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Computing & IT >> Telecom Abbreviations

Look through 4999 acronyms and abbreviations related to Telecom:

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

• UAX 14 — Unit Automatic eXchange type 14
• D-H — Diffie-Hellman
• CPU — Central Processing Unit
• LED — Light-Emitting Diode
• UK — United Kingdom of Great Britain and Northern Ireland
• IRC — Internet Relay Chat
• BBS — Bulletin Board Service
• ISO — In Search Of
• ADM — Add-Drop Multiplexer
• ZDBOP — Ziff-Davis Benchmark Operation
• WACN ID — Wide Area Communications Network IDentifier
• VIP — Very Important Person
• BPM — Beats Per Minute
• OEM — Original Equipment Manufacturer (usually in reference to car parts)
• CPE — Customer Premises Equipment
• C-NBAP — Common Node B Application Part
• BTW — By The Way
• DWDM — Dense Wavelength-Division Multiplexing
• DND — Do Not Disturb
• 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.
• SABGW — System Architecture Evolution Gateway
• B-ICI — Broadband Inter-Carrier Interface
• A-KEY — Authentication key
• AUP — Acceptable Use Policy
• M-CSI — Mobility management CAMEL (Customized Applications for Mobile network Enhanced Logic) Subscription Information
• T-IC — T-interConnect
• F2F — Face To Face (also Meeting In Person)
• OC-18 — Optical Carrier Signal, Level 18
• RF — Radio Frequency
• RFQ — Request For Quotation
• VC-ATOD — Virtual Clearinghouse on Alcohol, Tobacco and Other Drugs
• H323 — ANSI standard for format over IP
• OC-9 — Optical Carrier Signal, Level 9
• C4I — Command, Control, Communications, Computers, & Intelligence
• I.LINK — IEEE 1394, High Performance Serial Bus, implementation
• TEMIP — Telecommunications Management Information Platform
• E-LEAD — Ear Lead
• ATM — Automatic Teller Machine
• DSC — Differential Scanning Calorimetry
• IP — Internet Protocol
• QC — Quality Control
• T-CARRIER — Trunk Carrier
• KBYTE — Kilobyte (103)
• CDR — Critical Design Review
• OC-256 — Optical Carrier Signal, Level 256
• FEMA — Federal Emergency Management Agency
• D-NBAP — Dedicated Node B Application Part
• PDR — Preliminary Design Review
• ISO — International Organization for Standardization
• LCD — Liquid Crystal Display

• DAHDI — Digium/Asterisk Hardware Device Interface
• EDI — Electronic Data Interchange
• VAZO — Violating All-Zero Octet
• COB — close of business (End of duty day)
• WWW — World Wide Web
• EAP — Employee Assistance Program
• DBORS — Data Base of Records
• PPM — parts per million
• GSM — Global System for Mobile Communications
• POC — Point Of Contact
• AFAIK — As Far As I Know
• FET — Field Effect Transistor
• CCB — Change Control Board
• AC — Alternating Current
• ECU — Electronic Control Unit
• CSA — Canadian Space Agency
• WTG — Way To Go
• C³CM — Command, Control and Communications Countermeasures
• IRR — Internal Rate of Return
• DAC — Discretionary Access Control
• FIFO — First In, First Out
• LLC — Limited Liability Company
• ACH — Automated Clearing House
• BVR — Beyond Visual Range
• VAT — Value Added Tax
• ABI — Application Binary Interface
• SAR — Search And Rescue
• ISP — Internet Service Provider
• LRU — Line Replaceable Unit
• CY — Calendar Year
• TNYWR — The Number You Will Receive
• CUG — Closed User Group
• UDP — User Datagram Protocol (FDDI related)
• TQM — Total Quality Management
• IRL — In Real Life
• ATTN — Attention
• PDA — Personal Digital Assistant
• CEO — Chief Executive Officer
• WML — Wireless Markup Language
• ESA — European Space Agency
• NMSE — Normalized Mean Square Error
• QFSK — Quadrature Frequency Shift Keying
• RFP — Request For Proposal
• BTU — British Thermal Unit
• AMD — Advanced Micro Devices, Inc. (producer of computer chips)
• RPI — Retail Price Index
• ASA — American Standards Association
• PDF — Portable Document Format (created by Adobe Acrobat)
• SMTP — Simple Mail Transfer Protocol
• URL — Universal Resource Locator

• EDS — Electronic Data Systems Corporation
• DOA — dead on arrival
• ACE — Access Control Entry
• DFD — Displaced Frame Difference
• CV — Curriculum Vitae
• R&D — Research & Development
• ASTM — American Society for Testing and Materials (Philadelphia, Pennsylvania)
• PSK — phase-shift keying
• EIS — Executive Information System
• API — Application Programming Interface
• MOU — Memorandum of Understanding (an MOU between Food & Drug Administratin and a regulatory agency in another country allows mutual recognition of inspections)
• ACC — Adaptive Cruise Control
• DSCP — Differentiated Services Control Point
• GIS — Geographic Information System
• ADSL — Asymmetric Digital Subscriber Line
• MBR — Master Boot Record
• IPO — Initial Public Offering
• WBS — Work Breakdown Structure
• CD — Compact Disc
• GATT — General Agreement on Tariffs and Trade (government)
• PDT — Pacific Daylight Time
• DBMS — Database Management System
• ACK — ACKnowledgment
• CCSDS — Consultative/Consultative Committee for Space Data Systems
• ASME — American Society of Mechanical Engineers
• NFS — Network File System
• THX — Thanks
• ABC — activity based costing
• WWW3 — World Wide Web Consortium
• COR — Carrier Operated Relay
• RDY — Ready
• MRI — Magnetic Resonance Imaging
• CCM — counter-countermeasure
• NYSE — New York Stock Exchange
• ATA — Area Transportation Authority
• SRAM — Static Random Access Memory (ess-ram)
• BIP — Bit-Interleaved Parity
• AIR — Account Information and Refill
• ATM — Asynchronous Transfer Mode
• HTTP — Hypertext Transfer Protocol
• AIS — Automated Information System
• EST — Eastern Standard Time
• NOS — Network Operating System
• MTBF — Mean Time Before Failure
• AATSR — Advanced Along-Track Scanning Radiometer
• ASCII — American National Standard Code for Information Interchange
• BRB — Be right back
• WEP — Wired Equivalent Privacy
• PCB — printed circuit board
• VM — Voice Mail

