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Computing & IT >> Telecom Abbreviations

Look through 4999 acronyms and abbreviations related to Telecom:

• IPB — Invision Power Board
• XFMR — Transformer
• DDRS — Dynamic Data Rate Selection
• CBCU — Centralized Broadband Control Unit
• DCE — Data Circuit-terminating Equipment
• DOE — Distributed Object Environment
• DWDM — Dense Wavelength Division Multiplexing
• SYN — Synchronous
• EBITDA — Earnings before Interest, Taxes, Depreciation and Amortization
• ECG — Electrocardiogram
• CT — Computed Tomography
• CSR — Customer Service Representative
• LAN — Local Area Network
• GFSK — Gaussian Frequency Shift Keying
• CONG — Congestion message
• ETA — Estimated Time of Arrival
• APR — Annual Percentage Rate
• IQ — Intelligence Quotient
• CSMA/CA — Carrier Sense Multiple Access/Collision Avoidance
• DAM — Diagnostic Acceptability Measure
• CSMA/CD — Carrier Sense Multiple Access with Collision Detection
• D-H — Diffie-Hellman
• CSMA — Carrier Sense Multiple Access
• ISAR — Inverse Synthetic-Aperture Radar
• DWDM — Dense Wavelength-Division Multiplexing
• CSMA/CD — Carrier sense multiple access / collision detection
• MLS — Microwave Landing System
• ADM — Add-Drop Multiplexer
• YMMV — Your Mileage May Vary
• FTP — File Transfer Protocol
• YTD — Year To Date
• FDIC — Federal Deposit Insurance Corporation
• ISO — In Search Of
• OIC — Oh I See
• MAN — Metropolitan Area Network
• BRDF — Bidirectional Reflectance Distribution Function
• ECU — Electronic Control Unit
• AUP — Acceptable Use Policy
• TNYWR — The Number You Will Receive
• ASAP — As Soon As Possible (pronounced AY-sap)
• LASER — Light Amplification By Stimulated Emission Of Radiation (cf. Maser)
• ROM — Read-Only Memory
• F2F — Face To Face (also Meeting In Person)
• TEMIP — Telecommunications Management Information Platform
• DAC — Discretionary Access Control
• WWW — World Wide Web
• CPE — Customer Premises Equipment
• DSCP — Differentiated Services Control Point
• IRC — Internet Relay Chat
• CUG — Closed User Group

• BVR — Beyond Visual Range
• IT — Information Technology
• DND — Do Not Disturb
• RFQ — Request For Quotation
• CPU — Central Processing Unit
• IAMAI — Internet and Mobile Association of India
• DBORS — Data Base of Records
• WTG — Way To Go
• CCM — counter-countermeasure
• VIP — Very Important Person
• CDR — Critical Design Review
• LED — Light-Emitting Diode
• MBR — Master Boot Record
• CSA — Canadian Space Agency
• CCSDS — Consultative/Consultative Committee for Space Data Systems
• UK — United Kingdom of Great Britain and Northern Ireland
• SAR — Search And Rescue
• ACC — Adaptive Cruise Control
• UDP — User Datagram Protocol (FDDI related)
• ANSI — American National Standards Institute, Inc.
• BTW — By The Way
• XML — Extensible Markup Language
• AFAIK — As Far As I Know
• ISO — International Organization for Standardization
• BIP — Bit-Interleaved Parity
• ACK — ACKnowledgment
• DFD — Displaced Frame Difference
• QC — Quality Control
• AATSR — Advanced Along-Track Scanning Radiometer
• EAP — Employee Assistance Program
• FEMA — Federal Emergency Management Agency
• ESA — European Space Agency
• DBMS — Database Management System
• BUR — Bandwidth Usage Redundancy
• WML — Wireless Markup Language
• PDR — Preliminary Design Review
• IRL — In Real Life
• WDM — Wavelength Division Multiplexing (fiber optics)
• ABI — Application Binary Interface
• LCD — Liquid Crystal Display
• LRJ — Location Reject
• RDF — Resource Description Framework
• OEM — Original Equipment Manufacturer (usually in reference to car parts)
• EDI — Electronic Data Interchange
• FET — Field Effect Transistor
• NOS — Network Operating System
• WWW3 — World Wide Web Consortium
• CD — Compact Disc
• ACE — Access Control Entry
• AC — Alternating Current

• ATM — Automatic Teller Machine
• RWR — Radar Warning Receiver
• CY — Calendar Year
• FAR — Federal Aviation Regulation
• RPI — Retail Price Index
• MB — Megabyte
• MMS — Multimedia Messaging Service
• VM — Voice Mail
• QFSK — Quadrature Frequency Shift Keying
• LRU — Line Replaceable Unit
• DDD — Direct Distance Dial
• CS — Computer Science
• NFS — Network File System
• ACH — Automated Clearing House
• CV — Curriculum Vitae
• PDH — Plesiochronous Digital Hierarchy
• ATTN — Attention
• BBS — Bulletin Board Service
• GSM — Global System for Mobile Communications
• C4I — Command, Control, Communications, Computers, & Intelligence
• IRR — Internal Rate of Return
• ASA — American Standards Association
• EIS — Executive Information System
• STS — Space Transportation System
• ATOM — Any Transport over MPLS (Multi-Protocol Label Switching)
• Y2K — Year 2000
• GATT — General Agreement on Tariffs and Trade (government)
• ALC — Automatic Level Control
• CAUCE — Coalition Against Unsolicited Commercial Email
• AES — Advanced Encryption Standard
• COB — close of business (End of duty day)
• ADD — Addendum
• DSA — Digital Signature Algorithm
• CCB — Change Control Board
• 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.
• SDMA — Space Division Multiple Access
• HTTP — Hypertext Transfer Protocol
• APT — Automatic Picture Transmission
• CGI — Common Gateway Interface
• SMTP — Simple Mail Transfer Protocol
• AAC — Advanced Audio Coding
• PDA — Personal Digital Assistant
• ISP — Internet Service Provider
• EOM — End Of Message
• ATA — Area Transportation Authority
• EFF — Electronic Frontier Foundation
• CCIS — Common Channel Interoffice Signaling
• CEO — Chief Executive Officer
• DMSP — Defense Meteorological Satellite Program (U.S.)
• TQM — Total Quality Management

• GIS — Geographic Information System
• BPM — Beats Per Minute
• ADM — Add/Drop Multiplexer
• AES — Auger Electron Spectroscopy
• ADR — Address
• R&D — Research & Development
• IP — Internet Protocol
• SCSI — Small Computer System Interface
• NMSE — Normalized Mean Square Error
• ACD — Automatic Call Distributor
• POC — Point Of Contact
• LLC — Limited Liability Company
• DDL — Data Definition Language
• EW — Electronic Warfare
• RNC — Radio Network Controller
• ABR — Available Bit Rate
• RF — Radio Frequency
• GPRS — General Packet Radio Service
• WAN — Wide Area Network
• DME — Distance Measuring Equipment
• NIC — Network Interface Card
• QI — Quality Improvement
• CR — Carriage Return
• AC — Access Control
• MST — Mountain Standard Time
• RFP — Request For Proposal
• MOU — Memorandum of Understanding (an MOU between Food & Drug Administratin and a regulatory agency in another country allows mutual recognition of inspections)
• VVX — Voice and Video eXchange
• VAT — Value Added Tax
• SAN — Storage Area Network
• ASME — American Society of Mechanical Engineers
• TCB — Trusted Computing Base
• NPI — New Product Introduction
• AME — Amplitude Modulation Equivalent
• ATM — Asynchronous Transfer Mode
• COR — Carrier Operated Relay
• SP — Service Provider
• UAV — Unmanned Aerial Vehicle
• BECN — Backward Explicit Congestion Notification
• PUHU — Pick Up Hang Up
• PDT — Pacific Daylight Time
• AVHRR — Advanced Very High Resolution Radiometer  
• DTX — Discontinuous Transmission
• THX — Thanks
• RU — Are You?
• VR — Virtual Reality
• RFC — Request For Comment
• APIC — Advanced Programmable Interrupt Controller
• CDR — Call-Detail Record
• S X S — Step-by-Step

• ASR — Airport Surveillance Radar
• DFS — Distributed File System
• MRI — Magnetic Resonance Imaging
• WWW — World Weather Watch
• TCP — Transmission Control Protocol
• DB — Decibel
• RPC — Remote Procedure Call
• SCC — Standards Council of Canada
• CU — Control Unit
• ATF — Advanced Tactical Fighter
• DMX — De-MultipleXer
• AD — Active Directory
• WBS — Work Breakdown Structure
• CBC — cipher block chaining
• TC — Telephone Call
• SRAM — Static Random Access Memory (ess-ram)
• ACFQ — Absence Compensation Fair Queuing
• PCB — printed circuit board
• CAE — Computer-Aided Engineering
• WEP — Wired Equivalent Privacy
• JAXA — Japan Aerospace Exploration Agency
• CB — Call Back
• FAA — Federal Aviation Administration
• IM — Instant Message
• PDF — Portable Document Format (created by Adobe Acrobat)
• 100BASE-T2 — 100 Megabits per Second, Baseband, Two-pair Category 3 UTP cables
• AIS — Automated Information System
• AP — Application Protocol
• DTE — Data Terminal Equipment
• AIR — Account Information and Refill
• EC — European Commission
• IPO — Initial Public Offering
• EST — Eastern Standard Time
• CMI — Computer Managed Instruction
• PPM — parts per million
• CIO — Chief Information Officer
• BS — Base Station
• CPT — Carriage Paid To
• DMTS — Distinguished Member Of Technical Staff
• SD — Standard Deviation
• ARPA — Advanced Research Projects Agency (made early internet)
• CFE — Contractor-Furnished Equipment
• SIG — Special Interest Group
• CIM — Corporate Information Management
• ATM — Adobe Type Manager
• WB — Welcome Back
• AOA — Angle Of Arrival
• TAC — Technical Assistance Center
• BTU — British Thermal Unit
• NMT — Nordic Mobile Telephone

• UPS — Ultraviolet Photoelectron Spectroscopy
• ABC — activity based costing
• GRE — Generic Routing Encapsulation
• PLMN — Public Land Mobile Network
• ATCRBS — Air Traffic Control Radar Beacon System
• SLA — Service Level Agreement
• RM — Resource Management
• API — Application Programming Interface
• EMG — Electromyogram
• I/O — Input/Output
• CAM — Computer-Aided Mapping
• ISO — Infrared Space Observatory
• CIR — Committed Information Rate (Frame Relay)
• Q&A — Question & Answer
• FX — Foreign Exchange
• IMPACT — Integrated Manufacturing Precision Assembly Cellular Technology
• DHCP — Dynamic Host Configuration Protocol
• S-BCCH — Short Message Service Broadcast Control Channel
• DIT — Directory Information Tree
• ISRO — Indian Space Research Organisation
• NIH — Not Invented Here
• MDA — Monochrome Display Adapter
• MIC — Message Integrity Check
• SQA — Software Quality Assurance
• CM — Configuration Management
• UAS — Unavailable Seconds
• VDS — Variable Depth Sonar
• JV — Joint Venture
• AM — Ante Meridian
• MOS — Model Output Statistics
• DOA — dead on arrival
• AM — Amplitude Modulation
• CPM — Critical Path Method
• EBCDIC — Extended Binary Coded Decimal Interchange Code (pronounced Eb-see-dik) (cf. BCD)
• CIS — Commonwealth of Independent States
• DES — Data Encryption Standard
• RDBMS — Relational Database Management System
• SME — Subject Matter Expert
• LCP — Link Control Protocol
• ACL — Access Control List
• BRB — Be right back
• CC — Call Control
• ASK — amplitude shift keying
• QMS — Quality Management System
• MAC — Message Authentication Code
• FCW — Federal Computer Week
• NATO — North Atlantic Treaty Organisation
• MSN — Microsoft Network
• ASTM — American Society for Testing and Materials (Philadelphia, Pennsylvania)
• AT — Access Tandem

• OSS — Operational Support System
• TM — Technical Manual
• SLIP — Serial Line Interface Protocol
• PLD — Programmable Logic Device
• CC — Carbon Copy
• A-KEY — Authentication key
• DSA — Directory System Agent
• ATS — applications technology satellite
• MTBF — Mean Time Before Failure
• PAR — Precision Approach Radar
• MOB — Mobile
• CRL — Certificate Revocation List
• TV — Television
• BBU — Baseband Unit
• MS — Message Store
• ME — Mobile Equipment
• M — Meter
• QOS — Quality of Service
• MS — Mobile Station
• CDS — Cell Directory Service
• DT — DWDM (Dense Wavelength Division Multiplexing) Terminal
• AGP — Accelerated Graphics Port
• UHF — Ultra High Frequency (300-3000 MHz; 1m-10cm)
• VIRUS — Vital Information Resources Under Siege
• BPRZ — Bipolar Return-to-Zero
• SMS — Short Message Service
• TS — Technical Specification
• B-ICI — Broadband Inter-Carrier Interface
• ASCII — American National Standard Code for Information Interchange
• SGML — Standard Generalized Markup Language
• ICT — Information and Communication Technology
• USB — Universal Serial Bus
• YP — Yellow Pages
• EAP — Extensible Authentication Protocol
• X-BAR — Crossbar telephone exchange
• AF — Audio Frequency
• BCC — Blind Carbon Copy
• SDR — Special Drawing Rights
• EGA — Enhanced Graphics Adapter
• FFT — Fast Fourier Transform
• HDLC — High-Level Data Link Control
• IS — Intermediate System
• GPS — Global Positioning System (ex-NAVSTAR)
• MPI — Message Passing Interface
• FC — Fibre Channel
• GUI — Graphical User Interface (goo-ey)
• DLC — Digital Loop Carrier
• VM — Virtual Machine
• RCU — Remote Control Unit
• COMJAM — Communications Jamming

