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Computing & IT >> Telecom Abbreviations

Look through 4999 acronyms and abbreviations related to Telecom:

• IPB — Invision Power Board
• XFMR — Transformer
• DDRS — Dynamic Data Rate Selection
• CBCU — Centralized Broadband Control Unit
• DCE — Data Circuit-terminating Equipment
• LAN — Local Area Network
• EBITDA — Earnings before Interest, Taxes, Depreciation and Amortization
• DWDM — Dense Wavelength Division Multiplexing
• DOE — Distributed Object Environment
• ECG — Electrocardiogram
• ETA — Estimated Time of Arrival
• YMMV — Your Mileage May Vary
• GFSK — Gaussian Frequency Shift Keying
• C3I — Command, Control, Communications & Intelligence
• SYN — Synchronous
• YTD — Year To Date
• XML — Extensible Markup Language
• CSR — Customer Service Representative
• CT — Computed Tomography
• BRDF — Bidirectional Reflectance Distribution Function
• APR — Annual Percentage Rate
• CSMA/CA — Carrier Sense Multiple Access/Collision Avoidance
• ROM — Read-Only Memory
• CSMA/CD — Carrier Sense Multiple Access with Collision Detection
• RDF — Resource Description Framework
• IQ — Intelligence Quotient
• ISAR — Inverse Synthetic-Aperture Radar
• IAMAI — Internet and Mobile Association of India
• CSMA/CD — Carrier sense multiple access / collision detection
• CONG — Congestion message
• CSMA — Carrier Sense Multiple Access
• YGWYPF — You Get What You Pay For
• ATOM — Any Transport over MPLS (Multi-Protocol Label Switching)
• FTP — File Transfer Protocol
• OIC — Oh I See
• LASER — Light Amplification By Stimulated Emission Of Radiation (cf. Maser)
• X-BAR — Crossbar telephone exchange
• MAN — Metropolitan Area Network
• FDIC — Federal Deposit Insurance Corporation
• RAEX — Roaming Agreement EXchange
• ASAP — As Soon As Possible (pronounced AY-sap)
• ANSI — American National Standards Institute, Inc.
• IT — Information Technology
• S-BCCH — Short Message Service Broadcast Control Channel
• XA-FR — Exchange Access Frame Relay
• 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.
• UAX 14 — Unit Automatic eXchange type 14
• DAM — Diagnostic Acceptability Measure
• X-OFF — Transmitter Off
• X-ON — Transmitter On

• LED — Light-Emitting Diode
• CPU — Central Processing Unit
• BPM — Beats Per Minute
• MLS — Microwave Landing System
• UK — United Kingdom of Great Britain and Northern Ireland
• S X S — Step-by-Step
• BBS — Bulletin Board Service
• DND — Do Not Disturb
• D-H — Diffie-Hellman
• ISO — In Search Of
• IRC — Internet Relay Chat
• ZDBOP — Ziff-Davis Benchmark Operation
• CPE — Customer Premises Equipment
• WACN ID — Wide Area Communications Network IDentifier
• OEM — Original Equipment Manufacturer (usually in reference to car parts)
• ADM — Add-Drop Multiplexer
• BTW — By The Way
• VIP — Very Important Person
• C-NBAP — Common Node B Application Part
• ATM — Automatic Teller Machine
• B-ICI — Broadband Inter-Carrier Interface
• SABGW — System Architecture Evolution Gateway
• DWDM — Dense Wavelength-Division Multiplexing
• A-KEY — Authentication key
• RFQ — Request For Quotation
• AUP — Acceptable Use Policy
• TEMIP — Telecommunications Management Information Platform
• OC-18 — Optical Carrier Signal, Level 18
• RF — Radio Frequency
• T-IC — T-interConnect
• M-CSI — Mobility management CAMEL (Customized Applications for Mobile network Enhanced Logic) Subscription Information
• F2F — Face To Face (also Meeting In Person)
• C4I — Command, Control, Communications, Computers, & Intelligence
• PPM — parts per million
• VC-ATOD — Virtual Clearinghouse on Alcohol, Tobacco and Other Drugs
• E-LEAD — Ear Lead
• H323 — ANSI standard for format over IP
• OC-9 — Optical Carrier Signal, Level 9
• I.LINK — IEEE 1394, High Performance Serial Bus, implementation
• OC-256 — Optical Carrier Signal, Level 256
• T-CARRIER — Trunk Carrier
• QC — Quality Control
• IP — Internet Protocol
• FIFO — First In, First Out
• FEMA — Federal Emergency Management Agency
• CDR — Critical Design Review
• ISO — International Organization for Standardization
• PDR — Preliminary Design Review
• KBYTE — Kilobyte (103)
• COB — close of business (End of duty day)

• DSC — Differential Scanning Calorimetry
• D-NBAP — Dedicated Node B Application Part
• EAP — Employee Assistance Program
• EDI — Electronic Data Interchange
• LLC — Limited Liability Company
• LCD — Liquid Crystal Display
• DAHDI — Digium/Asterisk Hardware Device Interface
• GSM — Global System for Mobile Communications
• VAZO — Violating All-Zero Octet
• IRR — Internal Rate of Return
• CCB — Change Control Board
• ECU — Electronic Control Unit
• WWW — World Wide Web
• AFAIK — As Far As I Know
• POC — Point Of Contact
• FET — Field Effect Transistor
• DBORS — Data Base of Records
• AC — Alternating Current
• ISP — Internet Service Provider
• ACH — Automated Clearing House
• WTG — Way To Go
• C³CM — Command, Control and Communications Countermeasures
• DAC — Discretionary Access Control
• CSA — Canadian Space Agency
• NMSE — Normalized Mean Square Error
• CY — Calendar Year
• VAT — Value Added Tax
• CEO — Chief Executive Officer
• UDP — User Datagram Protocol (FDDI related)
• URL — Universal Resource Locator
• ABI — Application Binary Interface
• CCTV — Closed-circuit television
• RFP — Request For Proposal
• BVR — Beyond Visual Range
• TQM — Total Quality Management
• LRU — Line Replaceable Unit
• AMD — Advanced Micro Devices, Inc. (producer of computer chips)
• SAR — Search And Rescue
• QFSK — Quadrature Frequency Shift Keying
• ASTM — American Society for Testing and Materials (Philadelphia, Pennsylvania)
• PDA — Personal Digital Assistant
• THX — Thanks
• ATTN — Attention
• CUG — Closed User Group
• IRL — In Real Life
• WML — Wireless Markup Language
• PDF — Portable Document Format (created by Adobe Acrobat)
• TNYWR — The Number You Will Receive
• RPI — Retail Price Index
• CV — Curriculum Vitae

• BTU — British Thermal Unit
• WBS — Work Breakdown Structure
• API — Application Programming Interface
• MOU — Memorandum of Understanding (an MOU between Food & Drug Administratin and a regulatory agency in another country allows mutual recognition of inspections)
• IPO — Initial Public Offering
• ASA — American Standards Association
• DOA — dead on arrival
• ESA — European Space Agency
• SMTP — Simple Mail Transfer Protocol
• RDY — Ready
• EDS — Electronic Data Systems Corporation
• ABC — activity based costing
• R&D — Research & Development
• AIR — Account Information and Refill
• ADSL — Asymmetric Digital Subscriber Line
• NYSE — New York Stock Exchange
• ASME — American Society of Mechanical Engineers
• GIS — Geographic Information System
• GATT — General Agreement on Tariffs and Trade (government)
• PDT — Pacific Daylight Time
• DFD — Displaced Frame Difference
• SRAM — Static Random Access Memory (ess-ram)
• EIS — Executive Information System
• CD — Compact Disc
• MRI — Magnetic Resonance Imaging
• ACE — Access Control Entry
• ATM — Asynchronous Transfer Mode
• EST — Eastern Standard Time
• ACC — Adaptive Cruise Control
• PSK — phase-shift keying
• WWW3 — World Wide Web Consortium
• DBMS — Database Management System
• MTBF — Mean Time Before Failure
• CCSDS — Consultative/Consultative Committee for Space Data Systems
• DSCP — Differentiated Services Control Point
• ASCII — American National Standard Code for Information Interchange
• ACK — ACKnowledgment
• MBR — Master Boot Record
• COR — Carrier Operated Relay
• NFS — Network File System
• CR — Carriage Return
• HTTP — Hypertext Transfer Protocol
• SLA — Service Level Agreement
• SD — Standard Deviation
• BRB — Be right back
• GUI — Graphical User Interface (goo-ey)
• ATA — Area Transportation Authority
• JV — Joint Venture
• CCM — counter-countermeasure
• SAN — Storage Area Network

• EPA — Environmental Protection Agency (US)
• AIS — Automated Information System
• NOS — Network Operating System
• GPS — Global Positioning System (ex-NAVSTAR)
• PCB — printed circuit board
• BIP — Bit-Interleaved Parity
• ICT — Information and Communication Technology
• AATSR — Advanced Along-Track Scanning Radiometer
• VM — Voice Mail
• PDH — Plesiochronous Digital Hierarchy
• WEP — Wired Equivalent Privacy
• EU — European Union (1994; formerly referred to as the EEC or EC)
• LRJ — Location Reject
• MST — Mountain Standard Time
• MB — Megabyte
• PUHU — Pick Up Hang Up
• AM — Ante Meridian
• RFC — Request For Comment
• SDMA — Space Division Multiple Access
• RAM — random-access memory
• FAA — Federal Aviation Administration
• CAE — Computer-Aided Engineering
• CIO — Chief Information Officer
• BUR — Bandwidth Usage Redundancy
• CPT — Carriage Paid To
• WDM — Wavelength Division Multiplexing (fiber optics)
• PO — Purchase Order
• AES — Advanced Encryption Standard
• P&L — Profit and Loss statement
• EOM — End Of Message
• TTYL — Talk To You Later (Internet Slang)
• CGI — Common Gateway Interface
• CS — Computer Science
• GPRS — General Packet Radio Service
• NPV — Net Present Value {economics}
• ATCRBS — Air Traffic Control Radar Beacon System
• FM — frequency modulation
• 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.
• CPM — Critical Path Method
• RDBMS — Relational Database Management System
• ARPA — Advanced Research Projects Agency (made early internet)
• FX — Foreign Exchange
• EC — European Commission
• RWR — Radar Warning Receiver
• ALC — Automatic Level Control
• MMS — Multimedia Messaging Service
• CRT — Cathode Ray Tube (type of TV)
• SME — Subject Matter Expert
• SDR — Special Drawing Rights
• IETF — Internet Engineering Task Force

• NIC — Network Interface Card
• COO — Chief Operation Officer
• QMS — Quality Management System
• WAN — Wide Area Network
• AM — Amplitude Modulation
• FAR — Federal Aviation Regulation
• CIS — Commonwealth of Independent States
• MIS — Management Information System (OSHA)
• FAQ — Frequently Asked Questions (sometimes Pronounced Fak)
• WWW — World Weather Watch
• BSD — Berkeley Software Distribution
• DES — Data Encryption Standard
• DB — Decibel
• PDN — Public Data Network
• DDD — Direct Distance Dial
• APT — Automatic Picture Transmission
• SCC — Standards Council of Canada
• STS — Space Transportation System
• Y2K — Year 2000
• SWAG — Scientific Wild Ass Guess
• AE — Account Executive
• MOB — Mobile
• ACO — Additional Call Offering
• ADD — Addendum
• AAC — Advanced Audio Coding
• CU — See You
• NATO — North Atlantic Treaty Organisation
• SLIP — Serial Line Interface Protocol
• DSA — Digital Signature Algorithm
• PVT — Private
• QOS — Quality of Service
• NPI — New Product Introduction
• DDL — Data Definition Language
• ACK — Acknowledge (telecommunications; Cf. NAK)
• SQA — Software Quality Assurance
• PGP — Pretty Good Privacy (encryption)
• CAUCE — Coalition Against Unsolicited Commercial Email
• RPM — Revolutions Per Minute, (Rotations Per Minute)
• DOD — United States Department of Defense
• RNC — Radio Network Controller
• UAV — Unmanned Aerial Vehicle
• ADR — Address
• SCSI — Small Computer System Interface
• ACD — Automatic Call Distributor
• TBD — To Be Determined
• VHF — Very High Frequency
• CIR — Committed Information Rate (Frame Relay)
• AOA — Angle Of Arrival
• MSN — Microsoft Network
• FIPS — Federal Information Processing Standard

• NIH — Not Invented Here
• SAS — Statistical Analysis System
• DMSP — Defense Meteorological Satellite Program (U.S.)
• DSS — Decision Support System
• EFF — Electronic Frontier Foundation
• UPS — Ultraviolet Photoelectron Spectroscopy
• IVR — Interactive Voice Response (telephone technology)
• DME — Distance Measuring Equipment
• DHCP — Dynamic Host Configuration Protocol
• RFI — Request For Information. Sales department shorthand. Special priority when use in conjunction with RFN (see below).
• ADM — Add/Drop Multiplexer
• PNG — Portable Network Graphics (graphic file standard/extension)
• AES — Auger Electron Spectroscopy
• QA — Center for Quality Assurance in International Education
• CAD — Computer Aided Designer
• CB — Call Back
• HSD — High Speed Data
• VPN — Virtual Private Network (ATM)
• ACM — Association for Computing Machinery
• ACE — Advanced Computing Environment
• DRAM — Dynamic Random Access Memory (dee-ram) (computing)
• DNS — Domain Name System
• EBCDIC — Extended Binary Coded Decimal Interchange Code (pronounced Eb-see-dik) (cf. BCD)
• ACL — Access Control List
• ABR — Available Bit Rate
• O&M — Operation and Maintenance
• AME — Amplitude Modulation Equivalent
• ABET — Accreditation Board for Engineering and Technology, Inc.
• JAXA — Japan Aerospace Exploration Agency
• CBT — Computer Based Training
• JIT — Just in time
• EEC — European Economic Community (predecessor of the European Union|EU)
• EW — Electronic Warfare
• 100BASE-T2 — 100 Megabits per Second, Baseband, Two-pair Category 3 UTP cables
• AD — Active Directory
• RM — Resource Management
• VR — Virtual Reality
• OCR — Optical Character Recognition
• CDR — Call-Detail Record
• PM — Preventive Maintenance
• POP — Point Of Presence (Internet)
• CRM — Customer Relationship Management
• DARPA — Defense Advanced Research Projects Agency (US)
• VVX — Voice and Video eXchange
• GSA — U.S. General Services Administration
• ISDN — Integrated Services Digital Network
• AOL — America on line
• TCB — Trusted Computing Base
• ASR — Airport Surveillance Radar
• DC — Direct Current

