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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
• DWDM — Dense Wavelength Division Multiplexing
• DOE — Distributed Object Environment
• LAN — Local Area Network
• EBITDA — Earnings before Interest, Taxes, Depreciation and Amortization
• SYN — Synchronous
• ECG — Electrocardiogram
• GFSK — Gaussian Frequency Shift Keying
• CT — Computed Tomography
• ETA — Estimated Time of Arrival
• CSR — Customer Service Representative
• CSMA/CA — Carrier Sense Multiple Access/Collision Avoidance
• CSMA/CD — Carrier Sense Multiple Access with Collision Detection
• APR — Annual Percentage Rate
• BRDF — Bidirectional Reflectance Distribution Function
• CONG — Congestion message
• CSMA/CD — Carrier sense multiple access / collision detection
• YMMV — Your Mileage May Vary
• CSMA — Carrier Sense Multiple Access
• XML — Extensible Markup Language
• IAMAI — Internet and Mobile Association of India
• ROM — Read-Only Memory
• ISAR — Inverse Synthetic-Aperture Radar
• IQ — Intelligence Quotient
• YTD — Year To Date
• RDF — Resource Description Framework
• FTP — File Transfer Protocol
• YGWYPF — You Get What You Pay For
• DAM — Diagnostic Acceptability Measure
• ATOM — Any Transport over MPLS (Multi-Protocol Label Switching)
• OIC — Oh I See
• D-H — Diffie-Hellman
• MLS — Microwave Landing System
• X-BAR — Crossbar telephone exchange
• RAEX — Roaming Agreement EXchange
• S-BCCH — Short Message Service Broadcast Control Channel
• ADM — Add-Drop Multiplexer
• XA-FR — Exchange Access Frame Relay
• LASER — Light Amplification By Stimulated Emission Of Radiation (cf. Maser)
• FDIC — Federal Deposit Insurance Corporation
• MAN — Metropolitan Area Network
• X-OFF — Transmitter Off
• X-ON — Transmitter On
• DWDM — Dense Wavelength-Division Multiplexing
• ASAP — As Soon As Possible (pronounced AY-sap)
• S X S — Step-by-Step

• ISO — In Search Of
• ANSI — American National Standards Institute, Inc.
• UAX 14 — Unit Automatic eXchange type 14
• IT — Information Technology
• ZDBOP — Ziff-Davis Benchmark Operation
• VIP — Very Important Person
• BBS — Bulletin Board Service
• CPU — Central Processing Unit
• C-NBAP — Common Node B Application Part
• WACN ID — Wide Area Communications Network IDentifier
• UK — United Kingdom of Great Britain and Northern Ireland
• LED — Light-Emitting Diode
• SABGW — System Architecture Evolution Gateway
• B-ICI — Broadband Inter-Carrier Interface
• DSC — Differential Scanning Calorimetry
• CPE — Customer Premises Equipment
• F2F — Face To Face (also Meeting In Person)
• A-KEY — Authentication key
• AUP — Acceptable Use Policy
• T-IC — T-interConnect
• BPM — Beats Per Minute
• IRC — Internet Relay Chat
• OEM — Original Equipment Manufacturer (usually in reference to car parts)
• I.LINK — IEEE 1394, High Performance Serial Bus, implementation
• M-CSI — Mobility management CAMEL (Customized Applications for Mobile network Enhanced Logic) Subscription Information
• VC-ATOD — Virtual Clearinghouse on Alcohol, Tobacco and Other Drugs
• H323 — ANSI standard for format over IP
• RF — Radio Frequency
• OC-9 — Optical Carrier Signal, Level 9
• TEMIP — Telecommunications Management Information Platform
• BTW — By The Way
• E-LEAD — Ear Lead
• DND — Do Not Disturb
• KBYTE — Kilobyte (103)
• OC-18 — Optical Carrier Signal, Level 18
• T-CARRIER — Trunk Carrier
• WWW — World Wide Web
• D-NBAP — Dedicated Node B Application Part
• CDR — Critical Design Review
• RFQ — Request For Quotation
• OC-256 — Optical Carrier Signal, Level 256
• DAHDI — Digium/Asterisk Hardware Device Interface
• DBORS — Data Base of Records
• DAC — Discretionary Access Control
• FEMA — Federal Emergency Management Agency
• ECU — Electronic Control Unit
• BVR — Beyond Visual Range
• VAZO — Violating All-Zero Octet
• LCD — Liquid Crystal Display
• TNYWR — The Number You Will Receive

• QC — Quality Control
• WTG — Way To Go
• ISO — International Organization for Standardization
• IP — Internet Protocol
• AFAIK — As Far As I Know
• PDR — Preliminary Design Review
• CUG — Closed User Group
• EDI — Electronic Data Interchange
• CSA — Canadian Space Agency
• C4I — Command, Control, Communications, Computers, & Intelligence
• EAP — Employee Assistance Program
• C³CM — Command, Control and Communications Countermeasures
• GSM — Global System for Mobile Communications
• AC — Alternating Current
• SAR — Search And Rescue
• FET — Field Effect Transistor
• COB — close of business (End of duty day)
• IRL — In Real Life
• ATM — Automatic Teller Machine
• DSCP — Differentiated Services Control Point
• ESA — European Space Agency
• CCB — Change Control Board
• UDP — User Datagram Protocol (FDDI related)
• ACC — Adaptive Cruise Control
• POC — Point Of Contact
• PSK — phase-shift keying
• PPM — parts per million
• LRU — Line Replaceable Unit
• CCSDS — Consultative/Consultative Committee for Space Data Systems
• CY — Calendar Year
• 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.
• DFD — Displaced Frame Difference
• ABI — Application Binary Interface
• ACK — ACKnowledgment
• CCM — counter-countermeasure
• QFSK — Quadrature Frequency Shift Keying
• WML — Wireless Markup Language
• MBR — Master Boot Record
• IRR — Internal Rate of Return
• ACH — Automated Clearing House
• ACE — Access Control Entry
• BIP — Bit-Interleaved Parity
• DBMS — Database Management System
• ATTN — Attention
• RPI — Retail Price Index
• ISP — Internet Service Provider
• NMSE — Normalized Mean Square Error
• TQM — Total Quality Management
• WWW3 — World Wide Web Consortium
• VAT — Value Added Tax

• CD — Compact Disc
• AATSR — Advanced Along-Track Scanning Radiometer
• NOS — Network Operating System
• ASA — American Standards Association
• CV — Curriculum Vitae
• WEP — Wired Equivalent Privacy
• EIS — Executive Information System
• BTU — British Thermal Unit
• CEO — Chief Executive Officer
• SMTP — Simple Mail Transfer Protocol
• BUR — Bandwidth Usage Redundancy
• RFP — Request For Proposal
• VM — Voice Mail
• LLC — Limited Liability Company
• GATT — General Agreement on Tariffs and Trade (government)
• LRJ — Location Reject
• GIS — Geographic Information System
• ATA — Area Transportation Authority
• NFS — Network File System
• PDA — Personal Digital Assistant
• HTTP — Hypertext Transfer Protocol
• ASME — American Society of Mechanical Engineers
• WDM — Wavelength Division Multiplexing (fiber optics)
• MB — Megabyte
• R&D — Research & Development
• RDY — Ready
• MOU — Memorandum of Understanding (an MOU between Food & Drug Administratin and a regulatory agency in another country allows mutual recognition of inspections)
• AIS — Automated Information System
• FIFO — First In, First Out
• ASTM — American Society for Testing and Materials (Philadelphia, Pennsylvania)
• PDT — Pacific Daylight Time
• FM — frequency modulation
• ADSL — Asymmetric Digital Subscriber Line
• ATM — Asynchronous Transfer Mode
• WBS — Work Breakdown Structure
• FAR — Federal Aviation Regulation
• RWR — Radar Warning Receiver
• SDMA — Space Division Multiple Access
• PDF — Portable Document Format (created by Adobe Acrobat)
• CS — Computer Science
• EOM — End Of Message
• MRI — Magnetic Resonance Imaging
• ALC — Automatic Level Control
• SRAM — Static Random Access Memory (ess-ram)
• AES — Advanced Encryption Standard
• PDH — Plesiochronous Digital Hierarchy
• THX — Thanks
• MMS — Multimedia Messaging Service
• BRB — Be right back
• STS — Space Transportation System

• ACO — Additional Call Offering
• CGI — Common Gateway Interface
• ABC — activity based costing
• Y2K — Year 2000
• DDD — Direct Distance Dial
• MST — Mountain Standard Time
• APT — Automatic Picture Transmission
• SAN — Storage Area Network
• BSD — Berkeley Software Distribution
• AIR — Account Information and Refill
• IPO — Initial Public Offering
• ADD — Addendum
• CAUCE — Coalition Against Unsolicited Commercial Email
• AAC — Advanced Audio Coding
• DSA — Digital Signature Algorithm
• AM — Ante Meridian
• PUHU — Pick Up Hang Up
• API — Application Programming Interface
• WAN — Wide Area Network
• COR — Carrier Operated Relay
• MTBF — Mean Time Before Failure
• EPA — Environmental Protection Agency (US)
• EST — Eastern Standard Time
• URL — Universal Resource Locator
• ACD — Automatic Call Distributor
• HSD — High Speed Data
• CR — Carriage Return
• PCB — printed circuit board
• CAE — Computer-Aided Engineering
• DOA — dead on arrival
• ATCRBS — Air Traffic Control Radar Beacon System
• CIO — Chief Information Officer
• SLA — Service Level Agreement
• ARPA — Advanced Research Projects Agency (made early internet)
• ADM — Add/Drop Multiplexer
• RFC — Request For Comment
• EFF — Electronic Frontier Foundation
• ASCII — American National Standard Code for Information Interchange
• DDL — Data Definition Language
• AES — Auger Electron Spectroscopy
• UAV — Unmanned Aerial Vehicle
• JV — Joint Venture
• GPRS — General Packet Radio Service
• DMSP — Defense Meteorological Satellite Program (U.S.)
• FAA — Federal Aviation Administration
• SCSI — Small Computer System Interface
• EC — European Commission
• ADR — Address
• RDBMS — Relational Database Management System
• ABR — Available Bit Rate

• DME — Distance Measuring Equipment
• SCC — Standards Council of Canada
• DB — Decibel
• GUI — Graphical User Interface (goo-ey)
• RNC — Radio Network Controller
• AME — Amplitude Modulation Equivalent
• EW — Electronic Warfare
• SWAG — Scientific Wild Ass Guess
• AM — Amplitude Modulation
• NIC — Network Interface Card
• VHF — Very High Frequency
• FX — Foreign Exchange
• RAM — random-access memory
• WWW — World Weather Watch
• CPT — Carriage Paid To
• CCIS — Common Channel Interoffice Signaling
• GPS — Global Positioning System (ex-NAVSTAR)
• SD — Standard Deviation
• VVX — Voice and Video eXchange
• AC — Access Control
• CCTV — Closed-circuit television
• AOA — Angle Of Arrival
• ACL — Access Control List
• TCB — Trusted Computing Base
• CIR — Committed Information Rate (Frame Relay)
• EU — European Union (1994; formerly referred to as the EEC or EC)
• QMS — Quality Management System
• TTYL — Talk To You Later (Internet Slang)
• DES — Data Encryption Standard
• ASR — Airport Surveillance Radar
• VR — Virtual Reality
• NPV — Net Present Value {economics}
• NATO — North Atlantic Treaty Organisation
• 100BASE-T2 — 100 Megabits per Second, Baseband, Two-pair Category 3 UTP cables
• ICT — Information and Communication Technology
• AD — Active Directory
• CPM — Critical Path Method
• CIS — Commonwealth of Independent States
• EBCDIC — Extended Binary Coded Decimal Interchange Code (pronounced Eb-see-dik) (cf. BCD)
• CU — Control Unit
• AVHRR — Advanced Very High Resolution Radiometer  
• UPS — Ultraviolet Photoelectron Spectroscopy
• NIH — Not Invented Here
• MOB — Mobile
• ASK — amplitude shift keying
• RU — Are You?
• SME — Subject Matter Expert
• SLF — Super Low Frequency
• BECN — Backward Explicit Congestion Notification
• JAXA — Japan Aerospace Exploration Agency

• WLTF — Wireless LAN (Local Area Network) Task Force
• TCP — Transmission Control Protocol
• SLIP — Serial Line Interface Protocol
• DTE — Data Terminal Equipment
• RPC — Remote Procedure Call
• QI — Quality Improvement
• SDR — Special Drawing Rights
• DHCP — Dynamic Host Configuration Protocol
• SXS — Step-By-Step
• QOS — Quality of Service
• NPI — New Product Introduction
• CRT — Cathode Ray Tube (type of TV)
• DMTS — Distinguished Member Of Technical Staff
• SP — Service Provider
• SQA — Software Quality Assurance
• ATF — Advanced Tactical Fighter
• WAFB — Wireless Absolute Fairness Bound
• RM — Resource Management
• PVT — Private
• APIC — Advanced Programmable Interrupt Controller
• DTX — Discontinuous Transmission
• SAS — Statistical Analysis System
• TNSTAAFL — There's No Such Thing As A Free Lunch
• TC — Telephone Call
• ACK — Acknowledge (telecommunications; Cf. NAK)
• TBD — To Be Determined
• CB — Call Back
• CBC — cipher block chaining
• USB — Universal Serial Bus
• I/O — Input/Output
• RACON — Radar Beacon
• MSN — Microsoft Network
• WB — Welcome Back
• ERP — Enterprise Resource Management
• IM — Instant Message
• EMG — Electromyogram
• DFS — Distributed File System
• PO — Purchase Order
• PDN — Public Data Network
• GRE — Generic Routing Encapsulation
• ATS — applications technology satellite
• CDR — Call-Detail Record
• ACM — Association for Computing Machinery
• CMI — Computer Managed Instruction
• TAC — Technical Assistance Center
• IRLAN — Infrared LAN
• FFT — Fast Fourier Transform
• CM — Configuration Management
• ACE — Advanced Computing Environment
• BCC — Blind Carbon Copy

