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Computing & IT >> Telecom Abbreviations

Look through 4999 acronyms and abbreviations related to Telecom:

• IPB — Invision Power Board
• XFMR — Transformer
• DOE — Distributed Object Environment
• CSR — Customer Service Representative
• CONG — Congestion message
• DDRS — Dynamic Data Rate Selection
• APR — Annual Percentage Rate
• IQ — Intelligence Quotient
• ETA — Estimated Time of Arrival
• LAN — Local Area Network
• EBITDA — Earnings before Interest, Taxes, Depreciation and Amortization
• GFSK — Gaussian Frequency Shift Keying
• FTP — File Transfer Protocol
• MLS — Microwave Landing System
• ECG — Electrocardiogram
• CT — Computed Tomography
• ECU — Electronic Control Unit
• YTD — Year To Date
• YMMV — Your Mileage May Vary
• FDIC — Federal Deposit Insurance Corporation
• ISAR — Inverse Synthetic-Aperture Radar
• DCE — Data Circuit-terminating Equipment
• CUG — Closed User Group
• MAN — Metropolitan Area Network
• RFQ — Request For Quotation
• BVR — Beyond Visual Range
• ISO — In Search Of
• IAMAI — Internet and Mobile Association of India
• MBR — Master Boot Record
• WWW — World Wide Web
• ROM — Read-Only Memory
• CSA — Canadian Space Agency
• DND — Do Not Disturb
• IRC — Internet Relay Chat
• F2F — Face To Face (also Meeting In Person)
• TEMIP — Telecommunications Management Information Platform
• SAR — Search And Rescue
• CDR — Critical Design Review
• DBMS — Database Management System
• IT — Information Technology
• WML — Wireless Markup Language
• VIP — Very Important Person
• ESA — European Space Agency
• QC — Quality Control
• CSMA/CA — Carrier Sense Multiple Access/Collision Avoidance
• ASAP — As Soon As Possible (pronounced AY-sap)
• DBORS — Data Base of Records
• EAP — Employee Assistance Program
• DFD — Displaced Frame Difference
• BUR — Bandwidth Usage Redundancy

• UK — United Kingdom of Great Britain and Northern Ireland
• FAR — Federal Aviation Regulation
• ISO — International Organization for Standardization
• AFAIK — As Far As I Know
• PDR — Preliminary Design Review
• STS — Space Transportation System
• CPE — Customer Premises Equipment
• AATSR — Advanced Along-Track Scanning Radiometer
• LRJ — Location Reject
• WTG — Way To Go
• LASER — Light Amplification By Stimulated Emission Of Radiation (cf. Maser)
• VM — Voice Mail
• EDI — Electronic Data Interchange
• RPI — Retail Price Index
• DWDM — Dense Wavelength Division Multiplexing
• NFS — Network File System
• CD — Compact Disc
• ACE — Access Control Entry
• EIS — Executive Information System
• CY — Calendar Year
• CV — Curriculum Vitae
• Y2K — Year 2000
• ATTN — Attention
• ACH — Automated Clearing House
• MB — Megabyte
• MMS — Multimedia Messaging Service
• FET — Field Effect Transistor
• ANSI — American National Standards Institute, Inc.
• IRL — In Real Life
• ACC — Adaptive Cruise Control
• CS — Computer Science
• ABI — Application Binary Interface
• ALC — Automatic Level Control
• APT — Automatic Picture Transmission
• ADD — Addendum
• IRR — Internal Rate of Return
• RWR — Radar Warning Receiver
• SDMA — Space Division Multiple Access
• PDH — Plesiochronous Digital Hierarchy
• DSA — Digital Signature Algorithm
• AC — Alternating Current
• ATM — Automatic Teller Machine
• ISP — Internet Service Provider
• DDL — Data Definition Language
• DWDM — Dense Wavelength-Division Multiplexing
• AES — Auger Electron Spectroscopy
• EW — Electronic Warfare
• EFF — Electronic Frontier Foundation
• AAC — Advanced Audio Coding
• OIC — Oh I See

• CCB — Change Control Board
• CCSDS — Consultative/Consultative Committee for Space Data Systems
• ADM — Add/Drop Multiplexer
• BTW — By The Way
• AES — Advanced Encryption Standard
• QI — Quality Improvement
• AUP — Acceptable Use Policy
• ASA — American Standards Association
• CEO — Chief Executive Officer
• GPRS — General Packet Radio Service
• SP — Service Provider
• DAC — Discretionary Access Control
• HTTP — Hypertext Transfer Protocol
• ACFQ — Absence Compensation Fair Queuing
• CPU — Central Processing Unit
• SAN — Storage Area Network
• PDA — Personal Digital Assistant
• DME — Distance Measuring Equipment
• ABR — Available Bit Rate
• COB — close of business (End of duty day)
• SCSI — Small Computer System Interface
• GSM — Global System for Mobile Communications
• DFS — Distributed File System
• ACD — Automatic Call Distributor
• CU — Control Unit
• RNC — Radio Network Controller
• AC — Access Control
• TQM — Total Quality Management
• WAN — Wide Area Network
• CDR — Call-Detail Record
• LCD — Liquid Crystal Display
• NIC — Network Interface Card
• CGI — Common Gateway Interface
• AVHRR — Advanced Very High Resolution Radiometer  
• BPM — Beats Per Minute
• ASR — Airport Surveillance Radar
• NPI — New Product Introduction
• ADR — Address
• SMTP — Simple Mail Transfer Protocol
• WWW — World Weather Watch
• OEM — Original Equipment Manufacturer (usually in reference to car parts)
• CBC — cipher block chaining
• FEMA — Federal Emergency Management Agency
• ATF — Advanced Tactical Fighter
• AP — Application Protocol
• EOM — End Of Message
• LLC — Limited Liability Company
• VR — Virtual Reality
• ATA — Area Transportation Authority
• SCC — Standards Council of Canada

• IP — Internet Protocol
• QFSK — Quadrature Frequency Shift Keying
• VAT — Value Added Tax
• BS — Base Station
• SYN — Synchronous
• JAXA — Japan Aerospace Exploration Agency
• RFP — Request For Proposal
• RU — Are You?
• RPC — Remote Procedure Call
• S X S — Step-by-Step
• SD — Standard Deviation
• NOS — Network Operating System
• GIS — Geographic Information System
• WEP — Wired Equivalent Privacy
• R&D — Research & Development
• IM — Instant Message
• RF — Radio Frequency
• CIM — Corporate Information Management
• TCB — Trusted Computing Base
• DB — Decibel
• RFC — Request For Comment
• APIC — Advanced Programmable Interrupt Controller
• LRU — Line Replaceable Unit
• MST — Mountain Standard Time
• BBS — Bulletin Board Service
• ASME — American Society of Mechanical Engineers
• TC — Telephone Call
• AIS — Automated Information System
• ISO — Infrared Space Observatory
• FAA — Federal Aviation Administration
• ATM — Adobe Type Manager
• RM — Resource Management
• CB — Call Back
• IMPACT — Integrated Manufacturing Precision Assembly Cellular Technology
• TCP — Transmission Control Protocol
• DIT — Directory Information Tree
• MOU — Memorandum of Understanding (an MOU between Food & Drug Administratin and a regulatory agency in another country allows mutual recognition of inspections)
• ISRO — Indian Space Research Organisation
• ME — Mobile Equipment
• SIG — Special Interest Group
• C4I — Command, Control, Communications, Computers, & Intelligence
• MS — Message Store
• CC — Call Control
• LCP — Link Control Protocol
• POC — Point Of Contact
• GRE — Generic Routing Encapsulation
• WWW3 — World Wide Web Consortium
• TM — Technical Manual
• Q&A — Question & Answer
• MSN — Microsoft Network

• CFE — Contractor-Furnished Equipment
• CIO — Chief Information Officer
• CPT — Carriage Paid To
• SQA — Software Quality Assurance
• TV — Television
• MIC — Message Integrity Check
• FX — Foreign Exchange
• I/O — Input/Output
• NIH — Not Invented Here
• TAC — Technical Assistance Center
• FCW — Federal Computer Week
• AD — Active Directory
• ATM — Asynchronous Transfer Mode
• MRI — Magnetic Resonance Imaging
• SLA — Service Level Agreement
• UAS — Unavailable Seconds
• PDT — Pacific Daylight Time
• DSA — Directory System Agent
• MS — Mobile Station
• YP — Yellow Pages
• WDM — Wavelength Division Multiplexing (fiber optics)
• CR — Carriage Return
• D-H — Diffie-Hellman
• NATO — North Atlantic Treaty Organisation
• MOS — Model Output Statistics
• EC — European Commission
• TS — Technical Specification
• BTU — British Thermal Unit
• PAR — Precision Approach Radar
• CDS — Cell Directory Service
• AT — Access Tandem
• LLC — Logical Link Control
• PAL — Programmable Array Logic
• MPI — Message Passing Interface
• SLIP — Serial Line Interface Protocol
• PLD — Programmable Logic Device
• FC — Fibre Channel
• UDP — User Datagram Protocol (FDDI related)
• PLMN — Public Land Mobile Network
• IS — Intermediate System
• DMSP — Defense Meteorological Satellite Program (U.S.)
• TBD — To Be Decided
• RCU — Remote Control Unit
• M — Meter
• UAV — Unmanned Aerial Vehicle
• OSS — Operational Support System
• DLC — Digital Loop Carrier
• EGA — Enhanced Graphics Adapter
• ATS — applications technology satellite
• JV — Joint Venture

• AF — Audio Frequency
• ABC — activity based costing
• F — Fellow
• 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.
• CMI — Computer Managed Instruction
• ARPA — Advanced Research Projects Agency (made early internet)
• DTE — Data Terminal Equipment
• VM — Virtual Machine
• COMJAM — Communications Jamming
• SEM — Space Environment Monitor
• COR — Carrier Operated Relay
• SEC — Software Engineering Center
• QOS — Quality of Service
• CIS — Commonwealth of Independent States
• CM — Configuration Management
• S-BCCH — Short Message Service Broadcast Control Channel
• CC — Carbon Copy
• IPO — Initial Public Offering
• VVX — Voice and Video eXchange
• SDR — Special Drawing Rights
• DES — Data Encryption Standard
• SMS — Short Message Service
• IW — Information Warfare
• BECN — Backward Explicit Congestion Notification
• MAC — Message Authentication Code
• CAE — Computer-Aided Engineering
• JIS — Japanese Industrial Standard
• VOP — Voice Over Packet
• HW — Hardware
• BCC — Blind Carbon Copy
• LSR — Local Service Request
• DAM — Diagnostic Acceptability Measure
• QMS — Quality Management System
• Z — Zero
• SGML — Standard Generalized Markup Language
• BPRZ — Bipolar Return-to-Zero
• RCC — Rescue Coordination Center
• CPM — Critical Path Method
• TNSTAAFL — There's No Such Thing As A Free Lunch
• LCN — Logical Channel Number
• DIS — Distributed Interactive Simulation
• UHF — Ultra High Frequency (300-3000 MHz; 1m-10cm)
• THX — Thanks
• SA — Scientific American
• DHCP — Dynamic Host Configuration Protocol
• USB — Universal Serial Bus
• SSM — Source-Specific Multicast
• NI — Network Interface
• TPDU — Transport Protocol Data Unit
• UAN — Universal Access Number

• EAP — Extensible Authentication Protocol
• CAC — Carrier Access Code
• WB — Welcome Back
• MS — Management System
• CCIS — Common Channel Interoffice Signaling
• CABS — Carrier Access Billing System
• DS — Digital Signal
• DPC — Destination Point Code
• MHS — Microwave Humidity Sounder
• EAS — Extended Area Service
• MF — Medium Frequency
• SCP — Service Control Point
• TEC — Total Electron Content
• FXO — Foreign Exchange Office
• ISS — International Space Station
• VDS — Variable Depth Sonar
• E — Energy
• AR — Access Rate
• FFT — Fast Fourier Transform
• EDS — Electronic Data Systems Corporation
• RT — Remote Terminal
• ECN — Explicit Congestion Notification
• PDF — Portable Document Format (created by Adobe Acrobat)
• IP — Intelligent Peripheral
• AM — Amplitude Modulation
• ZIP — Zone Information Protocol
• ACL — Access Control List
• ICT — Information and Communication Technology
• PO — Purchase Order
• PE — Polyethylene
• ATSR — Along-Track Scanning Radiometer
• CRL — Certificate Revocation List
• MP — Multilink Protocol
• ICMP — Internet Control Message Protocol
• ASR — Access Service Request
• SM — Senior Member
• AGP — Accelerated Graphics Port
• WS — Workstation
• WPS — Wireless Priority Service
• NMT — Nordic Mobile Telephone
• A-KEY — Authentication key
• 100BASE-T2 — 100 Megabits per Second, Baseband, Two-pair Category 3 UTP cables
• MC — Message Center
• AFP — AppleTalk Filing Protocol
• CO — Certificate of Origin
• BACP — Bandwidth Allocation Control Protocol
• AM — Ante Meridian
• HDLC — High-Level Data Link Control
• JSC — Johnson Space Center (Houston, TX)
• DLR — Design Layout Record

• LED — Light-Emitting Diode
• MD — Mediation Device
• CS — Cable Select
• ATC — Air traffic control
• AE — Application Entity
• WBS — Work Breakdown Structure
• DC — Direct Current
• VB — Visual Basic
• OMG — Object Management Group
• PNG — Portable Network Graphics (graphic file standard/extension)
• CBCU — Centralized Broadband Control Unit
• LEO — Low Earth Orbit (satellite communications)
• CERT — Computer Emergency Response Team
• BRA — Basic Rate Access
• X-BAR — Crossbar telephone exchange
• RAD — Rapid Application Development
• RTS — Request To Send
• B-ICI — Broadband Inter-Carrier Interface
• EVP — Executive Vice President
• MSE — Mobile Subscriber Equipment
• SME — Subject Matter Expert
• GPS — Global Positioning System (ex-NAVSTAR)
• RFS — Request For Service
• PVT — Private
• SPI — Service Provider Interface
• ADPE — Automatic Data Processing Equipment
• TN — Telephone Number
• DOA — dead on arrival
• OTN — Optical Transport Network
• VHF — Very High Frequency
• WB — Write Back
• ADF — Automatic Direction Finder
• SDD — Software Design Document
• AT — Advanced Technology
• MSU — Microwave Sounding Unit
• MDA — Monochrome Display Adapter
• PM — Preventive Maintenance
• AME — Amplitude Modulation Equivalent
• AMT — Amount
• PCB — printed circuit board
• UA — User Agent
• SVC — Switched Virtual Connection
• FA — Functional Area
• CT — Computer Telephony
• BT — British Telecommunications
• NSA — National Security Agency
• SEI — Software Engineering Institute
• SAS — Statistical Analysis System
• NYSE — New York Stock Exchange
• NOTAM — Notice to Airmen