• AC — Access Control
• MTTR — Mean Time To Repair
• SLF — Super Low Frequency
• DOJ — Department of Justice (US)
• RACON — Radar Beacon
• WB — Welcome Back
• TCP — Transmission Control Protocol
• BCC — Blind Carbon Copy
• ROI — Return on Investment
• ECO — Engineering Change Order
• CC — Carbon Copy
• OMG — Object Management Group
• EVP — Executive Vice President
• DTE — Data Terminal Equipment
• DTX — Discontinuous Transmission
• AVHRR — Advanced Very High Resolution Radiometer  
• SOW — Statement Of Work
• RPC — Remote Procedure Call
• SMS — Short Message Service
• CU — Control Unit
• ISAKMP — Internet Security Association and Key Management Protocol
• ASK — amplitude shift keying
• CMI — Computer Managed Instruction
• SEI — Software Engineering Institute
• CCIS — Common Channel Interoffice Signaling
• QI — Quality Improvement
• USB — Universal Serial Bus
• NEC — National Electrical Code
• LEO — Low Earth Orbit (satellite communications)
• ATC — Air traffic control
• B3ZS — bipolar 3-zero substitution
• EMG — Electromyogram
• AAAI — American Association for Artificial Intelligence's
• RAID — Redundant Array of Inexpensive Disks
• AGC — Automatic Gain Control
• TCO — Total Cost of Ownership
• RU — Are You?
• FFT — Fast Fourier Transform
• CAM — computer aided manufacturing
• ENIAC — Electronic Numerical Integrator And Computer
• BR — Branch
• DFS — Distributed File System
• BECN — Backward Explicit Congestion Notification
• OBO — Or Best Offer
• TNSTAAFL — There's No Such Thing As A Free Lunch
• IRS — U.S. Internal Revenue Service
• EAP — Extensible Authentication Protocol
• UHF — Ultra High Frequency (300-3000 MHz; 1m-10cm)
• PERT — Program Evaluation and Review Technique
• ISRO — Indian Space Research Organisation

• ERP — Enterprise Resource Planning
• SDD — Software Design Document
• AF — Audio Frequency
• PC — Personal computer (host)
• SXS — Step-By-Step
• I/O — Input/Output
• VIRUS — Vital Information Resources Under Siege
• VTC — Video Teleconference
• ZIP — Zone Improvement Plan
• DMTS — Distinguished Member Of Technical Staff
• CFO — Communication Filing Officer
• MDA — Monochrome Display Adapter
• CFE — Contractor-Furnished Equipment
• TC — Telephone Call
• APIC — Advanced Programmable Interrupt Controller
• CRL — Certificate Revocation List
• DQE — Detective Quantum Efficiency
• WLTF — Wireless LAN (Local Area Network) Task Force
• IM — Instant Message
• DSL — Digital Subscriber Line
• BST — British Summer Time
• ATF — Advanced Tactical Fighter
• CM — Configuration Management
• ADPE — Automatic Data Processing Equipment
• SIC — Standard Industrial Classification (Code)
• HVAC — Heating, Ventilation, and Air Conditioning
• SP — Service Provider
• AGP — Accelerated Graphics Port
• OSI — Open Systems Interconnection (iso Standard)
• CLI — Command line Interface (Cabletron)
• PAR — Precision Approach Radar
• CBC — cipher block chaining
• UR — Your
• ATM — Adobe Type Manager
• PRI — Primary Rate Interface (ISDN)
• DLL — Dynamic Link Library (computer file)
• NMT — Nordic Mobile Telephone
• ERP — Enterprise Resource Management
• NSF — National Sanitation Foundation
• SGML — Standard Generalized Markup Language
• GRE — Generic Routing Encapsulation
• AP — Application Protocol
• SIG — Special Interest Group
• NIST — National Institute of Standards and Technology
• ATS — applications technology satellite
• MLS — Multiple Listing Service
• ITU — International Telecommunication Union
• DDE — Dynamic Data Exchange (in software parlance)
• WAFB — Wireless Absolute Fairness Bound
• SQL — Structured Query Language

• AE — Application Entity
• AQL — Acceptable Quality Level
• CAA — Civil Aviation Authority
• RM — Regional Manager
• PE — Polyethylene
• SBU — Strategic Business Units
• BPR — Business Process Re-engineering
• MAC — Message Authentication Code
• M — Meter
• W3C — World Wide Web Consortium
• ASP — Application Service Provider
• DSTE — Digital Subscriber Terminal Equipment
• DLR — Design Layout Record
• PLD — Programmable Logic Device
• LCP — Link Control Protocol
• CRC — Contrôle de Redondance Cyclique (French: Cyclic Redundancy Check)
• EEG — Electro-EncephaloGram
• TAC — Technical Assistance Center
• TV — Television
• FDDI — Fiber Distributed Data Interface
• Q&A — Question & Answer
• FCA — Free Carrier
• CDT — Central Daylight Time
• ERT — Emergency Response Team
• BBU — Baseband Unit
• CMM — Capability Maturity Model
• TOS — Type Of Service
• SOHO — Small Office Home Office
• AADC — Automated Area Distribution Center
• WIPO — World Intellectual Property Organization
• AAAS — American Association for the Advancement of Science
• CMS — Content Management System
• PT — Project Team
• LED — law enforcement desk; light emitting diode
• 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
• SAIC — Science Applications International Corporation
• NMR — Nuclear Magnetic Resonance
• AFC — Automatic Frequency Control
• OSS — Operational Support System
• ARP — Address Resolution Protocol (ATM)
• BBS — Bulletin Board System
• PMA — Physical Medium Attachment
• DMX — De-MultipleXer
• NSA — National Security Agency
• IRLAN — Infrared LAN
• CTD — Cumulative Trauma Disorder
• ISO — Infrared Space Observatory
• EGA — Enhanced Graphics Adapter
• PECVD — Plasma-Enhanced Chemical Vapor Deposition
• UAS — Unavailable Seconds

• AEC — Architecture, Engineering, Construction
• CST — Central Standard Time (UTC-6 Hours)
• MHS — Message Handling System (electronic)
• COQ — Cost Of Quality
• PLMN — Public Land Mobile Network
• EFT — Electronic Funds Transfer
• OSHA — Occupational Safety and Health Act (1970)
• RCU — Remote Control Unit
• HSDPA — High-Speed Downlink Packet Access
• Z — Zero
• CIM — Common Information Model
• ACFQ — Absence Compensation Fair Queuing
• IMPACT — Integrated Manufacturing Precision Assembly Cellular Technology
• QAM — quadrature amplitude modulation
• HZ — cycles per second (hertz)
• MIC — Message Integrity Check
• DIT — Directory Information Tree
• RFI — Radio Frequency Interference
• BCD — Binary-Coded Decimal
• MS — Message Store
• AT — Advanced Technology
• BS — Base Station
• USD — United States Dollar
• CIC — Circuit Identification Code
• EPR — Ethylene-Propylene Rubber
• CHAP — Challenge Handshake Authentication Protocol (ATM)
• CW — Continuous Wave
• CIM — Corporate Information Management
• BER — Bit-Error Rate
• UN — United Narions
• CAM — Computer-Aided Mapping
• CIA — Central Intelligence Agency
• DLC — Digital Loop Carrier
• MOS — Model Output Statistics
• UTC — Coordinated Universal Time
• BT — British Telecommunications
• NOAA — National Oceanic and Atmospheric Administration (US)
• FCW — Federal Computer Week
• SBC — Southwestern Bell Corporation
• SCM — Supply Chain Management
• NEMA — National Electric Manufacturer's Association
• NTIS — National Technical Information Service Technology Administration
• OS — Operating System
• VAC — Vacant
• AT&T — American Telephone and Telegraph (U.S. company, also known as "Ma Bell")
• B2B — Business to Businesse
• LF — Low Frequency
• DCN — Design Change Notification
• DOS — Disk Operating System
• DSA — Directory System Agent

• FCC — Federal Communications Commission (US)
• HDML — Handheld Device Markup Language
• MS — Mobile Station
• NTIA — National Telecommunications and Information Administration
• RTN — Regional Telecommunication Network
• PPB — parts per billion (109)
• PDU — Protocol data unit (such as segment, packet, frame, etc.)
• UI — User Interface
• ATN — Aeronautical Telecommunication Network
• RFO — Reason For Outage
• DQPSK — Differential Quadrature Phase-Shift Keying
• RDP — Radar Data Processing
• URI — Uniform Resource Identifier
• ADT — Abstract Data Type
• VDS — Variable Depth Sonar
• BPRZ — Bipolar Return-to-Zero
• NA — Not Applicable
• JIS — Japanese Industrial Standard
• SPC — Stored Program Control
• OSPF — Open Shortest Path First (ATM)
• WYSIWYG — What You See Is What You Get (pronounced Wizzy-wig. See Entry For Derived Acronyms)
• PM — Project Manager
• DCE — Distributed Computing Environment
• KISS — Keep It Simple Stupid
• EDVAC — Electronic Discrete Variable Automatic Computer
• RIP — Routing Information Protocol
• RCC — Rescue Coordination Center
• DT — DWDM (Dense Wavelength Division Multiplexing) Terminal
• EEPROM — Electrically Erasable Programmable Read-Only Memory
• MF — Medium Frequency
• LP — Low Pressure
• FTTB — Fiber To The Building
• HDLC — High-Level Data Link Control
• ISS — International Space Station
• BIS — Bureau of Indian Standards
• ICMP — Internet Control Message Protocol
• TPDU — Transport Protocol Data Unit
• ADF — Automatic Direction Finder
• AXE 10 — Series of electronic telephone exchanges from L.M. Ericsson
• IP — Intellectual Property
• DTI — Department of Trade and Industry (UK)
• PWD — Password
• AMI — Advanced Metering Infrastructure
• CDS — Cell Directory Service
• LLC — Logical Link Control
• ME — Mobile Equipment
• CUL — See You Later
• DNIS — Dialed Number Identification Service
• JPL — Jet Propulsion Laboratory (California Institute of Technology) (NASA)
• PSTN — Public Switched Telephone Network

• SVP — Senior Vice President
• IW — Information Warfare
• MS — Millisecond
• ISSN — International Standard Serial Number (ISO 3297)
• FC — Fibre Channel
• NAS — Network Access Server
• DMA — direct memory access (computer term)
• BRI — Basic Rate Interface
• DSSS — Direct Sequence Spread Spectrum
• SAE — Society of Automotive Engineers
• SSM — Source-Specific Multicast
• IS — Intermediate System
• SIL — Speech Interference Level
• DTR — Data Terminal Ready
• CERT — Computer Emergency Response Team
• TNX — Thanks
• JSC — Johnson Space Center (Houston, TX)
• AT — Access Tandem
• CLNP — ConnectionLess-mode Network Protocol
• TM — Technical Manual
• IANA — Internet Assigned Numbers Authority
• RFS — Request For Service
• ASQC — American Society for Quality Control's
• ISBN — International Standard Book Number (ISO 2108)
• AWG — American Wire Gauge
• HW — Hardware
• RAD — Rapid Application Development
• PAL — Programmable Array Logic
• AS — Autonomous System
• KHZ — kilohertz (1000 cycles per second)
• YP — Yellow Pages
• DPC — Destination Point Code
• MVS — Multiple Virtual Storage
• CDMA — Code Division Multiple Access (voice/data transmission)
• AMT — Amount
• JPEG — Joint Photographic Experts Group (24-bit image storage format)
• WMO — World Meteorological Organization (ICSU)
• CC — Call Control
• ECN — Explicit Congestion Notification
• CORBA — Common Object Request Broker Architecture
• DOM — Document Object Model
• RTU — Remote Terminal Unit
• RQMT — Requirement
• TS — Technical Specification
• VB — Visual Basic
• ARA — Apple Remote Access
• MRC — Monthly Recurring Charge
• CS — Cable Select
• TLS — Transport Layer Security
• SEM — Space Environment Monitor

• RACF — Resource Access Control Facility
• OM — Old Man
• VM — Virtual Machine
• ROFL — Rolling on the floor laughing
• WMAN — Wireless Metropolitan Area Network
• CBDS — Connectionless Broadband Data Service
• KM — Knowledge Management
• MS — Management System
• EDD — Envelope Delay Distortion
• PABX — private automatic branch exchange (telephone)
• NESDIS — National Environmental Satellite, Data, and Information Service
• FASB — Financial Accounting Standards Board
• PBX — Private Branch eXchange (company phone system)
• BNSC — British National Space Centre
• T&C — Terms & Conditions
• EISA — Extended Industry Standard Architecture
• ROS — Return on Sales
• GB — Gigabyte
• APC — American Power Conversion
• COO — Cost of Ownership
• EOT — End Of Transmission
• MHS — Microwave Humidity Sounder
• AR — Access Rate
• CEV — Controlled Environment Vault
• STI — Speech Transmission Index
• CATV — Community Antenna Television
• IEC — International Electrotechnical Commission
• IS — International Standard
• ADT — Atlantic Daylight Time (UTC-3 Hours)
• AML — Amplitude Modulated Link
• FCS — Frame check sequence (Ethernet)
• HF — High Frequency
• SHA — Secure Hash Algorithm
• SVC — Scalable Video Coding
• CG — Coast Guard
• OMS — Optical Multiplex Section
• NIST — National Institute of Standards & Technology (US)
• AT&T — American Telephone & Telegraph
• MDF — Main Distribution Frame
• MPI — Message Passing Interface
• SNR — Signal-to-Noise Ratio
• LSR — Local Service Request
• RTS — Request To Send
• PDS — Protected Distribution System
• PIN — Personal Identification Number
• TCP/IP — transmission control protocol/internet protocol
• SNMP — Simple Network Management Protocol (ATM)
• IPX — Internetwork Packet Exchange
• OTN — Optical Transport Network
• EDT — Eastern Daylight Time