• B3ZS — bipolar 3-zero substitution
• CRL — Certificate Revocation List
• CFE — Contractor-Furnished Equipment
• ATM — Adobe Type Manager
• SIG — Special Interest Group
• ABET — Accreditation Board for Engineering and Technology, Inc.
• MDA — Monochrome Display Adapter
• CC — Carbon Copy
• ISO — Infrared Space Observatory
• NMT — Nordic Mobile Telephone
• EDS — Electronic Data Systems Corporation
• Q&A — Question & Answer
• ADPE — Automatic Data Processing Equipment
• PM — Preventive Maintenance
• RPM — Revolutions Per Minute, (Rotations Per Minute)
• OMG — Object Management Group
• UHF — Ultra High Frequency (300-3000 MHz; 1m-10cm)
• DARPA — Defense Advanced Research Projects Agency (US)
• VTC — Video Teleconference
• IVR — Interactive Voice Response (telephone technology)
• PAR — Precision Approach Radar
• LCP — Link Control Protocol
• MIS — Management Information System (OSHA)
• AP — Application Protocol
• ISRO — Indian Space Research Organisation
• M — Meter
• DMX — De-MultipleXer
• ATC — Air traffic control
• ACFQ — Absence Compensation Fair Queuing
• LEO — Low Earth Orbit (satellite communications)
• 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.
• MAC — Message Authentication Code
• AAAI — American Association for Artificial Intelligence's
• SDD — Software Design Document
• PGP — Pretty Good Privacy (encryption)
• DOD — United States Department of Defense
• P&L — Profit and Loss statement
• DNS — Domain Name System
• DRAM — Dynamic Random Access Memory (dee-ram) (computing)
• DC — Direct Current
• EEC — European Economic Community (predecessor of the European Union|EU)
• CIM — Corporate Information Management
• SMS — Short Message Service
• PLMN — Public Land Mobile Network
• NSF — National Sanitation Foundation
• AGP — Accelerated Graphics Port
• EVP — Executive Vice President
• ENIAC — Electronic Numerical Integrator And Computer
• AE — Application Entity
• PLD — Programmable Logic Device

• IETF — Internet Engineering Task Force
• CBT — Computer Based Training
• DIT — Directory Information Tree
• IMPACT — Integrated Manufacturing Precision Assembly Cellular Technology
• AE — Account Executive
• CAM — Computer-Aided Mapping
• PNG — Portable Network Graphics (graphic file standard/extension)
• VIRUS — Vital Information Resources Under Siege
• BS — Base Station
• NYSE — New York Stock Exchange
• MIC — Message Integrity Check
• EAP — Extensible Authentication Protocol
• SEI — Software Engineering Institute
• FAQ — Frequently Asked Questions (sometimes Pronounced Fak)
• FCW — Federal Computer Week
• AGC — Automatic Gain Control
• SGML — Standard Generalized Markup Language
• CAD — Computer Aided Designer
• DSS — Decision Support System
• QA — Center for Quality Assurance in International Education
• OCR — Optical Character Recognition
• COO — Chief Operation Officer
• AF — Audio Frequency
• MTTR — Mean Time To Repair
• BBU — Baseband Unit
• VPN — Virtual Private Network (ATM)
• NEC — National Electrical Code
• BPRZ — Bipolar Return-to-Zero
• OBO — Or Best Offer
• CU — See You
• RFI — Request For Information. Sales department shorthand. Special priority when use in conjunction with RFN (see below).
• DOJ — Department of Justice (US)
• FDDI — Fiber Distributed Data Interface
• JIT — Just in time
• MS — Mobile Station
• DLC — Digital Loop Carrier
• MOS — Model Output Statistics
• DSA — Directory System Agent
• DLR — Design Layout Record
• TOS — Type Of Service
• VDS — Variable Depth Sonar
• EGA — Enhanced Graphics Adapter
• TV — Television
• TPDU — Transport Protocol Data Unit
• MS — Message Store
• POP — Point Of Presence (Internet)
• ISDN — Integrated Services Digital Network
• CAM — computer aided manufacturing
• OSS — Operational Support System
• CIC — Circuit Identification Code

• CIM — Common Information Model
• BBS — Bulletin Board System
• QAM — quadrature amplitude modulation
• OSI — Open Systems Interconnection (iso Standard)
• SOW — Statement Of Work
• UAS — Unavailable Seconds
• AFC — Automatic Frequency Control
• BST — British Summer Time
• CDS — Cell Directory Service
• O&M — Operation and Maintenance
• BT — British Telecommunications
• TM — Technical Manual
• ME — Mobile Equipment
• AT — Advanced Technology
• RFI — Radio Frequency Interference
• Z — Zero
• ICMP — Internet Control Message Protocol
• HDLC — High-Level Data Link Control
• JIS — Japanese Industrial Standard
• IS — Intermediate System
• ROI — Return on Investment
• RCU — Remote Control Unit
• ADF — Automatic Direction Finder
• TS — Technical Specification
• DQE — Detective Quantum Efficiency
• ARP — Address Resolution Protocol (ATM)
• CERT — Computer Emergency Response Team
• OSPF — Open Shortest Path First (ATM)
• AT — Access Tandem
• MF — Medium Frequency
• PECVD — Plasma-Enhanced Chemical Vapor Deposition
• BCD — Binary-Coded Decimal
• ZIP — Zone Improvement Plan
• PDU — Protocol data unit (such as segment, packet, frame, etc.)
• LLC — Logical Link Control
• ECO — Engineering Change Order
• IW — Information Warfare
• FC — Fibre Channel
• CW — Continuous Wave
• PE — Polyethylene
• HSDPA — High-Speed Downlink Packet Access
• RIP — Routing Information Protocol
• CC — Call Control
• ISS — International Space Station
• CLNP — ConnectionLess-mode Network Protocol
• PAL — Programmable Array Logic
• MHS — Message Handling System (electronic)
• CRM — Customer Relationship Management
• EEPROM — Electrically Erasable Programmable Read-Only Memory
• CUL — See You Later

• RCC — Rescue Coordination Center
• LF — Low Frequency
• CHAP — Challenge Handshake Authentication Protocol (ATM)
• AML — Amplitude Modulated Link
• AMD — Advanced Micro Devices, Inc. (producer of computer chips)
• NAS — Network Access Server
• ERT — Emergency Response Team
• CAA — Civil Aviation Authority
• ADT — Abstract Data Type
• SSM — Source-Specific Multicast
• NSA — National Security Agency
• MPI — Message Passing Interface
• RM — Regional Manager
• DSL — Digital Subscriber Line
• VM — Virtual Machine
• CBDS — Connectionless Broadband Data Service
• ECN — Explicit Congestion Notification
• DT — DWDM (Dense Wavelength Division Multiplexing) Terminal
• DCE — Distributed Computing Environment
• COMJAM — Communications Jamming
• HW — Hardware
• DPC — Destination Point Code
• PMA — Physical Medium Attachment
• DDE — Dynamic Data Exchange (in software parlance)
• CS — Cable Select
• YP — Yellow Pages
• JSC — Johnson Space Center (Houston, TX)
• WMAN — Wireless Metropolitan Area Network
• COO — Cost of Ownership
• AAAS — American Association for the Advancement of Science
• MLS — Multiple Listing Service
• TLS — Transport Layer Security
• SEM — Space Environment Monitor
• IDT — Integrated Digital Terminal
• VB — Visual Basic
• RAD — Rapid Application Development
• DTR — Data Terminal Ready
• MHS — Microwave Humidity Sounder
• RAID — Redundant Array of Inexpensive Disks
• ERP — Enterprise Resource Planning
• BR — Branch
• SQL — Structured Query Language
• STI — Speech Transmission Index
• PT — Project Team
• RDP — Radar Data Processing
• UR — Your
• FIPS — Federal Information Processing Standard
• PRI — Primary Rate Interface (ISDN)
• PC — Personal computer (host)
• NA — Not Applicable

• FCA — Free Carrier
• AADC — Automated Area Distribution Center
• TBD — To Be Decided
• PWD — Password
• DQPSK — Differential Quadrature Phase-Shift Keying
• ITU — International Telecommunication Union
• DOM — Document Object Model
• MVS — Multiple Virtual Storage
• BER — Bit-Error Rate
• VAC — Vacant
• LCN — Logical Channel Number
• COQ — Cost Of Quality
• RFS — Request For Service
• SAIC — Science Applications International Corporation
• URI — Uniform Resource Identifier
• EDVAC — Electronic Discrete Variable Automatic Computer
• MS — Management System
• PSTN — Public Switched Telephone Network
• PERT — Program Evaluation and Review Technique
• AXE 10 — Series of electronic telephone exchanges from L.M. Ericsson
• WS — Workstation
• APC — American Power Conversion
• AFSK — Audio Frequency Shift Keying
• AR — Access Rate
• CEV — Controlled Environment Vault
• NIST — National Institute of Standards and Technology
• MS — Millisecond
• FA — Functional Area
• DLL — Dynamic Link Library (computer file)
• IRS — U.S. Internal Revenue Service
• W3C — World Wide Web Consortium
• BPR — Business Process Re-engineering
• AMT — Amount
• JPL — Jet Propulsion Laboratory (California Institute of Technology) (NASA)
• NI — Network Interface
• LED — law enforcement desk; light emitting diode
• NESDIS — National Environmental Satellite, Data, and Information Service
• ARPU — Average Revenue Per User
• LSR — Local Service Request
• AS — Autonomous System
• OM — Old Man
• SIL — Speech Interference Level
• SOHO — Small Office Home Office
• CLI — Command line Interface (Cabletron)
• HZ — cycles per second (hertz)
• OTN — Optical Transport Network
• VOP — Voice Over Packet
• CABS — Carrier Access Billing System
• AMI — Advanced Metering Infrastructure
• GB — Gigabyte

• IPX — Internetwork Packet Exchange
• BRA — Basic Rate Access
• SA — Scientific American
• CO — Certificate of Origin
• DMA — direct memory access (computer term)
• HF — High Frequency
• IS — International Standard
• VOD — Video On Demand
• DOS — Disk Operating System
• UAN — Universal Access Number
• CDT — Central Daylight Time
• FXO — Foreign Exchange Office
• DSSS — Direct Sequence Spread Spectrum
• KISS — Keep It Simple Stupid
• DIS — Distributed Interactive Simulation
• ISI — Inter-Symbol Interference
• DSTE — Digital Subscriber Terminal Equipment
• F — Fellow
• RFO — Reason For Outage
• NMR — Nuclear Magnetic Resonance
• GSA — U.S. General Services Administration
• SVC — Scalable Video Coding
• E — Energy
• COM — Component Object Model
• NOTAM — Notice to Airmen
• AMI — Alternate Mark Inversion
• PRF — Pulse Repetition Frequency
• AQL — Acceptable Quality Level
• DNIS — Dialed Number Identification Service
• MC — Message Center
• WYSIWYG — What You See Is What You Get (pronounced Wizzy-wig. See Entry For Derived Acronyms)
• LP — Low Pressure
• USD — United States Dollar
• OMS — Optical Multiplex Section
• SM — Senior Member
• ATSR — Along-Track Scanning Radiometer
• RTS — Request To Send
• CIA — Central Intelligence Agency
• OS — Operating System
• BIS — Bureau of Indian Standards
• SEC — Software Engineering Center
• CGI — Computer-Generated Imagery
• NTIA — National Telecommunications and Information Administration
• IEC — International Electrotechnical Commission
• CATV — Community Antenna Television
• PIN — Personal Identification Number
• AEC — Architecture, Engineering, Construction
• ITSEC — Information Technology Security Evaluation Criteria
• IP — Intelligent Peripheral
• EAS — Extended Area Service

• SCTP — Stream Control Transmission Protocol
• SNR — Signal-to-Noise Ratio
• SIC — Standard Industrial Classification (Code)
• ASR — Access Service Request
• TCP/IP — transmission control protocol/internet protocol
• CDMA — Code Division Multiple Access (voice/data transmission)
• AU — Audio Unit
• EEG — Electro-EncephaloGram
• TEC — Total Electron Content
• NLMS — Normalized Least Mean Square
• PCI — Peripheral Component Interconnect
• ACR — Attenuation Crosstalk Ratio
• RACF — Resource Access Control Facility
• NOAA — National Oceanic and Atmospheric Administration (US)
• ECT — Explicit Call Transfer
• MSE — Mobile Subscriber Equipment
• CT — Computer Telephony
• TB — Terabyte
• IN — Intelligent Network
• UA — User Agent
• ARA — Apple Remote Access
• ASP — Application Service Provider
• PPB — parts per billion (109)
• NTFS — New Technology File System
• MSR — Microwave Scanning Radiometer
• ARPANET — ARPA Network
• SBC — Southwestern Bell Corporation
• MSU — Microwave Sounding Unit
• CAC — Carrier Access Code
• PDS — Protected Distribution System
• AIS — Alarm Indication Signal
• ROFL — Rolling on the floor laughing
• EPR — Electron Paramagnetic Resonance
• DASD — Direct Access Storage Device
• SPC — Stored Program Control
• ASQC — American Society for Quality Control's
• DMARC — Demarcation point
• VOL — Volume
• UL — Uplink
• FCS — Frame check sequence (Ethernet)
• SCP — Service Control Point
• DA — Destination Address
• BACP — Bandwidth Allocation Control Protocol
• ISA — Industry Standard Architecture
• CMS — Content Management System
• CMM — Capability Maturity Model
• STP — Spanning Tree Protocol
• MCSD — Microsoft Certified Solution Developer
• ES — Errored Second
• ELINT — Electronic Intelligence Satellite

• LF — Line Feed
• MD — Mediation Device
• TNX — Thanks
• LD — Long Distance
• M — Management
• TOP — Technical Office Protocol
• PAN — Personal Area Network
• BSOD — Blue Screen Of Death
• WB — Write Back
• ZIP — Zone Information Protocol
• HVAC — Heating, Ventilation, and Air Conditioning
• NIC — Network Information Center
• LPC — Linear Predictive Coding
• SPI — Service Provider Interface
• AFS — Andrew File System
• RH — Relative Humidity
• FR — Frame Relay
• NIS — Network Information Service
• RCV — Receive
• CAB — Conformity Assessment Body
• ADC — Analog-Digital Converter
• DCP — Design Change Package
• DIBL — Drain-induced Barrier Lowering
• VLL — Virtual Leased Line
• FCP — Fibre Channel Protocol
• CA — Certificate Authority
• RT — Remote Terminal
• WG — Working Group
• 3G — Third Generation mobile phone network
• IIS — Internet Information Services
• BNSC — British National Space Centre
• MP — Multilink Protocol
• TRM — Technical Reference Model
• PGA — Programmable Gate Array
• DAP — Directory Access Protocol
• AFP — AppleTalk Filing Protocol
• TG — Task Group
• DVP — Digital Voice Privacy
• 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
• MRC — Monthly Recurring Charge
• SAE — Society of Automotive Engineers
• RA — Risk Analysis
• MDA — Model Driven Architecture
• PABX — private automatic branch exchange (telephone)
• DS — Digital Signal
• CST — Central Standard Time (UTC-6 Hours)
• MAC — Media Access Control
• BYOD — Bring Your Own Device
• NTIS — National Technical Information Service Technology Administration
• CAN — Campus Area Network