• IW — Information Warfare
• PAL — Programmable Array Logic
• TNSTAAFL — There's No Such Thing As A Free Lunch
• TPDU — Transport Protocol Data Unit
• LLC — Logical Link Control
• TBD — To Be Decided
• AML — Amplitude Modulated Link
• AT — Advanced Technology
• JIS — Japanese Industrial Standard
• LCN — Logical Channel Number
• CS — Cable Select
• UAN — Universal Access Number
• EPA — Environmental Protection Agency (US)
• PO — Purchase Order
• RDY — Ready
• DARPA — Defense Advanced Research Projects Agency (US)
• Z — Zero
• RACON — Radar Beacon
• ATC — Air traffic control
• ICMP — Internet Control Message Protocol
• SEM — Space Environment Monitor
• ADSL — Asymmetric Digital Subscriber Line
• HW — Hardware
• RCC — Rescue Coordination Center
• RAD — Rapid Application Development
• ADPE — Automatic Data Processing Equipment
• DNS — Domain Name System
• MF — Medium Frequency
• F — Fellow
• X-ON — Transmitter On
• CERT — Computer Emergency Response Team
• SAS — Statistical Analysis System
• MS — Management System
• CBDS — Connectionless Broadband Data Service
• SA — Scientific American
• OMG — Object Management Group
• SEC — Software Engineering Center
• AE — Application Entity
• PM — Preventive Maintenance
• CIM — Common Information Model
• EDS — Electronic Data Systems Corporation
• DIS — Distributed Interactive Simulation
• VOP — Voice Over Packet
• ISS — International Space Station
• CLNP — ConnectionLess-mode Network Protocol
• SSM — Source-Specific Multicast
• ACM — Association for Computing Machinery
• DPC — Destination Point Code
• RIP — Routing Information Protocol
• IDT — Integrated Digital Terminal

• AGC — Automatic Gain Control
• ECN — Explicit Congestion Notification
• DLR — Design Layout Record
• LSR — Local Service Request
• E — Energy
• EU — European Union (1994; formerly referred to as the EEC or EC)
• NI — Network Interface
• TTYL — Talk To You Later (Internet Slang)
• X-OFF — Transmitter Off
• ARPU — Average Revenue Per User
• ADT — Abstract Data Type
• LEO — Low Earth Orbit (satellite communications)
• FXO — Foreign Exchange Office
• WS — Workstation
• B3ZS — bipolar 3-zero substitution
• CIC — Circuit Identification Code
• PNG — Portable Network Graphics (graphic file standard/extension)
• LF — Low Frequency
• MC — Message Center
• MHS — Microwave Humidity Sounder
• VB — Visual Basic
• DC — Direct Current
• URL — Universal Resource Locator
• CUL — See You Later
• EAS — Extended Area Service
• ASR — Access Service Request
• VHF — Very High Frequency
• FA — Functional Area
• AR — Access Rate
• UR — Your
• TLS — Transport Layer Security
• ARPANET — ARPA Network
• TEC — Total Electron Content
• BSD — Berkeley Software Distribution
• NSF — National Sanitation Foundation
• CABS — Carrier Access Billing System
• SDD — Software Design Document
• CAC — Carrier Access Code
• ABET — Accreditation Board for Engineering and Technology, Inc.
• NSA — National Security Agency
• SPI — Service Provider Interface
• CO — Certificate of Origin
• H323 — ANSI standard for format over IP
• OTN — Optical Transport Network
• RFI — Radio Frequency Interference
• WMAN — Wireless Metropolitan Area Network
• EVP — Executive Vice President
• DCE — Distributed Computing Environment
• SWAG — Scientific Wild Ass Guess
• SM — Senior Member

• AS — Autonomous System
• IPX — Internetwork Packet Exchange
• RTS — Request To Send
• RT — Remote Terminal
• RFS — Request For Service
• CHAP — Challenge Handshake Authentication Protocol (ATM)
• SEI — Software Engineering Institute
• VOD — Video On Demand
• AE — Account Executive
• CEV — Controlled Environment Vault
• SCP — Service Control Point
• RAM — random-access memory
• IP — Intelligent Peripheral
• DOM — Document Object Model
• OSPF — Open Shortest Path First (ATM)
• CW — Continuous Wave
• DS — Digital Signal
• PE — Polyethylene
• SVC — Scalable Video Coding
• DQPSK — Differential Quadrature Phase-Shift Keying
• WACN ID — Wide Area Communications Network IDentifier
• IVR — Interactive Voice Response (telephone technology)
• OM — Old Man
• SIL — Speech Interference Level
• HSDPA — High-Speed Downlink Packet Access
• ACE — Advanced Computing Environment
• OBO — Or Best Offer
• MSE — Mobile Subscriber Equipment
• AU — Audio Unit
• BBS — Bulletin Board System
• D-NBAP — Dedicated Node B Application Part
• NPV — Net Present Value {economics}
• BCD — Binary-Coded Decimal
• ADF — Automatic Direction Finder
• UA — User Agent
• ZIP — Zone Information Protocol
• YGWYPF — You Get What You Pay For
• TOS — Type Of Service
• ATSR — Along-Track Scanning Radiometer
• CGI — Computer-Generated Imagery
• ZDBOP — Ziff-Davis Benchmark Operation
• AFP — AppleTalk Filing Protocol
• TBD — To Be Determined
• BACP — Bandwidth Allocation Control Protocol
• TB — Terabyte
• AMI — Alternate Mark Inversion
• C-NBAP — Common Node B Application Part
• HF — High Frequency
• XA-FR — Exchange Access Frame Relay
• DSSS — Direct Sequence Spread Spectrum

• ECT — Explicit Call Transfer
• JSC — Johnson Space Center (Houston, TX)
• CCTV — Closed-circuit television
• MS — Millisecond
• PDN — Public Data Network
• IETF — Internet Engineering Task Force
• AFC — Automatic Frequency Control
• MP — Multilink Protocol
• URI — Uniform Resource Identifier
• PWD — Password
• NYSE — New York Stock Exchange
• MD — Mediation Device
• PRF — Pulse Repetition Frequency
• NTFS — New Technology File System
• DRAM — Dynamic Random Access Memory (dee-ram) (computing)
• IS — International Standard
• MSU — Microwave Sounding Unit
• WPS — Wireless Priority Service
• APC — American Power Conversion
• COO — Cost of Ownership
• PVT — Private
• VTC — Video Teleconference
• DSC — Differential Scanning Calorimetry
• PECVD — Plasma-Enhanced Chemical Vapor Deposition
• IN — Intelligent Network
• DA — Destination Address
• BT — British Telecommunications
• P&L — Profit and Loss statement
• COM — Component Object Model
• NOTAM — Notice to Airmen
• QAM — quadrature amplitude modulation
• AMT — Amount
• CU — See You
• ACK — Acknowledge (telecommunications; Cf. NAK)
• BRA — Basic Rate Access
• NAS — Network Access Server
• TN — Telephone Number
• CA — Certificate Authority
• WB — Write Back
• RDP — Radar Data Processing
• UL — Uplink
• ZIP — Zone Improvement Plan
• ERT — Emergency Response Team
• DCP — Design Change Package
• CAN — Campus Area Network
• CIA — Central Intelligence Agency
• NIC — Network Information Center
• CT — Computer Telephony
• NIS — Network Information Service
• RCV — Receive

• HSD — High Speed Data
• SCTP — Stream Control Transmission Protocol
• LF — Line Feed
• CATV — Community Antenna Television
• MSR — Microwave Scanning Radiometer
• ARP — Address Resolution Protocol (ATM)
• ISI — Inter-Symbol Interference
• STI — Speech Transmission Index
• M — Management
• PMA — Physical Medium Attachment
• NESDIS — National Environmental Satellite, Data, and Information Service
• STK — Satellite Tool Kit
• STP — Spanning Tree Protocol
• BT — BlueTooth
• WG — Working Group
• OMS — Optical Multiplex Section
• EEPROM — Electrically Erasable Programmable Read-Only Memory
• UAX 14 — Unit Automatic eXchange type 14
• VLL — Virtual Leased Line
• PT — Project Team
• DTR — Data Terminal Ready
• PSTN — Public Switched Telephone Network
• RH — Relative Humidity
• FR — Frame Relay
• SVC — Switched Virtual Connection
• FCA — Free Carrier
• TE — Traffic Engineering
• ACR — Attenuation Crosstalk Ratio
• AMI — Advanced Metering Infrastructure
• OSI — Open Systems Interconnection (iso Standard)
• RA — Risk Analysis
• NEC — National Electrical Code
• E-LEAD — Ear Lead
• DUP — Duplicate
• MCU — Multipoint Control Unit
• ISA — Industry Standard Architecture
• PGP — Pretty Good Privacy (encryption)
• EEC — European Economic Community (predecessor of the European Union|EU)
• NA — Not Applicable
• SBC — Session Border Controller
• PCI — Peripheral Component Interconnect
• CRT — Cathode Ray Tube (type of TV)
• DAP — Directory Access Protocol
• MDA — Model Driven Architecture
• AM — Activity Manager
• LZ — Landing Zone
• BER — Bit-Error Rate
• SAN — System Area Network
• GDS — Global Distribution System
• SVD — Singular Value Decomposition

• TOP — Technical Office Protocol
• AXE 10 — Series of electronic telephone exchanges from L.M. Ericsson
• TRM — Technical Reference Model
• ADEOS — ADvanced Earth Observing Satellite (Japan)
• DMARC — Demarcation point
• SCN — Switched Circuit Network
• FIFO — First In, First Out
• DQE — Detective Quantum Efficiency
• CTS — Clear To Send
• DID — Digital Information Display
• FE — Far End
• RM — Regional Manager
• CBT — Computer Based Training
• IIS — Internet Information Services
• MIS — Management Information System (OSHA)
• EAC — Engineering Accreditation Commission
• RFI — Request For Information. Sales department shorthand. Special priority when use in conjunction with RFN (see below).
• AFS — Andrew File System
• OPC — Originating Point Code
• CAB — Conformity Assessment Body
• NMS — Network Management System
• NCS — National Communications System
• GB — Gigabyte
• SPADATS — Space Detection And Tracking System
• RFO — Reason For Outage
• LD — Long Distance
• NLMS — Normalized Least Mean Square
• BIS — Bureau of Indian Standards
• TCP/IP — transmission control protocol/internet protocol
• STM — Short Term Memory
• CAD — Computer Aided Designer
• ES — Errored Second
• Y — Yes
• ARC — Army Reuse Center
• BIP — Band Interleaved by Pixel
• MOL — Manned Orbiting Laboratory
• QA — Center for Quality Assurance in International Education
• DOD — United States Department of Defense
• CSAT — Customer Satisfaction
• PSD — Phase-Sensitive Detector
• W3C — World Wide Web Consortium
• TG — Task Group
• PAN — Personal Area Network
• OCR — Optical Character Recognition
• TWT — Traveling Wave Tube
• VOL — Volume
• BS — Beam Splitter
• TLC — The Learning Channel
• FAQ — Frequently Asked Questions (sometimes Pronounced Fak)
• AIS — Alarm Indication Signal

• LP — Low Pressure
• MLS — Multiple Listing Service
• OAS — Organization of American States
• VAC — Vacant
• AMLCD — Active Matrix Liquid Crystal Display
• DX — Duplex
• OC — Optical Carrier
• MVS — Multiple Virtual Storage
• CAM — computer aided manufacturing
• MRC — Monthly Recurring Charge
• BST — British Summer Time
• CDMA — Code Division Multiple Access (voice/data transmission)
• ASR — Automatic Speech Recognition
• PDS — Protected Distribution System
• LPC — Linear Predictive Coding
• CNM — Customer Network Management
• FITS — Flexible Image Transport System
• COO — Chief Operation Officer
• EPR — Electron Paramagnetic Resonance
• CS — Convergence Sublayer (ATM)
• USD — United States Dollar
• JPL — Jet Propulsion Laboratory (California Institute of Technology) (NASA)
• DVP — Digital Voice Privacy
• NNM — Network Node Manager
• P — Predicted
• SPC — Stored Program Control
• CF — Compact Flash
• MOD — Modify
• ESS — Electronic Switching System
• COQ — Cost Of Quality
• AFSK — Audio Frequency Shift Keying
• DEC — Decimal
• Y — Yttrium
• FUP — Fair Use Policy
• IS — Information System
• DOJ — Department of Justice (US)
• ITSEC — Information Technology Security Evaluation Criteria
• AEW — Airborne Early Warning
• PPB — parts per billion (109)
• CAV — Constant Angular Velocity
• DSS — Decision Support System
• RSRQ — Reference Signal Received Quality
• CB — Common Battery
• ISDN — Integrated Services Digital Network
• FCP — Fibre Channel Protocol
• PGA — Programmable Gate Array
• CG — Coast Guard
• DCN — Disconnect
• MCSD — Microsoft Certified Solution Developer
• TE — Test Equipment

• FDDI — Fiber Distributed Data Interface
• TSR — Telecommunications Service Request
• LEN — Line Equipment Number
• ECAC — European Civil Aviation Conference
• METRO — Metropolitan
• RT — Response Time
• ARG — Argument
• PS — Product Specification
• AAS — Adaptive Antenna System
• EX — Exercise
• DC — Display Controller
• BG — Background
• I.LINK — IEEE 1394, High Performance Serial Bus, implementation
• PD — Public Domain
• SAS — Special Access Surcharge
• AMD — Advanced Micro Devices, Inc. (producer of computer chips)
• VT — Vacuum Tube
• ATA — Analog Telephone Adapter
• OLAP — Online Analytical Processing
• DC — Disconnected
• LEP — Large Electron Positron
• ETS — European Telecommunication Standard
• DDS — Digital Data Service
• DMA — direct memory access (computer term)
• PSK — phase-shift keying
• VC — Virtual Channel
• STP — Signal Transfer Point
• TI — Time Interval
• EIP — Equipment installation procedure
• RAID — Redundant Array of Inexpensive Disks
• PDS — Planetary Data System
• AOI — Area Of Interest
• SBC — Southwestern Bell Corporation
• A — Anode
• LPE — Liquid Phase Epitaxy
• SL — Single Line
• ADC — Analog-Digital Converter
• CATV — Cable Television
• DCS — Digital Cross-connect System
• PDU — Protocol data unit (such as segment, packet, frame, etc.)
• ACT — Activity
• APM — Advanced Power Management
• SQL — Structured Query Language
• DAL — Dedicated Access Line
• FDL — Facility Data Link
• CAA — Civil Aviation Authority
• BSOD — Blue Screen Of Death
• IEC — International Electrotechnical Commission
• T-CARRIER — Trunk Carrier
• WYSIWYG — What You See Is What You Get (pronounced Wizzy-wig. See Entry For Derived Acronyms)

