency
• YP — Yellow Pages
• NEC — National Electrical Code
• DT — DWDM (Dense Wavelength Division Multiplexing) Terminal
• BST — British Summer Time
• COO — Cost of Ownership
• ZIP — Zone Improvement Plan
• MPI — Message Passing Interface
• DSS — Decision Support System
• CBDS — Connectionless Broadband Data Service
• BT — British Telecommunications
• Z — Zero
• ADT — Abstract Data Type
• MHS — Message Handling System (electronic)
• BCD — Binary-Coded Decimal
• ISDN — Integrated Services Digital Network
• COMJAM — Communications Jamming
• VM — Virtual Machine
• CS — Cable Select
• MHS — Microwave Humidity Sounder
• NSA — National Security Agency
• EEPROM — Electrically Erasable Programmable Read-Only Memory
• NAS — Network Access Server
• HW — Hardware
• CUL — See You Later
• IDT — Integrated Digital Terminal
• ISS — International Space Station
• SEM — Space Environment Monitor
• SOW — Statement Of Work
• CHAP — Challenge Handshake Authentication Protocol (ATM)
• DPC — Destination Point Code

• RAD — Rapid Application Development
• WMAN — Wireless Metropolitan Area Network
• PE — Polyethylene
• ECN — Explicit Congestion Notification
• POP — Point Of Presence (Internet)
• ERT — Emergency Response Team
• TBD — To Be Decided
• TLS — Transport Layer Security
• LCN — Logical Channel Number
• I.LINK — IEEE 1394, High Performance Serial Bus, implementation
• DCE — Distributed Computing Environment
• DQPSK — Differential Quadrature Phase-Shift Keying
• AFSK — Audio Frequency Shift Keying
• VB — Visual Basic
• AR — Access Rate
• CEV — Controlled Environment Vault
• FA — Functional Area
• LSR — Local Service Request
• JIT — Just in time
• WS — Workstation
• ROI — Return on Investment
• MS — Management System
• O&M — Operation and Maintenance
• STI — Speech Transmission Index
• JSC — Johnson Space Center (Houston, TX)
• SSM — Source-Specific Multicast
• NI — Network Interface
• ECO — Engineering Change Order
• UR — Your
• OTN — Optical Transport Network
• AMT — Amount
• MVS — Multiple Virtual Storage
• DMA — direct memory access (computer term)
• RDP — Radar Data Processing
• SIL — Speech Interference Level
• RFS — Request For Service
• DOM — Document Object Model
• CABS — Carrier Access Billing System
• AMD — Advanced Micro Devices, Inc. (producer of computer chips)
• AS — Autonomous System
• PSTN — Public Switched Telephone Network
• VOP — Voice Over Packet
• AAAS — American Association for the Advancement of Science
• BRA — Basic Rate Access
• DDE — Dynamic Data Exchange (in software parlance)
• CRM — Customer Relationship Management
• RM — Regional Manager
• UAN — Universal Access Number
• URI — Uniform Resource Identifier
• ARPU — Average Revenue Per User

• RAID — Redundant Array of Inexpensive Disks
• DTR — Data Terminal Ready
• MS — Millisecond
• ISI — Inter-Symbol Interference
• F — Fellow
• PT — Project Team
• CAA — Civil Aviation Authority
• PWD — Password
• NESDIS — National Environmental Satellite, Data, and Information Service
• HF — High Frequency
• IPX — Internetwork Packet Exchange
• SA — Scientific American
• EDVAC — Electronic Discrete Variable Automatic Computer
• FXO — Foreign Exchange Office
• PMA — Physical Medium Attachment
• PRF — Pulse Repetition Frequency
• E — Energy
• COM — Component Object Model
• FCA — Free Carrier
• OM — Old Man
• GB — Gigabyte
• SQL — Structured Query Language
• ATSR — Along-Track Scanning Radiometer
• COQ — Cost Of Quality
• APC — American Power Conversion
• PRI — Primary Rate Interface (ISDN)
• BR — Branch
• CO — Certificate of Origin
• M-CSI — Mobility management CAMEL (Customized Applications for Mobile network Enhanced Logic) Subscription Information
• BER — Bit-Error Rate
• DIS — Distributed Interactive Simulation
• DAHDI — Digium/Asterisk Hardware Device Interface
• AMI — Alternate Mark Inversion
• DOS — Disk Operating System
• ERP — Enterprise Resource Planning
• NOTAM — Notice to Airmen
• MC — Message Center
• DSSS — Direct Sequence Spread Spectrum
• BPR — Business Process Re-engineering
• DNIS — Dialed Number Identification Service
• MLS — Multiple Listing Service
• NA — Not Applicable
• CATV — Community Antenna Television
• VAC — Vacant
• PC — Personal computer (host)
• VOD — Video On Demand
• RTS — Request To Send
• CLI — Command line Interface (Cabletron)
• SAIC — Science Applications International Corporation
• DSL — Digital Subscriber Line

• CGI — Computer-Generated Imagery
• OMS — Optical Multiplex Section
• FIPS — Federal Information Processing Standard
• SEC — Software Engineering Center
• W3C — World Wide Web Consortium
• IP — Intelligent Peripheral
• AMI — Advanced Metering Infrastructure
• IS — International Standard
• AADC — Automated Area Distribution Center
• EAS — Extended Area Service
• SVC — Scalable Video Coding
• ACR — Attenuation Crosstalk Ratio
• JPL — Jet Propulsion Laboratory (California Institute of Technology) (NASA)
• AXE 10 — Series of electronic telephone exchanges from L.M. Ericsson
• TEC — Total Electron Content
• NTFS — New Technology File System
• NLMS — Normalized Least Mean Square
• AU — Audio Unit
• ARPANET — ARPA Network
• CIA — Central Intelligence Agency
• CAC — Carrier Access Code
• DMARC — Demarcation point
• ECT — Explicit Call Transfer
• MSR — Microwave Scanning Radiometer
• PCI — Peripheral Component Interconnect
• ITSEC — Information Technology Security Evaluation Criteria
• CDMA — Code Division Multiple Access (voice/data transmission)
• TCP/IP — transmission control protocol/internet protocol
• SOHO — Small Office Home Office
• LED — law enforcement desk; light emitting diode
• T-CARRIER — Trunk Carrier
• UA — User Agent
• ASR — Access Service Request
• IRS — U.S. Internal Revenue Service
• ITU — International Telecommunication Union
• IN — Intelligent Network
• SM — Senior Member
• DSTE — Digital Subscriber Terminal Equipment
• SCTP — Stream Control Transmission Protocol
• MSU — Microwave Sounding Unit
• UL — Uplink
• MSE — Mobile Subscriber Equipment
• IEC — International Electrotechnical Commission
• HZ — cycles per second (hertz)
• DLL — Dynamic Link Library (computer file)
• CT — Computer Telephony
• AQL — Acceptable Quality Level
• RACF — Resource Access Control Facility
• TB — Terabyte
• NIST — National Institute of Standards and Technology

• ZIP — Zone Information Protocol
• RT — Remote Terminal
• PERT — Program Evaluation and Review Technique
• NIC — Network Information Center
• BIS — Bureau of Indian Standards
• LP — Low Pressure
• AEC — Architecture, Engineering, Construction
• NIS — Network Information Service
• ES — Errored Second
• DA — Destination Address
• BACP — Bandwidth Allocation Control Protocol
• FR — Frame Relay
• RFO — Reason For Outage
• EPR — Electron Paramagnetic Resonance
• DASD — Direct Access Storage Device
• LF — Line Feed
• SPI — Service Provider Interface
• MD — Mediation Device
• SCP — Service Control Point
• AFP — AppleTalk Filing Protocol
• DIBL — Drain-induced Barrier Lowering
• ARA — Apple Remote Access
• ISA — Industry Standard Architecture
• 3G — Third Generation mobile phone network
• GSA — U.S. General Services Administration
• PDS — Protected Distribution System
• SNR — Signal-to-Noise Ratio
• ELINT — Electronic Intelligence Satellite
• MP — Multilink Protocol
• DS — Digital Signal
• RCV — Receive
• KISS — Keep It Simple Stupid
• TOP — Technical Office Protocol
• PPB — parts per billion (109)
• CAB — Conformity Assessment Body
• WG — Working Group
• CAN — Campus Area Network
• CDT — Central Daylight Time
• PIN — Personal Identification Number
• MCU — Multipoint Control Unit
• VAZO — Violating All-Zero Octet
• WB — Write Back
• NMR — Nuclear Magnetic Resonance
• CA — Certificate Authority
• LPC — Linear Predictive Coding
• NOAA — National Oceanic and Atmospheric Administration (US)
• DAP — Directory Access Protocol
• STP — Spanning Tree Protocol
• AFS — Andrew File System
• TRM — Technical Reference Model

• ADC — Analog-Digital Converter
• NLM — National Library of Medicine (National Institutes of Health)
• ASQC — American Society for Quality Control's
• MRC — Monthly Recurring Charge
• VOL — Volume
• NTIA — National Telecommunications and Information Administration
• RH — Relative Humidity
• PAN — Personal Area Network
• IIS — Internet Information Services
• USD — United States Dollar
• STM — Short Term Memory
• TWT — Traveling Wave Tube
• EPABX — Electronic Private Automatic Branch Exchange
• PGA — Programmable Gate Array
• AT&T — American Telephone & Telegraph
• RA — Risk Analysis
• MDA — Model Driven Architecture
• SBC — Southwestern Bell Corporation
• DCP — Design Change Package
• LPE — Liquid Phase Epitaxy
• WYSIWYG — What You See Is What You Get (pronounced Wizzy-wig. See Entry For Derived Acronyms)
• WPS — Wireless Priority Service
• TN — Telephone Number
• EEG — Electro-EncephaloGram
• SNMP — Simple Network Management Protocol (ATM)
• FCS — Frame check sequence (Ethernet)
• TG — Task Group
• SPC — Stored Program Control
• DVP — Digital Voice Privacy
• AMLCD — Active Matrix Liquid Crystal Display
• BT — BlueTooth
• DCS — Digital Cross-connect System
• CAV — Constant Angular Velocity
• P — Predicted
• AIS — Alarm Indication Signal
• STK — Satellite Tool Kit
• ASP — Application Service Provider
• BYOD — Bring Your Own Device
• CMM — Capability Maturity Model
• ADN — Advanced Digital Network
• FCP — Fibre Channel Protocol
• T-IC — T-interConnect
• ATN — Aeronautical Telecommunication Network
• LD — Long Distance
• LZ — Landing Zone
• NMS — Network Management System
• BNSC — British National Space Centre
• KBYTE — Kilobyte (103)
• OS — Operating System
• MAC — Media Access Control

• ROFL — Rolling on the floor laughing
• GOS — Grade Of Service
• ADEOS — ADvanced Earth Observing Satellite (Japan)
• SIC — Standard Industrial Classification (Code)
• AEW — Airborne Early Warning
• PUB — Publication (file name extension)
• CF — Compact Flash
• 1000BASE-T — 1000 Megabits per Second, Baseband, Twisted Pair
• FE — Far End
• VLF — Very Low Frequency
• NCS — National Communications System
• M — Management
• DUP — Duplicate
• TE — Traffic Engineering
• SPADATS — Space Detection And Tracking System
• CG — Coast Guard
• OAS — Organization of American States
• SABGW — System Architecture Evolution Gateway
• EOT — End Of Transmission
• VLL — Virtual Leased Line
• SVD — Singular Value Decomposition
• CMS — Content Management System
• AT&T — American Telephone and Telegraph (U.S. company, also known as "Ma Bell")
• ASI — Asynchronous Serial Interface
• GDS — Global Distribution System
• BSOD — Blue Screen Of Death
• CTS — Clear To Send
• TNX — Thanks
• OPC — Originating Point Code
• SVC — Switched Virtual Connection
• HTTPS — HyperText Transfer Protocol Secure
• CATV — Cable Television
• BIP — Band Interleaved by Pixel
• MCSD — Microsoft Certified Solution Developer
• FUP — Fair Use Policy
• BPS — bits per second
• SAN — System Area Network
• BS — Beam Splitter
• DDS — Digital Data Service
• BOC — Bell Operating Company
• SSL — Secure Socket Layer
• MTSO — Mobile Telephone Switching Office
• CSAT — Customer Satisfaction
• BGP — Border Gateway Protocol (routing protocol)
• DCOM — Distributed Component Object Model
• HVAC — Heating, Ventilation, and Air Conditioning
• PD — Public Domain
• PABX — private automatic branch exchange (telephone)
• VC-ATOD — Virtual Clearinghouse on Alcohol, Tobacco and Other Drugs
• ASR — Automatic Speech Recognition