• 1000BASE-T — 1000 Megabits per Second, Baseband, Twisted Pair
• CTD — Cumulative Trauma Disorder
• CFO — Communication Filing Officer
• DCN — Design Change Notification
• DTI — Department of Trade and Industry (UK)
• FTTB — Fiber To The Building
• ATN — Aeronautical Telecommunication Network
• MCU — Multipoint Control Unit
• NEMA — National Electric Manufacturer's Association
• NLM — National Library of Medicine (National Institutes of Health)
• AT&T — American Telephone and Telegraph (U.S. company, also known as "Ma Bell")
• DCOM — Distributed Component Object Model
• AMLCD — Active Matrix Liquid Crystal Display
• AEW — Airborne Early Warning
• AT&T — American Telephone & Telegraph
• EOT — End Of Transmission
• EPABX — Electronic Private Automatic Branch Exchange
• VLF — Very Low Frequency
• STM — Short Term Memory
• CF — Compact Flash
• BPS — bits per second
• CG — Coast Guard
• LPE — Liquid Phase Epitaxy
• FCC — Federal Communications Commission (US)
• CAV — Constant Angular Velocity
• CATV — Cable Television
• HTTPS — HyperText Transfer Protocol Secure
• SNMP — Simple Network Management Protocol (ATM)
• UTC — Coordinated Universal Time
• GOS — Grade Of Service
• ADN — Advanced Digital Network
• MDF — Main Distribution Frame
• CTS — Clear To Send
• P — Predicted
• ISBN — International Standard Book Number (ISO 2108)
• SPADATS — Space Detection And Tracking System
• BT — BlueTooth
• BRI — Basic Rate Interface
• DCS — Digital Cross-connect System
• WPS — Wireless Priority Service
• TN — Telephone Number
• ASI — Asynchronous Serial Interface
• NMS — Network Management System
• SSL — Secure Socket Layer
• MTSO — Mobile Telephone Switching Office
• PBX — Private Branch eXchange (company phone system)
• TE — Traffic Engineering
• TWT — Traveling Wave Tube
• OPC — Originating Point Code
• SAN — System Area Network

• LZ — Landing Zone
• NCS — National Communications System
• RTN — Regional Telecommunication Network
• BGP — Border Gateway Protocol (routing protocol)
• EMC — Electromagnetic Compatibility
• ADEOS — ADvanced Earth Observing Satellite (Japan)
• PD — Public Domain
• CIS — CompuServe Information Service
• STP — Signal Transfer Point
• CRC — Contrôle de Redondance Cyclique (French: Cyclic Redundancy Check)
• KHZ — kilohertz (1000 cycles per second)
• CSAT — Customer Satisfaction
• FUP — Fair Use Policy
• GDS — Global Distribution System
• Y — Yttrium
• HDML — Handheld Device Markup Language
• STK — Satellite Tool Kit
• OLAP — Online Analytical Processing
• ESS — Electronic Switching System
• FE — Far End
• ASR — Automatic Speech Recognition
• UI — User Interface
• PUB — Publication (file name extension)
• OAS — Organization of American States
• BIP — Band Interleaved by Pixel
• EDD — Envelope Delay Distortion
• EPR — Ethylene-Propylene Rubber
• ISSN — International Standard Serial Number (ISO 3297)
• TCSEC — Trusted Computer System Evaluation Criteria
• BOC — Bell Operating Company
• DUP — Duplicate
• RFD — Request For Discussion
• ELF — Extremely Low Frequency
• TCO — Total Cost of Ownership
• SVD — Singular Value Decomposition
• MOL — Manned Orbiting Laboratory
• UN — United Narions
• OC — Optical Carrier
• NRC — National Research Council (Canada)
• DBS — Direct Broadcast Satellite
• SHF — Super High Frequency
• MME — Mobility Management Entity
• DID — direct inward dial
• SVC — Switched Virtual Connection
• SBC — Session Border Controller
• FCA — Free Carrier Absorption
• AOI — Area Of Interest
• SOAP — Simple Object Access Protocol
• NBS — National Bureau of Standards (US)
• SVP — Senior Vice President

• BS — Beam Splitter
• ARC — Army Reuse Center
• EAC — Engineering Accreditation Commission
• FITS — Flexible Image Transport System
• IS — Information System
• AAS — Adaptive Antenna System
• BG — Background
• ROSAT — Roentgen Satellite
• DDS — Digital Data Service
• IANA — Internet Assigned Numbers Authority
• ECAC — European Civil Aviation Conference
• EDP — Electronic Data Processing Plc (London Stock Exchange [LSE])
• OSHA — Occupational Safety and Health Act (1970)
• ISAS — Institute of Space and Astronautical Sciences (Japan)
• SML/SMS — Service Management Layer/Service Management Service
• DAL — Dedicated Access Line
• AVL — Available
• DX — Duplex
• PSD — Phase-Sensitive Detector
• ASIC — application-specific integration circuit
• C4 — Command, Control, Communications, and Computers
• DSP — Digital Signal Processor
• SHA — Secure Hash Algorithm
• EMR — Electromagnetic Radiation
• FASB — Financial Accounting Standards Board
• ADT — Atlantic Daylight Time (UTC-3 Hours)
• PPP — Point-to-Point Protocol
• DID — Digital Information Display
• CMT — Cadmium Mercury Telluride
• SBU — Strategic Business Units
• SCN — Switched Circuit Network
• TO — Technical Order
• CNM — Customer Network Management
• HSS — Home Subscriber Server
• MIPS — Millions of Instructions Per Second
• RSVD — Reserved
• ATA — Analog Telephone Adapter
• PM — Project Manager
• LEP — Large Electron Positron
• PVC — Permanent Virtual Circuit (ATM)
• EFS — Encrypting File System
• LEN — Line Equipment Number
• CU — Channel Unit
• SCM — Supply Chain Management
• DEC — Decimal
• RT — Radiotelephone
• VC — Virtual Channel
• BERT — Bit Error Rate Tester (telecommunication)
• ACTV — Active
• ADCCP — Advanced Data Communications Control Procedures

• MCA — Micro Channel Architecture
• TE — Test Equipment
• ECP — Encryption Control Protocol
• MCD — Magnetic Circular Dichroism
• ESTEC — European Space Research and Technology Centre
• OTS — Optical Transmission Section
• IP — Intellectual Property
• RSRQ — Reference Signal Received Quality
• MMU — Memory Management Unit
• PDS — Planetary Data System
• JPEG — Joint Photographic Experts Group (24-bit image storage format)
• OLE — Object Linking and Embedding (Microsoft communication protocol)
• YL — Young Lady
• AMHS — Automated Message Handling System
• JVM — Java Virtual Machine
• AM — Activity Manager
• ANI — Automatic Number Identification (Caller ID)
• METRO — Metropolitan
• 10BASE-T — 10 Megabits per second, Baseband, Twisted pair
• Y — Yes
• AIN — Advanced Intelligent Network
• CORBA — Common Object Request Broker Architecture
• OSTP — Office of Science and Technology Policy
• RARP — Reverse Address Resolution Protocol
• RTU — Remote Terminal Unit
• ETS — European Telecommunication Standard
• ASARS — Advanced Synthetic Aperture Radar System
• ACT — Activity
• AWG — American Wire Gauge
• SF — Single Frequency
• PDC — Personal Digital Cellular
• CB — Common Battery
• DSN — Deep Space Network - network of large antennas and communication facilities.
• FAA — Federal Aviation Agency
• AAF — Advanced Authoring Format
• MOD — Modify
• DC — Display Controller
• ECMA — European Computer Manufacturer's Association
• DC — Disconnected
• TLC — The Learning Channel
• SL — Single Line
• QPSK — aeronautical quadrature phase shift keying
• WWAN — Wireless Wide Area Network
• B2C — Business-to-Consumer
• CCTA — Central Computer and Telecommunications Agency
• MIB — Management Information Base (ATM)
• NNM — Network Node Manager
• EIP — Equipment installation procedure
• CER — Cell Error Ratio
• SAR — Specific Absorption Rate

• ROS — Return on Sales
• TSR — Telecommunications Service Request
• SIT — Static Induction Transistor
• EFT — Electronic Funds Transfer
• RT — Response Time
• APPL — Application
• DCN — Disconnect
• FTTH — Fiber To The Home
• PS — Product Specification
• FR PVC — Frame Relay Permanent Virtual Connection
• NIST — National Institute of Standards & Technology (US)
• MTU — Maximum Transmission Unit
• CBP — Coded Block Pattern
• DCS — Digital Cross-Connect
• BPDU — Bridge Protocol Data Unit
• CFA — Carrier Facility Assignment
• ARG — Argument
• APM — Advanced Power Management
• YYP — Yahoo Yellow Pages
• SLP — Service Location Protocol
• FDL — Facility Data Link
• PST — Pacific Standard Time (UTC-8 Hours)
• VT — Vacuum Tube
• EX — Exercise
• DL — Digital Library
• RDF — Radio Direction Finder
• A — Anode
• SCADA — Supervisory Control And Data Aquisition
• VOIP — Voice Over IP (Internet Protocol)
• FE — Finite Element
• E — Echo
• D-RAM — Dynamic Random Access Memory
• LLU — Local Loop Unbundling
• DSLAM — Digital Subscriber Line Access Multiplexer (Module)
• DUC — Digital Up-Converter
• B2B — Business to Businesse
• OAM&P — Operations, Administration, Maintenance & Provisioning
• LU — Logical Unit
• CSPRM — Common Signaling Protocols Resource Module
• SD — Software Development
• AS — Access System
• PE — Probable Error
• EISA — Extended Industry Standard Architecture
• BTC — Botswana Telecommunications Corporation
• BIOS — Basic Input Output System
• CS — Convergence Sublayer (ATM)
• NIC — Network Interface Controller
• SRS — Software Requirements Specifications
• TI — Time Interval
• STA — State

• TE — Terminal Equipment
• PTA — Pakistan Telecommunication Authority
• DRM — Digital Rights Management
• EEA — European Economic Area
• 9 — Nine
• CAPS — Call Attempts Per Second
• ARIN — American Registry for Internet Numbers
• ADL — Advanced Distributed Learning
• CIFS — Common Internet File System
• RSN — Real Soon Now [which may be a long time coming]
• AYT — Are You There
• APS — Automatic Protection Switching (SONET/SDH)
• BS — Broadcast Satellite
• ARINC — Aeronautical Radio Incorporated
• LDAP — Lightweight Directory Access Protocol (pronounced Ell-dap)
• CMP — Connection Management Protocol
• AUD — Audit
• CO — Central Office
• UP — User Profile
• SAS — Special Access Surcharge
• Q — Quadrature
• PKI — Public Key Infrastructure (cryptography)
• LMS — Learning management system
• TCM — Trellis-Coded Modulation
• ECP — Engineering Change Proposals
• CDC — Connected Device Configuration
• BSS — Basic Service Set
• IV — Initialization Vector
• RJ-25 — Registered Jack type 25 (6-wire connector)
• LQR — Linear Quadratic Regulator
• NNTP — Network News Transfer Protocol
• RMS — root mean square (preferred over "RMS")
• CAM — Content Addressable Memory
• TOS — Temporarily Out of Service
• DID — data item description
• CMD — Command
• EDT — Eastern Daylight Time
• CHF — Swiss Franc
• BUS — Business
• PIC — Peripheral Interface Controller
• IT — Integration Test
• PCM — Pulse-Code Modulation
• OFC — Office
• CGM — Computer Graphics Metafile
• FAX — Facsimile
• CCSD — command communications service designator; control communications service designator
• ITP — Interactive Telecommunications Program
• ECPA — Electronic Communications Privacy Act 1986
• PM — post meridian
• MIME — Multipurpose Internet Mail Extension

• VGA — Video Graphics Array
• NOC — Network Operations Center
• PAP — Password Authentication Protocol (ATM)
• BIU — Bus Interface Unit
• ACF — Access Control Field
• DCS — Digital Cellular System
• WPM — speech--words per minute
• SATAN — Security Administrator Tool for Analyzing Networks
• TAG — Technical Advisory Group for Biological Control Agents of Weeds
• CG — Center of Gravity (DXS)
• ABN — Abnormal
• WIPO — World Intellectual Property Organization
• PPARC — Particle Physics and Astronomy Research Council
• LT — Less Than
• USGS — United States Geological Survey (DOI)
• JAN — Joint Army-Navy
• WMO — World Meteorological Organization (ICSU)
• ECE — Economische Commissie voor Europa (United Nations) (Dutch: Economic Commission for Europe)
• SW — South West
• WTO — World Trade Organisation
• TMS — Time Management System
• PMP — Project Management Professional
• ROTFL — Roll On The Floor Laughing
• DTMF — Dual-Tone MultiFrequency
• POTS — Plain Old Telephone Service (FCW)
• EMS — Express Mail Service
• SPM — Scanning Probe Microscope
• KM — Knowledge Management
• AFM — Atomic Force Microscopy
• BSS — Base Station Subsystem
• EAI — Enterprise Application Integration
• WLAN — Wireless Local Area Network
• VT — Virtual Terminal
• CCD — Charge Coupled Device - a device for the movement of electrical charge.
• EMEA — Europe, Middle East and Africa
• HTML — Hyper Text Markup Language
• UPS — Uninterruptible Power Supply
• VOA — Voice Of America
• BOD — Bandwidth on Demand
• PG — Page
• SIM — Subscriber Identity Module
• 911 — Emergency Services Phone Number
• FEP — Front End Processor
• NPA — Numbering Plan Area
• WPAN — Wireless Personal Area Network
• NAFTA — North American Free Trade Agreement
• PVD — Physical Vapor Deposition
• 2W — Two Wire
• TCR — Temperature Coefficient of Resistance
• SML — Service Management Layer