• CATV — Cable Television
• NRC — National Research Council (Canada)
• 3G — Third Generation mobile phone network
• NBS — National Bureau of Standards (US)
• RSVD — Reserved
• COMJAM — Communications Jamming
• BSOD — Blue Screen Of Death
• WS — Workstation
• ISAS — Institute of Space and Astronautical Sciences (Japan)
• FCA — Free Carrier Absorption
• SSL — Secure Socket Layer
• PPP — Point-to-Point Protocol
• PCI — Peripheral Component Interconnect
• MIME — Multipurpose Internet Mail Extension
• OFC — Office
• SCADA — Supervisory Control And Data Aquisition
• LCN — Logical Channel Number
• ITSEC — Information Technology Security Evaluation Criteria
• PST — Pacific Standard Time (UTC-8 Hours)
• DS — Digital Signal
• DCS — Digital Cross-connect System
• BRA — Basic Rate Access
• PRF — Pulse Repetition Frequency
• COM — Component Object Model
• IDT — Integrated Digital Terminal
• BPS — bits per second
• ARPU — Average Revenue Per User
• AVL — Available
• VOL — Volume
• WTO — World Trade Organisation
• LEC — Local Exchange Carrier
• EDP — Electronic Data Processing Plc (London Stock Exchange [LSE])
• DNS — Domain Name Service
• ISI — Inter-Symbol Interference
• ASI — Asynchronous Serial Interface
• EPR — Electron Paramagnetic Resonance
• VOD — Video On Demand
• MCSD — Microsoft Certified Solution Developer
• HTTPS — HyperText Transfer Protocol Secure
• B2C — Business-to-Consumer
• LF — Line Feed
• ECP — Engineering Change Proposals
• SA — Scientific American
• E — Energy
• NOTAM — Notice to Airmen
• CO — Certificate of Origin
• PAN — Personal Area Network
• AMI — Alternate Mark Inversion
• ADN — Advanced Digital Network
• DCOM — Distributed Component Object Model

• TBD — To Be Decided
• CABS — Carrier Access Billing System
• SML/SMS — Service Management Layer/Service Management Service
• SIT — Static Induction Transistor
• NAFTA — North American Free Trade Agreement
• ADC — Analog-Digital Converter
• MMU — Memory Management Unit
• NI — Network Interface
• ATSR — Along-Track Scanning Radiometer
• MAC — Media Access Control
• RH — Relative Humidity
• NLMS — Normalized Least Mean Square
• NTFS — New Technology File System
• PM — post meridian
• 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
• CA — Certificate Authority
• FXO — Foreign Exchange Office
• ZIP — Zone Information Protocol
• AFSK — Audio Frequency Shift Keying
• DIBL — Drain-induced Barrier Lowering
• CAB — Conformity Assessment Body
• BYOD — Bring Your Own Device
• ISA — Industry Standard Architecture
• ICANN — Internet Corporation for Assigned Names and Numbers
• D-RAM — Dynamic Random Access Memory
• DASD — Direct Access Storage Device
• LPE — Liquid Phase Epitaxy
• F — Fellow
• LD — Long Distance
• WAP — Wireless Application Protocol
• IN — Intelligent Network
• FA — Functional Area
• TE — Traffic Engineering
• DIS — Distributed Interactive Simulation
• SM — Senior Member
• DSP — Digital Signal Processor
• LPC — Linear Predictive Coding
• UAN — Universal Access Number
• LMS — Learning management system
• UA — User Agent
• RCV — Receive
• VOP — Voice Over Packet
• MC — Message Center
• ECE — Economische Commissie voor Europa (United Nations) (Dutch: Economic Commission for Europe)
• AFS — Andrew File System
• AIS — Alarm Indication Signal
• VLF — Very Low Frequency
• RMS — root mean square (preferred over "RMS")
• STP — Spanning Tree Protocol
• ELINT — Electronic Intelligence Satellite

• SPC — Statistical Process Control. Forerunning quality theory from the 1960s to TQC and TQM.
• NIC — Network Information Center
• ACR — Attenuation Crosstalk Ratio
• CGI — Computer-Generated Imagery
• TB — Terabyte
• ELF — Extremely Low Frequency
• TOP — Technical Office Protocol
• WB — Write Back
• HSS — Home Subscriber Server
• SCTP — Stream Control Transmission Protocol
• STP — standard temperature and pressure (0° and 1 atm)
• OAS — Organization of American States
• APPL — Application
• TEC — Total Electron Content
• MIPS — Millions of Instructions Per Second
• AU — Audio Unit
• MDA — Model Driven Architecture
• PAP — Password Authentication Protocol (ATM)
• ACTV — Active
• 1000BASE-T — 1000 Megabits per Second, Baseband, Twisted Pair
• STM — Short Term Memory
• ESTEC — European Space Research and Technology Centre
• CAN — Campus Area Network
• MSU — Microwave Sounding Unit
• FCP — Fibre Channel Protocol
• WG — Working Group
• SPI — Service Provider Interface
• CSO — Customer Service Operations
• USGS — United States Geological Survey (DOI)
• CIS — CompuServe Information Service
• ASEAN — Association of South East Asian Nations
• ECT — Explicit Call Transfer
• ASQ — Alpha System Qualification
• VLL — Virtual Leased Line
• DUP — Duplicate
• EPABX — Electronic Private Automatic Branch Exchange
• BUS — Business
• IP — Intelligent Peripheral
• UL — Uplink
• EAS — Extended Area Service
• CRO — Central Records Office
• ECMA — European Computer Manufacturer's Association
• ES — Errored Second
• STP — Signal Transfer Point
• CAV — Constant Angular Velocity
• FR — Frame Relay
• NCSA — National Center for Supercomputing Applications
• EMS — Express Mail Service
• RSVP — Resource Reservation Protocol (Internet)
• DAP — Directory Access Protocol

• MSR — Microwave Scanning Radiometer
• CMP — Connection Management Protocol
• STA — State
• NIS — Network Information Service
• BGP — Border Gateway Protocol (routing protocol)
• P — Predicted
• WPAN — Wireless Personal Area Network
• ASR — Access Service Request
• NCS — National Communications System
• ANI — Automatic Number Identification (Caller ID)
• SEC — Software Engineering Center
• AMLCD — Active Matrix Liquid Crystal Display
• EMC — Electromagnetic Compatibility
• C4 — Command, Control, Communications, and Computers
• AMHS — Automated Message Handling System
• MME — Mobility Management Entity
• CRIS — Carrier Route Information System
• NLM — National Library of Medicine (National Institutes of Health)
• IIS — Internet Information Services
• DCP — Design Change Package
• CCSD — command communications service designator; control communications service designator
• BT — BlueTooth
• MIB — Management Information Base (ATM)
• CAC — Carrier Access Code
• MSE — Mobile Subscriber Equipment
• ASR — Automatic Speech Recognition
• MCU — Multipoint Control Unit
• MTSO — Mobile Telephone Switching Office
• AFP — AppleTalk Filing Protocol
• DA — Destination Address
• BACP — Bandwidth Allocation Control Protocol
• M — Management
• PVC — Permanent Virtual Circuit (ATM)
• CT — Computer Telephony
• TAG — Technical Advisory Group for Biological Control Agents of Weeds
• GDS — Global Distribution System
• AEW — Airborne Early Warning
• CF — Compact Flash
• TCSEC — Trusted Computer System Evaluation Criteria
• PD — Public Domain
• DMARC — Demarcation point
• MD — Mediation Device
• ESS — Electronic Switching System
• DSN — Deep Space Network - network of large antennas and communication facilities.
• FUP — Fair Use Policy
• MP — Multilink Protocol
• PGA — Programmable Gate Array
• CSPRM — Common Signaling Protocols Resource Module
• NOC — Network Operations Center
• SCP — Service Control Point

• ARPANET — ARPA Network
• FTTH — Fiber To The Home
• TG — Task Group
• IMEI — International Mobile Equipment Identity
• JST — Japan Standard Time
• TWT — Traveling Wave Tube
• CFD — computational fluid dynamics
• RDF — Radio Direction Finder
• DVP — Digital Voice Privacy
• SAR — Specific Absorption Rate
• SPADATS — Space Detection And Tracking System
• MCD — Magnetic Circular Dichroism
• LZ — Landing Zone
• OLE — Object Linking and Embedding (Microsoft communication protocol)
• CFA — Carrier Facility Assignment
• TRM — Technical Reference Model
• STK — Satellite Tool Kit
• YL — Young Lady
• EMR — Electromagnetic Radiation
• SVD — Singular Value Decomposition
• CG — Center of Gravity (DXS)
• CIFS — Common Internet File System
• AYT — Are You There
• CCTA — Central Computer and Telecommunications Agency
• CTS — Clear To Send
• ECR — Electronic Cash Register
• CHF — Swiss Franc
• SOAP — Simple Object Access Protocol
• RA — Risk Analysis
• RT — Remote Terminal
• DBS — Direct Broadcast Satellite
• DID — direct inward dial
• ACT — ACTIVITY, ACTIVITIES
• RFD — Request For Discussion
• SW — South West
• ADEOS — ADvanced Earth Observing Satellite (Japan)
• LDAP — Lightweight Directory Access Protocol (pronounced Ell-dap)
• GOS — Grade Of Service
• RARP — Reverse Address Resolution Protocol
• VOIP — Voice Over IP (Internet Protocol)
• WPM — speech--words per minute
• RAN — Radio Access Network
• OPC — Originating Point Code
• BOC — Bell Operating Company
• UPS — Uninterruptible Power Supply
• ASIC — application-specific integration circuit
• DUC — Digital Up-Converter
• STN — Station Casinos, Inc.
• CMT — Cadmium Mercury Telluride
• NMS — Network Management System

• OSTP — Office of Science and Technology Policy
• BIOS — Basic Input Output System
• CSAT — Customer Satisfaction
• OLAP — Online Analytical Processing
• AOI — Area Of Interest
• JVM — Java Virtual Machine
• EAI — Enterprise Application Integration
• PPARC — Particle Physics and Astronomy Research Council
• Y — Yttrium
• TN — Telephone Number
• BS — Beam Splitter
• RSN — Real Soon Now [which may be a long time coming]
• SLP — Service Location Protocol
• BPDU — Bridge Protocol Data Unit
• FITS — Flexible Image Transport System
• ADCCP — Advanced Data Communications Control Procedures
• AAS — Adaptive Antenna System
• SHF — Super High Frequency
• ROSAT — Roentgen Satellite
• TO — Technical Order
• DDS — Digital Data Service
• BIP — Band Interleaved by Pixel
• LLU — Local Loop Unbundling
• IRS — Interface Requirements Specification
• BERT — Bit Error Rate Tester (telecommunication)
• SAN — System Area Network
• EAC — Engineering Accreditation Commission
• SBC — Session Border Controller
• RSRQ — Reference Signal Received Quality
• PUB — Publication (file name extension)
• PKI — Public Key Infrastructure (cryptography)
• DX — Duplex
• IRDA — Infrared Data Association
• YYP — Yahoo Yellow Pages
• TOS — Temporarily Out of Service
• CBP — Coded Block Pattern
• PCMCIA — Personal Computer Memory Card International Association
• WPS — Wireless Priority Service
• MTU — Maximum Transmission Unit
• WWAN — Wireless Wide Area Network
• CGM — Computer Graphics Metafile
• DC — Disconnected
• FE — Far End
• ARINC — Aeronautical Radio Incorporated
• PDC — Personal Digital Cellular
• APM — Advanced Power Management
• PSD — Phase-Sensitive Detector
• OC — Optical Carrier
• IS — Information System
• MCA — Micro Channel Architecture

• LEN — Line Equipment Number
• OAM&P — Operations, Administration, Maintenance & Provisioning
• FAX — Facsimile
• DEC — Decimal
• ESF — Edge Spread Function
• OTS — Optical Transmission Section
• DAL — Dedicated Access Line
• FR PVC — Frame Relay Permanent Virtual Connection
• DOT — Department of Telecommunications (India)
• MPLS — Multi Protocol Label Switching
• BG — Background
• VOC — Volatile Organic Compounds (air pollution)
• APS — Automatic Protection Switching (SONET/SDH)
• RT — Radiotelephone
• VXML — Voice eXtensible Markup Language
• YAHOO — You Are Hazy Over Oranges
• EFS — Encrypting File System
• LU — Logical Unit
• LEP — Large Electron Positron
• TLC — The Learning Channel
• ROTFL — Roll On The Floor Laughing
• SPGA — Staggered Pin Grid Array
• MOL — Manned Orbiting Laboratory
• MBPS — Megabits per second
• CMD — Command
• ECAC — European Civil Aviation Conference
• DRM — Digital Rights Management
• EEA — European Economic Area
• CAD — Computer-Aided Design
• RCS — Radar Cross Section
• DID — Digital Information Display
• DCS — Digital Cross-Connect
• NNM — Network Node Manager
• SKU — Stockkeeping Unit
• KB — Kilobyte: One thousand and twenty-four bytes kbps kilo bit per second
• AAF — Advanced Authoring Format
• EX — Exercise
• AIN — Advanced Intelligent Network
• CES — Consumer Electronics Show
• FAT — File Allocation Table
• METRO — Metropolitan
• VGA — Video Graphics Array
• VAS — Value Added Services
• VC — Virtual Channel
• ETS — European Telecommunication Standard
• SVC — Switched Virtual Connection
• ACPI — Advanced Configuration and Power Interface
• CNM — Customer Network Management
• SATAN — Security Administrator Tool for Analyzing Networks
• CD — Critical Dimension

• CMC — Career Management Center
• TE — Test Equipment
• Y — Yes
• CAPS — Call Attempts Per Second
• CCD — Charge Coupled Device - a device for the movement of electrical charge.
• 10BASE-T — 10 Megabits per second, Baseband, Twisted pair
• MGMT — Management
• PDS — Planetary Data System
• ARC — Army Reuse Center
• ADL — Advanced Distributed Learning
• TE — Terminal Equipment
• DCMI — Dublin Core Metadata Initiative (Online Computer Library Center)
• SL — Single Line
• ARIN — American Registry for Internet Numbers
• E&M — ear and mouth (special signaling leads)
• CER — Cell Error Ratio
• CU — Channel Unit
• ECPA — Electronic Communications Privacy Act 1986
• ASARS — Advanced Synthetic Aperture Radar System
• IV — Initialization Vector
• MOD — Modify
• FAA — Federal Aviation Agency
• QPSK — aeronautical quadrature phase shift keying
• ECP — Encryption Control Protocol
• SDH — Synchronous Digital Hierarchy (ATM)
• NIC — Network Interface Controller
• EIP — Equipment installation procedure
• RJ-25 — Registered Jack type 25 (6-wire connector)
• CBEMA — Computer & Business Equipment Manufacturers Association
• NNTP — Network News Transfer Protocol
• ATA — Analog Telephone Adapter
• SCN — Switched Circuit Network
• DC — Display Controller
• WLAN — Wireless Local Area Network
• AM — Activity Manager
• ACT — Activity
• 2W — Two Wire
• CB — Common Battery
• PDN — Packet Data Network
• ITP — Interactive Telecommunications Program
• DL — Digital Library
• AIFF — Audio Interchange File Format
• A — Anode
• IMSI — International Mobile Subscriber Identity
• PCM — Pulse-Code Modulation
• TI — Time Interval
• ARG — Argument
• DID — data item description
• 100BASE-T4 — 100 Megabits per Second, Baseband, Four-pair Category 3 UTP cables
• MIT — Massachusetts Institute of Technology (U.S.)