• RTN — Regional Telecommunication Network
• DID — direct inward dial
• FITS — Flexible Image Transport System
• DAL — Dedicated Access Line
• PSD — Phase-Sensitive Detector
• AOI — Area Of Interest
• DBS — Direct Broadcast Satellite
• ESS — Electronic Switching System
• DTI — Department of Trade and Industry (UK)
• UTC — Coordinated Universal Time
• MOL — Manned Orbiting Laboratory
• Y — Yttrium
• OC — Optical Carrier
• ARC — Army Reuse Center
• ELF — Extremely Low Frequency
• EAC — Engineering Accreditation Commission
• PBX — Private Branch eXchange (company phone system)
• OLAP — Online Analytical Processing
• MDF — Main Distribution Frame
• BG — Background
• EMC — Electromagnetic Compatibility
• CTD — Cumulative Trauma Disorder
• FCC — Federal Communications Commission (US)
• STP — Signal Transfer Point
• CST — Central Standard Time (UTC-6 Hours)
• SBC — Session Border Controller
• KHZ — kilohertz (1000 cycles per second)
• FCA — Free Carrier Absorption
• RSVD — Reserved
• SHF — Super High Frequency
• IS — Information System
• TCSEC — Trusted Computer System Evaluation Criteria
• DID — Digital Information Display
• CRC — Contrôle de Redondance Cyclique (French: Cyclic Redundancy Check)
• CFO — Communication Filing Officer
• CIS — CompuServe Information Service
• FTTB — Fiber To The Building
• BRI — Basic Rate Interface
• CNM — Customer Network Management
• PPP — Point-to-Point Protocol
• SAE — Society of Automotive Engineers
• ASIC — application-specific integration circuit
• AM — Activity Manager
• EDP — Electronic Data Processing Plc (London Stock Exchange [LSE])
• NEMA — National Electric Manufacturer's Association
• NTIS — National Technical Information Service Technology Administration
• SOAP — Simple Object Access Protocol
• EDD — Envelope Delay Distortion
• AAS — Adaptive Antenna System
• SCN — Switched Circuit Network

• EFS — Encrypting File System
• ROSAT — Roentgen Satellite
• AMHS — Automated Message Handling System
• RFD — Request For Discussion
• ECP — Encryption Control Protocol
• C4 — Command, Control, Communications, and Computers
• CU — Channel Unit
• TCO — Total Cost of Ownership
• ECAC — European Civil Aviation Conference
• BERT — Bit Error Rate Tester (telecommunication)
• MCA — Micro Channel Architecture
• ADCCP — Advanced Data Communications Control Procedures
• LEN — Line Equipment Number
• HDML — Handheld Device Markup Language
• DCN — Design Change Notification
• ATA — Analog Telephone Adapter
• TO — Technical Order
• RT — Radiotelephone
• ETS — European Telecommunication Standard
• RSRQ — Reference Signal Received Quality
• NRC — National Research Council (Canada)
• LEP — Large Electron Positron
• AIN — Advanced Intelligent Network
• METRO — Metropolitan
• VC — Virtual Channel
• DC — Disconnected
• Y — Yes
• PDS — Planetary Data System
• DEC — Decimal
• MOD — Modify
• MIPS — Millions of Instructions Per Second
• C³CM — Command, Control and Communications Countermeasures
• DX — Duplex
• MCD — Magnetic Circular Dichroism
• TLC — The Learning Channel
• AVL — Available
• DC — Display Controller
• MME — Mobility Management Entity
• DCS — Digital Cross-Connect
• NNM — Network Node Manager
• EIP — Equipment installation procedure
• 10BASE-T — 10 Megabits per second, Baseband, Twisted pair
• CB — Common Battery
• TSR — Telecommunications Service Request
• EPR — Ethylene-Propylene Rubber
• WWAN — Wireless Wide Area Network
• CBP — Coded Block Pattern
• SF — Single Frequency
• ASARS — Advanced Synthetic Aperture Radar System
• ISBN — International Standard Book Number (ISO 2108)

• OLE — Object Linking and Embedding (Microsoft communication protocol)
• YL — Young Lady
• ISSN — International Standard Serial Number (ISO 3297)
• TE — Test Equipment
• 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
• SL — Single Line
• FAA — Federal Aviation Agency
• CMT — Cadmium Mercury Telluride
• RT — Response Time
• DCN — Disconnect
• DSP — Digital Signal Processor
• CER — Cell Error Ratio
• OSHA — Occupational Safety and Health Act (1970)
• FASB — Financial Accounting Standards Board
• EMR — Electromagnetic Radiation
• VT — Vacuum Tube
• RARP — Reverse Address Resolution Protocol
• FDL — Facility Data Link
• OSTP — Office of Science and Technology Policy
• JVM — Java Virtual Machine
• PVC — Permanent Virtual Circuit (ATM)
• NBS — National Bureau of Standards (US)
• SVP — Senior Vice President
• OTS — Optical Transmission Section
• DUC — Digital Up-Converter
• SLP — Service Location Protocol
• ADT — Atlantic Daylight Time (UTC-3 Hours)
• SHA — Secure Hash Algorithm
• BPDU — Bridge Protocol Data Unit
• AS — Access System
• FTTH — Fiber To The Home
• APM — Advanced Power Management
• DSN — Deep Space Network - network of large antennas and communication facilities.
• CS — Convergence Sublayer (ATM)
• CCTA — Central Computer and Telecommunications Agency
• EX — Exercise
• AAF — Advanced Authoring Format
• SIT — Static Induction Transistor
• BTC — Botswana Telecommunications Corporation
• ESTEC — European Space Research and Technology Centre
• PE — Probable Error
• SML/SMS — Service Management Layer/Service Management Service
• PDC — Personal Digital Cellular
• ARG — Argument
• PTA — Pakistan Telecommunication Authority
• OC-9 — Optical Carrier Signal, Level 9
• UN — United Narions
• FR PVC — Frame Relay Permanent Virtual Connection
• PS — Product Specification
• QPSK — aeronautical quadrature phase shift keying

• A — Anode
• NNTP — Network News Transfer Protocol
• FE — Finite Element
• MTU — Maximum Transmission Unit
• SAR — Specific Absorption Rate
• ANI — Automatic Number Identification (Caller ID)
• UI — User Interface
• DL — Digital Library
• IANA — Internet Assigned Numbers Authority
• ECMA — European Computer Manufacturer's Association
• OAM&P — Operations, Administration, Maintenance & Provisioning
• TI — Time Interval
• ISAS — Institute of Space and Astronautical Sciences (Japan)
• LLU — Local Loop Unbundling
• DSLAM — Digital Subscriber Line Access Multiplexer (Module)
• MIB — Management Information Base (ATM)
• CFA — Carrier Facility Assignment
• VOIP — Voice Over IP (Internet Protocol)
• LU — Logical Unit
• LDAP — Lightweight Directory Access Protocol (pronounced Ell-dap)
• BS — Broadcast Satellite
• SAS — Special Access Surcharge
• TCM — Trellis-Coded Modulation
• CGM — Computer Graphics Metafile
• MMU — Memory Management Unit
• AUD — Audit
• B2C — Business-to-Consumer
• CO — Central Office
• APS — Automatic Protection Switching (SONET/SDH)
• LQR — Linear Quadratic Regulator
• IT — Integration Test
• RJ-25 — Registered Jack type 25 (6-wire connector)
• BSS — Basic Service Set
• PM — Project Manager
• BIOS — Basic Input Output System
• OC-18 — Optical Carrier Signal, Level 18
• CAM — Content Addressable Memory
• NIC — Network Interface Controller
• SCM — Supply Chain Management
• IP — Intellectual Property
• PIC — Peripheral Interface Controller
• SRS — Software Requirements Specifications
• IV — Initialization Vector
• TE — Terminal Equipment
• ACT — Activity
• RSN — Real Soon Now [which may be a long time coming]
• CDC — Connected Device Configuration
• CIFS — Common Internet File System
• E — Echo
• ADL — Advanced Distributed Learning

• ARINC — Aeronautical Radio Incorporated
• OC-256 — Optical Carrier Signal, Level 256
• RTU — Remote Terminal Unit
• DCS — Digital Cellular System
• DRM — Digital Rights Management
• EEA — European Economic Area
• CORBA — Common Object Request Broker Architecture
• SD — Software Development
• UP — User Profile
• SBU — Strategic Business Units
• CAPS — Call Attempts Per Second
• ECPA — Electronic Communications Privacy Act 1986
• FAX — Facsimile
• ARIN — American Registry for Internet Numbers
• AWG — American Wire Gauge
• PCM — Pulse-Code Modulation
• 9 — Nine
• ITP — Interactive Telecommunications Program
• PM — post meridian
• Q — Quadrature
• PKI — Public Key Infrastructure (cryptography)
• PAP — Password Authentication Protocol (ATM)
• YYP — Yahoo Yellow Pages
• SATAN — Security Administrator Tool for Analyzing Networks
• NIST — National Institute of Standards & Technology (US)
• BIU — Bus Interface Unit
• RDF — Radio Direction Finder
• ACTV — Active
• LT — Less Than
• JAN — Joint Army-Navy
• JPEG — Joint Photographic Experts Group (24-bit image storage format)
• STA — State
• HSS — Home Subscriber Server
• SIM — Subscriber Identity Module
• DID — data item description
• CMP — Connection Management Protocol
• NOC — Network Operations Center
• PST — Pacific Standard Time (UTC-8 Hours)
• SML — Service Management Layer
• APPL — Application
• BSS — Base Station Subsystem
• ACF — Access Control Field
• MAI — Multiple Access Interference
• AYT — Are You There
• BOD — Bandwidth on Demand
• CCSD — command communications service designator; control communications service designator
• SCADA — Supervisory Control And Data Aquisition
• VT — Virtual Terminal
• EFT — Electronic Funds Transfer
• AFM — Atomic Force Microscopy

• CMD — Command
• DTMF — Dual-Tone MultiFrequency
• D-RAM — Dynamic Random Access Memory
• TOS — Temporarily Out of Service
• NA — Network Adapter
• NPA — Numbering Plan Area
• ROS — Return on Sales
• PMP — Project Management Professional
• EAI — Enterprise Application Integration
• PVD — Physical Vapor Deposition
• BAN — Base Area Network
• B3G — Beyond Third Generation
• TCR — Temperature Coefficient of Resistance
• EFIS — Electronic Flight Information System
• MX — Mixer
• VOA — Voice Of America
• SPM — Scanning Probe Microscope
• B2B — Business to Businesse
• PG — Page
• SZ — Seizure
• TSB — Telecommunication Standardization Bureau
• SPGA — Staggered Pin Grid Array
• WLAN — Wireless Local Area Network
• DDL — Digital Data Link
• SA — Source Address
• DPL — Digital Power Line
• MV — Motion Vector
• FRS — Family Radio Service
• EDT — Eastern Daylight Time
• FEP — Front End Processor
• FRS — Frame Relay Service
• MIDP — Mobile Information Device Profile
• BUS — Business
• EMEA — Europe, Middle East and Africa
• FSK — Frequency-Shift Keying
• PC — Peripheral Controller
• ATC — Advanced Technology Center
• CDA — Command and Data Acquisition
• ACLR — Adjacent Channel Leakage Ratio
• CB — Citizens' Band
• WTLS — Wireless Transport Layer Security
• CGA — Carrier Group Alarm
• SB — Switchboard
• HTML — Hyper Text Markup Language
• ISM — Industrial, Scientific and Medical
• TAG — Technical Advisory Group for Biological Control Agents of Weeds
• NCSC — National Computer Security Center (NSA)
• ACE — Adaptive Communication Environment
• ABN — Abnormal
• TMS — Time Management System