• LRJ — Location Reject
• EPA — Environmental Protection Agency (US)
• GPS — Global Positioning System (ex-NAVSTAR)
• SAN — Storage Area Network
• SLA — Service Level Agreement
• MST — Mountain Standard Time
• SDMA — Space Division Multiple Access
• CCTV — Closed-circuit television
• AM — Ante Meridian
• WDM — Wavelength Division Multiplexing (fiber optics)
• MB — Megabyte
• BUR — Bandwidth Usage Redundancy
• AES — Advanced Encryption Standard
• GUI — Graphical User Interface (goo-ey)
• JV — Joint Venture
• EU — European Union (1994; formerly referred to as the EEC or EC)
• EOM — End Of Message
• CR — Carriage Return
• CS — Computer Science
• CIO — Chief Information Officer
• PDH — Plesiochronous Digital Hierarchy
• CAE — Computer-Aided Engineering
• RFC — Request For Comment
• FM — frequency modulation
• FAA — Federal Aviation Administration
• RWR — Radar Warning Receiver
• ICT — Information and Communication Technology
• CGI — Common Gateway Interface
• RAM — random-access memory
• NIC — Network Interface Card
• ALC — Automatic Level Control
• PUHU — Pick Up Hang Up
• MMS — Multimedia Messaging Service
• TTYL — Talk To You Later (Internet Slang)
• FAR — Federal Aviation Regulation
• CPT — Carriage Paid To
• ARPA — Advanced Research Projects Agency (made early internet)
• RDBMS — Relational Database Management System
• DDD — Direct Distance Dial
• APT — Automatic Picture Transmission
• FX — Foreign Exchange
• ATCRBS — Air Traffic Control Radar Beacon System
• NPV — Net Present Value {economics}
• EC — European Commission
• WAN — Wide Area Network
• BSD — Berkeley Software Distribution
• Y2K — Year 2000
• ACO — Additional Call Offering
• STS — Space Transportation System
• CRT — Cathode Ray Tube (type of TV)

• DB — Decibel
• AAC — Advanced Audio Coding
• AM — Amplitude Modulation
• SWAG — Scientific Wild Ass Guess
• IETF — Internet Engineering Task Force
• WWW — World Weather Watch
• GPRS — General Packet Radio Service
• SCC — Standards Council of Canada
• ADD — Addendum
• SD — Standard Deviation
• DSA — Digital Signature Algorithm
• CPM — Critical Path Method
• 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.
• SDR — Special Drawing Rights
• CAUCE — Coalition Against Unsolicited Commercial Email
• DES — Data Encryption Standard
• QMS — Quality Management System
• CIS — Commonwealth of Independent States
• DDL — Data Definition Language
• UAV — Unmanned Aerial Vehicle
• ACD — Automatic Call Distributor
• PO — Purchase Order
• NATO — North Atlantic Treaty Organisation
• SME — Subject Matter Expert
• ADR — Address
• ACK — Acknowledge (telecommunications; Cf. NAK)
• SCSI — Small Computer System Interface
• DMSP — Defense Meteorological Satellite Program (U.S.)
• PDN — Public Data Network
• RNC — Radio Network Controller
• EFF — Electronic Frontier Foundation
• VHF — Very High Frequency
• AOA — Angle Of Arrival
• CIR — Committed Information Rate (Frame Relay)
• NIH — Not Invented Here
• FAQ — Frequently Asked Questions (sometimes Pronounced Fak)
• HSD — High Speed Data
• ADM — Add/Drop Multiplexer
• MOB — Mobile
• AES — Auger Electron Spectroscopy
• QOS — Quality of Service
• PVT — Private
• P&L — Profit and Loss statement
• RPM — Revolutions Per Minute, (Rotations Per Minute)
• DME — Distance Measuring Equipment
• PGP — Pretty Good Privacy (encryption)
• DOD — United States Department of Defense
• SLIP — Serial Line Interface Protocol
• SAS — Statistical Analysis System
• MIS — Management Information System (OSHA)

• SQA — Software Quality Assurance
• MSN — Microsoft Network
• TBD — To Be Determined
• DHCP — Dynamic Host Configuration Protocol
• EW — Electronic Warfare
• NPI — New Product Introduction
• ABR — Available Bit Rate
• ACL — Access Control List
• COO — Chief Operation Officer
• JAXA — Japan Aerospace Exploration Agency
• 100BASE-T2 — 100 Megabits per Second, Baseband, Two-pair Category 3 UTP cables
• ACM — Association for Computing Machinery
• ACE — Advanced Computing Environment
• AD — Active Directory
• AME — Amplitude Modulation Equivalent
• IVR — Interactive Voice Response (telephone technology)
• PNG — Portable Network Graphics (graphic file standard/extension)
• RFI — Request For Information. Sales department shorthand. Special priority when use in conjunction with RFN (see below).
• UPS — Ultraviolet Photoelectron Spectroscopy
• EEC — European Economic Community (predecessor of the European Union|EU)
• DNS — Domain Name System
• VR — Virtual Reality
• ASR — Airport Surveillance Radar
• RM — Resource Management
• CAD — Computer Aided Designer
• AC — Access Control
• TCB — Trusted Computing Base
• EBCDIC — Extended Binary Coded Decimal Interchange Code (pronounced Eb-see-dik) (cf. BCD)
• QA — Center for Quality Assurance in International Education
• DSS — Decision Support System
• CCIS — Common Channel Interoffice Signaling
• VPN — Virtual Private Network (ATM)
• RACON — Radar Beacon
• VVX — Voice and Video eXchange
• AVHRR — Advanced Very High Resolution Radiometer  
• TCP — Transmission Control Protocol
• CBT — Computer Based Training
• SLF — Super Low Frequency
• PM — Preventive Maintenance
• USB — Universal Serial Bus
• JIT — Just in time
• DRAM — Dynamic Random Access Memory (dee-ram) (computing)
• ABET — Accreditation Board for Engineering and Technology, Inc.
• OCR — Optical Character Recognition
• DARPA — Defense Advanced Research Projects Agency (US)
• DC — Direct Current
• BCC — Blind Carbon Copy
• CB — Call Back
• DTE — Data Terminal Equipment
• OMG — Object Management Group

• FIPS — Federal Information Processing Standard
• ASK — amplitude shift keying
• QI — Quality Improvement
• CU — Control Unit
• AE — Account Executive
• RU — Are You?
• DTX — Discontinuous Transmission
• WB — Welcome Back
• FFT — Fast Fourier Transform
• CMI — Computer Managed Instruction
• LEO — Low Earth Orbit (satellite communications)
• EVP — Executive Vice President
• O&M — Operation and Maintenance
• RPC — Remote Procedure Call
• B3ZS — bipolar 3-zero substitution
• BECN — Backward Explicit Congestion Notification
• SMS — Short Message Service
• TNSTAAFL — There's No Such Thing As A Free Lunch
• GSA — U.S. General Services Administration
• ROI — Return on Investment
• ISDN — Integrated Services Digital Network
• DOJ — Department of Justice (US)
• MTTR — Mean Time To Repair
• ATC — Air traffic control
• DFS — Distributed File System
• AOL — America on line
• EMG — Electromyogram
• CC — Carbon Copy
• AAAI — American Association for Artificial Intelligence's
• ISRO — Indian Space Research Organisation
• I/O — Input/Output
• NEC — National Electrical Code
• OBO — Or Best Offer
• CRM — Customer Relationship Management
• SEI — Software Engineering Institute
• TC — Telephone Call
• POP — Point Of Presence (Internet)
• ENIAC — Electronic Numerical Integrator And Computer
• ECO — Engineering Change Order
• SOW — Statement Of Work
• APIC — Advanced Programmable Interrupt Controller
• UHF — Ultra High Frequency (300-3000 MHz; 1m-10cm)
• ATF — Advanced Tactical Fighter
• DMTS — Distinguished Member Of Technical Staff
• CRL — Certificate Revocation List
• WLTF — Wireless LAN (Local Area Network) Task Force
• CAM — computer aided manufacturing
• MDA — Monochrome Display Adapter
• IM — Instant Message
• CU — See You

