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Computing & IT >> Telecom Abbreviations

Look through 4999 acronyms and abbreviations related to Telecom:

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

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

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

• VAT — Value Added Tax
• CEO — Chief Executive Officer
• ASME — American Society of Mechanical Engineers
• EOM — End Of Message
• Y2K — Year 2000
• CGI — Common Gateway Interface
• BSD — Berkeley Software Distribution
• CAUCE — Coalition Against Unsolicited Commercial Email
• MOU — Memorandum of Understanding (an MOU between Food & Drug Administratin and a regulatory agency in another country allows mutual recognition of inspections)
• APT — Automatic Picture Transmission
• STS — Space Transportation System
• SDMA — Space Division Multiple Access
• DSA — Digital Signature Algorithm
• AIS — Automated Information System
• ADSL — Asymmetric Digital Subscriber Line
• R&D — Research & Development
• HSD — High Speed Data
• AAC — Advanced Audio Coding
• ATM — Asynchronous Transfer Mode
• ADD — Addendum
• ACD — Automatic Call Distributor
• PDF — Portable Document Format (created by Adobe Acrobat)
• WBS — Work Breakdown Structure
• MST — Mountain Standard Time
• PDT — Pacific Daylight Time
• RDY — Ready
• ADM — Add/Drop Multiplexer
• AES — Auger Electron Spectroscopy
• EFF — Electronic Frontier Foundation
• MRI — Magnetic Resonance Imaging
• WAN — Wide Area Network
• AIR — Account Information and Refill
• BRB — Be right back
• X-BAR — Crossbar telephone exchange
• ASTM — American Society for Testing and Materials (Philadelphia, Pennsylvania)
• SAN — Storage Area Network
• COR — Carrier Operated Relay
• API — Application Programming Interface
• DDL — Data Definition Language
• CR — Carriage Return
• ATCRBS — Air Traffic Control Radar Beacon System
• THX — Thanks
• DMSP — Defense Meteorological Satellite Program (U.S.)
• PUHU — Pick Up Hang Up
• AM — Ante Meridian
• FIFO — First In, First Out
• UAV — Unmanned Aerial Vehicle
• ABC — activity based costing
• CAE — Computer-Aided Engineering
• CCIS — Common Channel Interoffice Signaling

• IPO — Initial Public Offering
• BTU — British Thermal Unit
• EST — Eastern Standard Time
• RNC — Radio Network Controller
• GPRS — General Packet Radio Service
• ADR — Address
• SCSI — Small Computer System Interface
• DME — Distance Measuring Equipment
• NIC — Network Interface Card
• ABR — Available Bit Rate
• AME — Amplitude Modulation Equivalent
• EW — Electronic Warfare
• PCB — printed circuit board
• S X S — Step-by-Step
• SLA — Service Level Agreement
• RFC — Request For Comment
• AC — Access Control
• SRAM — Static Random Access Memory (ess-ram)
• VVX — Voice and Video eXchange
• WWW — World Weather Watch
• DOA — dead on arrival
• EC — European Commission
• CIO — Chief Information Officer
• AOA — Angle Of Arrival
• TCB — Trusted Computing Base
• CIR — Committed Information Rate (Frame Relay)
• JV — Joint Venture
• 100BASE-T2 — 100 Megabits per Second, Baseband, Two-pair Category 3 UTP cables
• VR — Virtual Reality
• RDBMS — Relational Database Management System
• ASCII — American National Standard Code for Information Interchange
• ARPA — Advanced Research Projects Agency (made early internet)
• FAA — Federal Aviation Administration
• SCC — Standards Council of Canada
• B-ICI — Broadband Inter-Carrier Interface
• WLTF — Wireless LAN (Local Area Network) Task Force
• VHF — Very High Frequency
• EPA — Environmental Protection Agency (US)
• BECN — Backward Explicit Congestion Notification
• AVHRR — Advanced Very High Resolution Radiometer  
• SXS — Step-By-Step
• MTBF — Mean Time Before Failure
• TCP — Transmission Control Protocol
• ASR — Airport Surveillance Radar
• FX — Foreign Exchange
• AM — Amplitude Modulation
• XA-FR — Exchange Access Frame Relay
• URL — Universal Resource Locator
• AD — Active Directory
• RAEX — Roaming Agreement EXchange

• EBCDIC — Extended Binary Coded Decimal Interchange Code (pronounced Eb-see-dik) (cf. BCD)
• CPT — Carriage Paid To
• QI — Quality Improvement
• ASK — amplitude shift keying
• RPC — Remote Procedure Call
• ACL — Access Control List
• GUI — Graphical User Interface (goo-ey)
• DB — Decibel
• SD — Standard Deviation
• A-KEY — Authentication key
• CU — Control Unit
• SLF — Super Low Frequency
• NPI — New Product Introduction
• CB — Call Back
• S-BCCH — Short Message Service Broadcast Control Channel
• ATF — Advanced Tactical Fighter
• DMTS — Distinguished Member Of Technical Staff
• ERP — Enterprise Resource Management
• CBC — cipher block chaining
• DTX — Discontinuous Transmission
• SP — Service Provider
• DES — Data Encryption Standard
• JAXA — Japan Aerospace Exploration Agency
• CPM — Critical Path Method
• UPS — Ultraviolet Photoelectron Spectroscopy
• NATO — North Atlantic Treaty Organisation
• RAM — random-access memory
• SWAG — Scientific Wild Ass Guess
• DHCP — Dynamic Host Configuration Protocol
• CIS — Commonwealth of Independent States
• QMS — Quality Management System
• SLIP — Serial Line Interface Protocol
• WAFB — Wireless Absolute Fairness Bound
• DTE — Data Terminal Equipment
• CCTV — Closed-circuit television
• CDR — Call-Detail Record
• X-ON — Transmitter On
• NIH — Not Invented Here
• DFS — Distributed File System
• IM — Instant Message
• IRLAN — Infrared LAN
• GPS — Global Positioning System (ex-NAVSTAR)
• APIC — Advanced Programmable Interrupt Controller
• TC — Telephone Call
• I/O — Input/Output
• EMG — Electromyogram
• ICT — Information and Communication Technology
• X-OFF — Transmitter Off
• CFE — Contractor-Furnished Equipment
• RU — Are You?

• SME — Subject Matter Expert
• MOB — Mobile
• QOS — Quality of Service
• ATS — applications technology satellite
• ATM — Adobe Type Manager
• SDR — Special Drawing Rights
• DMX — De-MultipleXer
• EU — European Union (1994; formerly referred to as the EEC or EC)
• SIG — Special Interest Group
• GRE — Generic Routing Encapsulation
• LCP — Link Control Protocol
• ACFQ — Absence Compensation Fair Queuing
• CMI — Computer Managed Instruction
• NPV — Net Present Value {economics}
• SQA — Software Quality Assurance
• USB — Universal Serial Bus
• AP — Application Protocol
• TAC — Technical Assistance Center
• WB — Welcome Back
• CIM — Corporate Information Management
• Q&A — Question & Answer
• MSN — Microsoft Network
• MDA — Monochrome Display Adapter
• RACON — Radar Beacon
• ISO — Infrared Space Observatory
• PLMN — Public Land Mobile Network
• ISRO — Indian Space Research Organisation
• CRL — Certificate Revocation List
• YGWYPF — You Get What You Pay For
• CAM — Computer-Aided Mapping
• BS — Base Station
• UHF — Ultra High Frequency (300-3000 MHz; 1m-10cm)
• NMT — Nordic Mobile Telephone
• CM — Configuration Management
• VIRUS — Vital Information Resources Under Siege
• TTYL — Talk To You Later (Internet Slang)
• ADPE — Automatic Data Processing Equipment
• SAS — Statistical Analysis System
• H323 — ANSI standard for format over IP
• RM — Resource Management
• CC — Carbon Copy
• TNSTAAFL — There's No Such Thing As A Free Lunch
• MAC — Message Authentication Code
• IMPACT — Integrated Manufacturing Precision Assembly Cellular Technology
• PO — Purchase Order
• PAR — Precision Approach Radar
• WACN ID — Wide Area Communications Network IDentifier
• FFT — Fast Fourier Transform
• B3ZS — bipolar 3-zero substitution
• PVT — Private

• DIT — Directory Information Tree
• PDN — Public Data Network
• FCW — Federal Computer Week
• ATC — Air traffic control
• AE — Application Entity
• MIC — Message Integrity Check
• ACE — Advanced Computing Environment
• ACM — Association for Computing Machinery
• TBD — To Be Determined
• SGML — Standard Generalized Markup Language
• PLD — Programmable Logic Device
• CRT — Cathode Ray Tube (type of TV)
• SMS — Short Message Service
• BBU — Baseband Unit
• AGP — Accelerated Graphics Port
• OMG — Object Management Group
• AAAI — American Association for Artificial Intelligence's
• EAP — Extensible Authentication Protocol
• DNS — Domain Name System
• EDS — Electronic Data Systems Corporation
• M — Meter
• DSA — Directory System Agent
• VDS — Variable Depth Sonar
• C-NBAP — Common Node B Application Part
• OSS — Operational Support System
• TPDU — Transport Protocol Data Unit
• BCC — Blind Carbon Copy
• PM — Preventive Maintenance
• ZDBOP — Ziff-Davis Benchmark Operation
• LEO — Low Earth Orbit (satellite communications)
• TM — Technical Manual
• UAS — Unavailable Seconds
• MS — Message Store
• DARPA — Defense Advanced Research Projects Agency (US)
• ACK — Acknowledge (telecommunications; Cf. NAK)
• PNG — Portable Network Graphics (graphic file standard/extension)
• MOS — Model Output Statistics
• VTC — Video Teleconference
• CDS — Cell Directory Service
• BPRZ — Bipolar Return-to-Zero
• DLR — Design Layout Record
• EVP — Executive Vice President
• D-NBAP — Dedicated Node B Application Part
• DRAM — Dynamic Random Access Memory (dee-ram) (computing)
• DLC — Digital Loop Carrier
• EGA — Enhanced Graphics Adapter
• AT — Access Tandem
• AE — Account Executive
• ME — Mobile Equipment
• JIS — Japanese Industrial Standard

• DC — Direct Current
• IVR — Interactive Voice Response (telephone technology)
• AF — Audio Frequency
• HDLC — High-Level Data Link Control
• AGC — Automatic Gain Control
• TV — Television
• NYSE — New York Stock Exchange
• TS — Technical Specification
• SDD — Software Design Document
• ICMP — Internet Control Message Protocol
• HSDPA — High-Speed Downlink Packet Access
• FDDI — Fiber Distributed Data Interface
• AT — Advanced Technology
• P&L — Profit and Loss statement
• CC — Call Control
• IS — Intermediate System
• MS — Mobile Station
• AML — Amplitude Modulated Link
• PAL — Programmable Array Logic
• CERT — Computer Emergency Response Team
• ABET — Accreditation Board for Engineering and Technology, Inc.
• UAX 14 — Unit Automatic eXchange type 14
• RCU — Remote Control Unit
• ADF — Automatic Direction Finder
• LLC — Logical Link Control
• FC — Fibre Channel
• RIP — Routing Information Protocol
• CIC — Circuit Identification Code
• PGP — Pretty Good Privacy (encryption)
• CAD — Computer Aided Designer
• OSI — Open Systems Interconnection (iso Standard)
• EEC — European Economic Community (predecessor of the European Union|EU)
• IW — Information Warfare
• DT — DWDM (Dense Wavelength Division Multiplexing) Terminal
• CBT — Computer Based Training
• RCC — Rescue Coordination Center
• CBDS — Connectionless Broadband Data Service
• YP — Yellow Pages
• MPI — Message Passing Interface
• MF — Medium Frequency
• RFI — Radio Frequency Interference
• CIM — Common Information Model
• COMJAM — Communications Jamming
• IETF — Internet Engineering Task Force
• ADT — Abstract Data Type
• QA — Center for Quality Assurance in International Education
• CS — Cable Select
• COO — Cost of Ownership
• CU — See You
• CLNP — ConnectionLess-mode Network Protocol

• TOS — Type Of Service
• QAM — quadrature amplitude modulation
• SEI — Software Engineering Institute
• OBO — Or Best Offer
• VM — Virtual Machine
• MHS — Microwave Humidity Sounder
• ENIAC — Electronic Numerical Integrator And Computer
• Z — Zero
• 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.
• OSPF — Open Shortest Path First (ATM)
• DOD — United States Department of Defense
• NSF — National Sanitation Foundation
• E-LEAD — Ear Lead
• FAQ — Frequently Asked Questions (sometimes Pronounced Fak)
• MIS — Management Information System (OSHA)
• CW — Continuous Wave
• COO — Chief Operation Officer
• HW — Hardware
• LF — Low Frequency
• BCD — Binary-Coded Decimal
• IDT — Integrated Digital Terminal
• NSA — National Security Agency
• AFC — Automatic Frequency Control
• ARP — Address Resolution Protocol (ATM)
• PECVD — Plasma-Enhanced Chemical Vapor Deposition
• DPC — Destination Point Code
• SEM — Space Environment Monitor
• BBS — Bulletin Board System
• RAD — Rapid Application Development
• CAM — computer aided manufacturing
• CHAP — Challenge Handshake Authentication Protocol (ATM)
• TBD — To Be Decided
• WMAN — Wireless Metropolitan Area Network
• PDU — Protocol data unit (such as segment, packet, frame, etc.)
• BT — British Telecommunications
• ISS — International Space Station
• ECN — Explicit Congestion Notification
• LCN — Logical Channel Number
• NEC — National Electrical Code
• ZIP — Zone Improvement Plan
• BST — British Summer Time
• TLS — Transport Layer Security
• FA — Functional Area
• CUL — See You Later
• EEPROM — Electrically Erasable Programmable Read-Only Memory
• AR — Access Rate
• CEV — Controlled Environment Vault
• DQE — Detective Quantum Efficiency
• OCR — Optical Character Recognition
• LSR — Local Service Request