• MHS — Message Handling System (electronic)
• SHF — Super High Frequency
• EDVAC — Electronic Discrete Variable Automatic Computer
• AEC — Architecture, Engineering, Construction
• SNMP — Simple Network Management Protocol (ATM)
• UP — User Profile
• PIN — Personal Identification Number
• PE — Probable Error
• SF — Single Frequency
• VPN — Virtual Private Network (ATM)
• ENIAC — Electronic Numerical Integrator And Computer
• DUC — Digital Up-Converter
• PTA — Pakistan Telecommunication Authority
• CER — Cell Error Ratio
• ECP — Encryption Control Protocol
• LU — Logical Unit
• OS — Operating System
• MCD — Magnetic Circular Dichroism
• SD — Software Development
• FE — Finite Element
• EPABX — Electronic Private Automatic Branch Exchange
• ARA — Apple Remote Access
• ASQC — American Society for Quality Control's
• YL — Young Lady
• CAM — Content Addressable Memory
• FCS — Frame check sequence (Ethernet)
• DL — Digital Library
• AAAS — American Association for the Advancement of Science
• ATN — Aeronautical Telecommunication Network
• CIS — CompuServe Information Service
• AS — Access System
• BOC — Bell Operating Company
• RJ-25 — Registered Jack type 25 (6-wire connector)
• DSTE — Digital Subscriber Terminal Equipment
• AIN — Advanced Intelligent Network
• ECO — Engineering Change Order
• CMT — Cadmium Mercury Telluride
• MCA — Micro Channel Architecture
• KISS — Keep It Simple Stupid
• CBP — Coded Block Pattern
• SAR — Specific Absorption Rate
• BERT — Bit Error Rate Tester (telecommunication)
• SLP — Service Location Protocol
• DCS — Digital Cellular System
• 9 — Nine
• SML — Service Management Layer
• FAA — Federal Aviation Agency
• SOHO — Small Office Home Office
• AADC — Automated Area Distribution Center
• RAEX — Roaming Agreement EXchange

• BNSC — British National Space Centre
• BYOD — Bring Your Own Device
• DCOM — Distributed Component Object Model
• SNR — Signal-to-Noise Ratio
• SAIC — Science Applications International Corporation
• 3G — Third Generation mobile phone network
• TE — Terminal Equipment
• OTS — Optical Transmission Section
• PUB — Publication (file name extension)
• DAHDI — Digium/Asterisk Hardware Device Interface
• AUD — Audit
• CU — Channel Unit
• BR — Branch
• EOT — End Of Transmission
• PC — Personal computer (host)
• CO — Central Office
• NA — Network Adapter
• LT — Less Than
• E — Echo
• CCTA — Central Computer and Telecommunications Agency
• SOW — Statement Of Work
• AAF — Advanced Authoring Format
• BPR — Business Process Re-engineering
• DBS — Direct Broadcast Satellite
• ROSAT — Roentgen Satellite
• PG — Page
• DCS — Digital Cross-Connect
• ROFL — Rolling on the floor laughing
• SSL — Secure Socket Layer
• TSB — Telecommunication Standardization Bureau
• AT&T — American Telephone & Telegraph
• RT — Radiotelephone
• NIC — Network Interface Controller
• TNX — Thanks
• PERT — Program Evaluation and Review Technique
• CDC — Connected Device Configuration
• DOS — Disk Operating System
• ADN — Advanced Digital Network
• IV — Initialization Vector
• EFS — Encrypting File System
• DASD — Direct Access Storage Device
• MTTR — Mean Time To Repair
• ELINT — Electronic Intelligence Satellite
• JVM — Java Virtual Machine
• Q — Quadrature
• 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.
• IRS — U.S. Internal Revenue Service
• TMS — Time Management System
• TO — Technical Order
• RTN — Regional Telecommunication Network

• RFD — Request For Discussion
• EMEA — Europe, Middle East and Africa
• PIC — Peripheral Interface Controller
• NOAA — National Oceanic and Atmospheric Administration (US)
• LLU — Local Loop Unbundling
• BS — Broadcast Satellite
• RSVD — Reserved
• CTD — Cumulative Trauma Disorder
• LED — law enforcement desk; light emitting diode
• M-CSI — Mobility management CAMEL (Customized Applications for Mobile network Enhanced Logic) Subscription Information
• OAM&P — Operations, Administration, Maintenance & Provisioning
• RPM — Revolutions Per Minute, (Rotations Per Minute)
• AMHS — Automated Message Handling System
• TLK — Talk
• BGP — Border Gateway Protocol (routing protocol)
• ELF — Extremely Low Frequency
• C — Cost
• ASIC — application-specific integration circuit
• AAAI — American Association for Artificial Intelligence's
• IT — Integration Test
• BSS — Basic Service Set
• BPS — bits per second
• ACE — Adaptive Communication Environment
• BS — Backing Store
• VOA — Voice Of America
• SPM — Scanning Probe Microscope
• ITU — International Telecommunication Union
• BBM — Blackberry Messenger
• SMR — Specialized Mobile Radio
• FRS — Family Radio Service
• SZ — Seizure
• 1000BASE-T — 1000 Megabits per Second, Baseband, Twisted Pair
• GOS — Grade Of Service
• ADL — Advanced Distributed Learning
• SA — Source Address
• CRM — Customer Relationship Management
• PDC — Personal Digital Cellular
• TCR — Temperature Coefficient of Resistance
• VLF — Very Low Frequency
• T-IC — T-interConnect
• JAN — Joint Army-Navy
• WWAN — Wireless Wide Area Network
• RARP — Reverse Address Resolution Protocol
• O&M — Operation and Maintenance
• HTTPS — HyperText Transfer Protocol Secure
• DSL — Digital Subscriber Line
• ECPA — Electronic Communications Privacy Act 1986
• VAZO — Violating All-Zero Octet
• SIL — Silence
• EMR — Electromagnetic Radiation

• NRC — National Research Council (Canada)
• TCM — Trellis-Coded Modulation
• TAD — Telephone Answering Device
• NNTP — Network News Transfer Protocol
• MAI — Multiple Access Interference
• SOAP — Simple Object Access Protocol
• SIM — Subscriber Identity Module
• TCSEC — Trusted Computer System Evaluation Criteria
• ASARS — Advanced Synthetic Aperture Radar System
• MTSO — Mobile Telephone Switching Office
• PRI — Primary Rate Interface (ISDN)
• EFIS — Electronic Flight Information System
• PMP — Project Management Professional
• VT — Virtual Terminal
• FCA — Free Carrier Absorption
• POP — Point Of Presence (Internet)
• EM — Electromigration
• ATC — Advanced Technology Center
• PC — Peripheral Controller
• DPL — Digital Power Line
• CRC — Contrôle de Redondance Cyclique (French: Cyclic Redundancy Check)
• DTMF — Dual-Tone MultiFrequency
• PPP — Point-to-Point Protocol
• BPDU — Bridge Protocol Data Unit
• DSN — Deep Space Network - network of large antennas and communication facilities.
• DDE — Dynamic Data Exchange (in software parlance)
• O/S — Operating System
• CDT — Central Daylight Time
• GSA — U.S. General Services Administration
• NIST — National Institute of Standards and Technology
• DDL — Digital Data Link
• SOGA — Share of Gross Adds
• CFA — Carrier Facility Assignment
• RACF — Resource Access Control Facility
• FIPS — Federal Information Processing Standard
• S/D — Source/Drain
• ROI — Return on Investment
• CGSA — Cellular Geographic Service Area
• ESTEC — European Space Research and Technology Centre
• SATAN — Security Administrator Tool for Analyzing Networks
• LDAP — Lightweight Directory Access Protocol (pronounced Ell-dap)
• BOD — Bandwidth on Demand
• WE — Western Electric
• DL — Data Link
• MAC — Media Access Control
• SRM — Scalable Reliable Multicast
• FTTH — Fiber To The Home
• JIT — Just in time
• ADCCP — Advanced Data Communications Control Procedures
• SN — Service Number

• HZ — cycles per second (hertz)
• SRS — Software Requirements Specifications
• OSCAR — Orbiting Satellite Carrying Amateur Radio
• CQA — Certified Quality Auditor
• SQ — Service Quality
• ITP — Interactive Telecommunications Program
• STD — Subscriber Trunk Dialing
• BSS — Base Station Subsystem
• MIPS — Millions of Instructions Per Second
• ISM — Industrial, Scientific and Medical
• KBYTE — Kilobyte (103)
• PVD — Physical Vapor Deposition
• MV — Motion Vector
• SLV — Satellite-Launch Vehicle
• DNIS — Dialed Number Identification Service
• AQL — Acceptable Quality Level
• QPSK — aeronautical quadrature phase shift keying
• PDT — Portable Data Terminal
• NMR — Nuclear Magnetic Resonance
• WTLS — Wireless Transport Layer Security
• WDN — Wireless Developer Network
• SLIC — Subscriber Line Interface Circuit
• COM — Comedy Central
• SD — Speed Dial
• SPX — Sequenced Packet Exchange
• CAPS — Call Attempts Per Second
• RDS — Rate Determining Step
• CAP — Capability
• CS — Central Station
• DID — direct inward dial
• FRS — Frame Relay Service
• OSTP — Office of Science and Technology Policy
• MME — Mobility Management Entity
• FXS — Foreign Exchange Subscriber
• SB — Switchboard
• AP — Action Point
• CPC — Continous Packet Compression
• TAM — Telephone Answering Machine
• CB — Citizens' Band
• ETF — Early Termination Fee
• CLI — Command line Interface (Cabletron)
• BAN — Base Area Network
• CTU — Central Terminal Unit
• AC — Area Code
• ASP — Application Service Provider
• DMI — Distributed Management Interface
• CI — Common Interface
• MIB — Management Information Base (ATM)
• FR PVC — Frame Relay Permanent Virtual Connection
• CBWFQ — Class Based Weighted Fair Queueing

• MLP — Mobile Location Protocol
• SIC — Standard Industrial Classification (Code)
• MX — Mixer
• MTU — Maximum Transmission Unit
• TSE — Toronto Stock Exchange
• ARIN — American Registry for Internet Numbers
• ACLR — Adjacent Channel Leakage Ratio
• RTU — Remote Terminal Unit
• TOS — Temporarily Out of Service
• RP — Reference Point
• PCM — Pulse-Code Modulation
• CPN — Cisco Powered Network
• LD — Laser Diode
• WLAN — Wireless Local Area Network
• EEA — European Economic Area
• ASI — Asynchronous Serial Interface
• EECM — End-to-End Call Manager
• VG — Voice Grade
• ERP — Enterprise Resource Planning
• FAS — Frame Alignment Signal
• MDM — Mobile Device Management
• CSC — Common Signaling Channel
• COPS — Common Open Policy Service
• DM — Domain Model
• NES — Network Encryption System
• SCADA — Supervisory Control And Data Aquisition
• AFM — Atomic Force Microscopy
• EEG — Electro-EncephaloGram
• CIS — Computer and Information Science
• C — Collector
• DLL — Dynamic Link Library (computer file)
• NPA — Numbering Plan Area
• NTIA — National Telecommunications and Information Administration
• DII — Dynamic Invocation Interface
• DTN — Data Transfer Network
• DSP — Digital Signal Processor
• DID — data item description
• CDA — Command and Data Acquisition
• VC-ATOD — Virtual Clearinghouse on Alcohol, Tobacco and Other Drugs
• EMC — Electromagnetic Compatibility
• SABGW — System Architecture Evolution Gateway
• PM — post meridian
• DCN — Design Change Notification
• SAE — Society of Automotive Engineers
• SSRC — Synchronization Source
• CRO — Central Records Office
• TCO — Total Cost of Ownership
• PKI — Public Key Infrastructure (cryptography)
• GMRS — General Mobile Radio Service
• SPIN — Service Provider Identification Number

• ASDE — Airport Surface Detection Equipment
• DIBL — Drain-induced Barrier Lowering
• SG — Signaling Gateway (IETF)
• BSS — Base Station System
• ACO — Additional Call Offering
• ER — Extended Range
• NTP — Network Time Protocol
• EDD — Envelope Delay Distortion
• CT — Computer Terminal
• ES — Emergency Service
• BJT — Bipolar Junction Transistor
• SIA — Securities Industry Association
• E — Electra
• AYT — Are You There
• SM — Service Module
• NCSC — National Computer Security Center (NSA)
• LQR — Linear Quadratic Regulator
• MIDP — Mobile Information Device Profile
• EAI — Enterprise Application Integration
• BTC — Botswana Telecommunications Corporation
• CS-PDU — Convergence Sublayer - Protocol Data Unit
• ABN — Abnormal
• P — Priority
• EDP — Electronic Data Processing Plc (London Stock Exchange [LSE])
• ISAS — Institute of Space and Astronautical Sciences (Japan)
• V — Variable
• DC — Device Control
• B3G — Beyond Third Generation
• BMS — Business Management System
• POTS — Plain Old Telephone Service (FCW)
• TDM — Time Division Multiplexer
• SCU — System Control Unit
• NBS — National Bureau of Standards (US)
• DRM — Digital Rights Management
• RTC — Real-Time Control
• VOIP — Voice Over IP (Internet Protocol)
• SDU — Signal Distribution Unit
• CIP — Carrier Identification Parameter
• PSS — Performance Support System
• 10BASE-T — 10 Megabits per second, Baseband, Twisted pair
• RDF — Radio Direction Finder
• MH — Message Handler
• ACP — Access Control Point
• CGA — Carrier Group Alarm
• WAYP — White and Yellow Pages
• ODBC — Open Database Connectivity
• CP — Call Processing
• MDF — Main Distribution Frame
• OLE — Object Linking and Embedding (Microsoft communication protocol)
• E&M — ear and mouth (special signaling leads)