• TLS — Transport Layer Security
• LF — Low Frequency
• VLL — Virtual Leased Line
• STK — Satellite Tool Kit
• NSF — National Sanitation Foundation
• AOA — Angle Of Arrival
• CIM — Common Information Model
• BSD — Berkeley Software Distribution
• UR — Your
• SAN — System Area Network
• RCV — Receive
• CATV — Community Antenna Television
• VOD — Video On Demand
• ADT — Abstract Data Type
• MS — Millisecond
• ATCRBS — Air Traffic Control Radar Beacon System
• DNS — Domain Name System
• IPX — Internetwork Packet Exchange
• RIP — Routing Information Protocol
• M — Management
• EST — Eastern Standard Time
• AU — Audio Unit
• ACM — Association for Computing Machinery
• DCP — Design Change Package
• SCN — Switched Circuit Network
• X-ON — Transmitter On
• MTBF — Mean Time Before Failure
• DOM — Document Object Model
• PUHU — Pick Up Hang Up
• OBO — Or Best Offer
• OPC — Originating Point Code
• CW — Continuous Wave
• RFI — Radio Frequency Interference
• AM — Activity Manager
• EPA — Environmental Protection Agency (US)
• SBC — Session Border Controller
• STP — Spanning Tree Protocol
• PT — Project Team
• BT — BlueTooth
• Y — Yes
• API — Application Programming Interface
• MSR — Microwave Scanning Radiometer
• ZIP — Zone Improvement Plan
• TRM — Technical Reference Model
• ARPANET — ARPA Network
• NIC — Network Information Center
• PWD — Password
• AGC — Automatic Gain Control
• CA — Certificate Authority
• CGI — Computer-Generated Imagery

• ASTM — American Society for Testing and Materials (Philadelphia, Pennsylvania)
• IN — Intelligent Network
• DA — Destination Address
• ARC — Army Reuse Center
• FR — Frame Relay
• OM — Old Man
• SCTP — Stream Control Transmission Protocol
• ASCII — American National Standard Code for Information Interchange
• ARPU — Average Revenue Per User
• NESDIS — National Environmental Satellite, Data, and Information Service
• HF — High Frequency
• NMSE — Normalized Mean Square Error
• APC — American Power Conversion
• LZ — Landing Zone
• NTFS — New Technology File System
• MOL — Manned Orbiting Laboratory
• CNM — Customer Network Management
• X-OFF — Transmitter Off
• URI — Uniform Resource Identifier
• TBD — To Be Determined
• DCE — Distributed Computing Environment
• AMI — Advanced Metering Infrastructure
• IS — International Standard
• TB — Terabyte
• IETF — Internet Engineering Task Force
• TTYL — Talk To You Later (Internet Slang)
• VAC — Vacant
• MDA — Model Driven Architecture
• BBS — Bulletin Board System
• CAN — Campus Area Network
• DT — DWDM (Dense Wavelength Division Multiplexing) Terminal
• SVC — Scalable Video Coding
• MCU — Multipoint Control Unit
• DTX — Discontinuous Transmission
• FE — Far End
• NIS — Network Information Service
• ECT — Explicit Call Transfer
• Y — Yttrium
• AE — Account Executive
• PCI — Peripheral Component Interconnect
• COM — Component Object Model
• BCD — Binary-Coded Decimal
• MOD — Modify
• ISA — Industry Standard Architecture
• CUL — See You Later
• WG — Working Group
• ADEOS — ADvanced Earth Observing Satellite (Japan)
• BRB — Be right back
• DX — Duplex
• NEC — National Electrical Code

• DID — Digital Information Display
• AS — Autonomous System
• ES — Errored Second
• BS — Beam Splitter
• NCS — National Communications System
• EAC — Engineering Accreditation Commission
• RFO — Reason For Outage
• CSMA/CD — Carrier Sense Multiple Access with Collision Detection
• P&L — Profit and Loss statement
• CIA — Central Intelligence Agency
• ABET — Accreditation Board for Engineering and Technology, Inc.
• NMS — Network Management System
• ACE — Advanced Computing Environment
• ECAC — European Civil Aviation Conference
• PPM — parts per million
• EBCDIC — Extended Binary Coded Decimal Interchange Code (pronounced Eb-see-dik) (cf. BCD)
• ARG — Argument
• AFS — Andrew File System
• VT — Vacuum Tube
• TE — Traffic Engineering
• DUP — Duplicate
• ERT — Emergency Response Team
• CAB — Conformity Assessment Body
• CSAT — Customer Satisfaction
• FCA — Free Carrier
• GDS — Global Distribution System
• AEW — Airborne Early Warning
• TSR — Telecommunications Service Request
• ADSL — Asymmetric Digital Subscriber Line
• ACK — ACKnowledgment
• WACN ID — Wide Area Communications Network IDentifier
• PRF — Pulse Repetition Frequency
• USD — United States Dollar
• STM — Short Term Memory
• NNM — Network Node Manager
• H323 — ANSI standard for format over IP
• UL — Uplink
• GUI — Graphical User Interface (goo-ey)
• ISI — Inter-Symbol Interference
• B3ZS — bipolar 3-zero substitution
• SVD — Singular Value Decomposition
• FITS — Flexible Image Transport System
• CIC — Circuit Identification Code
• WMAN — Wireless Metropolitan Area Network
• RA — Risk Analysis
• RM — Regional Manager
• DC — Display Controller
• RH — Relative Humidity
• OAS — Organization of American States
• HSD — High Speed Data

• MLS — Multiple Listing Service
• MOB — Mobile
• COO — Cost of Ownership
• IVR — Interactive Voice Response (telephone technology)
• TG — Task Group
• NA — Not Applicable
• ZDBOP — Ziff-Davis Benchmark Operation
• DEC — Decimal
• P — Predicted
• RDBMS — Relational Database Management System
• SPC — Stored Program Control
• SWAG — Scientific Wild Ass Guess
• FUP — Fair Use Policy
• VIRUS — Vital Information Resources Under Siege
• RACON — Radar Beacon
• TLC — The Learning Channel
• SAS — Special Access Surcharge
• LD — Long Distance
• CG — Coast Guard
• UAX 14 — Unit Automatic eXchange type 14
• HSDPA — High-Speed Downlink Packet Access
• PAN — Personal Area Network
• PDS — Planetary Data System
• OC — Optical Carrier
• TWT — Traveling Wave Tube
• MRC — Monthly Recurring Charge
• SIL — Speech Interference Level
• METRO — Metropolitan
• RT — Response Time
• DAP — Directory Access Protocol
• PS — Product Specification
• EMG — Electromyogram
• TI — Time Interval
• TOP — Technical Office Protocol
• PMA — Physical Medium Attachment
• FDL — Facility Data Link
• FE — Finite Element
• CB — Common Battery
• CF — Compact Flash
• DL — Digital Library
• LF — Line Feed
• A — Anode
• SF — Single Frequency
• TCP/IP — transmission control protocol/internet protocol
• ACT — Activity
• OMS — Optical Multiplex Section
• PTA — Pakistan Telecommunication Authority
• VOL — Volume
• PDS — Protected Distribution System
• AOI — Area Of Interest

• BIS — Bureau of Indian Standards
• LEN — Line Equipment Number
• XA-FR — Exchange Access Frame Relay
• Q — Quadrature
• DC — Disconnected
• COQ — Cost Of Quality
• LP — Low Pressure
• ASR — Automatic Speech Recognition
• PDN — Public Data Network
• AS — Access System
• CBT — Computer Based Training
• IIS — Internet Information Services
• TNYWR — The Number You Will Receive
• DAL — Dedicated Access Line
• IS — Information System
• PD — Public Domain
• MCD — Magnetic Circular Dichroism
• BG — Background
• SD — Software Development
• ACK — Acknowledge (telecommunications; Cf. NAK)
• C-NBAP — Common Node B Application Part
• PECVD — Plasma-Enhanced Chemical Vapor Deposition
• CEV — Controlled Environment Vault
• APM — Advanced Power Management
• PGA — Programmable Gate Array
• EPR — Electron Paramagnetic Resonance
• PPB — parts per billion (109)
• LU — Logical Unit
• LEP — Large Electron Positron
• EX — Exercise
• FCP — Fibre Channel Protocol
• LPC — Linear Predictive Coding
• AIN — Advanced Intelligent Network
• DTR — Data Terminal Ready
• NAS — Network Access Server
• DCN — Disconnect
• ROSAT — Roentgen Satellite
• ESS — Electronic Switching System
• ETS — European Telecommunication Standard
• DDS — Digital Data Service
• SML — Service Management Layer
• QA — Center for Quality Assurance in International Education
• AML — Amplitude Modulated Link
• E — Echo
• TE — Test Equipment
• YGWYPF — You Get What You Pay For
• MCSD — Microsoft Certified Solution Developer
• DVP — Digital Voice Privacy
• VC — Virtual Channel
• AFC — Automatic Frequency Control

• CER — Cell Error Ratio
• PE — Probable Error
• CCM — counter-countermeasure
• CATV — Cable Television
• ACE — Adaptive Communication Environment
• ATA — Analog Telephone Adapter
• NA — Network Adapter
• UP — User Profile
• BOC — Bell Operating Company
• NPV — Net Present Value {economics}
• AIS — Alarm Indication Signal
• ASQC — American Society for Quality Control's
• W3C — World Wide Web Consortium
• EU — European Union (1994; formerly referred to as the EEC or EC)
• FAA — Federal Aviation Agency
• LT — Less Than
• EEC — European Economic Community (predecessor of the European Union|EU)
• ECP — Encryption Control Protocol
• JPL — Jet Propulsion Laboratory (California Institute of Technology) (NASA)
• UPS — Ultraviolet Photoelectron Spectroscopy
• CO — Central Office
• MVS — Multiple Virtual Storage
• PG — Page
• GATT — General Agreement on Tariffs and Trade (government)
• DCS — Digital Cellular System
• RDP — Radar Data Processing
• BSS — Basic Service Set
• BST — British Summer Time
• C — Cost
• AIR — Account Information and Refill
• TOS — Type Of Service
• 9 — Nine
• AMI — Alternate Mark Inversion
• BS — Broadcast Satellite
• SAR — Specific Absorption Rate
• CTS — Clear To Send
• TSB — Telecommunication Standardization Bureau
• ACR — Attenuation Crosstalk Ratio
• RDY — Ready
• AUD — Audit
• TCR — Temperature Coefficient of Resistance
• IV — Initialization Vector
• TE — Terminal Equipment
• CU — See You
• MCA — Micro Channel Architecture
• IDT — Integrated Digital Terminal
• CDC — Connected Device Configuration
• IT — Integration Test
• VOA — Voice Of America
• SBC — Southwestern Bell Corporation

• DSC — Differential Scanning Calorimetry
• OSPF — Open Shortest Path First (ATM)
• BS — Backing Store
• SIM — Subscriber Identity Module
• BBM — Blackberry Messenger
• PIC — Peripheral Interface Controller
• SA — Source Address
• CU — Channel Unit
• BIP — Band Interleaved by Pixel
• OCR — Optical Character Recognition
• BER — Bit-Error Rate
• ADL — Advanced Distributed Learning
• BYOD — Bring Your Own Device
• E-LEAD — Ear Lead
• SHF — Super High Frequency
• ADC — Analog-Digital Converter
• SIL — Silence
• AT&T — American Telephone & Telegraph
• OTS — Optical Transmission Section
• PGP — Pretty Good Privacy (encryption)
• RT — Radiotelephone
• AEC — Architecture, Engineering, Construction
• BERT — Bit Error Rate Tester (telecommunication)
• CRT — Cathode Ray Tube (type of TV)
• JAN — Joint Army-Navy
• DSS — Decision Support System
• SRAM — Static Random Access Memory (ess-ram)
• ARP — Address Resolution Protocol (ATM)
• WE — Western Electric
• FDDI — Fiber Distributed Data Interface
• PUB — Publication (file name extension)
• DBS — Direct Broadcast Satellite
• DOD — United States Department of Defense
• ATN — Aeronautical Telecommunication Network
• URL — Universal Resource Locator
• TCM — Trellis-Coded Modulation
• VT — Virtual Terminal
• DCS — Digital Cross-connect System
• BNSC — British National Space Centre
• CAV — Constant Angular Velocity
• CGSA — Cellular Geographic Service Area
• EM — Electromigration
• DRAM — Dynamic Random Access Memory (dee-ram) (computing)
• SZ — Seizure
• D-NBAP — Dedicated Node B Application Part
• TO — Technical Order
• CSMA — Carrier Sense Multiple Access
• RAM — random-access memory
• DUC — Digital Up-Converter
• BOD — Bandwidth on Demand

• STP — Signal Transfer Point
• PMP — Project Management Professional
• NIC — Network Interface Controller
• ISDN — Integrated Services Digital Network
• WTLS — Wireless Transport Layer Security
• DCS — Digital Cross-Connect
• S/D — Source/Drain
• SOHO — Small Office Home Office
• T-CARRIER — Trunk Carrier
• EMEA — Europe, Middle East and Africa
• AAS — Adaptive Antenna System
• AAF — Advanced Authoring Format
• SRM — Scalable Reliable Multicast
• CDMA — Code Division Multiple Access (voice/data transmission)
• PIN — Personal Identification Number
• DOJ — Department of Justice (US)
• DDL — Digital Data Link
• SLIC — Subscriber Line Interface Circuit
• FRS — Family Radio Service
• SB — Switchboard
• PDC — Personal Digital Cellular
• TAD — Telephone Answering Device
• STI — Speech Transmission Index
• RSRQ — Reference Signal Received Quality
• MAI — Multiple Access Interference
• FXS — Foreign Exchange Subscriber
• CAM — Computer-Aided Mapping
• SL — Single Line
• CCTV — Closed-circuit television
• CTD — Cumulative Trauma Disorder
• TMS — Time Management System
• TLK — Talk
• DL — Data Link
• ASK — amplitude shift keying
• SLP — Service Location Protocol
• CIS — CompuServe Information Service
• SAIC — Science Applications International Corporation
• FAQ — Frequently Asked Questions (sometimes Pronounced Fak)
• O/S — Operating System
• NRC — National Research Council (Canada)
• ITSEC — Information Technology Security Evaluation Criteria
• ATC — Advanced Technology Center
• ITP — Interactive Telecommunications Program
• ECO — Engineering Change Order
• CIR — Committed Information Rate (Frame Relay)
• SLV — Satellite-Launch Vehicle
• SD — Speed Dial
• SPX — Sequenced Packet Exchange
• I.LINK — IEEE 1394, High Performance Serial Bus, implementation
• PC — Peripheral Controller