• BBM — Blackberry Messenger
• 911 — Emergency Services Phone Number
• SOGA — Share of Gross Adds
• MIT — Massachusetts Institute of Technology (U.S.)
• CPC — Continous Packet Compression
• C — Cost
• EECM — End-to-End Call Manager
• NES — Network Encryption System
• PDT — Portable Data Terminal
• EISA — Extended Industry Standard Architecture
• BCH — Binary Coded Hexadecimal
• EMS — Express Mail Service
• WIPO — World Intellectual Property Organization
• CS-PDU — Convergence Sublayer - Protocol Data Unit
• ARQ — Automatic Repeat-reQuest
• TLK — Talk
• CD — Critical Dimension
• KB — Kilobyte: One thousand and twenty-four bytes kbps kilo bit per second
• 2W — 2-Wire
• TTY — Teletype Telex Machine
• CTU — Central Terminal Unit
• ROTFL — Roll On The Floor Laughing
• TDOA — Time Difference Of Arrival
• 100BASE-T4 — 100 Megabits per Second, Baseband, Four-pair Category 3 UTP cables
• POTS — Plain Old Telephone Service (FCW)
• SUS — Suspension
• CBWFQ — Class Based Weighted Fair Queueing
• USGS — United States Geological Survey (DOI)
• SMR — Specialized Mobile Radio
• SDLC — Synchronous Data Link Control
• SW — South West
• CG — Center of Gravity (DXS)
• RP — Reference Point
• SRM — Scalable Reliable Multicast
• BS — Backing Store
• MIME — Multipurpose Internet Mail Extension
• VGA — Video Graphics Array
• CRO — Central Records Office
• SLV — Satellite-Launch Vehicle
• CAP — Capability
• RSVP — Resource Reservation Protocol (Internet)
• IRS — Interface Requirements Specification
• AIT — Automatic Identification Technology
• E&M — ear and mouth (special signaling leads)
• WPM — speech--words per minute
• OSCAR — Orbiting Satellite Carrying Amateur Radio
• TOA — Time Of Arrival
• ELT — Emergency Locator Transmitter
• 2W — Two Wire
• SPX — Sequenced Packet Exchange

• EM — Electromigration
• RMS — root mean square (preferred over "RMS")
• RAN — Radio Access Network
• NTP — Network Time Protocol
• LMS — Learning management system
• SG — Signaling Gateway (IETF)
• TAD — Telephone Answering Device
• ECP — Engineering Change Proposals
• T&C — Terms & Conditions
• CGSA — Cellular Geographic Service Area
• FAS — Frame Alignment Signal
• ECE — Economische Commissie voor Europa (United Nations) (Dutch: Economic Commission for Europe)
• ESF — Edge Spread Function
• SIL — Silence
• CAD — Computer-Aided Design
• PM — Phase Modulation
• EHF — Extremely High Frequency
• COPS — Common Open Policy Service
• RSS — Really Simple Syndication
• CHF — Swiss Franc
• WPAN — Wireless Personal Area Network
• ECM — Electronic Counter Measures
• CQA — Certified Quality Auditor
• VG — Voice Grade
• CRIS — Carrier Route Information System
• SPA — Software Publishers Association
• DS-0 — Digital Signal, Level 0
• CSO — Customer Service Operations
• TDM — Time Division Multiplexer
• OFC — Office
• PSS — Performance Support System
• COM — Comedy Central
• PU — Physical Unit (IBM)
• B6ZS — Bipolar 6 Zero Substitution
• ODBC — Open Database Connectivity
• PPARC — Particle Physics and Astronomy Research Council
• DL — Data Link
• AIFF — Audio Interchange File Format
• 100BASE-T — 100 Megabits per second, Baseband, Twisted pair
• S/D — Source/Drain
• CSPRM — Common Signaling Protocols Resource Module
• ASDE — Airport Surface Detection Equipment
• FEP — Front-End Processor
• CCD — Charge Coupled Device - a device for the movement of electrical charge.
• ESP — Encapsulating Security Payload
• ER — Extended Range
• IRS — Inertial Reference System
• PDN — Packet Data Network
• ES — Emergency Service
• WMO — World Meteorological Organization (ICSU)

• ICANN — Internet Corporation for Assigned Names and Numbers
• LD — Laser Diode
• CFD — computational fluid dynamics
• AC — Area Code
• CES — Consumer Electronics Show
• MDM — Mobile Device Management
• KAK — Key-Auto-Key
• DMI — Distributed Management Interface
• O/S — Operating System
• FEC — Forward Error Correction
• HEHO — Head End Hop Off
• WE — Western Electric
• UPS — Uninterruptible Power Supply
• SQ — Service Quality
• VSAT — Very Small Aperture Terminal (satellite service)
• SN — Stock Number
• BA — Behaviour Aggregate
• ETF — Early Termination Fee
• DAP — Distributed Array Processor
• DNIC — Data Network Identification Code
• TTY — Text Teletype
• SDK — Software Development Kit (Microsoft)
• FAT — File Allocation Table
• SD — Speed Dial
• NAFTA — North American Free Trade Agreement
• SDH — Synchronous Digital Hierarchy (ATM)
• ECR — Electronic Cash Register
• PIM — Personal Information Manager
• FLM — First Line Maintenance
• TAM — Telephone Answering Machine
• TSE — Toronto Stock Exchange
• WAP — Wireless Application Protocol
• KM — Knowledge Management
• CSC — Common Signaling Channel
• SLIC — Subscriber Line Interface Circuit
• GMRS — General Mobile Radio Service
• 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)
• NSS — Network Switching Subsystem
• IPS — InPlane Switching
• DPL — Digital Private-Line
• CSPDN — Circuit Switched Public Data Network
• EGP — Exterior Gateway Protocol
• DII — Dynamic Invocation Interface
• JST — Japan Standard Time
• CBR — Constant Bit Rate
• BJT — Bipolar Junction Transistor
• ACPI — Advanced Configuration and Power Interface
• MH — Message Handler
• ISOC — Internet Society
• HDSL — High-bit-rate Digital Subscriber Line

• SPIN — Service Provider Identification Number
• FWA — Fixed Wireless Access
• CFD — Call For Discussion
• SPC — Statistical Process Control. Forerunning quality theory from the 1960s to TQC and TQM.
• ASQ — Alpha System Qualification
• DPDU — Data Protocol Data Unit
• IEC — Interexchange Carrier
• PVC — Permanent Virtual Connection
• WDN — Wireless Developer Network
• WTO — World Trade Organisation
• MGMT — Management
• SN — Service Number
• CPN — Cisco Powered Network
• MLP — Mobile Location Protocol
• TOVS — TIROS Operational Vertical Sounder
• IOC — Inter-Office Channel
• AN — Access Node
• SSRC — Synchronization Source
• P — Priority
• E — Electra
• EIGRP — Enhanced Interior Gateway Routing Protocol
• IMP — Interface Message Processor
• AP — Action Point
• STD — Subscriber Trunk Dialing
• WHT — Walsh-Hadamard Transform
• BIS — Business Information System
• CIP — Carrier Identification Parameter
• CS — Central Station
• SIA — Securities Industry Association
• ADC — Administration Center
• RMI — Remote Method Invocation
• BOFH — Bastard Operator From Hell
• DER — Distinguished Encoding Rules
• DDN — U.S. Defense Data Network
• EC — European Community
• MBPS — Megabits per second
• CI — Common Interface
• EMCON — Electromagnetic Emission Control
• CP — Call Processing
• XPS — X-Ray Photoelectron Spectroscopy
• CT — Computer Terminal
• FXS — Foreign Exchange Subscriber
• EU — End User
• SDU — Signal Distribution Unit
• DAT — Digital Audio Tape
• ORB — Object Request Broker
• COMDEX — Computer Dealers Exposition
• PROM — Programmable Read-Only Memory
• FITL — Fiber-In-The-Loop
• FOSE — Federal Office Systems Exposition

• CVR — Crystal Video Receiver
• ACP — Access Control Point
• FDTD — Finite Difference Time Domain
• TELECOMMUTE — Telecommuting
• GHZ — Gigahertz
• CIS — Computer and Information Science
• QDR — Quad Data Rate
• JCL — Job Control Language
• WINS — Windows Internet Name Service
• RTC — Real-Time Control
• PCI — Personal Computer Interface
• TAX — Trunk Automatic Exchange
• CGA — Color Graphics Adapter
• IMC — Intermediate Metal Conduit
• DTD — Document Type Definition (XML)
• PCMCIA — Personal Computer Memory Card International Association
• DCE — Data Communication Equipment
• RDS — Rate Determining Step
• AWACS — Airborne Warning And Control System
• AFOSR — Air Force Office Of Scientific Research(USA)
• OSP — Outside Plant
• VMS — Virtual Memory System
• CAM — Common Access Method
• B-ISDN — Broadband Integrated Services Digital Network
• CE — Channel Element
• DM — Domain Model
• BMEWS — Ballistic Missile Early Warning System (bee-mews)
• SCU — System Control Unit
• OTDOA — Observed Time Difference of Arrival
• IMSI — International Mobile Subscriber Identity
• IRC — International Record Carrier
• VOC — Volatile Organic Compounds (air pollution)
• SM — Service Module
• ADN — Abbreviated Dialing Number
• TUR — Trunk Utilization Report
• MA — Maintenance Action
• BSS — Base Station System
• CPS — characters per second
• IMEI — International Mobile Equipment Identity
• ACAP — Application Configuration Access Protocol
• IEEE — Institute of Electrical and Electronics Engineers
• LEC — Local Exchange Carrier
• MPEG — Motion Picture Experts Group
• DDD — Direct Distance Dialing
• FEXT — Far-End Cross Talk
• BSA — Business Software Alliance
• JTF — Joint Task Force
• HFC — Hybrid Fiber/Coaxial network
• ADF — automatic document feeder
• AIF — Audio Interchange Format

• C — Collector
• IAT — Integrated Access Terminal
• LASA — Large Aperture Seismic Array
• ALT — Accelerated Life Test
• JRE — Java Runtime Environment
• DNS — Domain Name Service
• BMS — Business Management System
• LATA — Local Access and Transport Area
• TKIP — Temporal Key Integrity Protocol
• MTS — Message Transfer System
• T — Temperature
• ASA — Acoustical Society of America
• LNP — Local Number Portability
• OTA — Office of Technology Assessment (U.S.; abolished by Congress, Fall 1995)
• SWAP — Shared Wireless Access Protocol
• EIA — Extended Interaction Amplifier
• AWT — Agence Wallonne des Télécommunications
• SAR — synthetic aperture radar (satellite)
• SSM — Synchronization Status Message
• DMS — Data Management System
• 3GPP — Third Generation Partnership Project
• DC — Device Control
• DII — Defense Information Infrastructure
• FH — Frequency Hopping
• DGPT — Directorate General of Posts and Telecommunications
• ISAKMP — Internet Security Association and Key Management Protocol
• AP — access point
• TRS — Telecommunications Relay Service
• WAIS — Wide Area Information Server
• DN — Distinguished Name
• DHD — Dial Home Device
• HEX — Hexadecimal (base 16)
• CP — Change Proposal
• V — Variable
• DTN — Data Transfer Network
• SRR — Search and Rescue Region
• FTTC — Fiber To The Curb光纤到路边
• TSO — Telecommunications Service Order
• CDE — Common Desktop Environment
• COO — Cell of Origin
• CFV — Call For Vote(s)
• ASD — Alternative Service Delivery
• MBWA — Mobile Broadband Wireless Access
• DVB — Digital Video Broadcasting
• WAYP — White and Yellow Pages
• OSS — Operations Support System
• GDM — GSM (Global System for Mobile communications) Data Module
• RDI — Remote Defect Indicator (UNI Fault Management)
• ASEAN — Association of South East Asian Nations
• LISP — List Processing Language