• ACF — Access Control Field
• CMM — Capability Maturity Model
• CGA — Color Graphics Adapter
• BIU — Bus Interface Unit
• XPS — X-Ray Photoelectron Spectroscopy
• TUR — Trunk Utilization Report
• FCC — Federal Communications Commission (US)
• BCH — Binary Coded Hexadecimal
• TTY — Teletype Telex Machine
• SML/SMS — Service Management Layer/Service Management Service
• ASD — Alternative Service Delivery
• IRC — International Record Carrier
• FTTB — Fiber To The Building
• WAR — Weekly Activity Report
• IOC — Inter-Office Channel
• FLM — First Line Maintenance
• SSM — Synchronization Status Message
• PABX — private automatic branch exchange (telephone)
• TELECOMMUTE — Telecommuting
• 100BASE-T4 — 100 Megabits per Second, Baseband, Four-pair Category 3 UTP cables
• PU — Physical Unit (IBM)
• BIS — Business Information System
• AWT — Agence Wallonne des Télécommunications
• CE — Channel Element
• ECMA — European Computer Manufacturer's Association
• SDLC — Synchronous Data Link Control
• AIF — Audio Interchange Format
• CMP — Connection Management Protocol
• FASB — Financial Accounting Standards Board
• PAP — Password Authentication Protocol (ATM)
• AT&T — American Telephone and Telegraph (U.S. company, also known as "Ma Bell")
• PBX — Private Branch eXchange (company phone system)
• ADN — Abbreviated Dialing Number
• NEMA — National Electric Manufacturer's Association
• EU — End User
• ST — Such That
• TRS — Telecommunications Relay Service
• LASA — Large Aperture Seismic Array
• IMP — Interface Message Processor
• TOA — Time Of Arrival
• ARQ — Automatic Repeat-reQuest
• DTI — Department of Trade and Industry (UK)
• SSM — Spread Spectrum Modulation
• KHZ — kilohertz (1000 cycles per second)
• DAP — Distributed Array Processor
• CST — Central Standard Time (UTC-6 Hours)
• OSP — Outside Plant
• AIT — Automatic Identification Technology
• BRI — Basic Rate Interface
• AN — Access Node

• SN — Stock Number
• DHD — Dial Home Device
• IPM — Inches Per Minute
• UTC — Coordinated Universal Time
• T — Temperature
• ARINC — Aeronautical Radio Incorporated
• IANA — Internet Assigned Numbers Authority
• CFD — Call For Discussion
• SBU — Strategic Business Units
• PIM — Personal Information Manager
• REPT — Report
• EHF — Extremely High Frequency
• TAX — Trunk Automatic Exchange
• PM — Project Manager
• CMS — Content Management System
• IAT — Integrated Access Terminal
• CMD — Command
• RSN — Real Soon Now [which may be a long time coming]
• STA — State
• SIT — Static Induction Transistor
• GI — Graded-Index
• DGPT — Directorate General of Posts and Telecommunications
• TOVS — TIROS Operational Vertical Sounder
• IRS — Inertial Reference System
• AWG — American Wire Gauge
• PVC — Permanent Virtual Connection
• SPA — Software Publishers Association
• KAK — Key-Auto-Key
• PMT — Program Management Team
• PDN — Packet Data Network
• CVR — Crystal Video Receiver
• BOSS — Binary Object Storage System
• ADC — Administration Center
• FAX — Facsimile
• FOSE — Federal Office Systems Exposition
• LS — Loop Start
• ET — Electronic Transmission
• SAF — System Access Fee
• VGA — Video Graphics Array
• OC-9 — Optical Carrier Signal, Level 9
• NTIS — National Technical Information Service Technology Administration
• CIFS — Common Internet File System
• CFO — Communication Filing Officer
• DDU — Disk Drive Unit
• MA — Maintenance Action
• RSS — Really Simple Syndication
• CCSD — command communications service designator; control communications service designator
• SW — South West
• ESF — Edge Spread Function
• EPR — Ethylene-Propylene Rubber

• ADT — American District Telegraph Company
• MTS — Message Transfer System
• PCI — Personal Computer Interface
• BA — Behaviour Aggregate
• LNP — Local Number Portability
• NF — Noise Factor
• DM — Differential Mode
• OTDOA — Observed Time Difference of Arrival
• 2W — 2-Wire
• DPL — Digital Private-Line
• RAN — Radio Access Network
• FSK — Frequency-Shift Keying
• SDH — Synchronous Digital Hierarchy (ATM)
• AOL — America on line
• WPAN — Wireless Personal Area Network
• RXQUAL — Received Signal Quality
• DL — Definition List
• BIOS — Basic Input Output System
• INSAT — Indian National Satellite
• MP — Modulation Parameter
• ACTV — Active
• EIGRP — Enhanced Interior Gateway Routing Protocol
• PVC — Permanent Virtual Circuit (ATM)
• IEC — Interexchange Carrier
• CMRS — Commercial Mobile Radio Service
• COO — Cell of Origin
• B2C — Business-to-Consumer
• DTAP — Direct Transfer Application Process
• ORB — Object Request Broker
• MPI — Minimum Picture Interval
• SWAP — Shared Wireless Access Protocol
• YYP — Yahoo Yellow Pages
• AP — access point
• EGP — Exterior Gateway Protocol
• APS — Automatic Protection Switching (SONET/SDH)
• 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
• HEHO — Head End Hop Off
• ILEC — Incumbent Local Exchange Carrier
• OC-18 — Optical Carrier Signal, Level 18
• CP — Change Proposal
• AOS — Alternate Operator Service
• CFD — computational fluid dynamics
• CONUS — Contiguous United States
• UI — User Interface
• TL1 — Transaction Language 1
• 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)
• C4 — Command, Control, Communications, and Computers
• ROTFL — Roll On The Floor Laughing
• MIT — Massachusetts Institute of Technology (U.S.)
• DCA — Dynamic Channel Assignment

• ESP — Encapsulating Security Payload
• TSO — Telecommunications Service Order
• BOFH — Bastard Operator From Hell
• ALOC — Average Length Of Call
• PPARC — Particle Physics and Astronomy Research Council
• SDK — Software Development Kit (Microsoft)
• DCE — Data Communication Equipment
• CRTS — Cellular Radio Telecommunications Service
• UN — United Narions
• CND — Calling Number Display
• HVAC — Heating, Ventilation, and Air Conditioning
• HSS — Home Subscriber Server
• PM — Phase Modulation
• CAM — Common Access Method
• SAR — synthetic aperture radar (satellite)
• KB — Kilobyte: One thousand and twenty-four bytes kbps kilo bit per second
• CORBA — Common Object Request Broker Architecture
• LDN — Local Directory Number
• AIFF — Audio Interchange File Format
• SHA — Secure Hash Algorithm
• VSAT — Very Small Aperture Terminal (satellite service)
• CHF — Swiss Franc
• DNIC — Data Network Identification Code
• MA — Message Analysis
• WIPO — World Intellectual Property Organization
• MSW — Most Significant Word
• IPS — InPlane Switching
• JPEG — Joint Photographic Experts Group (24-bit image storage format)
• RAU — Remote Access Unit
• RSVP — Resource Reservation Protocol (Internet)
• ADT — Atlantic Daylight Time (UTC-3 Hours)
• SDM — Service Delivery Management
• DSLAM — Digital Subscriber Line Access Multiplexer (Module)
• PP — Polypropylene
• ICL — Inserted Connection Loss
• ACAP — Application Configuration Access Protocol
• EDC — Electronic Dispersion Compensator
• AAV — Accountholder Authentication Value
• RMI — Remote Method Invocation
• TDOA — Time Difference Of Arrival
• ILD — International Long Distance
• CFV — Call For Vote(s)
• TCIC — Trunk Circuit Identification Code
• IRS — Interface Requirements Specification
• CIP — Channel Interface Processor
• FOD — Fax on Demand
• ISOC — Internet Society
• DMS — Data Management System
• FDTD — Finite Difference Time Domain
• CSPDN — Circuit Switched Public Data Network

• RDT — Recall Dial Tone
• SVP — Senior Vice President
• PACS — Personal Access Communications System
• FDI — Feeder Distribution Interface
• MC — Maintenance Control
• RRN — Routing Recording Number
• CRV — Call Reference Value
• DTD — Document Type Definition (XML)
• OML — Object Model Library
• IMC — Intermediate Metal Conduit
• BUS — Business
• EMR — Electromechanical Relay
• LANE — Local Area Network Emulation
• MMU — Memory Management Unit
• RSL — Restricted Service License
• COT — Central Office Terminal
• AVL — Available
• AVR — Automated Voice Response
• MR — Mobile Router
• WFA — Wait for Answer
• CIC — Carrier Identification Code
• ECM — Electronic Counter Measures
• CGM — Computer Graphics Metafile
• SRR — Search and Rescue Region
• EC — European Community
• CPC — Calling Party Control
• DVB — Digital Video Broadcasting
• NIST — National Institute of Standards & Technology (US)
• VPA — Valid Peripheral Address
• EMCON — Electromagnetic Emission Control
• USA — Underground Service Alert
• C³CM — Command, Control and Communications Countermeasures
• CG — Center of Gravity (DXS)
• 2W — Two Wire
• 100BASE-T — 100 Megabits per second, Baseband, Twisted pair
• VF — Voice Frequency
• ASA — Acoustical Society of America
• CCP — Compression Control Protocol
• SPD — Serial Presence Detect
• LOO — Likelihood of Occurrence
• NSS — Network Switching Subsystem
• SIL — Solid Immersion Lens
• TT — Text-Telephone
• SN — Switching Network
• FITL — Fiber-In-The-Loop
• FGA — Feature Group A
• ANI — Automatic Number Identification (Caller ID)
• WAIS — Wide Area Information Server
• FGD — Feature Group D
• CCD — Charge Coupled Device - a device for the movement of electrical charge.

• NRPB — National Radiological Protection Board
• SCPC — single channel per carrier
• ISAKMP — Internet Security Association and Key Management Protocol
• WHT — Walsh-Hadamard Transform
• VOC — Volatile Organic Compounds (air pollution)
• WPM — speech--words per minute
• VN — Virtual Network
• DSI — Digital Speech Interpolation
• RMS — root mean square (preferred over "RMS")
• LISP — List Processing Language
• CCCH — Common Control Channel
• BSA — Business Software Alliance
• SMS — Service Management System
• SIM — Subscriber Identification Module
• RNX — Restricted Numeric eXchange
• DTI — Digital Trunk Interface
• CDM — Conceptual Data Model
• NOC — Network Operations Center
• FAC — Forced Authorization Code
• SSN — Switched Service Network
• DS-0 — Digital Signal, Level 0
• FEC — Forward Error Correction
• FEP — Front End Processor
• DDI — Direct Dialing Incoming
• ELT — Emergency Locator Transmitter
• OC-256 — Optical Carrier Signal, Level 256
• TDMA — Time Division Multiple Access
• DDN — U.S. Defense Data Network
• UPS — Uninterruptible Power Supply
• TKIP — Temporal Key Integrity Protocol
• NC — Network Channel
• BAN — Building Area Network
• CMA — Communications Management Association
• 1FB — Single line, Flat Business rate;
• ISSN — International Standard Serial Number (ISO 3297)
• JRE — Java Runtime Environment
• CDE — Common Desktop Environment
• FI — Format Identifier
• GAN — Global Area Network
• ADC — Access Deficit Charge
• EEROM — Electronically Erasable Read-Only Memory
• CES — Consumer Electronics Show
• COAX — Coaxial
• BMEWS — Ballistic Missile Early Warning System (bee-mews)
• RCC — Radio Common Carrier
• VPI — Virtual Path Identifier
• ALT — Accelerated Life Test
• APPL — Application
• L2TPV3 — Layer 2 Tunneling Protocol Version 3
• GHZ — Gigahertz

• MLM — Multi-Longitudinal Mode
• DEMUX — Demultiplexer
• HTML — Hyper Text Markup Language
• HDSL — High-bit-rate Digital Subscriber Line
• EISA — Extended Industry Standard Architecture
• ADB — Apple Desktop Bus
• CAD — Computer-Aided Design
• MPEG — Motion Picture Experts Group
• DAT — Digital Audio Tape
• B2B — Business to Businesse
• RICK — Repeater Interface Communications Kit
• ATS — Abstract Test Suite
• ALB — Analog Loopback
• COC — Central Office Connection
• GDM — GSM (Global System for Mobile communications) Data Module
• WVOIP — Wireless Voice over Internet Protocol
• IR — International Roaming
• DSS — Digital Signature Standard
• SCM — Supply Chain Management
• CLK — Clock
• GBT — Ground Based Tower
• RP — Radio Port
• TD — Transmit Data
• TCB — Telecommunication Certification Body
• CAL — Calorie
• MBPS — Megabits per second
• DER — Distinguished Encoding Rules
• IG — Interface Group
• SPGA — Staggered Pin Grid Array
• ACPI — Advanced Configuration and Power Interface
• TU — Transmission Unit
• JTF — Joint Task Force
• CSR — Customer Service Report
• MGMT — Management
• OT — Office of Telecommunications
• ISBN — International Standard Book Number (ISO 2108)
• BT — Burst Tolerance
• NAT — Network Address Translation
• PROM — Programmable Read-Only Memory
• EBS — Electron Bombarded Silicon
• DPA — Distributed-Power Architecture
• LIF — Logical Interchange Format
• NIU — Network Interface Unit
• T&C — Terms & Conditions
• FC — Frame Control
• OFC — Office
• EOB — End Of Business
• RCU — Radio Control Unit
• APDU — Application Protocol Data Units
• NDVI — Normalized Difference Vegetation Index

• CLETS — California Law Enforcement Telecommunication System
• 3GPP — Third Generation Partnership Project
• PD — Pulse Duration
• CRS — Cell Relay Service
• SDP — Software Development Plan
• CBR — Constant Bit Rate
• TC — Transmission Convergence (ATM)
• AWACS — Airborne Warning And Control System
• SOS — Save Our Souls (Help!)
• CSPRM — Common Signaling Protocols Resource Module
• CV — Coding Violation
• ADM — Administration Building
• QDR — Quad Data Rate
• JCL — Job Control Language
• EIA — Extended Interaction Amplifier
• ISG — Information Systems Group
• INTELSAT — International Telecommunications Satellite
• ISI — Intersymbol Interference
• DNS — Domain Name Service
• TOMS — Total Ozone Mapping Spectrometer (satellite Instrument)
• CPS — characters per second
• LATA — Local Access and Transport Area
• EDT — Eastern Daylight Time
• 911 — Emergency Services Phone Number
• DDD — Direct Distance Dialing
• OMF — Object Management Framework
• ACA — Adaptive Channel Allocation
• COMINT — Communications Intelligence
• DLP — Data Link Processor
• RMON — Remote Monitoring
• DVMRP — Distance Vector Multicast Routing Protocol
• VTS — Vessel Traffic Service
• KDC — Kerberos Key Distribution Center
• 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
• DSCP — Differentiated Services Code Point
• FWA — Fixed Wireless Access
• COMDEX — Computer Dealers Exposition
• TAG — Technical Advisory Group for Biological Control Agents of Weeds
• VSAT — Very Small-Aperture Terminal
• EFT — Electronic Funds Transfer
• BCH — Bose-Chaudhuri-Hocquenghem Coding
• IAB — Internet Architecture Board
• FAT — File Allocation Table
• IPS — Instructions Per Second
• SSP — Security Service Provider
• EMS — Element Management System (ATM)
• CD — Critical Dimension
• OSS — Operations Support System
• FCA — Fixed Channel Allocation
• FEP — Front-End Processor