• SOGA — Share of Gross Adds
• BOFH — Bastard Operator From Hell
• ADP — Automatic Data Processor
• UML — Unified Modeling Language (Object Management Group, OMG)
• NFPA — National Fire Protection Association
• CDC — Connected Device Configuration
• FE — Finite Element
• NIMBY — Not In My Back Yard
• CICS — Customer Information Control System (IBM Mainframe Software; Kicks Or C-I-C-S)
• TSR — Telecommunications Service Request
• HTML — Hyper Text Markup Language
• DSLAM — Digital Subscriber Line Access Multiplexer (Module)
• EC — European Community
• PS — Product Specification
• B3G — Beyond Third Generation
• EOB — End Of Business
• DCN — Disconnect
• PET — positron emission tomography
• ECM — Electronic Counter Measures
• ITT — Invitation To Tender
• AUD — Audit
• SF — Single Frequency
• IRS — Inertial Reference System
• FDL — Facility Data Link
• E — Echo
• Q — Quadrature
• NES — Network Encryption System
• BS — Broadcast Satellite
• ATC — Advanced Technology Center
• BTC — Botswana Telecommunications Corporation
• RT — Response Time
• 9 — Nine
• FSK — Frequency-Shift Keying
• HDSL — High-bit-rate Digital Subscriber Line
• TIA — Telecommunications Industry Association
• CAM — Content Addressable Memory
• ADF — automatic document feeder
• CDA — Command and Data Acquisition
• 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)
• SD — Software Development
• AFM — Atomic Force Microscopy
• CO — Central Office
• 911 — Emergency Services Phone Number
• BJT — Bipolar Junction Transistor
• IMC — Intermediate Metal Conduit
• PTA — Pakistan Telecommunication Authority
• BCH — Binary Coded Hexadecimal
• BOD — Bandwidth on Demand
• EHF — Extremely High Frequency
• ODBC — Open Database Connectivity

• NPA — Numbering Plan Area
• TCM — Trellis-Coded Modulation
• CS — Convergence Sublayer (ATM)
• ASTD — American Society of Training and Development (Alexandria, Virginia)
• ELT — Emergency Locator Transmitter
• TCR — Temperature Coefficient of Resistance
• PIM — Personal Information Manager
• VT — Vacuum Tube
• SMB — Server Message Block
• MX — Mixer
• DCS — Digital Cellular System
• CFD — Call For Discussion
• TTY — Teletype Telex Machine
• B-ISDN — Broadband Integrated Services Digital Network
• SRS — Software Requirements Specifications
• POTS — Plain Old Telephone Service (FCW)
• PE — Probable Error
• SML — Service Management Layer
• AN — Access Node
• CBR — Constant Bit Rate
• ACF — Access Control Field
• E — Echo Time Zone
• BSS — Basic Service Set
• ACLR — Adjacent Channel Leakage Ratio
• FWA — Fixed Wireless Access
• ARQ — Automatic Repeat-reQuest
• AS — Access System
• PIC — Peripheral Interface Controller
• AAV — Accountholder Authentication Value
• TDOA — Time Difference Of Arrival
• OTA — Office of Technology Assessment (U.S.; abolished by Congress, Fall 1995)
• LQR — Linear Quadratic Regulator
• VSAT — Very Small Aperture Terminal (satellite service)
• RSS — Really Simple Syndication
• MCC — Mission Control Center (JSC)
• SDLC — Synchronous Data Link Control
• PG — Page
• LNP — Local Number Portability
• SDK — Software Development Kit (Microsoft)
• VCC — Virtual Channel Connection (ATM)
• LT — Less Than
• UP — User Profile
• B6ZS — Bipolar 6 Zero Substitution
• BSS — Base Station Subsystem
• EFIS — Electronic Flight Information System
• NCSC — National Computer Security Center (NSA)
• TOA — Time Of Arrival
• 100BASE-T — 100 Megabits per second, Baseband, Twisted pair
• NSAI — National Standards Authority of Ireland
• ABN — Abnormal

• SUS — Suspension
• WINS — Windows Internet Name Service
• PMP — Project Management Professional
• CQA — Certified Quality Auditor
• VT — Virtual Terminal
• GHZ — Gigahertz
• TDMA — Time Division Multiple Access
• BIU — Bus Interface Unit
• IT — Integration Test
• COMDEX — Computer Dealers Exposition
• SAS — Special Access Surcharge
• TDM — Time Division Multiplexer
• DNIC — Data Network Identification Code
• DPL — Digital Power Line
• MBWA — Mobile Broadband Wireless Access
• FEP — Front End Processor
• NOAO — National Optical Astronomy Observatories (Tucson, AZ)
• RMI — Remote Method Invocation
• EMEA — Europe, Middle East and Africa
• WAIS — Wide Area Information Server
• NE — North-East
• COPS — Common Open Policy Service
• TMS — Time Management System
• DTMF — Dual-Tone MultiFrequency
• PVD — Physical Vapor Deposition
• ES — Emergency Service
• JAN — Joint Army-Navy
• AMSS — Automatic Message Switching System
• HEHO — Head End Hop Off
• COAX — Coaxial
• VOA — Voice Of America
• SPM — Scanning Probe Microscope
• TELECOMMUTE — Telecommuting
• VBR — Variable Bit Rate (ATM)
• VMS — Virtual Memory System
• SIM — Subscriber Identity Module
• RP — Reference Point
• OSCAR — Orbiting Satellite Carrying Amateur Radio
• LRC — Learning Resource Center
• BAN — Base Area Network
• DAT — Digital Audio Tape
• SPA — Software Publishers Association
• ISM — Industrial, Scientific and Medical
• EIGRP — Enhanced Interior Gateway Routing Protocol
• JCL — Job Control Language
• EM — Electromigration
• BSA — Business Software Alliance
• SZ — Seizure
• ESP — Encapsulating Security Payload
• FEP — Front-End Processor

• NTP — Network Time Protocol
• IESG — Internet Engineering Steering Group
• IRQ — Interrupt Request
• FRS — Frame Relay Service
• EGP — Exterior Gateway Protocol
• MIDP — Mobile Information Device Profile
• PM — Phase Modulation
• TLK — Talk
• TEL — Telephone
• ORB — Object Request Broker
• PC — Peripheral Controller
• CBWFQ — Class Based Weighted Fair Queueing
• TTY — teletype terminal
• ADT — American District Telegraph Company
• NA — Network Adapter
• DDN — U.S. Defense Data Network
• PEM — Privacy-Enhanced Mail
• RRN — Routing Recording Number
• SA — Source Address
• DIS — Draft International Standard
• AIT — Automatic Identification Technology
• ASDE — Airport Surface Detection Equipment
• RADIUS — Remote Authentication Dial-In User Service
• ATS — Automatic Transfer Switch
• BHCA — Busy Hour Call Attempt
• MAI — Multiple Access Interference
• ACAP — Application Configuration Access Protocol
• VLSI — Very-Large-Scale Integration
• PDT — Portable Data Terminal
• 2W — 2-Wire
• CPC — Continous Packet Compression
• CFV — Call For Vote(s)
• BBM — Blackberry Messenger
• PP — Polypropylene
• FRS — Family Radio Service
• CTU — Central Terminal Unit
• MIS — Management Information Service
• FEC — Forward Error Correction
• CGA — Carrier Group Alarm
• DS-0 — Digital Signal, Level 0
• C — Cost
• EMCON — Electromagnetic Emission Control
• TOVS — TIROS Operational Vertical Sounder
• QDR — Quad Data Rate
• TKIP — Temporal Key Integrity Protocol
• EIA — Extended Interaction Amplifier
• AWACS — Airborne Warning And Control System
• AMPS — Advanced Mobile Phone System
• SMR — Specialized Mobile Radio
• BER — Basic Encoding Rules (ASN.1)

• NRPB — National Radiological Protection Board
• TCPA — Telephone Consumer Protection Act
• CB — Citizens' Band
• VBA — Visual BASIC for Applications
• TSB — Telecommunication Standardization Bureau
• DDL — Digital Data Link
• NSS — Network Switching Subsystem
• MPEG — Motion Picture Experts Group
• SPX — Sequenced Packet Exchange
• CDE — Common Desktop Environment
• DSS — Digital Signature Standard
• TTY — Text Teletype
• CAP — Capability
• GMRS — General Mobile Radio Service
• IEEE — Institute of Electrical and Electronics Engineers
• DTD — Document Type Definition (XML)
• DEMUX — Demultiplexer
• SB — Switchboard
• MDM — Mobile Device Management
• KAK — Key-Auto-Key
• MLP — Mobile Location Protocol
• TDD — Time Division Duplex
• WTLS — Wireless Transport Layer Security
• PSS — Performance Support System
• ACE — Adaptive Communication Environment
• BS — Backing Store
• GDM — GSM (Global System for Mobile communications) Data Module
• DL — Data Link
• LISP — List Processing Language
• CPS — characters per second
• AP — access point
• CGSA — Cellular Geographic Service Area
• LASA — Large Aperture Seismic Array
• PU — Physical Unit (IBM)
• BTAM — Basic Telecommunications Access Method
• CPS — Cycles Per Second (now Hertz)
• NIU — Network Interface Unit
• FAS — Frame Alignment Signal
• TCIC — Trunk Circuit Identification Code
• TSE — Toronto Stock Exchange
• SAR — synthetic aperture radar (satellite)
• ISOC — Internet Society
• VPI — Virtual Path Identifier
• POE — power over ethernetinjector
• BIS — Business Information System
• XPS — X-Ray Photoelectron Spectroscopy
• PVC — Permanent Virtual Connection
• JTF — Joint Task Force
• MV — Motion Vector
• SLV — Satellite-Launch Vehicle

• VF — Voice Frequency
• HEX — Hexadecimal (base 16)
• DCE — Data Communication Equipment
• ASA — Acoustical Society of America
• MTS — Message Transfer System
• E — Electra
• APN — An Access Point Name
• RDS — Rate Determining Step
• EST — Establish
• SG — Signaling Gateway (IETF)
• SWAP — Shared Wireless Access Protocol
• SIL — Silence
• CS-PDU — Convergence Sublayer - Protocol Data Unit
• IEC — Interexchange Carrier
• SRM — Scalable Reliable Multicast
• TTYL — Type To You Later
• SLIC — Subscriber Line Interface Circuit
• AC — Area Code
• IRC — International Record Carrier
• LATA — Local Access and Transport Area
• SLAM — Scanning Laser Acoustic Microscope
• DMI — Distributed Management Interface
• NCP — Network Control Protocol
• SPD — Serial Presence Detect
• HLR — Home Location Register
• O/S — Operating System
• JRE — Java Runtime Environment
• FLM — First Line Maintenance
• OMA — Open Mobile Alliance
• PROM — Programmable Read-Only Memory
• EMS — Element Management System (ATM)
• ADB — Apple Desktop Bus
• HFC — Hybrid Fiber/Coaxial network
• DPDU — Data Protocol Data Unit
• CSC — Common Signaling Channel
• RDI — Remote Defect Indicator (UNI Fault Management)
• IAB — Internet Architecture Board
• WHT — Walsh-Hadamard Transform
• DER — Distinguished Encoding Rules
• ADN — Abbreviated Dialing Number
• IPS — InPlane Switching
• ER — Extended Range
• COMINT — Communications Intelligence
• EECM — End-to-End Call Manager
• DN — Distinguished Name
• DPSK — Differential Phase Shift Keying
• CP — Change Proposal
• PCI — Personal Computer Interface
• NDVI — Normalized Difference Vegetation Index
• FEXT — Far-End Cross Talk

• 3GPP — Third Generation Partnership Project
• STD — Subscriber Trunk Dialing
• CRLF — Carriage-Return Line-Feed
• CSPDN — Circuit Switched Public Data Network
• AMPS — Advanced Mobile Phone Service (cellular phone standard)
• DAP — Distributed Array Processor
• CAL — Calorie
• DII — Defense Information Infrastructure
• SIA — Securities Industry Association
• KDC — Kerberos Key Distribution Center
• DPL — Digital Private-Line
• DII — Dynamic Invocation Interface
• TAD — Telephone Answering Device
• IDF — Independent Distribution Frame
• CODEC — Coder/decoder
• TRMM — Tropical Rainfall Measuring Mission (US-Japan)
• SQ — Service Quality
• BCH — Bose-Chaudhuri-Hocquenghem Coding
• FITL — Fiber-In-The-Loop
• LD — Laser Diode
• DMS — Data Management System
• CVR — Crystal Video Receiver
• CI — Common Interface
• CSA — Canadian Standards Association (like UL)
• COM — Comedy Central
• CAM — Common Access Method
• ETF — Early Termination Fee
• TL1 — Transaction Language 1
• FH — Frequency Hopping
• RJ-14 — Registered Jack type 14 (2-wire connector)
• FMC — Fixed Mobile Convergence "Mobile UC or Unified Communications over Wireless"
• CP — Call Processing
• CAMA — Centralized Automatic Message Accounting
• EU — End User
• 1FB — Single line, Flat Business rate;
• DTN — Data Transfer Network
• CIAC — Computer Incident Advisory Capability
• CCNA — Cisco Certified Network Associated
• BA — Behaviour Aggregate
• ADC — Administration Center
• FDTD — Finite Difference Time Domain
• TDD — Telecommunications Device for the Deaf
• ALT — Accelerated Life Test
• L2TPV3 — Layer 2 Tunneling Protocol Version 3
• CPN — Cisco Powered Network
• CIS — Computer and Information Science
• IAT — Integrated Access Terminal
• VG — Voice Grade
• ISO — Independent System Operator (US) (see also TSO) Responsible for grid management, but does not own assets. (electricity)
• AFOSR — Air Force Office Of Scientific Research(USA)