• WS — Workstation
• RPM — Revolutions Per Minute, (Rotations Per Minute)
• VPN — Virtual Private Network (ATM)
• NI — Network Interface
• VB — Visual Basic
• NAS — Network Access Server
• MS — Management System
• OTN — Optical Transport Network
• RFI — Request For Information. Sales department shorthand. Special priority when use in conjunction with RFN (see below).
• DOJ — Department of Justice (US)
• SSM — Source-Specific Multicast
• ARPU — Average Revenue Per User
• CABS — Carrier Access Billing System
• UAN — Universal Access Number
• VOP — Voice Over Packet
• MTTR — Mean Time To Repair
• I.LINK — IEEE 1394, High Performance Serial Bus, implementation
• DCE — Distributed Computing Environment
• PWD — Password
• MHS — Message Handling System (electronic)
• POP — Point Of Presence (Internet)
• ERT — Emergency Response Team
• ISDN — Integrated Services Digital Network
• DOM — Document Object Model
• RDP — Radar Data Processing
• F — Fellow
• DTR — Data Terminal Ready
• AS — Autonomous System
• PE — Polyethylene
• AMT — Amount
• SA — Scientific American
• E — Energy
• ISI — Inter-Symbol Interference
• DIS — Distributed Interactive Simulation
• COM — Component Object Model
• SOW — Statement Of Work
• ROI — Return on Investment
• DQPSK — Differential Quadrature Phase-Shift Keying
• IPX — Internetwork Packet Exchange
• FXO — Foreign Exchange Office
• UR — Your
• MS — Millisecond
• JSC — Johnson Space Center (Houston, TX)
• MC — Message Center
• DSS — Decision Support System
• STI — Speech Transmission Index
• AMI — Alternate Mark Inversion
• MVS — Multiple Virtual Storage
• AMD — Advanced Micro Devices, Inc. (producer of computer chips)
• AFSK — Audio Frequency Shift Keying

• PRF — Pulse Repetition Frequency
• PT — Project Team
• RAID — Redundant Array of Inexpensive Disks
• SEC — Software Engineering Center
• ATSR — Along-Track Scanning Radiometer
• RFS — Request For Service
• APC — American Power Conversion
• BRA — Basic Rate Access
• CO — Certificate of Origin
• HF — High Frequency
• SIL — Speech Interference Level
• VOD — Video On Demand
• EAS — Extended Area Service
• OM — Old Man
• RM — Regional Manager
• RTS — Request To Send
• PSTN — Public Switched Telephone Network
• DSSS — Direct Sequence Spread Spectrum
• NOTAM — Notice to Airmen
• NESDIS — National Environmental Satellite, Data, and Information Service
• ECO — Engineering Change Order
• GB — Gigabyte
• DDE — Dynamic Data Exchange (in software parlance)
• AAAS — American Association for the Advancement of Science
• OMS — Optical Multiplex Section
• SVC — Scalable Video Coding
• BER — Bit-Error Rate
• NTFS — New Technology File System
• NA — Not Applicable
• FCA — Free Carrier
• IP — Intelligent Peripheral
• IS — International Standard
• DMARC — Demarcation point
• COQ — Cost Of Quality
• URI — Uniform Resource Identifier
• CAC — Carrier Access Code
• MSR — Microwave Scanning Radiometer
• O&M — Operation and Maintenance
• ARPANET — ARPA Network
• TEC — Total Electron Content
• AU — Audio Unit
• CAA — Civil Aviation Authority
• ITSEC — Information Technology Security Evaluation Criteria
• AXE 10 — Series of electronic telephone exchanges from L.M. Ericsson
• ASR — Access Service Request
• ECT — Explicit Call Transfer
• DMA — direct memory access (computer term)
• CT — Computer Telephony
• CATV — Community Antenna Television
• UA — User Agent

• PMA — Physical Medium Attachment
• CLI — Command line Interface (Cabletron)
• SM — Senior Member
• MSE — Mobile Subscriber Equipment
• ZIP — Zone Information Protocol
• NLMS — Normalized Least Mean Square
• RACF — Resource Access Control Facility
• DAHDI — Digium/Asterisk Hardware Device Interface
• DOS — Disk Operating System
• TCP/IP — transmission control protocol/internet protocol
• JPL — Jet Propulsion Laboratory (California Institute of Technology) (NASA)
• ACR — Attenuation Crosstalk Ratio
• RT — Remote Terminal
• AMI — Advanced Metering Infrastructure
• T-CARRIER — Trunk Carrier
• VAC — Vacant
• CGI — Computer-Generated Imagery
• BR — Branch
• MLS — Multiple Listing Service
• TB — Terabyte
• CRM — Customer Relationship Management
• IN — Intelligent Network
• BACP — Bandwidth Allocation Control Protocol
• M-CSI — Mobility management CAMEL (Customized Applications for Mobile network Enhanced Logic) Subscription Information
• W3C — World Wide Web Consortium
• ERP — Enterprise Resource Planning
• MSU — Microwave Sounding Unit
• CIA — Central Intelligence Agency
• UL — Uplink
• SPI — Service Provider Interface
• SCP — Service Control Point
• SQL — Structured Query Language
• DA — Destination Address
• PCI — Peripheral Component Interconnect
• MP — Multilink Protocol
• AADC — Automated Area Distribution Center
• NIC — Network Information Center
• ES — Errored Second
• MD — Mediation Device
• 3G — Third Generation mobile phone network
• BPR — Business Process Re-engineering
• ISA — Industry Standard Architecture
• FR — Frame Relay
• EPR — Electron Paramagnetic Resonance
• SAIC — Science Applications International Corporation
• SOHO — Small Office Home Office
• DS — Digital Signal
• AQL — Acceptable Quality Level
• NIS — Network Information Service
• TOP — Technical Office Protocol

• FIPS — Federal Information Processing Standard
• JIT — Just in time
• DNIS — Dialed Number Identification Service
• CA — Certificate Authority
• RFO — Reason For Outage
• PRI — Primary Rate Interface (ISDN)
• IRS — U.S. Internal Revenue Service
• IEC — International Electrotechnical Commission
• LF — Line Feed
• LP — Low Pressure
• AFP — AppleTalk Filing Protocol
• PC — Personal computer (host)
• RCV — Receive
• ELINT — Electronic Intelligence Satellite
• DSTE — Digital Subscriber Terminal Equipment
• STP — Spanning Tree Protocol
• CDMA — Code Division Multiple Access (voice/data transmission)
• CAN — Campus Area Network
• BIS — Bureau of Indian Standards
• PDS — Protected Distribution System
• EDVAC — Electronic Discrete Variable Automatic Computer
• ARA — Apple Remote Access
• WPS — Wireless Priority Service
• WB — Write Back
• PGA — Programmable Gate Array
• SCTP — Stream Control Transmission Protocol
• WG — Working Group
• MDA — Model Driven Architecture
• DLL — Dynamic Link Library (computer file)
• DAP — Directory Access Protocol
• MCU — Multipoint Control Unit
• RH — Relative Humidity
• TN — Telephone Number
• PERT — Program Evaluation and Review Technique
• DCP — Design Change Package
• DASD — Direct Access Storage Device
• LED — law enforcement desk; light emitting diode
• DSL — Digital Subscriber Line
• CAB — Conformity Assessment Body
• P — Predicted
• TRM — Technical Reference Model
• TWT — Traveling Wave Tube
• AEC — Architecture, Engineering, Construction
• RA — Risk Analysis
• BT — BlueTooth
• LPE — Liquid Phase Epitaxy
• KISS — Keep It Simple Stupid
• ADC — Analog-Digital Converter
• LZ — Landing Zone
• AFS — Andrew File System

• AT&T — American Telephone & Telegraph
• PAN — Personal Area Network
• BYOD — Bring Your Own Device
• SNR — Signal-to-Noise Ratio
• FCP — Fibre Channel Protocol
• AMLCD — Active Matrix Liquid Crystal Display
• MRC — Monthly Recurring Charge
• ITU — International Telecommunication Union
• CAV — Constant Angular Velocity
• PIN — Personal Identification Number
• IIS — Internet Information Services
• AIS — Alarm Indication Signal
• DUP — Duplicate
• ADEOS — ADvanced Earth Observing Satellite (Japan)
• PUB — Publication (file name extension)
• TE — Traffic Engineering
• STM — Short Term Memory
• T-IC — T-interConnect
• CF — Compact Flash
• SPADATS — Space Detection And Tracking System
• SBC — Southwestern Bell Corporation
• LPC — Linear Predictive Coding
• 1000BASE-T — 1000 Megabits per Second, Baseband, Twisted Pair
• FE — Far End
• NIST — National Institute of Standards and Technology
• VAZO — Violating All-Zero Octet
• NTIA — National Telecommunications and Information Administration
• ASQC — American Society for Quality Control's
• DCS — Digital Cross-connect System
• PPB — parts per billion (109)
• NLM — National Library of Medicine (National Institutes of Health)
• VLL — Virtual Leased Line
• USD — United States Dollar
• EPABX — Electronic Private Automatic Branch Exchange
• M — Management
• WYSIWYG — What You See Is What You Get (pronounced Wizzy-wig. See Entry For Derived Acronyms)
• STK — Satellite Tool Kit
• SPC — Stored Program Control
• SNMP — Simple Network Management Protocol (ATM)
• CDT — Central Daylight Time
• FCS — Frame check sequence (Ethernet)
• LD — Long Distance
• GSA — U.S. General Services Administration
• NMS — Network Management System
• SVC — Switched Virtual Connection
• NCS — National Communications System
• ATN — Aeronautical Telecommunication Network
• DVP — Digital Voice Privacy
• CTS — Clear To Send
• AEW — Airborne Early Warning

• HZ — cycles per second (hertz)
• MAC — Media Access Control
• OAS — Organization of American States
• BNSC — British National Space Centre
• BIP — Band Interleaved by Pixel
• SVD — Singular Value Decomposition
• TG — Task Group
• CSAT — Customer Satisfaction
• CMM — Capability Maturity Model
• GDS — Global Distribution System
• NMR — Nuclear Magnetic Resonance
• OPC — Originating Point Code
• ASP — Application Service Provider
• SAN — System Area Network
• ADN — Advanced Digital Network
• OLAP — Online Analytical Processing
• EEG — Electro-EncephaloGram
• VOL — Volume
• MCSD — Microsoft Certified Solution Developer
• BS — Beam Splitter
• OS — Operating System
• BOC — Bell Operating Company
• STP — Signal Transfer Point
• ARC — Army Reuse Center
• FITS — Flexible Image Transport System
• SBC — Session Border Controller
• GOS — Grade Of Service
• PSD — Phase-Sensitive Detector
• FUP — Fair Use Policy
• BSOD — Blue Screen Of Death
• SABGW — System Architecture Evolution Gateway
• MOL — Manned Orbiting Laboratory
• ASR — Automatic Speech Recognition
• EOT — End Of Transmission
• ROFL — Rolling on the floor laughing
• EAC — Engineering Accreditation Commission
• VLF — Very Low Frequency
• DCOM — Distributed Component Object Model
• DBS — Direct Broadcast Satellite
• DID — Digital Information Display
• KBYTE — Kilobyte (103)
• PD — Public Domain
• DAL — Dedicated Access Line
• OC — Optical Carrier
• NOAA — National Oceanic and Atmospheric Administration (US)
• AOI — Area Of Interest
• VC-ATOD — Virtual Clearinghouse on Alcohol, Tobacco and Other Drugs
• CG — Coast Guard
• SSL — Secure Socket Layer
• AT&T — American Telephone and Telegraph (U.S. company, also known as "Ma Bell")

• PPP — Point-to-Point Protocol
• CNM — Customer Network Management
• BGP — Border Gateway Protocol (routing protocol)
• IS — Information System
• BPS — bits per second
• CTD — Cumulative Trauma Disorder
• SCN — Switched Circuit Network
• RTN — Regional Telecommunication Network
• Y — Yttrium
• AM — Activity Manager
• MTSO — Mobile Telephone Switching Office
• SIC — Standard Industrial Classification (Code)
• ATA — Analog Telephone Adapter
• ESS — Electronic Switching System
• HTTPS — HyperText Transfer Protocol Secure
• DDS — Digital Data Service
• CMS — Content Management System
• ECAC — European Civil Aviation Conference
• RFD — Request For Discussion
• CATV — Cable Television
• DIBL — Drain-induced Barrier Lowering
• ELF — Extremely Low Frequency
• RSVD — Reserved
• SOAP — Simple Object Access Protocol
• EFS — Encrypting File System
• EMC — Electromagnetic Compatibility
• LEN — Line Equipment Number
• ROSAT — Roentgen Satellite
• AMHS — Automated Message Handling System
• ECP — Encryption Control Protocol
• CIS — CompuServe Information Service
• DID — direct inward dial
• TNX — Thanks
• DEC — Decimal
• RSRQ — Reference Signal Received Quality
• ASIC — application-specific integration circuit
• AIN — Advanced Intelligent Network
• MOD — Modify
• SHF — Super High Frequency
• BG — Background
• DC — Display Controller
• DTI — Department of Trade and Industry (UK)
• EDP — Electronic Data Processing Plc (London Stock Exchange [LSE])
• ETS — European Telecommunication Standard
• METRO — Metropolitan
• PBX — Private Branch eXchange (company phone system)
• PDS — Planetary Data System
• NNM — Network Node Manager
• CB — Common Battery
• 10BASE-T — 10 Megabits per second, Baseband, Twisted pair