• EULA — End User License Agreement (usually in reference to software)
• BSC — Bi-Synchronous Communications
• IRQ — Interrupt Request
• DPT — Dynamic Packet Transport
• SCM — Single-Carrier Modulation
• AT — Attenuation
• WAP — Wireless Application Protocol
• DUA — Directory User Agent
• CLDC — Connected Limited Device Configuration
• NCF — Network Control Facility
• STMR — Sidetone Masking Rating (telecommunications)
• RDI — Remote Defect Indicator (UNI Fault Management)
• ULL — Unbundled Local Loop
• CACH — Call Appearance Call Handling
• DN — Distinguished Name
• JDK — Java Development Kit
• PAM — Payload Assist Module
• TCA — Threshold Crossing Alert
• WTS — Wireless Telecommunications Symposium
• MMM — Mobile Media Mode
• CFNRY — Call Forwarding on No Reply
• OMP — Open Management Platform
• ARM — Asynchronous Response Mode
• WDA — Wireless Digital Assistant
• DPDU — Data Protocol Data Unit
• INE — Intelligent Network Element
• UART — Universal Asynchronous Receiver/Transmitter
• SAT — Satellite
• MIME — Multipurpose Internet Mail Extension
• TSC — Test System Controller
• QI — Quality Indicator
• BLER — Block Error Rate
• CRLF — Carriage-Return Line-Feed
• TP — Telephone Pole
• USGS — United States Geological Survey (DOI)
• VMS — Virtual Memory System
• VBA — Visual BASIC for Applications
• SCR — Sustainable Cell Rate
• HEX — Hexadecimal (base 16)
• LRC — Learning Resource Center
• SCR — System Change Request
• CSO — Customer Service Operations
• RFR — Radio Frequency Radiation
• WMO — World Meteorological Organization (ICSU)
• YA — Yet Another
• LI — Length Indicator
• LIDB — Line Information DataBase
• MBWA — Mobile Broadband Wireless Access
• BIS — Brought Into Service
• EDFA — Erbium-Doped Fiber Amplifier

• ESCON — Enterprise System Connection
• OOP — Object-Oriented Programming
• D-RAM — Dynamic Random Access Memory
• GS — Ground Start
• TDD — Time Division Duplex
• LCF — Location Confirm
• TFTP — Trivial File Transfer Protocol (ATM)
• UCF — Unregistration Confirm
• ACC — Area Control Center
• IP — Intellectual Property
• PDL — Positioning Data Link
• FH — Frequency Hopping
• MGC — Multimedia Gateway Controller
• MF — Multiple Frequency
• SSMA — Spread-Spectrum Multiple Access
• SISIR — Singapore Institute of Standards and Industrial Research
• WAE — Wireless Application Environment
• ANC — Access Network Controller
• 2G — Second generation cellular
• OTA — Office of Technology Assessment (U.S.; abolished by Congress, Fall 1995)
• RADIUS — Remote Authentication Dial-In User Service
• DA — deca
• CNG — Fax Calling Tone
• ICANN — Internet Corporation for Assigned Names and Numbers
• VR — Virtual Router
• EIR — Equipment Identity Register
• EMS — Express Mail Service
• CRBT — Caller Ring Back Tone
• EBCDIC — Extended Binary-Coded Decimal Interchange Code
• 4W — Four-Wire
• LSW — Least Significant Word
• ASAR — Advanced Synthetic Aperture Radar 
• RLU — Remote Line Unit
• KM — Knowledge Management
• RJE — Remote Job Entry
• VNS — Virtual Network System
• BSI — British Standards Institution
• EMF — Event Management Framework
• RSS — Radio Service Software (Motorola)
• MCC — Mission Control Center (JSC)
• NRP — Network Resource Planning
• LCP — Local Control Point
• CID — Craft Interface Device
• BER — Basic Encoding Rules (ASN.1)
• WARC — World Administrative Radio Conference
• UMTS — Universal Mobile Telecommunications Service
• PCMCIA — Personal Computer Memory Card International Association
• CHTML — Compact Hypertext Markup Language
• IAD — Integrated Access Device
• TCC — Transmission Control Code

• NAS — Network-Attached Storage
• ABM — Asynchronous Balanced Mode
• DIL — Direct Inward Line
• EVA — Electronic Video Agent
• IMEI — International Mobile Equipment Identity
• DE — Discard Eligibility (ATM)
• TP — Transition Point
• SNA — System Network Architecture
• FNN — Full National Number
• CAPTAIN — Character And Pattern Telephone Access Information Network
• FTTC — Fiber To The Curb光纤到路边
• AFOSR — Air Force Office Of Scientific Research(USA)
• B-ISDN — Broadband Integrated Services Digital Network
• UMA — Unlicensed Mobile Access
• LRC — Longitudinal Redundancy Check
• LB — Local Battery
• TTY — Text Teletype
• PNP — Plug-and-Play
• LMS — Learning management system
• SRL — Singing Return Loss
• CPAP — Customer Premises Access Profile
• CRIS — Carrier Route Information System
• B6ZS — Bipolar 6 Zero Substitution
• OSF — Open Software Foundation
• IEEE — Institute of Electrical and Electronics Engineers
• RMS — Resource Management System
• VLAN — Virtual Local Area Network
• TRS — Trunked Radio Systems
• DII — Defense Information Infrastructure
• MSDP — Multicast Source Discovery Protocol
• PCCA — Portable Computer Communications Association
• RGN — Region
• PST — Pacific Standard Time (UTC-8 Hours)
• RDBMS — Relational Data Base Management System (Oracle)
• HLR — Home Location Register
• TBCD — Telephony Binary Coded Decimal
• CTO — Commonwealth Telecommunications Organisation
• VPX — Virtual Path Cross-Connect
• MFC — Multi-Frequency Code
• CLD — Cross-Layer Design
• CMOS — Complementary Metal Oxide Semiconductors
• LCR — Least Cost Routing
• RDMA — Remote Direct Memory Access
• SPID — Service Profile Identifier
• VCI — Virtual Channel Identifier
• SE — Southeast
• CCR — Customer Controlled Reconfiguration (Sprint)
• DTE — Digital Terminal Equipment
• CIAC — Computer Incident Advisory Capability
• ETN — Electronic Tandem Network

• VLSI — Very-Large-Scale Integration
• IRDA — Infrared Data Association
• RCP — Right-Hand Circular Polarization
• QS — Quasi-Synchronous
• RTC — Right to Carry
• CON — Concentrator
• CPG — Converged Packet Gateway
• LH — Link Handler
• DCS — Data Collection System (NOAA Polar Orbiting Satellites)
• RISC — Reduced Instruction Set Computing
• TEI — Terminal Endpoint Identifier
• AWG — arrayed waveguide grating
• OSHA — Occupational Safety and Health Act (1970)
• FMR — Follow Me Roaming
• ECS — Encryption Control Signal
• BP — Block Parity
• ASN.1 — Abstract Syntax Notation One
• VBR — Variable Bit Rate (ATM)
• OD — Outside Diameter
• HFC — Hybrid Fiber/Coaxial network
• MHO — My Humble Opinion
• P&A — Privacy and Authentication
• CPOP — Circuit Precedence Over Packet data
• CMIP — Common Management Information Protocol (ATM)
• SUS — Suspension
• RSS — root-sum-square
• ECM — Error Correction Model
• BLOS — Beyond Line-Of-Sight
• TP — Termination Point
• WSDL — Web Services Description Language
• POP — Post Office Protocol
• WINS — Windows Internet Name Service
• EA — Extended Address Field Bit
• CALEA — Communications Assistance for Law Enforcement Act
• SPC — Statistical Process Control. Forerunning quality theory from the 1960s to TQC and TQM.
• OBC — Onboard Computer
• IPCP — Internet Protocol Control Protocol
• DSN — Defense Switched Network
• HDML — Handheld Device Markup Language
• AMPS — Advanced Mobile Phone System
• VLSI — Very Large-Scale Integration
• DOD — Dial on Demand
• DARTS — Design Approach for Real-Time Systems
• VOB — Versioned Object Base
• TNI — Telephone Network Interface
• CT — Cordless Telecommunications
• WTO — World Trade Organisation
• FR — Functional Requirement
• FEXT — Far-End Cross Talk
• EBIC — Electron Beam Induced Current

• SMB — Server Message Block
• WSFL — Web Services Flow Language
• CIRC — Cross-Interleaved Reed-Solomon Code
• BCDIC — Binary Coded Decimal Interchange Code
• ABBR — Abbreviation
• CIS — Center for Integrated Systems
• LXT — Local Exchange Terminal
• CAVE — Cellular Authentication and Voice Encryption Algorithm
• NAFTA — North American Free Trade Agreement
• 3G — 3rd Generation Wireless Format
• IMSI — International Mobile Subscriber Identity
• RDT — Remote Digital Terminal
• EST — Establish
• DPCM — differential pulse code modulation
• RQMT — Requirement
• DXC — Digital Cross Connect
• YABA — Yet Another Bloody Acronym
• PEM — Privacy-Enhanced Mail
• WIN — Wireless Intelligent Network
• WFA — Work Force Administration
• ET — Exchange Terminal
• CSCW — Computer-Supported Cooperative Work
• DIV — Divisionsion
• CSP — Converged Service Platform
• CC — Composite Clock (SONET)
• FTTK — Fibre To The Kerb
• LAG — Link Aggregation Group
• NII — National Information Infrastructure (USA)
• FEA — Finite Element Analysis
• HSPA — High Speed Packet Access
• SCC — Specialized Common Carrier
• DRQ — Disengage Request
• DDCMP — Digital Data Communications Message Protocol
• RAD — Recorded Announcement Device
• TED — Triteal Enterprise Desktop
• JST — Japan Standard Time
• PSN — Packet Switched Network
• ASN.1 — Abstract Syntax Notation 1
• SCE — Service Creation Environment
• APN — An Access Point Name
• CCNA — Cisco Certified Network Associated
• VHSIC — Very High-Speed Integrated Circuit
• FMS — Fixed Mobile Substitution
• POE — power over ethernetinjector
• VPWS — Virtual Private Wire Service
• ALI — Automatic Location Information
• VQV — Voice Quality Value
• 2G — Second Generation Wireless Systems
• SITA — Société Internationale de Télécommunications Aéronautiques
• GLT — Great Lakes Telecom

• ACSE — Association Control Service Element
• AMPS — Advanced Mobile Phone Service (cellular phone standard)
• RADIUS — Remote Authentication dial In User Service
• UTL — Utility
• SLAM — Scanning Laser Acoustic Microscope
• AMOLED — Active Matrix Organic Light-Emitting Diode
• PJC — Pointer Justification Count
• DOD — Direct Outward Dialing
• WTL — Wireless Transport Layer
• CTE — Computer Telephony Engineer
• CM — Connection Manager
• ROS — Return on Sales
• ADF — automatic document feeder
• AAP — Alternate Access Provider
• TLT — Test Loop Translator
• DDM — Data Distribution Manager
• VCA — Voice Connecting Arrangement
• TEL — Telephone
• LRQ — Location Request
• DFG — difference-frequency generation
• CDM — Configuration Data Manager
• LIM — Line Isolation Monitor
• DDSN — Digital Derived Services Network
• EM — Element Manager
• 3G — Third Generation (mobile communication system)
• PTT — Push to Talk Technology
• ASQ — Alpha System Qualification
• HPN — Home Phone Network
• CAMA — Centralized Automatic Message Accounting
• SIGTRAN — Signaling Transport
• TTYL — Type To You Later
• DQDB — Distributed Queue Dual Bus
• TXM — Transmission X-ray Microscope
• EMI — Electro-Magnetic Interference
• VESA — Video Electronics Standards Association
• DPSK — Differential Phase Shift Keying
• VO — Voice Only
• SMDS — Switched Multimegabit Data Service (ATM)
• ECE — Economische Commissie voor Europa (United Nations) (Dutch: Economic Commission for Europe)
• PY — person-year
• TCM — Time Compression Multiplexer
• 3-D — 3-Dimensional
• FECN — Forward Explicit Congestion Notification (ATM)
• CODEC — Coder/decoder
• NDS — Novell Directory Services
• DCF — Distributed Coordination Function
• KSU — Key Service Unit
• 4WAI — Four-Wire Analog Interface
• VLF — Vertical-Laminar-Flow
• NIMBY — Not In My Back Yard

• DCMI — Dublin Core Metadata Initiative (Online Computer Library Center)
• X — X Window System
• BSID — Base Station Identity
• TP — Transaction Processor
• CPH — Call Party Handling
• TACSAT — Tactical Satellite
• ECR — Electronic Cash Register
• CTIA — Cellular Telecommunications Industry Association
• CRB — Cramer-Rao Bound
• CBEMA — Computer & Business Equipment Manufacturers Association
• LMS — Location and Monitoring Service
• FPS — Framing Pattern Sequence
• SMI — Structure of Management Information
• DCAS — Downloadable Conditional Access System
• BY — Busy
• OSA — Open System Architecture
• ADPC — Automatic Data Processing Center
• AAS — advanced automation system (FAA)
• NFPA — National Fire Protection Association
• RPV — Remotely Piloted Vehicle
• ACF — Advanced Communications Function (IBM)
• TOC — Telecommunication Operations Center
• UML — Unified Modeling Language (Object Management Group, OMG)
• CRBT — Color Ring Back Tone
• BHCA — Busy Hour Call Attempt
• VSC — Vertical Service Code
• LVM — Line Verification Module
• CCNA — Cisco Certified Network Administrator
• 4G — Fourth Generation Wireless Systems
• TIFF — Tag Image File Format
• LT — Line Termination
• BAM — Basic Access Module
• ECP — Engineering Change Proposals
• CPT — Cellular Paging Teleservice
• LLA — Link Level Access
• LIS — Lightning Imaging Sensor
• FMC — Fixed Mobile Convergence "Mobile UC or Unified Communications over Wireless"
• IBSS — Independent Basic Service Set
• DAF — Directory Access Function
• CLCC — Ceramic Leaded Chip Carrier
• PM — Processable Mode
• VCR — Videocassette Recorder
• DDU — Digital Data Unit
• AMSS — Automatic Message Switching System
• CCIR — International Radio Consultative Committee (French Acronym)
• CMT — Commercial Metering Transponder
• MB — Measured Business
• DPDT — Double-Pole Double-Throw
• BIND — Berkeley Internet Name Domain
• VSAM — Virtual Storage Access Method