• TDMA — Time Division Multiple Access
• KDC — Kerberos Key Distribution Center
• RADIUS — Remote Authentication Dial-In User Service
• VPI — Virtual Path Identifier
• IRDA — Infrared Data Association
• 1FB — Single line, Flat Business rate;
• ADT — American District Telegraph Company
• GBT — Ground Based Tower
• SAF — System Access Fee
• NCSA — National Center for Supercomputing Applications
• VLSI — Very-Large-Scale Integration
• VF — Voice Frequency
• DCA — Dynamic Channel Assignment
• LOO — Likelihood of Occurrence
• AOL — America on line
• HLR — Home Location Register
• DUA — Directory User Agent
• TDD — Time Division Duplex
• EMR — Electromechanical Relay
• MPI — Minimum Picture Interval
• SSM — Spread Spectrum Modulation
• TFTP — Trivial File Transfer Protocol (ATM)
• RCC — Radio Common Carrier
• NRPB — National Radiological Protection Board
• CONUS — Contiguous United States
• RAU — Remote Access Unit
• WAR — Weekly Activity Report
• DSS — Digital Signature Standard
• DSN — Defense Switched Network
• PP — Polypropylene
• IRTF — Internet Research Task Force
• CAL — Calorie
• OML — Object Model Library
• NIU — Network Interface Unit
• SIL — Solid Immersion Lens
• RNX — Restricted Numeric eXchange
• TCIC — Trunk Circuit Identification Code
• EDC — Electronic Dispersion Compensator
• AAV — Accountholder Authentication Value
• ADB — Apple Desktop Bus
• COT — Central Office Terminal
• BCH — Bose-Chaudhuri-Hocquenghem Coding
• CMRS — Commercial Mobile Radio Service
• COAX — Coaxial
• DCMI — Dublin Core Metadata Initiative (Online Computer Library Center)
• RCS — Radar Cross Section
• BOSS — Binary Object Storage System
• BER — Basic Encoding Rules (ASN.1)
• PMT — Program Management Team
• IPM — Inches Per Minute

• CBEMA — Computer & Business Equipment Manufacturers Association
• NDVI — Normalized Difference Vegetation Index
• NF — Noise Factor
• ALB — Analog Loopback
• DPSK — Differential Phase Shift Keying
• DOT — Department of Telecommunications (India)
• APDU — Application Protocol Data Units
• IPS — Instructions Per Second
• DTI — Digital Trunk Interface
• LANE — Local Area Network Emulation
• JDK — Java Development Kit
• PAM — Payload Assist Module
• NCP — Network Control Protocol
• RACH — Random Access Channel
• SPD — Serial Presence Detect
• ET — Electronic Transmission
• CMIP — Common Management Information Protocol (ATM)
• DEMUX — Demultiplexer
• CRTS — Cellular Radio Telecommunications Service
• ACSE — Association Control Service Element
• TEL — Telephone
• DDU — Disk Drive Unit
• ACC — Area Control Center
• AVR — Automated Voice Response
• NAT — Network Address Translation
• DCS — Data Collection System (NOAA Polar Orbiting Satellites)
• EOB — End Of Business
• MC — Maintenance Control
• 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
• SNA — System Network Architecture
• TL1 — Transaction Language 1
• FOD — Fax on Demand
• DDCMP — Digital Data Communications Message Protocol
• VBR — Variable Bit Rate (ATM)
• EST — Establish
• ST — Such That
• DDI — Direct Dialing Incoming
• RSL — Restricted Service License
• IRQ — Interrupt Request
• REPT — Report
• SIM — Subscriber Identification Module
• CAMA — Centralized Automatic Message Accounting
• LDN — Local Directory Number
• CND — Calling Number Display
• DVMRP — Distance Vector Multicast Routing Protocol
• AOS — Alternate Operator Service
• ILEC — Incumbent Local Exchange Carrier
• 3-D — 3-Dimensional
• ILD — International Long Distance
• LS — Loop Start

• QI — Quality Indicator
• MLM — Multi-Longitudinal Mode
• IAB — Internet Architecture Board
• BLER — Block Error Rate
• CDM — Conceptual Data Model
• FAC — Forced Authorization Code
• INSAT — Indian National Satellite
• CRLF — Carriage-Return Line-Feed
• L2TPV3 — Layer 2 Tunneling Protocol Version 3
• VTS — Vessel Traffic Service
• ACT — ACTIVITY, ACTIVITIES
• IAD — Integrated Access Device
• GI — Graded-Index
• ABM — Asynchronous Balanced Mode
• DSI — Digital Speech Interpolation
• BLOS — Beyond Line-Of-Sight
• VAS — Value Added Services
• EA — Extended Address Field Bit
• UML — Unified Modeling Language (Object Management Group, OMG)
• MA — Message Analysis
• SDM — Service Delivery Management
• PEM — Privacy-Enhanced Mail
• DTAP — Direct Transfer Application Process
• FGD — Feature Group D
• SDP — Software Development Plan
• APN — An Access Point Name
• CNG — comfort noise generation
• FCA — Fixed Channel Allocation
• 3G — 3rd Generation Wireless Format
• MP — Modulation Parameter
• ALOC — Average Length Of Call
• 2G — Second Generation Wireless Systems
• BSI — British Standards Institution
• RXQUAL — Received Signal Quality
• NFPA — National Fire Protection Association
• SCPC — single channel per carrier
• AMSS — Automatic Message Switching System
• DL — Definition List
• COMINT — Communications Intelligence
• MSW — Most Significant Word
• PACS — Personal Access Communications System
• UDP — Up Down Pair
• OOP — Object-Oriented Programming
• YAHOO — You Are Hazy Over Oranges
• C3I — Command, Control, Communications & Intelligence
• FGA — Feature Group A
• EBCDIC — Extended Binary-Coded Decimal Interchange Code
• SITA — Société Internationale de Télécommunications Aéronautiques
• CIP — Channel Interface Processor
• CODEC — Coder/decoder

• DM — Differential Mode
• IG — Interface Group
• OT — Office of Telecommunications
• CPC — Calling Party Control
• AWG — arrayed waveguide grating
• FDI — Feeder Distribution Interface
• ACA — Adaptive Channel Allocation
• LIF — Logical Interchange Format
• CRV — Call Reference Value
• NII — National Information Infrastructure (USA)
• TC — Transmission Convergence (ATM)
• AMPS — Advanced Mobile Phone Service (cellular phone standard)
• ISG — Information Systems Group
• LRC — Longitudinal Redundancy Check
• CRB — Cramer-Rao Bound
• ICL — Inserted Connection Loss
• 4GL — Fourth-Generation Language
• RJE — Remote Job Entry
• BTAM — Basic Telecommunications Access Method
• AMPS — Advanced Mobile Phone System
• CIAC — Computer Incident Advisory Capability
• BHCA — Busy Hour Call Attempt
• ARSR — Air Route Surveillance Radar
• NAK — Negative Acknowledge
• RRN — Routing Recording Number
• EBIC — Electron Beam Induced Current
• VPA — Valid Peripheral Address
• ADC — Access Deficit Charge
• LPD — Low Probability of Detection
• MCC — Mission Control Center (JSC)
• HSCSD — High-Speed Circuit-Switched Data
• FDD — Frequency Division Duplex
• NTDS — Naval Tactical Data System
• CNG — Fax Calling Tone
• TRS — Trunked Radio Systems
• DLP — Data Link Processor
• UMA — Unlicensed Mobile Access
• LSW — Least Significant Word
• CAC — Connection Admission Control (Asynchronous Transfer Mode)
• SMDS — Switched Multimegabit Data Service (ATM)
• TCB — Telecommunication Certification Body
• CMA — Communications Management Association
• BAN — Building Area Network
• VLAN — Virtual Local Area Network
• CCCH — Common Control Channel
• HSPA — High Speed Packet Access
• RMS — Resource Management System
• SOS — Save Our Souls (Help!)
• CLK — Clock
• NIMBY — Not In My Back Yard

• LRC — Learning Resource Center
• STP — standard temperature and pressure (0° and 1 atm)
• POP — Post Office Protocol
• LCR — Least Cost Routing
• DPT — Dynamic Packet Transport
• SN — Switching Network
• CLDC — Connected Limited Device Configuration
• RPV — Remotely Piloted Vehicle
• ALI — Automatic Location Information
• TXM — Transmission X-ray Microscope
• CIRC — Cross-Interleaved Reed-Solomon Code
• SMB — Server Message Block
• SISIR — Singapore Institute of Standards and Industrial Research
• FMC — Fixed Mobile Convergence "Mobile UC or Unified Communications over Wireless"
• NAS — Network-Attached Storage
• EBS — Electron Bombarded Silicon
• INE — Intelligent Network Element
• VBA — Visual BASIC for Applications
• CIC — Carrier Identification Code
• DISN — Defense Information Systems Network
• NCF — Network Control Facility
• VN — Virtual Network
• UART — Universal Asynchronous Receiver/Transmitter
• CLETS — California Law Enforcement Telecommunication System
• NC — Network Channel
• WSDL — Web Services Description Language
• ASAR — Advanced Synthetic Aperture Radar 
• DXC — Digital Cross Connect
• BOM — Bit-Oriented Message
• EULA — End User License Agreement (usually in reference to software)
• CHTML — Compact Hypertext Markup Language
• TT — Text-Telephone
• MR — Mobile Router
• FRAD — Frame Relay Access Device
• NOAO — National Optical Astronomy Observatories (Tucson, AZ)
• EIR — Equipment Identity Register
• EVA — Electronic Video Agent
• TD — Transmit Data
• BIS — Brought Into Service
• BSC — Bi-Synchronous Communications
• CCIR — International Radio Consultative Committee (French Acronym)
• ARM — Asynchronous Response Mode
• COC — Central Office Connection
• CCP — Compression Control Protocol
• CALEA — Communications Assistance for Law Enforcement Act
• IR — International Roaming
• ISI — Intersymbol Interference
• RAU — Radio Access Unit (Army)
• FMR — Follow Me Roaming
• RSS — Radio Service Software (Motorola)

• SVC — Switched Virtual Circuit (ATM)
• CPG — Converged Packet Gateway
• SLAM — Scanning Laser Acoustic Microscope
• EEROM — Electronically Erasable Read-Only Memory
• RICK — Repeater Interface Communications Kit
• MCP — Microsoft Certified Professional
• DIS — Draft International Standard
• DCAS — Downloadable Conditional Access System
• AF — Assured Forwarding
• RMON — Remote Monitoring
• FECN — Forward Explicit Congestion Notification (ATM)
• GAN — Global Area Network
• RDT — Recall Dial Tone
• FNN — Full National Number
• CMOS — Complementary Metal Oxide Semiconductors
• ATS — Automatic Transfer Switch
• OMF — Object Management Framework
• MHO — My Humble Opinion
• DSCP — Differentiated Services Code Point
• AAS — advanced automation system (FAA)
• MPLS — Multi Protocol Label Switching
• CAVE — Cellular Authentication and Voice Encryption Algorithm
• ULL — Unbundled Local Loop
• BCDIC — Binary Coded Decimal Interchange Code
• TOMS — Total Ozone Mapping Spectrometer (satellite Instrument)
• VXML — Voice eXtensible Markup Language
• TOP — technical/office protocol
• POE — power over ethernetinjector
• TIFF — Tag Image File Format
• 4W — Four-Wire
• WVOIP — Wireless Voice over Internet Protocol
• VPWS — Virtual Private Wire Service
• PDL — Positioning Data Link
• RISC — Reduced Instruction Set Computing
• TEI — Terminal Endpoint Identifier
• ADP — Automatic Data Processor
• CCR — Customer Controlled Reconfiguration (Sprint)
• CMC — Career Management Center
• BT — Burst Tolerance
• RSS — root-sum-square
• FI — Format Identifier
• OD — Outside Diameter
• SSN — Switched Service Network
• FC — Frame Control
• CICS — Customer Information Control System (IBM Mainframe Software; Kicks Or C-I-C-S)
• CCNA — Cisco Certified Network Associated
• ASN.1 — Abstract Syntax Notation One
• TCA — Threshold Crossing Alert
• VHSIC — Very High-Speed Integrated Circuit
• ASN.1 — Abstract Syntax Notation 1