• SD — Speed Dial
• BSS — Base Station System
• NREN — National Research and Education Network
• SOS — Save Our Souls (Help!)
• NAT — Network Address Translation
• SSRC — Synchronization Source
• P — Priority
• SNA — System Network Architecture
• OTDOA — Observed Time Difference of Arrival
• DDCMP — Digital Data Communications Message Protocol
• RCC — Radio Common Carrier
• CONUS — Contiguous United States
• CE — Channel Element
• SPIN — Service Provider Identification Number
• AMR — Automated meter reading also known as Automatic Meter Reading
• BNC — Bayonet Neill-Concelman
• SDM — Service Delivery Management
• TRS — Telecommunications Relay Service
• CS — Central Station
• TRS — Trunked Radio Systems
• DVB — Digital Video Broadcasting
• OT — Office of Telecommunications
• BMS — Business Management System
• IOC — Inter-Office Channel
• FTTC — Fiber To The Curb光纤到路边
• DHD — Dial Home Device
• SIL — Solid Immersion Lens
• DDU — Disk Drive Unit
• BMEWS — Ballistic Missile Early Warning System (bee-mews)
• RNX — Restricted Numeric eXchange
• RISC — Reduced Instruction Set Computing
• IPS — Instructions Per Second
• FOSE — Federal Office Systems Exposition
• SITA — Société Internationale de Télécommunications Aéronautiques
• TXM — Transmission X-ray Microscope
• SYM — Symmetric
• AIF — Audio Interchange Format
• OXCO — Oven-Controlled Crystal Oscillator
• T — Temperature
• DDD — Direct Distance Dialing
• DUA — Directory User Agent
• TFTP — Trivial File Transfer Protocol (ATM)
• DGPT — Directorate General of Posts and Telecommunications
• RACH — Random Access Channel
• WE — Western Electric
• SDU — Signal Distribution Unit
• DSN — Defense Switched Network
• IMP — Interface Message Processor
• AP — Action Point
• SSM — Spread Spectrum Modulation

• MH — Message Handler
• TSO — Telecommunications Service Order
• DM — Domain Model
• BELLCORE — Bell Communications Research, Inc.
• BSI — British Standards Institution
• SCU — System Control Unit
• C — Collector
• S/D — Source/Drain
• VTS — Vessel Traffic Service
• BLOS — Beyond Line-Of-Sight
• FRAD — Frame Relay Access Device
• RPV — Remotely Piloted Vehicle
• OOP — Object-Oriented Programming
• TAM — Telephone Answering Machine
• RAU — Radio Access Unit (Army)
• PTP — Point to Point Transmission Service (electricity)
• WORM — Write-Once, Read-Many
• COO — Cell of Origin
• OSP — Outside Plant
• APDU — Application Protocol Data Units
• WDN — Wireless Developer Network
• SN — Stock Number
• SN — Service Number
• PUK — PIN (Personal Identification Number) Unlocking Key
• ACC — Area Control Center
• CGA — Color Graphics Adapter
• DISN — Defense Information Systems Network
• YABA — Yet Another Bloody Acronym
• RMS — Resource Management System
• GBT — Ground Based Tower
• OD — Outside Diameter
• SAF — System Access Fee
• OSS — Operations Support System
• EULA — End User License Agreement (usually in reference to software)
• SDP — Software Development Plan
• IRTF — Internet Research Task Force
• ACP — Access Control Point
• LSI — Large Scale Integration -> VLSI
• WAYP — White and Yellow Pages
• SM — Service Module
• DCS — Data Collection System (NOAA Polar Orbiting Satellites)
• CT — Computer Terminal
• RTC — Real-Time Control
• TAX — Trunk Automatic Exchange
• AVR — Automated Voice Response
• DW — Deep Water
• CRBT — Caller Ring Back Tone
• SRR — Search and Rescue Region
• V — Variable
• CNG — comfort noise generation

• AWT — Agence Wallonne des Télécommunications
• CIP — Carrier Identification Parameter
• PAM — Payload Assist Module
• SMDS — Switched Multimegabit Data Service (ATM)
• TUR — Trunk Utilization Report
• NAK — Negative Acknowledge
• SPA — Special Prorate Agreement
• EMR — Electromechanical Relay
• QI — Quality Indicator
• FXS — Foreign Exchange Subscriber
• RJE — Remote Job Entry
• B2B — Business-to-Business
• FGA — Feature Group A
• RAU — Remote Access Unit
• ASD — Alternative Service Delivery
• LT — Line Termination
• TC — Transmission Convergence (ATM)
• DPCM — differential pulse code modulation
• DC — Device Control
• JDK — Java Development Kit
• SSM — Synchronization Status Message
• EIR — Equipment Identity Register
• 4GL — Fourth-Generation Language
• MA — Maintenance Action
• WWAN — wireless wide-area network
• CCIR — International Radio Consultative Committee (French Acronym)
• DL — Definition List
• ACSE — Association Control Service Element
• CMOS — Complementary Metal Oxide Semiconductors
• ANSI-41 — ANSI standard for mobile management
• LIU — Line Interface Unit
• VLAN — Virtual Local Area Network
• TOP — technical/office protocol
• FOD — Fax on Demand
• BLER — Block Error Rate
• HSCSD — High-Speed Circuit-Switched Data
• MCP — Microsoft Certified Professional
• ST — Such That
• POP — Post Office Protocol
• SISIR — Singapore Institute of Standards and Industrial Research
• RSL — Restricted Service License
• GSM — Groupe Speciale Mobile
• MSRN — Mobile Station Roaming Number
• DSI — Digital Speech Interpolation
• SMI — Structure of Management Information
• UMA — Unlicensed Mobile Access
• FEA — Finite Element Analysis
• EBCDIC — Extended Binary-Coded Decimal Interchange Code
• DSCP — Differentiated Services Code Point
• MPI — Minimum Picture Interval

• UART — Universal Asynchronous Receiver/Transmitter
• CIRC — Cross-Interleaved Reed-Solomon Code
• 2G — Second Generation Wireless Systems
• DRFM — Digital Radio-Frequency Memory
• DTI — Digital Trunk Interface
• ABM — Asynchronous Balanced Mode
• BOSS — Binary Object Storage System
• VHSIC — Very High-Speed Integrated Circuit
• SDSL — Symmetric Digital Subscriber Line
• IPCP — Internet Protocol Control Protocol
• SONET — Synchronous Optical Network
• LDN — Local Directory Number
• NF — Noise Factor
• CLETS — California Law Enforcement Telecommunication System
• SVC — Switched Virtual Circuit (ATM)
• DDI — Direct Dialing Incoming
• TIFF — Tag Image File Format
• OML — Object Model Library
• MLM — Multi-Longitudinal Mode
• CMIP — Common Management Information Protocol (ATM)
• MC — Maintenance Control
• DCA — Dynamic Channel Assignment
• SMPTE — Society of Motion Picture and Television Engineers, Inc.
• FSAI — Fiber Serving Area Interface
• LOO — Likelihood of Occurrence
• IAD — Integrated Access Device
• NAS — Network-Attached Storage
• AOS — Alternate Operator Service
• LDP — Label Distribution Protocol
• EA — Extended Address Field Bit
• BAN — Building Area Network
• ALB — Analog Loopback
• RSS — Radio Service Software (Motorola)
• CPG — Converged Packet Gateway
• SDP — Session Description Protocol
• CLK — Clock
• MSW — Most Significant Word
• WAR — Weekly Activity Report
• CIP — Channel Interface Processor
• FTAM — File Transfer Access and Management
• DFG — difference-frequency generation
• NII — National Information Infrastructure (USA)
• IG — Interface Group
• EMI — Electro-Magnetic Interference
• FDD — Frequency Division Duplex
• VRML — Virtual Reality Modeling Language
• ET — Electronic Transmission
• NTDS — Naval Tactical Data System
• ASYNC — Asynchronous
• 3-D — 3-Dimensional

• TTL — ToS and Time-to-Live
• PMT — Program Management Team
• IPM — Inches Per Minute
• SIM — Subscriber Identification Module
• ETSI — European Telecommunications Standard Institute
• ISG — Information Systems Group
• DVMRP — Distance Vector Multicast Routing Protocol
• CFNRY — Call Forwarding on No Reply
• TOMS — Total Ozone Mapping Spectrometer (satellite Instrument)
• HSPA — High Speed Packet Access
• ODS — Operational Data Store (knowledge management)
• CMRS — Commercial Mobile Radio Service
• EBIC — Electron Beam Induced Current
• AUI — Attachment Unit Interface
• CHTML — Compact Hypertext Markup Language
• RSS — root-sum-square
• LIF — Logical Interchange Format
• CND — Calling Number Display
• EDFA — Erbium-Doped Fiber Amplifier
• CAVE — Cellular Authentication and Voice Encryption Algorithm
• SWBD — Switchboard
• DTAP — Direct Transfer Application Process
• LRC — Longitudinal Redundancy Check
• ILEC — Incumbent Local Exchange Carrier
• EMS — Enhanced Messaging Service
• EBS — Electron Bombarded Silicon
• COT — Central Office Terminal
• FMS — Fraud Management System
• RXQUAL — Received Signal Quality
• CDM — Conceptual Data Model
• ABBR — Abbreviation
• FGD — Feature Group D
• MHO — My Humble Opinion
• DM — Differential Mode
• SCPC — single channel per carrier
• OBC — Onboard Computer
• LAG — Link Aggregation Group
• WSDL — Web Services Description Language
• EDC — Electronic Dispersion Compensator
• CAC — Connection Admission Control (Asynchronous Transfer Mode)
• IEEE-CS — Institute of Electrical and Electronics Engineers Computer Society
• LCR — Least Cost Routing
• ACA — Adaptive Channel Allocation
• GI — Graded-Index
• CRTS — Cellular Radio Telecommunications Service
• ARSR — Air Route Surveillance Radar
• WDA — Wireless Digital Assistant
• CC — Country Code
• IPVX — Internet Protocol version X
• 4 GIG — 4 Giga Intellectual Gadget

• FNN — Full National Number
• ADC — Access Deficit Charge
• MA — Message Analysis
• INE — Intelligent Network Element
• ASAR — Advanced Synthetic Aperture Radar 
• REA — Rural Electrification Administration (US)
• 4G — Fourth Generation Wireless Systems
• PNP — Plug-and-Play
• IPLC — International Private Leased Circuit
• LPD — Low Probability of Detection
• FAC — Forced Authorization Code
• 3G — 3rd Generation Wireless Format
• VN — Virtual Network
• PBT — Polybutylene Terephthalate
• BOM — Bit-Oriented Message
• LANE — Local Area Network Emulation
• DPT — Dynamic Packet Transport
• ESCA — photoelectron spectroscopy for chemical analysis
• CCR — Customer Controlled Reconfiguration (Sprint)
• STN — Station
• CLDC — Connected Limited Device Configuration
• RICK — Repeater Interface Communications Kit
• OCC — Occupancy
• DLP — Data Link Processor
• VESA — Video Electronics Standards Association
• CALEA — Communications Assistance for Law Enforcement Act
• MUSIC — MUltiple SIgnal Classification
• AF — Assured Forwarding
• DACS — Digital Access Cross-connect System
• KSU — Key Service Unit
• ARM — Asynchronous Response Mode
• 4W — Four-Wire
• LS — Loop Start
• OSF — Open Software Foundation
• ASN.1 — Abstract Syntax Notation 1
• FCA — Fixed Channel Allocation
• DISA — U.S. Defense Information Systems Agency
• BSC — Bi-Synchronous Communications
• PLL — Phase Locked Loop
• FDI — Feeder Distribution Interface
• VSAM — Virtual Storage Access Method
• FECN — Forward Explicit Congestion Notification (ATM)
• CRV — Call Reference Value
• RMON — Remote Monitoring
• WCDMA — Wideband Code Division Multiple Access
• ECM — Error Correction Model
• CRB — Cramer-Rao Bound
• TEI — Terminal Endpoint Identifier
• IRF — Impulse Response Function
• ISI — Intersymbol Interference

• PARC — Palo Alto Research Center
• GBPS — Gigabits per second
• AAS — advanced automation system (FAA)
• ILD — International Long Distance
• GAN — Global Area Network
• TCP/IP — Transmission Control/Internet Protocol
• UDP — Up Down Pair
• FC — Frame Control
• VPA — Valid Peripheral Address
• AAL5 — ATM (Asynchronous Transmission Mode) Adaptation Layer 5
• CPC — Calling Party Control
• PTP — Point To point Protocol
• CTI — Computer Telephony Integration
• ALI — Automatic Location Information
• UAT — Universal Access Transceiver
• MP — Modulation Parameter
• DAC — Digital-To-Analog Converter
• ICL — Inserted Connection Loss
• REPT — Report
• LFACS — Loop Facility Assignment and Control System
• DPA — Distributed-Power Architecture
• CCCH — Common Control Channel
• RDT — Recall Dial Tone
• PACS — Personal Access Communications System
• 1-ESS — x-ESS series of Electronic Switching Systems
• AWG — arrayed waveguide grating
• INTELSAT — International Telecommunications Satellite
• RX — Receive
• ALOC — Average Length Of Call
• RDBMS — Relational Data Base Management System (Oracle)
• RDMA — Remote Direct Memory Access
• LBR — Low Bit Rate
• LSW — Least Significant Word
• IMAP — Internet Mail Access Protocol
• EVA — Electronic Video Agent
• CMA — Communications Management Association
• DARTS — Design Approach for Real-Time Systems
• CV — Coding Violation
• NDS — Novell Directory Services
• CIC — Carrier Identification Code
• SSN — Switched Service Network
• EEROM — Electronically Erasable Read-Only Memory
• BCDIC — Binary Coded Decimal Interchange Code
• STMR — Sidetone Masking Rating (telecommunications)
• SSMA — Spread-Spectrum Multiple Access
• WARC — World Administrative Radio Conference
• MAJ — Major
• SIP — Session Initiation Protocol
• CIP — Continuous Improvement Program
• ASN.1 — Abstract Syntax Notation One

• EMF — Event Management Framework
• WTS — Wireless Telecommunications Symposium
• INSAT — Indian National Satellite
• DXC — Digital Cross Connect
• PIC — Programmable Interrupt Controller
• RQMTS — Requirements
• SE — Southeast
• VPWS — Virtual Private Wire Service
• TCB — Telecommunication Certification Body
• TD — Transmit Data
• COC — Central Office Connection
• MGC — Multimedia Gateway Controller
• DNSIX — Defense Network Security Information Exchange
• RGN — Region
• TACACS — Terminal Access Controller Access Control System
• UMTS — Universal Mobile Telecommunications Service
• TDRSS — Tracking and Data Relay Satellite System
• ULL — Unbundled Local Loop
• RADIUS — Remote Authentication dial In User Service
• NCF — Network Control Facility
• 3G — Third Generation (mobile communication system)
• FOIP — Fax Over Internet Protocol
• SETI — Search for Extraterrestrial Intelligence
• ACF — Advanced Communications Function (IBM)
• RCU — Radio Control Unit
• IWF — Interworking Function
• B-CPE — Broadband Customer Premises Equipment
• BIS — Brought Into Service
• RLU — Remote Line Unit
• SRL — Singing Return Loss
• WVOIP — Wireless Voice over Internet Protocol
• WK — Week
• CPE — Customer Premise Equipment
• LIS — Lightning Imaging Sensor
• EGSM — Extended Global System for Mobile Communications
• RECON — Reconnaissance
• ASE — Application Service Element
• CNG — Fax Calling Tone
• ADCCP — Advanced Data Communication Control Procedures
• CLCC — Ceramic Leaded Chip Carrier
• W-CDMA — Wideband Code Division Multiple Access
• VCI — Virtual Channel Identifier
• CCNA — Cisco Certified Network Administrator
• MMC — Microsoft Management Console (Microsoft)
• ELFEXT — Equal-Level Far-End Cross-Talk
• LB — Local Battery
• DXF — Data Exchange Format
• PDL — Positioning Data Link
• VLSI — Very Large-Scale Integration
• ATS — Abstract Test Suite