• AAS — Adaptive Antenna System
• MCA — Micro Channel Architecture
• FCC — Federal Communications Commission (US)
• Y — Yes
• TLC — The Learning Channel
• TSR — Telecommunications Service Request
• TCSEC — Trusted Computer System Evaluation Criteria
• DC — Disconnected
• MCD — Magnetic Circular Dichroism
• BERT — Bit Error Rate Tester (telecommunication)
• TO — Technical Order
• CU — Channel Unit
• VC — Virtual Channel
• SF — Single Frequency
• ADCCP — Advanced Data Communications Control Procedures
• DCN — Disconnect
• FAA — Federal Aviation Agency
• DX — Duplex
• TE — Test Equipment
• SL — Single Line
• EIP — Equipment installation procedure
• ASARS — Advanced Synthetic Aperture Radar System
• RT — Radiotelephone
• NRC — National Research Council (Canada)
• MDF — Main Distribution Frame
• FDL — Facility Data Link
• OTS — Optical Transmission Section
• DCN — Design Change Notification
• EDD — Envelope Delay Distortion
• HVAC — Heating, Ventilation, and Air Conditioning
• VT — Vacuum Tube
• PABX — private automatic branch exchange (telephone)
• CRC — Contrôle de Redondance Cyclique (French: Cyclic Redundancy Check)
• LEP — Large Electron Positron
• CER — Cell Error Ratio
• TCO — Total Cost of Ownership
• RT — Response Time
• CBP — Coded Block Pattern
• CFO — Communication Filing Officer
• KHZ — kilohertz (1000 cycles per second)
• BRI — Basic Rate Interface
• AS — Access System
• CS — Convergence Sublayer (ATM)
• C³CM — Command, Control and Communications Countermeasures
• RARP — Reverse Address Resolution Protocol
• SAE — Society of Automotive Engineers
• CST — Central Standard Time (UTC-6 Hours)
• DUC — Digital Up-Converter
• WWAN — Wireless Wide Area Network
• FTTB — Fiber To The Building

• ARG — Argument
• APM — Advanced Power Management
• UTC — Coordinated Universal Time
• MIPS — Millions of Instructions Per Second
• AAF — Advanced Authoring Format
• EX — Exercise
• PTA — Pakistan Telecommunication Authority
• BTC — Botswana Telecommunications Corporation
• FCA — Free Carrier Absorption
• SML/SMS — Service Management Layer/Service Management Service
• PS — Product Specification
• BPDU — Bridge Protocol Data Unit
• YL — Young Lady
• DSN — Deep Space Network - network of large antennas and communication facilities.
• EMR — Electromagnetic Radiation
• SLP — Service Location Protocol
• PE — Probable Error
• OSTP — Office of Science and Technology Policy
• NNTP — Network News Transfer Protocol
• JVM — Java Virtual Machine
• DL — Digital Library
• CMT — Cadmium Mercury Telluride
• OAM&P — Operations, Administration, Maintenance & Provisioning
• NTIS — National Technical Information Service Technology Administration
• A — Anode
• PVC — Permanent Virtual Circuit (ATM)
• OC-9 — Optical Carrier Signal, Level 9
• ASI — Asynchronous Serial Interface
• CCTA — Central Computer and Telecommunications Agency
• BS — Broadcast Satellite
• HDML — Handheld Device Markup Language
• ESTEC — European Space Research and Technology Centre
• NEMA — National Electric Manufacturer's Association
• SAS — Special Access Surcharge
• FASB — Financial Accounting Standards Board
• LDAP — Lightweight Directory Access Protocol (pronounced Ell-dap)
• TI — Time Interval
• OLE — Object Linking and Embedding (Microsoft communication protocol)
• FE — Finite Element
• LLU — Local Loop Unbundling
• IT — Integration Test
• FR PVC — Frame Relay Permanent Virtual Connection
• AVL — Available
• CAM — Content Addressable Memory
• LU — Logical Unit
• SAR — Specific Absorption Rate
• AUD — Audit
• DCS — Digital Cross-Connect
• ISSN — International Standard Serial Number (ISO 3297)
• CO — Central Office

• TCM — Trellis-Coded Modulation
• ACT — Activity
• PIC — Peripheral Interface Controller
• E — Echo
• CDC — Connected Device Configuration
• BSS — Basic Service Set
• TE — Terminal Equipment
• DSP — Digital Signal Processor
• QPSK — aeronautical quadrature phase shift keying
• C4 — Command, Control, Communications, and Computers
• DSLAM — Digital Subscriber Line Access Multiplexer (Module)
• UP — User Profile
• 9 — Nine
• FTTH — Fiber To The Home
• RJ-25 — Registered Jack type 25 (6-wire connector)
• ADL — Advanced Distributed Learning
• UI — User Interface
• NBS — National Bureau of Standards (US)
• LQR — Linear Quadratic Regulator
• OC-18 — Optical Carrier Signal, Level 18
• ECPA — Electronic Communications Privacy Act 1986
• OC-256 — Optical Carrier Signal, Level 256
• VOIP — Voice Over IP (Internet Protocol)
• PDC — Personal Digital Cellular
• BIOS — Basic Input Output System
• Q — Quadrature
• DCS — Digital Cellular System
• IANA — Internet Assigned Numbers Authority
• ITP — Interactive Telecommunications Program
• CGM — Computer Graphics Metafile
• MIB — Management Information Base (ATM)
• LT — Less Than
• ARINC — Aeronautical Radio Incorporated
• NIC — Network Interface Controller
• PCM — Pulse-Code Modulation
• RSN — Real Soon Now [which may be a long time coming]
• CFA — Carrier Facility Assignment
• PM — post meridian
• IV — Initialization Vector
• SATAN — Security Administrator Tool for Analyzing Networks
• PKI — Public Key Infrastructure (cryptography)
• EPR — Ethylene-Propylene Rubber
• ADT — Atlantic Daylight Time (UTC-3 Hours)
• SIM — Subscriber Identity Module
• APS — Automatic Protection Switching (SONET/SDH)
• CAPS — Call Attempts Per Second
• SD — Software Development
• MME — Mobility Management Entity
• SML — Service Management Layer
• 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

• JAN — Joint Army-Navy
• MAI — Multiple Access Interference
• SBU — Strategic Business Units
• RTU — Remote Terminal Unit
• ECMA — European Computer Manufacturer's Association
• ARIN — American Registry for Internet Numbers
• ISAS — Institute of Space and Astronautical Sciences (Japan)
• ISBN — International Standard Book Number (ISO 2108)
• BSS — Base Station Subsystem
• MMU — Memory Management Unit
• BIU — Bus Interface Unit
• MTU — Maximum Transmission Unit
• CORBA — Common Object Request Broker Architecture
• DID — data item description
• BOD — Bandwidth on Demand
• SVP — Senior Vice President
• B2C — Business-to-Consumer
• OSHA — Occupational Safety and Health Act (1970)
• SHA — Secure Hash Algorithm
• NA — Network Adapter
• VT — Virtual Terminal
• PMP — Project Management Professional
• DTMF — Dual-Tone MultiFrequency
• CIFS — Common Internet File System
• EMEA — Europe, Middle East and Africa
• ACF — Access Control Field
• DRM — Digital Rights Management
• EEA — European Economic Area
• SPM — Scanning Probe Microscope
• PM — Project Manager
• SRS — Software Requirements Specifications
• TSB — Telecommunication Standardization Bureau
• SPGA — Staggered Pin Grid Array
• NPA — Numbering Plan Area
• AFM — Atomic Force Microscopy
• EFIS — Electronic Flight Information System
• SA — Source Address
• UN — United Narions
• TCR — Temperature Coefficient of Resistance
• ACLR — Adjacent Channel Leakage Ratio
• VOA — Voice Of America
• PAP — Password Authentication Protocol (ATM)
• ATC — Advanced Technology Center
• PG — Page
• PC — Peripheral Controller
• EAI — Enterprise Application Integration
• CMD — Command
• PVD — Physical Vapor Deposition
• MV — Motion Vector
• FSK — Frequency-Shift Keying

• ANI — Automatic Number Identification (Caller ID)
• SCADA — Supervisory Control And Data Aquisition
• AYT — Are You There
• TLK — Talk
• WTLS — Wireless Transport Layer Security
• ACE — Adaptive Communication Environment
• MX — Mixer
• CCSD — command communications service designator; control communications service designator
• ABN — Abnormal
• SZ — Seizure
• TOS — Temporarily Out of Service
• BAN — Base Area Network
• CMP — Connection Management Protocol
• DPL — Digital Power Line
• FRS — Family Radio Service
• FRS — Frame Relay Service
• NIST — National Institute of Standards & Technology (US)
• STA — State
• JPEG — Joint Photographic Experts Group (24-bit image storage format)
• ISM — Industrial, Scientific and Medical
• C — Cost
• SB — Switchboard
• EECM — End-to-End Call Manager
• ACTV — Active
• YYP — Yahoo Yellow Pages
• CS-PDU — Convergence Sublayer - Protocol Data Unit
• CB — Citizens' Band
• BBM — Blackberry Messenger
• NOC — Network Operations Center
• TMS — Time Management System
• SIT — Static Induction Transistor
• SOGA — Share of Gross Adds
• B3G — Beyond Third Generation
• FEP — Front End Processor
• WLAN — Wireless Local Area Network
• NCSC — National Computer Security Center (NSA)
• CPC — Continous Packet Compression
• AWG — American Wire Gauge
• 100BASE-T4 — 100 Megabits per Second, Baseband, Four-pair Category 3 UTP cables
• EM — Electromigration
• BS — Backing Store
• RDF — Radio Direction Finder
• CDA — Command and Data Acquisition
• PDT — Portable Data Terminal
• DDL — Digital Data Link
• RP — Reference Point
• SRM — Scalable Reliable Multicast
• OSCAR — Orbiting Satellite Carrying Amateur Radio
• CGA — Carrier Group Alarm
• NTP — Network Time Protocol

• B2B — Business to Businesse
• CBWFQ — Class Based Weighted Fair Queueing
• BUS — Business
• MIDP — Mobile Information Device Profile
• D-RAM — Dynamic Random Access Memory
• SMR — Specialized Mobile Radio
• SDLC — Synchronous Data Link Control
• RSVP — Resource Reservation Protocol (Internet)
• TTY — Teletype Telex Machine
• IP — Intellectual Property
• HTML — Hyper Text Markup Language
• POTS — Plain Old Telephone Service (FCW)
• SIL — Silence
• VGA — Video Graphics Array
• FAX — Facsimile
• CTU — Central Terminal Unit
• MIT — Massachusetts Institute of Technology (U.S.)
• APPL — Application
• CGSA — Cellular Geographic Service Area
• TAD — Telephone Answering Device
• FAS — Frame Alignment Signal
• SPX — Sequenced Packet Exchange
• BCH — Binary Coded Hexadecimal
• NES — Network Encryption System
• ARQ — Automatic Repeat-reQuest
• WPM — speech--words per minute
• ROTFL — Roll On The Floor Laughing
• DS-0 — Digital Signal, Level 0
• SLV — Satellite-Launch Vehicle
• VG — Voice Grade
• COM — Comedy Central
• CD — Critical Dimension
• TOA — Time Of Arrival
• COPS — Common Open Policy Service
• PST — Pacific Standard Time (UTC-8 Hours)
• SCM — Supply Chain Management
• EFT — Electronic Funds Transfer
• WIPO — World Intellectual Property Organization
• E&M — ear and mouth (special signaling leads)
• CQA — Certified Quality Auditor
• ASDE — Airport Surface Detection Equipment
• ELT — Emergency Locator Transmitter
• PU — Physical Unit (IBM)
• S/D — Source/Drain
• SW — South West
• TDOA — Time Difference Of Arrival
• EISA — Extended Industry Standard Architecture
• TAG — Technical Advisory Group for Biological Control Agents of Weeds
• SG — Signaling Gateway (IETF)
• CRO — Central Records Office

• DL — Data Link
• ODBC — Open Database Connectivity
• FEP — Front-End Processor
• DMI — Distributed Management Interface
• KAK — Key-Auto-Key
• MIME — Multipurpose Internet Mail Extension
• O/S — Operating System
• ES — Emergency Service
• 2W — 2-Wire
• KB — Kilobyte: One thousand and twenty-four bytes kbps kilo bit per second
• RSS — Really Simple Syndication
• ECM — Electronic Counter Measures
• TDM — Time Division Multiplexer
• AIFF — Audio Interchange File Format
• CAP — Capability
• LD — Laser Diode
• AC — Area Code
• 911 — Emergency Services Phone Number
• ER — Extended Range
• FLM — First Line Maintenance
• ESF — Edge Spread Function
• IRS — Inertial Reference System
• MDM — Mobile Device Management
• HEHO — Head End Hop Off
• SPA — Software Publishers Association
• CHF — Swiss Franc
• HSS — Home Subscriber Server
• CAD — Computer-Aided Design
• PM — Phase Modulation
• TSE — Toronto Stock Exchange
• WE — Western Electric
• PDN — Packet Data Network
• PSS — Performance Support System
• SDK — Software Development Kit (Microsoft)
• BA — Behaviour Aggregate
• ETF — Early Termination Fee
• SUS — Suspension
• SQ — Service Quality
• 100BASE-T — 100 Megabits per second, Baseband, Twisted pair
• PPARC — Particle Physics and Astronomy Research Council
• USGS — United States Geological Survey (DOI)
• ECP — Engineering Change Proposals
• DPL — Digital Private-Line
• SLIC — Subscriber Line Interface Circuit
• SN — Stock Number
• DII — Dynamic Invocation Interface
• NSS — Network Switching Subsystem
• PIM — Personal Information Manager
• EMS — Express Mail Service
• P — Priority