• SUS — Suspension
• CSO — Customer Service Operations
• FSK — Frequency-Shift Keying
• MX — Mixer
• CDA — Command and Data Acquisition
• MAI — Multiple Access Interference
• ICANN — Internet Corporation for Assigned Names and Numbers
• KB — Kilobyte: One thousand and twenty-four bytes kbps kilo bit per second
• NA — Network Adapter
• TSB — Telecommunication Standardization Bureau
• B3G — Beyond Third Generation
• SPGA — Staggered Pin Grid Array
• RAN — Radio Access Network
• CD — Critical Dimension
• FAT — File Allocation Table
• SA — Source Address
• SOGA — Share of Gross Adds
• TDOA — Time Difference Of Arrival
• SB — Switchboard
• T&C — Terms & Conditions
• WAP — Wireless Application Protocol
• SZ — Seizure
• ECM — Electronic Counter Measures
• TLK — Talk
• ELT — Emergency Locator Transmitter
• EFIS — Electronic Flight Information System
• CES — Consumer Electronics Show
• MIT — Massachusetts Institute of Technology (U.S.)
• E&M — ear and mouth (special signaling leads)
• DDL — Digital Data Link
• BAN — Base Area Network
• DPL — Digital Power Line
• FRS — Family Radio Service
• RSS — Really Simple Syndication
• CRIS — Carrier Route Information System
• 100BASE-T4 — 100 Megabits per Second, Baseband, Four-pair Category 3 UTP cables
• FRS — Frame Relay Service
• VSAT — Very Small Aperture Terminal (satellite service)
• ACLR — Adjacent Channel Leakage Ratio
• IRS — Inertial Reference System
• ISM — Industrial, Scientific and Medical
• IRS — Interface Requirements Specification
• ECR — Electronic Cash Register
• C — Cost
• MV — Motion Vector
• RSVP — Resource Reservation Protocol (Internet)
• MIDP — Mobile Information Device Profile
• ACPI — Advanced Configuration and Power Interface
• ATC — Advanced Technology Center
• JST — Japan Standard Time

• PDT — Portable Data Terminal
• CRO — Central Records Office
• CAD — Computer-Aided Design
• CB — Citizens' Band
• SPC — Statistical Process Control. Forerunning quality theory from the 1960s to TQC and TQM.
• PC — Peripheral Controller
• IMSI — International Mobile Subscriber Identity
• CFD — computational fluid dynamics
• CGA — Carrier Group Alarm
• TTY — Teletype Telex Machine
• TOVS — TIROS Operational Vertical Sounder
• WTLS — Wireless Transport Layer Security
• MGMT — Management
• ASQ — Alpha System Qualification
• PCMCIA — Personal Computer Memory Card International Association
• BCH — Binary Coded Hexadecimal
• ACE — Adaptive Communication Environment
• NES — Network Encryption System
• EHF — Extremely High Frequency
• TSE — Toronto Stock Exchange
• SPX — Sequenced Packet Exchange
• 100BASE-T — 100 Megabits per second, Baseband, Twisted pair
• SMR — Specialized Mobile Radio
• AIFF — Audio Interchange File Format
• NCSC — National Computer Security Center (NSA)
• CTU — Central Terminal Unit
• CPC — Continous Packet Compression
• AIT — Automatic Identification Technology
• 2W — 2-Wire
• EECM — End-to-End Call Manager
• OSCAR — Orbiting Satellite Carrying Amateur Radio
• EM — Electromigration
• PIM — Personal Information Manager
• TOA — Time Of Arrival
• CS-PDU — Convergence Sublayer - Protocol Data Unit
• ARQ — Automatic Repeat-reQuest
• BBM — Blackberry Messenger
• SRM — Scalable Reliable Multicast
• RP — Reference Point
• CBWFQ — Class Based Weighted Fair Queueing
• ASDE — Airport Surface Detection Equipment
• ODBC — Open Database Connectivity
• EGP — Exterior Gateway Protocol
• KAK — Key-Auto-Key
• SPA — Software Publishers Association
• O/S — Operating System
• TAD — Telephone Answering Device
• BS — Backing Store
• PM — Phase Modulation
• PSS — Performance Support System

• DL — Data Link
• SDLC — Synchronous Data Link Control
• ESF — Edge Spread Function
• CAP — Capability
• ADF — automatic document feeder
• DS-0 — Digital Signal, Level 0
• HEHO — Head End Hop Off
• SLV — Satellite-Launch Vehicle
• SG — Signaling Gateway (IETF)
• MDM — Mobile Device Management
• SDH — Synchronous Digital Hierarchy (ATM)
• TDM — Time Division Multiplexer
• IRDA — Infrared Data Association
• PU — Physical Unit (IBM)
• SIL — Silence
• CQA — Certified Quality Auditor
• DNIC — Data Network Identification Code
• 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)
• NTP — Network Time Protocol
• CBR — Constant Bit Rate
• ESP — Encapsulating Security Payload
• SDK — Software Development Kit (Microsoft)
• B6ZS — Bipolar 6 Zero Substitution
• COM — Comedy Central
• FAS — Frame Alignment Signal
• CFD — Call For Discussion
• QDR — Quad Data Rate
• IEC — Interexchange Carrier
• ES — Emergency Service
• CSC — Common Signaling Channel
• DAT — Digital Audio Tape
• CGSA — Cellular Geographic Service Area
• PDN — Packet Data Network
• LEC — Local Exchange Carrier
• LD — Laser Diode
• ER — Extended Range
• FEP — Front-End Processor
• VG — Voice Grade
• FEC — Forward Error Correction
• RMI — Remote Method Invocation
• DTD — Document Type Definition (XML)
• FWA — Fixed Wireless Access
• COPS — Common Open Policy Service
• DMI — Distributed Management Interface
• GHZ — Gigahertz
• DII — Dynamic Invocation Interface
• EMCON — Electromagnetic Emission Control
• S/D — Source/Drain
• ASEAN — Association of South East Asian Nations
• HDSL — High-bit-rate Digital Subscriber Line

• P — Priority
• MPEG — Motion Picture Experts Group
• ORB — Object Request Broker
• SQ — Service Quality
• DAP — Distributed Array Processor
• BOFH — Bastard Operator From Hell
• SN — Stock Number
• FLM — First Line Maintenance
• PVC — Permanent Virtual Connection
• DER — Distinguished Encoding Rules
• BJT — Bipolar Junction Transistor
• EC — European Community
• MBPS — Megabits per second
• ACAP — Application Configuration Access Protocol
• COMDEX — Computer Dealers Exposition
• XPS — X-Ray Photoelectron Spectroscopy
• WE — Western Electric
• SDU — Signal Distribution Unit
• SSRC — Synchronization Source
• NCSA — National Center for Supercomputing Applications
• STD — Subscriber Trunk Dialing
• AC — Area Code
• STP — standard temperature and pressure (0° and 1 atm)
• IPS — InPlane Switching
• BSS — Base Station System
• TTY — Text Teletype
• SLIC — Subscriber Line Interface Circuit
• CSPDN — Circuit Switched Public Data Network
• IMC — Intermediate Metal Conduit
• LATA — Local Access and Transport Area
• SD — Speed Dial
• DDN — U.S. Defense Data Network
• AOL — America on line
• HEX — Hexadecimal (base 16)
• JCL — Job Control Language
• CFV — Call For Vote(s)
• WAIS — Wide Area Information Server
• TAM — Telephone Answering Machine
• RNX — Restricted Numeric eXchange
• ISOC — Internet Society
• BA — Behaviour Aggregate
• ETF — Early Termination Fee
• PROM — Programmable Read-Only Memory
• EIGRP — Enhanced Interior Gateway Routing Protocol
• IRC — International Record Carrier
• DMS — Data Management System
• FOSE — Federal Office Systems Exposition
• BSA — Business Software Alliance
• GMRS — General Mobile Radio Service
• DPL — Digital Private-Line

• DII — Defense Information Infrastructure
• WHT — Walsh-Hadamard Transform
• IEEE — Institute of Electrical and Electronics Engineers
• VOC — Volatile Organic Compounds (air pollution)
• NSS — Network Switching Subsystem
• E — Electra
• IMP — Interface Message Processor
• AP — Action Point
• DCE — Data Communication Equipment
• WINS — Windows Internet Name Service
• DPDU — Data Protocol Data Unit
• ADT — American District Telegraph Company
• BIS — Business Information System
• MH — Message Handler
• CVR — Crystal Video Receiver
• SPIN — Service Provider Identification Number
• CPN — Cisco Powered Network
• BMEWS — Ballistic Missile Early Warning System (bee-mews)
• COAX — Coaxial
• IOC — Inter-Office Channel
• AN — Access Node
• CP — Call Processing
• WDN — Wireless Developer Network
• JTF — Joint Task Force
• DCMI — Dublin Core Metadata Initiative (Online Computer Library Center)
• VF — Voice Frequency
• CT — Computer Terminal
• EU — End User
• SN — Service Number
• CBEMA — Computer & Business Equipment Manufacturers Association
• ISAKMP — Internet Security Association and Key Management Protocol
• IMEI — International Mobile Equipment Identity
• CDE — Common Desktop Environment
• MLP — Mobile Location Protocol
• MTS — Message Transfer System
• CE — Channel Element
• CS — Central Station
• IAT — Integrated Access Terminal
• WAYP — White and Yellow Pages
• CIS — Computer and Information Science
• DOT — Department of Telecommunications (India)
• CI — Common Interface
• BMS — Business Management System
• VAS — Value Added Services
• HFC — Hybrid Fiber/Coaxial network
• FXS — Foreign Exchange Subscriber
• CGA — Color Graphics Adapter
• SIA — Securities Industry Association
• TKIP — Temporal Key Integrity Protocol
• SM — Service Module

• ASA — Acoustical Society of America
• CPS — characters per second
• JRE — Java Runtime Environment
• DDD — Direct Distance Dialing
• CAM — Common Access Method
• TDD — Time Division Duplex
• TDMA — Time Division Multiple Access
• LISP — List Processing Language
• TRS — Telecommunications Relay Service
• FITL — Fiber-In-The-Loop
• RTC — Real-Time Control
• PCI — Personal Computer Interface
• B-ISDN — Broadband Integrated Services Digital Network
• CIP — Carrier Identification Parameter
• LNP — Local Number Portability
• AFOSR — Air Force Office Of Scientific Research(USA)
• AIF — Audio Interchange Format
• 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
• VMS — Virtual Memory System
• ADC — Administration Center
• RCC — Radio Common Carrier
• EIA — Extended Interaction Amplifier
• PEM — Privacy-Enhanced Mail
• RCS — Radar Cross Section
• OTDOA — Observed Time Difference of Arrival
• DNS — Domain Name Service
• DN — Distinguished Name
• MA — Maintenance Action
• AP — access point
• NFPA — National Fire Protection Association
• AWT — Agence Wallonne des Télécommunications
• TAX — Trunk Automatic Exchange
• DM — Domain Model
• T — Temperature
• RDS — Rate Determining Step
• TELECOMMUTE — Telecommuting
• ACP — Access Control Point
• SWAP — Shared Wireless Access Protocol
• FDTD — Finite Difference Time Domain
• CAL — Calorie
• OSP — Outside Plant
• DVB — Digital Video Broadcasting
• ADN — Abbreviated Dialing Number
• SCU — System Control Unit
• OSS — Operations Support System
• FH — Frequency Hopping
• 3GPP — Third Generation Partnership Project
• SPD — Serial Presence Detect
• TUR — Trunk Utilization Report
• AWACS — Airborne Warning And Control System

• CP — Change Proposal
• LASA — Large Aperture Seismic Array
• FEXT — Far-End Cross Talk
• 1FB — Single line, Flat Business rate;
• TSO — Telecommunications Service Order
• NRPB — National Radiological Protection Board
• SAR — synthetic aperture radar (satellite)
• GDM — GSM (Global System for Mobile communications) Data Module
• EOB — End Of Business
• DC — Device Control
• WAR — Weekly Activity Report
• SAF — System Access Fee
• C — Collector
• DGPT — Directorate General of Posts and Telecommunications
• VBR — Variable Bit Rate (ATM)
• MBWA — Mobile Broadband Wireless Access
• DHD — Dial Home Device
• SSM — Synchronization Status Message
• BTAM — Basic Telecommunications Access Method
• OTA — Office of Technology Assessment (U.S.; abolished by Congress, Fall 1995)
• COO — Cell of Origin
• SRR — Search and Rescue Region
• TL1 — Transaction Language 1
• V — Variable
• FTTC — Fiber To The Curb光纤到路边
• VLSI — Very-Large-Scale Integration
• IRTF — Internet Research Task Force
• RRN — Routing Recording Number
• IRQ — Interrupt Request
• ALT — Accelerated Life Test
• NIMBY — Not In My Back Yard
• PP — Polypropylene
• DUA — Directory User Agent
• ACT — ACTIVITY, ACTIVITIES
• EMR — Electromechanical Relay
• NCP — Network Control Protocol
• DTN — Data Transfer Network
• TRS — Trunked Radio Systems
• RDI — Remote Defect Indicator (UNI Fault Management)
• DSS — Digital Signature Standard
• RADIUS — Remote Authentication Dial-In User Service
• CONUS — Contiguous United States
• BCH — Bose-Chaudhuri-Hocquenghem Coding
• KDC — Kerberos Key Distribution Center
• ASD — Alternative Service Delivery
• DCA — Dynamic Channel Assignment
• VPI — Virtual Path Identifier
• RAU — Remote Access Unit
• SDM — Service Delivery Management
• BER — Basic Encoding Rules (ASN.1)

• CMC — Career Management Center
• ADB — Apple Desktop Bus
• VTS — Vessel Traffic Service
• OML — Object Model Library
• NIU — Network Interface Unit
• TCIC — Trunk Circuit Identification Code
• GBT — Ground Based Tower
• YAHOO — You Are Hazy Over Oranges
• MPI — Minimum Picture Interval
• IPS — Instructions Per Second
• SSM — Spread Spectrum Modulation
• DSN — Defense Switched Network
• HLR — Home Location Register
• FRAD — Frame Relay Access Device
• LOO — Likelihood of Occurrence
• COT — Central Office Terminal
• SIL — Solid Immersion Lens
• C3I — Command, Control, Communications & Intelligence
• EDC — Electronic Dispersion Compensator
• AAV — Accountholder Authentication Value
• TEL — Telephone
• DPSK — Differential Phase Shift Keying
• NDVI — Normalized Difference Vegetation Index
• TFTP — Trivial File Transfer Protocol (ATM)
• UML — Unified Modeling Language (Object Management Group, OMG)
• ACC — Area Control Center
• SNA — System Network Architecture
• QI — Quality Indicator
• MC — Maintenance Control
• ET — Electronic Transmission
• JDK — Java Development Kit
• DDU — Disk Drive Unit
• RSL — Restricted Service License
• AVR — Automated Voice Response
• CMRS — Commercial Mobile Radio Service
• RJE — Remote Job Entry
• NF — Noise Factor
• NAT — Network Address Translation
• CDM — Conceptual Data Model
• SOS — Save Our Souls (Help!)
• IAB — Internet Architecture Board
• VXML — Voice eXtensible Markup Language
• MPLS — Multi Protocol Label Switching
• NSAI — National Standards Authority of Ireland
• DCS — Data Collection System (NOAA Polar Orbiting Satellites)
• BHCA — Busy Hour Call Attempt
• DDCMP — Digital Data Communications Message Protocol
• DEMUX — Demultiplexer
• EST — Establish
• ACSE — Association Control Service Element