• DTU — Data Transfer Unit
• SIMT — Système interbancaire marocain de télécompensation
• NRP — Network Resource Planning
• IR — International Roaming
• CODASYL — COnference on DAta SYstems Languages
• MSDP — Multicast Source Discovery Protocol
• SFX — Special Effects
• FMR — Follow Me Roaming
• SCR — Sustainable Cell Rate
• OMF — Object Management Framework
• PSN — Packet Switched Network
• CPAP — Customer Premises Access Profile
• LSF — Line Spread Function
• VTAM — Virtual Telecommunication Access Method
• PSDN — Public Switched Digital Network
• GRUB — Greedy Reclamation of Unused Bandwidth
• DIV — Divisionsion
• CSU — Channel Service Unit
• TACSAT — Tactical Satellite
• HTML — Hyper-Text Markup Language
• RCP — Right-Hand Circular Polarization
• FTTK — Fibre To The Kerb
• SMS — Service Management System
• WSFL — Web Services Flow Language
• TT — Text-Telephone
• ESCON — Enterprise System Connection
• DMT — Discrete Multi-Tone Technology
• LH — Link Handler
• BT — Burst Tolerance
• DOD — Direct Outward Dialing
• ESPN — Entertainment and Sports Programming Network
• FSK — Frequency Shift Keying
• CSIRO — Commonwealth Scientific and Industrial Research Organization
• VSAT — Very Small-Aperture Terminal
• DLL — Digital Local Line
• DCF — Distributed Coordination Function
• NCC — Network Control Center (GSFC)
• NCAR — National Center for Atmospheric Research (US)
• DAS — Data Acquisition System
• DLCI — data link connection identifier
• VPX — Virtual Path Cross-Connect
• L2TP — Layer 2 Tunneling Protocol
• IEEE-SA — Institute of Electrical and Electronics Engineers - Standards Association
• SN — Switching Network
• CCP — Compression Control Protocol
• DCAS — Downloadable Conditional Access System
• VOB — Voice Over Broadband
• BY — Busy
• ETN — Electronic Tandem Network
• CGI — Cell Global Identity

• MMSI — Maritime Mobile Service Identity
• DA — deca
• SS1 — Signalling System 1 (500/20 Hz tones)
• NC — Network Channel
• PIM — Protocol Independent Multicast
• TCA — Threshold Crossing Alert
• MTD — Moving Target Detection
• CTIA — Cellular Telecommunications Industry Association
• FTTP — Fiber To The Premises
• 2G — Second generation cellular
• ANC — Access Network Controller
• DQDB — Distributed Queue Dual Bus
• MR — Mobile Router
• SFN — Single Frequency Network
• CACH — Call Appearance Call Handling
• DPDT — Double-Pole Double-Throw
• FPS — Framing Pattern Sequence
• TRLR — Trailer
• F — Frequency
• ERL — Echo Return Loss
• PTT — Push to Talk Technology
• CCITT — Comit? Consultatif International T?l?graphique et T?l?phonique
• LLA — Link Level Access
• AMA — automatic message accounting
• NTU — Network Termination Unit
• TU — Transmission Unit
• YA — Yet Another
• PLCP — Physical Layer Convergence Procedure
• OMP — Open Management Platform
• SCCS — Switching Control Center System
• BSID — Base Station Identity
• UPT — Universal Personal Telecommunications
• ET — Exchange Terminal
• MITI — Ministry of International Trade and Industry
• CPOP — Circuit Precedence Over Packet data
• TELNET — Telecommunications Network Protocol
• WFA — Wait for Answer
• URN — Uniform Resource Namespace
• FCA — Free Carrier Alongside
• UIT — Union Internationale des Télécommunications
• L2F — Layer 2 Forwarding protocol
• LP — Line Pair
• FI — Format Identifier
• LRQ — Location Request
• CGI — Computer Graphics Interface
• SSAP — Source Service Access Point
• LCP — Local Control Point
• EDSX — Electronic Digital Signal Cross-Connect
• TDWR — Terminal Doppler Weather Radar
• RTB — Retransmission Buffer

• TBCD — Telephony Binary Coded Decimal
• USA — Underground Service Alert
• NCP — Network Control Program
• MFC — Multi-Frequency Code
• ADPC — Automatic Data Processing Center
• OSA — Open System Architecture
• CID — Craft Interface Device
• DE — Discard Eligibility (ATM)
• ATS — Air Traffic Services
• MMDS — Multichannel Multipoint Distribution Service
• CPH — Call Party Handling
• TBPS — Terabits Per Second
• FEM — Finite Element Method
• BAF — Bellcore AMA (Automatic Message Accounting) Format
• MTI — Moving Target Indicator
• 3G HSPA — Third-Generation High-Speed Packet Access
• CVD — Chemical Vapor Deposition
• DOCSIS — Data over Cable Service Interface Specification
• ARFA — Allied Radio Frequency Agency
• TLT — Test Loop Translator
• CAR — committed access rate
• CAM — Computer-Aided Manufacturing
• ADM — Administration Building
• DTE — Digital Terminal Equipment
• LR-WPAN — Low-Rate Wireless Personal Area Network
• RDT — Remote Digital Terminal
• MF — Multiple Frequency
• SCH — Synchronization Channel
• 3GPP — Third-Generation Partnership Project
• BUFR — Binary Universal Form for the Representation (of data)
• DICOM — Digital Imaging and Communications in Medicine
• DUV — Deep Ultraviolet
• MLA — Modern Language Association
• IV&V — independent verification and validation
• EM — Element Manager
• FIOS — Fiber Optic Services
• CLEC — Competitive Local Exchange Carrier
• NE — Network Element
• CRS — Cell Relay Service
• CTO — Commonwealth Telecommunications Organisation
• NSAP — Network Service Access Point
• DIL — Direct Inward Line
• BDE — Borland Database Engine
• GS — Ground Start
• COFA — Change Of Frame Alignment
• CTE — Computer Telephony Engineer
• BSA — Basic Service Area
• LIM — Line Isolation Monitor
• GERAN — GSM (Global System for Mobile communications) Edge Radio Access Network
• MSC — Mobile Switching Center

• RADINT — Radar Intelligence
• SCM — Single-Carrier Modulation
• DPBX — Digital Private Branch Exchange
• HFC — Hybrid Fiber Coaxial
• WNMS — Wireless Network Management System
• ESN — Electronic Serial Number
• RFR — Radio Frequency Radiation
• MFLOPS — Millions of Floating Point Operations per Second
• VISSR — visible and infrared spin scan radiometer (GOES)
• LI — Length Indicator
• PSLV — Polar Satellite Launch Vehicle (Indian Space Research Organization; India)
• VQV — Voice Quality Value
• VSM — Vestigial Sideband Modulation
• EFCI — Explicit Forward Congestion Indication (ATM)
• CON — Concentrator
• DTL — Defense Telephone Link
• RIPE NCC — Reseaux IP Europeens Network Coordination Centre
• GDK — GIMP (GNU Image Manipulation Program) Drawing Kit
• LCF — Location Confirm
• VDR — Voice Digitization Rate
• PDSO — Packet Data Security Overlay
• USF — Universal Service Fund
• BIND — Berkeley Internet Name Domain
• RP — Radio Port
• CLD — Cross-Layer Design
• TSC — Test System Controller
• ACF — Access Coordination Function
• TP — Telephone Pole
• COAM — Customer Owned And Maintained
• TPC — The Phone Company
• NT — New Technology, also Windows NT
• BATM — Basic Telecommunication Access Method
• DRQ — Disengage Request
• TM — Thematic Mapper (Landsat)
• EV — electronvolt
• PD — Pulse Duration
• 4WAI — Four-Wire Analog Interface
• CSDU — Core Service Data Unit
• BHCA — Busy Hour Call Attempts
• MMM — Mobile Media Mode
• DFE — Design For Environment
• ECS — Environmental Control System (Subsystem)
• CSR — Customer Service Report
• MTA — Message Transfer Agents (Internet)
• ATSC — Advanced Television Systems Committee
• SAT — Satellite
• MAP — Mobile Application Part
• CAPTAIN — Character And Pattern Telephone Access Information Network
• SSP — Security Service Provider
• TDR — Time-Domain Reflectometry

• DSSSL — Document Style Semantics and Specification Language
• JISC — Japanese Industrial Standards Committee
• PCCA — Portable Computer Communications Association
• CRBT — Color Ring Back Tone
• APPC — Advanced Program-to Program Communications
• CC — Composite Clock (SONET)
• PTT — Push to Talk Testing
• LRM — Long Reach Multimode
• LAPB — Link Access Protocol-Balanced
• DNC — Do Not Call
• SCR — System Change Request
• NW — North West
• CBQ — Class-Based Queuing
• MEID — Mobile Equipment Identifier
• AT — Attenuation
• VR — Virtual Router
• PJC — Pointer Justification Count
• DDU — Digital Data Unit
• PSO — Professional Services Organization
• DS-3 — Digital Signal, Level 3
• DECCO — DISA Defense Commercial Communications Office
• CERN — Conseil Europeen Pour La Recherche Nucleaire
• CDV — Cell Delay Variation(ATM)
• ALI — Automatic Location Identifier
• UBR — Unspecified Bit Rate
• VNS — Virtual Network System
• B8ZS — Binary Eight Zero Substitution
• BPSK — Binary Phase-shift Keying
• WIN — Wireless Intelligent Network
• CFOT — Certified Fiber-Optic Technician
• MGCP — Multimedia Gateway Control Protocol
• EPP — Enhanced Parallel Port (PC)
• 4WA — Four Wire Analog
• DAC — Digital to Analog Converter-Audio
• FDOA — Frequency Difference Of Arrival
• LAAS — Local Area Augmentation System
• ENV — Environment
• TCC — Transmission Control Code
• WAE — Wireless Application Environment
• LUNT — Line Unit Network Termination
• ADPCM — Adaptive Differential Pulse Code Modulation
• FAT — Final Acceptance Testing
• UNI — User-Network Interface
• FMS — Fixed Mobile Substitution
• LIDB — Line Information DataBase
• TP — Transition Point
• BDSL — Broadband Digital Subscriber Line
• ETOC — Electronic Table of Contents
• SPID — Service Profile Identifier
• CCLC — Carrier Common Line Charge

• BWX — Broadband Wireless Exchange
• VOB — Versioned Object Base
• IPRC — Intellectual Property Rights Committee
• EIR — Excess Information Rate
• CES — Circuit Emulation Service
• CAMEL — Customized Applications for Mobile-network Enhanced Logic
• WSA — Wireless Security Auditor
• DECT — Digital Enhanced Cordless Telecommunication
• QOI — Quality of Information
• ATU-C — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Central office end
• CDA — Communications Decency Act's
• B-ISDN — Broadband ISDN
• PLE — Path Length Efficiency
• CEPT — Conférence Européenne des Administrations des Postes et des Télécommunications
• QS — Quasi-Synchronous
• LCAS — Link Capacity Adjustment Scheme
• NESC — National Electrical Safety Code
• NMC — Network Management Center
• VLF — Vertical-Laminar-Flow
• PTT — Push to Talk Taster
• DEM — Digital Elevation Model
• LN — Line
• LSAP — Link Service Access Point
• RRC — Root Raised-Cosine
• DPNSS — Digital Private Network Signaling System
• SMS — System Management Server
• IVP — Integrated Voice Protocol
• SRA — Seamless Rate Adaptation
• SAI — Serving Area Interface
• CDM — Configuration Data Manager
• CCA — Carrier-Controlled Approach
• WFG — Wireless Firewall Gateway
• S/N — Signal-to-Noise ratio
• PNP — Positive-Negative-Positive
• GMSS — Global Mobile Satellite System
• MPU — Main Processor Unit
• CASE — Computer-Aided Software Engineering
• DLU — Digital Line Unit
• DMS — Defense Messaging System
• ZCZ — Zero Correlation Zone
• TNI — Telephone Network Interface
• UCF — Unregistration Confirm
• NDIS — Network Driver Interface Specification (Microsoft Windows NT)
• HDTV — High-Definition Television
• SA — Selective Availability (on GPS transmissions)
• NPSI — Network Packet Switching Interface
• TSDU — Transport Service Data Unit
• IS 41 — Interim Standard 41 (Inter-Cellular Network Communication Protocol)
• CSR — Customer Service Request
• NLM — NetWare Loadable Module

• P2P — Person-to-Person
• VOFR — Voice Over Frame Relay
• CBMS — Computer-Based Message System
• OWS — Operator Work Station
• ALCAP — Access Link Control Application Protocol
• LMS — Location and Monitoring Service
• ECS — Encryption Control Signal
• SNIX — Single Noise Interference Xterminator
• UTP — unshielded twisted pair
• ACM — Address Complete Message
• PTO — U.S. Patent And Trademark Office
• TP — Termination Point
• UTL — Utility
• M/W — MicroWave
• TMSI — Temporary Mobile Subscriber Identity
• DDLD — Direct Dial Long Distance
• # — Number sign, octothorp; special function key
• IBSS — Independent Basic Service Set
• SDNS — Secure Data Network System
• NICT — National Institute of Information and Communications Technology
• PY — person-year
• DUN — Dial-Up Networking
• DL — Downlink Message
• RTC — Right to Carry
• TC — Technical Committee (HL7)
• SPE — Synchronous Payload Envelope
• GRX — GPRS Roaming Exchange
• BT — Back Trace
• VADB — Virtual Auto Dial Backup
• TDM — Time Division Multiplexing
• FEAC — Far End Alarm and Control
• SCORM — Shareable Content Object Reference Model
• UCM — Use Case Map
• X — X Window System
• DNA — Do Not Answer
• DOD — Dial on Demand
• GSTN — General Switched Telephone Network
• CT — Cordless Telecommunications
• STM — Synchronous Transfer Mode
• AFPS — Automatic Facility Protection Switching
• MBE — Molecular Beam Epitaxy
• 100VG — 100 Voice Grade (IEEE 802.12 AnyLAN Standard)
• ARPT — Autorité de Régulation des Postes et Télécommunications
• CIS — Center for Integrated Systems
• EA — expedited acknowledgement
• BP — Block Parity
• SAMI — Structured Adjustment & Maintenance Interface
• IDCP — Internet Device Control Protocol
• BHCC — Busy Hour Call Completions
• NWK — Network