• CBC — cipher block chaining
• CDR — Call-Detail Record
• SDD — Software Design Document
• SXS — Step-By-Step
• AGC — Automatic Gain Control
• SP — Service Provider
• AF — Audio Frequency
• CLI — Command line Interface (Cabletron)
• WAFB — Wireless Absolute Fairness Bound
• ADPE — Automatic Data Processing Equipment
• GRE — Generic Routing Encapsulation
• BR — Branch
• NSF — National Sanitation Foundation
• VTC — Video Teleconference
• ERP — Enterprise Resource Management
• CM — Configuration Management
• ATS — applications technology satellite
• PAR — Precision Approach Radar
• CFE — Contractor-Furnished Equipment
• IRS — U.S. Internal Revenue Service
• DSL — Digital Subscriber Line
• SGML — Standard Generalized Markup Language
• TCO — Total Cost of Ownership
• RAID — Redundant Array of Inexpensive Disks
• AGP — Accelerated Graphics Port
• SIG — Special Interest Group
• PE — Polyethylene
• TAC — Technical Assistance Center
• ZIP — Zone Improvement Plan
• AP — Application Protocol
• VIRUS — Vital Information Resources Under Siege
• BST — British Summer Time
• NMT — Nordic Mobile Telephone
• AE — Application Entity
• PC — Personal computer (host)
• PERT — Program Evaluation and Review Technique
• MAC — Message Authentication Code
• M — Meter
• PLD — Programmable Logic Device
• LCP — Link Control Protocol
• ERP — Enterprise Resource Planning
• DLL — Dynamic Link Library (computer file)
• Q&A — Question & Answer
• OSI — Open Systems Interconnection (iso Standard)
• CRC — Contrôle de Redondance Cyclique (French: Cyclic Redundancy Check)
• DDE — Dynamic Data Exchange (in software parlance)
• DMX — De-MultipleXer
• HVAC — Heating, Ventilation, and Air Conditioning
• W3C — World Wide Web Consortium
• RM — Regional Manager

• EAP — Extensible Authentication Protocol
• FDDI — Fiber Distributed Data Interface
• SQL — Structured Query Language
• ATM — Adobe Type Manager
• ERT — Emergency Response Team
• IRLAN — Infrared LAN
• TOS — Type Of Service
• NIST — National Institute of Standards and Technology
• MLS — Multiple Listing Service
• ISO — Infrared Space Observatory
• BBU — Baseband Unit
• CAA — Civil Aviation Authority
• IMPACT — Integrated Manufacturing Precision Assembly Cellular Technology
• ITU — International Telecommunication Union
• PECVD — Plasma-Enhanced Chemical Vapor Deposition
• PMA — Physical Medium Attachment
• ACFQ — Absence Compensation Fair Queuing
• TV — Television
• DIT — Directory Information Tree
• BBS — Bulletin Board System
• PLMN — Public Land Mobile Network
• CDT — Central Daylight Time
• DQE — Detective Quantum Efficiency
• DLR — Design Layout Record
• AAAS — American Association for the Advancement of Science
• RCU — Remote Control Unit
• EGA — Enhanced Graphics Adapter
• SIC — Standard Industrial Classification (Code)
• PT — Project Team
• DSTE — Digital Subscriber Terminal Equipment
• AADC — Automated Area Distribution Center
• PRI — Primary Rate Interface (ISDN)
• CIM — Corporate Information Management
• SAIC — Science Applications International Corporation
• FCA — Free Carrier
• NSA — National Security Agency
• EEG — Electro-EncephaloGram
• BS — Base Station
• MOS — Model Output Statistics
• AQL — Acceptable Quality Level
• CAM — Computer-Aided Mapping
• FCW — Federal Computer Week
• DLC — Digital Loop Carrier
• RFI — Radio Frequency Interference
• BPR — Business Process Re-engineering
• BCD — Binary-Coded Decimal
• LED — law enforcement desk; light emitting diode
• MHS — Message Handling System (electronic)
• MIC — Message Integrity Check
• ARP — Address Resolution Protocol (ATM)

• Z — Zero
• DSA — Directory System Agent
• BPRZ — Bipolar Return-to-Zero
• 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
• BT — British Telecommunications
• QAM — quadrature amplitude modulation
• AFC — Automatic Frequency Control
• CMS — Content Management System
• CW — Continuous Wave
• OSS — Operational Support System
• CIC — Circuit Identification Code
• NMR — Nuclear Magnetic Resonance
• SOHO — Small Office Home Office
• COQ — Cost Of Quality
• CHAP — Challenge Handshake Authentication Protocol (ATM)
• HSDPA — High-Speed Downlink Packet Access
• BER — Bit-Error Rate
• FTTB — Fiber To The Building
• NA — Not Applicable
• CIM — Common Information Model
• CST — Central Standard Time (UTC-6 Hours)
• VDS — Variable Depth Sonar
• ASP — Application Service Provider
• UAS — Unavailable Seconds
• MS — Message Store
• NOAA — National Oceanic and Atmospheric Administration (US)
• CMM — Capability Maturity Model
• HDLC — High-Level Data Link Control
• ADT — Abstract Data Type
• HZ — cycles per second (hertz)
• VAC — Vacant
• RCC — Rescue Coordination Center
• CFO — Communication Filing Officer
• AT — Advanced Technology
• AEC — Architecture, Engineering, Construction
• OS — Operating System
• LLC — Logical Link Control
• ME — Mobile Equipment
• ISS — International Space Station
• MS — Mobile Station
• CIA — Central Intelligence Agency
• RIP — Routing Information Protocol
• TPDU — Transport Protocol Data Unit
• PDU — Protocol data unit (such as segment, packet, frame, etc.)
• OSPF — Open Shortest Path First (ATM)
• FC — Fibre Channel
• ICMP — Internet Control Message Protocol
• PPB — parts per billion (109)
• JIS — Japanese Industrial Standard
• ADF — Automatic Direction Finder

• DCN — Design Change Notification
• DQPSK — Differential Quadrature Phase-Shift Keying
• JPL — Jet Propulsion Laboratory (California Institute of Technology) (NASA)
• NTIA — National Telecommunications and Information Administration
• MF — Medium Frequency
• NAS — Network Access Server
• LP — Low Pressure
• CDS — Cell Directory Service
• EDVAC — Electronic Discrete Variable Automatic Computer
• UR — Your
• LF — Low Frequency
• DOS — Disk Operating System
• WYSIWYG — What You See Is What You Get (pronounced Wizzy-wig. See Entry For Derived Acronyms)
• IS — Intermediate System
• DCE — Distributed Computing Environment
• AMI — Advanced Metering Infrastructure
• NEMA — National Electric Manufacturer's Association
• JSC — Johnson Space Center (Houston, TX)
• CUL — See You Later
• SPC — Stored Program Control
• SBC — Southwestern Bell Corporation
• URI — Uniform Resource Identifier
• PWD — Password
• PAL — Programmable Array Logic
• UTC — Coordinated Universal Time
• AT — Access Tandem
• DT — DWDM (Dense Wavelength Division Multiplexing) Terminal
• USD — United States Dollar
• TM — Technical Manual
• CLNP — ConnectionLess-mode Network Protocol
• KISS — Keep It Simple Stupid
• CTD — Cumulative Trauma Disorder
• CERT — Computer Emergency Response Team
• AS — Autonomous System
• NTIS — National Technical Information Service Technology Administration
• MS — Millisecond
• EEPROM — Electrically Erasable Programmable Read-Only Memory
• RFO — Reason For Outage
• OSHA — Occupational Safety and Health Act (1970)
• DTR — Data Terminal Ready
• YP — Yellow Pages
• RAD — Rapid Application Development
• EFT — Electronic Funds Transfer
• BIS — Bureau of Indian Standards
• DMA — direct memory access (computer term)
• AT&T — American Telephone and Telegraph (U.S. company, also known as "Ma Bell")
• UN — United Narions
• TS — Technical Specification
• DPC — Destination Point Code
• DNIS — Dialed Number Identification Service