• CND — Calling Number Display
• BSI — British Standards Institution
• IPM — Inches Per Minute
• RACH — Random Access Channel
• AOS — Alternate Operator Service
• CMIP — Common Management Information Protocol (ATM)
• PMT — Program Management Team
• ALB — Analog Loopback
• CIAC — Computer Incident Advisory Capability
• SIM — Subscriber Identification Module
• CIP — Channel Interface Processor
• OOP — Object-Oriented Programming
• DTI — Digital Trunk Interface
• APDU — Application Protocol Data Units
• IESG — Internet Engineering Steering Group
• RMS — Resource Management System
• VBA — Visual BASIC for Applications
• MLM — Multi-Longitudinal Mode
• CRTS — Cellular Radio Telecommunications Service
• CAMA — Centralized Automatic Message Accounting
• APN — An Access Point Name
• LANE — Local Area Network Emulation
• ST — Such That
• AMSS — Automatic Message Switching System
• POP — Post Office Protocol
• DL — Definition List
• PAM — Payload Assist Module
• DSI — Digital Speech Interpolation
• DVMRP — Distance Vector Multicast Routing Protocol
• EA — Extended Address Field Bit
• NOAO — National Optical Astronomy Observatories (Tucson, AZ)
• TC — Transmission Convergence (ATM)
• AMPS — Advanced Mobile Phone Service (cellular phone standard)
• COMINT — Communications Intelligence
• LRC — Longitudinal Redundancy Check
• EIR — Equipment Identity Register
• SMDS — Switched Multimegabit Data Service (ATM)
• BLER — Block Error Rate
• FOD — Fax on Demand
• SKU — Stockkeeping Unit
• BOSS — Binary Object Storage System
• NAK — Negative Acknowledge
• CIRC — Cross-Interleaved Reed-Solomon Code
• SDP — Software Development Plan
• ACA — Adaptive Channel Allocation
• CLETS — California Law Enforcement Telecommunication System
• OT — Office of Telecommunications
• DDI — Direct Dialing Incoming
• ADP — Automatic Data Processor
• ILD — International Long Distance

• FMC — Fixed Mobile Convergence "Mobile UC or Unified Communications over Wireless"
• REPT — Report
• ABM — Asynchronous Balanced Mode
• RISC — Reduced Instruction Set Computing
• LDN — Local Directory Number
• CLK — Clock
• FGD — Feature Group D
• 3-D — 3-Dimensional
• LS — Loop Start
• FAC — Forced Authorization Code
• CNG — comfort noise generation
• CODEC — Coder/decoder
• EMS — Element Management System (ATM)
• DTAP — Direct Transfer Application Process
• CRLF — Carriage-Return Line-Feed
• LRC — Learning Resource Center
• SITA — Société Internationale de Télécommunications Aéronautiques
• IAD — Integrated Access Device
• GI — Graded-Index
• INSAT — Indian National Satellite
• BLOS — Beyond Line-Of-Sight
• ILEC — Incumbent Local Exchange Carrier
• NTDS — Naval Tactical Data System
• MP — Modulation Parameter
• RXQUAL — Received Signal Quality
• 2G — Second Generation Wireless Systems
• LIF — Logical Interchange Format
• EMI — Electro-Magnetic Interference
• DIS — Draft International Standard
• MA — Message Analysis
• PACS — Personal Access Communications System
• ARSR — Air Route Surveillance Radar
• ALOC — Average Length Of Call
• RQMT — Requirement
• FDI — Feeder Distribution Interface
• L2TPV3 — Layer 2 Tunneling Protocol Version 3
• RAU — Radio Access Unit (Army)
• MCC — Mission Control Center (JSC)
• CRB — Cramer-Rao Bound
• BAN — Building Area Network
• SCPC — single channel per carrier
• AMPS — Advanced Mobile Phone System
• NAS — Network-Attached Storage
• SMB — Server Message Block
• RMON — Remote Monitoring
• EBIC — Electron Beam Induced Current
• FGA — Feature Group A
• CAC — Connection Admission Control (Asynchronous Transfer Mode)
• PET — positron emission tomography
• FDD — Frequency Division Duplex

• DSCP — Differentiated Services Code Point
• DISN — Defense Information Systems Network
• FCA — Fixed Channel Allocation
• EBCDIC — Extended Binary-Coded Decimal Interchange Code
• 3G — 3rd Generation Wireless Format
• DM — Differential Mode
• IG — Interface Group
• UDP — Up Down Pair
• VLAN — Virtual Local Area Network
• MSW — Most Significant Word
• ATS — Automatic Transfer Switch
• VPA — Valid Peripheral Address
• UART — Universal Asynchronous Receiver/Transmitter
• MHO — My Humble Opinion
• LPD — Low Probability of Detection
• ALI — Automatic Location Information
• AWG — arrayed waveguide grating
• CLDC — Connected Limited Device Configuration
• CRV — Call Reference Value
• ICL — Inserted Connection Loss
• EULA — End User License Agreement (usually in reference to software)
• POE — power over ethernetinjector
• CMA — Communications Management Association
• HSPA — High Speed Packet Access
• RPV — Remotely Piloted Vehicle
• 4GL — Fourth-Generation Language
• NII — National Information Infrastructure (USA)
• ISG — Information Systems Group
• UMA — Unlicensed Mobile Access
• ADC — Access Deficit Charge
• CCIR — International Radio Consultative Committee (French Acronym)
• INE — Intelligent Network Element
• TIA — Telecommunications Industry Association
• E — Echo Time Zone
• TCB — Telecommunication Certification Body
• CALEA — Communications Assistance for Law Enforcement Act
• KSU — Key Service Unit
• OD — Outside Diameter
• CPC — Calling Party Control
• BOM — Bit-Oriented Message
• DPT — Dynamic Packet Transport
• NE — North-East
• CAVE — Cellular Authentication and Voice Encryption Algorithm
• ASAR — Advanced Synthetic Aperture Radar 
• DLP — Data Link Processor
• BSC — Bi-Synchronous Communications
• MCP — Microsoft Certified Professional
• LSI — Large Scale Integration -> VLSI
• RICK — Repeater Interface Communications Kit
• SISIR — Singapore Institute of Standards and Industrial Research

• CCCH — Common Control Channel
• SDSL — Symmetric Digital Subscriber Line
• EBS — Electron Bombarded Silicon
• TXM — Transmission X-ray Microscope
• CNG — Fax Calling Tone
• LSW — Least Significant Word
• CIC — Carrier Identification Code
• CCR — Customer Controlled Reconfiguration (Sprint)
• CMOS — Complementary Metal Oxide Semiconductors
• ITT — Invitation To Tender
• RDT — Recall Dial Tone
• 4W — Four-Wire
• CPG — Converged Packet Gateway
• ISI — Intersymbol Interference
• TOP — technical/office protocol
• CHTML — Compact Hypertext Markup Language
• SVC — Switched Virtual Circuit (ATM)
• CCNA — Cisco Certified Network Associated
• ECM — Error Correction Model
• SIP — Session Initiation Protocol
• ASN.1 — Abstract Syntax Notation 1
• WSDL — Web Services Description Language
• LCR — Least Cost Routing
• AF — Assured Forwarding
• EVA — Electronic Video Agent
• SN — Switching Network
• COC — Central Office Connection
• TT — Text-Telephone
• GAN — Global Area Network
• SWBD — Switchboard
• DRFM — Digital Radio-Frequency Memory
• HSCSD — High-Speed Circuit-Switched Data
• VHSIC — Very High-Speed Integrated Circuit
• DXC — Digital Cross Connect
• OMF — Object Management Framework
• WARC — World Administrative Radio Conference
• TTY — teletype terminal
• NCF — Network Control Facility
• VN — Virtual Network
• RSS — Radio Service Software (Motorola)
• NC — Network Channel
• SLAM — Scanning Laser Acoustic Microscope
• TCA — Threshold Crossing Alert
• CFNRY — Call Forwarding on No Reply
• DPCM — differential pulse code modulation
• BIS — Brought Into Service
• ARM — Asynchronous Response Mode
• FNN — Full National Number
• OMA — Open Mobile Alliance
• DARTS — Design Approach for Real-Time Systems

• TEI — Terminal Endpoint Identifier
• IR — International Roaming
• TD — Transmit Data
• VESA — Video Electronics Standards Association
• EDFA — Erbium-Doped Fiber Amplifier
• FECN — Forward Explicit Congestion Notification (ATM)
• AAS — advanced automation system (FAA)
• WVOIP — Wireless Voice over Internet Protocol
• UMTS — Universal Mobile Telecommunications Service
• EEROM — Electronically Erasable Read-Only Memory
• VPWS — Virtual Private Wire Service
• ASYNC — Asynchronous
• TOMS — Total Ozone Mapping Spectrometer (satellite Instrument)
• MGC — Multimedia Gateway Controller
• CACH — Call Appearance Call Handling
• TDD — Telecommunications Device for the Deaf
• IRF — Impulse Response Function
• CV — Coding Violation
• CRBT — Caller Ring Back Tone
• CTI — Computer Telephony Integration
• MR — Mobile Router
• CIP — Continuous Improvement Program
• FC — Frame Control
• RSS — root-sum-square
• CCP — Compression Control Protocol
• BCDIC — Binary Coded Decimal Interchange Code
• FMR — Follow Me Roaming
• ASN.1 — Abstract Syntax Notation One
• SSN — Switched Service Network
• RGN — Region
• SCR — Sustainable Cell Rate
• FSK — Frequency Shift Keying
• TIFF — Tag Image File Format
• ULL — Unbundled Local Loop
• 4G — Fourth Generation Wireless Systems
• AAL5 — ATM (Asynchronous Transmission Mode) Adaptation Layer 5
• FTAM — File Transfer Access and Management
• LT — Line Termination
• YABA — Yet Another Bloody Acronym
• BT — Burst Tolerance
• FEA — Finite Element Analysis
• DCAS — Downloadable Conditional Access System
• SMPTE — Society of Motion Picture and Television Engineers, Inc.
• SE — Southeast
• SMS — Service Management System
• RDBMS — Relational Data Base Management System (Oracle)
• WFA — Wait for Answer
• DISA — U.S. Defense Information Systems Agency
• LDP — Label Distribution Protocol
• NREN — National Research and Education Network

• DAC — Digital-To-Analog Converter
• PDL — Positioning Data Link
• ESCA — photoelectron spectroscopy for chemical analysis
• IPVX — Internet Protocol version X
• OBC — Onboard Computer
• SRL — Singing Return Loss
• DOD — Direct Outward Dialing
• IDF — Independent Distribution Frame
• OSF — Open Software Foundation
• CPS — Cycles Per Second (now Hertz)
• NDS — Novell Directory Services
• SSMA — Spread-Spectrum Multiple Access
• AUI — Attachment Unit Interface
• IMAP — Internet Mail Access Protocol
• TTYL — Type To You Later
• TU — Transmission Unit
• USA — Underground Service Alert
• CICS — Customer Information Control System (IBM Mainframe Software; Kicks Or C-I-C-S)
• DNSIX — Defense Network Security Information Exchange
• VRML — Virtual Reality Modeling Language
• MAJ — Major
• VSAM — Virtual Storage Access Method
• ESCON — Enterprise System Connection
• STN — Station
• UAT — Universal Access Transceiver
• MIS — Management Information Service
• SONET — Synchronous Optical Network
• MSRN — Mobile Station Roaming Number
• FI — Format Identifier
• PUK — PIN (Personal Identification Number) Unlocking Key
• WTS — Wireless Telecommunications Symposium
• RCU — Radio Control Unit
• ABBR — Abbreviation
• INTELSAT — International Telecommunications Satellite
• VLSI — Very Large-Scale Integration
• TCP/IP — Transmission Control/Internet Protocol
• MSDP — Multicast Source Discovery Protocol
• VSAT — Very Small-Aperture Terminal
• CID — Craft Interface Device
• DACS — Digital Access Cross-connect System
• PNP — Plug-and-Play
• FOIP — Fax Over Internet Protocol
• 1-ESS — x-ESS series of Electronic Switching Systems
• TACSAT — Tactical Satellite
• 3GPP — Third-Generation Partnership Project
• PSN — Packet Switched Network
• IEEE-CS — Institute of Electrical and Electronics Engineers Computer Society
• FSAI — Fiber Serving Area Interface
• RCP — Right-Hand Circular Polarization
• DPA — Distributed-Power Architecture

• ADM — Administration Building
• DA — deca
• LH — Link Handler
• ERL — Echo Return Loss
• VTAM — Virtual Telecommunication Access Method
• ACF — Advanced Communications Function (IBM)
• NRP — Network Resource Planning
• CRS — Cell Relay Service
• ANC — Access Network Controller
• F — Frequency
• IPCP — Internet Protocol Control Protocol
• DLCI — data link connection identifier
• DXF — Data Exchange Format
• VCI — Virtual Channel Identifier
• ATS — Abstract Test Suite
• DTU — Data Transfer Unit
• ETN — Electronic Tandem Network
• CSU — Channel Service Unit
• WDA — Wireless Digital Assistant
• RADIUS — Remote Authentication dial In User Service
• LB — Local Battery
• TLT — Test Loop Translator
• PARC — Palo Alto Research Center
• RX — Receive
• WORM — Write-Once, Read-Many
• DPDT — Double-Pole Double-Throw
• ASTD — American Society of Training and Development (Alexandria, Virginia)
• CCNA — Cisco Certified Network Administrator
• PD — Pulse Duration
• DCF — Distributed Coordination Function
• CPE — Customer Premise Equipment
• PBT — Polybutylene Terephthalate
• BELLCORE — Bell Communications Research, Inc.
• LAG — Link Aggregation Group
• FTTK — Fibre To The Kerb
• MMM — Mobile Media Mode
• VCC — Virtual Channel Connection (ATM)
• PTT — Push to Talk Technology
• PLL — Phase Locked Loop
• DIL — Direct Inward Line
• MMDS — Multichannel Multipoint Distribution Service
• RDMA — Remote Direct Memory Access
• 3G — Third Generation (mobile communication system)
• CC — Composite Clock (SONET)
• STMR — Sidetone Masking Rating (telecommunications)
• NCC — Network Control Center (GSFC)
• DTE — Digital Terminal Equipment
• DIV — Divisionsion
• 2G — Second generation cellular
• CTIA — Cellular Telecommunications Industry Association