• DCC — Digital Control Channel
• STU — Secure Telephone Unit
• ATD — Advanced Technology Demonstration
• BASIZE — Buffer Allocation Size
• LORAN — Long Range Aid to Navigation System
• CDA — Communications Decency Act of 1996
• FAW — Frame Alignment Word
• RAD — Recorded Announcement Device
• TCS — Telephony Control Specification
• DCS — Defense Communications System
• OSD — Onscreen Display
• PSK — Phase Shift Key
• SMSC — Short Message Service Center
• ADTM — Asynchronous Data Transfer Mode
• SMMR — Scanning Multichannel Microwave Radiometer
• LXT — Local Exchange Terminal
• DMT — Discrete Multi-tone Transmission
• FGDC — Federal Geographic Data Committee's
• DXI — Data Exchange Interface
• FOC — Fiber-Optic Cable
• RADARSAT — Radar Satellite
• FFH — Fast Frequency Hopping
• SAR — Segmentation and Reassembly (ATM)
• DDM — Data Distribution Manager
• N-AMPS — Narrowband Advanced Mobile Phone System
• AAL2 — ATM (Asynchronous Transmission Mode) Adaptation Layer 2
• WFA — Work Force Administration
• DPST — Double-Pole Single-Throw
• IDLC — Integrated Digital Loop Carrier
• SQL — Specified Quality Level
• ARD — Automatic Ring Down
• MTP — Message Transfer Part
• MDN — Mobile Directory Number
• LSC — Link State Control
• DDSN — Digital Derived Services Network
• QPM — QoS (Quality of Service) Policy Manager
• RPCU — Radio Port Control Unit
• BUS — Broadcast and Unknown Server
• LCGN — Logical Channel Group Number
• PCS — Personal Communications Services
• FTS — Federal Telecommunications System
• DMT — Digital-Discrete Multi-Tone
• WSP — Wireless Service Provider
• SCC — Specialized Common Carrier
• TCM — Time Compression Multiplexer
• BAOC — Barring of All Outgoing Calls supplementary service
• CSAR — Combat Search and Rescue
• TPS — Telephone Preference Service
• RDSS — Radio Determination Satellite Service
• BDFB — Battery Distribution Feeder Bay

• IDCU — Integrated Digital Carrier Unit
• SR — Slow Release
• WNAP — Wireless Network Access Point
• PUC — Public Utility Commission (electricity)
• STM — Scanning Tunneling Microscopy
• AAL — ATM (Asynchronous Transmission Mode) Adaptive Layer
• ECTF — Enterprise Computer Telephony Forum
• LEED — Low-energy Electron Diffraction
• WTP — Wireless Transaction Protocol
• CDV — Compressed Digital Video
• EST — Electroshock Therapy
• ADIF — Accounting Data Interchange Format
• LQC — Line Quality Control
• BAM — Basic Access Module
• WTNM — Working Telephone Number Management
• ANAC — An Automatic Number Announcement Circuit
• CAAS — Communications-as-a-Service
• BT — Bluetooth Tablet
• SEM — Scanning Electron Microscopes
• LSP — Label Switched Path
• AMTI — Airborne Moving Target Indicator
• ATTRA — Appropriate Technology Transfer for Rural Areas
• CDVT — Cell Delay Variation Tolerance
• BPP — Billed Party Preference
• USRT — Universal Synchronous Receiver/Transmitter
• CCSA — Common Control Switching Arrangement
• BB — Blackberry
• CNID — Calling Number Identification Display
• DMT — Discrete Multi-Tone
• PHY — Physical Layer
• NAP — Network Access Point
• BNCC — Base Network Control Center
• GOMP — Get Off My Phone
• VSC — Vertical Service Code
• BTS — Base Transceiver Station (cellular)
• PMMA — Polymethyl Methacrylate
• 3GIP — Third Generation Internet Protocol
• CM — Connection Manager
• CLP — Cell Loss Priority (ATM)
• PT — Payload Type (ATM)
• ROW — Rest Of World
• DSCS — Defense Satellite Communication System
• ETSI — European Telecommunications Standards Institute
• AAP — Alternate Access Provider
• IPXCP — Internetwork Packet Exchange Control Protocol
• NRZ — Nonreturn To Zero
• HDB3 — High-Density Bipolar Three-bit substitution
• AAV — Alternate Access Vendor
• F/W — Firmware
• GLT — Great Lakes Telecom

• AEA — American Electronics Association's
• DNI — Data Network Interface
• MEAS — Measure
• P&A — Privacy and Authentication
• BSRF — Basic System Reference Frequency
• TLP — Transmission Level Point
• * — Star, special function key
• ATCA — Advanced Telecom Computing Architecture
• ULP — Upper Layer Protocol
• FIFO — first-in, first-out
• E2E — End-to-End
• CCCI — Command, Control, Communications and Intelligence
• CDDI — Copper Distributed Data Interface
• MAG — Mobile Access Gateway
• DLT — Delete
• RM-ODP — Reference Model for Open Distributed Processing
• CSP — Converged Service Platform
• DCEF — Distributed Cisco Express Forwarding
• MSI — Maritime Safety Information
• AI — Adapter Interface
• CLOS — Clear Line Of Sight
• IXC — interexchange carrier
• RLS — Recursive Least Squares
• AB — Answer Back
• AMOLED — Active Matrix Organic Light-Emitting Diode
• DS0 — Digital Signal Zero
• CACM — Communications of the ACM
• KEK — Key Encrypting Key
• FTNS — Fixed Telecommunications Network Services
• AMTFT — Active Matrix Thin Film Transistor
• BORSCHT — Battery feed, Overvoltage protection, Ringing, Signaling, Coding, Hybrid, and Testing
• ATB — Above-Ground Telecommunications Backbone
• PFE — Power Feed Equipment
• CSTA — Computer Supported Telecommunications Applications
• NTSC — National Television Standards Committee
• OIM — Operations Interface Module
• AECT — Association for Educational Communications and Technology's
• UMTS — Universal Mobile Telecommunication System
• TP-PMD — Twisted Pair Physical Medium Dependent
• CSCW — Computer-Supported Cooperative Work
• VLR — Visitor Location Register
• OLS — Optical Line System
• VO — Voice Only
• USF — Universal Server Farm
• MCR — Minimum Cell Rate (ATM)
• CDSL — Consumer Digital Subscriber Line
• CAN — Controller Area Network
• A/D — Analog-to-Digital converter
• ZD — Zero Defects
• DBRNC — deciBel Relative to Noise in a Circuit

• ATRAC — Adaptive Transform Acoustic Coding
• SR — Scanning Radiometer
• STA — Science and Technology Agency (Japan)
• MOS — Metal Oxide Semiconductor (FET Devices)
• VCA — Voice Connecting Arrangement
• DPT — Dial Pulse Terminate
• BSS — Broadband Switching System
• EC — Equipment Controller
• FR — Functional Requirement
• BTP — Business Telecom Products, Inc.
• MEH — Mobile-Executed Handoff
• HSCSWD — High-Speed Circuit-SWitched Data
• SINAD — SIgnal-to-(Noise And Distortion) ratio
• TRIG — Trigger
• DUV — Data-Under-Voice
• ESA — Enhanced Subscriber Authentication
• DF — Direction Finding or Finder
• TP — Transaction Processor
• TRX — Tandem Repeater eXchange
• ETOM — Enhanced Telecom Operations Map
• COBE — Corporate Owned Business Only
• DNU — Do Not Use
• VCR — Videocassette Recorder
• Z — Zulu Time
• AFRINIC — African Network Information Centre
• NFR — Near-Field Recording
• GFC — Generic Flow Control (ATM)
• VFL — Visual Fault Locator
• RNR — Receive Not Ready
• OOK — On/Off Keying
• GTP — GPRS (General Packet Radio Service) Tunneling Protocol
• MBS — Maximum Burst Size (ATM)
• MILNET — Military Network
• HPN — Home Phone Network
• LULT — Line Unit/Line Termination
• STD — Secondary Telecom District
• CALS — Computer Aided Acquisition and Logistic Support
• CCSS6 — Common Channel Signaling System # 6
• TD-CDMA — Time Division - Code Division Multiple Access
• LSMS — Local Service Management System
• BIC — Bus Interface Controller
• LVM — Line Verification Module
• DACS — Digital Access and Cross-Connect System
• FLL — Fixed-Loss Loop
• EVC — Electronic Voucher Charging
• RCT — remote Control Terminal
• DSU — Digital Service Unit
• GOSIP — Government Open Systems Interconnection Profile
• JSC — Joint Scientific Committee (ICSU, WCRP, and WMO)
• DOITT — Department of Information Technology and Telecommunications

• KSPS — KiloSymbols Per Second
• SCE — Service Creation Environment
• VCC — Voice Call Continuity
• AGCH — Access Grant Channel
• LMDS — Local Multipoint Distribution Service
• CAS — Column Address Strobe
• LMT — Lightwave Microcell Transceiver
• NEMP — Nuclear Electromagnetic Pulse
• CCH — Common Channel Handler
• IMPI — IP (Internet Protocol) Multimedia Private Identity
• DLT — Digital Line Termination
• RADSL — Rate Adaptive Digital Subscriber Line
• BCSM — Basic Call State Model
• BHA — Busy Hour Attempts
• ATU-R — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Remote terminal end
• IBS — In-Building Solutions
• FRF-LMI — Frame Relay Forum - Local Management Interface
• PLCP — Physical Layer Convergence Protocol (ATM)
• DE — Discard Eligible
• ESG — Enhanced Service Gateway
• KTS — Key Telephone System
• GOS — Gerry Otis Simpson
• VAD — Voice Activity Detection
• GTB — Global Telecom Brokers
• AIS-L — Alarm Indication Signal - Line
• PSQM — Perceptual Speech Quality Measure
• PMOS — P-channel Metal Oxide Semiconductor
• NCOS — Network Class Of Service
• LDI — Long Distance Interconnect
• CEE — Communaut? Economique Europ?enne
• FIRST — Forum of Incident Response and Security Teams (CERT)
• IVN — Interactive Video Network
• UIH — Unnumbered Information with Header check
• LOB — Line Of Bearing/Balance
• PTT — Post Telegraph and Telecommunications
• PSN — Public Switched Network
• CD — Committee Draft
• LSI — Large-Scale Integration
• VPC — Virtual Path Connection (ATM)
• PTCL — Pakistan Telecommunication Company Ltd
• AAS — Automatic Announcement Subsystem
• OCI — object code insertion
• SAPI — Service Access Point Identifier
• PMT — Photo Multiplier Tube
• LZ — Lempel-Ziv compression algorithm
• D3 — Digital channel bank, Third generation
• DTU — Date/Time Update
• SDN — Software Defined Network
• GSM — Global System for Mobile telecommunications
• DTR — Down-Time Ratio

• ESM — electronic support measure
• MAU — Multistation Access Unit
• WAW — Wide Area Wireless
• DLE — Digital Local Exchange
• SDSL — Symmetrical Digital Subscriber Line
• TSI — time-slot interchange
• PM — Processable Mode
• DTS — Digital Terminal Systems
• SPI — Security Parameters Index
• ECC — Emergency Communications Center
• ACU — Automatic Calling Unit
• CS — Connection Segment
• RBS — Robbed Bit Signaling
• MB — Measured Business
• FD — Full Duplex
• COP — Character Oriented Protocol
• PTM — Packet Transport Mode
• CPT — Cellular Paging Teleservice
• BABT — British Approvals Board for Telecommunications
• DAF — Directory Access Function
• BCIX — Berlin Commercial Internet Exchange
• TASI — Time Assigned Speech Interpolation
• TOC — Telecommunication Operations Center
• ILETS — International Law Enforcement Telecommunications Seminar
• CU — Cooling Unit
• 3GSM — Third-generation Global System for Mobile (communications)
• MERIS — medium-resolution imaging spectrometer
• ANT — ADSL Network Terminator
• NMS — NetWare Management System
• JDC — Japan Digital Cellular
• TED — Triteal Enterprise Desktop
• MTS — Message Transmission Subsystem
• MRT — Medical Response Team
• WBMP — Wireless Bitmap
• XWI — XML (extensible markup language) for Wireless Images
• SMU — Service Management Unit
• AFI — Authority and Format Identifier
• BRAN — Broadband Radio Access Network
• SS7 — Signaling System 7
• LAT — Local Area Transport (network)
• AEIMP — Apple Event Interprocess Messaging Protocol
• TWX — Teletypewriter Exchange (Telex)
• CMT — Commercial Metering Transponder
• SVI — Service Interception
• CCR — Current Cell Rate (ATMF)
• C² — Command and Control
• WTL — Wireless Transport Layer
• FEBE — Far End Block Error (SONET)
• PNM — Pulse Number Modulation
• WDSL — Wireless Digital Subscriber Line

• SPT — System Page Table
• VGF — Voice Grade Facility
• ADM 3X — DS3 Add-Drop Multiplex
• TTC — Telemetry Telecommand and Control
• QPA — Quality Performance Analysis
• CVT — Circuit Validation Test
• MAC — Message Authenticity Check
• ATIS — Automatic Transmitter Identification System
• EC-N — Electrical Carrier (n=a number, e.g., EC-4)
• SMT — station management (protocol)
• NSN — National Significant Number
• AIS-V — Alarm Indication Signal - Virtual
• EC — Entropy Coding
• FPLMTS — Future Public Land Mobile Telecommunications System
• LFTYR — Ley Federal de Telecomunicaciones y Radiodifusión
• LOP-P — Loss Of Pointer - Path
• AMP — amplifier / amplification
• E — Exchange
• UMTS — Universal Mobile Telecommunications Standard
• ISC — International Switching Center
• WFT — Wireline Formation Test
• TPF — Transmission Priority Field
• IOC — Interoffice Channel
• AIU — Analog Interface Unit
• ACMA — Atlantic Cable Maintenance Agreement
• TSR — Terabit Switch/Router
• ZBTSI — Zero Byte Time Slot Interchange
• ALT — Automatic Link Transfer
• ISD — International Subscriber Dialling
• AQP — Association for Quality and Participation
• MDCP — Media Device Control Protocol
• AAV — Alternative Access Vendor
• UDT — Unreliable Data Transfer
• IMTS — Improved Mobile Telephone Service
• SIGTRAN — Signaling Transport
• CLASS — Cell Level ATM (Asynchronous Transfer Mode) Services Simulator
• EGPRS — Enhanced General Packet Radio Service
• ISSI — Inter-Switching System Interface
• DACS — Digital Access Carrier System
• TARP — Target Identifier Address Resolution Protocol
• VAN — Value-Added Network
• SIO — Service Information Octet
• MBMS — Multimedia Broadcast/Multicast Service
• AA — Auto-Answer
• EC — Echo Cancelling
• BSC — Base Station Controller
• MIS — Marketing Intelligence System
• RYP — Russian Yellow Pages
• RSN — Regional Service Network
• BC — Basic Call