• TAM — Telephone Answering Machine
• EHF — Extremely High Frequency
• MH — Message Handler
• CSC — Common Signaling Channel
• STD — Subscriber Trunk Dialing
• SPIN — Service Provider Identification Number
• CES — Consumer Electronics Show
• DAP — Distributed Array Processor
• DNIC — Data Network Identification Code
• ESP — Encapsulating Security Payload
• AIT — Automatic Identification Technology
• WDN — Wireless Developer Network
• EDT — Eastern Daylight Time
• WPAN — Wireless Personal Area Network
• CPN — Cisco Powered Network
• IOC — Inter-Office Channel
• SN — Service Number
• BJT — Bipolar Junction Transistor
• SD — Speed Dial
• CG — Center of Gravity (DXS)
• RMS — root mean square (preferred over "RMS")
• E — Electra
• T&C — Terms & Conditions
• MLP — Mobile Location Protocol
• CFD — Call For Discussion
• SSRC — Synchronization Source
• AP — Action Point
• B6ZS — Bipolar 6 Zero Substitution
• IEC — Interexchange Carrier
• SDH — Synchronous Digital Hierarchy (ATM)
• CSO — Customer Service Operations
• FAT — File Allocation Table
• 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)
• GMRS — General Mobile Radio Service
• CRIS — Carrier Route Information System
• CCD — Charge Coupled Device - a device for the movement of electrical charge.
• IPS — InPlane Switching
• PVC — Permanent Virtual Connection
• FEC — Forward Error Correction
• TOVS — TIROS Operational Vertical Sounder
• AN — Access Node
• CP — Call Processing
• CI — Common Interface
• EIGRP — Enhanced Interior Gateway Routing Protocol
• CT — Computer Terminal
• FXS — Foreign Exchange Subscriber
• CBR — Constant Bit Rate
• ICANN — Internet Corporation for Assigned Names and Numbers
• SDU — Signal Distribution Unit
• TAX — Trunk Automatic Exchange

• IMP — Interface Message Processor
• OFC — Office
• CFD — computational fluid dynamics
• DPDU — Data Protocol Data Unit
• BIS — Business Information System
• LMS — Learning management system
• IRS — Interface Requirements Specification
• TTY — Text Teletype
• CS — Central Station
• CSPDN — Circuit Switched Public Data Network
• DER — Distinguished Encoding Rules
• TELECOMMUTE — Telecommuting
• CIS — Computer and Information Science
• ECE — Economische Commissie voor Europa (United Nations) (Dutch: Economic Commission for Europe)
• EGP — Exterior Gateway Protocol
• EMCON — Electromagnetic Emission Control
• WAP — Wireless Application Protocol
• EU — End User
• CGA — Color Graphics Adapter
• PROM — Programmable Read-Only Memory
• OTDOA — Observed Time Difference of Arrival
• FWA — Fixed Wireless Access
• RTC — Real-Time Control
• FITL — Fiber-In-The-Loop
• RDS — Rate Determining Step
• CE — Channel Element
• OSP — Outside Plant
• CIP — Carrier Identification Parameter
• CVR — Crystal Video Receiver
• ACP — Access Control Point
• ADC — Administration Center
• XPS — X-Ray Photoelectron Spectroscopy
• BOFH — Bastard Operator From Hell
• SCU — System Control Unit
• BSS — Base Station System
• MGMT — Management
• DTD — Document Type Definition (XML)
• ACPI — Advanced Configuration and Power Interface
• LASA — Large Aperture Seismic Array
• SM — Service Module
• TUR — Trunk Utilization Report
• MA — Maintenance Action
• HDSL — High-bit-rate Digital Subscriber Line
• WMO — World Meteorological Organization (ICSU)
• BMEWS — Ballistic Missile Early Warning System (bee-mews)
• JCL — Job Control Language
• VSAT — Very Small Aperture Terminal (satellite service)
• ACAP — Application Configuration Access Protocol
• PCI — Personal Computer Interface
• KM — Knowledge Management

• ISOC — Internet Society
• DM — Domain Model
• VMS — Virtual Memory System
• IRC — International Record Carrier
• WINS — Windows Internet Name Service
• FDTD — Finite Difference Time Domain
• RAN — Radio Access Network
• EC — European Community
• ADN — Abbreviated Dialing Number
• C — Collector
• BMS — Business Management System
• ECR — Electronic Cash Register
• RMI — Remote Method Invocation
• UPS — Uninterruptible Power Supply
• SPC — Statistical Process Control. Forerunning quality theory from the 1960s to TQC and TQM.
• MPEG — Motion Picture Experts Group
• JST — Japan Standard Time
• COMDEX — Computer Dealers Exposition
• ROS — Return on Sales
• ORB — Object Request Broker
• AWT — Agence Wallonne des Télécommunications
• DDD — Direct Distance Dialing
• AIF — Audio Interchange Format
• WHT — Walsh-Hadamard Transform
• FOSE — Federal Office Systems Exposition
• NAFTA — North American Free Trade Agreement
• IAT — Integrated Access Terminal
• DC — Device Control
• DAT — Digital Audio Tape
• GHZ — Gigahertz
• ISAKMP — Internet Security Association and Key Management Protocol
• SIA — Securities Industry Association
• SSM — Synchronization Status Message
• GDM — GSM (Global System for Mobile communications) Data Module
• DCE — Data Communication Equipment
• 2W — Two Wire
• QDR — Quad Data Rate
• DTN — Data Transfer Network
• CP — Change Proposal
• CAM — Common Access Method
• IEEE — Institute of Electrical and Electronics Engineers
• BSA — Business Software Alliance
• LNP — Local Number Portability
• V — Variable
• COO — Cell of Origin
• RDI — Remote Defect Indicator (UNI Fault Management)
• SWAP — Shared Wireless Access Protocol
• DDN — U.S. Defense Data Network
• TRS — Telecommunications Relay Service
• FH — Frequency Hopping

• DNS — Domain Name Service
• WAYP — White and Yellow Pages
• T — Temperature
• AP — access point
• JRE — Java Runtime Environment
• TKIP — Temporal Key Integrity Protocol
• MTS — Message Transfer System
• WAIS — Wide Area Information Server
• SAR — synthetic aperture radar (satellite)
• VOC — Volatile Organic Compounds (air pollution)
• ASQ — Alpha System Qualification
• SRR — Search and Rescue Region
• ADT — American District Telegraph Company
• B-ISDN — Broadband Integrated Services Digital Network
• WTO — World Trade Organisation
• ADF — automatic document feeder
• ASD — Alternative Service Delivery
• TSO — Telecommunications Service Order
• DMS — Data Management System
• MBPS — Megabits per second
• OSS — Operations Support System
• JTF — Joint Task Force
• CPS — characters per second
• AFOSR — Air Force Office Of Scientific Research(USA)
• DGPT — Directorate General of Posts and Telecommunications
• HEX — Hexadecimal (base 16)
• PCMCIA — Personal Computer Memory Card International Association
• EIA — Extended Interaction Amplifier
• LOO — Likelihood of Occurrence
• ASA — Acoustical Society of America
• AWACS — Airborne Warning And Control System
• 1FB — Single line, Flat Business rate;
• SSM — Spread Spectrum Modulation
• CONUS — Contiguous United States
• NRPB — National Radiological Protection Board
• IMSI — International Mobile Subscriber Identity
• ALT — Accelerated Life Test
• KDC — Kerberos Key Distribution Center
• EDC — Electronic Dispersion Compensator
• FTTC — Fiber To The Curb光纤到路边
• MBWA — Mobile Broadband Wireless Access
• TDMA — Time Division Multiple Access
• RADIUS — Remote Authentication Dial-In User Service
• OTA — Office of Technology Assessment (U.S.; abolished by Congress, Fall 1995)
• IMEI — International Mobile Equipment Identity
• CDE — Common Desktop Environment
• COT — Central Office Terminal
• CFV — Call For Vote(s)
• FEXT — Far-End Cross Talk
• BCH — Bose-Chaudhuri-Hocquenghem Coding

• MPI — Minimum Picture Interval
• AOL — America on line
• LEC — Local Exchange Carrier
• VPI — Virtual Path Identifier
• DCA — Dynamic Channel Assignment
• LISP — List Processing Language
• WAR — Weekly Activity Report
• SAF — System Access Fee
• DVB — Digital Video Broadcasting
• PP — Polypropylene
• LATA — Local Access and Transport Area
• DUA — Directory User Agent
• VF — Voice Frequency
• TFTP — Trivial File Transfer Protocol (ATM)
• IMC — Intermediate Metal Conduit
• DHD — Dial Home Device
• IPM — Inches Per Minute
• DN — Distinguished Name
• ADB — Apple Desktop Bus
• PMT — Program Management Team
• SIL — Solid Immersion Lens
• ALB — Analog Loopback
• HFC — Hybrid Fiber/Coaxial network
• DSN — Defense Switched Network
• CMRS — Commercial Mobile Radio Service
• 3GPP — Third Generation Partnership Project
• NF — Noise Factor
• BOSS — Binary Object Storage System
• CAL — Calorie
• AAV — Accountholder Authentication Value
• DII — Defense Information Infrastructure
• ET — Electronic Transmission
• CRTS — Cellular Radio Telecommunications Service
• NCP — Network Control Protocol
• ACC — Area Control Center
• HLR — Home Location Register
• TDD — Time Division Duplex
• DDU — Disk Drive Unit
• COAX — Coaxial
• NIU — Network Interface Unit
• TCIC — Trunk Circuit Identification Code
• NCSA — National Center for Supercomputing Applications
• DSS — Digital Signature Standard
• NDVI — Normalized Difference Vegetation Index
• OML — Object Model Library
• RCC — Radio Common Carrier
• 3-D — 3-Dimensional
• LANE — Local Area Network Emulation
• ST — Such That
• DEMUX — Demultiplexer

• CND — Calling Number Display
• ILEC — Incumbent Local Exchange Carrier
• REPT — Report
• AOS — Alternate Operator Service
• DPSK — Differential Phase Shift Keying
• RNX — Restricted Numeric eXchange
• IRDA — Infrared Data Association
• SNA — System Network Architecture
• DDI — Direct Dialing Incoming
• DTI — Digital Trunk Interface
• LS — Loop Start
• TL1 — Transaction Language 1
• MC — Maintenance Control
• IRTF — Internet Research Task Force
• MLM — Multi-Longitudinal Mode
• IRQ — Interrupt Request
• JDK — Java Development Kit
• PAM — Payload Assist Module
• INSAT — Indian National Satellite
• GI — Graded-Index
• RSL — Restricted Service License
• QI — Quality Indicator
• BLOS — Beyond Line-Of-Sight
• EMR — Electromechanical Relay
• DCS — Data Collection System (NOAA Polar Orbiting Satellites)
• DSI — Digital Speech Interpolation
• DTAP — Direct Transfer Application Process
• DVMRP — Distance Vector Multicast Routing Protocol
• AVR — Automated Voice Response
• ILD — International Long Distance
• VLSI — Very-Large-Scale Integration
• 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
• BER — Basic Encoding Rules (ASN.1)
• MA — Message Analysis
• IPS — Instructions Per Second
• FOD — Fax on Demand
• CDM — Conceptual Data Model
• CMIP — Common Management Information Protocol (ATM)
• CRLF — Carriage-Return Line-Feed
• RAU — Remote Access Unit
• ALOC — Average Length Of Call
• L2TPV3 — Layer 2 Tunneling Protocol Version 3
• MP — Modulation Parameter
• DL — Definition List
• COMINT — Communications Intelligence
• EA — Extended Address Field Bit
• DCMI — Dublin Core Metadata Initiative (Online Computer Library Center)
• GBT — Ground Based Tower
• FGA — Feature Group A
• PACS — Personal Access Communications System

• RXQUAL — Received Signal Quality
• MSW — Most Significant Word
• FGD — Feature Group D
• APDU — Application Protocol Data Units
• PEM — Privacy-Enhanced Mail
• ABM — Asynchronous Balanced Mode
• AMPS — Advanced Mobile Phone Service (cellular phone standard)
• FAC — Forced Authorization Code
• FDI — Feeder Distribution Interface
• SCPC — single channel per carrier
• ASEAN — Association of South East Asian Nations
• ACA — Adaptive Channel Allocation
• IAD — Integrated Access Device
• OT — Office of Telecommunications
• CRV — Call Reference Value
• VTS — Vessel Traffic Service
• EOB — End Of Business
• ICL — Inserted Connection Loss
• AMSS — Automatic Message Switching System
• CBEMA — Computer & Business Equipment Manufacturers Association
• LIF — Logical Interchange Format
• NAT — Network Address Translation
• LRC — Longitudinal Redundancy Check
• VBR — Variable Bit Rate (ATM)
• LDN — Local Directory Number
• ADC — Access Deficit Charge
• CIP — Channel Interface Processor
• BLER — Block Error Rate
• UDP — Up Down Pair
• 2G — Second Generation Wireless Systems
• FCA — Fixed Channel Allocation
• RRN — Routing Recording Number
• 3G — 3rd Generation Wireless Format
• DM — Differential Mode
• IG — Interface Group
• VPA — Valid Peripheral Address
• BSI — British Standards Institution
• CLDC — Connected Limited Device Configuration
• 4GL — Fourth-Generation Language
• CRB — Cramer-Rao Bound
• NAK — Negative Acknowledge
• BAN — Building Area Network
• CMA — Communications Management Association
• OOP — Object-Oriented Programming
• EST — Establish
• CCCH — Common Control Channel
• LSW — Least Significant Word
• RJE — Remote Job Entry
• TCB — Telecommunication Certification Body
• RCS — Radar Cross Section