• ADN — Advanced Digital Network
• DQE — Detective Quantum Efficiency
• SMR — Specialized Mobile Radio
• GB — Gigabyte
• PERT — Program Evaluation and Review Technique
• ASIC — application-specific integration circuit
• OSI — Open Systems Interconnection (iso Standard)
• CB — Citizens' Band
• ETF — Early Termination Fee
• WDN — Wireless Developer Network
• ESTEC — European Space Research and Technology Centre
• PVD — Physical Vapor Deposition
• MV — Motion Vector
• CBWFQ — Class Based Weighted Fair Queueing
• MIS — Management Information System (OSHA)
• ISM — Industrial, Scientific and Medical
• CFA — Carrier Facility Assignment
• TSE — Toronto Stock Exchange
• BRDF — Bidirectional Reflectance Distribution Function
• CS — Central Station
• BR — Branch
• SPM — Scanning Probe Microscope
• YL — Young Lady
• COM — Comedy Central
• CLNP — ConnectionLess-mode Network Protocol
• AP — Action Point
• SQ — Service Quality
• STD — Subscriber Trunk Dialing
• SNMP — Simple Network Management Protocol (ATM)
• CAP — Capability
• AC — Area Code
• SN — Service Number
• IRS — U.S. Internal Revenue Service
• C — Collector
• ELF — Extremely Low Frequency
• CI — Common Interface
• OLAP — Online Analytical Processing
• OS — Operating System
• PDT — Portable Data Terminal
• BPR — Business Process Re-engineering
• AMLCD — Active Matrix Liquid Crystal Display
• CSMA/CD — Carrier sense multiple access / collision detection
• CBP — Coded Block Pattern
• VAZO — Violating All-Zero Octet
• SG — Signaling Gateway (IETF)
• DC — Device Control
• LLU — Local Loop Unbundling
• FCA — Free Carrier Absorption
• CP — Call Processing
• EMR — Electromagnetic Radiation

• SATAN — Security Administrator Tool for Analyzing Networks
• MTTR — Mean Time To Repair
• VPN — Virtual Private Network (ATM)
• P — Priority
• TAM — Telephone Answering Machine
• OSCAR — Orbiting Satellite Carrying Amateur Radio
• MX — Mixer
• CT — Computer Terminal
• LD — Laser Diode
• NPA — Numbering Plan Area
• BPS — bits per second
• CTU — Central Terminal Unit
• EDVAC — Electronic Discrete Variable Automatic Computer
• VG — Voice Grade
• GMRS — General Mobile Radio Service
• DPL — Digital Power Line
• MDM — Mobile Device Management
• PSTN — Public Switched Telephone Network
• SM — Service Module
• FRS — Frame Relay Service
• MH — Message Handler
• E — Electra
• RDS — Rate Determining Step
• GSA — U.S. General Services Administration
• BTC — Botswana Telecommunications Corporation
• CMT — Cadmium Mercury Telluride
• DM — Domain Model
• SN — Stock Number
• SIA — Securities Industry Association
• T-IC — T-interConnect
• RAEX — Roaming Agreement EXchange
• VLF — Very Low Frequency
• CIS — Computer and Information Science
• BSS — Base Station Subsystem
• MIDP — Mobile Information Device Profile
• ER — Extended Range
• SOGA — Share of Gross Adds
• RTC — Real-Time Control
• SDU — Signal Distribution Unit
• MTSO — Mobile Telephone Switching Office
• V — Variable
• 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.
• OSP — Outside Plant
• SPIN — Service Provider Identification Number
• RFI — Request For Information. Sales department shorthand. Special priority when use in conjunction with RFN (see below).
• CDA — Command and Data Acquisition
• AADC — Automated Area Distribution Center
• COPS — Common Open Policy Service
• COO — Chief Operation Officer
• SCU — System Control Unit

• DARPA — Defense Advanced Research Projects Agency (US)
• IRC — International Record Carrier
• WAYP — White and Yellow Pages
• M-CSI — Mobility management CAMEL (Customized Applications for Mobile network Enhanced Logic) Subscription Information
• RSVD — Reserved
• REPT — Report
• MHS — Message Handling System (electronic)
• ITU — International Telecommunication Union
• BSS — Base Station System
• KISS — Keep It Simple Stupid
• XPS — X-Ray Photoelectron Spectroscopy
• EU — End User
• DID — direct inward dial
• SSL — Secure Socket Layer
• DCOM — Distributed Component Object Model
• OSTP — Office of Science and Technology Policy
• FIFO — First In, First Out
• WYSIWYG — What You See Is What You Get (pronounced Wizzy-wig. See Entry For Derived Acronyms)
• ES — Emergency Service
• CSC — Common Signaling Channel
• NOAA — National Oceanic and Atmospheric Administration (US)
• ST — Such That
• NLMS — Normalized Least Mean Square
• KBYTE — Kilobyte (103)
• DII — Dynamic Invocation Interface
• AAAS — American Association for the Advancement of Science
• CBDS — Connectionless Broadband Data Service
• SSRC — Synchronization Source
• CGA — Color Graphics Adapter
• DL — Definition List
• CAA — Civil Aviation Authority
• GOS — Grade Of Service
• ACF — Access Control Field
• MTS — Message Transfer System
• DSN — Deep Space Network - network of large antennas and communication facilities.
• PSS — Performance Support System
• FAS — Frame Alignment Signal
• PC — Personal computer (host)
• RP — Reference Point
• SQL — Structured Query Language
• DSL — Digital Subscriber Line
• ROI — Return on Investment
• ACP — Access Control Point
• CGA — Carrier Group Alarm
• SOW — Statement Of Work
• ET — Electronic Transmission
• HZ — cycles per second (hertz)
• TAX — Trunk Automatic Exchange
• T — Temperature
• DTN — Data Transfer Network

• SSM — Spread Spectrum Modulation
• BSOD — Blue Screen Of Death
• RJ-25 — Registered Jack type 25 (6-wire connector)
• AWT — Agence Wallonne des Télécommunications
• CAD — Computer Aided Designer
• CAPS — Call Attempts Per Second
• AIF — Audio Interchange Format
• MA — Maintenance Action
• CPN — Cisco Powered Network
• NNTP — Network News Transfer Protocol
• ISAS — Institute of Space and Astronautical Sciences (Japan)
• MLP — Mobile Location Protocol
• BMS — Business Management System
• GI — Graded-Index
• EPABX — Electronic Private Automatic Branch Exchange
• ARA — Apple Remote Access
• CRM — Customer Relationship Management
• PPP — Point-to-Point Protocol
• DTMF — Dual-Tone MultiFrequency
• CCTA — Central Computer and Telecommunications Agency
• PSD — Phase-Sensitive Detector
• ADCCP — Advanced Data Communications Control Procedures
• DMTS — Distinguished Member Of Technical Staff
• CE — Channel Element
• AMHS — Automated Message Handling System
• DOS — Disk Operating System
• CRC — Contrôle de Redondance Cyclique (French: Cyclic Redundancy Check)
• CQA — Certified Quality Auditor
• DAP — Distributed Array Processor
• AXE 10 — Series of electronic telephone exchanges from L.M. Ericsson
• CMP — Connection Management Protocol
• AIT — Automatic Identification Technology
• CAM — computer aided manufacturing
• TOVS — TIROS Operational Vertical Sounder
• BIU — Bus Interface Unit
• DDU — Disk Drive Unit
• BGP — Border Gateway Protocol (routing protocol)
• WAR — Weekly Activity Report
• BOSS — Binary Object Storage System
• PRI — Primary Rate Interface (ISDN)
• SABGW — System Architecture Evolution Gateway
• TUR — Trunk Utilization Report
• CHAP — Challenge Handshake Authentication Protocol (ATM)
• SRS — Software Requirements Specifications
• TRS — Telecommunications Relay Service
• EDD — Envelope Delay Distortion
• AQL — Acceptable Quality Level
• RDF — Radio Direction Finder
• NCSC — National Computer Security Center (NSA)
• PU — Physical Unit (IBM)

• LS — Loop Start
• MA — Message Analysis
• PDU — Protocol data unit (such as segment, packet, frame, etc.)
• JIT — Just in time
• SCADA — Supervisory Control And Data Aquisition
• CIP — Carrier Identification Parameter
• ASD — Alternative Service Delivery
• OAM&P — Operations, Administration, Maintenance & Provisioning
• ADC — Administration Center
• LED — law enforcement desk; light emitting diode
• DMI — Distributed Management Interface
• FCS — Frame check sequence (Ethernet)
• ASARS — Advanced Synthetic Aperture Radar System
• BBU — Baseband Unit
• SDLC — Synchronous Data Link Control
• IMP — Interface Message Processor
• ILD — International Long Distance
• SAF — System Access Fee
• PVC — Permanent Virtual Connection
• MME — Mobility Management Entity
• TELECOMMUTE — Telecommuting
• AMD — Advanced Micro Devices, Inc. (producer of computer chips)
• SPA — Software Publishers Association
• IEC — International Electrotechnical Commission
• TDM — Time Division Multiplexer
• XML — Extensible Markup Language
• OML — Object Model Library
• IRS — Inertial Reference System
• TOA — Time Of Arrival
• FTTH — Fiber To The Home
• AN — Access Node
• IPM — Inches Per Minute
• MAC — Media Access Control
• PCI — Personal Computer Interface
• ARINC — Aeronautical Radio Incorporated
• LNP — Local Number Portability
• AP — access point
• JVM — Java Virtual Machine
• NF — Noise Factor
• DMA — direct memory access (computer term)
• CMRS — Commercial Mobile Radio Service
• CONUS — Contiguous United States
• PKI — Public Key Infrastructure (cryptography)
• CRO — Central Records Office
• FOD — Fax on Demand
• NTP — Network Time Protocol
• TNX — Thanks
• ECMA — European Computer Manufacturer's Association
• DM — Differential Mode
• DSSS — Direct Sequence Spread Spectrum

• DPL — Digital Private-Line
• PMT — Program Management Team
• IOC — Inter-Office Channel
• CRTS — Cellular Radio Telecommunications Service
• ACO — Additional Call Offering
• ROFL — Rolling on the floor laughing
• MPI — Minimum Picture Interval
• BCH — Binary Coded Hexadecimal
• DASD — Direct Access Storage Device
• COT — Central Office Terminal
• PM — post meridian
• CIC — Carrier Identification Code
• EEA — European Economic Area
• IEC — Interexchange Carrier
• CDT — Central Daylight Time
• BIP — Bit-Interleaved Parity
• DSP — Digital Signal Processor
• MP — Modulation Parameter
• SIM — Subscriber Identification Module
• SN — Switching Network
• SMS — Service Management System
• HTTPS — HyperText Transfer Protocol Secure
• DGPT — Directorate General of Posts and Telecommunications
• CND — Calling Number Display
• SOAP — Simple Object Access Protocol
• NES — Network Encryption System
• MTU — Maximum Transmission Unit
• CP — Change Proposal
• LDAP — Lightweight Directory Access Protocol (pronounced Ell-dap)
• MSW — Most Significant Word
• AVR — Automated Voice Response
• FI — Format Identifier
• COO — Cell of Origin
• PPARC — Particle Physics and Astronomy Research Council
• MC — Maintenance Control
• CLI — Command line Interface (Cabletron)
• CIP — Channel Interface Processor
• INSAT — Indian National Satellite
• FCC — Federal Communications Commission (US)
• SSM — Synchronization Status Message
• DLL — Dynamic Link Library (computer file)
• DDE — Dynamic Data Exchange (in software parlance)
• NIST — National Institute of Standards and Technology
• RPM — Revolutions Per Minute, (Rotations Per Minute)
• POP — Point Of Presence (Internet)
• PCM — Pulse-Code Modulation
• ASP — Application Service Provider
• NMR — Nuclear Magnetic Resonance
• CMA — Communications Management Association
• ILEC — Incumbent Local Exchange Carrier

• RACF — Resource Access Control Facility
• SDM — Service Delivery Management
• SPADATS — Space Detection And Tracking System
• FGA — Feature Group A
• EHF — Extremely High Frequency
• VN — Virtual Network
• USA — Underground Service Alert
• EEG — Electro-EncephaloGram
• NC — Network Channel
• DID — data item description
• ALOC — Average Length Of Call
• DTI — Department of Trade and Industry (UK)
• LOO — Likelihood of Occurrence
• CRV — Call Reference Value
• TT — Text-Telephone
• MR — Mobile Router
• EMR — Electromechanical Relay
• SAE — Society of Automotive Engineers
• ASA — Acoustical Society of America
• PBX — Private Branch eXchange (company phone system)
• PM — Project Manager
• PACS — Personal Access Communications System
• VTC — Video Teleconference
• SWAP — Shared Wireless Access Protocol
• TSO — Telecommunications Service Order
• WHT — Walsh-Hadamard Transform
• IR — International Roaming
• FC — Frame Control
• SNR — Signal-to-Noise Ratio
• CVR — Crystal Video Receiver
• NEMA — National Electric Manufacturer's Association
• VC-ATOD — Virtual Clearinghouse on Alcohol, Tobacco and Other Drugs
• ARIN — American Registry for Internet Numbers
• AWG — American Wire Gauge
• IRS — Interface Requirements Specification
• CCD — Charge Coupled Device - a device for the movement of electrical charge.
• CSR — Customer Service Report
• CMS — Content Management System
• CMM — Capability Maturity Model
• EDC — Electronic Dispersion Compensator
• MIPS — Millions of Instructions Per Second
• ADM — Administration Building
• CAM — Common Access Method
• DCN — Design Change Notification
• ADT — American District Telegraph Company
• NBS — National Bureau of Standards (US)
• DRM — Digital Rights Management
• ADC — Access Deficit Charge
• BA — Behaviour Aggregate
• RFD — Request For Discussion