• SBU — Strategic Business Units
• SSM — Source-Specific Multicast
• PSTN — Public Switched Telephone Network
• EPR — Ethylene-Propylene Rubber
• IW — Information Warfare
• MVS — Multiple Virtual Storage
• CC — Call Control
• ECN — Explicit Congestion Notification
• SCM — Supply Chain Management
• RFS — Request For Service
• ASQC — American Society for Quality Control's
• SEM — Space Environment Monitor
• HW — Hardware
• PM — Project Manager
• FCC — Federal Communications Commission (US)
• CDMA — Code Division Multiple Access (voice/data transmission)
• SVP — Senior Vice President
• CS — Cable Select
• WMAN — Wireless Metropolitan Area Network
• CBDS — Connectionless Broadband Data Service
• HDML — Handheld Device Markup Language
• RDP — Radar Data Processing
• NESDIS — National Environmental Satellite, Data, and Information Service
• DTI — Department of Trade and Industry (UK)
• VM — Virtual Machine
• TLS — Transport Layer Security
• SAE — Society of Automotive Engineers
• SIL — Speech Interference Level
• DOM — Document Object Model
• COO — Cost of Ownership
• ISSN — International Standard Serial Number (ISO 3297)
• MHS — Microwave Humidity Sounder
• VB — Visual Basic
• MPI — Message Passing Interface
• ATN — Aeronautical Telecommunication Network
• OM — Old Man
• KHZ — kilohertz (1000 cycles per second)
• AMT — Amount
• BRI — Basic Rate Interface
• RACF — Resource Access Control Facility
• IANA — Internet Assigned Numbers Authority
• AML — Amplitude Modulated Link
• ISBN — International Standard Book Number (ISO 2108)
• BNSC — British National Space Centre
• AWG — American Wire Gauge
• ARA — Apple Remote Access
• UI — User Interface
• AXE 10 — Series of electronic telephone exchanges from L.M. Ericsson
• LSR — Local Service Request
• APC — American Power Conversion

• OTN — Optical Transport Network
• TNX — Thanks
• STI — Speech Transmission Index
• COMJAM — Communications Jamming
• FCS — Frame check sequence (Ethernet)
• IP — Intellectual Property
• AR — Access Rate
• IDT — Integrated Digital Terminal
• RTS — Request To Send
• PDS — Protected Distribution System
• IS — International Standard
• IPX — Internetwork Packet Exchange
• ROFL — Rolling on the floor laughing
• B2B — Business to Businesse
• PRF — Pulse Repetition Frequency
• GB — Gigabyte
• HF — High Frequency
• SVC — Scalable Video Coding
• MS — Management System
• CG — Coast Guard
• PBX — Private Branch eXchange (company phone system)
• EOT — End Of Transmission
• CEV — Controlled Environment Vault
• WMO — World Meteorological Organization (ICSU)
• SNR — Signal-to-Noise Ratio
• EDD — Envelope Delay Distortion
• LCN — Logical Channel Number
• WIPO — World Intellectual Property Organization
• JPEG — Joint Photographic Experts Group (24-bit image storage format)
• NRC — National Research Council (Canada)
• DSSS — Direct Sequence Spread Spectrum
• CATV — Community Antenna Television
• TCP/IP — transmission control protocol/internet protocol
• RTU — Remote Terminal Unit
• WS — Workstation
• HTTPS — HyperText Transfer Protocol Secure
• NI — Network Interface
• MDF — Main Distribution Frame
• CATV — Cable Television
• BRA — Basic Rate Access
• CO — Certificate of Origin
• PCI — Peripheral Component Interconnect
• AMI — Alternate Mark Inversion
• ARPU — Average Revenue Per User
• BSOD — Blue Screen Of Death
• SHA — Secure Hash Algorithm
• SA — Scientific American
• AFSK — Audio Frequency Shift Keying
• NOTAM — Notice to Airmen
• BPS — bits per second

• VOD — Video On Demand
• KM — Knowledge Management
• TBD — To Be Decided
• ISAS — Institute of Space and Astronautical Sciences (Japan)
• RTN — Regional Telecommunication Network
• ADC — Analog-Digital Converter
• E — Energy
• ISI — Inter-Symbol Interference
• NBS — National Bureau of Standards (US)
• FA — Functional Area
• 3G — Third Generation mobile phone network
• EPR — Electron Paramagnetic Resonance
• CORBA — Common Object Request Broker Architecture
• MCSD — Microsoft Certified Solution Developer
• FASB — Financial Accounting Standards Board
• ATSR — Along-Track Scanning Radiometer
• SSL — Secure Socket Layer
• PIN — Personal Identification Number
• OMS — Optical Multiplex Section
• DCS — Digital Cross-connect System
• AFS — Andrew File System
• PAN — Personal Area Network
• ASI — Asynchronous Serial Interface
• PABX — private automatic branch exchange (telephone)
• DIS — Distributed Interactive Simulation
• ITSEC — Information Technology Security Evaluation Criteria
• CABS — Carrier Access Billing System
• FXO — Foreign Exchange Office
• NIST — National Institute of Standards & Technology (US)
• AT&T — American Telephone & Telegraph
• COM — Component Object Model
• TE — Traffic Engineering
• ADN — Advanced Digital Network
• EISA — Extended Industry Standard Architecture
• AVL — Available
• VOL — Volume
• DASD — Direct Access Storage Device
• IEC — International Electrotechnical Commission
• LPC — Linear Predictive Coding
• UAN — Universal Access Number
• ADT — Atlantic Daylight Time (UTC-3 Hours)
• RH — Relative Humidity
• UA — User Agent
• VOP — Voice Over Packet
• ISA — Industry Standard Architecture
• CA — Certificate Authority
• F — Fellow
• FCA — Free Carrier Absorption
• DIBL — Drain-induced Barrier Lowering
• LD — Long Distance