• CON — Concentrator
• MF — Multiple Frequency
• BATM — Basic Telecommunication Access Method
• WSFL — Web Services Flow Language
• B2B — Business-to-Business
• SCM — Single-Carrier Modulation
• CODASYL — COnference on DAta SYstems Languages
• TBCD — Telephony Binary Coded Decimal
• CPH — Call Party Handling
• 4WAI — Four-Wire Analog Interface
• MFC — Multi-Frequency Code
• CSR — Customer Service Report
• LI — Length Indicator
• DFG — difference-frequency generation
• LIDB — Line Information DataBase
• PCCA — Portable Computer Communications Association
• UPT — Universal Personal Telecommunications
• SS1 — Signalling System 1 (500/20 Hz tones)
• BY — Busy
• PIC — Programmable Interrupt Controller
• GS — Ground Start
• ISO — Independent System Operator (US) (see also TSO) Responsible for grid management, but does not own assets. (electricity)
• VDR — Voice Digitization Rate
• ATS — Air Traffic Services
• YA — Yet Another
• IEEE-SA — Institute of Electrical and Electronics Engineers - Standards Association
• SYM — Symmetric
• CPOP — Circuit Precedence Over Packet data
• RP — Radio Port
• ADPC — Automatic Data Processing Center
• OMP — Open Management Platform
• OSA — Open System Architecture
• DE — Discard Eligibility (ATM)
• EGSM — Extended Global System for Mobile Communications
• GBPS — Gigabits per second
• RDT — Remote Digital Terminal
• PTP — Point to Point Transmission Service (electricity)
• ASE — Application Service Element
• EMF — Event Management Framework
• CC — Country Code
• CSIRO — Commonwealth Scientific and Industrial Research Organization
• EM — Element Manager
• FCA — Free Carrier Alongside
• WAE — Wireless Application Environment
• SCR — System Change Request
• GDK — GIMP (GNU Image Manipulation Program) Drawing Kit
• CTO — Commonwealth Telecommunications Organisation
• DQDB — Distributed Queue Dual Bus
• VR — Virtual Router
• CLCC — Ceramic Leaded Chip Carrier

• VOB — Versioned Object Base
• EMS — Enhanced Messaging Service
• DTL — Defense Telephone Link
• CRBT — Color Ring Back Tone
• CVD — Chemical Vapor Deposition
• DPBX — Digital Private Branch Exchange
• VNS — Virtual Network System
• IPLC — International Private Leased Circuit
• FDOA — Frequency Difference Of Arrival
• TBPS — Terabits Per Second
• VSM — Vestigial Sideband Modulation
• CPAP — Customer Premises Access Profile
• DAS — Data Acquisition System
• LIS — Lightning Imaging Sensor
• ESPN — Entertainment and Sports Programming Network
• RECON — Reconnaissance
• ANSI-41 — ANSI standard for mobile management
• GERAN — GSM (Global System for Mobile communications) Edge Radio Access Network
• ET — Exchange Terminal
• TCC — Transmission Control Code
• TP — Termination Point
• VPX — Virtual Path Cross-Connect
• WSA — Wireless Security Auditor
• FPS — Framing Pattern Sequence
• ADCCP — Advanced Data Communication Control Procedures
• SPID — Service Profile Identifier
• SETI — Search for Extraterrestrial Intelligence
• CLD — Cross-Layer Design
• CAPTAIN — Character And Pattern Telephone Access Information Network
• LCF — Location Confirm
• TNI — Telephone Network Interface
• HTML — Hyper-Text Markup Language
• BAF — Bellcore AMA (Automatic Message Accounting) Format
• LRM — Long Reach Multimode
• PDSO — Packet Data Security Overlay
• USF — Universal Service Fund
• DRQ — Disengage Request
• EDSX — Electronic Digital Signal Cross-Connect
• SAT — Satellite
• PSDN — Public Switched Digital Network
• RLU — Remote Line Unit
• SSP — Security Service Provider
• CAR — committed access rate
• LIM — Line Isolation Monitor
• LCP — Local Control Point
• MTA — Message Transfer Agents (Internet)
• FMS — Fixed Mobile Substitution
• AMR — Automated meter reading also known as Automatic Meter Reading
• RFR — Radio Frequency Radiation
• ARFA — Allied Radio Frequency Agency

• WIN — Wireless Intelligent Network
• TP — Transition Point
• OWS — Operator Work Station
• CTE — Computer Telephony Engineer
• CES — Circuit Emulation Service
• AT — Attenuation
• L2TP — Layer 2 Tunneling Protocol
• UCF — Unregistration Confirm
• PTP — Point To point Protocol
• RIPE NCC — Reseaux IP Europeens Network Coordination Centre
• VOB — Voice Over Broadband
• TSC — Test System Controller
• MTI — Moving Target Indicator
• FTTP — Fiber To The Premises
• CSA — Canadian Standards Association (like UL)
• EFCI — Explicit Forward Congestion Indication (ATM)
• GSM — Groupe Speciale Mobile
• HFC — Hybrid Fiber Coaxial
• SSAP — Source Service Access Point
• TDWR — Terminal Doppler Weather Radar
• SDP — Session Description Protocol
• SCH — Synchronization Channel
• LLA — Link Level Access
• FIOS — Fiber Optic Services
• CDV — Cell Delay Variation(ATM)
• IBSS — Independent Basic Service Set
• BNC — Bayonet Neill-Concelman
• PLCP — Physical Layer Convergence Procedure
• AMA — automatic message accounting
• DICOM — Digital Imaging and Communications in Medicine
• BUFR — Binary Universal Form for the Representation (of data)
• NCAR — National Center for Atmospheric Research (US)
• IPRC — Intellectual Property Rights Committee
• SCCS — Switching Control Center System
• MGCP — Multimedia Gateway Control Protocol
• PJC — Pointer Justification Count
• DSSSL — Document Style Semantics and Specification Language
• SPA — Special Prorate Agreement
• QS — Quasi-Synchronous
• TCM — Time Compression Multiplexer
• MTD — Moving Target Detection
• COFA — Change Of Frame Alignment
• IWF — Interworking Function
• BSA — Basic Service Area
• TP — Telephone Pole
• ENV — Environment
• SMI — Structure of Management Information
• SIMT — Système interbancaire marocain de télécompensation
• DMT — Discrete Multi-Tone Technology
• PTT — Push to Talk Taster

• TDRSS — Tracking and Data Relay Satellite System
• BASIZE — Buffer Allocation Size
• DOCSIS — Data over Cable Service Interface Specification
• CCITT — Comit? Consultatif International T?l?graphique et T?l?phonique
• BIND — Berkeley Internet Name Domain
• NE — Network Element
• FAT — Final Acceptance Testing
• ACF — Access Coordination Function
• LCAS — Link Capacity Adjustment Scheme
• VQV — Voice Quality Value
• LBR — Low Bit Rate
• ATD — Advanced Technology Demonstration
• TTL — ToS and Time-to-Live
• MPU — Main Processor Unit
• ELFEXT — Equal-Level Far-End Cross-Talk
• TACACS — Terminal Access Controller Access Control System
• 4 GIG — 4 Giga Intellectual Gadget
• ECS — Encryption Control Signal
• BP — Block Parity
• CDM — Configuration Data Manager
• ESN — Electronic Serial Number
• WK — Week
• ECS — Environmental Control System (Subsystem)
• LAAS — Local Area Augmentation System
• TRMM — Tropical Rainfall Measuring Mission (US-Japan)
• 4WA — Four Wire Analog
• CERN — Conseil Europeen Pour La Recherche Nucleaire
• WNMS — Wireless Network Management System
• DDM — Data Distribution Manager
• CDVT — Cell Delay Variation Tolerance
• NCP — Network Control Program
• ATU-C — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Central office end
• X — X Window System
• DMS — Defense Messaging System
• LN — Line
• SDNS — Secure Data Network System
• BDE — Borland Database Engine
• DAC — Digital to Analog Converter-Audio
• WFG — Wireless Firewall Gateway
• 3G HSPA — Third-Generation High-Speed Packet Access
• MLA — Modern Language Association
• CT — Cordless Telecommunications
• MAP — Mobile Application Part
• LFACS — Loop Facility Assignment and Control System
• CBMS — Computer-Based Message System
• URN — Uniform Resource Namespace
• NSAP — Network Service Access Point
• CIS — Center for Integrated Systems
• ADTM — Asynchronous Data Transfer Mode
• BAM — Basic Access Module

• NT — New Technology, also Windows NT
• P&A — Privacy and Authentication
• ALI — Automatic Location Identifier
• S/N — Signal-to-Noise ratio
• B8ZS — Binary Eight Zero Substitution
• WCDMA — Wideband Code Division Multiple Access
• MITI — Ministry of International Trade and Industry
• BSID — Base Station Identity
• IDCU — Integrated Digital Carrier Unit
• SCC — Specialized Common Carrier
• CLEC — Competitive Local Exchange Carrier
• DOD — Dial on Demand
• RTC — Right to Carry
• CDA — Communications Decency Act's
• CSP — Converged Service Platform
• NMC — Network Management Center
• TCS — Telephony Control Specification
• LXT — Local Exchange Terminal
• DPST — Double-Pole Single-Throw
• PY — person-year
• L2F — Layer 2 Forwarding protocol
• CCA — Carrier-Controlled Approach
• AAL — ATM (Asynchronous Transmission Mode) Adaptive Layer
• DDSN — Digital Derived Services Network
• SQL — Specified Quality Level
• IVP — Integrated Voice Protocol
• BPSK — Binary Phase-shift Keying
• SRA — Seamless Rate Adaptation
• MUSIC — MUltiple SIgnal Classification
• MTP — Message Transfer Part
• TLP — Transmission Level Point
• APPC — Advanced Program-to Program Communications
• TM — Thematic Mapper (Landsat)
• DMT — Discrete Multi-tone Transmission
• LSC — Link State Control
• DLL — Digital Local Line
• PNP — Positive-Negative-Positive
• BNCC — Base Network Control Center
• CCCI — Command, Control, Communications and Intelligence
• TSDU — Transport Service Data Unit
• DW — Deep Water
• DNA — Do Not Answer
• DL — Downlink Message
• AAP — Alternate Access Provider
• UBR — Unspecified Bit Rate
• SMSC — Short Message Service Center
• AAV — Alternate Access Vendor
• RADINT — Radar Intelligence
• HDTV — High-Definition Television
• LRQ — Location Request

• PLE — Path Length Efficiency
• AMOLED — Active Matrix Organic Light-Emitting Diode
• TDM — Time Division Multiplexing
• CAM — Computer-Aided Manufacturing
• RRC — Root Raised-Cosine
• MMC — Microsoft Management Console (Microsoft)
• TELNET — Telecommunications Network Protocol
• NDIS — Network Driver Interface Specification (Microsoft Windows NT)
• ACM — Address Complete Message
• DSCS — Defense Satellite Communication System
• HSCSWD — High-Speed Circuit-SWitched Data
• P2P — Person-to-Person
• FEM — Finite Element Method
• MSC — Mobile Switching Center
• SMS — System Management Server
• LCGN — Logical Channel Group Number
• PIM — Protocol Independent Multicast
• VFL — Visual Fault Locator
• CDSL — Consumer Digital Subscriber Line
• AI — Adapter Interface
• CSR — Customer Service Request
• FMS — Fraud Management System
• RPCU — Radio Port Control Unit
• STU — Secure Telephone Unit
• MFLOPS — Millions of Floating Point Operations per Second
• DCS — Defense Communications System
• VISSR — visible and infrared spin scan radiometer (GOES)
• GLT — Great Lakes Telecom
• PTT — Push to Talk Testing
• CM — Connection Manager
• FIFO — first-in, first-out
• COAM — Customer Owned And Maintained
• DXI — Data Exchange Interface
• NW — North West
• SPE — Synchronous Payload Envelope
• TPS — Telephone Preference Service
• RAD — Recorded Announcement Device
• FR — Functional Requirement
• DPNSS — Digital Private Network Signaling System
• DBRNC — deciBel Relative to Noise in a Circuit
• VCA — Voice Connecting Arrangement
• WNAP — Wireless Network Access Point
• VLF — Vertical-Laminar-Flow
• TDR — Time-Domain Reflectometry
• AMTI — Airborne Moving Target Indicator
• SCE — Service Creation Environment
• LSAP — Link Service Access Point
• CNID — Calling Number Identification Display
• LORAN — Long Range Aid to Navigation System
• DMT — Discrete Multi-Tone

• FOC — Fiber-Optic Cable
• LR-WPAN — Low-Rate Wireless Personal Area Network
• MCR — Minimum Cell Rate (ATM)
• TRIG — Trigger
• SFX — Special Effects
• 100VG — 100 Voice Grade (IEEE 802.12 AnyLAN Standard)
• BT — Back Trace
• OSD — Onscreen Display
• DECCO — DISA Defense Commercial Communications Office
• HPN — Home Phone Network
• RQMTS — Requirements
• N-AMPS — Narrowband Advanced Mobile Phone System
• SINAD — SIgnal-to-(Noise And Distortion) ratio
• DS0 — Digital Signal Zero
• COBE — Corporate Owned Business Only
• DS-3 — Digital Signal, Level 3
• NFR — Near-Field Recording
• DDU — Digital Data Unit
• MAG — Mobile Access Gateway
• B-CPE — Broadband Customer Premises Equipment
• BDFB — Battery Distribution Feeder Bay
• IDLC — Integrated Digital Loop Carrier
• CSCW — Computer-Supported Cooperative Work
• LMS — Location and Monitoring Service
• NTU — Network Termination Unit
• AFPS — Automatic Facility Protection Switching
• VSC — Vertical Service Code
• BT — Bluetooth Tablet
• B-ISDN — Broadband ISDN
• SMMR — Scanning Multichannel Microwave Radiometer
• CSAR — Combat Search and Rescue
• UCM — Use Case Map
• LP — Line Pair
• SA — Selective Availability (on GPS transmissions)
• FEAC — Far End Alarm and Control
• TOC — Telecommunication Operations Center
• NWK — Network
• STM — Synchronous Transfer Mode
• ALCAP — Access Link Control Application Protocol
• D3 — Digital channel bank, Third generation
• OCC — Occupancy
• CEPT — Conférence Européenne des Administrations des Postes et des Télécommunications
• WFA — Work Force Administration
• CPT — Cellular Paging Teleservice
• IDCP — Internet Device Control Protocol
• GMSS — Global Mobile Satellite System
• COP — Character Oriented Protocol
• TCPA — Telephone Consumer Protection Act
• DECT — Digital Enhanced Cordless Telecommunication
• FGDC — Federal Geographic Data Committee's