• TU — Transmission Unit
• OTDOA — Observed Time Difference of Arrival
• LANE — Local Area Network Emulation
• OT — Office of Telecommunications
• DCA — Dynamic Channel Assignment
• POTS — Plain Old Telephone Service (FCW)
• VOIP — Voice Over IP (Internet Protocol)
• RARP — Reverse Address Resolution Protocol
• TCIC — Trunk Circuit Identification Code
• BSC — Bi-Synchronous Communications
• TD — Transmit Data
• AT&T — American Telephone and Telegraph (U.S. company, also known as "Ma Bell")
• BT — Burst Tolerance
• LPE — Liquid Phase Epitaxy
• GAN — Global Area Network
• OC-9 — Optical Carrier Signal, Level 9
• CG — Center of Gravity (DXS)
• RAU — Remote Access Unit
• ODBC — Open Database Connectivity
• CDM — Conceptual Data Model
• WLAN — Wireless Local Area Network
• FGD — Feature Group D
• DTI — Digital Trunk Interface
• CST — Central Standard Time (UTC-6 Hours)
• QPSK — aeronautical quadrature phase shift keying
• BPDU — Bridge Protocol Data Unit
• EAI — Enterprise Application Integration
• IAT — Integrated Access Terminal
• LASA — Large Aperture Seismic Array
• MIB — Management Information Base (ATM)
• LIF — Logical Interchange Format
• ACA — Adaptive Channel Allocation
• DAHDI — Digium/Asterisk Hardware Device Interface
• WTS — Wireless Telecommunications Symposium
• TC — Transmission Convergence (ATM)
• FIPS — Federal Information Processing Standard
• RP — Radio Port
• MIT — Massachusetts Institute of Technology (U.S.)
• DSI — Digital Speech Interpolation
• RTU — Remote Terminal Unit
• AOS — Alternate Operator Service
• 3G — Third Generation mobile phone network
• CCCH — Common Control Channel
• UN — United Narions
• SSN — Switched Service Network
• MLM — Multi-Longitudinal Mode
• OMF — Object Management Framework
• HVAC — Heating, Ventilation, and Air Conditioning
• CFO — Communication Filing Officer
• OC-18 — Optical Carrier Signal, Level 18

• SAR — synthetic aperture radar (satellite)
• ADT — Atlantic Daylight Time (UTC-3 Hours)
• BRI — Basic Rate Interface
• RSL — Restricted Service License
• RXQUAL — Received Signal Quality
• T&C — Terms & Conditions
• CRS — Cell Relay Service
• ICL — Inserted Connection Loss
• KHZ — kilohertz (1000 cycles per second)
• IMC — Intermediate Metal Conduit
• RNX — Restricted Numeric eXchange
• DSTE — Digital Subscriber Terminal Equipment
• RCU — Radio Control Unit
• ISG — Information Systems Group
• ESCON — Enterprise System Connection
• DVMRP — Distance Vector Multicast Routing Protocol
• TCB — Telecommunication Certification Body
• ACAP — Application Configuration Access Protocol
• SCPC — single channel per carrier
• SSP — Security Service Provider
• BAN — Building Area Network
• FSK — Frequency-Shift Keying
• ARM — Asynchronous Response Mode
• RAN — Radio Access Network
• MPEG — Motion Picture Experts Group
• INTELSAT — International Telecommunications Satellite
• TCA — Threshold Crossing Alert
• FAX — Facsimile
• CPC — Calling Party Control
• DQPSK — Differential Quadrature Phase-Shift Keying
• FAC — Forced Authorization Code
• VSAT — Very Small-Aperture Terminal
• SCM — Supply Chain Management
• WDA — Wireless Digital Assistant
• WFA — Wait for Answer
• EGP — Exterior Gateway Protocol
• B2C — Business-to-Consumer
• ISBN — International Standard Book Number (ISO 2108)
• ANC — Access Network Controller
• EC — European Community
• NIST — National Institute of Standards & Technology (US)
• SIC — Standard Industrial Classification (Code)
• PVC — Permanent Virtual Circuit (ATM)
• DPA — Distributed-Power Architecture
• OLE — Object Linking and Embedding (Microsoft communication protocol)
• ALB — Analog Loopback
• GS — Ground Start
• CV — Coding Violation
• ATS — Abstract Test Suite
• BIOS — Basic Input Output System

• PD — Pulse Duration
• EMC — Electromagnetic Compatibility
• BIS — Business Information System
• CHF — Swiss Franc
• COAX — Coaxial
• PP — Polypropylene
• ULL — Unbundled Local Loop
• RSS — Really Simple Syndication
• CFD — computational fluid dynamics
• BAN — Base Area Network
• RMI — Remote Method Invocation
• ALT — Accelerated Life Test
• FDI — Feeder Distribution Interface
• TTY — Teletype Telex Machine
• RTN — Regional Telecommunication Network
• PIM — Personal Information Manager
• SIL — Solid Immersion Lens
• LISP — List Processing Language
• ISAKMP — Internet Security Association and Key Management Protocol
• TP — Telephone Pole
• AYT — Are You There
• EIGRP — Enhanced Interior Gateway Routing Protocol
• COC — Central Office Connection
• CFD — Call For Discussion
• RCC — Radio Common Carrier
• TOS — Temporarily Out of Service
• EPR — Ethylene-Propylene Rubber
• VPA — Valid Peripheral Address
• ABN — Abnormal
• 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
• BMEWS — Ballistic Missile Early Warning System (bee-mews)
• ERP — Enterprise Resource Planning
• DMS — Data Management System
• LIDB — Line Information DataBase
• IG — Interface Group
• 100BASE-T4 — 100 Megabits per Second, Baseband, Four-pair Category 3 UTP cables
• TP — Transition Point
• ASDE — Airport Surface Detection Equipment
• NTIS — National Technical Information Service Technology Administration
• ROTFL — Roll On The Floor Laughing
• CIFS — Common Internet File System
• LDN — Local Directory Number
• CACH — Call Appearance Call Handling
• B2B — Business to Businesse
• DE — Discard Eligibility (ATM)
• RDT — Recall Dial Tone
• ACTV — Active
• CLK — Clock
• SCR — System Change Request
• RFR — Radio Frequency Radiation

• IANA — Internet Assigned Numbers Authority
• DNIC — Data Network Identification Code
• CID — Craft Interface Device
• VTS — Vessel Traffic Service
• BOFH — Bastard Operator From Hell
• UCF — Unregistration Confirm
• SML/SMS — Service Management Layer/Service Management Service
• LCF — Location Confirm
• TAG — Technical Advisory Group for Biological Control Agents of Weeds
• FLM — First Line Maintenance
• EDP — Electronic Data Processing Plc (London Stock Exchange [LSE])
• RTC — Right to Carry
• TSC — Test System Controller
• ENIAC — Electronic Numerical Integrator And Computer
• SRR — Search and Rescue Region
• OC-256 — Optical Carrier Signal, Level 256
• TCSEC — Trusted Computer System Evaluation Criteria
• FR — Functional Requirement
• BCH — Bose-Chaudhuri-Hocquenghem Coding
• INE — Intelligent Network Element
• SCM — Single-Carrier Modulation
• PABX — private automatic branch exchange (telephone)
• CIS — Center for Integrated Systems
• CAD — Computer-Aided Design
• MFC — Multi-Frequency Code
• UTC — Coordinated Universal Time
• LI — Length Indicator
• DSCP — Differentiated Services Code Point
• PCCA — Portable Computer Communications Association
• DPT — Dynamic Packet Transport
• IPS — InPlane Switching
• EOT — End Of Transmission
• LMS — Learning management system
• RCP — Right-Hand Circular Polarization
• QS — Quasi-Synchronous
• CTO — Commonwealth Telecommunications Organisation
• BJT — Bipolar Junction Transistor
• PDL — Positioning Data Link
• RAD — Recorded Announcement Device
• LH — Link Handler
• SAT — Satellite
• PDN — Packet Data Network
• VNS — Virtual Network System
• LATA — Local Access and Transport Area
• VMS — Virtual Memory System
• SVP — Senior Vice President
• MF — Multiple Frequency
• EIA — Extended Interaction Amplifier
• 1000BASE-T — 1000 Megabits per Second, Baseband, Twisted Pair
• UPS — Uninterruptible Power Supply

• NTIA — National Telecommunications and Information Administration
• CFV — Call For Vote(s)
• WARC — World Administrative Radio Conference
• RAID — Redundant Array of Inexpensive Disks
• APDU — Application Protocol Data Units
• WAE — Wireless Application Environment
• MMM — Mobile Media Mode
• BP — Block Parity
• AFM — Atomic Force Microscopy
• FCA — Fixed Channel Allocation
• TP — Termination Point
• ECPA — Electronic Communications Privacy Act 1986
• WIN — Wireless Intelligent Network
• FMS — Fixed Mobile Substitution
• KAK — Key-Auto-Key
• VR — Virtual Router
• GLT — Great Lakes Telecom
• QDR — Quad Data Rate
• EMCON — Electromagnetic Emission Control
• TED — Triteal Enterprise Desktop
• LB — Local Battery
• DLP — Data Link Processor
• DN — Distinguished Name
• ORB — Object Request Broker
• DIL — Direct Inward Line
• AWACS — Airborne Warning And Control System
• ISOC — Internet Society
• BIS — Brought Into Service
• CORBA — Common Object Request Broker Architecture
• AVL — Available
• COMDEX — Computer Dealers Exposition
• MDF — Main Distribution Frame
• CDE — Common Desktop Environment
• CT — Cordless Telecommunications
• UMTS — Universal Mobile Telecommunications Service
• ARQ — Automatic Repeat-reQuest
• NCF — Network Control Facility
• TCC — Transmission Control Code
• IPS — Instructions Per Second
• ECS — Encryption Control Signal
• PJC — Pointer Justification Count
• SPID — Service Profile Identifier
• DSLAM — Digital Subscriber Line Access Multiplexer (Module)
• ET — Exchange Terminal
• SHA — Secure Hash Algorithm
• SCC — Specialized Common Carrier
• YA — Yet Another
• ISSN — International Standard Serial Number (ISO 3297)
• DAT — Digital Audio Tape
• JPEG — Joint Photographic Experts Group (24-bit image storage format)

• CLD — Cross-Layer Design
• ADB — Apple Desktop Bus
• SW — South West
• TDMA — Time Division Multiple Access
• SCE — Service Creation Environment
• DOD — Dial on Demand
• EMS — Express Mail Service
• DTD — Document Type Definition (XML)
• ELINT — Electronic Intelligence Satellite
• C³CM — Command, Control and Communications Countermeasures
• SCR — Sustainable Cell Rate
• 100BASE-T — 100 Megabits per second, Baseband, Twisted pair
• VF — Voice Frequency
• 3GPP — Third Generation Partnership Project
• JRE — Java Runtime Environment
• WWAN — Wireless Wide Area Network
• APPL — Application
• CPG — Converged Packet Gateway
• L2TPV3 — Layer 2 Tunneling Protocol Version 3
• GHZ — Gigahertz
• CSO — Customer Service Operations
• OWS — Operator Work Station
• ELT — Emergency Locator Transmitter
• 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)
• DA — deca
• EIP — Equipment installation procedure
• 10BASE-T — 10 Megabits per second, Baseband, Twisted pair
• HEHO — Head End Hop Off
• 2W — Two Wire
• CS — Convergence Sublayer (ATM)
• OMP — Open Management Platform
• NDVI — Normalized Difference Vegetation Index
• EVA — Electronic Video Agent
• DIBL — Drain-induced Barrier Lowering
• VCA — Voice Connecting Arrangement
• FEC — Forward Error Correction
• ACC — Area Control Center
• CAPTAIN — Character And Pattern Telephone Access Information Network
• LCP — Local Control Point
• UI — User Interface
• EOB — End Of Business
• EMS — Element Management System (ATM)
• PM — Processable Mode
• PAP — Password Authentication Protocol (ATM)
• MGC — Multimedia Gateway Controller
• BSA — Business Software Alliance
• QAM — quadrature amplitude modulation
• AFSK — Audio Frequency Shift Keying
• BER — Basic Encoding Rules (ASN.1)
• SDK — Software Development Kit (Microsoft)

• VO — Voice Only
• SE — Southeast
• B3G — Beyond Third Generation
• DDN — U.S. Defense Data Network
• SDH — Synchronous Digital Hierarchy (ATM)
• NIU — Network Interface Unit
• BSI — British Standards Institution
• ASI — Asynchronous Serial Interface
• CPS — characters per second
• CFNRY — Call Forwarding on No Reply
• ACPI — Advanced Configuration and Power Interface
• ETN — Electronic Tandem Network
• WAP — Wireless Application Protocol
• P&A — Privacy and Authentication
• TP — Transaction Processor
• MSDP — Multicast Source Discovery Protocol
• RSS — root-sum-square
• GBT — Ground Based Tower
• VGA — Video Graphics Array
• WMO — World Meteorological Organization (ICSU)
• 2G — Second generation cellular
• ISI — Intersymbol Interference
• SIGTRAN — Signaling Transport
• SOS — Save Our Souls (Help!)
• MMU — Memory Management Unit
• ASN.1 — Abstract Syntax Notation One
• CRIS — Carrier Route Information System
• RSVP — Resource Reservation Protocol (Internet)
• UART — Universal Asynchronous Receiver/Transmitter
• EDT — Eastern Daylight Time
• ECM — Electronic Counter Measures
• APS — Automatic Protection Switching (SONET/SDH)
• HLR — Home Location Register
• ASAR — Advanced Synthetic Aperture Radar 
• TNI — Telephone Network Interface
• TCM — Time Compression Multiplexer
• TCO — Total Cost of Ownership
• CMT — Commercial Metering Transponder
• EULA — End User License Agreement (usually in reference to software)
• OFC — Office
• TCS — Telephony Control Specification
• KDC — Kerberos Key Distribution Center
• RDF — Resource Description Framework
• HSS — Home Subscriber Server
• EA — Extended Address Field Bit
• EISA — Extended Industry Standard Architecture
• AFOSR — Air Force Office Of Scientific Research(USA)
• FNN — Full National Number
• CM — Connection Manager
• AT — Attenuation