• TEC — Total Electron Content
• IN — Intelligent Network
• AIS — Alarm Indication Signal
• WB — Write Back
• RSVD — Reserved
• ROS — Return on Sales
• DCOM — Distributed Component Object Model
• MSU — Microwave Sounding Unit
• NIC — Network Information Center
• DS — Digital Signal
• MAC — Media Access Control
• CGI — Computer-Generated Imagery
• TB — Terabyte
• NLMS — Normalized Least Mean Square
• AU — Audio Unit
• TOP — Technical Office Protocol
• NTFS — New Technology File System
• SM — Senior Member
• SCTP — Stream Control Transmission Protocol
• SNMP — Simple Network Management Protocol (ATM)
• B2C — Business-to-Consumer
• EAS — Extended Area Service
• PST — Pacific Standard Time (UTC-8 Hours)
• ES — Errored Second
• ZIP — Zone Information Protocol
• MC — Message Center
• MIME — Multipurpose Internet Mail Extension
• WG — Working Group
• ACR — Attenuation Crosstalk Ratio
• CIS — CompuServe Information Service
• MIPS — Millions of Instructions Per Second
• EDT — Eastern Daylight Time
• RCV — Receive
• BYOD — Bring Your Own Device
• ELINT — Electronic Intelligence Satellite
• OFC — Office
• D-RAM — Dynamic Random Access Memory
• SCADA — Supervisory Control And Data Aquisition
• UL — Uplink
• EDP — Electronic Data Processing Plc (London Stock Exchange [LSE])
• LF — Line Feed
• ASR — Access Service Request
• ECT — Explicit Call Transfer
• ELF — Extremely Low Frequency
• RMS — root mean square (preferred over "RMS")
• EPABX — Electronic Private Automatic Branch Exchange
• CAB — Conformity Assessment Body
• STP — Spanning Tree Protocol
• P — Predicted
• MRC — Monthly Recurring Charge

• DSP — Digital Signal Processor
• IP — Intelligent Peripheral
• LPE — Liquid Phase Epitaxy
• DAP — Directory Access Protocol
• MSR — Microwave Scanning Radiometer
• PPP — Point-to-Point Protocol
• VLF — Very Low Frequency
• FR — Frame Relay
• PM — post meridian
• HSS — Home Subscriber Server
• SEC — Software Engineering Center
• ACTV — Active
• LMS — Learning management system
• NIS — Network Information Service
• M — Management
• ESTEC — European Space Research and Technology Centre
• MDA — Model Driven Architecture
• FCP — Fibre Channel Protocol
• WTO — World Trade Organisation
• CRO — Central Records Office
• ECP — Engineering Change Proposals
• SPI — Service Provider Interface
• ECMA — European Computer Manufacturer's Association
• MSE — Mobile Subscriber Equipment
• MME — Mobility Management Entity
• ASR — Automatic Speech Recognition
• APPL — Application
• 1000BASE-T — 1000 Megabits per Second, Baseband, Twisted Pair
• DA — Destination Address
• CT — Computer Telephony
• NCS — National Communications System
• CAN — Campus Area Network
• DMARC — Demarcation point
• C4 — Command, Control, Communications, and Computers
• CAC — Carrier Access Code
• USGS — United States Geological Survey (DOI)
• BGP — Border Gateway Protocol (routing protocol)
• AMLCD — Active Matrix Liquid Crystal Display
• AEW — Airborne Early Warning
• DVP — Digital Voice Privacy
• EMC — Electromagnetic Compatibility
• NAFTA — North American Free Trade Agreement
• MD — Mediation Device
• ASQ — Alpha System Qualification
• IIS — Internet Information Services
• CAV — Constant Angular Velocity
• BACP — Bandwidth Allocation Control Protocol
• DCP — Design Change Package
• SML/SMS — Service Management Layer/Service Management Service
• PD — Public Domain

• OAS — Organization of American States
• SCP — Service Control Point
• NLM — National Library of Medicine (National Institutes of Health)
• STA — State
• MCU — Multipoint Control Unit
• ARPANET — ARPA Network
• WAP — Wireless Application Protocol
• TG — Task Group
• ICANN — Internet Corporation for Assigned Names and Numbers
• PGA — Programmable Gate Array
• TCSEC — Trusted Computer System Evaluation Criteria
• CMP — Connection Management Protocol
• AFP — AppleTalk Filing Protocol
• VLL — Virtual Leased Line
• ECE — Economische Commissie voor Europa (United Nations) (Dutch: Economic Commission for Europe)
• STM — Short Term Memory
• ANI — Automatic Number Identification (Caller ID)
• FUP — Fair Use Policy
• GDS — Global Distribution System
• TWT — Traveling Wave Tube
• MP — Multilink Protocol
• RT — Remote Terminal
• RDF — Radio Direction Finder
• CF — Compact Flash
• DID — direct inward dial
• ESS — Electronic Switching System
• CSO — Customer Service Operations
• MTSO — Mobile Telephone Switching Office
• DSN — Deep Space Network - network of large antennas and communication facilities.
• MMU — Memory Management Unit
• BUS — Business
• CSPRM — Common Signaling Protocols Resource Module
• CCTA — Central Computer and Telecommunications Agency
• RA — Risk Analysis
• SPADATS — Space Detection And Tracking System
• BT — BlueTooth
• TRM — Technical Reference Model
• SOAP — Simple Object Access Protocol
• CTS — Clear To Send
• EMS — Express Mail Service
• LEC — Local Exchange Carrier
• AMHS — Automated Message Handling System
• RFD — Request For Discussion
• CRIS — Carrier Route Information System
• STP — Signal Transfer Point
• BOC — Bell Operating Company
• DUP — Duplicate
• ADEOS — ADvanced Earth Observing Satellite (Japan)
• PVC — Permanent Virtual Circuit (ATM)
• TAG — Technical Advisory Group for Biological Control Agents of Weeds

• GOS — Grade Of Service
• RARP — Reverse Address Resolution Protocol
• WPM — speech--words per minute
• TN — Telephone Number
• NMS — Network Management System
• SVD — Singular Value Decomposition
• T&C — Terms & Conditions
• JST — Japan Standard Time
• BS — Beam Splitter
• FTTH — Fiber To The Home
• EMR — Electromagnetic Radiation
• PUB — Publication (file name extension)
• NCSA — National Center for Supercomputing Applications
• AOI — Area Of Interest
• DBS — Direct Broadcast Satellite
• MIB — Management Information Base (ATM)
• OPC — Originating Point Code
• OSTP — Office of Science and Technology Policy
• FITS — Flexible Image Transport System
• ASIC — application-specific integration circuit
• STK — Satellite Tool Kit
• CMT — Cadmium Mercury Telluride
• BERT — Bit Error Rate Tester (telecommunication)
• Y — Yttrium
• DDS — Digital Data Service
• SAN — System Area Network
• LZ — Landing Zone
• ADCCP — Advanced Data Communications Control Procedures
• CG — Center of Gravity (DXS)
• SW — South West
• CSAT — Customer Satisfaction
• OLAP — Online Analytical Processing
• WPS — Wireless Priority Service
• SAR — Specific Absorption Rate
• PDC — Personal Digital Cellular
• PSD — Phase-Sensitive Detector
• SBC — Session Border Controller
• SPC — Statistical Process Control. Forerunning quality theory from the 1960s to TQC and TQM.
• AAS — Adaptive Antenna System
• PKI — Public Key Infrastructure (cryptography)
• SHF — Super High Frequency
• DUC — Digital Up-Converter
• MCD — Magnetic Circular Dichroism
• SIT — Static Induction Transistor
• ROSAT — Roentgen Satellite
• RQMT — Requirement
• YL — Young Lady
• EAC — Engineering Accreditation Commission
• BIOS — Basic Input Output System
• ECR — Electronic Cash Register