• FTAM — File Transfer Access and Management
• WFA — Wait for Answer
• ASYNC — Asynchronous
• CACH — Call Appearance Call Handling
• RDBMS — Relational Data Base Management System (Oracle)
• ITT — Invitation To Tender
• CV — Coding Violation
• RGN — Region
• SCR — Sustainable Cell Rate
• WARC — World Administrative Radio Conference
• VLSI — Very Large-Scale Integration
• USA — Underground Service Alert
• MGC — Multimedia Gateway Controller
• VSAT — Very Small-Aperture Terminal
• DNSIX — Defense Network Security Information Exchange
• FSK — Frequency Shift Keying
• IPVX — Internet Protocol version X
• IESG — Internet Engineering Steering Group
• 4G — Fourth Generation Wireless Systems
• YABA — Yet Another Bloody Acronym
• CID — Craft Interface Device
• RQMT — Requirement
• 3GPP — Third-Generation Partnership Project
• SONET — Synchronous Optical Network
• SMS — Service Management System
• TDD — Telecommunications Device for the Deaf
• WTS — Wireless Telecommunications Symposium
• DPCM — differential pulse code modulation
• ECM — Error Correction Model
• CFNRY — Call Forwarding on No Reply
• SRL — Singing Return Loss
• IRF — Impulse Response Function
• EDFA — Erbium-Doped Fiber Amplifier
• SSMA — Spread-Spectrum Multiple Access
• EMS — Element Management System (ATM)
• DACS — Digital Access Cross-connect System
• PET — positron emission tomography
• DOD — Direct Outward Dialing
• PNP — Plug-and-Play
• VSAM — Virtual Storage Access Method
• AUI — Attachment Unit Interface
• VCI — Virtual Channel Identifier
• SIP — Session Initiation Protocol
• CRS — Cell Relay Service
• WDA — Wireless Digital Assistant
• EMI — Electro-Magnetic Interference
• CIP — Continuous Improvement Program
• RCU — Radio Control Unit
• LB — Local Battery
• LH — Link Handler

• SWBD — Switchboard
• LDP — Label Distribution Protocol
• OBC — Onboard Computer
• IDF — Independent Distribution Frame
• ADM — Administration Building
• DARTS — Design Approach for Real-Time Systems
• OSF — Open Software Foundation
• ATS — Abstract Test Suite
• E — Echo Time Zone
• UMTS — Universal Mobile Telecommunications Service
• ERL — Echo Return Loss
• NSAI — National Standards Authority of Ireland
• DRFM — Digital Radio-Frequency Memory
• INTELSAT — International Telecommunications Satellite
• TU — Transmission Unit
• VCC — Virtual Channel Connection (ATM)
• SE — Southeast
• UAT — Universal Access Transceiver
• RDMA — Remote Direct Memory Access
• MAJ — Major
• NCC — Network Control Center (GSFC)
• CC — Composite Clock (SONET)
• LT — Line Termination
• TACSAT — Tactical Satellite
• OMA — Open Mobile Alliance
• LSI — Large Scale Integration -> VLSI
• RADIUS — Remote Authentication dial In User Service
• DCF — Distributed Coordination Function
• FTTK — Fibre To The Kerb
• ANC — Access Network Controller
• CSU — Channel Service Unit
• PUK — PIN (Personal Identification Number) Unlocking Key
• KSU — Key Service Unit
• FEA — Finite Element Analysis
• ESCON — Enterprise System Connection
• DAC — Digital-To-Analog Converter
• ACF — Advanced Communications Function (IBM)
• CON — Concentrator
• CTIA — Cellular Telecommunications Industry Association
• CRBT — Caller Ring Back Tone
• NRP — Network Resource Planning
• MF — Multiple Frequency
• DPA — Distributed-Power Architecture
• VESA — Video Electronics Standards Association
• SKU — Stockkeeping Unit
• PD — Pulse Duration
• ABBR — Abbreviation
• NDS — Novell Directory Services
• VRML — Virtual Reality Modeling Language
• LAG — Link Aggregation Group

• LI — Length Indicator
• MMM — Mobile Media Mode
• PCCA — Portable Computer Communications Association
• IPCP — Internet Protocol Control Protocol
• STN — Station
• STMR — Sidetone Masking Rating (telecommunications)
• RCP — Right-Hand Circular Polarization
• MSRN — Mobile Station Roaming Number
• VDR — Voice Digitization Rate
• YA — Yet Another
• DA — deca
• CSR — Customer Service Report
• RP — Radio Port
• TLT — Test Loop Translator
• PARC — Palo Alto Research Center
• 4WAI — Four-Wire Analog Interface
• CTI — Computer Telephony Integration
• RX — Receive
• OMP — Open Management Platform
• DIL — Direct Inward Line
• NREN — National Research and Education Network
• DTE — Digital Terminal Equipment
• ETN — Electronic Tandem Network
• DTU — Data Transfer Unit
• 3G — Third Generation (mobile communication system)
• FSAI — Fiber Serving Area Interface
• TIA — Telecommunications Industry Association
• CPS — Cycles Per Second (now Hertz)
• MSDP — Multicast Source Discovery Protocol
• NE — North-East
• IMAP — Internet Mail Access Protocol
• TTYL — Type To You Later
• FDOA — Frequency Difference Of Arrival
• WAE — Wireless Application Environment
• SCR — System Change Request
• IPLC — International Private Leased Circuit
• B2B — Business-to-Business
• LIDB — Line Information DataBase
• MFC — Multi-Frequency Code
• EMF — Event Management Framework
• CPAP — Customer Premises Access Profile
• F — Frequency
• CPE — Customer Premise Equipment
• BELLCORE — Bell Communications Research, Inc.
• DFG — difference-frequency generation
• PSN — Packet Switched Network
• FOIP — Fax Over Internet Protocol
• CPH — Call Party Handling
• DLCI — data link connection identifier
• SS1 — Signalling System 1 (500/20 Hz tones)

• GDK — GIMP (GNU Image Manipulation Program) Drawing Kit
• OSA — Open System Architecture
• DE — Discard Eligibility (ATM)
• AAL5 — ATM (Asynchronous Transmission Mode) Adaptation Layer 5
• 2G — Second generation cellular
• GS — Ground Start
• IEEE-CS — Institute of Electrical and Electronics Engineers Computer Society
• DPDT — Double-Pole Double-Throw
• EGSM — Extended Global System for Mobile Communications
• DPBX — Digital Private Branch Exchange
• CSIRO — Commonwealth Scientific and Industrial Research Organization
• TTY — teletype terminal
• DAS — Data Acquisition System
• TP — Termination Point
• VPX — Virtual Path Cross-Connect
• UPT — Universal Personal Telecommunications
• VR — Virtual Router
• LCF — Location Confirm
• VOB — Versioned Object Base
• PLL — Phase Locked Loop
• DISA — U.S. Defense Information Systems Agency
• CLCC — Ceramic Leaded Chip Carrier
• SDSL — Symmetric Digital Subscriber Line
• ATS — Air Traffic Services
• CLD — Cross-Layer Design
• VNS — Virtual Network System
• RLU — Remote Line Unit
• BY — Busy
• WORM — Write-Once, Read-Many
• DTL — Defense Telephone Link
• RDT — Remote Digital Terminal
• WSFL — Web Services Flow Language
• CCNA — Cisco Certified Network Administrator
• DRQ — Disengage Request
• SCM — Single-Carrier Modulation
• GBPS — Gigabits per second
• TCC — Transmission Control Code
• ENV — Environment
• RFR — Radio Frequency Radiation
• ESPN — Entertainment and Sports Programming Network
• 1-ESS — x-ESS series of Electronic Switching Systems
• WIN — Wireless Intelligent Network
• FMS — Fixed Mobile Substitution
• OWS — Operator Work Station
• TNI — Telephone Network Interface
• ET — Exchange Terminal
• GERAN — GSM (Global System for Mobile communications) Edge Radio Access Network
• ADCCP — Advanced Data Communication Control Procedures
• SMPTE — Society of Motion Picture and Television Engineers, Inc.
• DQDB — Distributed Queue Dual Bus

• ARFA — Allied Radio Frequency Agency
• SAT — Satellite
• VOB — Voice Over Broadband
• CTO — Commonwealth Telecommunications Organisation
• VTAM — Virtual Telecommunication Access Method
• PSDN — Public Switched Digital Network
• AT — Attenuation
• ESCA — photoelectron spectroscopy for chemical analysis
• SSP — Security Service Provider
• RIPE NCC — Reseaux IP Europeens Network Coordination Centre
• LIM — Line Isolation Monitor
• CAPTAIN — Character And Pattern Telephone Access Information Network
• SMI — Structure of Management Information
• CRBT — Color Ring Back Tone
• LIS — Lightning Imaging Sensor
• EDSX — Electronic Digital Signal Cross-Connect
• IEEE-SA — Institute of Electrical and Electronics Engineers - Standards Association
• CPOP — Circuit Precedence Over Packet data
• TBCD — Telephony Binary Coded Decimal
• TCP/IP — Transmission Control/Internet Protocol
• ASE — Application Service Element
• HFC — Hybrid Fiber Coaxial
• WSA — Wireless Security Auditor
• PTT — Push to Talk Technology
• TP — Transition Point
• EM — Element Manager
• MMDS — Multichannel Multipoint Distribution Service
• SPID — Service Profile Identifier
• AMA — automatic message accounting
• BATM — Basic Telecommunication Access Method
• SPA — Special Prorate Agreement
• QS — Quasi-Synchronous
• TCM — Time Compression Multiplexer
• UCF — Unregistration Confirm
• LRM — Long Reach Multimode
• PTP — Point To point Protocol
• PDSO — Packet Data Security Overlay
• USF — Universal Service Fund
• IWF — Interworking Function
• TSC — Test System Controller
• DIV — Divisionsion
• ISO — Independent System Operator (US) (see also TSO) Responsible for grid management, but does not own assets. (electricity)
• ADPC — Automatic Data Processing Center
• DXF — Data Exchange Format
• FPS — Framing Pattern Sequence
• EFCI — Explicit Forward Congestion Indication (ATM)
• ASTD — American Society of Training and Development (Alexandria, Virginia)
• CVD — Chemical Vapor Deposition
• LCP — Local Control Point
• SSAP — Source Service Access Point

• CTE — Computer Telephony Engineer
• MTA — Message Transfer Agents (Internet)
• CC — Country Code
• FCA — Free Carrier Alongside
• HTML — Hyper-Text Markup Language
• CIS — Center for Integrated Systems
• X — X Window System
• ANSI-41 — ANSI standard for mobile management
• PBT — Polybutylene Terephthalate
• ECS — Encryption Control Signal
• BP — Block Parity
• CODASYL — COnference on DAta SYstems Languages
• MGCP — Multimedia Gateway Control Protocol
• ADTM — Asynchronous Data Transfer Mode
• FIOS — Fiber Optic Services
• NE — Network Element
• PJC — Pointer Justification Count
• DICOM — Digital Imaging and Communications in Medicine
• BUFR — Binary Universal Form for the Representation (of data)
• LBR — Low Bit Rate
• IBSS — Independent Basic Service Set
• 4WA — Four Wire Analog
• MIS — Management Information Service
• DOCSIS — Data over Cable Service Interface Specification
• IPRC — Intellectual Property Rights Committee
• MPU — Main Processor Unit
• ATU-C — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Central office end
• MTD — Moving Target Detection
• TBPS — Terabits Per Second
• FTTP — Fiber To The Premises
• COFA — Change Of Frame Alignment
• EMS — Enhanced Messaging Service
• DSSSL — Document Style Semantics and Specification Language
• LLA — Link Level Access
• TDWR — Terminal Doppler Weather Radar
• RECON — Reconnaissance
• PTP — Point to Point Transmission Service (electricity)
• CDV — Cell Delay Variation(ATM)
• DMT — Discrete Multi-Tone Technology
• CBMS — Computer-Based Message System
• WNMS — Wireless Network Management System
• PLCP — Physical Layer Convergence Procedure
• LFACS — Loop Facility Assignment and Control System
• ELFEXT — Equal-Level Far-End Cross-Talk
• BAM — Basic Access Module
• CCA — Carrier-Controlled Approach
• SCCS — Switching Control Center System
• BNC — Bayonet Neill-Concelman
• L2F — Layer 2 Forwarding protocol
• SETI — Search for Extraterrestrial Intelligence