• RMS — root mean square (preferred over "RMS")
• FMR — Follow Me Roaming
• IAB — Internet Architecture Board
• VLSI — Very Large-Scale Integration
• VPX — Virtual Path Cross-Connect
• SBU — Strategic Business Units
• RBS — Robbed Bit Signaling
• KB — Kilobyte: One thousand and twenty-four bytes kbps kilo bit per second
• CAL — Calorie
• RICK — Repeater Interface Communications Kit
• DXC — Digital Cross Connect
• SIO — Service Information Octet
• ALI — Automatic Location Information
• DDM — Data Distribution Manager
• CES — Consumer Electronics Show
• O&M — Operation and Maintenance
• TDD — Time Division Duplex
• LMS — Location and Monitoring Service
• NII — National Information Infrastructure (USA)
• VSC — Vertical Service Code
• LVM — Line Verification Module
• RISC — Reduced Instruction Set Computing
• FASB — Financial Accounting Standards Board
• USGS — United States Geological Survey (DOI)
• MBPS — Megabits per second
• DNS — Domain Name Service
• LRQ — Location Request
• KM — Knowledge Management
• FPS — Framing Pattern Sequence
• DIV — Divisionsion
• RDT — Remote Digital Terminal
• RADIUS — Remote Authentication Dial-In User Service
• RRN — Routing Recording Number
• FITL — Fiber-In-The-Loop
• EDSX — Electronic Digital Signal Cross-Connect
• PM — Phase Modulation
• VCR — Videocassette Recorder
• EEPROM — Electrically Erasable Programmable Read-Only Memory
• LRC — Learning Resource Center
• TL1 — Transaction Language 1
• OOP — Object-Oriented Programming
• EST — Establish
• TOMS — Total Ozone Mapping Spectrometer (satellite Instrument)
• CLETS — California Law Enforcement Telecommunication System
• CPAP — Customer Premises Access Profile
• CDM — Configuration Data Manager
• EBCDIC — Extended Binary-Coded Decimal Interchange Code
• EMF — Event Management Framework
• SNA — System Network Architecture
• VOC — Volatile Organic Compounds (air pollution)

• PST — Pacific Standard Time (UTC-8 Hours)
• CMD — Command
• DII — Defense Information Infrastructure
• TDOA — Time Difference Of Arrival
• 911 — Emergency Services Phone Number
• NSS — Network Switching Subsystem
• EM — Element Manager
• WTO — World Trade Organisation
• DUA — Directory User Agent
• AWG — arrayed waveguide grating
• CPH — Call Party Handling
• IAD — Integrated Access Device
• FEP — Front-End Processor
• BUS — Business
• LSW — Least Significant Word
• ADM — Add-Drop Multiplexer
• TKIP — Temporal Key Integrity Protocol
• OSS — Operations Support System
• PSDN — Public Switched Digital Network
• WTL — Wireless Transport Layer
• RSN — Real Soon Now [which may be a long time coming]
• VLF — Vertical-Laminar-Flow
• STA — State
• LXT — Local Exchange Terminal
• TEL — Telephone
• PY — person-year
• FTTC — Fiber To The Curb光纤到路边
• CRBT — Caller Ring Back Tone
• DCE — Data Communication Equipment
• CTE — Computer Telephony Engineer
• NRPB — National Radiological Protection Board
• QI — Quality Indicator
• WSFL — Web Services Flow Language
• LLA — Link Level Access
• DPDU — Data Protocol Data Unit
• SSMA — Spread-Spectrum Multiple Access
• DSS — Digital Signature Standard
• TSR — Terabit Switch/Router
• ABBR — Abbreviation
• APN — An Access Point Name
• MGMT — Management
• 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
• AMP — amplifier / amplification
• FEP — Front End Processor
• MAG — Mobile Access Gateway
• SPD — Serial Presence Detect
• ADN — Abbreviated Dialing Number
• IP — Intellectual Property
• RDI — Remote Defect Indicator (UNI Fault Management)
• TACSAT — Tactical Satellite

• HPN — Home Phone Network
• JCL — Job Control Language
• DER — Distinguished Encoding Rules
• SR — Scanning Radiometer
• ASN.1 — Abstract Syntax Notation 1
• DHD — Dial Home Device
• FTTK — Fibre To The Kerb
• BASIZE — Buffer Allocation Size
• PSN — Packet Switched Network
• ACSE — Association Control Service Element
• SMDS — Switched Multimegabit Data Service (ATM)
• SRL — Singing Return Loss
• TRS — Trunked Radio Systems
• LP — Line Pair
• ESF — Edge Spread Function
• PCMCIA — Personal Computer Memory Card International Association
• HEX — Hexadecimal (base 16)
• OD — Outside Diameter
• VPI — Virtual Path Identifier
• WIPO — World Intellectual Property Organization
• CSP — Converged Service Platform
• DCS — Data Collection System (NOAA Polar Orbiting Satellites)
• AAP — Alternate Access Provider
• ISC — International Switching Center
• CGM — Computer Graphics Metafile
• PROM — Programmable Read-Only Memory
• WAR — Wireless Access Revolution
• SDP — Software Development Plan
• ICANN — Internet Corporation for Assigned Names and Numbers
• NAT — Network Address Translation
• VBR — Variable Bit Rate (ATM)
• MCC — Mission Control Center (JSC)
• FDTD — Finite Difference Time Domain
• WSDL — Web Services Description Language
• WVOIP — Wireless Voice over Internet Protocol
• VCC — Virtual Channel Connection (ATM)
• EFT — Electronic Funds Transfer
• DDCMP — Digital Data Communications Message Protocol
• CPT — Cellular Paging Teleservice
• VHSIC — Very High-Speed Integrated Circuit
• WPM — speech--words per minute
• DAF — Directory Access Function
• GTB — Global Telecom Brokers
• ACEK — Authentication Encryption Key
• CLDC — Connected Limited Device Configuration
• FAT — File Allocation Table
• VOB — Versioned Object Base
• VDR — Voice Digitization Rate
• ABM — Asynchronous Balanced Mode
• ECM — Error Correction Model

• ECP — Engineering Change Proposals
• WAIS — Wide Area Information Server
• SMB — Server Message Block
• DQDB — Distributed Queue Dual Bus
• CBR — Constant Bit Rate
• NMS — NetWare Management System
• IMEI — International Mobile Equipment Identity
• UCM — Use Case Map
• ASQ — Alpha System Qualification
• TFTP — Trivial File Transfer Protocol (ATM)
• SISIR — Singapore Institute of Standards and Industrial Research
• ANI — Automatic Number Identification (Caller ID)
• MIME — Multipurpose Internet Mail Extension
• MHO — My Humble Opinion
• CCIR — International Radio Consultative Committee (French Acronym)
• WFA — Work Force Administration
• B-ISDN — Broadband Integrated Services Digital Network
• VBA — Visual BASIC for Applications
• COMINT — Communications Intelligence
• OSD — Onscreen Display
• SPC — Statistical Process Control. Forerunning quality theory from the 1960s to TQC and TQM.
• C4 — Command, Control, Communications, and Computers
• TTYL — Type To You Later
• YAHOO — You Are Hazy Over Oranges
• BLER — Block Error Rate
• YYP — Yahoo Yellow Pages
• CSPRM — Common Signaling Protocols Resource Module
• X — X Window System
• CCSD — command communications service designator; control communications service designator
• CCA — Carrier-Controlled Approach
• POP — Post Office Protocol
• OXCO — Oven-Controlled Crystal Oscillator
• YABA — Yet Another Bloody Acronym
• GDM — GSM (Global System for Mobile communications) Data Module
• LN — Line
• BOM — Bit-Oriented Message
• IRQ — Interrupt Request
• STMR — Sidetone Masking Rating (telecommunications)
• CMIP — Common Management Information Protocol (ATM)
• CQ — Communications Quality
• MAC — Message Authenticity Check
• LBR — Low Bit Rate
• PTP — Point To point Protocol
• CNG — Fax Calling Tone
• TEI — Terminal Endpoint Identifier
• AI — Adapter Interface
• CRB — Cramer-Rao Bound
• BIND — Berkeley Internet Name Domain
• RJE — Remote Job Entry
• WORM — Write-Once, Read-Many

• MMS — Multimedia Message Service
• PSK — phase-shift keying
• OSF — Open Software Foundation
• NRP — Network Resource Planning
• DTU — Data Transfer Unit
• BHCA — Busy Hour Call Attempt
• AAAI — American Association for Artificial Intelligence's
• ITA — Illinois Telecommunications Association
• SQL — Specified Quality Level
• EBIC — Electron Beam Induced Current
• IVP — Integrated Voice Protocol
• NAS — Network-Attached Storage
• ACLR — Adjacent Channel Leakage Ratio
• VSAT — Very Small Aperture Terminal (satellite service)
• SES — Scientific and Engineering Software
• BCDIC — Binary Coded Decimal Interchange Code
• ATB — Above-Ground Telecommunications Backbone
• DPDT — Double-Pole Double-Throw
• ESA — Enhanced Subscriber Authentication
• SMI — Structure of Management Information
• 2W — 2-Wire
• FOSE — Federal Office Systems Exposition
• BAM — Basic Access Module
• UTL — Utility
• JDK — Java Development Kit
• PTT — Push to Talk Technology
• DVB — Digital Video Broadcasting
• VCI — Virtual Channel Identifier
• DSCS — Defense Satellite Communication System
• LMS — Local Measured Service
• STP — standard temperature and pressure (0° and 1 atm)
• EV — electronvolt
• SPA — Special Prorate Agreement
• NFPA — National Fire Protection Association
• ECR — Electronic Cash Register
• DEMUX — Demultiplexer
• RPV — Remotely Piloted Vehicle
• SGS — Software Generation System
• NOC — Network Operations Center
• TSGR — Transport System Generic Requirements
• WINS — Windows Internet Name Service
• RADIUS — Remote Authentication dial In User Service
• UDT — Unreliable Data Transfer
• UMA — Unlicensed Mobile Access
• CBEMA — Computer & Business Equipment Manufacturers Association
• LRC — Longitudinal Redundancy Check
• AAV — Accountholder Authentication Value
• EIR — Equipment Identity Register
• DIS — Draft International Standard
• ECC — Emergency Communications Center

• FEA — Finite Element Analysis
• QOD — Quality of Data
• BPP — Billed Party Preference
• ACF — Advanced Communications Function (IBM)
• VLAN — Virtual Local Area Network
• NOAO — National Optical Astronomy Observatories (Tucson, AZ)
• DTE — Digital Terminal Equipment
• LSAP — Link Service Access Point
• CSP — Continuous Speech Processing
• RRC — Root Raised-Cosine
• CPOP — Circuit Precedence Over Packet data
• OTA — Office of Technology Assessment (U.S.; abolished by Congress, Fall 1995)
• LIS — Lightning Imaging Sensor
• DCO — Dial Central Office
• DRQ — Disengage Request
• CAVE — Cellular Authentication and Voice Encryption Algorithm
• DECCO — DISA Defense Commercial Communications Office
• WPAN — Wireless Personal Area Network
• CMOS — Complementary Metal Oxide Semiconductors
• NFR — Near-Field Recording
• MB — Measured Business
• SRS — Supported Residential Services
• LAG — Link Aggregation Group
• IPCP — Internet Protocol Control Protocol
• TRMM — Tropical Rainfall Measuring Mission (US-Japan)
• BPSK — Binary Phase-shift Keying
• RDMA — Remote Direct Memory Access
• ADF — automatic document feeder
• HSCSWD — High-Speed Circuit-SWitched Data
• BNC — Bayonet Neill-Concelman
• DTR — Down-Time Ratio
• 4G — Fourth Generation Wireless Systems
• APPC — Advanced Program-to Program Communications
• EMI — Electro-Magnetic Interference
• JST — Japan Standard Time
• QEDI — Quod Erat Demonstrandum
• SWBD — Switchboard
• IWF — Interworking Function
• DSCP — Differentiated Services Control Point
• ESCA — photoelectron spectroscopy for chemical analysis
• RX — Receive
• CS — Connection Segment
• ACF — Access Coordination Function
• TOC — Telecommunication Operations Center
• UML — Unified Modeling Language (Object Management Group, OMG)
• AAS — Automatic Announcement Subsystem
• FWA — Fixed Wireless Access
• CES — Circuit Emulation Service
• BSS — Broadband Switching System
• RDBMS — Relational Data Base Management System (Oracle)

• TPF — Transmission Priority Field
• CC — Country Code
• MCR — Minimum Cell Rate (ATM)
• SCH — Synchronization Channel
• BSA — Basic Service Area
• RMON — Remote Monitoring
• C3I — Command, Control, Communications & Intelligence
• SIT — Static Induction Transistor
• RECON — Reconnaissance
• IMAP — Internet Mail Access Protocol
• TBCD — Telephony Binary Coded Decimal
• IR — Information Request
• SVC — Switched Virtual Circuit (ATM)
• EFS — Encrypting File System
• ESP — Essential Service Protection
• TSC — Technical Standards Committee
• ROS — Return on Sales
• POE — power over ethernetinjector
• NCOS — Network Class Of Service
• DCA — Distributed Communications Architecture
• CODEC — Coder/decoder
• VSAM — Virtual Storage Access Method
• COP — Character Oriented Protocol
• M/W — MicroWave
• AOL — America on line
• HTML — Hyper Text Markup Language
• CCC — CDMA Cluster Controller
• LQR — Linear Quadratic Regulator
• OSHA — Occupational Safety and Health Act (1970)
• FOIP — Fax Over Internet Protocol
• SONET — Synchronous Optical Network
• ACT — ACTIVITY, ACTIVITIES
• GDK — GIMP (GNU Image Manipulation Program) Drawing Kit
• DDU — Digital Data Unit
• SIP — Session Initiation Protocol
• NCAR — National Center for Atmospheric Research (US)
• DOCSIS — Data over Cable Service Interface Specification
• LT — Line Termination
• ESP — Encapsulating Security Payload
• TLT — Test Loop Translator
• CSPDN — Circuit Switched Public Data Network
• NLM — National Library of Medicine (National Institutes of Health)
• AF — Assured Forwarding
• BDE — Borland Database Engine
• BY — Busy
• EFCI — Explicit Forward Congestion Indication (ATM)
• PLE — Path Length Efficiency
• TACS — Total Access Cellular System
• RFI — Remote File Inquiry
• EBS — Electron Bombarded Silicon