• LDAP — Lightweight Directory Access Protocol (pronounced Ell-dap)
• MTU — Maximum Transmission Unit
• AYT — Are You There
• CHF — Swiss Franc
• DX — Duplex
• YYP — Yahoo Yellow Pages
• PPARC — Particle Physics and Astronomy Research Council
• FE — Far End
• SLP — Service Location Protocol
• BIP — Band Interleaved by Pixel
• OC — Optical Carrier
• MCA — Micro Channel Architecture
• LEP — Large Electron Positron
• JVM — Java Virtual Machine
• VOIP — Voice Over IP (Internet Protocol)
• NOC — Network Operations Center
• STN — Station Casinos, Inc.
• RSVP — Resource Reservation Protocol (Internet)
• TO — Technical Order
• DNS — Domain Name Service
• ASEAN — Association of South East Asian Nations
• OLE — Object Linking and Embedding (Microsoft communication protocol)
• RSRQ — Reference Signal Received Quality
• CCSD — command communications service designator; control communications service designator
• CFD — computational fluid dynamics
• BG — Background
• DC — Disconnected
• PCMCIA — Personal Computer Memory Card International Association
• BPDU — Bridge Protocol Data Unit
• APM — Advanced Power Management
• CIFS — Common Internet File System
• DAL — Dedicated Access Line
• OTS — Optical Transmission Section
• IRDA — Infrared Data Association
• TLC — The Learning Channel
• DID — Digital Information Display
• CGM — Computer Graphics Metafile
• SPGA — Staggered Pin Grid Array
• OAM&P — Operations, Administration, Maintenance & Provisioning
• MOL — Manned Orbiting Laboratory
• RT — Radiotelephone
• RSN — Real Soon Now [which may be a long time coming]
• ECAC — European Civil Aviation Conference
• ARINC — Aeronautical Radio Incorporated
• IS — Information System
• LEN — Line Equipment Number
• SVC — Switched Virtual Connection
• ARC — Army Reuse Center
• CFA — Carrier Facility Assignment
• EFS — Encrypting File System

• AIN — Advanced Intelligent Network
• RAN — Radio Access Network
• VC — Virtual Channel
• DCS — Digital Cross-Connect
• DEC — Decimal
• WWAN — Wireless Wide Area Network
• LU — Logical Unit
• TE — Test Equipment
• STP — standard temperature and pressure (0° and 1 atm)
• PAP — Password Authentication Protocol (ATM)
• SL — Single Line
• METRO — Metropolitan
• CBP — Coded Block Pattern
• CU — Channel Unit
• ETS — European Telecommunication Standard
• WPAN — Wireless Personal Area Network
• ASARS — Advanced Synthetic Aperture Radar System
• CNM — Customer Network Management
• DRM — Digital Rights Management
• ADL — Advanced Distributed Learning
• 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
• AAF — Advanced Authoring Format
• TOS — Temporarily Out of Service
• ARIN — American Registry for Internet Numbers
• SCN — Switched Circuit Network
• 10BASE-T — 10 Megabits per second, Baseband, Twisted pair
• Y — Yes
• FAX — Facsimile
• IV — Initialization Vector
• LLU — Local Loop Unbundling
• ATA — Analog Telephone Adapter
• CES — Consumer Electronics Show
• DC — Display Controller
• CER — Cell Error Ratio
• APS — Automatic Protection Switching (SONET/SDH)
• E&M — ear and mouth (special signaling leads)
• AM — Activity Manager
• CMD — Command
• PDS — Planetary Data System
• ACT — Activity
• UPS — Uninterruptible Power Supply
• NNM — Network Node Manager
• MOD — Modify
• DOT — Department of Telecommunications (India)
• FAA — Federal Aviation Agency
• QPSK — aeronautical quadrature phase shift keying
• ROTFL — Roll On The Floor Laughing
• CAPS — Call Attempts Per Second
• ECP — Encryption Control Protocol
• EIP — Equipment installation procedure

• FR PVC — Frame Relay Permanent Virtual Connection
• CD — Critical Dimension
• IRS — Interface Requirements Specification
• VAS — Value Added Services
• VGA — Video Graphics Array
• CCD — Charge Coupled Device - a device for the movement of electrical charge.
• A — Anode
• NIC — Network Interface Controller
• ECPA — Electronic Communications Privacy Act 1986
• ARG — Argument
• EX — Exercise
• EAI — Enterprise Application Integration
• DCMI — Dublin Core Metadata Initiative (Online Computer Library Center)
• TSR — Telecommunications Service Request
• EEA — European Economic Area
• CDC — Connected Device Configuration
• FE — Finite Element
• NNTP — Network News Transfer Protocol
• CB — Common Battery
• CMC — Career Management Center
• KB — Kilobyte: One thousand and twenty-four bytes kbps kilo bit per second
• DCN — Disconnect
• Q — Quadrature
• BS — Broadcast Satellite
• RCS — Radar Cross Section
• DL — Digital Library
• RT — Response Time
• VXML — Voice eXtensible Markup Language
• PS — Product Specification
• IMSI — International Mobile Subscriber Identity
• TE — Terminal Equipment
• E — Echo
• PDN — Packet Data Network
• MBPS — Megabits per second
• HTML — Hyper Text Markup Language
• DSLAM — Digital Subscriber Line Access Multiplexer (Module)
• AUD — Audit
• PCM — Pulse-Code Modulation
• ACPI — Advanced Configuration and Power Interface
• SF — Single Frequency
• 9 — Nine
• YAHOO — You Are Hazy Over Oranges
• FDL — Facility Data Link
• CAD — Computer-Aided Design
• SATAN — Security Administrator Tool for Analyzing Networks
• CBEMA — Computer & Business Equipment Manufacturers Association
• PTA — Pakistan Telecommunication Authority
• BTC — Botswana Telecommunications Corporation
• ITP — Interactive Telecommunications Program
• FAT — File Allocation Table

• TCM — Trellis-Coded Modulation
• RJ-25 — Registered Jack type 25 (6-wire connector)
• TI — Time Interval
• MGMT — Management
• IRS — Inertial Reference System
• VT — Vacuum Tube
• DCS — Digital Cellular System
• 100BASE-T4 — 100 Megabits per Second, Baseband, Four-pair Category 3 UTP cables
• CDA — Command and Data Acquisition
• SD — Software Development
• ACT — ACTIVITY, ACTIVITIES
• SOGA — Share of Gross Adds
• PE — Probable Error
• CO — Central Office
• BOFH — Bastard Operator From Hell
• CS — Convergence Sublayer (ATM)
• HDSL — High-bit-rate Digital Subscriber Line
• AN — Access Node
• MPLS — Multi Protocol Label Switching
• DID — data item description
• BOD — Bandwidth on Demand
• VOC — Volatile Organic Compounds (air pollution)
• AFM — Atomic Force Microscopy
• AS — Access System
• TCR — Temperature Coefficient of Resistance
• NFPA — National Fire Protection Association
• ACF — Access Control Field
• EOB — End Of Business
• CAM — Content Addressable Memory
• MX — Mixer
• BSS — Basic Service Set
• NIMBY — Not In My Back Yard
• 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)
• SRS — Software Requirements Specifications
• UP — User Profile
• MIT — Massachusetts Institute of Technology (U.S.)
• POTS — Plain Old Telephone Service (FCW)
• SDH — Synchronous Digital Hierarchy (ATM)
• WLAN — Wireless Local Area Network
• 911 — Emergency Services Phone Number
• ELT — Emergency Locator Transmitter
• SKU — Stockkeeping Unit
• LQR — Linear Quadratic Regulator
• CFD — Call For Discussion
• ATC — Advanced Technology Center
• ARQ — Automatic Repeat-reQuest
• PMP — Project Management Professional
• FSK — Frequency-Shift Keying
• EFIS — Electronic Flight Information System
• SML — Service Management Layer