• NCAR — National Center for Atmospheric Research (US)
• SCC — Specialized Common Carrier
• RTC — Right to Carry
• BASIZE — Buffer Allocation Size
• MAP — Mobile Application Part
• DMS — Defense Messaging System
• VQV — Voice Quality Value
• PIC — Programmable Interrupt Controller
• L2TP — Layer 2 Tunneling Protocol
• LXT — Local Exchange Terminal
• TP — Telephone Pole
• BIND — Berkeley Internet Name Domain
• ATD — Advanced Technology Demonstration
• GSM — Groupe Speciale Mobile
• VSM — Vestigial Sideband Modulation
• IDCU — Integrated Digital Carrier Unit
• BSA — Basic Service Area
• CT — Cordless Telecommunications
• P&A — Privacy and Authentication
• CSP — Converged Service Platform
• AAV — Alternate Access Vendor
• DPST — Double-Pole Single-Throw
• TLP — Transmission Level Point
• S/N — Signal-to-Noise ratio
• PTT — Push to Talk Taster
• B8ZS — Binary Eight Zero Substitution
• CDM — Configuration Data Manager
• AMOLED — Active Matrix Organic Light-Emitting Diode
• 4 GIG — 4 Giga Intellectual Gadget
• AMR — Automated meter reading also known as Automatic Meter Reading
• SDNS — Secure Data Network System
• CDVT — Cell Delay Variation Tolerance
• WFG — Wireless Firewall Gateway
• SYM — Symmetric
• FAT — Final Acceptance Testing
• SMSC — Short Message Service Center
• NMC — Network Management Center
• TCS — Telephony Control Specification
• CLEC — Competitive Local Exchange Carrier
• LRQ — Location Request
• DOD — Dial on Demand
• TSDU — Transport Service Data Unit
• ECS — Environmental Control System (Subsystem)
• BSID — Base Station Identity
• NSAP — Network Service Access Point
• SQL — Specified Quality Level
• AAP — Alternate Access Provider
• CAR — committed access rate
• CERN — Conseil Europeen Pour La Recherche Nucleaire
• BAF — Bellcore AMA (Automatic Message Accounting) Format

• TACACS — Terminal Access Controller Access Control System
• TRMM — Tropical Rainfall Measuring Mission (US-Japan)
• ESN — Electronic Serial Number
• MSC — Mobile Switching Center
• DDM — Data Distribution Manager
• STU — Secure Telephone Unit
• DDSN — Digital Derived Services Network
• TDRSS — Tracking and Data Relay Satellite System
• AAL — ATM (Asynchronous Transmission Mode) Adaptive Layer
• LCAS — Link Capacity Adjustment Scheme
• CDA — Communications Decency Act's
• VISSR — visible and infrared spin scan radiometer (GOES)
• TPS — Telephone Preference Service
• RAD — Recorded Announcement Device
• UBR — Unspecified Bit Rate
• BDE — Borland Database Engine
• DCS — Defense Communications System
• VCA — Voice Connecting Arrangement
• ACF — Access Coordination Function
• CSA — Canadian Standards Association (like UL)
• TTL — ToS and Time-to-Live
• DL — Downlink Message
• CES — Circuit Emulation Service
• SCE — Service Creation Environment
• LSAP — Link Service Access Point
• RRC — Root Raised-Cosine
• CM — Connection Manager
• FR — Functional Requirement
• SCH — Synchronization Channel
• 3G HSPA — Third-Generation High-Speed Packet Access
• ALI — Automatic Location Identifier
• MTP — Message Transfer Part
• NCP — Network Control Program
• DBRNC — deciBel Relative to Noise in a Circuit
• BPSK — Binary Phase-shift Keying
• NT — New Technology, also Windows NT
• SIMT — Système interbancaire marocain de télécompensation
• LSC — Link State Control
• CSR — Customer Service Request
• FMS — Fraud Management System
• N-AMPS — Narrowband Advanced Mobile Phone System
• APPC — Advanced Program-to Program Communications
• MITI — Ministry of International Trade and Industry
• ACM — Address Complete Message
• GLT — Great Lakes Telecom
• PTT — Push to Talk Testing
• LCGN — Logical Channel Group Number
• HPN — Home Phone Network
• PNP — Positive-Negative-Positive
• MFLOPS — Millions of Floating Point Operations per Second

• LMS — Location and Monitoring Service
• HSCSWD — High-Speed Circuit-SWitched Data
• VSC — Vertical Service Code
• CDSL — Consumer Digital Subscriber Line
• AI — Adapter Interface
• WCDMA — Wideband Code Division Multiple Access
• DDU — Digital Data Unit
• CSCW — Computer-Supported Cooperative Work
• B-CPE — Broadband Customer Premises Equipment
• BNCC — Base Network Control Center
• BDFB — Battery Distribution Feeder Bay
• LP — Line Pair
• AMTI — Airborne Moving Target Indicator
• PLE — Path Length Efficiency
• TOC — Telecommunication Operations Center
• DXI — Data Exchange Interface
• MCR — Minimum Cell Rate (ATM)
• MMC — Microsoft Management Console (Microsoft)
• DMT — Discrete Multi-Tone
• HDTV — High-Definition Television
• AFPS — Automatic Facility Protection Switching
• IVP — Integrated Voice Protocol
• SRA — Seamless Rate Adaptation
• TDM — Time Division Multiplexing
• DECCO — DISA Defense Commercial Communications Office
• RADINT — Radar Intelligence
• SDP — Session Description Protocol
• A/D — Analog-to-Digital converter
• DSCS — Defense Satellite Communication System
• DMT — Discrete Multi-tone Transmission
• PIM — Protocol Independent Multicast
• UTL — Utility
• OXCO — Oven-Controlled Crystal Oscillator
• ALCAP — Access Link Control Application Protocol
• DLL — Digital Local Line
• P2P — Person-to-Person
• CCITT — Comit? Consultatif International T?l?graphique et T?l?phonique
• GMSS — Global Mobile Satellite System
• MAG — Mobile Access Gateway
• COP — Character Oriented Protocol
• CPT — Cellular Paging Teleservice
• NCOS — Network Class Of Service
• IDCP — Internet Device Control Protocol
• D3 — Digital channel bank, Third generation
• FOC — Fiber-Optic Cable
• IDLC — Integrated Digital Loop Carrier
• FEM — Finite Element Method
• 100VG — 100 Voice Grade (IEEE 802.12 AnyLAN Standard)
• MLA — Modern Language Association
• IV&V — independent verification and validation

• SR — Scanning Radiometer
• LVM — Line Verification Module
• SPE — Synchronous Payload Envelope
• DS-3 — Digital Signal, Level 3
• B-ISDN — Broadband ISDN
• BT — Bluetooth Tablet
• DDLD — Direct Dial Long Distance
• WTL — Wireless Transport Layer
• CCCI — Command, Control, Communications and Intelligence
• TDR — Time-Domain Reflectometry
• SMMR — Scanning Multichannel Microwave Radiometer
• UCM — Use Case Map
• WNAP — Wireless Network Access Point
• MTI — Moving Target Indicator
• COAM — Customer Owned And Maintained
• WK — Week
• CSAR — Combat Search and Rescue
• TELNET — Telecommunications Network Protocol
• URN — Uniform Resource Namespace
• WFA — Work Force Administration
• XWI — XML (extensible markup language) for Wireless Images
• LAAS — Local Area Augmentation System
• AMTFT — Active Matrix Thin Film Transistor
• OSD — Onscreen Display
• LULT — Line Unit/Line Termination
• ATB — Above-Ground Telecommunications Backbone
• PM — Processable Mode
• CDV — Compressed Digital Video
• DS0 — Digital Signal Zero
• CDA — Communications Decency Act of 1996
• MB — Measured Business
• FEAC — Far End Alarm and Control
• EPP — Enhanced Parallel Port (PC)
• DECT — Digital Enhanced Cordless Telecommunication
• TM — Thematic Mapper (Landsat)
• DEM — Digital Elevation Model
• PSQM — Perceptual Speech Quality Measure
• VO — Voice Only
• TRX — Tandem Repeater eXchange
• EV — electronvolt
• DAC — Digital to Analog Converter-Audio
• RQMTS — Requirements
• DAF — Directory Access Function
• RJ-14 — Registered Jack type 14 (2-wire connector)
• CBQ — Class-Based Queuing
• TED — Triteal Enterprise Desktop
• ANAC — An Automatic Number Announcement Circuit
• GFC — Generic Flow Control (ATM)
• FIFO — first-in, first-out
• VLF — Vertical-Laminar-Flow

• SR — Slow Release
• PCS — Personal Communications Services
• PY — person-year
• BPP — Billed Party Preference
• PMOS — P-channel Metal Oxide Semiconductor
• DW — Deep Water
• BSS — Broadband Switching System
• GSTN — General Switched Telephone Network
• 3GIP — Third Generation Internet Protocol
• NLM — NetWare Loadable Module
• SA — Selective Availability (on GPS transmissions)
• MUSIC — MUltiple SIgnal Classification
• SIGTRAN — Signaling Transport
• ESA — Enhanced Subscriber Authentication
• BSRF — Basic System Reference Frequency
• CLP — Cell Loss Priority (ATM)
• CGI — Computer Graphics Interface
• FGDC — Federal Geographic Data Committee's
• BAOC — Barring of All Outgoing Calls supplementary service
• TMSI — Temporary Mobile Subscriber Identity
• NFR — Near-Field Recording
• SAR — Segmentation and Reassembly (ATM)
• CGI — Cell Global Identity
• SINAD — SIgnal-to-(Noise And Distortion) ratio
• ATCA — Advanced Telecom Computing Architecture
• RPCU — Radio Port Control Unit
• SIO — Service Information Octet
• AEA — American Electronics Association's
• BCIX — Berlin Commercial Internet Exchange
• MSI — Maritime Safety Information
• SFN — Single Frequency Network
• AECT — Association for Educational Communications and Technology's
• NW — North West
• ILETS — International Law Enforcement Telecommunications Seminar
• NMS — NetWare Management System
• CDDI — Copper Distributed Data Interface
• LSP — Label Switched Path
• OOK — On/Off Keying
• MBS — Maximum Burst Size (ATM)
• NWK — Network
• STM — Synchronous Transfer Mode
• BHCC — Busy Hour Call Completions
• CNID — Calling Number Identification Display
• CAN — Controller Area Network
• ISC — International Switching Center
• QOI — Quality of Information
• TP — Transaction Processor
• FFH — Fast Frequency Hopping
• TRIG — Trigger
• BTP — Business Telecom Products, Inc.

• MMSI — Maritime Mobile Service Identity
• TSR — Terabit Switch/Router
• CAM — Computer-Aided Manufacturing
• DACS — Digital Access and Cross-Connect System
• VCR — Videocassette Recorder
• CAMEL — Customized Applications for Mobile-network Enhanced Logic
• CSDU — Core Service Data Unit
• EVC — Electronic Voucher Charging
• SMS — System Management Server
• LMDS — Local Multipoint Distribution Service
• OLS — Optical Line System
• AMP — amplifier / amplification
• EA — expedited acknowledgement
• GTB — Global Telecom Brokers
• DCC — Digital Control Channel
• PSO — Professional Services Organization
• UNI — User-Network Interface
• CMT — Commercial Metering Transponder
• SPI — Security Parameters Index
• TSGR — Transport System Generic Requirements
• NTU — Network Termination Unit
• DCEF — Distributed Cisco Express Forwarding
• BC — Basic Call
• SAPI — Service Access Point Identifier
• BIC — Bus Interface Controller
• AB — Answer Back
• MTS — Message Transmission Subsystem
• ROW — Rest Of World
• CCLC — Carrier Common Line Charge
• FTS — Federal Telecommunications System
• SPT — System Page Table
• IPXCP — Internetwork Packet Exchange Control Protocol
• DPNSS — Digital Private Network Signaling System
• IOC — Interoffice Channel
• SS7 — Signaling System 7
• IXC — interexchange carrier
• FPLMTS — Future Public Land Mobile Telecommunications System
• PSK — Phase Shift Key
• TRLR — Trailer
• SVI — Service Interception
• DUV — Data-Under-Voice
• DNI — Data Network Interface
• OIM — Operations Interface Module
• VOFR — Voice Over Frame Relay
• ULP — Upper Layer Protocol
• DUV — Deep Ultraviolet
• DNU — Do Not Use
• LN — Line
• ACEK — Authentication Encryption Key
• ODS — Operational Data Store (knowledge management)