• SCC — Signal Conversion Circuit
• CCNA — Cisco Certified Network Administrator
• TRIG — Trigger
• RGN — Region
• SAM — Service Access Multiplexer
• IPLC — International Private Leased Circuit
• TSD — Type Specific Driver
• CALEA — Communications Assistance for Law Enforcement Act
• EVC — Electronic Voucher Charging
• CAM — Content Addressable Memory
• NSAI — National Standards Authority of Ireland
• DACS — Digital Access and Cross-Connect System
• CCITT — Comit? Consultatif International T?l?graphique et T?l?phonique
• CGI — Cell Global Identity
• DLL — Digital Local Line
• AFRINIC — African Network Information Centre
• UPT — Universal Personal Telecommunications
• LCR — Least Cost Routing
• NT — New Technology, also Windows NT
• STU — Secure Telephone Unit
• NE — Network Element
• CAUCE — Coalition Against Unsolicited Commercial Email
• DDSN — Digital Derived Services Network
• CIRC — Cross-Interleaved Reed-Solomon Code
• CAMA — Centralized Automatic Message Accounting
• CIP — Continuous Improvement Program
• AMPS — Advanced Mobile Phone Service (cellular phone standard)
• NMC — Network Management Center
• CCITT — Comite Consultatif International Telegraphique et Telephonique (now ITU-T)
• CBQ — Class-Based Queuing
• RLU — Remote Line Unit
• SMPTE — Society of Motion Picture and Television Engineers, Inc.
• D-RAM — Dynamic Random Access Memory
• BDFB — Battery Distribution Feeder Bay
• MTS — Message Transmission Subsystem
• ISP — International Signaling Point
• TDD — Telecommunications Device for the Deaf
• TBPS — Terabits Per Second
• ECE — Economische Commissie voor Europa (United Nations) (Dutch: Economic Commission for Europe)
• HDML — Handheld Device Markup Language
• SMU — Service Management Unit
• AMPS — Advanced Mobile Phone System
• LEC — Local Exchange Carrier
• L2TP — Layer 2 Tunneling Protocol
• BHP — Burst Header Packet
• IPTD — Internet Protocol Telephony Design
• SMG — Super Master Group
• SRA — Seamless Rate Adaptation
• CVD — Chemical Vapor Deposition
• IOC — Interoffice Channel

• SS7 — Signaling System 7
• NIMBY — Not In My Back Yard
• CDA — Communications Decency Act of 1996
• S/N — Signal-to-Noise ratio
• PSN — Public Switched Network
• NSAP — Network Service Access Point
• MP — Master Processor
• PMT — Photo Multiplier Tube
• RCT — remote Control Terminal
• DCMI — Dublin Core Metadata Initiative (Online Computer Library Center)
• VRML — Virtual Reality Modeling Language
• VFL — Visual Fault Locator
• FDD — Frequency Division Duplex
• BTO — Betts Telecom Oklahoma
• GMSS — Global Mobile Satellite System
• STN — Station
• OLS — Optical Line System
• TRX — Tandem Repeater eXchange
• IDLC — Integrated Digital Loop Carrier
• TM — Thematic Mapper (Landsat)
• RYP — Russian Yellow Pages
• NW — North West
• MAP — Mobile Application Part
• BLOS — Beyond Line-Of-Sight
• VADB — Virtual Auto Dial Backup
• FH — Frequency Hopping
• DFG — difference-frequency generation
• * — Star, special function key
• B-ISDN — Broadband ISDN
• MED — Manipulative Electronic Deception
• DXF — Data Exchange Format
• SHR — Self-Healing Ring
• SVC — Single Voice Coil
• DLT — Delete
• SPT — System Page Table
• PIC — Programmable Interrupt Controller
• CTI — Computer Telephony Integration
• DARTS — Design Approach for Real-Time Systems
• PUK — PIN (Personal Identification Number) Unlocking Key
• COFA — Change Of Frame Alignment
• IRDA — Infrared Data Association
• RMS — Resource Management System
• ATS — Automatic Transfer Switch
• OCC — Occupancy
• CEPT — Conférence Européenne des Administrations des Postes et des Télécommunications
• AMTFT — Active Matrix Thin Film Transistor
• NREN — National Research and Education Network
• DL — Downlink Message
• BTAM — Basic Telecommunications Access Method
• ARAI — Adjunct Route Application Interface

• IPVX — Internet Protocol version X
• DMARC — Demarcation point
• CBMS — Computer-Based Message System
• 1FB — Single line, Flat Business rate;
• IOS — Internet Over Satellite
• AIFF — Audio Interchange File Format
• DNIS — Dialed Number Identification Service
• DS0 — Digital Signal Zero
• CCNA — Cisco Certified Network Associated
• VLSI — Very-Large-Scale Integration
• IRTF — Internet Research Task Force
• IMSI — International Mobile Subscriber Identity
• NCSA — National Center for Supercomputing Applications
• SAR — Segmentation and Reassembly (ATM)
• CPN — Customer Premise Network
• RCR — Research and Development Center for Radio Systems
• LMDS — Local Multipoint Distribution Service
• MGCP — Multimedia Gateway Control Protocol
• F — Frequency
• AL — Alignment
• RACH — Random Access Channel
• FD — Full Duplex
• DS-0 — Digital Signal, Level 0
• EA — expedited acknowledgement
• PTT — Push to Talk Testing
• CRLF — Carriage-Return Line-Feed
• DCC — Digital Control Channel
• TIFF — Tag Image File Format
• MLA — Modern Language Association
• WCDMA — Wideband Code Division Multiple Access
• RS-422 — Recommended Standard 422 (ANSI/EIA standard for transmitting serial data)
• SMSC — Short Message Service Center
• AMSS — Automatic Message Switching System
• PARC — Palo Alto Research Center
• BELLCORE — Bell Communications Research, Inc.
• ATIS — Automatic Transmitter Identification System
• DLCI — data link connection identifier
• DPCM — differential pulse code modulation
• C² — Command and Control
• CMC — Career Management Center
• FECN — Forward Explicit Congestion Notification (ATM)
• BHCC — Busy Hour Call Completions
• CSCW — Computer-Supported Cooperative Work
• STM — Synchronous Transfer Mode
• CSU — Channel Service Unit
• FMC — Fixed Mobile Convergence "Mobile UC or Unified Communications over Wireless"
• SSAP — Source Service Access Point
• SDSL — Symmetric Digital Subscriber Line
• LOP-P — Loss Of Pointer - Path
• CLCC — Ceramic Leaded Chip Carrier

• AS — Active Service
• ATL — Atlanta
• MOD — Modulo
• APS — American Protective Services
• FEXT — Far-End Cross Talk
• TDWR — Terminal Doppler Weather Radar
• MTI — Moving Target Indicator
• DPNSS — Digital Private Network Signaling System
• WAW — Wide Area Wireless
• APS — Advanced Power System
• SXS — Step-By-Step
• FCA — Free Carrier Alongside
• CU — Cooling Unit
• ALT — Automatic Link Transfer
• MOS — Metal Oxide Semiconductor (FET Devices)
• NCP — Network Control Protocol
• AAS — advanced automation system (FAA)
• ESN — Electronic Serial Number
• MBWA — Mobile Broadband Wireless Access
• STA — Science and Technology Agency (Japan)
• PRM — Performance Report Message
• ASE — Application Service Element
• LSC — Link State Control
• CAR — committed access rate
• MOC — Maintenance and Operations Console
• UMTS — Universal Mobile Telecommunications Standard
• ACM — Address Complete Message
• CONS — Connection-oriented Network Services
• MOA — Managed Object Agent
• FTTB — Fiber To The Building
• NTDS — Naval Tactical Data System
• CSIRO — Commonwealth Scientific and Industrial Research Organization
• E&M — ear and mouth (special signaling leads)
• BRAN — Broadband Radio Access Network
• PNP — Plug-and-Play
• SMS — System Management Server
• SDCCH — Standalone Dedicated Control Channel
• SINAD — SIgnal-to-(Noise And Distortion) ratio
• MILNET — Military Network
• P2P — Person-to-Person
• VPWS — Virtual Private Wire Service
• TSI — time-slot interchange
• CR — Connection Request
• DIAG — Diagnostics
• IPRC — Intellectual Property Rights Committee
• VOB — Voice Over Broadband
• TDRSS — Tracking and Data Relay Satellite System
• LDP — Label Distribution Protocol
• MAJ — Major
• CCR — Customer Controlled Reconfiguration (Sprint)

• ADPC — Automatic Data Processing Center
• IEEE — Institute of Electrical and Electronics Engineers
• DCAS — Downloadable Conditional Access System
• PLL — Phase Locked Loop
• BC — Basic Call
• AB — Answer Back
• ASEAN — Association of South East Asian Nations
• IDF — Independent Distribution Frame
• NWK — Network
• SEM — Scanning Electron Microscopes
• MEH — Mobile-Executed Handoff
• DW — Deep Water
• DNA — Do Not Answer
• LORAN — Long Range Aid to Navigation System
• ARSR — Air Route Surveillance Radar
• NAK — Negative Acknowledge
• RIPE NCC — Reseaux IP Europeens Network Coordination Centre
• CCLC — Carrier Common Line Charge
• PEM — Privacy-Enhanced Mail
• NE — North-East
• DDD — Direct Distance Dial
• DTAP — Direct Transfer Application Process
• SVI — Service Interception
• DPSK — Differential Phase Shift Keying
• URN — Uniform Resource Namespace
• OIM — Operations Interface Module
• RSS — Radio Service Software (Motorola)
• 4 GIG — 4 Giga Intellectual Gadget
• GBPS — Gigabits per second
• PBT — Polybutylene Terephthalate
• PIM — Protocol Independent Multicast
• DSN — Defense Switched Network
• ATR — Advanced Telecommunications Research Institute
• CSR — Customer Service Request
• WSA — Wireless Security Auditor
• 4W — Four-Wire
• CNG — comfort noise generation
• CAMEL — Customized Applications for Mobile-network Enhanced Logic
• SDP — Session Description Protocol
• IDCP — Internet Device Control Protocol
• EMV — EuroPay, MasterCard, Visa
• RQMT — Requirement
• RCS — Radar Cross Section
• RAI — remote alarm indication
• B2B — Business-to-Business
• 2G — Second Generation Wireless Systems
• NCC — Network Control Center (GSFC)
• IBSS — Independent Basic Service Set
• AIS-L — Alarm Indication Signal - Line
• ASYNC — Asynchronous

• DISA — U.S. Defense Information Systems Agency
• NAFTA — North American Free Trade Agreement
• DMS — Defense Messaging System
• USF — Universal Service Fund
• SPE — Synchronous Payload Envelope
• TPS — Telephone Preference Service
• VTAM — Virtual Telecommunication Access Method
• BT — Bluetooth Tablet
• CAC — Connection Admission Control (Asynchronous Transfer Mode)
• BTL — Bell Telephone Laboratories, Inc.
• PSLV — Polar Satellite Launch Vehicle (Indian Space Research Organization; India)
• DDLD — Direct Dial Long Distance
• GFC — Generic Flow Control (ATM)
• Z — Zulu Time
• VISSR — visible and infrared spin scan radiometer (GOES)
• WNAP — Wireless Network Access Point
• OOK — On/Off Keying
• MTD — Moving Target Detection
• HSPA — High Speed Packet Access
• DSSSL — Document Style Semantics and Specification Language
• CVT — Circuit Validation Test
• TTC — Telemetry Telecommand and Control
• QOI — Quality of Information
• VTAC — Vermont Telecom Advancement Center
• DAC — Digital-To-Analog Converter
• CTIA — Cellular Telecommunications Industry Association
• CS-PDU — Convergence Sublayer - Protocol Data Unit
• DBN — Dial-Back Number
• LAAS — Local Area Augmentation System
• RAU — Radio Access Unit (Army)
• HSC — High Speed Connect
• ADM — Administration, Office of
• DOT — Department of Telecommunications (India)
• MAPDU — Management Application Protocol Data Unit
• NCP — Network Control Program
• AAV — Alternate Access Vendor
• VESA — Video Electronics Standards Association
• SKU — Stockkeeping Unit
• LPD — Low Probability of Detection
• APR — Alarm Processing Remote
• SITA — Société Internationale de Télécommunications Aéronautiques
• EGSM — Extended Global System for Mobile Communications
• PLCP — Physical Layer Convergence Procedure
• AH — Authentication Header
• MQFP — Metric Quad Flat Pack
• OCI — object code insertion
• CDR — Common Data Rate
• DISN — Defense Information Systems Network
• PAM — Payload Assist Module
• EPP — Enhanced Parallel Port (PC)

• JISC — Japanese Industrial Standards Committee
• ESPN — Entertainment and Sports Programming Network
• SDNS — Secure Data Network System
• MMDS — Multichannel Multipoint Distribution Service
• AUI — Attachment Unit Interface
• TCP/IP — Transmission Control/Internet Protocol
• NAM — Numeric Assignment Module
• REG — range extender with gain
• DAC — Digital to Analog Converter-Audio
• CW — Call Waiting Supplementary Service
• CEPT — Conference of European Posts and Telecommunications
• AMR — Automated meter reading also known as Automatic Meter Reading
• BSVCI — Broadcast Signaling Virtual Channel Identifier
• DECT — Digital Enhanced Cordless Telecommunication
• CPE — Customer Premise Equipment
• OMA — Open Mobile Alliance
• 4WAI — Four-Wire Analog Interface
• AECT — Association for Educational Communications and Technology's
• VAS — Value Added Services
• DORK — Disciples Of The Righteous King
• DTW — Dynamic Time Warping
• AMA — automatic message accounting
• DMI — Desktop Management Interface (computing)
• MPU — Main Processor Unit
• USPI — Universal Serial Phone Interface
• OBC — Onboard Computer
• OSA — Open System Architecture
• LQR — Line Quality Report
• AIS-V — Alarm Indication Signal - Virtual
• IRF — Impulse Response Function
• FR PVC — Frame Relay Permanent Virtual Connection
• CF — Coin First Payphone
• GOMP — Get Off My Phone
• SR — Slow Release
• MCP — Microsoft Certified Professional
• CMOS — Cellular Management Operation System
• LSI — Large Scale Integration -> VLSI
• BCM — Bit Compression Multiplexer
• ASTD — American Society of Training and Development (Alexandria, Virginia)
• # — Number sign, octothorp; special function key
• MIS — Miscellaneous
• ADP — Automatic Data Processor
• WPBX — Wireless Private Branch Exchange
• 4GL — Fourth-Generation Language
• SDN — Software Defined Network
• UASL — Unified Access Service License
• RLC — Radio Link Control
• ATS — Air Traffic Services
• LIM — Line Isolation Monitor
• WK — Week