• UML — Unified Modeling Language (Object Management Group, OMG)
• IMC — Intermediate Metal Conduit
• 2W — Two Wire
• RSS — Really Simple Syndication
• ACLR — Adjacent Channel Leakage Ratio
• ECM — Electronic Counter Measures
• FWA — Fixed Wireless Access
• ABN — Abnormal
• NPA — Numbering Plan Area
• SAS — Special Access Surcharge
• EC — European Community
• SUS — Suspension
• DPL — Digital Power Line
• PIC — Peripheral Interface Controller
• NCSC — National Computer Security Center (NSA)
• IT — Integration Test
• PG — Page
• SDK — Software Development Kit (Microsoft)
• DNIC — Data Network Identification Code
• DTMF — Dual-Tone MultiFrequency
• TDOA — Time Difference Of Arrival
• ESF — Edge Spread Function
• HEHO — Head End Hop Off
• BIU — Bus Interface Unit
• IMEI — International Mobile Equipment Identity
• SPM — Scanning Probe Microscope
• VSAT — Very Small Aperture Terminal (satellite service)
• ADF — automatic document feeder
• BCH — Binary Coded Hexadecimal
• COPS — Common Open Policy Service
• LT — Less Than
• TMS — Time Management System
• VT — Virtual Terminal
• PVD — Physical Vapor Deposition
• ADP — Automatic Data Processor
• 100BASE-T — 100 Megabits per second, Baseband, Twisted pair
• TTY — Teletype Telex Machine
• ODBC — Open Database Connectivity
• FEP — Front-End Processor
• AIFF — Audio Interchange File Format
• FEP — Front End Processor
• GHZ — Gigahertz
• BSS — Base Station Subsystem
• JAN — Joint Army-Navy
• PET — positron emission tomography
• SMB — Server Message Block
• EM — Electromigration
• NSAI — National Standards Authority of Ireland
• CBWFQ — Class Based Weighted Fair Queueing
• SIM — Subscriber Identity Module

• RP — Reference Point
• EHF — Extremely High Frequency
• WINS — Windows Internet Name Service
• SA — Source Address
• TDMA — Time Division Multiple Access
• FRS — Frame Relay Service
• EMEA — Europe, Middle East and Africa
• MAI — Multiple Access Interference
• VOA — Voice Of America
• TLK — Talk
• SDLC — Synchronous Data Link Control
• PC — Peripheral Controller
• NA — Network Adapter
• BBM — Blackberry Messenger
• DDN — U.S. Defense Data Network
• CQA — Certified Quality Auditor
• B3G — Beyond Third Generation
• AAV — Accountholder Authentication Value
• ISM — Industrial, Scientific and Medical
• EGP — Exterior Gateway Protocol
• E — Echo Time Zone
• MIDP — Mobile Information Device Profile
• CBR — Constant Bit Rate
• WAIS — Wide Area Information Server
• LNP — Local Number Portability
• SZ — Seizure
• OSCAR — Orbiting Satellite Carrying Amateur Radio
• ESP — Encapsulating Security Payload
• TDM — Time Division Multiplexer
• OTA — Office of Technology Assessment (U.S.; abolished by Congress, Fall 1995)
• TOVS — TIROS Operational Vertical Sounder
• NES — Network Encryption System
• PDT — Portable Data Terminal
• COMDEX — Computer Dealers Exposition
• SMR — Specialized Mobile Radio
• B-ISDN — Broadband Integrated Services Digital Network
• CFV — Call For Vote(s)
• DDL — Digital Data Link
• B6ZS — Bipolar 6 Zero Substitution
• CTU — Central Terminal Unit
• FEC — Forward Error Correction
• BAN — Base Area Network
• NTP — Network Time Protocol
• CGA — Carrier Group Alarm
• DAT — Digital Audio Tape
• C — Cost
• SB — Switchboard
• RMI — Remote Method Invocation
• ES — Emergency Service
• BJT — Bipolar Junction Transistor

• PM — Phase Modulation
• PIM — Personal Information Manager
• QDR — Quad Data Rate
• TOA — Time Of Arrival
• BSA — Business Software Alliance
• TEL — Telephone
• BS — Backing Store
• VBR — Variable Bit Rate (ATM)
• TSB — Telecommunication Standardization Bureau
• FRS — Family Radio Service
• NOAO — National Optical Astronomy Observatories (Tucson, AZ)
• DS-0 — Digital Signal, Level 0
• SPA — Software Publishers Association
• TIA — Telecommunications Industry Association
• JCL — Job Control Language
• ACAP — Application Configuration Access Protocol
• TSE — Toronto Stock Exchange
• GDM — GSM (Global System for Mobile communications) Data Module
• NE — North-East
• CPC — Continous Packet Compression
• ACE — Adaptive Communication Environment
• ORB — Object Request Broker
• WTLS — Wireless Transport Layer Security
• TTY — Text Teletype
• ADT — American District Telegraph Company
• BER — Basic Encoding Rules (ASN.1)
• PEM — Privacy-Enhanced Mail
• CAP — Capability
• IESG — Internet Engineering Steering Group
• MV — Motion Vector
• SLV — Satellite-Launch Vehicle
• RADIUS — Remote Authentication Dial-In User Service
• EMCON — Electromagnetic Emission Control
• MDM — Mobile Device Management
• EIGRP — Enhanced Interior Gateway Routing Protocol
• PU — Physical Unit (IBM)
• ATS — Automatic Transfer Switch
• FAS — Frame Alignment Signal
• SPX — Sequenced Packet Exchange
• COAX — Coaxial
• ISOC — Internet Society
• 2W — 2-Wire
• ITT — Invitation To Tender
• BIS — Business Information System
• SRM — Scalable Reliable Multicast
• CB — Citizens' Band
• AP — access point
• XPS — X-Ray Photoelectron Spectroscopy
• HEX — Hexadecimal (base 16)
• ASDE — Airport Surface Detection Equipment

• DIS — Draft International Standard
• NSS — Network Switching Subsystem
• LASA — Large Aperture Seismic Array
• TDD — Time Division Duplex
• EIA — Extended Interaction Amplifier
• E — Electra
• TTY — teletype terminal
• CDE — Common Desktop Environment
• MCC — Mission Control Center (JSC)
• VMS — Virtual Memory System
• SWAP — Shared Wireless Access Protocol
• CS-PDU — Convergence Sublayer - Protocol Data Unit
• CSC — Common Signaling Channel
• IEC — Interexchange Carrier
• VBA — Visual BASIC for Applications
• DL — Data Link
• ISAKMP — Internet Security Association and Key Management Protocol
• IRC — International Record Carrier
• LISP — List Processing Language
• DTD — Document Type Definition (XML)
• ADN — Abbreviated Dialing Number
• AIT — Automatic Identification Technology
• CGSA — Cellular Geographic Service Area
• O/S — Operating System
• KAK — Key-Auto-Key
• BHCA — Busy Hour Call Attempt
• VLSI — Very-Large-Scale Integration
• SAR — synthetic aperture radar (satellite)
• SIL — Silence
• DER — Distinguished Encoding Rules
• RRN — Routing Recording Number
• PP — Polypropylene
• SLIC — Subscriber Line Interface Circuit
• DMI — Distributed Management Interface
• DCE — Data Communication Equipment
• COMINT — Communications Intelligence
• TAD — Telephone Answering Device
• AMSS — Automatic Message Switching System
• EECM — End-to-End Call Manager
• MPEG — Motion Picture Experts Group
• NIU — Network Interface Unit
• CPS — Cycles Per Second (now Hertz)
• ASA — Acoustical Society of America
• AWACS — Airborne Warning And Control System
• PCI — Personal Computer Interface
• PSS — Performance Support System
• DSS — Digital Signature Standard
• POE — power over ethernetinjector
• LD — Laser Diode
• WHT — Walsh-Hadamard Transform