• CAAS — Communications-as-a-Service
• NICT — National Institute of Information and Communications Technology
• AFRINIC — African Network Information Centre
• LR-WPAN — Low-Rate Wireless Personal Area Network
• MAC — Message Authenticity Check
• DLU — Digital Line Unit
• MILNET — Military Network
• AIS-L — Alarm Indication Signal - Line
• W-CDMA — Wideband Code Division Multiple Access
• ADPCM — Adaptive Differential Pulse Code Modulation
• TSI — time-slot interchange
• Z — Zulu Time
• PLCP — Physical Layer Convergence Protocol (ATM)
• SEM — Scanning Electron Microscopes
• ISD — International Subscriber Dialling
• ATRAC — Adaptive Transform Acoustic Coding
• BHCA — Busy Hour Call Attempts
• WWAN — wireless wide-area network
• DFE — Design For Environment
• CLASS — Cell Level ATM (Asynchronous Transfer Mode) Services Simulator
• MEH — Mobile-Executed Handoff
• LIU — Line Interface Unit
• WBMP — Wireless Bitmap
• ETSI — European Telecommunications Standard Institute
• PSN — Public Switched Network
• CVT — Circuit Validation Test
• DMT — Digital-Discrete Multi-Tone
• CEPT — Conférence Européenne des Administrations des Postes et des Télécommunications
• NEMP — Nuclear Electromagnetic Pulse
• DCO — Dial Central Office
• WAW — Wide Area Wireless
• GRX — GPRS Roaming Exchange
• ZBTSI — Zero Byte Time Slot Interchange
• WAR — Wireless Access Revolution
• LAPB — Link Access Protocol-Balanced
• DLE — Digital Local Exchange
• PMT — Photo Multiplier Tube
• SLIC — Subscriber Loop Interface Circuit
• OCI — object code insertion
• RNR — Receive Not Ready
• RBS — Robbed Bit Signaling
• AEIMP — Apple Event Interprocess Messaging Protocol
• WFT — Wireline Formation Test
• CPN — Customer Premise Network
• BSVCI — Broadcast Signaling Virtual Channel Identifier
• LEED — Low-energy Electron Diffraction
• UMTS — Universal Mobile Telecommunications Standard
• VGF — Voice Grade Facility
• FD — Full Duplex
• RDI-L — Remote Defect Indicator - Loop

• FRF-LMI — Frame Relay Forum - Local Management Interface
• ARD — Automatic Ring Down
• UIH — Unnumbered Information with Header check
• UDT — Unreliable Data Transfer
• CS — Connection Segment
• DLT — Digital Line Termination
• UMTS — Universal Mobile Telecommunication System
• VADB — Virtual Auto Dial Backup
• NARC — Non-Automatic Relay Center
• CCSA — Common Control Switching Arrangement
• COBE — Corporate Owned Business Only
• DLT — Delete
• ATU-R — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Remote terminal end
• CCITT — Comite Consultatif International Telegraphique et Telephonique (now ITU-T)
• SMU — Service Management Unit
• DNA — Do Not Answer
• BHP — Burst Header Packet
• AAS — Automatic Announcement Subsystem
• DSU — Digital Service Unit
• LORAN — Long Range Aid to Navigation System
• CCSS6 — Common Channel Signaling System # 6
• EIR — Excess Information Rate
• CU — Cooling Unit
• OCC — Occupancy
• CEE — Communaut? Economique Europ?enne
• CFOT — Certified Fiber-Optic Technician
• MEECN — Minimum Essential Emergency Communication Network
• ANT — ADSL Network Terminator
• BT — Back Trace
• PMMA — Polymethyl Methacrylate
• FAW — Frame Alignment Word
• MDN — Mobile Directory Number
• SES — Scientific and Engineering Software
• 3GSM — Third-generation Global System for Mobile (communications)
• STM — Scanning Tunneling Microscopy
• RCT — remote Control Terminal
• MOS — Metal Oxide Semiconductor (FET Devices)
• ISSI — Inter-Switching System Interface
• ANSI — Advanced Network Signaling Input
• CQ — Communications Quality
• DTR — Down-Time Ratio
• TCPA — Telephone Consumer Protection Act
• HUMAN — High-speed Unlicensed Metropolitan Area Network
• WCMP — Wireless Control Message Protocol
• CCC — CDMA Cluster Controller
• BDSL — Broadband Digital Subscriber Line
• ECC — Emergency Communications Center
• BB — Blackberry
• JDC — Japan Digital Cellular
• BAN — Billing Account Number

• ATIS — Automatic Transmitter Identification System
• LSMS — Local Service Management System
• BABT — British Approvals Board for Telecommunications
• DMI — Desktop Management Interface (computing)
• PSLV — Polar Satellite Launch Vehicle (Indian Space Research Organization; India)
• E2E — End-to-End
• FEBE — Far End Block Error (SONET)
• WTNM — Working Telephone Number Management
• ECDIS — Electronic Chart Display Information System
• MCPC — Multiple Channels Per Carrier
• DUN — Dial-Up Networking
• * — Star, special function key
• V — Vector
• SDN — Software Defined Network
• LOP-P — Loss Of Pointer - Path
• MBE — Molecular Beam Epitaxy
• LSI — Large-Scale Integration
• ZD — Zero Defects
• PHY — Physical Layer
• # — Number sign, octothorp; special function key
• SAM — Service Access Multiplexer
• AIU — Analog Interface Unit
• RADARSAT — Radar Satellite
• STA — Science and Technology Agency (Japan)
• WPKI — Wireless Public Key Infrastructure
• APR — Alarm Processing Remote
• MDCP — Media Device Control Protocol
• LQC — Line Quality Control
• NTSC — National Television Standards Committee
• ALT — Automatic Link Transfer
• TSD — Type Specific Driver
• INAP — Intelligent Network Application Part
• DNC — Do Not Call
• BCSM — Basic Call State Model
• TSC — Technical Standards Committee
• VFL — Visual Fault Locator
• RADSL — Rate Adaptive Digital Subscriber Line
• BFS — Broadcast File System
• NRZ — Nonreturn To Zero
• FLL — Fixed-Loss Loop
• DACS — Digital Access Carrier System
• LMS — Local Measured Service
• DOITT — Department of Information Technology and Telecommunications
• DF — Direction Finding or Finder
• QEDI — Quod Erat Demonstrandum
• OC-1 — Optical Carrier Signal, Level 1
• OID — Object Interaction Diagram
• BRAN — Broadband Radio Access Network
• CSI — Clearing Subnetwork Identification
• BUS — Broadcast and Unknown Server

• ETOC — Electronic Table of Contents
• USF — Universal Server Farm
• WSP — Wireless Service Provider
• BORSCHT — Battery feed, Overvoltage protection, Ringing, Signaling, Coding, Hybrid, and Testing
• AAL2 — ATM (Asynchronous Transmission Mode) Adaptation Layer 2
• CCR — Current Cell Rate (ATMF)
• SNIX — Single Noise Interference Xterminator
• ACU — Automatic Calling Unit
• RDSS — Radio Determination Satellite Service
• ASAS — All-Source Analysis System
• TARP — Target Identifier Address Resolution Protocol
• DLC — Digital Leased Circuit
• GOMP — Get Off My Phone
• QOD — Quality of Data
• AIS-V — Alarm Indication Signal - Virtual
• MMS — Multimedia Message Service
• SDHLR — Super-Distributed Home Location Register
• CSP — Continuous Speech Processing
• TC — Technical Committee (HL7)
• NAP — Network Access Point
• CD — Committee Draft
• ATSC — Advanced Television Systems Committee
• ITA — Illinois Telecommunications Association
• MAU — Multistation Access Unit
• SFX — Special Effects
• APS — Advanced Power System
• BTS — Base Transceiver Station (cellular)
• VPC — Virtual Path Connection (ATM)
• ADM 3X — DS3 Add-Drop Multiplex
• F/W — Firmware
• RCMAC — Recent Change Memory Administration Center
• IR — Information Request
• IOS — Internet Over Satellite
• MQFP — Metric Quad Flat Pack
• JISC — Japanese Industrial Standards Committee
• JSC — Joint Scientific Committee (ICSU, WCRP, and WMO)
• RAI — remote alarm indication
• KSPS — KiloSymbols Per Second
• FOTS — Fiber Optical Transmission System
• MEID — Mobile Equipment Identifier
• KTS — Key Telephone System
• SRS — Supported Residential Services
• IMTS — Improved Mobile Telephone Service
• LUNT — Line Unit Network Termination
• ML-PPP — Multilink Point-to-Point Protocol
• SDCCH — Standalone Dedicated Control Channel
• ACA — Automatic Circuit Assurance
• VLR — Visitor Location Register
• SR — Service Request
• CTTC — Centre Tecnològic de Telecomunicacions de Catalunya

• ARPT — Autorité de Régulation des Postes et Télécommunications
• CCH — Common Channel Handler
• TWX — Teletypewriter Exchange (Telex)
• DSP — Data Service Provider
• HDB3 — High-Density Bipolar Three-bit substitution
• DDS — Dataphone Digital Service (AT&T)
• C² — Command and Control
• LAT — Local Area Transport (network)
• ACNA — Access Customer Name Abbreviation
• NESC — National Electrical Safety Code
• AIS-P — Alarm Indication Signal - Path
• LRB — Loop Reverse Battery
• CASE — Computer-Aided Software Engineering
• CLI — Calling Line Identification
• ADTS — Ameritech Digital Transport Service
• DCSS — Digital Cross-connect Systems
• TACS — Total Access Cellular System
• CLF — Carrier Line Failure
• NSEP — National Security Emergency Preparedness
• TTC — Telemetry Telecommand and Control
• ECTF — Enterprise Computer Telephony Forum
• LMT — Lightwave Microcell Transceiver
• AGCH — Access Grant Channel
• LRF — Laser Range Finder
• APS — American Protective Services
• JMA — Japanese Meteorological Agency
• EC — Entropy Coding
• WAPI — Wireless LAN Authentication and Privacy Infrastructure
• TCL — Transverse Conversion Loss
• MP — Master Processor
• CSAA — Central Service Area Authority
• CONS — Connection-oriented Network Services
• DCA — Distributed Communications Architecture
• KEK — Key Encrypting Key
• BHA — Busy Hour Attempts
• VGC — Voice Grade Channel
• ESP — Essential Service Protection
• PRM — Performance Report Message
• RCF — Remote Call Forwarding
• ICLD — Inter-Channel Level Difference
• AL — Alignment
• GSM — Global System for Mobile telecommunications
• ATR — Advanced Telecommunications Research Institute
• UTP — Universal Transmission Protocol
• LFTYR — Ley Federal de Telecomunicaciones y Radiodifusión
• REA — Rural Electrification Administration (US)
• AUSPI — Association of Unified Telecom Service Providers of India
• EMV — EuroPay, MasterCard, Visa
• MBMS — Multimedia Broadcast/Multicast Service
• BCS — British Computer Society

• FEBE-F — Far End Block Error count - Fast data
• DTW — Dynamic Time Warping
• ATTRA — Appropriate Technology Transfer for Rural Areas
• DS-1 — Digital Signal, Level 1
• DOV — Data-Over-Voice
• SGS — Software Generation System
• DORA — EV-DO (EVolution-Data Optimized) standard Revision A
• DAS — Distributed Antenna System
• RLS — Recursive Least Squares
• PCIA — Personal Communications Industry Association
• SCO — Synchronous Connection Oriented
• USPI — Universal Serial Phone Interface
• FECC-F — Forward Error Correction Count - Fast data
• MED — Manipulative Electronic Deception
• NMC — Network Model Coverage
• ISP — International Signaling Point
• CALS — Computer Aided Acquisition and Logistic Support
• TOMS — Telecom Operations Management System
• USRT — Universal Synchronous Receiver/Transmitter
• INWATS — INward Wide Area Telecommunications Service
• RM-ODP — Reference Model for Open Distributed Processing
• CYTA — Cyprus Telecommunications Authority
• SNI — Service Node Interface
• VCC — Voice Call Continuity
• RLC — Radio Link Control
• ADTS — Automated Digital Terminal System
• WPBX — Wireless Private Branch Exchange
• PNE — Path Number Efficiency
• GOS — Gerry Otis Simpson
• AS — Active Service
• PTT — Post Telegraph and Telecommunications
• SMG — Super Master Group
• EDGE — Enhanced Data for GSM (Global System for Mobile communication) Evolution
• CALA — Customer Address Location Area
• DTU — Date/Time Update
• PFE — Power Feed Equipment
• MAPDU — Management Application Protocol Data Unit
• LDI — Long Distance Interconnect
• EST — Electroshock Therapy
• GTXC — Global Telephone Exchange Carrier
• ADIF — Accounting Data Interchange Format
• COI — Community of Interest
• GOSIP — Government Open Systems Interconnection Profile
• CACM — Communications of the ACM
• GOSIP — Government Open System Interconnection Profile
• BTO — Betts Telecom Oklahoma
• NAM — Number Assignment Module
• CL — cell loss
• DCB — Digital Channel Bank (Sprint)
• CT — Control terminal