• PTM — Point-To-Multipoint
• DM — Design Manager
• PHY — Physical Layer
• WDMW — Web Directory for Mobile and Wireless
• LMT — Lightwave Microcell Transceiver
• AFPS — Automatic Facility Protection Switching
• FTTP — Fiber To The Premises
• SPGA — Staggered Pin Grid Array
• AGCH — Access Grant Channel
• PN — Public Network
• FM — frequency modulation
• CDV — Compressed Digital Video
• CSAA — Central Service Area Authority
• SM — Statistical Multiplexing
• DRFM — Digital Radio-Frequency Memory
• EST — Electroshock Therapy
• VRT — Voltage Reduction Technology
• DUV — Data-Under-Voice
• DNI — Data Network Interface
• RSI — Record Status Indicator
• LQC — Line Quality Control
• PWM — Pulse width modulation
• RA — Return Alarm
• MTS — message transport system
• SLIC — Subscriber Loop Interface Circuit
• B8ZS — Binary Eight Zero Substitution
• CLP — Cell Loss Priority (ATM)
• VXML — Voice eXtensible Markup Language
• DNC — Do Not Call
• BCSM — Basic Call State Model
• CSDU — Core Service Data Unit
• RCF — Remote Call Forwarding
• CL — cell loss
• APTC — Atlantic Provinces Telecommunications Council
• CT — Control terminal
• BSSMAP — Base Station System Management Application Part
• MIN — Mobile Identification Number
• PSQM — Perceptual Speech Quality Measure
• MITI — Ministry of International Trade and Industry
• TTY — teletype terminal
• FIOS — Fiber Optic Services
• NDS — Novell Directory Services
• ARPT — Autorité de Régulation des Postes et Télécommunications
• TSM — Transaction State Machine
• EADAS — Engineering and Administrative Data Acquisition System
• WSP — Wireless Service Provider
• MSI — Maritime Safety Information
• PSC — Picture Start Code
• SYM — Symmetric
• OST — Office of Science and Technology

• CDA — Communications Decency Act's
• MIC — Management Integration Consortium
• BUFR — Binary Universal Form for the Representation (of data)
• BB — Blackberry
• ACNA — Access Customer Name Abbreviation
• RSL — Request and Status Links
• JDC — Japan Digital Cellular
• PLCP — Physical Layer Convergence Protocol (ATM)
• ASA — Avaya Site Administration
• ATRAC — Adaptive Transform Acoustic Coding
• KSU — Key Service Unit
• UNI — User-Network Interface
• DFE — Design For Environment
• MT — maintenance
• MODEM — modulation and demodulation
• 3G — Third Generation (mobile communication system)
• ECDIS — Electronic Chart Display Information System
• NLM — NetWare Loadable Module
• CIAC — Computer Incident Advisory Capability
• SDHLR — Super-Distributed Home Location Register
• GSTN — General Switched Telephone Network
• MMC — Microsoft Management Console (Microsoft)
• QR — Quality record
• EIR — Excess Information Rate
• CEE — Communaut? Economique Europ?enne
• PCS — Personal Communications Services
• CBS — Common Battery Signaling
• INWATS — INward Wide Area Telecommunications Service
• NEMP — Nuclear Electromagnetic Pulse
• DX — Duplex Signaling
• ATD — Advanced Technology Demonstration
• IPXCP — Internetwork Packet Exchange Control Protocol
• TTL — ToS and Time-to-Live
• CALA — Customer Address Location Area
• ERL — Echo Return Loss
• TVRO — Television Receive-Only
• WDF — Wireless Data Forum
• CDV — Cell Delay Variation(ATM)
• NSN — National Significant Number
• ALI — Automatic Location Identifier
• JTF — Joint Task Force
• DPST — Double-Pole Single-Throw
• TC — Technical Committee (HL7)
• HDTV — High-Definition Television
• TACACS — Terminal Access Controller Access Control System
• NTSC — National Television Standards Committee
• SA — Selective Availability (on GPS transmissions)
• BSRF — Basic System Reference Frequency
• DMT — Discrete Multi-tone Transmission
• MPLS — Multi Protocol Label Switching

• ICLD — Inter-Channel Level Difference
• INAP — Intelligent Network Application Part
• SACS — Security Access Control System
• ALCAP — Access Link Control Application Protocol
• PRE — Preliminary
• LL — Lower Layer
• RS — Receive Signature
• WDS — Wireless Distribution System
• VC — Virtual Circuit (ATM)
• DF — Direction Finding or Finder
• DCF — Distributed Coordination Function
• BBCR — BroadBand Communications Research
• AEA — American Electronics Association's
• THL — Trans-Hybrid Loss
• EFIS — Electronic Flight Information System
• DLU — Digital Line Unit
• MSRN — Mobile Station Roaming Number
• DLT — Digital Line Termination
• WFG — Wireless Firewall Gateway
• DICOM — Digital Imaging and Communications in Medicine
• DI — Document Index
• TOMS — Telecom Operations Management System
• CLOS — Clear Line Of Sight
• ADCCP — Advanced Data Communication Control Procedures
• MFLOPS — Millions of Floating Point Operations per Second
• CCS — Common Command Set
• NMC — Network Model Coverage
• SMMR — Scanning Multichannel Microwave Radiometer
• B-CPE — Broadband Customer Premises Equipment
• DCS — Defense Communications System
• CSA — Canadian Standards Association (like UL)
• CVSD — Continuous Variable Slope Detection
• DCSS — Digital Cross-connect Systems
• IS — Integrated Services
• MBE — Molecular Beam Epitaxy
• CDDI — Copper Distributed Data Interface
• WIG — Wireless Internet Gateway
• DXI — Data Exchange Interface
• E2E — End-to-End
• EMS — Enhanced Messaging Service
• VQV — Voice Quality Value
• HTO — Hellenic Telecommunications Organisation
• ADM 3X — DS3 Add-Drop Multiplex
• VVP — Versatile Voice Processing
• ECS — Environmental Control System (Subsystem)
• 3G HSPA — Third-Generation High-Speed Packet Access
• ADC — Advanced Data Control
• STD — Secondary Telecom District
• BSC — Base Station Controller
• PNA — Parallel Network Architecture

• BT — Back Trace
• IXC — interexchange carrier
• PSK — Phase Shift Key
• PMMA — Polymethyl Methacrylate
• SVC — Signaling Virtual Channel
• RADINT — Radar Intelligence
• MDN — Mobile Directory Number
• MDCP — Media Device Control Protocol
• DPBX — Digital Private Branch Exchange
• TIA — Telecommunications Industry Association
• E — Echo Time Zone
• CICS — Customer Information Control System (IBM Mainframe Software; Kicks Or C-I-C-S)
• PTT — Push to Talk Taster
• TR — Temporal Reference
• RNR — Receive Not Ready
• RADSL — Rate Adaptive Digital Subscriber Line
• FPLMTS — Future Public Land Mobile Telecommunications System
• STD — Standard Deviation
• PET — positron emission tomography
• DPDCH — Dedicated Physical Data Channel
• DTS — Digital Terminal Systems
• DEM — Digital Elevation Model
• AEE — Agent Execution Environment
• CAAS — Communications-as-a-Service
• HUMAN — High-speed Unlicensed Metropolitan Area Network
• ACE — Authentication Encryption
• SR — Service Request
• STM — Scanning Tunneling Microscopy
• SYSADM — System Administrator
• SIMT — Système interbancaire marocain de télécompensation
• NSP — National Signaling Point
• CDF — Communications Data Field
• CGI — Computer Graphics Interface
• MBMS — Multimedia Broadcast/Multicast Service
• TAU — Test Access Unit
• PRM — Premium Rate
• WTP — Wireless Transaction Protocol
• OID — Object Interaction Diagram
• ARD — Automatic Ring Down
• 4WA — Four Wire Analog
• BDSL — Broadband Digital Subscriber Line
• 1-ESS — x-ESS series of Electronic Switching Systems
• CHTML — Compact Hypertext Markup Language
• DQDB — Distributed Queue Double Bus
• ILETS — Idaho Law Enforcement Telecommunication System
• T1 — Transmission service at the DS1 rate of 1.544 Mbps
• TOP — technical/office protocol
• AVT — Audio Visual Telecommunications
• BS — Busy Season
• LAT — Local Area Transport (network)

• ONE — Other Network Entity
• LRM — Long Reach Multimode
• TXM — Transmission X-ray Microscope
• ECAN — Echo Cancellation
• FRAD — Frame Relay Access Device
• FTAM — File Transfer Access and Management
• FIC — Flight Information Center
• SASL — Simple Authentication and Security Layer
• SCO — Synchronous Connection Oriented
• WLAP — Wireless LAN (Local Area Network) Access Point
• NSE — Network Software Environment
• PTO — U.S. Patent And Trademark Office
• TSAU — Time Slot Access Unit
• ROW — Rest Of World
• TDR — Time-Domain Reflectometry
• SAPI — Service Access Point Identifier
• BNCC — Base Network Control Center
• TD-CDMA — Time Division - Code Division Multiple Access
• IVI — Intel Video Interactive
• BUS — Business Units
• BAC — Bar Calls
• ADTS — Ameritech Digital Transport Service
• DDD — Direct Distance Dialing
• PCIA — Personal Communications Industry Association
• PPV — Pay-Per-View
• RBT — Ring Back Tone
• LIU — Line Interface Unit
• TSDU — Transport Service Data Unit
• 3GIP — Third Generation Internet Protocol
• TAE — Terminal Adapter Equipment
• MTA — Message Transfer Agents (Internet)
• LDI — Long Distance Interconnect
• PTT — Post Telegraph and Telecommunications
• DMT — Digital-Discrete Multi-Tone
• CPS — Cycles Per Second (now Hertz)
• IEEE-SA — Institute of Electrical and Electronics Engineers - Standards Association
• PNE — Path Number Efficiency
• JMA — Japanese Meteorological Agency
• RADARSAT — Radar Satellite
• IDC — Information Distribution Company
• TPSP — Third Party Service Provider
• CLI — Calling Line Identification
• MMSI — Maritime Mobile Service Identity
• RLA — Received Level Average
• AIU — Analog Interface Unit
• JWG — Joint Working Groupof
• WITS — Web Interface for Telescience
• MUSIC — MUltiple SIgnal Classification
• ACL — Asynchronous Connection-less Link
• CCSS6 — Common Channel Signaling System # 6

• RCMAC — Recent Change Memory Administration Center
• STDM — Statistical Time Division Multiplexing
• RTNR — Real-Time Network Routing
• FDOA — Frequency Difference Of Arrival
• ATL — Advanced Technology Laboratory
• L2F — Layer 2 Forwarding protocol
• UTP — Universal Transmission Protocol
• PT — Payload Type (ATM)
• FEAC — Far End Alarm and Control
• CACM — Communications of the ACM
• ACOU — Additional Call Offering Unrestricted
• DF — Distributing Frame
• HFC — Hybrid Fiber/Coaxial network
• ML — maximum length
• ANSI — Advanced Network Signaling Input
• PR — Preference
• CAM — Computer-Aided Manufacturing
• IESG — Internet Engineering Steering Group
• ATOM — Any Transport over MPLS (Multi-Protocol Label Switching)
• DOITT — Department of Information Technology and Telecommunications
• CTTC — Centre Tecnològic de Telecomunicacions de Catalunya
• EGPRS — Enhanced General Packet Radio Service
• FSK — Frequency Shift Keying
• DACS — Digital Access Carrier System
• E — Exchange
• ANSI-41 — ANSI standard for mobile management
• TMF — Telecommunications Management Forum
• WCRL — Wireless Communications Research Laboratory
• DIP — Dialup Internet Protocol
• GERAN — GSM (Global System for Mobile communications) Edge Radio Access Network
• MSC — Mobile Switching Center
• LCAS — Link Capacity Adjustment Scheme
• IQ — In-phase and Quadrature
• CDVT — Cell Delay Variation Tolerance
• WCMP — Wireless Control Message Protocol
• IMPI — IP (Internet Protocol) Multimedia Private Identity
• DHA — Dialogue Handling
• ITW — International Telecoms Week
• MMC — Minimum Monthly Charge
• LEC — Liquid Encapsulated Czochralski
• WBI — Wireless Broadband Internet
• DCEF — Distributed Cisco Express Forwarding
• EECM — End-to-End Call Manager
• PDSO — Packet Data Security Overlay
• ARFA — Allied Radio Frequency Agency
• AGPS — Assisted Global Positioning System
• DE — Discard Eligible
• PTM — Packet Transport Mode
• B6ZS — Bipolar 6 Zero Substitution
• DLC — Digital Leased Circuit