• PTI — Payload Type Indicator
• ANSI — Advanced Network Signaling Input
• NTE — Network Terminating Equipment
• SDHLR — Super-Distributed Home Location Register
• QOD — Quality of Data
• GOSIP — Government Open System Interconnection Profile
• PTE — Path Terminating Equipment (SONET)
• OID — Object Interaction Diagram
• EF&I — Engineering, Furnishing and Installation
• DDS — Dataphone Digital Service (AT&T)
• TSGR — Transport System Generic Requirements
• CCITT — Comite Consultatif International Telegraphique et Telephonique (now ITU-T)
• NSE — Network Software Environment
• DLC — Digital Leased Circuit
• BCS — British Computer Society
• NAM — Number Assignment Module
• USPI — Universal Serial Phone Interface
• MIN — Mobile Identification Number
• EADAS — Engineering and Administrative Data Acquisition System
• SR — Service Request
• ECDIS — Electronic Chart Display Information System
• CLI — Calling Line Identification
• CDPD — Cellular Digital Packet Data
• DAS — Distributed Antenna System
• BAN — Billing Account Number
• MO — Magneto-optic
• WUP — Wired Up Privacy
• LCU — Line Control Unit
• MEECN — Minimum Essential Emergency Communication Network
• DOR — Detailed Outage Report
• NARC — Non-Automatic Relay Center
• DMNG — Digital Mobile News Gathering
• ATMS — automatic transmission measuring system
• SLIC — Subscriber Loop Interface Circuit
• SS6 — Signalling System 6
• WRED — Weighted Random Early Detection
• RLC — Radio Link Control
• CPN — Customer Premise Network
• ARCNET — Attached Resource Computer Network
• DCO — Dial Central Office
• MRCA — Most Recent Common Ancestor
• NICAD — Nickel Cadmium
• CEPT — Conference of European Posts and Telecommunications
• ACEK — Authentication Encryption Key
• BSVCI — Broadcast Signaling Virtual Channel Identifier
• DORA — EV-DO (EVolution-Data Optimized) standard Revision A
• WPKI — Wireless Public Key Infrastructure
• APR — Alarm Processing Remote
• COI — Community of Interest
• IOS — Internet Over Satellite

• SMDS — Switched Multi-megabit Data Service
• SASL — Simple Authentication and Security Layer
• RS-422 — Recommended Standard 422 (ANSI/EIA standard for transmitting serial data)
• LEC — Liquid Encapsulated Czochralski
• INAP — Intelligent Network Application Part
• MP — Master Processor
• AVT — Audio Visual Telecommunications
• NIMH — Nickel-Metal Hydride
• MCPC — Multiple Channels Per Carrier
• DMB — Disconnect and Make Busy
• RTFM — Read The Friendly Manual
• LQR — Line Quality Report
• HUMAN — High-speed Unlicensed Metropolitan Area Network
• DMI — Desktop Management Interface (computing)
• PCIA — Personal Communications Industry Association
• ASAS — All-Source Analysis System
• CCC — CDMA Cluster Controller
• ADTS — Ameritech Digital Transport Service
• RLA — Received Level Average
• HU — Hook Up
• LCU — Lightweight Computer Unit
• FUD — Fair Use Doctrine
• PROV — Provisioning
• AH — Authentication Header
• TRCSL — Telecommunications Regulatory Commission of Sri Lanka
• TACSIM — Tactical Simulation (Simulator)
• IPOATM — Internet Protocol over ATM
• TRANS — Transaction
• WPBX — Wireless Private Branch Exchange
• ISP — International Signaling Point
• MQFP — Metric Quad Flat Pack
• BHP — Burst Header Packet
• NAU — Network Addressable Unit
• CFR-47 — Code of Federal Regulations Title 47 (FCC)
• SNI — Service Node Interface
• ACA — Automatic Circuit Assurance
• CALA — Customer Address Location Area
• TACS — Total Access Cellular System
• V — Vector
• FOE — Fiber Optic Equipment
• SM OFC — Single-Mode Optical Fiber Cable
• CQ — Communications Quality
• FEBE-I — Far End Block Error count - Interleaved data
• CSAA — Central Service Area Authority
• LRF — Laser Range Finder
• IPC — Initial Paging Channel
• JMA — Japanese Meteorological Agency
• CTIT — College of Telecommunications and Information Technology
• DSP — Data Service Provider
• LTU — Line Termination Unit

• DCS — Digital Cross-connect Switch
• SRS — Supported Residential Services
• RCF — Remote Call Forwarding
• BONDING — Bandwidth On Demand Interoperability Group
• VCT — Variable Cam Timing
• SGSN — Serving GPRS (General Packet Radio Service) Support Node
• LMS — Local Measured Service
• FWS — Fixed Wireless Services
• DOV — Data-Over-Voice
• SLIP — Serial Line Internet Protocol
• NSEP — National Security Emergency Preparedness
• AIS-P — Alarm Indication Signal - Path
• CLF — Carrier Line Failure
• WCMP — Wireless Control Message Protocol
• TAE — Terminal Adapter Equipment
• CATI — Computer-Assisted Telephone Interviewing
• AFIPS — American Federation of Information Processing Societies
• MAPDU — Management Application Protocol Data Unit
• EEHO — Either End Hop Off
• JWG — Joint Working Groupof
• GEO — Geostationary Earth Orbit
• SHR — Self-Healing Ring
• FOTS — Fiber Optical Transmission System
• LSAP — Link Layer Service Access Point
• CSP — Continuous Speech Processing
• WAAS — Wide Area Augmentation System
• RAI — remote alarm indication
• CTTC — Centre Tecnològic de Telecomunicacions de Catalunya
• CIPOA — Classical Internet Protocol over ATM (Asynchronous Transfer Mode)
• FEBE-F — Far End Block Error count - Fast data
• CLIP — Caller Line Identification Presentation
• BFS — Broadcast File System
• APS — Advanced Power System
• SDCCH — Standalone Dedicated Control Channel
• ROSE — Remote Operations Service Element
• WAWS — Washington Area Wideband System
• TFL — Telecom Fiji Limited
• ITA — Illinois Telecommunications Association
• MMC — Minimum Monthly Charge
• DACS — Digital Access Cross-Connect Switch
• TEM — Transmission Electron Microscope
• WAR — Wireless Access Revolution
• MITS — Metaphors for Integrated Telecommunications Services
• TCL — Transverse Conversion Loss
• ESP — Essential Service Protection
• VHM — Voice Health Monitor
• OST — Office of Science and Technology
• PAGCH — Paging and Access Grant Channel
• VGC — Voice Grade Channel
• AEE — Agent Execution Environment

• EMV — EuroPay, MasterCard, Visa
• LRB — Loop Reverse Battery
• SMAS — Service Management System
• SSTC — Subsystem Status Test Control
• TSC — Technical Standards Committee
• SYSADM — System Administrator
• BPOP — Building Point of Presence
• SEM — Sionscanning Electron Microscopy
• BTL — Bell Telephone Laboratories, Inc.
• DCSS — Digital Cross-connect Systems
• CAE — Common Application Environment
• MMS — Multimedia Message Service
• RDI-L — Remote Defect Indicator - Loop
• NMC — Nortel Matra Cellular
• DS-1 — Digital Signal, Level 1
• CYTA — Cyprus Telecommunications Authority
• 4G — Fourth Generation
• PNE — Path Number Efficiency
• HTO — Hellenic Telecommunications Organisation
• NSDI — National Spatial Data Infrastructure
• ACNA — Access Customer Name Abbreviation
• CAL — Customer Access Line
• GTM — Go to Meeting
• PWM — Pulse width modulation
• E-TDMA — Expanded Time Division Multiple Access
• CPS — Customer Premises System (Bellcore)
• FRAD — Frame Relay Assembler/Disassembler
• MNP — Mobile Number Portability
• TJB — Telephone Junction Box
• ADTS — Automated Digital Terminal System
• DFRI — Datacom Reference Frame Input
• NMC — Network Model Coverage
• CD-ROM — Compact Disk-Read-Only Memory
• DCA — Distributed Communications Architecture
• O — objective
• UTRAN — UMTS (Universal Mobile Telecommunication System) Terrestrial Radio Access Network
• DCB — Digital Channel Bank (Sprint)
• CT — Control terminal
• AL — Alignment
• CM — Common Mode
• ACL — Asynchronous Connection-less Link
• EC — Enhanced Cellular
• SAM — Service Access Multiplexer
• GTXC — Global Telephone Exchange Carrier
• WLNP — Wireless Local Number Portability
• VC — Virtual Circuit (ATM)
• IR — Information Request
• XC — Cross-Connect
• QEDI — Quod Erat Demonstrandum
• OC-1 — Optical Carrier Signal, Level 1

• DORK — Disciples Of The Righteous King
• FECC-F — Forward Error Correction Count - Fast data
• WIS — WAN (Wide Area Network) Interface Sublayer
• IPR — Intellectual Property Right
• SSU — Synchronization Supply Unit
• TSD — Type Specific Driver
• SES — Scientific and Engineering Software
• TWL — Leased Teletypewriter Service
• RCMAC — Recent Change Memory Administration Center
• QOTS — Quality Of Telephone Services
• A/C — Air Conditioner
• PRM — Performance Report Message
• OODBMS — Object-Oriented Database Management Systems
• IDEN — Integrated Dispatch Enhanced Network
• DBF — Digital Beam-Forming
• MNOS — Metal-nitride-oxide Semiconductor
• BIOS — Basic Input-Output System
• TON — IEEE/ACM Transactions On Networking
• XRF — X-Ray Fluorescence
• CSI — Clearing Subnetwork Identification
• SGCP — Simple Gateway Control Protocol
• BUS — Business Units
• CFNA — Call Forwarding No Answer
• WDMW — Web Directory for Mobile and Wireless
• SMDR — station message detail recording
• AARQ — A-Associate Request
• DRTT — Dial Repeating Tie Trunk
• IRLAP — InfraRed Link Access Protocol
• AS — Active Service
• SMG — Super Master Group
• FESS — Flywheel Energy Storage System
• DFT — Draft Tax Forms
• CMOS — Cellular Management Operation System
• RANAP — Radio Access Network Application Part
• ANS — Advanced Network Services
• MC-SS — Multi-Carrier Spread Spectrum
• ACRE — Authorization and Call Routing Equipment
• INMS — Integrated Network Management System
• MED — Manipulative Electronic Deception
• HQGSM — High-Quality Global System for Mobile communications
• RFI — Remote File Inquiry
• APS — American Protective Services
• RBT — Ring Back Tone
• DISA — Direct Inward Switch Access
• HEC — Header Error Control
• ML-PPP — Multilink Point-to-Point Protocol
• ATR — Advanced Telecommunications Research Institute
• PTM — Point-To-Multipoint
• MSG — Management Steering Group
• DEO — Digital End Office

• FDMMA — Frequency Division Multiplexing Multiple Access
• CMAS — Cellular Management System
• EDT — European Deaf Telephone
• ICI — Interexchange Carrier Interface
• WDF — Wireless Data Forum
• DDSD — Delay Dial Start Dial
• DTW — Dynamic Time Warping
• ISMI — International mobile subscriber identity
• UMTS — Universal Mobile Telecommunication Services
• EKTS — Electronic Key Telephone Set
• ICLD — Inter-Channel Level Difference
• DTV — Digital Television
• DPDCH — Dedicated Physical Data Channel
• BTO — Betts Telecom Oklahoma
• TOMS — Telecom Operations Management System
• BSSMAP — Base Station System Management Application Part
• MVDS — Microwave Video Distribution System
• WEDE — Wireless Enterprise Delivery Environment
• DRTL — Dial Repeating Tie Line
• ASC — Available Spare Capacity
• SCO — Synchronous Connection Oriented
• EDGE — Enhanced Data for GSM (Global System for Mobile communication) Evolution
• RCQS — Roaming Call Quality Sensor
• ICTA — Idaho Cable Telecommunications Association
• IRAC — Interdepartment Radio Advisory Committee
• ASP — Active Signaling Protocol
• MRVT — MTP Routing Verification Test
• UDC — Universal Digital Channel
• DECT — Digital Enhance Cordless Telecommunications
• 800 — Freephone
• WGX — Wireless Gateway Switch
• ATIS — Alliance for Telecommunications Industry Solutions
• DCMES — Dublin Core Metadata Element Set
• ESF — Extended Super Frame (ATM)
• CNE — Certified Novell Engineer
• UPC — Usage Parameter Control
• RSL — Request and Status Links
• ADM — Administration, Office of
• SLC — Service Level Contract
• AUSPI — Association of Unified Telecom Service Providers of India
• UTP — Universal Transmission Protocol
• TRAC — Totally Reconfigurable Analog Circuit
• ELEC — Enterprise Local Exchange Carrier
• ALC — Automatic Line Controller
• IPCU — iPhone Configuration Utility
• CSL — component sublayer
• RTU — Right to Use
• ATL — Advanced Technology Laboratory
• M2M — Multipoint-to-Multipoint
• CONS — Connection-oriented Network Services

• ATACS — Army Tactical Communications System
• MOC — Maintenance and Operations Console
• RCR — Research and Development Center for Radio Systems
• CD ROM — Compact Disc Read-Only Memory
• TCAM — Telecommunications Access Method
• BANC — Broadband Access Network Coordination
• YIP — Your Internet Phone
• TPSP — Third Party Service Provider
• HUP — Hook-UP
• NECA — National Exchange Carrier Association
• TX — Transmit
• PSC — Picture Start Code
• BFW — Broadband Fixed Wireless
• NANP — North American Numbering Plan