• UTL — Utility
• WTNM — Working Telephone Number Management
• SAR — Segmentation and Reassembly (ATM)
• CGI — Cell Global Identity
• RJ-14 — Registered Jack type 14 (2-wire connector)
• UNI — User-Network Interface
• ADPCM — Adaptive Differential Pulse Code Modulation
• VO — Voice Only
• NCOS — Network Class Of Service
• IV&V — independent verification and validation
• Z — Zulu Time
• EA — expedited acknowledgement
• EV — electronvolt
• GSTN — General Switched Telephone Network
• BSS — Broadband Switching System
• SFN — Single Frequency Network
• LULT — Line Unit/Line Termination
• PCS — Personal Communications Services
• AMTFT — Active Matrix Thin Film Transistor
• CFOT — Certified Fiber-Optic Technician
• DUN — Dial-Up Networking
• XWI — XML (extensible markup language) for Wireless Images
• SR — Scanning Radiometer
• LVM — Line Verification Module
• A/D — Analog-to-Digital converter
• PSLV — Polar Satellite Launch Vehicle (Indian Space Research Organization; India)
• DDLD — Direct Dial Long Distance
• WTL — Wireless Transport Layer
• CDA — Communications Decency Act of 1996
• ETSI — European Telecommunications Standard Institute
• DNI — Data Network Interface
• CAN — Controller Area Network
• BPP — Billed Party Preference
• OXCO — Oven-Controlled Crystal Oscillator
• NLM — NetWare Loadable Module
• PHY — Physical Layer
• CAMEL — Customized Applications for Mobile-network Enhanced Logic
• MMSI — Maritime Mobile Service Identity
• CAAS — Communications-as-a-Service
• QOI — Quality of Information
• TP — Transaction Processor
• IXC — interexchange carrier
• MDN — Mobile Directory Number
• DAF — Directory Access Function
• PM — Processable Mode
• SIGTRAN — Signaling Transport
• MB — Measured Business
• TMSI — Temporary Mobile Subscriber Identity
• EPP — Enhanced Parallel Port (PC)
• DEM — Digital Elevation Model

• PSQM — Perceptual Speech Quality Measure
• CBQ — Class-Based Queuing
• SIO — Service Information Octet
• SPI — Security Parameters Index
• TRX — Tandem Repeater eXchange
• 3GIP — Third Generation Internet Protocol
• LSP — Label Switched Path
• MSI — Maritime Safety Information
• AECT — Association for Educational Communications and Technology's
• WWAN — wireless wide-area network
• FTS — Federal Telecommunications System
• FFH — Fast Frequency Hopping
• TED — Triteal Enterprise Desktop
• BAOC — Barring of All Outgoing Calls supplementary service
• ANAC — An Automatic Number Announcement Circuit
• GFC — Generic Flow Control (ATM)
• CDV — Compressed Digital Video
• ATB — Above-Ground Telecommunications Backbone
• SR — Slow Release
• ESA — Enhanced Subscriber Authentication
• PMOS — P-channel Metal Oxide Semiconductor
• MBS — Maximum Burst Size (ATM)
• DNC — Do Not Call
• TRLR — Trailer
• MEH — Mobile-Executed Handoff
• DMT — Digital-Discrete Multi-Tone
• AMP — amplifier / amplification
• CGI — Computer Graphics Interface
• ATCA — Advanced Telecom Computing Architecture
• TSR — Terabit Switch/Router
• STM — Scanning Tunneling Microscopy
• NEMP — Nuclear Electromagnetic Pulse
• GTB — Global Telecom Brokers
• AIS-L — Alarm Indication Signal - Line
• W-CDMA — Wideband Code Division Multiple Access
• DLU — Digital Line Unit
• BCIX — Berlin Commercial Internet Exchange
• VCR — Videocassette Recorder
• CLP — Cell Loss Priority (ATM)
• DCEF — Distributed Cisco Express Forwarding
• ILETS — International Law Enforcement Telecommunications Seminar
• * — Star, special function key
• BHCA — Busy Hour Call Attempts
• AIS-V — Alarm Indication Signal - Virtual
• OLS — Optical Line System
• BIC — Bus Interface Controller
• BHCC — Busy Hour Call Completions
• AEA — American Electronics Association's
• # — Number sign, octothorp; special function key
• AAS — Automatic Announcement Subsystem

• QPM — QoS (Quality of Service) Policy Manager
• CDDI — Copper Distributed Data Interface
• OOK — On/Off Keying
• CMT — Commercial Metering Transponder
• BTP — Business Telecom Products, Inc.
• NMS — NetWare Management System
• ISC — International Switching Center
• BSRF — Basic System Reference Frequency
• ROW — Rest Of World
• EVC — Electronic Voucher Charging
• SPT — System Page Table
• DACS — Digital Access and Cross-Connect System
• DUV — Deep Ultraviolet
• EIR — Excess Information Rate
• CEE — Communaut? Economique Europ?enne
• JISC — Japanese Industrial Standards Committee
• WAW — Wide Area Wireless
• SS7 — Signaling System 7
• AAL2 — ATM (Asynchronous Transmission Mode) Adaptation Layer 2
• PSK — Phase Shift Key
• GRX — GPRS Roaming Exchange
• SVI — Service Interception
• MILNET — Military Network
• BDSL — Broadband Digital Subscriber Line
• DCC — Digital Control Channel
• RBS — Robbed Bit Signaling
• CCSA — Common Control Switching Arrangement
• RNR — Receive Not Ready
• LMDS — Local Multipoint Distribution Service
• NRZ — Nonreturn To Zero
• ODS — Operational Data Store (knowledge management)
• AB — Answer Back
• ATRAC — Adaptive Transform Acoustic Coding
• BC — Basic Call
• SDHLR — Super-Distributed Home Location Register
• PSO — Professional Services Organization
• MAC — Message Authenticity Check
• TSGR — Transport System Generic Requirements
• TSI — time-slot interchange
• CCLC — Carrier Common Line Charge
• IOC — Interoffice Channel
• RADARSAT — Radar Satellite
• RM-ODP — Reference Model for Open Distributed Processing
• IPXCP — Internetwork Packet Exchange Control Protocol
• PLCP — Physical Layer Convergence Protocol (ATM)
• DLE — Digital Local Exchange
• SAPI — Service Access Point Identifier
• VOFR — Voice Over Frame Relay
• CCSS6 — Common Channel Signaling System # 6
• MTS — Message Transmission Subsystem

• PSN — Public Switched Network
• DUV — Data-Under-Voice
• DFE — Design For Environment
• LIU — Line Interface Unit
• CSDU — Core Service Data Unit
• FPLMTS — Future Public Land Mobile Telecommunications System
• DNU — Do Not Use
• CVT — Circuit Validation Test
• MAU — Multistation Access Unit
• AFRINIC — African Network Information Centre
• FRF-LMI — Frame Relay Forum - Local Management Interface
• PMMA — Polymethyl Methacrylate
• FAW — Frame Alignment Word
• MEECN — Minimum Essential Emergency Communication Network
• ANT — ADSL Network Terminator
• NTSC — National Television Standards Committee
• OIM — Operations Interface Module
• ACEK — Authentication Encryption Key
• REA — Rural Electrification Administration (US)
• BSVCI — Broadcast Signaling Virtual Channel Identifier
• LEED — Low-energy Electron Diffraction
• PMT — Photo Multiplier Tube
• CACM — Communications of the ACM
• ISD — International Subscriber Dialling
• OCI — object code insertion
• MEID — Mobile Equipment Identifier
• ULP — Upper Layer Protocol
• CLASS — Cell Level ATM (Asynchronous Transfer Mode) Services Simulator
• ATU-R — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Remote terminal end
• CCITT — Comite Consultatif International Telegraphique et Telephonique (now ITU-T)
• UMTS — Universal Mobile Telecommunication System
• VLR — Visitor Location Register
• NICT — National Institute of Information and Communications Technology
• CS — Connection Segment
• ECC — Emergency Communications Center
• VGF — Voice Grade Facility
• ARPT — Autorité de Régulation des Postes et Télécommunications
• CASE — Computer-Aided Software Engineering
• SEM — Scanning Electron Microscopes
• E2E — End-to-End
• UDT — Unreliable Data Transfer
• DLT — Digital Line Termination
• BSC — Base Station Controller
• DCO — Dial Central Office
• VADB — Virtual Auto Dial Backup
• ZD — Zero Defects
• TC — Technical Committee (HL7)
• CU — Cooling Unit
• NAP — Network Access Point
• ADIF — Accounting Data Interchange Format

• ANSI — Advanced Network Signaling Input
• DLT — Delete
• AEIMP — Apple Event Interprocess Messaging Protocol
• WBMP — Wireless Bitmap
• MBE — Molecular Beam Epitaxy
• SMU — Service Management Unit
• IBS — In-Building Solutions
• HUMAN — High-speed Unlicensed Metropolitan Area Network
• FD — Full Duplex
• BTS — Base Transceiver Station (cellular)
• WAR — Wireless Access Revolution
• LAPB — Link Access Protocol-Balanced
• SLIC — Subscriber Loop Interface Circuit
• RCT — remote Control Terminal
• MOS — Metal Oxide Semiconductor (FET Devices)
• BAN — Billing Account Number
• ISSI — Inter-Switching System Interface
• SRS — Supported Residential Services
• BB — Blackberry
• CPN — Customer Premise Network
• UMTS — Universal Mobile Telecommunications Standard
• WFT — Wireline Formation Test
• RDI-L — Remote Defect Indicator - Loop
• ARD — Automatic Ring Down
• BABT — British Approvals Board for Telecommunications
• DSU — Digital Service Unit
• UIH — Unnumbered Information with Header check
• TARP — Target Identifier Address Resolution Protocol
• BHP — Burst Header Packet
• LOP-P — Loss Of Pointer - Path
• CCR — Current Cell Rate (ATMF)
• USRT — Universal Synchronous Receiver/Transmitter
• RDSS — Radio Determination Satellite Service
• JDC — Japan Digital Cellular
• NARC — Non-Automatic Relay Center
• LSMS — Local Service Management System
• 3GSM — Third-generation Global System for Mobile (communications)
• FEBE — Far End Block Error (SONET)
• ATSC — Advanced Television Systems Committee
• LSI — Large-Scale Integration
• EST — Electroshock Therapy
• CD — Committee Draft
• ZBTSI — Zero Byte Time Slot Interchange
• ECDIS — Electronic Chart Display Information System
• SDN — Software Defined Network
• STA — Science and Technology Agency (Japan)
• V — Vector
• TTC — Telemetry Telecommand and Control
• GOSIP — Government Open Systems Interconnection Profile
• SAM — Service Access Multiplexer

• KEK — Key Encrypting Key
• ITA — Illinois Telecommunications Association
• BORSCHT — Battery feed, Overvoltage protection, Ringing, Signaling, Coding, Hybrid, and Testing
• EC — Entropy Coding
• HDB3 — High-Density Bipolar Three-bit substitution
• VPC — Virtual Path Connection (ATM)
• CCC — CDMA Cluster Controller
• LQC — Line Quality Control
• CQ — Communications Quality
• TSD — Type Specific Driver
• DTR — Down-Time Ratio
• SES — Scientific and Engineering Software
• ATIS — Automatic Transmitter Identification System
• KTS — Key Telephone System
• MCPC — Multiple Channels Per Carrier
• ACU — Automatic Calling Unit
• BRAN — Broadband Radio Access Network
• USF — Universal Server Farm
• ASAS — All-Source Analysis System
• WSP — Wireless Service Provider
• WCMP — Wireless Control Message Protocol
• WPBX — Wireless Private Branch Exchange
• CSP — Continuous Speech Processing
• ADM 3X — DS3 Add-Drop Multiplex
• LEC — Liquid Encapsulated Czochralski
• AIU — Analog Interface Unit
• ECTF — Enterprise Computer Telephony Forum
• RLS — Recursive Least Squares
• LRB — Loop Reverse Battery
• DMI — Desktop Management Interface (computing)
• USPI — Universal Serial Phone Interface
• SCORM — Shareable Content Object Reference Model
• ALT — Automatic Link Transfer
• WPKI — Wireless Public Key Infrastructure
• ISP — International Signaling Point
• AA — Auto-Answer
• FLL — Fixed-Loss Loop
• SNI — Service Node Interface
• RADSL — Rate Adaptive Digital Subscriber Line
• INAP — Intelligent Network Application Part
• BCSM — Basic Call State Model
• BHA — Busy Hour Attempts
• DOITT — Department of Information Technology and Telecommunications
• CTTC — Centre Tecnològic de Telecomunicacions de Catalunya
• CLF — Carrier Line Failure
• LMT — Lightwave Microcell Transceiver
• LRF — Laser Range Finder
• DACS — Digital Access Carrier System
• PFE — Power Feed Equipment
• E — Exchange

• DORA — EV-DO (EVolution-Data Optimized) standard Revision A
• AFI — Authority and Format Identifier
• MDCP — Media Device Control Protocol
• CAS — Column Address Strobe
• CSI — Clearing Subnetwork Identification
• BUS — Broadcast and Unknown Server
• ETOC — Electronic Table of Contents
• ATMS — automatic transmission measuring system
• AIS-P — Alarm Indication Signal - Path
• TSC — Technical Standards Committee
• QEDI — Quod Erat Demonstrandum
• NAM — Number Assignment Module
• OC-1 — Optical Carrier Signal, Level 1
• BFS — Broadcast File System
• SR — Service Request
• LMS — Local Measured Service
• C² — Command and Control
• GOMP — Get Off My Phone
• SNIX — Single Noise Interference Xterminator
• DF — Direction Finding or Finder
• CCH — Common Channel Handler
• OID — Object Interaction Diagram
• DSP — Data Service Provider
• AVT — Audio Visual Telecommunications
• LDI — Long Distance Interconnect
• EC — Echo Cancelling
• LAT — Local Area Transport (network)
• TWX — Teletypewriter Exchange (Telex)
• APS — Advanced Power System
• CALS — Computer Aided Acquisition and Logistic Support
• NESC — National Electrical Safety Code
• CLI — Calling Line Identification
• CALA — Customer Address Location Area
• AGCH — Access Grant Channel
• DLC — Digital Leased Circuit
• QOD — Quality of Data
• APR — Alarm Processing Remote
• IR — Information Request
• WUP — Wired Up Privacy
• MMS — Multimedia Message Service
• LFTYR — Ley Federal de Telecomunicaciones y Radiodifusión
• ADTS — Ameritech Digital Transport Service
• VCC — Voice Call Continuity
• RLC — Radio Link Control
• IMTS — Improved Mobile Telephone Service
• LUNT — Line Unit Network Termination
• PNE — Path Number Efficiency
• FEBE-F — Far End Block Error count - Fast data
• NSEP — National Security Emergency Preparedness
• KSPS — KiloSymbols Per Second