• NE — Network Element
• DTU — Data Transfer Unit
• SPA — Special Prorate Agreement
• STP — standard temperature and pressure (0° and 1 atm)
• CNG — comfort noise generation
• C3I — Command, Control, Communications & Intelligence
• TPS — Telephone Preference Service
• IWF — Interworking Function
• TCS — Telephony Control Specification
• PARC — Palo Alto Research Center
• ATS — Automatic Transfer Switch
• MAP — Mobile Application Part
• CC — Country Code
• IPLC — International Private Leased Circuit
• UCM — Use Case Map
• WORM — Write-Once, Read-Many
• LP — Line Pair
• RAU — Radio Access Unit (Army)
• OXCO — Oven-Controlled Crystal Oscillator
• SSAP — Source Service Access Point
• SMU — Service Management Unit
• LEC — Local Exchange Carrier
• AUI — Attachment Unit Interface
• RECON — Reconnaissance
• CCITT — Comit? Consultatif International T?l?graphique et T?l?phonique
• OWS — Operator Work Station
• AI — Adapter Interface
• GDK — GIMP (GNU Image Manipulation Program) Drawing Kit
• BASIZE — Buffer Allocation Size
• RBS — Robbed Bit Signaling
• PTP — Point To point Protocol
• YAHOO — You Are Hazy Over Oranges
• NTDS — Naval Tactical Data System
• SIO — Service Information Octet
• PSDN — Public Switched Digital Network
• ESCA — photoelectron spectroscopy for chemical analysis
• SONET — Synchronous Optical Network
• AMP — amplifier / amplification
• TBPS — Terabits Per Second
• EFCI — Explicit Forward Congestion Indication (ATM)
• BPP — Billed Party Preference
• EDSX — Electronic Digital Signal Cross-Connect
• AFPS — Automatic Facility Protection Switching
• NMS — NetWare Management System
• SMSC — Short Message Service Center
• DPBX — Digital Private Branch Exchange
• APPC — Advanced Program-to Program Communications
• ATB — Above-Ground Telecommunications Backbone
• BNC — Bayonet Neill-Concelman
• ESA — Enhanced Subscriber Authentication

• DECCO — DISA Defense Commercial Communications Office
• ACT — ACTIVITY, ACTIVITIES
• SIP — Session Initiation Protocol
• SVC — Switched Virtual Circuit (ATM)
• CICS — Customer Information Control System (IBM Mainframe Software; Kicks Or C-I-C-S)
• DNSIX — Defense Network Security Information Exchange
• PTT — Push to Talk Taster
• SMPTE — Society of Motion Picture and Television Engineers, Inc.
• BOM — Bit-Oriented Message
• TDD — Telecommunications Device for the Deaf
• DLL — Digital Local Line
• F — Frequency
• TSR — Terabit Switch/Router
• SCH — Synchronization Channel
• FMS — Fraud Management System
• 4GL — Fourth-Generation Language
• WAR — Wireless Access Revolution
• DAC — Digital-To-Analog Converter
• DOCSIS — Data over Cable Service Interface Specification
• VRML — Virtual Reality Modeling Language
• FM — frequency modulation
• DXF — Data Exchange Format
• BC — Basic Call
• MAG — Mobile Access Gateway
• ANAC — An Automatic Number Announcement Circuit
• STU — Secure Telephone Unit
• STN — Station
• EVC — Electronic Voucher Charging
• RACH — Random Access Channel
• DIS — Draft International Standard
• NCSA — National Center for Supercomputing Applications
• CES — Circuit Emulation Service
• DISN — Defense Information Systems Network
• LBR — Low Bit Rate
• LDP — Label Distribution Protocol
• SR — Scanning Radiometer
• AAV — Alternate Access Vendor
• DRFM — Digital Radio-Frequency Memory
• IMAP — Internet Mail Access Protocol
• NE — North-East
• BELLCORE — Bell Communications Research, Inc.
• IRTF — Internet Research Task Force
• 3GPP — Third-Generation Partnership Project
• UDP — Up Down Pair
• MCP — Microsoft Certified Professional
• ASEAN — Association of South East Asian Nations
• NLM — National Library of Medicine (National Institutes of Health)
• ADCCP — Advanced Data Communication Control Procedures
• SQL — Specified Quality Level
• SAM — Service Access Multiplexer

• VCC — Virtual Channel Connection (ATM)
• CGI — Cell Global Identity
• PUK — PIN (Personal Identification Number) Unlocking Key
• PIC — Programmable Interrupt Controller
• FOIP — Fax Over Internet Protocol
• NOAO — National Optical Astronomy Observatories (Tucson, AZ)
• EV — electronvolt
• CVD — Chemical Vapor Deposition
• BTAM — Basic Telecommunications Access Method
• NFR — Near-Field Recording
• LSC — Link State Control
• NCP — Network Control Protocol
• PBT — Polybutylene Terephthalate
• CIP — Continuous Improvement Program
• ACF — Access Coordination Function
• MITI — Ministry of International Trade and Industry
• NCOS — Network Class Of Service
• BSS — Broadband Switching System
• PLE — Path Length Efficiency
• VDR — Voice Digitization Rate
• MAC — Message Authenticity Check
• TCP/IP — Transmission Control/Internet Protocol
• CSIRO — Commonwealth Scientific and Industrial Research Organization
• AMTFT — Active Matrix Thin Film Transistor
• ISC — International Switching Center
• 4WA — Four Wire Analog
• NAK — Negative Acknowledge
• ENV — Environment
• CQ — Communications Quality
• FCA — Free Carrier Alongside
• WNAP — Wireless Network Access Point
• AAL5 — ATM (Asynchronous Transmission Mode) Adaptation Layer 5
• FDD — Frequency Division Duplex
• CCA — Carrier-Controlled Approach
• RRC — Root Raised-Cosine
• WK — Week
• TACS — Total Access Cellular System
• LSI — Large Scale Integration -> VLSI
• CBQ — Class-Based Queuing
• PLL — Phase Locked Loop
• TRIG — Trigger
• MGCP — Multimedia Gateway Control Protocol
• ITA — Illinois Telecommunications Association
• SDSL — Symmetric Digital Subscriber Line
• GTB — Global Telecom Brokers
• S/N — Signal-to-Noise ratio
• NREN — National Research and Education Network
• FTTP — Fiber To The Premises
• DTL — Defense Telephone Link
• ELFEXT — Equal-Level Far-End Cross-Talk

• UDT — Unreliable Data Transfer
• LFACS — Loop Facility Assignment and Control System
• CDA — Communications Decency Act's
• BDE — Borland Database Engine
• BDFB — Battery Distribution Feeder Bay
• BT — Bluetooth Tablet
• RX — Receive
• PTP — Point to Point Transmission Service (electricity)
• COFA — Change Of Frame Alignment
• IDF — Independent Distribution Frame
• DSCS — Defense Satellite Communication System
• TRMM — Tropical Rainfall Measuring Mission (US-Japan)
• BPSK — Binary Phase-shift Keying
• NT — New Technology, also Windows NT
• SIMT — Système interbancaire marocain de télécompensation
• BSA — Basic Service Area
• SDP — Session Description Protocol
• RCS — Radar Cross Section
• PDSO — Packet Data Security Overlay
• ACEK — Authentication Encryption Key
• CBMS — Computer-Based Message System
• OSD — Onscreen Display
• QOD — Quality of Data
• TDR — Time-Domain Reflectometry
• SXS — Step-By-Step
• IESG — Internet Engineering Steering Group
• ESN — Electronic Serial Number
• CCITT — Comite Consultatif International Telegraphique et Telephonique (now ITU-T)
• LSAP — Link Service Access Point
• RCT — remote Control Terminal
• FIOS — Fiber Optic Services
• ACM — Address Complete Message
• DLCI — data link connection identifier
• MMSI — Maritime Mobile Service Identity
• IVP — Integrated Voice Protocol
• SS7 — Signaling System 7
• WSA — Wireless Security Auditor
• CTI — Computer Telephony Integration
• TARP — Target Identifier Address Resolution Protocol
• HTML — Hyper-Text Markup Language
• SES — Scientific and Engineering Software
• PTT — Push to Talk Testing
• TRX — Tandem Repeater eXchange
• SVI — Service Interception
• ATD — Advanced Technology Demonstration
• DCEF — Distributed Cisco Express Forwarding
• RIPE NCC — Reseaux IP Europeens Network Coordination Centre
• IPRC — Intellectual Property Rights Committee
• ARFA — Allied Radio Frequency Agency
• LRM — Long Reach Multimode

• AF — Assured Forwarding
• CU — Cooling Unit
• SKU — Stockkeeping Unit
• ADTM — Asynchronous Data Transfer Mode
• MPU — Main Processor Unit
• 4 GIG — 4 Giga Intellectual Gadget
• CAC — Connection Admission Control (Asynchronous Transfer Mode)
• UPT — Universal Personal Telecommunications
• CSP — Continuous Speech Processing
• NSAI — National Standards Authority of Ireland
• MSRN — Mobile Station Roaming Number
• USF — Universal Server Farm
• B2B — Business-to-Business
• CGI — Computer Graphics Interface
• USF — Universal Service Fund
• SWBD — Switchboard
• UBR — Unspecified Bit Rate
• NMC — Network Management Center
• CDV — Compressed Digital Video
• P2P — Person-to-Person
• EGSM — Extended Global System for Mobile Communications
• FDOA — Frequency Difference Of Arrival
• DOT — Department of Telecommunications (India)
• PMMA — Polymethyl Methacrylate
• AMA — automatic message accounting
• ASE — Application Service Element
• NCAR — National Center for Atmospheric Research (US)
• PMT — Photo Multiplier Tube
• DS0 — Digital Signal Zero
• B8ZS — Binary Eight Zero Substitution
• AFRINIC — African Network Information Centre
• RJ-14 — Registered Jack type 14 (2-wire connector)
• CS — Connection Segment
• GMSS — Global Mobile Satellite System
• COP — Character Oriented Protocol
• TDWR — Terminal Doppler Weather Radar
• LN — Line
• BHCC — Busy Hour Call Completions
• CDVT — Cell Delay Variation Tolerance
• WNMS — Wireless Network Management System
• DL — Downlink Message
• DMS — Defense Messaging System
• SRS — Supported Residential Services
• DISA — U.S. Defense Information Systems Agency
• NW — North West
• IPVX — Internet Protocol version X
• CMC — Career Management Center
• NSAP — Network Service Access Point
• ATRAC — Adaptive Transform Acoustic Coding
• PSN — Public Switched Network

• B-ISDN — Broadband ISDN
• LMS — Local Measured Service
• UAT — Universal Access Transceiver
• VTAM — Virtual Telecommunication Access Method
• IDCU — Integrated Digital Carrier Unit
• PMOS — P-channel Metal Oxide Semiconductor
• SGS — Software Generation System
• SPT — System Page Table
• ERL — Echo Return Loss
• APS — Advanced Power System
• IOC — Interoffice Channel
• DCO — Dial Central Office
• HSCSWD — High-Speed Circuit-SWitched Data
• MCR — Minimum Cell Rate (ATM)
• VOB — Voice Over Broadband
• ARSR — Air Route Surveillance Radar
• OCC — Occupancy
• CEPT — Conférence Européenne des Administrations des Postes et des Télécommunications
• DECT — Digital Enhanced Cordless Telecommunication
• ALT — Automatic Link Transfer
• CPE — Customer Premise Equipment
• IR — Information Request
• SR — Slow Release
• ALCAP — Access Link Control Application Protocol
• DNC — Do Not Call
• ESP — Essential Service Protection
• SDN — Software Defined Network
• TPF — Transmission Priority Field
• PTM — Point-To-Multipoint
• IV&V — independent verification and validation
• IDCP — Internet Device Control Protocol
• CSR — Customer Service Request
• LMDS — Local Multipoint Distribution Service
• SRA — Seamless Rate Adaptation
• QOI — Quality of Information
• L2TP — Layer 2 Tunneling Protocol
• CCC — CDMA Cluster Controller
• DCC — Digital Control Channel
• CSI — Clearing Subnetwork Identification
• ADP — Automatic Data Processor
• NCC — Network Control Center (GSFC)
• LQC — Line Quality Control
• LULT — Line Unit/Line Termination
• WDMW — Web Directory for Mobile and Wireless
• TSD — Type Specific Driver
• NCP — Network Control Program
• LPD — Low Probability of Detection
• ATIS — Automatic Transmitter Identification System
• WFG — Wireless Firewall Gateway
• DSP — Data Service Provider

• PIM — Protocol Independent Multicast
• VFL — Visual Fault Locator
• TSGR — Transport System Generic Requirements
• PSQM — Perceptual Speech Quality Measure
• OLS — Optical Line System
• UTP — Universal Transmission Protocol
• DDLD — Direct Dial Long Distance
• STA — Science and Technology Agency (Japan)
• AAS — Automatic Announcement Subsystem
• DNA — Do Not Answer
• MMS — Multimedia Message Service
• DLT — Delete
• LCAS — Link Capacity Adjustment Scheme
• CVT — Circuit Validation Test
• DTR — Down-Time Ratio
• SINAD — SIgnal-to-(Noise And Distortion) ratio
• DPST — Double-Pole Single-Throw
• RADINT — Radar Intelligence
• TOP — technical/office protocol
• ANT — ADSL Network Terminator
• MTS — Message Transmission Subsystem
• ISP — International Signaling Point
• DACS — Digital Access Cross-connect System
• ROW — Rest Of World
• BTO — Betts Telecom Oklahoma
• TDRSS — Tracking and Data Relay Satellite System
• RS-422 — Recommended Standard 422 (ANSI/EIA standard for transmitting serial data)
• CSDU — Core Service Data Unit
• DUV — Deep Ultraviolet
• QEDI — Quod Erat Demonstrandum
• SCC — Signal Conversion Circuit
• RFI — Remote File Inquiry
• UNI — User-Network Interface
• ATCA — Advanced Telecom Computing Architecture
• FSAI — Fiber Serving Area Interface
• CPN — Customer Premise Network
• LAAS — Local Area Augmentation System
• EPP — Enhanced Parallel Port (PC)
• CSU — Channel Service Unit
• MTD — Moving Target Detection
• ATS — Air Traffic Services
• PLCP — Physical Layer Convergence Procedure
• LDI — Long Distance Interconnect
• DS-3 — Digital Signal, Level 3
• TTL — ToS and Time-to-Live
• PCS — Personal Communications Services
• FRAD — Frame Relay Access Device
• CDA — Communications Decency Act of 1996
• TSC — Technical Standards Committee
• SCCS — Switching Control Center System