• IAB — Internet Architecture Board
• CNG — Fax Calling Tone
• TC — Transmission Convergence (ATM)
• CPC — Calling Party Control
• SDM — Service Delivery Management
• ACT — ACTIVITY, ACTIVITIES
• DPT — Dynamic Packet Transport
• SITA — Société Internationale de Télécommunications Aéronautiques
• SDP — Software Development Plan
• TRS — Trunked Radio Systems
• UML — Unified Modeling Language (Object Management Group, OMG)
• BHCA — Busy Hour Call Attempt
• ACSE — Association Control Service Element
• SPD — Serial Presence Detect
• DLP — Data Link Processor
• DOT — Department of Telecommunications (India)
• SN — Switching Network
• YAHOO — You Are Hazy Over Oranges
• CIAC — Computer Incident Advisory Capability
• CIC — Carrier Identification Code
• CLK — Clock
• INE — Intelligent Network Element
• DDCMP — Digital Data Communications Message Protocol
• CODEC — Coder/decoder
• VLAN — Virtual Local Area Network
• AWG — arrayed waveguide grating
• NII — National Information Infrastructure (USA)
• HSCSD — High-Speed Circuit-Switched Data
• CAC — Connection Admission Control (Asynchronous Transfer Mode)
• EIR — Equipment Identity Register
• SMDS — Switched Multimegabit Data Service (ATM)
• LRC — Learning Resource Center
• WSDL — Web Services Description Language
• SLAM — Scanning Laser Acoustic Microscope
• POP — Post Office Protocol
• NC — Network Channel
• SISIR — Singapore Institute of Standards and Industrial Research
• CIRC — Cross-Interleaved Reed-Solomon Code
• NTDS — Naval Tactical Data System
• MR — Mobile Router
• SOS — Save Our Souls (Help!)
• CCP — Compression Control Protocol
• COC — Central Office Connection
• CLETS — California Law Enforcement Telecommunication System
• UMA — Unlicensed Mobile Access
• EBS — Electron Bombarded Silicon
• UART — Universal Asynchronous Receiver/Transmitter
• EULA — End User License Agreement (usually in reference to software)
• BOM — Bit-Oriented Message
• NCF — Network Control Facility

• VN — Virtual Network
• ALI — Automatic Location Information
• ARSR — Air Route Surveillance Radar
• RICK — Repeater Interface Communications Kit
• LCR — Least Cost Routing
• RMON — Remote Monitoring
• TT — Text-Telephone
• RPV — Remotely Piloted Vehicle
• DCAS — Downloadable Conditional Access System
• RAU — Radio Access Unit (Army)
• SIM — Subscriber Identification Module
• EVA — Electronic Video Agent
• ISI — Intersymbol Interference
• BIS — Brought Into Service
• CMOS — Complementary Metal Oxide Semiconductors
• BSC — Bi-Synchronous Communications
• ARM — Asynchronous Response Mode
• AMPS — Advanced Mobile Phone System
• RSS — Radio Service Software (Motorola)
• MCC — Mission Control Center (JSC)
• TEI — Terminal Endpoint Identifier
• SVC — Switched Virtual Circuit (ATM)
• ISG — Information Systems Group
• GAN — Global Area Network
• SMB — Server Message Block
• EBCDIC — Extended Binary-Coded Decimal Interchange Code
• AAS — advanced automation system (FAA)
• C3I — Command, Control, Communications & Intelligence
• TD — Transmit Data
• IR — International Roaming
• RMS — Resource Management System
• FMR — Follow Me Roaming
• RDT — Recall Dial Tone
• EEROM — Electronically Erasable Read-Only Memory
• OMF — Object Management Framework
• MHO — My Humble Opinion
• TXM — Transmission X-ray Microscope
• LPD — Low Probability of Detection
• CSPRM — Common Signaling Protocols Resource Module
• 4W — Four-Wire
• WVOIP — Wireless Voice over Internet Protocol
• FECN — Forward Explicit Congestion Notification (ATM)
• CHTML — Compact Hypertext Markup Language
• RSS — root-sum-square
• CCIR — International Radio Consultative Committee (French Acronym)
• BT — Burst Tolerance
• VAS — Value Added Services
• AF — Assured Forwarding
• WFA — Wait for Answer
• NFPA — National Fire Protection Association

• CV — Coding Violation
• HSPA — High Speed Packet Access
• TOMS — Total Ozone Mapping Spectrometer (satellite Instrument)
• APN — An Access Point Name
• FI — Format Identifier
• TEL — Telephone
• FC — Frame Control
• EBIC — Electron Beam Induced Current
• CPG — Converged Packet Gateway
• SSN — Switched Service Network
• ASAR — Advanced Synthetic Aperture Radar 
• SCR — Sustainable Cell Rate
• VBA — Visual BASIC for Applications
• 3GPP — Third-Generation Partnership Project
• USA — Underground Service Alert
• CID — Craft Interface Device
• ULL — Unbundled Local Loop
• VPWS — Virtual Private Wire Service
• TCA — Threshold Crossing Alert
• NOAO — National Optical Astronomy Observatories (Tucson, AZ)
• CACH — Call Appearance Call Handling
• ECM — Error Correction Model
• NAS — Network-Attached Storage
• SMS — Service Management System
• EDFA — Erbium-Doped Fiber Amplifier
• CALEA — Communications Assistance for Law Enforcement Act
• FNN — Full National Number
• PDL — Positioning Data Link
• DISN — Defense Information Systems Network
• SRL — Singing Return Loss
• VSAT — Very Small-Aperture Terminal
• TOP — technical/office protocol
• FDD — Frequency Division Duplex
• WTS — Wireless Telecommunications Symposium
• WARC — World Administrative Radio Conference
• ASN.1 — Abstract Syntax Notation One
• RGN — Region
• ASN.1 — Abstract Syntax Notation 1
• FTAM — File Transfer Access and Management
• CCR — Customer Controlled Reconfiguration (Sprint)
• DXC — Digital Cross Connect
• DOD — Direct Outward Dialing
• DPCM — differential pulse code modulation
• CRS — Cell Relay Service
• RDBMS — Relational Data Base Management System (Oracle)
• RACH — Random Access Channel
• EMS — Element Management System (ATM)
• NIMBY — Not In My Back Yard
• IRF — Impulse Response Function
• CFNRY — Call Forwarding on No Reply

• ATS — Abstract Test Suite
• RISC — Reduced Instruction Set Computing
• MGC — Multimedia Gateway Controller
• RCU — Radio Control Unit
• LB — Local Battery
• DARTS — Design Approach for Real-Time Systems
• DSCP — Differentiated Services Code Point
• VLSI — Very Large-Scale Integration
• CNG — comfort noise generation
• 4G — Fourth Generation Wireless Systems
• TIFF — Tag Image File Format
• SSMA — Spread-Spectrum Multiple Access
• IESG — Internet Engineering Steering Group
• UMTS — Universal Mobile Telecommunications Service
• OBC — Onboard Computer
• DIS — Draft International Standard
• TU — Transmission Unit
• AUI — Attachment Unit Interface
• CAMA — Centralized Automatic Message Accounting
• TACSAT — Tactical Satellite
• ATS — Automatic Transfer Switch
• ANC — Access Network Controller
• VCI — Virtual Channel Identifier
• SE — Southeast
• FTTK — Fibre To The Kerb
• FRAD — Frame Relay Access Device
• CTIA — Cellular Telecommunications Industry Association
• DACS — Digital Access Cross-connect System
• ESCON — Enterprise System Connection
• DNSIX — Defense Network Security Information Exchange
• CCNA — Cisco Certified Network Associated
• DPA — Distributed-Power Architecture
• CRBT — Caller Ring Back Tone
• ADM — Administration Building
• STP — standard temperature and pressure (0° and 1 atm)
• CC — Composite Clock (SONET)
• OSF — Open Software Foundation
• NRP — Network Resource Planning
• MF — Multiple Frequency
• BCDIC — Binary Coded Decimal Interchange Code
• INTELSAT — International Telecommunications Satellite
• PNP — Plug-and-Play
• PD — Pulse Duration
• LT — Line Termination
• MAJ — Major
• VHSIC — Very High-Speed Integrated Circuit
• LI — Length Indicator
• CON — Concentrator
• MMM — Mobile Media Mode
• IDF — Independent Distribution Frame

• ADP — Automatic Data Processor
• PUK — PIN (Personal Identification Number) Unlocking Key
• FMC — Fixed Mobile Convergence "Mobile UC or Unified Communications over Wireless"
• DCF — Distributed Coordination Function
• CSR — Customer Service Report
• VSAM — Virtual Storage Access Method
• NREN — National Research and Education Network
• BTAM — Basic Telecommunications Access Method
• CMC — Career Management Center
• 4WAI — Four-Wire Analog Interface
• FEA — Finite Element Analysis
• CAVE — Cellular Authentication and Voice Encryption Algorithm
• DIL — Direct Inward Line
• RCP — Right-Hand Circular Polarization
• VESA — Video Electronics Standards Association
• TLT — Test Loop Translator
• RP — Radio Port
• LH — Link Handler
• SWBD — Switchboard
• MPLS — Multi Protocol Label Switching
• VCC — Virtual Channel Connection (ATM)
• YABA — Yet Another Bloody Acronym
• PCCA — Portable Computer Communications Association
• POE — power over ethernetinjector
• 3G — Third Generation (mobile communication system)
• ERL — Echo Return Loss
• ABBR — Abbreviation
• VXML — Voice eXtensible Markup Language
• IPVX — Internet Protocol version X
• CIP — Continuous Improvement Program
• DFG — difference-frequency generation
• SIP — Session Initiation Protocol
• WAE — Wireless Application Environment
• SCR — System Change Request
• RX — Receive
• OMP — Open Management Platform
• OSA — Open System Architecture
• TDD — Telecommunications Device for the Deaf
• ACF — Advanced Communications Function (IBM)
• LIDB — Line Information DataBase
• MFC — Multi-Frequency Code
• CTI — Computer Telephony Integration
• IPCP — Internet Protocol Control Protocol
• 2G — Second generation cellular
• VDR — Voice Digitization Rate
• WDA — Wireless Digital Assistant
• SONET — Synchronous Optical Network
• DTU — Data Transfer Unit
• GS — Ground Start
• ETN — Electronic Tandem Network

• STMR — Sidetone Masking Rating (telecommunications)
• DRFM — Digital Radio-Frequency Memory
• ITT — Invitation To Tender
• EMI — Electro-Magnetic Interference
• CPAP — Customer Premises Access Profile
• RADIUS — Remote Authentication dial In User Service
• YA — Yet Another
• DA — deca
• MSDP — Multicast Source Discovery Protocol
• RQMT — Requirement
• DE — Discard Eligibility (ATM)
• TTYL — Type To You Later
• MCP — Microsoft Certified Professional
• TP — Termination Point
• VPX — Virtual Path Cross-Connect
• CPH — Call Party Handling
• VRML — Virtual Reality Modeling Language
• LAG — Link Aggregation Group
• CSU — Channel Service Unit
• CLCC — Ceramic Leaded Chip Carrier
• VR — Virtual Router
• RDMA — Remote Direct Memory Access
• GDK — GIMP (GNU Image Manipulation Program) Drawing Kit
• LCF — Location Confirm
• VOB — Versioned Object Base
• AAL5 — ATM (Asynchronous Transmission Mode) Adaptation Layer 5
• CLD — Cross-Layer Design
• DPDT — Double-Pole Double-Throw
• PARC — Palo Alto Research Center
• DTE — Digital Terminal Equipment
• NSAI — National Standards Authority of Ireland
• DRQ — Disengage Request
• F — Frequency
• KSU — Key Service Unit
• FSK — Frequency Shift Keying
• NDS — Novell Directory Services
• DPBX — Digital Private Branch Exchange
• OD — Outside Diameter
• EGSM — Extended Global System for Mobile Communications
• FDOA — Frequency Difference Of Arrival
• SCM — Single-Carrier Modulation
• EMF — Event Management Framework
• PSN — Packet Switched Network
• BELLCORE — Bell Communications Research, Inc.
• RFR — Radio Frequency Radiation
• FMS — Fixed Mobile Substitution
• PSDN — Public Switched Digital Network
• TCC — Transmission Control Code
• ADCCP — Advanced Data Communication Control Procedures
• LSI — Large Scale Integration -> VLSI

• ET — Exchange Terminal
• ASYNC — Asynchronous
• FOIP — Fax Over Internet Protocol
• AT — Attenuation
• ATS — Air Traffic Services
• STN — Station
• CTO — Commonwealth Telecommunications Organisation
• WSFL — Web Services Flow Language
• DTL — Defense Telephone Link
• TNI — Telephone Network Interface
• IMAP — Internet Mail Access Protocol
• SMI — Structure of Management Information
• TIA — Telecommunications Industry Association
• E — Echo Time Zone
• VOB — Voice Over Broadband
• LDP — Label Distribution Protocol
• CAPTAIN — Character And Pattern Telephone Access Information Network
• SAT — Satellite
• SSP — Security Service Provider
• CRBT — Color Ring Back Tone
• FSAI — Fiber Serving Area Interface
• VNS — Virtual Network System
• RLU — Remote Line Unit
• LIM — Line Isolation Monitor
• CPOP — Circuit Precedence Over Packet data
• NCC — Network Control Center (GSFC)
• ESCA — photoelectron spectroscopy for chemical analysis
• ADPC — Automatic Data Processing Center
• EM — Element Manager
• TBCD — Telephony Binary Coded Decimal
• PLL — Phase Locked Loop
• EFCI — Explicit Forward Congestion Indication (ATM)
• UAT — Universal Access Transceiver
• UPT — Universal Personal Telecommunications
• DQDB — Distributed Queue Dual Bus
• ARFA — Allied Radio Frequency Agency
• DAC — Digital-To-Analog Converter
• FPS — Framing Pattern Sequence
• QS — Quasi-Synchronous
• UCF — Unregistration Confirm
• BY — Busy
• CTE — Computer Telephony Engineer
• TSC — Test System Controller
• PET — positron emission tomography
• WIN — Wireless Intelligent Network
• IEEE-CS — Institute of Electrical and Electronics Engineers Computer Society
• WORM — Write-Once, Read-Many
• ESPN — Entertainment and Sports Programming Network
• CSIRO — Commonwealth Scientific and Industrial Research Organization
• B2B — Business-to-Business