• CEPT — Conference of European Posts and Telecommunications
• AEE — Agent Execution Environment
• MIN — Mobile Identification Number
• M/W — MicroWave
• BSSMAP — Base Station System Management Application Part
• IBS — In-Building Solutions
• CMAS — Cellular Management System
• CW — Call Waiting Supplementary Service
• RS-422 — Recommended Standard 422 (ANSI/EIA standard for transmitting serial data)
• CIPOA — Classical Internet Protocol over ATM (Asynchronous Transfer Mode)
• AQP — Association for Quality and Participation
• HQGSM — High-Quality Global System for Mobile communications
• FWS — Fixed Wireless Services
• CAIRO — Communications Audio Interface for Remote Operations
• LOB — Line Of Bearing/Balance
• EADAS — Engineering and Administrative Data Acquisition System
• PSC — Picture Start Code
• AVT — Audio Visual Telecommunications
• DACS — Digital Access Cross-Connect Switch
• DORK — Disciples Of The Righteous King
• BPOP — Building Point of Presence
• NSE — Network Software Environment
• MNOS — Metal-nitride-oxide Semiconductor
• DCS — Digital Cross-connect Switch
• PTO — U.S. Patent And Trademark Office
• CF — Coin First Payphone
• SCORM — Shareable Content Object Reference Model
• DMNG — Digital Mobile News Gathering
• CMOS — Cellular Management Operation System
• CLOS — Clear Line Of Sight
• ASP — Active Signaling Protocol
• NMC — Nortel Matra Cellular
• DECT — Digital Enhance Cordless Telecommunications
• SMDR — station message detail recording
• LTU — Line Termination Unit
• RBT — Ring Back Tone
• TPF — Transmission Priority Field
• PTM — Point-To-Multipoint
• HTO — Hellenic Telecommunications Organisation
• NDIS — Network Driver Interface Specification (Microsoft Windows NT)
• E-TDMA — Expanded Time Division Multiple Access
• WAWS — Washington Area Wideband System
• WDF — Wireless Data Forum
• CPS — Customer Premises System (Bellcore)
• RSN — Regional Service Network
• WDMW — Web Directory for Mobile and Wireless
• IPTD — Internet Protocol Telephony Design
• SMT — station management (protocol)
• BANC — Broadband Access Network Coordination
• RSI — Record Status Indicator

• DDSD — Delay Dial Start Dial
• M2M — Multipoint-to-Multipoint
• CD-ROM — Compact Disk-Read-Only Memory
• E — Exchange
• DF — Distributing Frame
• ETSI — European Telecommunications Standards Institute
• CDR — Common Data Rate
• RU — Release Unit
• SINS — Ship’s Inertial Navigation System
• MVDS — Microwave Video Distribution System
• DPDCH — Dedicated Physical Data Channel
• TR — Temporal Reference
• AFI — Authority and Format Identifier
• FOE — Fiber Optic Equipment
• VGCP — Voice Grade Channel Processor
• ACMA — Atlantic Cable Maintenance Agreement
• PAGCH — Paging and Access Grant Channel
• SGCP — Simple Gateway Control Protocol
• ICI — Interexchange Carrier Interface
• VC — Virtual Circuit (ATM)
• CAE — Common Application Environment
• NSDI — National Spatial Data Infrastructure
• RYP — Russian Yellow Pages
• IPR — Intellectual Property Right
• UTP — unshielded twisted pair
• LEC — Liquid Encapsulated Czochralski
• DRTT — Dial Repeating Tie Trunk
• RSL — Request and Status Links
• SMAS — Service Management System
• IMPI — IP (Internet Protocol) Multimedia Private Identity
• PTM — Packet Transport Mode
• OODBMS — Object-Oriented Database Management Systems
• SHR — Self-Healing Ring
• TD-CDMA — Time Division - Code Division Multiple Access
• RZ — Return to Zero
• WGX — Wireless Gateway Switch
• AA — Auto-Answer
• IPCU — iPhone Configuration Utility
• TAE — Terminal Adapter Equipment
• FELB — Far-End Loop Back
• WUP — Wired Up Privacy
• DEO — Digital End Office
• SAMA — Spread Aloha Multiple Access
• TACSIM — Tactical Simulation (Simulator)
• WPOP — Wireless Point-of-Presence
• IPOATM — Internet Protocol over ATM
• EC — Echo Cancelling
• NSN — National Significant Number
• STDM — Statistical Time Division Multiplexing
• VRT — Voltage Reduction Technology

• LRF — Location Registration Function
• LSF — Line Spread Function
• ARAI — Adjunct Route Application Interface
• ATMS — automatic transmission measuring system
• PT — Payload Type (ATM)
• CTIT — College of Telecommunications and Information Technology
• DTS — Digital Terminal Systems
• SACS — Security Access Control System
• VCT — Variable Cam Timing
• SYNC — Synchronization
• CAS — Column Address Strobe
• MOC — Maintenance and Operations Console
• RCR — Research and Development Center for Radio Systems
• ROSE — Remote Operations Service Element
• DISA — Direct Inward Switch Access
• DRTL — Dial Repeating Tie Line
• ESG — Enhanced Service Gateway
• WCRL — Wireless Communications Research Laboratory
• NAM — Numeric Assignment Module
• EF&I — Engineering, Furnishing and Installation
• IPC — Initial Paging Channel
• WTP — Wireless Transaction Protocol
• UVG — Universal Voice Grade
• IRAC — Interdepartment Radio Advisory Committee
• JWP — Joint Working Party
• ICTA — Idaho Cable Telecommunications Association
• CITR — Canadian Institute for Telecommunications Research
• D4 — Digital channel bank, Fourth generation
• FEBE-I — Far End Block Error count - Interleaved data
• OST — Office of Science and Technology
• CAL — Customer Access Line
• VAD — Voice Activity Detection
• BIOS — Basic Input-Output System
• WEDE — Wireless Enterprise Delivery Environment
• ASA — Avaya Site Administration
• ASC — Available Spare Capacity
• UPS — Un-interruptable Power Supply
• 4G — Fourth Generation
• SLIP — Serial Line Internet Protocol
• STE — Syrian Telecommunications Establishment
• RFI — Remote File Inquiry
• WIG — Wireless Internet Gateway
• DFRI — Datacom Reference Frame Input
• SCC — Signal Conversion Circuit
• MRCA — Most Recent Common Ancestor
• AH — Authentication Header
• MO — Magneto-optic
• MERIS — medium-resolution imaging spectrometer
• TFL — Telecom Fiji Limited
• NICAD — Nickel Cadmium

• DBN — Dial-Back Number
• MEAS — Measure
• CFNA — Call Forwarding No Answer
• ADM — Administration, Office of
• SLC — Service Level Contract
• JWG — Joint Working Groupof
• EDT — European Deaf Telephone
• CM — Common Mode
• ACL — Asynchronous Connection-less Link
• LBX — Low Bandwidth X
• DPT — Dial Pulse Terminate
• PMD — Physical Media-Dependent
• CMM — Calls, Minimums, Maximums
• TRAC — Totally Reconfigurable Analog Circuit
• TANE — Telephone Association of New England
• CLIP — Caller Line Identification Presentation
• SM OFC — Single-Mode Optical Fiber Cable
• APTC — Atlantic Provinces Telecommunications Council
• D/I — Drop and Insert
• ESM — electronic support measure
• CARS — Community Antenna Relay Service
• BONDING — Bandwidth On Demand Interoperability Group
• DBF — Digital Beam-Forming
• EGPRS — Enhanced General Packet Radio Service
• MOA — Managed Object Agent
• EKTS — Electronic Key Telephone Set
• UTRAN — UMTS (Universal Mobile Telecommunication System) Terrestrial Radio Access Network
• SASL — Simple Authentication and Security Layer
• OC-96 — Optical Carrier Signal, Level 96
• ILETS — Idaho Law Enforcement Telecommunication System
• ENUM — tElephone NUmber Mapping
• TP-PMD — Twisted Pair Physical Medium Dependent
• VHM — Voice Health Monitor
• BS — Busy Season
• MMC — Minimum Monthly Charge
• MIC — Management Integration Consortium
• PTI — Payload Type Indicator
• AGPS — Assisted Global Positioning System
• DCMES — Dublin Core Metadata Element Set
• UPC — Usage Parameter Control
• EFRC — Enhanced Full Rate Codec
• CDPD — Cellular Digital Packet Data
• QPM — QoS (Quality of Service) Policy Manager
• DE — Discard Eligible
• IMT-2000 — International Mobile Telecommunications 2000
• BTL — Bell Telephone Laboratories, Inc.
• AT — Access Terminal
• VTIR — visible and thermal infrared radiometer
• DMB — Disconnect and Make Busy
• IDSL — ISDN (Integrated Services Digital Network) Digital Subscriber Line

• FRAD — Frame Relay Assembler/Disassembler
• SSCP — System Services Control Point
• TPC — The Phone Company
• TBRL — Terminal Balance Return Loss
• VAB — Vehicle Assembly Building
• BSC — Base Station Controller
• MM — Multimode (fiber optic cable)
• 4WE&M — Four-Wire Ear and Mouth
• CUG — Closed Users Group
• WAGN — West Antarctic GPS (Global Positioning System) Network
• CVSD — Continuous Variable Slope Detection
• STD — Secondary Telecom District
• NSM — Network Status Monitor
• ADC — Advanced Data Control
• MOD — Modulo
• CNE — Certified Novell Engineer
• AFIPS — American Federation of Information Processing Societies
• 888 — Freephone
• HU — Hook Up
• WLNP — Wireless Local Number Portability
• DLCS — Digital Loop Carrier System
• GPBX — Global Private Branch eXchange
• HPPI — High-Performance Parallel Interface
• SDLC — Systems Development Life Cycle
• NECA — National Exchange Carrier Association
• ITOC — Independent Telephone Operating Company
• FICORA — Finnish Communications Regulatory Authority
• CSL — component sublayer
• CTE — Computer Telephony Engine
• NAU — Network Addressable Unit
• EC — Equipment Controller
• CATI — Computer-Assisted Telephone Interviewing
• EC-N — Electrical Carrier (n=a number, e.g., EC-4)
• PSNEXT — Power Sum Near End Cross Talk
• NTE — Network Terminating Equipment
• DUNCE — Dial-Up Networking Connection Enhancement
• CTSO — Cellular Telephone Service Order
• BMAS — Business Management System
• DSX — Digital Signal Cross-Connect
• GRUB — Greedy Reclamation of Unused Bandwidth
• UDC — Universal Digital Channel
• CR — Connection Request
• BTN — Billing Telephone Number
• NETBIOS — Network Basic Input-Output System
• RBOC — Regional Bell Operating Company (Baby Bell)
• CSTA — Computer Supported Telecommunications Applications
• ESDS — Electrostatic Discharge Sensitive
• RFA — Recurrent Fault Analysis
• THL — Trans-Hybrid Loss
• AAV — Alternative Access Vendor

• ZLE — Zero-Latency Enterprise
• TTIL — Team Telecom International Ltd.
• APTG — Asia Pacific Telecom Group
• GTM — Go to Meeting
• RDI-P — Remote Defect Indicator - Path
• LQR — Line Quality Report
• IDEN — Integrated Dispatch Enhanced Network
• TON — IEEE/ACM Transactions On Networking
• ASIC — Application Specific Instruction Code
• WIS — WAN (Wide Area Network) Interface Sublayer
• MHL — Mobile High-definition Link
• FEFA — Far End Failure
• ECTEL — Eastern Caribbean TELecommunications Authority
• UBT — Universal Backend Tester