• URN — Uniform Resource Namespace
• SR — Service Request
• MMDS — Multichannel Multipoint Distribution Service
• DSSSL — Document Style Semantics and Specification Language
• TDM — Time Division Multiplexing
• CAR — committed access rate
• BHP — Burst Header Packet
• AMTI — Airborne Moving Target Indicator
• MBS — Maximum Burst Size (ATM)
• DFE — Design For Environment
• UIH — Unnumbered Information with Header check
• RYP — Russian Yellow Pages
• ASTD — American Society of Training and Development (Alexandria, Virginia)
• DCA — Distributed Communications Architecture
• SPE — Synchronous Payload Envelope
• TELNET — Telecommunications Network Protocol
• SMG — Super Master Group
• VADB — Virtual Auto Dial Backup
• BSVCI — Broadcast Signaling Virtual Channel Identifier
• TM — Thematic Mapper (Landsat)
• SMS — System Management Server
• 1-ESS — x-ESS series of Electronic Switching Systems
• SAPI — Service Access Point Identifier
• SHR — Self-Healing Ring
• MAPDU — Management Application Protocol Data Unit
• BT — Back Trace
• DORK — Disciples Of The Righteous King
• PSK — Phase Shift Key
• MED — Manipulative Electronic Deception
• ALI — Automatic Location Identifier
• RADSL — Rate Adaptive Digital Subscriber Line
• ITT — Invitation To Tender
• STM — Synchronous Transfer Mode
• MBE — Molecular Beam Epitaxy
• MOS — Metal Oxide Semiconductor (FET Devices)
• M/W — MicroWave
• ADPCM — Adaptive Differential Pulse Code Modulation
• ECC — Emergency Communications Center
• LMT — Lightwave Microcell Transceiver
• SAR — Segmentation and Reassembly (ATM)
• NEMP — Nuclear Electromagnetic Pulse
• TFL — Telecom Fiji Limited
• UMTS — Universal Mobile Telecommunications Standard
• ODS — Operational Data Store (knowledge management)
• MILNET — Military Network
• OIM — Operations Interface Module
• 3G HSPA — Third-Generation High-Speed Packet Access
• DAC — Digital to Analog Converter-Audio
• MTI — Moving Target Indicator
• WCDMA — Wideband Code Division Multiple Access

• BB — Blackberry
• PRM — Performance Report Message
• AECT — Association for Educational Communications and Technology's
• SYM — Symmetric
• CSAR — Combat Search and Rescue
• IRF — Impulse Response Function
• GFC — Generic Flow Control (ATM)
• PLCP — Physical Layer Convergence Protocol (ATM)
• SETI — Search for Extraterrestrial Intelligence
• EMS — Enhanced Messaging Service
• TSDU — Transport Service Data Unit
• 3GIP — Third Generation Internet Protocol
• ADTS — Automated Digital Terminal System
• GBPS — Gigabits per second
• DACS — Digital Access and Cross-Connect System
• DXI — Data Exchange Interface
• NWK — Network
• VSM — Vestigial Sideband Modulation
• ADTS — Ameritech Digital Transport Service
• DPNSS — Digital Private Network Signaling System
• TTY — teletype terminal
• APS — American Protective Services
• KSPS — KiloSymbols Per Second
• CAMEL — Customized Applications for Mobile-network Enhanced Logic
• ESPN — Entertainment and Sports Programming Network
• ECS — Environmental Control System (Subsystem)
• NESC — National Electrical Safety Code
• CEE — Communaut? Economique Europ?enne
• IOS — Internet Over Satellite
• CSAA — Central Service Area Authority
• DUV — Data-Under-Voice
• DNI — Data Network Interface
• COBE — Corporate Owned Business Only
• CERN — Conseil Europeen Pour La Recherche Nucleaire
• INAP — Intelligent Network Application Part
• BUFR — Binary Universal Form for the Representation (of data)
• CLP — Cell Loss Priority (ATM)
• WIG — Wireless Internet Gateway
• NLM — NetWare Loadable Module
• V — Vector
• MEH — Mobile-Executed Handoff
• OCI — object code insertion
• C² — Command and Control
• PNP — Positive-Negative-Positive
• EMV — EuroPay, MasterCard, Visa
• WAW — Wide Area Wireless
• FEM — Finite Element Method
• DLU — Digital Line Unit
• RQMTS — Requirements
• SEM — Scanning Electron Microscopes

• VRT — Voltage Reduction Technology
• AEA — American Electronics Association's
• ARPT — Autorité de Régulation des Postes et Télécommunications
• MP — Master Processor
• EA — expedited acknowledgement
• MDN — Mobile Directory Number
• CCLC — Carrier Common Line Charge
• MLA — Modern Language Association
• CMM — Calls, Minimums, Maximums
• TSI — time-slot interchange
• NTU — Network Termination Unit
• DBRNC — deciBel Relative to Noise in a Circuit
• SA — Selective Availability (on GPS transmissions)
• B-CPE — Broadband Customer Premises Equipment
• TC — Technical Committee (HL7)
• BNCC — Base Network Control Center
• HDTV — High-Definition Television
• ANSI — Advanced Network Signaling Input
• LOP-P — Loss Of Pointer - Path
• SDHLR — Super-Distributed Home Location Register
• WSP — Wireless Service Provider
• OMA — Open Mobile Alliance
• SFN — Single Frequency Network
• AAL — ATM (Asynchronous Transmission Mode) Adaptive Layer
• DCSS — Digital Cross-connect Systems
• CALA — Customer Address Location Area
• ANSI-41 — ANSI standard for mobile management
• DBN — Dial-Back Number
• AS — Active Service
• EST — Electroshock Therapy
• TRANS — Transaction
• ADM — Administration, Office of
• SVC — Single Voice Coil
• CDV — Cell Delay Variation(ATM)
• NMC — Network Model Coverage
• FTAM — File Transfer Access and Management
• DICOM — Digital Imaging and Communications in Medicine
• MAJ — Major
• SLIC — Subscriber Loop Interface Circuit
• CACM — Communications of the ACM
• CDR — Common Data Rate
• SNI — Service Node Interface
• DMT — Discrete Multi-tone Transmission
• FAT — Final Acceptance Testing
• VISSR — visible and infrared spin scan radiometer (GOES)
• MFLOPS — Millions of Floating Point Operations per Second
• FD — Full Duplex
• SS1 — Signalling System 1 (500/20 Hz tones)
• SFX — Special Effects
• AL — Alignment

• RCR — Research and Development Center for Radio Systems
• IEEE-CS — Institute of Electrical and Electronics Engineers Computer Society
• EADAS — Engineering and Administrative Data Acquisition System
• ASYNC — Asynchronous
• OOK — On/Off Keying
• RSI — Record Status Indicator
• ARD — Automatic Ring Down
• CW — Call Waiting Supplementary Service
• MTP — Message Transfer Part
• IEEE-SA — Institute of Electrical and Electronics Engineers - Standards Association
• TLP — Transmission Level Point
• IPTD — Internet Protocol Telephony Design
• IDLC — Integrated Digital Loop Carrier
• OID — Object Interaction Diagram
• SACS — Security Access Control System
• ARAI — Adjunct Route Application Interface
• A/D — Analog-to-Digital converter
• RNR — Receive Not Ready
• DLT — Digital Line Termination
• CLOS — Clear Line Of Sight
• SDNS — Secure Data Network System
• DMI — Desktop Management Interface (computing)
• GSTN — General Switched Telephone Network
• DW — Deep Water
• WCMP — Wireless Control Message Protocol
• MSI — Maritime Safety Information
• DOITT — Department of Information Technology and Telecommunications
• AGCH — Access Grant Channel
• CFOT — Certified Fiber-Optic Technician
• IPXCP — Internetwork Packet Exchange Control Protocol
• PNE — Path Number Efficiency
• DM — Design Manager
• SDCCH — Standalone Dedicated Control Channel
• BSRF — Basic System Reference Frequency
• TACACS — Terminal Access Controller Access Control System
• AMR — Automated meter reading also known as Automatic Meter Reading
• VAS — Value Added Services
• NSN — National Significant Number
• ATU-C — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Central office end
• DMT — Discrete Multi-Tone Technology
• BCSM — Basic Call State Model
• CR — Connection Request
• DNU — Do Not Use
• * — Star, special function key
• UASL — Unified Access Service License
• WBMP — Wireless Bitmap
• TOMS — Telecom Operations Management System
• MCPC — Multiple Channels Per Carrier
• BSSMAP — Base Station System Management Application Part
• CAAS — Communications-as-a-Service

• HUMAN — High-speed Unlicensed Metropolitan Area Network
• VTAC — Vermont Telecom Advancement Center
• APTC — Atlantic Provinces Telecommunications Council
• # — Number sign, octothorp; special function key
• LRF — Laser Range Finder
• DEM — Digital Elevation Model
• BDSL — Broadband Digital Subscriber Line
• RCMAC — Recent Change Memory Administration Center
• STDM — Statistical Time Division Multiplexing
• BAN — Billing Account Number
• USRT — Universal Synchronous Receiver/Transmitter
• AVT — Audio Visual Telecommunications
• LAT — Local Area Transport (network)
• AB — Answer Back
• WUP — Wired Up Privacy
• E-TDMA — Expanded Time Division Multiple Access
• E — Echo Time Zone
• AIS-V — Alarm Indication Signal - Virtual
• CF — Coin First Payphone
• ZD — Zero Defects
• TD-CDMA — Time Division - Code Division Multiple Access
• FLL — Fixed-Loss Loop
• NICT — National Institute of Information and Communications Technology
• USPI — Universal Serial Phone Interface
• WCRL — Wireless Communications Research Laboratory
• CTSO — Cellular Telephone Service Order
• L2F — Layer 2 Forwarding protocol
• MOA — Managed Object Agent
• MIN — Mobile Identification Number
• VF0 — Voice Fundamental Frequency
• WPBX — Wireless Private Branch Exchange
• DEO — Digital End Office
• AIU — Analog Interface Unit
• DX — Duplex Signaling
• CONS — Connection-oriented Network Services
• ATL — Atlanta
• TTC — Telemetry Telecommand and Control
• CM — Common Mode
• F/W — Firmware
• HSC — High Speed Connect
• TBRL — Terminal Balance Return Loss
• RZ — Return to Zero
• JWG — Joint Working Groupof
• FAW — Frame Alignment Word
• LIU — Line Interface Unit
• MQFP — Metric Quad Flat Pack
• DF — Distributing Frame
• Z — Zulu Time
• AEE — Agent Execution Environment
• DACS — Digital Access Carrier System

• SPI — Security Parameters Index
• WFT — Wireline Formation Test
• MOC — Maintenance and Operations Console
• MEAS — Measure
• GOS — Gerry Otis Simpson
• BFS — Broadcast File System
• WAWS — Washington Area Wideband System
• E2E — End-to-End
• AIS-L — Alarm Indication Signal - Line
• PCIA — Personal Communications Industry Association
• BCIX — Berlin Commercial Internet Exchange
• CDDI — Copper Distributed Data Interface
• ADM 3X — DS3 Add-Drop Multiplex
• CMAS — Cellular Management System
• LAPB — Link Access Protocol-Balanced
• SSU — Synchronization Supply Unit
• WTP — Wireless Transaction Protocol
• SM — Statistical Multiplexing
• GTM — Go to Meeting
• 4G — Fourth Generation
• CCSA — Common Control Switching Arrangement
• BSC — Base Station Controller
• INWATS — INward Wide Area Telecommunications Service
• RCF — Remote Call Forwarding
• VHM — Voice Health Monitor
• TMSI — Temporary Mobile Subscriber Identity
• VGC — Voice Grade Channel
• GOMP — Get Off My Phone
• BIC — Bus Interface Controller
• CMOS — Cellular Management Operation System
• TIA — Telecommunications Industry Association
• DCS — Defense Communications System
• ASA — Avaya Site Administration
• MBMS — Multimedia Broadcast/Multicast Service
• NSE — Network Software Environment
• DLC — Digital Leased Circuit
• PET — positron emission tomography
• CAM — Computer-Aided Manufacturing
• MPLS — Multi Protocol Label Switching
• COAM — Customer Owned And Maintained
• BCM — Bit Compression Multiplexer
• THL — Trans-Hybrid Loss
• PSO — Professional Services Organization
• KEK — Key Encrypting Key
• TVRO — Television Receive-Only
• E — Exchange
• JISC — Japanese Industrial Standards Committee
• CPC — Crosstalk Prevention Coding
• MOD — Modulo
• 100VG — 100 Voice Grade (IEEE 802.12 AnyLAN Standard)

• DMT — Discrete Multi-Tone
• RCH — Receive Channel
• PHY — Physical Layer
• LEED — Low-energy Electron Diffraction
• DLE — Digital Local Exchange
• WPKI — Wireless Public Key Infrastructure
• BANC — Broadband Access Network Coordination
• GSM — Global System for Mobile telecommunications
• APR — Alarm Processing Remote
• WSN — Wireless Sensor Network
• IXC — interexchange carrier
• IMPI — IP (Internet Protocol) Multimedia Private Identity
• BTS — Base Transceiver Station (cellular)
• SCORM — Shareable Content Object Reference Model
• IMTS — Improved Mobile Telephone Service
• DTW — Dynamic Time Warping
• HFC — Hybrid Fiber Coaxial
• AEIMP — Apple Event Interprocess Messaging Protocol
• VXML — Voice eXtensible Markup Language
• ICLD — Inter-Channel Level Difference
• CTIT — College of Telecommunications and Information Technology
• FOTS — Fiber Optical Transmission System
• CSL — component sublayer
• RLC — Radio Link Control
• MTS — message transport system
• RBT — Ring Back Tone
• CARS — Community Antenna Relay Service
• DCB — Digital Channel Bank (Sprint)
• REN — Ringer Equivalence Number
• TPSP — Third Party Service Provider
• MODEM — modulation and demodulation
• ACA — Automatic Circuit Assurance
• CCCI — Command, Control, Communications and Intelligence
• ICTA — Idaho Cable Telecommunications Association
• ASAS — All-Source Analysis System
• CLEC — Competitive Local Exchange Carrier
• BAF — Bellcore AMA (Automatic Message Accounting) Format
• VC — Virtual Circuit (ATM)
• DF — Direction Finding or Finder
• REG — range extender with gain
• GPBX — Global Private Branch eXchange
• DIP — Dialup Internet Protocol
• SQE — Signal Quality Error
• DCMES — Dublin Core Metadata Element Set
• CAL — Customer Access Line
• ACNA — Access Customer Name Abbreviation
• ISSI — Inter-Switching System Interface
• MVDS — Microwave Video Distribution System
• STD — Standard Deviation
• VCT — Variable Cam Timing