• RDT — Remote Digital Terminal
• IPLC — International Private Leased Circuit
• LCP — Local Control Point
• ENV — Environment
• SSAP — Source Service Access Point
• 1-ESS — x-ESS series of Electronic Switching Systems
• PTP — Point To point Protocol
• LRM — Long Reach Multimode
• LIS — Lightning Imaging Sensor
• DISA — U.S. Defense Information Systems Agency
• AMA — automatic message accounting
• ADTM — Asynchronous Data Transfer Mode
• SS1 — Signalling System 1 (500/20 Hz tones)
• IBSS — Independent Basic Service Set
• MTD — Moving Target Detection
• SDSL — Symmetric Digital Subscriber Line
• 4WA — Four Wire Analog
• PJC — Pointer Justification Count
• CC — Country Code
• CCNA — Cisco Certified Network Administrator
• TP — Transition Point
• RIPE NCC — Reseaux IP Europeens Network Coordination Centre
• NE — North-East
• OMA — Open Mobile Alliance
• LBR — Low Bit Rate
• TCM — Time Compression Multiplexer
• DXF — Data Exchange Format
• FCA — Free Carrier Alongside
• SPA — Special Prorate Agreement
• X — X Window System
• USF — Universal Service Fund
• IWF — Interworking Function
• PTT — Push to Talk Technology
• ANSI-41 — ANSI standard for mobile management
• TCP/IP — Transmission Control/Internet Protocol
• CIS — Center for Integrated Systems
• CPE — Customer Premise Equipment
• ECS — Encryption Control Signal
• BP — Block Parity
• LLA — Link Level Access
• DAS — Data Acquisition System
• VTAM — Virtual Telecommunication Access Method
• WNMS — Wireless Network Management System
• SMPTE — Society of Motion Picture and Television Engineers, Inc.
• VSM — Vestigial Sideband Modulation
• SCCS — Switching Control Center System
• PBT — Polybutylene Terephthalate
• TBPS — Terabits Per Second
• DIV — Divisionsion
• VQV — Voice Quality Value

• NE — Network Element
• MMDS — Multichannel Multipoint Distribution Service
• CPS — Cycles Per Second (now Hertz)
• BASIZE — Buffer Allocation Size
• DOCSIS — Data over Cable Service Interface Specification
• MTA — Message Transfer Agents (Internet)
• CVD — Chemical Vapor Deposition
• SCC — Specialized Common Carrier
• CDV — Cell Delay Variation(ATM)
• DMT — Discrete Multi-Tone Technology
• MSRN — Mobile Station Roaming Number
• SKU — Stockkeeping Unit
• DSSSL — Document Style Semantics and Specification Language
• PDSO — Packet Data Security Overlay
• COFA — Change Of Frame Alignment
• EMS — Enhanced Messaging Service
• GBPS — Gigabits per second
• EDSX — Electronic Digital Signal Cross-Connect
• CT — Cordless Telecommunications
• LXT — Local Exchange Terminal
• TP — Telephone Pole
• OWS — Operator Work Station
• HTML — Hyper-Text Markup Language
• CSP — Converged Service Platform
• IEEE-SA — Institute of Electrical and Electronics Engineers - Standards Association
• BNC — Bayonet Neill-Concelman
• P&A — Privacy and Authentication
• CCA — Carrier-Controlled Approach
• ELFEXT — Equal-Level Far-End Cross-Talk
• TDWR — Terminal Doppler Weather Radar
• BUFR — Binary Universal Form for the Representation (of data)
• AMOLED — Active Matrix Organic Light-Emitting Diode
• FIOS — Fiber Optic Services
• DLCI — data link connection identifier
• FAT — Final Acceptance Testing
• ASTD — American Society of Training and Development (Alexandria, Virginia)
• CDVT — Cell Delay Variation Tolerance
• GERAN — GSM (Global System for Mobile communications) Edge Radio Access Network
• ATD — Advanced Technology Demonstration
• FTTP — Fiber To The Premises
• BIND — Berkeley Internet Name Domain
• RTC — Right to Carry
• NSAP — Network Service Access Point
• TCS — Telephony Control Specification
• MAP — Mobile Application Part
• DOD — Dial on Demand
• CICS — Customer Information Control System (IBM Mainframe Software; Kicks Or C-I-C-S)
• BSID — Base Station Identity
• LRQ — Location Request
• AAP — Alternate Access Provider

• BSA — Basic Service Area
• AAV — Alternate Access Vendor
• CBMS — Computer-Based Message System
• RECON — Reconnaissance
• CDM — Configuration Data Manager
• BAM — Basic Access Module
• ASE — Application Service Element
• NCAR — National Center for Atmospheric Research (US)
• 4 GIG — 4 Giga Intellectual Gadget
• PLCP — Physical Layer Convergence Procedure
• S/N — Signal-to-Noise ratio
• AAL — ATM (Asynchronous Transmission Mode) Adaptive Layer
• L2TP — Layer 2 Tunneling Protocol
• SPID — Service Profile Identifier
• ECS — Environmental Control System (Subsystem)
• IPRC — Intellectual Property Rights Committee
• STU — Secure Telephone Unit
• LCAS — Link Capacity Adjustment Scheme
• BDE — Borland Database Engine
• ACF — Access Coordination Function
• TSDU — Transport Service Data Unit
• PTT — Push to Talk Taster
• B8ZS — Binary Eight Zero Substitution
• CM — Connection Manager
• UBR — Unspecified Bit Rate
• SMSC — Short Message Service Center
• NMC — Network Management Center
• TPS — Telephone Preference Service
• RAD — Recorded Announcement Device
• PTP — Point to Point Transmission Service (electricity)
• CAR — committed access rate
• WSA — Wireless Security Auditor
• FR — Functional Requirement
• MGCP — Multimedia Gateway Control Protocol
• TTY — teletype terminal
• RRC — Root Raised-Cosine
• SCE — Service Creation Environment
• 3G HSPA — Third-Generation High-Speed Packet Access
• DDM — Data Distribution Manager
• SQL — Specified Quality Level
• TDRSS — Tracking and Data Relay Satellite System
• TLP — Transmission Level Point
• MPU — Main Processor Unit
• MFLOPS — Millions of Floating Point Operations per Second
• MIS — Management Information Service
• HPN — Home Phone Network
• TOC — Telecommunication Operations Center
• PLE — Path Length Efficiency
• CSCW — Computer-Supported Cooperative Work
• SETI — Search for Extraterrestrial Intelligence

• HSCSWD — High-Speed Circuit-SWitched Data
• SDNS — Secure Data Network System
• MITI — Ministry of International Trade and Industry
• AI — Adapter Interface
• DECCO — DISA Defense Commercial Communications Office
• CERN — Conseil Europeen Pour La Recherche Nucleaire
• ATU-C — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Central office end
• BDFB — Battery Distribution Feeder Bay
• IDCU — Integrated Digital Carrier Unit
• VSC — Vertical Service Code
• LP — Line Pair
• FMS — Fraud Management System
• AFPS — Automatic Facility Protection Switching
• VCA — Voice Connecting Arrangement
• CSR — Customer Service Request
• TRMM — Tropical Rainfall Measuring Mission (US-Japan)
• NT — New Technology, also Windows NT
• LSAP — Link Service Access Point
• DPST — Double-Pole Single-Throw
• BAF — Bellcore AMA (Automatic Message Accounting) Format
• GLT — Great Lakes Telecom
• TACACS — Terminal Access Controller Access Control System
• APPC — Advanced Program-to Program Communications
• IVP — Integrated Voice Protocol
• CDA — Communications Decency Act's
• SRA — Seamless Rate Adaptation
• WFG — Wireless Firewall Gateway
• DDSN — Digital Derived Services Network
• CPT — Cellular Paging Teleservice
• DDLD — Direct Dial Long Distance
• WTL — Wireless Transport Layer
• IDCP — Internet Device Control Protocol
• B-ISDN — Broadband ISDN
• COP — Character Oriented Protocol
• MTP — Message Transfer Part
• VISSR — visible and infrared spin scan radiometer (GOES)
• PIM — Protocol Independent Multicast
• D3 — Digital channel bank, Third generation
• AMTI — Airborne Moving Target Indicator
• ISO — Independent System Operator (US) (see also TSO) Responsible for grid management, but does not own assets. (electricity)
• CCCI — Command, Control, Communications and Intelligence
• PIC — Programmable Interrupt Controller
• DS-3 — Digital Signal, Level 3
• NCOS — Network Class Of Service
• MCR — Minimum Cell Rate (ATM)
• MAG — Mobile Access Gateway
• MMC — Microsoft Management Console (Microsoft)
• CDSL — Consumer Digital Subscriber Line
• 100VG — 100 Voice Grade (IEEE 802.12 AnyLAN Standard)
• DL — Downlink Message

• ALI — Automatic Location Identifier
• B-CPE — Broadband Customer Premises Equipment
• DCS — Defense Communications System
• BNCC — Base Network Control Center
• HDTV — High-Definition Television
• LVM — Line Verification Module
• CES — Circuit Emulation Service
• SPE — Synchronous Payload Envelope
• DXI — Data Exchange Interface
• TDM — Time Division Multiplexing
• DLL — Digital Local Line
• XWI — XML (extensible markup language) for Wireless Images
• DSCS — Defense Satellite Communication System
• BPSK — Binary Phase-shift Keying
• SDP — Session Description Protocol
• RADINT — Radar Intelligence
• LULT — Line Unit/Line Termination
• P2P — Person-to-Person
• CODASYL — COnference on DAta SYstems Languages
• LMS — Location and Monitoring Service
• HFC — Hybrid Fiber Coaxial
• LAAS — Local Area Augmentation System
• SCH — Synchronization Channel
• ESN — Electronic Serial Number
• WFA — Work Force Administration
• DICOM — Digital Imaging and Communications in Medicine
• PM — Processable Mode
• ACM — Address Complete Message
• FEAC — Far End Alarm and Control
• NCP — Network Control Program
• ANAC — An Automatic Number Announcement Circuit
• GMSS — Global Mobile Satellite System
• BT — Bluetooth Tablet
• UTL — Utility
• BPP — Billed Party Preference
• GSM — Groupe Speciale Mobile
• DAF — Directory Access Function
• BATM — Basic Telecommunication Access Method
• PY — person-year
• LCGN — Logical Channel Group Number
• MB — Measured Business
• DDU — Digital Data Unit
• DMS — Defense Messaging System
• DMT — Discrete Multi-Tone
• MTI — Moving Target Indicator
• TTL — ToS and Time-to-Live
• OSD — Onscreen Display
• SA — Selective Availability (on GPS transmissions)
• 3GIP — Third Generation Internet Protocol
• TED — Triteal Enterprise Desktop

• SR — Scanning Radiometer
• BSS — Broadband Switching System
• COAM — Customer Owned And Maintained
• DS0 — Digital Signal Zero
• CCITT — Comit? Consultatif International T?l?graphique et T?l?phonique
• WNAP — Wireless Network Access Point
• AMTFT — Active Matrix Thin Film Transistor
• VLF — Vertical-Laminar-Flow
• SMMR — Scanning Multichannel Microwave Radiometer
• UCM — Use Case Map
• PTT — Push to Talk Testing
• TRX — Tandem Repeater eXchange
• IDLC — Integrated Digital Loop Carrier
• ATB — Above-Ground Telecommunications Backbone
• TM — Thematic Mapper (Landsat)
• OXCO — Oven-Controlled Crystal Oscillator
• LFACS — Loop Facility Assignment and Control System
• DBRNC — deciBel Relative to Noise in a Circuit
• MLA — Modern Language Association
• SIGTRAN — Signaling Transport
• GFC — Generic Flow Control (ATM)
• IV&V — independent verification and validation
• CBQ — Class-Based Queuing
• LSC — Link State Control
• FEM — Finite Element Method
• FOC — Fiber-Optic Cable
• BCIX — Berlin Commercial Internet Exchange
• RQMTS — Requirements
• NFR — Near-Field Recording
• CSA — Canadian Standards Association (like UL)
• LSP — Label Switched Path
• WCDMA — Wideband Code Division Multiple Access
• VO — Voice Only
• RPCU — Radio Port Control Unit
• PSQM — Perceptual Speech Quality Measure
• SIO — Service Information Octet
• PCS — Personal Communications Services
• MUSIC — MUltiple SIgnal Classification
• URN — Uniform Resource Namespace
• CAN — Controller Area Network
• CSAR — Combat Search and Rescue
• NMS — NetWare Management System
• GSTN — General Switched Telephone Network
• DMT — Discrete Multi-tone Transmission
• CLP — Cell Loss Priority (ATM)
• FGDC — Federal Geographic Data Committee's
• SR — Slow Release
• CGI — Cell Global Identity
• ISC — International Switching Center
• FFH — Fast Frequency Hopping