• BHCA — Busy Hour Call Attempts
• SS1 — Signalling System 1 (500/20 Hz tones)
• FAT — Final Acceptance Testing
• RZ — Return to Zero
• CASP — Communications Application Service Provider
• 3-D — 3-Dimensional
• CON — Concentrator
• VSM — Vestigial Sideband Modulation
• ABATS — Automatic Bit Access Test System
• BSID — Base Station Identity
• VF0 — Voice Fundamental Frequency
• IDCU — Integrated Digital Carrier Unit
• LSP — Label Switched Path
• V — Vector
• SVGA — Super VGA
• TARP — Target Identifier Address Resolution Protocol
• SNI — Service Node Interface
• MHL — Mobile High-definition Link
• ASTE — Advanced Systems and Telecommunications Equipment
• NDIS — Network Driver Interface Specification (Microsoft Windows NT)
• HTML — Hyper-Text Markup Language
• LULT — Line Unit/Line Termination
• SLBM — Submarine-launched ballistic missile
• USRT — Universal Synchronous Receiver/Transmitter
• FTS — Federal Telecommunications System
• TFL — Telecom Fiji Limited
• CFOT — Certified Fiber-Optic Technician
• CYTA — Cyprus Telecommunications Authority
• CRBT — Color Ring Back Tone
• LRF — Laser Range Finder
• 4G — Fourth Generation
• MEAS — Measure
• DEO — Digital End Office
• SLC — Service Level Contract
• VPC — Virtual Path Connection (ATM)
• CERN — Conseil Europeen Pour La Recherche Nucleaire
• CD — Critical Dimension
• ELFEXT — Equal-Level Far-End Cross-Talk
• F/W — Firmware
• WPKI — Wireless Public Key Infrastructure
• FLN — Fixed Line Network
• SQE — Signal Quality Error
• GTXC — Global Telephone Exchange Carrier
• WUP — Wired Up Privacy
• MTP — Message Transfer Part
• CSAR — Combat Search and Rescue
• LSI — Large-Scale Integration
• SSU — Synchronization Supply Unit
• LFTYR — Ley Federal de Telecomunicaciones y Radiodifusión
• DNSIX — Defense Network Security Information Exchange

• MAHO — Mobile Assisted Handoff
• DPT — Dial Pulse Terminate
• HFC — Hybrid Fiber Coaxial
• VCT — Variable Cam Timing
• WDSL — Wireless Digital Subscriber Line
• KTS — Key Telephone System
• CTIT — College of Telecommunications and Information Technology
• RANAP — Radio Access Network Application Part
• TDM — Time Division Multiplexing
• STN — Station Casinos, Inc.
• DDI — Direct Dialing Incoming
• LR-WPAN — Low-Rate Wireless Personal Area Network
• ODS — Operational Data Store (knowledge management)
• NB — Narrowband
• MM — mismatch
• NML — Network Management Layer
• SGCP — Simple Gateway Control Protocol
• ATCA — Advanced Telecom Computing Architecture
• CARS — Community Antenna Relay Service
• RPCU — Radio Port Control Unit
• ARDIS — Advanced Radio Data Information Service
• PTAM — Professional Telephone Answering Machine
• SETI — Search for Extraterrestrial Intelligence
• SUS — Suspension
• GSM — Global System for Mobile telecommunications
• CSI — Clearing Subnetwork Identification
• BUS — Broadcast and Unknown Server
• USF — Universal Server Farm
• FWS — Fixed Wireless Services
• REA — Rural Electrification Administration (US)
• IS-41 — TIA/EIA Interim Standard for mobile management
• SH — Shell
• AFI — Authority and Format Identifier
• NSDI — National Spatial Data Infrastructure
• KB — Knowledge-Based
• VHM — Voice Health Monitor
• AADS — Ameritech Advanced Data Services
• TWX — Teletypewriter Exchange (Telex)
• UBR — Unspecified Bit Rate
• TJB — Telephone Junction Box
• TMTC — Telemetry and Telecommand
• NETBIOS — Network Basic Input-Output System
• UPC — Usage Parameter Control
• TTIL — Team Telecom International Ltd.
• RDSS — Radio Determination Satellite Service
• APTG — Asia Pacific Telecom Group
• DS-3 — Digital Signal, Level 3
• CIS — Communications and Information Systems
• DA — decanoic acid
• FEBE — Far End Block Error (SONET)

• A/C — Air Conditioner
• DMB — Disconnect and Make Busy
• RTZ — Rate for Transmission service for a Zone load
• ADPCM — Adaptive Differential Pulse Code Modulation
• IV&V — independent verification and validation
• NMF — Network Management Forum
• BIC — Bus Interface Controller
• PNP — Positive-Negative-Positive
• LO — Lockout
• DQR — Directory enQuiry Restricted
• MRVT — MTP Routing Verification Test
• IEEE-CS — Institute of Electrical and Electronics Engineers Computer Society
• ADTS — Automated Digital Terminal System
• WICD — Wireless Interface Connection Daemon
• ISO — Independent System Operator (US) (see also TSO) Responsible for grid management, but does not own assets. (electricity)
• ITT — Invitation To Tender
• STAN — Supply of Telstra Account Number
• ACRE — Authorization and Call Routing Equipment
• VAD — Voice Activity Detection
• DMT — Discrete Multi-Tone
• EC — Echo Cancelling
• MC — Management Center
• SVW — Sioux Valley Wireless
• CNID — Calling Number Identification Display
• HDSL — High-bit-rate Digital Subscriber Line
• WAWS — Washington Area Wideband System
• T&R — Tip and Ring
• A/D — Analog-to-Digital converter
• DBRNC — deciBel Relative to Noise in a Circuit
• GRX — GPRS Roaming Exchange
• P — Point
• RSN — Regional Service Network
• ANT — ADSL Network Terminator
• 3GSM — Third-generation Global System for Mobile (communications)
• ZD — Zero Defects
• CNE — Certified Novell Engineer
• WIAS — Wholesale Internet Access Services
• WNMS — Wireless Network Management System
• MO — Magneto-optic
• LAPB — Link Access Protocol-Balanced
• CD — Committee Draft
• CM — Common Mode
• TCM — Tandem Connection Maintenance
• FLL — Fixed-Loss Loop
• FOTS — Fiber Optical Transmission System
• TMSI — Temporary Mobile Subscriber Identity
• ISM — Interstellar Medium
• SMSL — Standard Multimedia Scripting Language
• HSCSD — High-Speed Circuit-Switched Data
• PTP — Point to Point Transmission Service (electricity)

• TRLR — Trailer
• BTU — Basic Transmission Unit
• DNU — Do Not Use
• ML-PPP — Multilink Point-to-Point Protocol
• LGE — Loop- or Ground-start Exchange
• CD ROM — Compact Disc Read-Only Memory
• BMAS — Business Management System
• ESSE — Embedded Systems Software Environment
• LAC — Line Assignment Center
• IPD — Intelligent Pulse Decoding
• CRACK — Challenge Response for Authenticated Crypto Keys
• GOSIP — Government Open Systems Interconnection Profile
• RDTD — Restricted Differential Time Delay
• CD-ROM — Compact Disk-Read-Only Memory
• O — objective
• KEK — Key Encrypting Key
• S-HTTP — Service Hypertext Transport Protocol
• BONDING — Bandwidth On Demand Interoperability Group
• UAT — Universal Access Transceiver
• CCH — Common Channel Handler
• CAP — Competitive Access Provider
• DORA — EV-DO (EVolution-Data Optimized) standard Revision A
• ICTA — Idaho Cable Telecommunications Association
• ATTRA — Appropriate Technology Transfer for Rural Areas
• VDV — Voice/Data/Video
• BCIX — Berlin Commercial Internet Exchange
• CAE — Common Application Environment
• RQMTS — Requirements
• THP — Terminal Handler Process
• LCGN — Logical Channel Group Number
• CC — Connection Confirm
• IVN — Interactive Video Network
• TCPA — Telephone Consumer Protection Act
• EEROM — Electronically Erasable Read-Only Memory
• FEM — Finite Element Method
• ASIC — Application Specific Instruction Code
• DDS — Dataphone Digital Service (AT&T)
• CCR — Current Cell Rate (ATMF)
• CCSA — Common Control Switching Arrangement
• AQP — Association for Quality and Participation
• CFS — Call for Service
• ILETS — International Law Enforcement Telecommunications Seminar
• APPN — Advanced Peer-to-Peer Network
• DCMES — Dublin Core Metadata Element Set
• RPV — Resource Property Value
• EF&I — Engineering, Furnishing and Installation
• RCH — Receive Channel
• GTM — Go to Meeting
• CUG — Closed Users Group
• AAPR — Annual Average Performance Ratio

• NC — Network Computer (PC Internet)
• CNT — Corporacion Nacional de Telecomunicaciones
• WTNM — Working Telephone Number Management
• TXS — Telephone eXchange Strowger
• APS — Affordable Portable Services
• BCST — Broadcast
• TPC — The Phone Company
• SCORM — Shareable Content Object Reference Model
• WSN — Wireless Sensor Network
• TRANS — Transaction
• CCEA — Cross Connect Equipment Assignment
• LSAP — Link Layer Service Access Point
• TBRL — Terminal Balance Return Loss
• CCC — Credit Card Calling
• RJ-14 — Registered Jack type 14 (2-wire connector)
• NMC — Nortel Matra Cellular
• AA — Auto-Answer
• COB — Change Of Billing
• EDGE — Enhanced Data for GSM (Global System for Mobile communication) Evolution
• PMOS — P-channel Metal Oxide Semiconductor
• AMTI — Airborne Moving Target Indicator
• UAC — Uniform Annual Charge
• GOS — Gerry Otis Simpson
• WIRC — Wireless Information Resource Center
• ASP — Active Signaling Protocol
• ASAS — All-Source Analysis System
• MVPRP — Multivendor Problem Resolution Process
• IPCU — iPhone Configuration Utility
• CLEC — Competitive Local Exchange Carrier
• COAM — Customer Owned And Maintained
• WRED — Weighted Random Early Detection
• WBMP — Wireless Bitmap
• CNAD — Calling Name Delivery
• VAN — Value-Added Network
• QPA — Quality Performance Analysis
• NSEP — National Security Emergency Preparedness
• CFNA — Call Forwarding No Answer
• ANCD — Automatic Network Call Distrubution
• CSCC — coordinated state change control
• CMI — Computer Managed Instituteuction
• NRI — Net Radio Interface
• PPCH — Packet Paging Channel
• ECTF — Enterprise Computer Telephony Forum
• ILQ — Inbound Link Quality
• REGEN — Regenerator
• WDRM — Wireless Design Reference Manual
• ARCNET — Attached Resource Computer Network
• STE — Syrian Telecommunications Establishment
• REN — Ringer Equivalence Number
• STE — Software Test Environment

• SAMA — Spread Aloha Multiple Access
• NICAD — Nickel Cadmium
• BGP4 — Border Gateway Protocol 4
• BTS — Base Transceiver Station (cellular)
• SMT — station management (protocol)
• MCF — Message Confirmation Frame
• DMT — Discrete Multi-Tone Technology
• L — Lambert
• LBX — Low Bandwidth X
• PVRA — Physical Volume Reserved Area
• FCT — Fixed Cellular Terminal
• VOFR — Voice Over Frame Relay
• WCM — Wireless Connection Manager
• BANC — Broadband Access Network Coordination
• SUBT — Subscriber Terminal
• CTS — Call Tracking System
• ATSC — Advanced Television Systems Committee
• ITOC — Independent Telephone Operating Company
• DDSD — Delay Dial Start Dial
• ATMS — automatic transmission measuring system
• WIPI — Wireless Internet Platform for Interoperability
• KSR — Key Send Receive
• NTE — Network Terminating Equipment
• CSL — component sublayer
• AEIMP — Apple Event Interprocess Messaging Protocol
• MEID — Mobile Equipment Identifier
• UR — User Rate
• DAMPS — Digital Advanced Mobile Phone System
• BFS — Broadcast File System
• MSG — Management Steering Group
• NRZ — Nonreturn To Zero
• ACMA — Atlantic Cable Maintenance Agreement
• SPCS — Stored Program Control Switch
• DISA — Direct Inward Switch Access
• BATM — Basic Telecommunication Access Method
• DCB — Digital Channel Bank (Sprint)
• PAGCH — Paging and Access Grant Channel
• PMD — Physical Media-Dependent
• SNI — Subscriber-Network Interface
• RDF — Remote Distribution Frame
• HBH — Hop-By-Hop
• SQR — Signal to Quantizing noise Ratio
• BASH — Bandwidth Sharing
• DRTL — Dial Repeating Tie Line
• CMIS — Common Management Information Service
• GOSIP — Government Open System Interconnection Profile
• DSP — Domain Specific Part
• KSPS — KiloSymbols Per Second
• M2M — Multipoint-to-Multipoint
• MMDX — Multi-Media Data Services

• YIP — Your Internet Phone
• RBOC — Regional Bell Operating Company (Baby Bell)
• CP — Cell Phone
• CCO — Component Coordinator
• SPC — Service Provider Code
• CMAS — Cellular Management System
• UVG — Universal Voice Grade
• SAP — Service Advertising Protocol
• TCAP — Transaction Capabilities Application Part
• SCSA — Standard Consolidated Statistical Area
• PLM — Product Line Manager
• FOE — Fiber Optic Equipment
• UOS — Units of Service
• NTSA — Networking Technical Support Alliance
• ESM — electronic support measure
• CAIRO — Communications Audio Interface for Remote Operations
• WTK — Wireless Toolkit
• CDRM — Cross-Domain Resource Manager
• CODASYL — COnference on DAta SYstems Languages
• DOV — Data-Over-Voice
• TTY — Text Teletype
• AAL5 — ATM (Asynchronous Transmission Mode) Adaptation Layer 5
• ECTEL — Eastern Caribbean TELecommunications Authority
• IPR — Intellectual Property Right
• CDPD — Cellular Digital Packet Data
• LSMS — Local Service Management System
• PTI — Payload Type Indicator
• AIS-P — Alarm Indication Signal - Path
• PHIGS — Programmer's Hierarchical Interactive Graphics System
• NESC — National Electrical Safety Code
• CDSL — Consumer Digital Subscriber Line
• DAS — Distributed Antenna System
• CAL — Customer Access Line
• AFCEA — Armed Forces Communications and Electronics Association's
• MSS — Mobile Satellite Service
• BPOP — Building Point of Presence
• CUSA — Central Urban Service Area
• DCS — Digital Cross-connect Switch
• OODBMS — Object-Oriented Database Management Systems
• ANAC — An Automatic Number Announcement Circuit
• 2G — Second-generation mobile telephone system
• IMMAT — Instituto Municipal Malvinas Argentinas Telecomunicaciones
• QOTS — Quality Of Telephone Services
• WTA — Wireless Telephony Application
• RACE — Research for Advanced Communications in Europe
• NIMH — Nickel-Metal Hydride
• DOR — Detailed Outage Report
• MIS — Management Information Service