• ULP — Upper Layer Protocol
• AH — Authentication Header
• DOR — Detailed Outage Report
• CCSS6 — Common Channel Signaling System # 6
• LQR — Line Quality Report
• PTAM — Professional Telephone Answering Machine
• NAM — Numeric Assignment Module
• UDC — Universal Digital Channel
• PSLV — Polar Satellite Launch Vehicle (Indian Space Research Organization; India)
• VGF — Voice Grade Facility
• OODBMS — Object-Oriented Database Management Systems
• TRLR — Trailer
• ECDIS — Electronic Chart Display Information System
• CSA — Canadian Standards Association (like UL)
• CTTC — Centre Tecnològic de Telecomunicacions de Catalunya
• BTN — Billing Telephone Number
• D3 — Digital channel bank, Third generation
• SLF — Super Low Frequency
• FSK — Frequency Shift Keying
• RADARSAT — Radar Satellite
• RSL — Request and Status Links
• LORAN — Long Range Aid to Navigation System
• MMC — Microsoft Management Console (Microsoft)
• JDC — Japan Digital Cellular
• GERAN — GSM (Global System for Mobile communications) Edge Radio Access Network
• MTA — Message Transfer Agents (Internet)
• AAL2 — ATM (Asynchronous Transmission Mode) Adaptation Layer 2
• VVP — Versatile Voice Processing
• VOFR — Voice Over Frame Relay
• CEPT — Conference of European Posts and Telecommunications
• RSN — Regional Service Network
• UBT — Universal Backend Tester
• SLC — Service Level Contract
• VPC — Virtual Path Connection (ATM)
• SMMR — Scanning Multichannel Microwave Radiometer
• DAS — Data Acquisition System
• LUNT — Line Unit Network Termination
• DPDCH — Dedicated Physical Data Channel
• DTS — Digital Terminal Systems
• BHA — Busy Hour Attempts
• DIAG — Diagnostics
• DPT — Dial Pulse Terminate
• PT — Payload Type (ATM)
• 4WE&M — Four-Wire Ear and Mouth
• LTU — Line Terminating Unit
• TRAC — Totally Reconfigurable Analog Circuit
• UMTS — Universal Mobile Telecommunication System
• SYSADM — System Administrator
• BAC — Bar Calls
• ULC — Universal Line Card

• WDF — Wireless Data Forum
• DQR — Directory enQuiry Restricted
• PFE — Power Feed Equipment
• ACMA — Atlantic Cable Maintenance Agreement
• LAC — Line Assignment Center
• ILETS — Idaho Law Enforcement Telecommunication System
• LCGN — Logical Channel Group Number
• BRAN — Broadband Radio Access Network
• MDCP — Media Device Control Protocol
• NTSC — National Television Standards Committee
• CP — Cell Phone
• TSM — Transaction State Machine
• APTG — Asia Pacific Telecom Group
• STD — Secondary Telecom District
• STE — Syrian Telecommunications Establishment
• AIS-P — Alarm Indication Signal - Path
• DRTT — Dial Repeating Tie Trunk
• CFS — Call for Service
• FIC — Flight Information Center
• CLI — Calling Line Identification
• OST — Office of Science and Technology
• DDS — Dataphone Digital Service (AT&T)
• CNE — Certified Novell Engineer
• RPCU — Radio Port Control Unit
• LRB — Loop Reverse Battery
• DE — Discard Eligible
• CUSA — Central Urban Service Area
• FPLMTS — Future Public Land Mobile Telecommunications System
• DFRI — Datacom Reference Frame Input
• PTCL — Pakistan Telecommunication Company Ltd
• DSU — Digital Service Unit
• MIS — Miscellaneous
• IS — Integrated Services
• ASP — Active Signaling Protocol
• NMC — Nortel Matra Cellular
• GSM — Groupe Speciale Mobile
• JWP — Joint Working Party
• RAI — remote alarm indication
• ECTF — Enterprise Computer Telephony Forum
• DVCC — Digital Verification Color Code
• CPS — Cycles Per Second (now Hertz)
• CNID — Calling Number Identification Display
• TTIL — Team Telecom International Ltd.
• RDSS — Radio Determination Satellite Service
• TAE — Terminal Adapter Equipment
• NARC — Non-Automatic Relay Center
• DORA — EV-DO (EVolution-Data Optimized) standard Revision A
• ACL — Asynchronous Connection-less Link
• CODASYL — COnference on DAta SYstems Languages
• ISD — International Subscriber Dialling

• PN — Public Network
• TL — Telephone Lead
• PNA — Parallel Network Architecture
• NMF — Network Management Forum
• TSAU — Time Slot Access Unit
• MUSIC — MUltiple SIgnal Classification
• GRX — GPRS Roaming Exchange
• SASL — Simple Authentication and Security Layer
• CIS — Communications and Information Systems
• HSCSD — High-Speed Circuit-Switched Data
• DLIS — Directory Listing Inquiry System
• ATL — Advanced Technology Laboratory
• 2G — Second-generation mobile telephone system
• RA — Return Alarm
• ACOU — Additional Call Offering Unrestricted
• DSP — Domain Specific Part
• EGPRS — Enhanced General Packet Radio Service
• RDTD — Restricted Differential Time Delay
• CL — cell loss
• T&R — Tip and Ring
• WLNP — Wireless Local Number Portability
• ATR — Advanced Telecommunications Research Institute
• LL — Lower Layer
• JMA — Japanese Meteorological Agency
• BMAS — Business Management System
• PPCH — Packet Paging Channel
• VAD — Voice Activity Detection
• W-CDMA — Wideband Code Division Multiple Access
• CAE — Common Application Environment
• LSP — Label Switched Path
• IRAC — Interdepartment Radio Advisory Committee
• ISO — Independent System Operator (US) (see also TSO) Responsible for grid management, but does not own assets. (electricity)
• NECA — National Exchange Carrier Association
• DMI — Digital Multiplex Interface
• TCL — Transverse Conversion Loss
• UPS — Un-interruptable Power Supply
• ECAN — Echo Cancellation
• DAS — Distributed Antenna System
• WDRM — Wireless Design Reference Manual
• AGPS — Assisted Global Positioning System
• CMP — Connection Management Procedures
• BAOC — Barring of All Outgoing Calls supplementary service
• PSC — Picture Start Code
• 3GSM — Third-generation Global System for Mobile (communications)
• TR — Temporal Reference
• WDSL — Wireless Digital Subscriber Line
• MMC — Minimum Monthly Charge
• ISM — Interstellar Medium
• CATI — Computer-Assisted Telephone Interviewing
• PWM — Pulse width modulation

• CD — Committee Draft
• BCST — Broadcast
• CCS — Common Command Set
• WDS — Wireless Distribution System
• PTM — Packet Transport Mode
• SGCP — Simple Gateway Control Protocol
• BTL — Bell Telephone Laboratories, Inc.
• RDF — Remote Distribution Frame
• LFTYR — Ley Federal de Telecomunicaciones y Radiodifusión
• PTO — U.S. Patent And Trademark Office
• ACRE — Authorization and Call Routing Equipment
• RANAP — Radio Access Network Application Part
• UR — User Rate
• NPSI — Network Packet Switching Interface
• ABATS — Automatic Bit Access Test System
• MM — Multimode (fiber optic cable)
• USI — User System Interface
• SAP — Service Advertising Protocol
• VDV — Voice/Data/Video
• ACE — Authentication Encryption
• CBS — Common Battery Signaling
• RWIN — Receive Window
• RS — Receive Signature
• CSCC — coordinated state change control
• ADC — Advanced Data Control
• DPCM — Differential Pulse Code Modulator
• UBL — Universal Bluetooth Link
• UPC — Usage Parameter Control
• ASTE — Advanced Systems and Telecommunications Equipment
• QR — Quality record
• EIR — Excess Information Rate
• BORSCHT — Battery feed, Overvoltage protection, Ringing, Signaling, Coding, Hybrid, and Testing
• LSMS — Local Service Management System
• DMT — Digital-Discrete Multi-Tone
• DTC — Department of Telecommunications and Cable
• HFT — Human Factors in Telecommunications
• SVC — Signaling Virtual Channel
• NQA — Niveau de Qualite Acceptable
• WITS — Web Interface for Telescience
• ETB — Empresa de Telecomunicaciones de Bogotá
• BTU — Basic Transmission Unit
• NETBIOS — Network Basic Input-Output System
• FGDC — Federal Geographic Data Committee's
• ROF — Reformat on the Fly
• BHCA — Busy Hour Call Attempts
• ATMS — automatic transmission measuring system
• BEAR — Billed Entity Applicant Reimbursement
• WIPI — Wireless Internet Platform for Interoperability
• MHD — Maximum Hour Demand
• ESG — Enhanced Service Gateway

• HBH — Hop-By-Hop
• EDGE — Enhanced Data for GSM (Global System for Mobile communication) Evolution
• CT — Control terminal
• ITAD — Integrated Telephone Answering Device
• STN — Station Casinos, Inc.
• DMF — Distributed Messaging Fabric
• EA — Emergency Action (JOC)
• STE — Software Test Environment
• MHL — Mobile High-definition Link
• CAIRO — Communications Audio Interface for Remote Operations
• STAN — Supply of Telstra Account Number
• BUS — Broadcast and Unknown Server
• FWS — Fixed Wireless Services
• DQDB — Distributed Queue Double Bus
• EC — Echo Cancelling
• ITOC — Independent Telephone Operating Company
• RBOC — Regional Bell Operating Company (Baby Bell)
• SMDR — station message detail recording
• CDPD — Cellular Digital Packet Data
• RLA — Received Level Average
• WWAN — wireless wide-area network
• FTS — Federal Telecommunications System
• ILETS — International Law Enforcement Telecommunications Seminar
• TWX — Teletypewriter Exchange (Telex)
• SINS — Ship’s Inertial Navigation System
• MEID — Mobile Equipment Identifier
• ACTS — Automated Coin Toll System
• KTS — Key Telephone System
• LEC — Liquid Encapsulated Czochralski
• MIC — Management Integration Consortium
• ONE — Other Network Entity
• SUBT — Subscriber Terminal
• DTU — Data Terminal Unit
• ATSC — Advanced Television Systems Committee
• AMC — Adds, Moves and Changes
• FLN — Fixed Line Network
• AUSPI — Association of Unified Telecom Service Providers of India
• DA — decanoic acid
• SCO — Synchronous Connection Oriented
• NSP — National Signaling Point
• DI — Document Index
• DCS — Digital Cross-connect Switch
• VGCP — Voice Grade Channel Processor
• ARQ — Admission Request
• IPCU — iPhone Configuration Utility
• TACSIM — Tactical Simulation (Simulator)
• BATM — Basic Telecommunication Access Method
• MT — maintenance
• NSDI — National Spatial Data Infrastructure
• WTIA — Wireless Technology Industry Association

• CVSD — Continuous Variable Slope Detection
• IVI — Intel Video Interactive
• AA — Auto-Answer
• COB — Change Of Billing
• JSC — Joint Scientific Committee (ICSU, WCRP, and WMO)
• IDC — Information Distribution Company
• SVW — Sioux Valley Wireless
• BBCR — BroadBand Communications Research
• HTO — Hellenic Telecommunications Organisation
• RPV — Resource Property Value
• UTL — United Telecom Limited
• QPA — Quality Performance Analysis
• RLS — Recursive Least Squares
• PTT — Post Telegraph and Telecommunications
• NDIS — Network Driver Interface Specification (Microsoft Windows NT)
• WTA — Western Telecommunications Alliance
• CDO — Community Dial Office
• IQ — In-phase and Quadrature
• CTS — Call Tracking System
• AFI — Authority and Format Identifier
• GTXC — Global Telephone Exchange Carrier
• EDT — European Deaf Telephone
• MSC — Mobile Switching Center
• COI — Community of Interest
• ULF — Ultra Low Frequency
• TIMS — Transmission Impairment Measurement System
• BGP4 — Border Gateway Protocol 4
• SMT — station management (protocol)
• WTA — Wireless Telephony Application
• TPC — The Phone Company
• LETS — Line Efficiency Tracking System
• ISMI — International mobile subscriber identity
• EF&I — Engineering, Furnishing and Installation
• SMASE — Systems Management Application Service Element
• AQP — Association for Quality and Participation
• WLAP — Wireless LAN (Local Area Network) Access Point
• LTU — Line Termination Unit
• PR — Preference
• WRED — Weighted Random Early Detection
• WBA — Wireless Broadband Access
• TCM — Tandem Connection Maintenance
• CUG — Closed Users Group
• MAHO — Mobile Assisted Handoff
• WICD — Wireless Interface Connection Daemon
• ALC — Automatic Line Controller
• ATU-R — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Remote terminal end
• SNIX — Single Noise Interference Xterminator
• GVPN — Global Virtual Private Network
• CCC — Credit Card Calling
• CPCI — Compact Peripheral Component Interconnect

• BASH — Bandwidth Sharing
• DRTL — Dial Repeating Tie Line
• SYNC — Synchronization
• PRE — Preliminary
• VLP — Very Low Power
• RSS — Received Signal Strength
• CHT — Active
• MSG — Management Steering Group
• NRI — Net Radio Interface
• DOV — Data-Over-Voice
• VAN — Value-Added Network
• CASE — Computer-Aided Software Engineering
• PPV — Pay-Per-View
• SVGA — Super VGA
• TAU — Test Access Unit
• IPC — Initial Paging Channel
• LSF — Line Spread Function
• LBX — Low Bandwidth X