• SAR — Segmentation and Reassembly (ATM)
• EV — electronvolt
• WK — Week
• ESA — Enhanced Subscriber Authentication
• STM — Synchronous Transfer Mode
• MMSI — Maritime Mobile Service Identity
• A/D — Analog-to-Digital converter
• ALCAP — Access Link Control Application Protocol
• TP — Transaction Processor
• CDA — Communications Decency Act of 1996
• BAOC — Barring of All Outgoing Calls supplementary service
• AECT — Association for Educational Communications and Technology's
• TRIG — Trigger
• EVC — Electronic Voucher Charging
• L2F — Layer 2 Forwarding protocol
• VCR — Videocassette Recorder
• ATCA — Advanced Telecom Computing Architecture
• GTB — Global Telecom Brokers
• DCC — Digital Control Channel
• SPT — System Page Table
• AMP — amplifier / amplification
• CLEC — Competitive Local Exchange Carrier
• CDDI — Copper Distributed Data Interface
• DCEF — Distributed Cisco Express Forwarding
• CNID — Calling Number Identification Display
• CCLC — Carrier Common Line Charge
• AB — Answer Back
• BC — Basic Call
• BIC — Bus Interface Controller
• CAM — Computer-Aided Manufacturing
• MTS — Message Transmission Subsystem
• IOC — Interoffice Channel
• EPP — Enhanced Parallel Port (PC)
• SAPI — Service Access Point Identifier
• BHCC — Busy Hour Call Completions
• SIMT — Système interbancaire marocain de télécompensation
• CGI — Computer Graphics Interface
• CAMEL — Customized Applications for Mobile-network Enhanced Logic
• EA — expedited acknowledgement
• DAC — Digital to Analog Converter-Audio
• CDV — Compressed Digital Video
• NLM — NetWare Loadable Module
• AMR — Automated meter reading also known as Automatic Meter Reading
• N-AMPS — Narrowband Advanced Mobile Phone System
• SINAD — SIgnal-to-(Noise And Distortion) ratio
• TSGR — Transport System Generic Requirements
• SS7 — Signaling System 7
• TSR — Terabit Switch/Router
• CMT — Commercial Metering Transponder
• SYM — Symmetric

• AFRINIC — African Network Information Centre
• SVI — Service Interception
• PLCP — Physical Layer Convergence Protocol (ATM)
• SPI — Security Parameters Index
• Z — Zulu Time
• NWK — Network
• AIS-L — Alarm Indication Signal - Line
• ULP — Upper Layer Protocol
• FIFO — first-in, first-out
• CVT — Circuit Validation Test
• NICT — National Institute of Information and Communications Technology
• MSI — Maritime Safety Information
• PSK — Phase Shift Key
• SFN — Single Frequency Network
• MAC — Message Authenticity Check
• IXC — interexchange carrier
• CLASS — Cell Level ATM (Asynchronous Transfer Mode) Services Simulator
• FPLMTS — Future Public Land Mobile Telecommunications System
• LMDS — Local Multipoint Distribution Service
• ROW — Rest Of World
• ODS — Operational Data Store (knowledge management)
• TDR — Time-Domain Reflectometry
• IPXCP — Internetwork Packet Exchange Control Protocol
• DCO — Dial Central Office
• MEH — Mobile-Executed Handoff
• DNI — Data Network Interface
• AEA — American Electronics Association's
• ACEK — Authentication Encryption Key
• DECT — Digital Enhanced Cordless Telecommunication
• NTU — Network Termination Unit
• NEMP — Nuclear Electromagnetic Pulse
• CSDU — Core Service Data Unit
• OIM — Operations Interface Module
• FRF-LMI — Frame Relay Forum - Local Management Interface
• CAAS — Communications-as-a-Service
• FD — Full Duplex
• WAR — Wireless Access Revolution
• PNP — Positive-Negative-Positive
• RJ-14 — Registered Jack type 14 (2-wire connector)
• UNI — User-Network Interface
• CS — Connection Segment
• W-CDMA — Wideband Code Division Multiple Access
• PMOS — P-channel Metal Oxide Semiconductor
• DFE — Design For Environment
• RBS — Robbed Bit Signaling
• DLT — Delete
• SEM — Scanning Electron Microscopes
• OOK — On/Off Keying
• CEE — Communaut? Economique Europ?enne
• RDI-L — Remote Defect Indicator - Loop

• CEPT — Conférence Européenne des Administrations des Postes et des Télécommunications
• VGF — Voice Grade Facility
• TELNET — Telecommunications Network Protocol
• FTS — Federal Telecommunications System
• PMMA — Polymethyl Methacrylate
• COBE — Corporate Owned Business Only
• ATRAC — Adaptive Transform Acoustic Coding
• MEECN — Minimum Essential Emergency Communication Network
• BT — Back Trace
• CU — Cooling Unit
• PSN — Public Switched Network
• AAS — Automatic Announcement Subsystem
• NARC — Non-Automatic Relay Center
• OCI — object code insertion
• VADB — Virtual Auto Dial Backup
• CCITT — Comite Consultatif International Telegraphique et Telephonique (now ITU-T)
• DNA — Do Not Answer
• BHP — Burst Header Packet
• DACS — Digital Access and Cross-Connect System
• BTP — Business Telecom Products, Inc.
• DEM — Digital Elevation Model
• CFOT — Certified Fiber-Optic Technician
• LN — Line
• CPN — Customer Premise Network
• SMU — Service Management Unit
• DUV — Data-Under-Voice
• LIU — Line Interface Unit
• ZBTSI — Zero Byte Time Slot Interchange
• SMS — System Management Server
• BSVCI — Broadcast Signaling Virtual Channel Identifier
• NW — North West
• WAW — Wide Area Wireless
• TSI — time-slot interchange
• QOI — Quality of Information
• DUV — Deep Ultraviolet
• UDT — Unreliable Data Transfer
• DNU — Do Not Use
• SES — Scientific and Engineering Software
• MDN — Mobile Directory Number
• HUMAN — High-speed Unlicensed Metropolitan Area Network
• ANSI — Advanced Network Signaling Input
• ADPCM — Adaptive Differential Pulse Code Modulation
• ECC — Emergency Communications Center
• MILNET — Military Network
• CCC — CDMA Cluster Controller
• RNR — Receive Not Ready
• TMSI — Temporary Mobile Subscriber Identity
• MBS — Maximum Burst Size (ATM)
• ECDIS — Electronic Chart Display Information System
• BAN — Billing Account Number

• ATIS — Automatic Transmitter Identification System
• OCC — Occupancy
• CCSA — Common Control Switching Arrangement
• LORAN — Long Range Aid to Navigation System
• ILETS — International Law Enforcement Telecommunications Seminar
• EIR — Excess Information Rate
• WWAN — wireless wide-area network
• UIH — Unnumbered Information with Header check
• FAW — Frame Alignment Word
• GRX — GPRS Roaming Exchange
• ISD — International Subscriber Dialling
• ANT — ADSL Network Terminator
• WCMP — Wireless Control Message Protocol
• RCT — remote Control Terminal
• DW — Deep Water
• PMT — Photo Multiplier Tube
• LOP-P — Loss Of Pointer - Path
• WTNM — Working Telephone Number Management
• AIU — Analog Interface Unit
• RADARSAT — Radar Satellite
• DPNSS — Digital Private Network Signaling System
• BSRF — Basic System Reference Frequency
• V — Vector
• ARD — Automatic Ring Down
• DTR — Down-Time Ratio
• CQ — Communications Quality
• SAM — Service Access Multiplexer
• AEIMP — Apple Event Interprocess Messaging Protocol
• 3GSM — Third-generation Global System for Mobile (communications)
• QEDI — Quod Erat Demonstrandum
• OC-1 — Optical Carrier Signal, Level 1
• TSD — Type Specific Driver
• FEBE — Far End Block Error (SONET)
• FLL — Fixed-Loss Loop
• MDCP — Media Device Control Protocol
• LQC — Line Quality Control
• NTSC — National Television Standards Committee
• TSC — Technical Standards Committee
• VFL — Visual Fault Locator
• CSI — Clearing Subnetwork Identification
• DLU — Digital Line Unit
• MMS — Multimedia Message Service
• ISSI — Inter-Switching System Interface
• TARP — Target Identifier Address Resolution Protocol
• ASAS — All-Source Analysis System
• OLS — Optical Line System
• DMT — Digital-Discrete Multi-Tone
• BB — Blackberry
• LMS — Local Measured Service
• VPC — Virtual Path Connection (ATM)

• AIS-V — Alarm Indication Signal - Virtual
• PSO — Professional Services Organization
• USF — Universal Server Farm
• CD — Committee Draft
• ZD — Zero Defects
• JDC — Japan Digital Cellular
• SLIC — Subscriber Loop Interface Circuit
• MOS — Metal Oxide Semiconductor (FET Devices)
• DSU — Digital Service Unit
• LSMS — Local Service Management System
• ATU-R — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Remote terminal end
• SDHLR — Super-Distributed Home Location Register
• * — Star, special function key
• CSP — Continuous Speech Processing
• APS — Advanced Power System
• QOD — Quality of Data
• WFT — Wireline Formation Test
• DLE — Digital Local Exchange
• ALT — Automatic Link Transfer
• VOFR — Voice Over Frame Relay
• OID — Object Interaction Diagram
• ADM 3X — DS3 Add-Drop Multiplex
• APR — Alarm Processing Remote
• SDN — Software Defined Network
• MSC — Mobile Switching Center
• DLT — Digital Line Termination
• INAP — Intelligent Network Application Part
• DNC — Do Not Call
• ITA — Illinois Telecommunications Association
• BCSM — Basic Call State Model
• PSLV — Polar Satellite Launch Vehicle (Indian Space Research Organization; India)
• DLC — Digital Leased Circuit
• RCMAC — Recent Change Memory Administration Center
• LRB — Loop Reverse Battery
• DMI — Desktop Management Interface (computing)
• LAPB — Link Access Protocol-Balanced
• SNIX — Single Noise Interference Xterminator
• ACU — Automatic Calling Unit
• CTTC — Centre Tecnològic de Telecomunicacions de Catalunya
• ADTS — Ameritech Digital Transport Service
• BDSL — Broadband Digital Subscriber Line
• LR-WPAN — Low-Rate Wireless Personal Area Network
• SRS — Supported Residential Services
• BABT — British Approvals Board for Telecommunications
• PHY — Physical Layer
• AAL2 — ATM (Asynchronous Transmission Mode) Adaptation Layer 2
• HDB3 — High-Density Bipolar Three-bit substitution
• AIS-P — Alarm Indication Signal - Path
• TTC — Telemetry Telecommand and Control
• CLF — Carrier Line Failure

• ACNA — Access Customer Name Abbreviation
• WSP — Wireless Service Provider
• NAP — Network Access Point
• ATSC — Advanced Television Systems Committee
• CCSS6 — Common Channel Signaling System # 6
• FOTS — Fiber Optical Transmission System
• BHCA — Busy Hour Call Attempts
• STA — Science and Technology Agency (Japan)
• TRLR — Trailer
• NRZ — Nonreturn To Zero
• APS — American Protective Services
• ACA — Automatic Circuit Assurance
• # — Number sign, octothorp; special function key
• ML-PPP — Multilink Point-to-Point Protocol
• AGCH — Access Grant Channel
• JISC — Japanese Industrial Standards Committee
• JSC — Joint Scientific Committee (ICSU, WCRP, and WMO)
• STM — Scanning Tunneling Microscopy
• RAI — remote alarm indication
• WBMP — Wireless Bitmap
• MBE — Molecular Beam Epitaxy
• BRAN — Broadband Radio Access Network
• WPKI — Wireless Public Key Infrastructure
• TACS — Total Access Cellular System
• IR — Information Request
• ARPT — Autorité de Régulation des Postes et Télécommunications
• IOS — Internet Over Satellite
• SDCCH — Standalone Dedicated Control Channel
• CCR — Current Cell Rate (ATMF)
• RADSL — Rate Adaptive Digital Subscriber Line
• MAU — Multistation Access Unit
• DSP — Data Service Provider
• LMT — Lightwave Microcell Transceiver
• IMTS — Improved Mobile Telephone Service
• UTP — Universal Transmission Protocol
• MP — Master Processor
• LFTYR — Ley Federal de Telecomunicaciones y Radiodifusión
• AUSPI — Association of Unified Telecom Service Providers of India
• EMV — EuroPay, MasterCard, Visa
• DACS — Digital Access Carrier System
• USPI — Universal Serial Phone Interface
• C² — Command and Control
• UMTS — Universal Mobile Telecommunication System
• FEBE-F — Far End Block Error count - Fast data
• MEID — Mobile Equipment Identifier
• VGC — Voice Grade Channel
• PRM — Performance Report Message
• E2E — End-to-End
• PCIA — Personal Communications Industry Association
• DORA — EV-DO (EVolution-Data Optimized) standard Revision A

• PTT — Post Telegraph and Telecommunications
• NSEP — National Security Emergency Preparedness
• PNE — Path Number Efficiency
• AS — Active Service
• SR — Service Request
• CLI — Calling Line Identification
• INWATS — INward Wide Area Telecommunications Service
• SGS — Software Generation System
• FECC-F — Forward Error Correction Count - Fast data
• MAPDU — Management Application Protocol Data Unit
• EC — Entropy Coding
• LSI — Large-Scale Integration
• TC — Technical Committee (HL7)
• MQFP — Metric Quad Flat Pack
• TOMS — Telecom Operations Management System
• ISP — International Signaling Point
• UMTS — Universal Mobile Telecommunications Standard
• ECTF — Enterprise Computer Telephony Forum
• MED — Manipulative Electronic Deception
• NMC — Network Model Coverage
• EDGE — Enhanced Data for GSM (Global System for Mobile communication) Evolution
• AL — Alignment
• CALA — Customer Address Location Area
• ATR — Advanced Telecommunications Research Institute
• DCA — Distributed Communications Architecture
• KEK — Key Encrypting Key
• CONS — Connection-oriented Network Services
• LDI — Long Distance Interconnect
• CSAA — Central Service Area Authority
• DF — Direction Finding or Finder
• LEED — Low-energy Electron Diffraction
• TCPA — Telephone Consumer Protection Act
• LRF — Laser Range Finder
• JMA — Japanese Meteorological Agency
• ICLD — Inter-Channel Level Difference
• PFE — Power Feed Equipment
• ESP — Essential Service Protection
• LUNT — Line Unit Network Termination
• DTW — Dynamic Time Warping
• RS-422 — Recommended Standard 422 (ANSI/EIA standard for transmitting serial data)
• M/W — MicroWave
• BSSMAP — Base Station System Management Application Part
• NSE — Network Software Environment
• BCS — British Computer Society
• AEE — Agent Execution Environment
• SCO — Synchronous Connection Oriented
• BPOP — Building Point of Presence
• CAIRO — Communications Audio Interface for Remote Operations
• DOITT — Department of Information Technology and Telecommunications
• DS-1 — Digital Signal, Level 1