• WAWS — Washington Area Wideband System
• BCS — British Computer Society
• AEE — Agent Execution Environment
• DCA — Distributed Communications Architecture
• JSC — Joint Scientific Committee (ICSU, WCRP, and WMO)
• JMA — Japanese Meteorological Agency
• GOSIP — Government Open System Interconnection Profile
• RAI — remote alarm indication
• ETSI — European Telecommunications Standards Institute
• SMT — station management (protocol)
• DS-1 — Digital Signal, Level 1
• DOV — Data-Over-Voice
• EADAS — Engineering and Administrative Data Acquisition System
• GSM — Global System for Mobile telecommunications
• CEPT — Conference of European Posts and Telecommunications
• ATTRA — Appropriate Technology Transfer for Rural Areas
• SDCCH — Standalone Dedicated Control Channel
• RCMAC — Recent Change Memory Administration Center
• DPT — Dial Pulse Terminate
• MQFP — Metric Quad Flat Pack
• FECC-F — Forward Error Correction Count - Fast data
• FOTS — Fiber Optical Transmission System
• RS-422 — Recommended Standard 422 (ANSI/EIA standard for transmitting serial data)
• ACNA — Access Customer Name Abbreviation
• DAS — Distributed Antenna System
• WDSL — Wireless Digital Subscriber Line
• TOMS — Telecom Operations Management System
• ML-PPP — Multilink Point-to-Point Protocol
• ACA — Automatic Circuit Assurance
• DCB — Digital Channel Bank (Sprint)
• MBMS — Multimedia Broadcast/Multicast Service
• GOS — Gerry Otis Simpson
• ADTS — Automated Digital Terminal System
• WAPI — Wireless LAN Authentication and Privacy Infrastructure
• DDS — Dataphone Digital Service (AT&T)
• DTU — Date/Time Update
• APS — American Protective Services
• CYTA — Cyprus Telecommunications Authority
• STD — Secondary Telecom District
• PTO — U.S. Patent And Trademark Office
• NMC — Network Model Coverage
• F/W — Firmware
• GTXC — Global Telephone Exchange Carrier
• IOS — Internet Over Satellite
• MED — Manipulative Electronic Deception
• MRVT — MTP Routing Verification Test
• DCSS — Digital Cross-connect Systems
• ESP — Essential Service Protection
• IPOATM — Internet Protocol over ATM
• TACS — Total Access Cellular System

• HTO — Hellenic Telecommunications Organisation
• AS — Active Service
• PTT — Post Telegraph and Telecommunications
• SMG — Super Master Group
• HQGSM — High-Quality Global System for Mobile communications
• LCU — Lightweight Computer Unit
• CONS — Connection-oriented Network Services
• EMV — EuroPay, MasterCard, Visa
• MEAS — Measure
• WDF — Wireless Data Forum
• MAPDU — Management Application Protocol Data Unit
• RSN — Regional Service Network
• CAIRO — Communications Audio Interface for Remote Operations
• ICTA — Idaho Cable Telecommunications Association
• TCL — Transverse Conversion Loss
• MP — Master Processor
• FWS — Fixed Wireless Services
• EC — Equipment Controller
• VGC — Voice Grade Channel
• PRM — Performance Report Message
• RCF — Remote Call Forwarding
• MVDS — Microwave Video Distribution System
• AQP — Association for Quality and Participation
• DTW — Dynamic Time Warping
• SASL — Simple Authentication and Security Layer
• CT — Control terminal
• AL — Alignment
• ATR — Advanced Telecommunications Research Institute
• UTP — unshielded twisted pair
• CMOS — Cellular Management Operation System
• EDGE — Enhanced Data for GSM (Global System for Mobile communication) Evolution
• VAD — Voice Activity Detection
• PCIA — Personal Communications Industry Association
• LOB — Line Of Bearing/Balance
• SGS — Software Generation System
• WDMW — Web Directory for Mobile and Wireless
• PSC — Picture Start Code
• UPS — Un-interruptable Power Supply
• INWATS — INward Wide Area Telecommunications Service
• WGX — Wireless Gateway Switch
• SCO — Synchronous Connection Oriented
• NSE — Network Software Environment
• MERIS — medium-resolution imaging spectrometer
• CSAA — Central Service Area Authority
• E-TDMA — Expanded Time Division Multiple Access
• ASP — Active Signaling Protocol
• UTP — Universal Transmission Protocol
• DECT — Digital Enhance Cordless Telecommunications
• AUSPI — Association of Unified Telecom Service Providers of India
• ICLD — Inter-Channel Level Difference

• TPF — Transmission Priority Field
• PTM — Point-To-Multipoint
• CFR-47 — Code of Federal Regulations Title 47 (FCC)
• ZCZ — Zero Correlation Zone
• TAE — Terminal Adapter Equipment
• CIPOA — Classical Internet Protocol over ATM (Asynchronous Transfer Mode)
• M/W — MicroWave
• BSSMAP — Base Station System Management Application Part
• PAGCH — Paging and Access Grant Channel
• CPS — Customer Premises System (Bellcore)
• CAE — Common Application Environment
• FOE — Fiber Optic Equipment
• LSF — Line Spread Function
• DORK — Disciples Of The Righteous King
• IMPI — IP (Internet Protocol) Multimedia Private Identity
• PT — Payload Type (ATM)
• WIS — WAN (Wide Area Network) Interface Sublayer
• SDSL — Symmetrical Digital Subscriber Line
• DRTT — Dial Repeating Tie Trunk
• SACS — Security Access Control System
• MOC — Maintenance and Operations Console
• ACMA — Atlantic Cable Maintenance Agreement
• LTU — Line Termination Unit
• CL — cell loss
• MIN — Mobile Identification Number
• CLOS — Clear Line Of Sight
• CF — Coin First Payphone
• NAM — Numeric Assignment Module
• TD-CDMA — Time Division - Code Division Multiple Access
• DMNG — Digital Mobile News Gathering
• CW — Call Waiting Supplementary Service
• ICI — Interexchange Carrier Interface
• IPC — Initial Paging Channel
• CMAS — Cellular Management System
• BIOS — Basic Input-Output System
• IPCU — iPhone Configuration Utility
• NSDI — National Spatial Data Infrastructure
• MNOS — Metal-nitride-oxide Semiconductor
• IPTD — Internet Protocol Telephony Design
• DACS — Digital Access Cross-Connect Switch
• CFNA — Call Forwarding No Answer
• 4G — Fourth Generation
• NICAD — Nickel Cadmium
• RSL — Request and Status Links
• SLIP — Serial Line Internet Protocol
• SMDR — station message detail recording
• BPOP — Building Point of Presence
• PTM — Packet Transport Mode
• EC-N — Electrical Carrier (n=a number, e.g., EC-4)
• DCS — Digital Cross-connect Switch

• OODBMS — Object-Oriented Database Management Systems
• LQR — Line Quality Report
• TPC — The Phone Company
• BANC — Broadband Access Network Coordination
• MO — Magneto-optic
• COI — Community of Interest
• NMC — Nortel Matra Cellular
• DPDCH — Dedicated Physical Data Channel
• RBT — Ring Back Tone
• BTO — Betts Telecom Oklahoma
• CTIT — College of Telecommunications and Information Technology
• M2M — Multipoint-to-Multipoint
• WLNP — Wireless Local Number Portability
• CD-ROM — Compact Disk-Read-Only Memory
• NAU — Network Addressable Unit
• SAMA — Spread Aloha Multiple Access
• ESG — Enhanced Service Gateway
• SLC — Service Level Contract
• WPOP — Wireless Point-of-Presence
• D4 — Digital channel bank, Fourth generation
• FEBE-I — Far End Block Error count - Interleaved data
• NSN — National Significant Number
• SM OFC — Single-Mode Optical Fiber Cable
• RSI — Record Status Indicator
• LRF — Location Registration Function
• IRAC — Interdepartment Radio Advisory Committee
• DF — Distributing Frame
• CDR — Common Data Rate
• CAL — Customer Access Line
• EF&I — Engineering, Furnishing and Installation
• RU — Release Unit
• EKTS — Electronic Key Telephone Set
• SINS — Ship’s Inertial Navigation System
• SSTC — Subsystem Status Test Control
• TR — Temporal Reference
• VCT — Variable Cam Timing
• DCMES — Dublin Core Metadata Element Set
• CSTA — Computer Supported Telecommunications Applications
• RCR — Research and Development Center for Radio Systems
• CLIP — Caller Line Identification Presentation
• SGCP — Simple Gateway Control Protocol
• VC — Virtual Circuit (ATM)
• FELB — Far-End Loop Back
• DFRI — Datacom Reference Frame Input
• TON — IEEE/ACM Transactions On Networking
• RYP — Russian Yellow Pages
• UVG — Universal Voice Grade
• VHM — Voice Health Monitor
• MMC — Minimum Monthly Charge
• IPR — Intellectual Property Right

• DEO — Digital End Office
• DBN — Dial-Back Number
• WDRM — Wireless Design Reference Manual
• ARCNET — Attached Resource Computer Network
• SMAS — Service Management System
• WEDE — Wireless Enterprise Delivery Environment
• ASC — Available Spare Capacity
• DE — Discard Eligible
• ARAI — Adjunct Route Application Interface
• DDSD — Delay Dial Start Dial
• CM — Common Mode
• AH — Authentication Header
• SHR — Self-Healing Ring
• TBRL — Terminal Balance Return Loss
• RZ — Return to Zero
• VGCP — Voice Grade Channel Processor
• TACSIM — Tactical Simulation (Simulator)
• MRCA — Most Recent Common Ancestor
• ADC — Advanced Data Control
• UTRAN — UMTS (Universal Mobile Telecommunication System) Terrestrial Radio Access Network
• IS 41 — Interim Standard 41 (Inter-Cellular Network Communication Protocol)
• HU — Hook Up
• DRTL — Dial Repeating Tie Line
• BONDING — Bandwidth On Demand Interoperability Group
• TFL — Telecom Fiji Limited
• ADM — Administration, Office of
• JWG — Joint Working Groupof
• DLCS — Digital Loop Carrier System
• STDM — Statistical Time Division Multiplexing
• VRT — Voltage Reduction Technology
• NECA — National Exchange Carrier Association
• LBX — Low Bandwidth X
• ROSE — Remote Operations Service Element
• TRAC — Totally Reconfigurable Analog Circuit
• GEO — Geostationary Earth Orbit
• RDI-P — Remote Defect Indicator - Path
• FUD — Fair Use Doctrine
• AGPS — Assisted Global Positioning System
• 4WE&M — Four-Wire Ear and Mouth
• CUG — Closed Users Group
• WAGN — West Antarctic GPS (Global Positioning System) Network
• CD ROM — Compact Disc Read-Only Memory
• DISA — Direct Inward Switch Access
• SYNC — Synchronization
• NARSAP — National Advanced Remote Sensing Application Program
• LADS — Local Area Data Service
• CITR — Canadian Institute for Telecommunications Research
• TP-PMD — Twisted Pair Physical Medium Dependent
• FRAD — Frame Relay Assembler/Disassembler
• WCRL — Wireless Communications Research Laboratory

• NIMH — Nickel-Metal Hydride
• VDSL — VHBR (Very High Bit Rate) Digital Subscriber Line
• WTP — Wireless Transaction Protocol
• JWP — Joint Working Party
• SC — Switching Center
• GPBX — Global Private Branch eXchange
• OST — Office of Science and Technology
• UPC — Usage Parameter Control
• HEC — Header Error Control
• STE — Syrian Telecommunications Establishment
• ASA — Avaya Site Administration
• FEFA — Far End Failure
• SSCP — System Services Control Point
• RLC — Reverse Link Channel
• WNAS — Wireless Network Access Services
• CNE — Certified Novell Engineer
• AFIPS — American Federation of Information Processing Societies
• EDT — European Deaf Telephone
• VAB — Vehicle Assembly Building
• MM — Multimode (fiber optic cable)
• D/I — Drop and Insert
• CVSD — Continuous Variable Slope Detection
• NSM — Network Status Monitor
• RFI — Remote File Inquiry
• DTS — Digital Terminal Systems
• MRT — Medical Response Team
• WIG — Wireless Internet Gateway
• DUNCE — Dial-Up Networking Connection Enhancement
• NPSI — Network Packet Switching Interface
• SCC — Signal Conversion Circuit
• MOD — Modulo
• BTN — Billing Telephone Number
• DM — Design Manager
• QPA — Quality Performance Analysis
• WVPN — Wireless Virtual Private Network
• GRUB — Greedy Reclamation of Unused Bandwidth
• DBF — Digital Beam-Forming
• EGPRS — Enhanced General Packet Radio Service
• TCAM — Telecommunications Access Method
• PMD — Physical Media-Dependent
• CARS — Community Antenna Relay Service
• SYSADM — System Administrator
• TEM — Transmission Electron Microscope
• ILETS — Idaho Law Enforcement Telecommunication System
• SM — Statistical Multiplexing
• ESM — electronic support measure
• ETOM — Enhanced Telecom Operations Map
• UBT — Universal Backend Tester
• OC-96 — Optical Carrier Signal, Level 96
• TANE — Telephone Association of New England

• ISM — Interstellar Medium
• EFRC — Enhanced Full Rate Codec
• GTM — Go to Meeting
• CDPD — Cellular Digital Packet Data
• RTFM — Read The Friendly Manual
• STD — Standard Deviation
• IRLAP — InfraRed Link Access Protocol
• 2G — Second-generation mobile telephone system
• STN — Station Casinos, Inc.
• APTC — Atlantic Provinces Telecommunications Council
• ENUM — tElephone NUmber Mapping
• EEHO — Either End Hop Off
• IDSL — ISDN (Integrated Services Digital Network) Digital Subscriber Line
• UDC — Universal Digital Channel