• CIPOA — Classical Internet Protocol over ATM (Asynchronous Transfer Mode)
• DOV — Data-Over-Voice
• EADAS — Engineering and Administrative Data Acquisition System
• DCSS — Digital Cross-connect Systems
• HQGSM — High-Quality Global System for Mobile communications
• KTS — Key Telephone System
• ASP — Active Signaling Protocol
• RCF — Remote Call Forwarding
• CASE — Computer-Aided Software Engineering
• HTO — Hellenic Telecommunications Organisation
• VLR — Visitor Location Register
• RM-ODP — Reference Model for Open Distributed Processing
• CYTA — Cyprus Telecommunications Authority
• CALS — Computer Aided Acquisition and Logistic Support
• USRT — Universal Synchronous Receiver/Transmitter
• DORK — Disciples Of The Righteous King
• BTS — Base Transceiver Station (cellular)
• CMOS — Cellular Management Operation System
• SMT — station management (protocol)
• CLOS — Clear Line Of Sight
• RSN — Regional Service Network
• CF — Coin First Payphone
• GOMP — Get Off My Phone
• E-TDMA — Expanded Time Division Multiple Access
• RDSS — Radio Determination Satellite Service
• MCPC — Multiple Channels Per Carrier
• CACM — Communications of the ACM
• ADTS — Automated Digital Terminal System
• LTU — Line Termination Unit
• BFS — Broadcast File System
• GOS — Gerry Otis Simpson
• CL — cell loss
• CT — Control terminal
• TPF — Transmission Priority Field
• CCH — Common Channel Handler
• PTM — Point-To-Multipoint
• IPTD — Internet Protocol Telephony Design
• EST — Electroshock Therapy
• GTXC — Global Telephone Exchange Carrier
• ADIF — Accounting Data Interchange Format
• SNI — Service Node Interface
• CW — Call Waiting Supplementary Service
• RBT — Ring Back Tone
• WDMW — Web Directory for Mobile and Wireless
• GSM — Global System for Mobile telecommunications
• CEPT — Conference of European Posts and Telecommunications
• BTO — Betts Telecom Oklahoma
• WDF — Wireless Data Forum
• WAWS — Washington Area Wideband System
• PSC — Picture Start Code

• SFX — Special Effects
• TCL — Transverse Conversion Loss
• IBS — In-Building Solutions
• DCS — Digital Cross-connect Switch
• VGCP — Voice Grade Channel Processor
• OODBMS — Object-Oriented Database Management Systems
• PTO — U.S. Patent And Trademark Office
• RSI — Record Status Indicator
• NAM — Number Assignment Module
• AA — Auto-Answer
• DECT — Digital Enhance Cordless Telecommunications
• TR — Temporal Reference
• BUS — Broadcast and Unknown Server
• ETOC — Electronic Table of Contents
• FWS — Fixed Wireless Services
• RU — Release Unit
• SINS — Ship’s Inertial Navigation System
• NDIS — Network Driver Interface Specification (Microsoft Windows NT)
• SMG — Super Master Group
• MBMS — Multimedia Broadcast/Multicast Service
• DRTT — Dial Repeating Tie Trunk
• MIN — Mobile Identification Number
• TAE — Terminal Adapter Equipment
• SMDR — station message detail recording
• WPOP — Wireless Point-of-Presence
• IMPI — IP (Internet Protocol) Multimedia Private Identity
• RYP — Russian Yellow Pages
• NSN — National Significant Number
• CPS — Customer Premises System (Bellcore)
• TD-CDMA — Time Division - Code Division Multiple Access
• DMNG — Digital Mobile News Gathering
• ETSI — European Telecommunications Standard Institute
• DF — Distributing Frame
• IPCU — iPhone Configuration Utility
• NESC — National Electrical Safety Code
• TACSIM — Tactical Simulation (Simulator)
• DEO — Digital End Office
• DTU — Date/Time Update
• ACMA — Atlantic Cable Maintenance Agreement
• FELB — Far-End Loop Back
• DCB — Digital Channel Bank (Sprint)
• SHR — Self-Healing Ring
• CD-ROM — Compact Disk-Read-Only Memory
• GOSIP — Government Open System Interconnection Profile
• KSPS — KiloSymbols Per Second
• RLC — Radio Link Control
• CMAS — Cellular Management System
• BANC — Broadband Access Network Coordination
• COI — Community of Interest
• VCC — Voice Call Continuity

• FOE — Fiber Optic Equipment
• DPDCH — Dedicated Physical Data Channel
• LAT — Local Area Transport (network)
• LEC — Liquid Encapsulated Czochralski
• TWX — Teletypewriter Exchange (Telex)
• AVT — Audio Visual Telecommunications
• EF&I — Engineering, Furnishing and Installation
• PTM — Packet Transport Mode
• PAGCH — Paging and Access Grant Channel
• STDM — Statistical Time Division Multiplexing
• WEDE — Wireless Enterprise Delivery Environment
• DRTL — Dial Repeating Tie Line
• VRT — Voltage Reduction Technology
• ESG — Enhanced Service Gateway
• CITR — Canadian Institute for Telecommunications Research
• NMC — Nortel Matra Cellular
• SACS — Security Access Control System
• ICTA — Idaho Cable Telecommunications Association
• CAE — Common Application Environment
• IRAC — Interdepartment Radio Advisory Committee
• MVDS — Microwave Video Distribution System
• VAD — Voice Activity Detection
• BIOS — Basic Input-Output System
• CAL — Customer Access Line
• WCRL — Wireless Communications Research Laboratory
• NAM — Numeric Assignment Module
• D4 — Digital channel bank, Fourth generation
• FEBE-I — Far End Block Error count - Interleaved data
• SGCP — Simple Gateway Control Protocol
• BORSCHT — Battery feed, Overvoltage protection, Ringing, Signaling, Coding, Hybrid, and Testing
• WGX — Wireless Gateway Switch
• STE — Syrian Telecommunications Establishment
• 4G — Fourth Generation
• SLIP — Serial Line Internet Protocol
• NSDI — National Spatial Data Infrastructure
• JWP — Joint Working Party
• ADM — Administration, Office of
• SLC — Service Level Contract
• WUP — Wired Up Privacy
• MERIS — medium-resolution imaging spectrometer
• AH — Authentication Header
• RLS — Recursive Least Squares
• CDR — Common Data Rate
• ATMS — automatic transmission measuring system
• RSL — Request and Status Links
• PT — Payload Type (ATM)
• DBN — Dial-Back Number
• SYNC — Synchronization
• SCORM — Shareable Content Object Reference Model
• MOC — Maintenance and Operations Console

• RCR — Research and Development Center for Radio Systems
• E — Exchange
• ETSI — European Telecommunications Standards Institute
• M2M — Multipoint-to-Multipoint
• GOSIP — Government Open Systems Interconnection Profile
• DDSD — Delay Dial Start Dial
• SCC — Signal Conversion Circuit
• MRCA — Most Recent Common Ancestor
• F/W — Firmware
• EC — Echo Cancelling
• RFI — Remote File Inquiry
• ICI — Interexchange Carrier Interface
• CFNA — Call Forwarding No Answer
• IPC — Initial Paging Channel
• AFI — Authority and Format Identifier
• CAS — Column Address Strobe
• ARAI — Adjunct Route Application Interface
• OST — Office of Science and Technology
• DDS — Dataphone Digital Service (AT&T)
• MEAS — Measure
• IPR — Intellectual Property Right
• TFL — Telecom Fiji Limited
• BHA — Busy Hour Attempts
• SASL — Simple Authentication and Security Layer
• OC-96 — Optical Carrier Signal, Level 96
• BTL — Bell Telephone Laboratories, Inc.
• D/I — Drop and Insert
• AT — Access Terminal
• EGPRS — Enhanced General Packet Radio Service
• LSF — Line Spread Function
• LBX — Low Bandwidth X
• DMB — Disconnect and Make Busy
• CARS — Community Antenna Relay Service
• ASA — Avaya Site Administration
• DE — Discard Eligible
• TP-PMD — Twisted Pair Physical Medium Dependent
• CVSD — Continuous Variable Slope Detection
• VCT — Variable Cam Timing
• MM — Multimode (fiber optic cable)
• ILETS — Idaho Law Enforcement Telecommunication System
• MNOS — Metal-nitride-oxide Semiconductor
• VTIR — visible and thermal infrared radiometer
• QPM — QoS (Quality of Service) Policy Manager
• EFRC — Enhanced Full Rate Codec
• MOA — Managed Object Agent
• MOD — Modulo
• DCMES — Dublin Core Metadata Element Set
• STD — Secondary Telecom District
• UPS — Un-interruptable Power Supply
• BSC — Base Station Controller

• JWG — Joint Working Groupof
• UVG — Universal Voice Grade
• AFIPS — American Federation of Information Processing Societies
• CNE — Certified Novell Engineer
• DFRI — Datacom Reference Frame Input
• 4WE&M — Four-Wire Ear and Mouth
• CUG — Closed Users Group
• WAGN — West Antarctic GPS (Global Positioning System) Network
• WPBX — Wireless Private Branch Exchange
• DPT — Dial Pulse Terminate
• UPC — Usage Parameter Control
• HPPI — High-Performance Parallel Interface
• TBRL — Terminal Balance Return Loss
• RZ — Return to Zero
• APTC — Atlantic Provinces Telecommunications Council
• GPBX — Global Private Branch eXchange
• CM — Common Mode
• ACL — Asynchronous Connection-less Link
• WTP — Wireless Transaction Protocol
• EDT — European Deaf Telephone
• WIG — Wireless Internet Gateway
• REA — Rural Electrification Administration (US)
• ESM — electronic support measure
• WLNP — Wireless Local Number Portability
• VHM — Voice Health Monitor
• BS — Busy Season
• SAMA — Spread Aloha Multiple Access
• CMM — Calls, Minimums, Maximums
• MMC — Minimum Monthly Charge
• DACS — Digital Access Cross-Connect Switch
• MIC — Management Integration Consortium
• CTIT — College of Telecommunications and Information Technology
• AQP — Association for Quality and Participation
• EKTS — Electronic Key Telephone Set
• CR — Connection Request
• CTSO — Cellular Telephone Service Order
• GRUB — Greedy Reclamation of Unused Bandwidth
• LRF — Location Registration Function
• ITOC — Independent Telephone Operating Company
• LQR — Line Quality Report
• NECA — National Exchange Carrier Association
• IDEN — Integrated Dispatch Enhanced Network
• BONDING — Bandwidth On Demand Interoperability Group
• ENUM — tElephone NUmber Mapping
• WTIA — Wireless Technology Industry Association
• BTN — Billing Telephone Number
• UTRAN — UMTS (Universal Mobile Telecommunication System) Terrestrial Radio Access Network
• NSM — Network Status Monitor
• ATTRA — Appropriate Technology Transfer for Rural Areas
• ACL — Average Call Length

• TANE — Telephone Association of New England
• ESDS — Electrostatic Discharge Sensitive
• IMT-2000 — International Mobile Telecommunications 2000
• MHL — Mobile High-definition Link
• TON — IEEE/ACM Transactions On Networking
• APTG — Asia Pacific Telecom Group
• QPA — Quality Performance Analysis
• GTM — Go to Meeting
• CDPD — Cellular Digital Packet Data
• UDC — Universal Digital Channel
• RDI-P — Remote Defect Indicator - Path
• DAS — Distributed Antenna System
• AGPS — Assisted Global Positioning System
• DM — Design Manager
• WDRM — Wireless Design Reference Manual
• RFA — Recurrent Fault Analysis
• NARSAP — National Advanced Remote Sensing Application Program
• EEHO — Either End Hop Off
• DTU — Data Terminal Unit
• LOB — Line Of Bearing/Balance
• THL — Trans-Hybrid Loss
• IDSL — ISDN (Integrated Services Digital Network) Digital Subscriber Line
• FRAD — Frame Relay Assembler/Disassembler
• TME — Telocator Message Entry
• ECTEL — Eastern Caribbean TELecommunications Authority
• HSC — High Speed Connect
• UBT — Universal Backend Tester
• 888 — Freephone
• MO — Magneto-optic
• PTI — Payload Type Indicator
• CSL — component sublayer
• CTE — Computer Telephony Engine
• TTIL — Team Telecom International Ltd.
• CNI — Calling Number Identification
• SDLC — Systems Development Life Cycle
• IPOATM — Internet Protocol over ATM
• RANAP — Radio Access Network Application Part
• LSAP — Link Layer Service Access Point
• BMAS — Business Management System
• NICAD — Nickel Cadmium
• DISA — Direct Inward Switch Access
• VAB — Vehicle Assembly Building
• DX — Duplex Signaling
• CLIP — Caller Line Identification Presentation
• TPC — The Phone Company
• DVCC — Digital Verification Color Code
• PMD — Physical Media-Dependent
• FCFS — First-Come, First-Served
• LTU — Line Terminating Unit
• VC — Virtual Circuit (ATM)

• SM OFC — Single-Mode Optical Fiber Cable
• DTS — Digital Terminal Systems
• DUNCE — Dial-Up Networking Connection Enhancement
• TPSP — Third Party Service Provider
• AAV — Alternative Access Vendor
• PPCH — Packet Paging Channel
• SARTS — Switched Access Remote Test System
• ZLE — Zero-Latency Enterprise
• NETBIOS — Network Basic Input-Output System
• SMASE — Systems Management Application Service Element
• DBF — Digital Beam-Forming
• SSU — Synchronization Supply Unit
• FEFA — Far End Failure
• MFAS — Multi-Frame Alignment Signal