• IEEE — Institute of Electrical and Electronics Engineers
• LATA — Local Access and Transport Area
• PVC — Permanent Virtual Connection
• DAP — Distributed Array Processor
• CPS — characters per second
• AC — Area Code
• DPL — Digital Private-Line
• SPD — Serial Presence Detect
• DII — Dynamic Invocation Interface
• COM — Comedy Central
• TRMM — Tropical Rainfall Measuring Mission (US-Japan)
• HFC — Hybrid Fiber/Coaxial network
• SQ — Service Quality
• SG — Signaling Gateway (IETF)
• MIS — Management Information Service
• JTF — Joint Task Force
• DII — Defense Information Infrastructure
• IPS — InPlane Switching
• VF — Voice Frequency
• BTAM — Basic Telecommunications Access Method
• HLR — Home Location Register
• ER — Extended Range
• FLM — First Line Maintenance
• MLP — Mobile Location Protocol
• PROM — Programmable Read-Only Memory
• DPSK — Differential Phase Shift Keying
• TKIP — Temporal Key Integrity Protocol
• DTN — Data Transfer Network
• EST — Establish
• DPDU — Data Protocol Data Unit
• STD — Subscriber Trunk Dialing
• CSPDN — Circuit Switched Public Data Network
• DMS — Data Management System
• LRC — Learning Resource Center
• GMRS — General Mobile Radio Service
• CVR — Crystal Video Receiver
• SIA — Securities Industry Association
• KDC — Kerberos Key Distribution Center
• JRE — Java Runtime Environment
• BSS — Base Station System
• ASTD — American Society of Training and Development (Alexandria, Virginia)
• EU — End User
• 1FB — Single line, Flat Business rate;
• MTS — Message Transfer System
• ADB — Apple Desktop Bus
• NDVI — Normalized Difference Vegetation Index
• CAM — Common Access Method
• APN — An Access Point Name
• RCC — Radio Common Carrier
• CRLF — Carriage-Return Line-Feed

• SPIN — Service Provider Identification Number
• 3GPP — Third Generation Partnership Project
• BA — Behaviour Aggregate
• FDTD — Finite Difference Time Domain
• CAL — Calorie
• SLAM — Scanning Laser Acoustic Microscope
• VG — Voice Grade
• SD — Speed Dial
• DEMUX — Demultiplexer
• SIL — Solid Immersion Lens
• OMA — Open Mobile Alliance
• DN — Distinguished Name
• CP — Change Proposal
• SSRC — Synchronization Source
• P — Priority
• OTDOA — Observed Time Difference of Arrival
• FEXT — Far-End Cross Talk
• NRPB — National Radiological Protection Board
• FITL — Fiber-In-The-Loop
• ETF — Early Termination Fee
• MBWA — Mobile Broadband Wireless Access
• DVB — Digital Video Broadcasting
• CPN — Cisco Powered Network
• CIS — Computer and Information Science
• CP — Call Processing
• AFOSR — Air Force Office Of Scientific Research(USA)
• WE — Western Electric
• RNX — Restricted Numeric eXchange
• BMEWS — Ballistic Missile Early Warning System (bee-mews)
• CODEC — Coder/decoder
• CE — Channel Element
• FH — Frequency Hopping
• IAB — Internet Architecture Board
• RDI — Remote Defect Indicator (UNI Fault Management)
• ADC — Administration Center
• FOSE — Federal Office Systems Exposition
• CS — Central Station
• DDD — Direct Distance Dialing
• AMPS — Advanced Mobile Phone Service (cellular phone standard)
• IRQ — Interrupt Request
• S/D — Source/Drain
• IAT — Integrated Access Terminal
• BMS — Business Management System
• DGPT — Directorate General of Posts and Telecommunications
• IOC — Inter-Office Channel
• FTTC — Fiber To The Curb光纤到路边
• TAM — Telephone Answering Machine
• SDU — Signal Distribution Unit
• IMP — Interface Message Processor
• AMPS — Advanced Mobile Phone System

• AP — Action Point
• MH — Message Handler
• CICS — Customer Information Control System (IBM Mainframe Software; Kicks Or C-I-C-S)
• VPI — Virtual Path Identifier
• SN — Stock Number
• OXCO — Oven-Controlled Crystal Oscillator
• ALT — Accelerated Life Test
• ISO — Independent System Operator (US) (see also TSO) Responsible for grid management, but does not own assets. (electricity)
• NCP — Network Control Protocol
• CI — Common Interface
• FRAD — Frame Relay Access Device
• DCS — Data Collection System (NOAA Polar Orbiting Satellites)
• RDS — Rate Determining Step
• GBT — Ground Based Tower
• DM — Domain Model
• TL1 — Transaction Language 1
• APDU — Application Protocol Data Units
• AIF — Audio Interchange Format
• WAYP — White and Yellow Pages
• T — Temperature
• DUA — Directory User Agent
• RACH — Random Access Channel
• IDF — Independent Distribution Frame
• CGA — Color Graphics Adapter
• CT — Computer Terminal
• DDU — Disk Drive Unit
• RTC — Real-Time Control
• TCIC — Trunk Circuit Identification Code
• CNG — comfort noise generation
• AWT — Agence Wallonne des Télécommunications
• COO — Cell of Origin
• OSP — Outside Plant
• SAF — System Access Fee
• CIP — Carrier Identification Parameter
• IPS — Instructions Per Second
• IRTF — Internet Research Task Force
• WDN — Wireless Developer Network
• ACP — Access Control Point
• TRS — Telecommunications Relay Service
• OT — Office of Telecommunications
• SN — Service Number
• SM — Service Module
• DHD — Dial Home Device
• EMR — Electromechanical Relay
• TAX — Trunk Automatic Exchange
• DDCMP — Digital Data Communications Message Protocol
• SRR — Search and Rescue Region
• CCNA — Cisco Certified Network Associated
• CONUS — Contiguous United States
• AMR — Automated meter reading also known as Automatic Meter Reading

• RMS — Resource Management System
• BSI — British Standards Institution
• TDD — Telecommunications Device for the Deaf
• SCU — System Control Unit
• TXM — Transmission X-ray Microscope
• DC — Device Control
• SSM — Synchronization Status Message
• MA — Maintenance Action
• CCIR — International Radio Consultative Committee (French Acronym)
• TFTP — Trivial File Transfer Protocol (ATM)
• ACC — Area Control Center
• OOP — Object-Oriented Programming
• FXS — Foreign Exchange Subscriber
• RISC — Reduced Instruction Set Computing
• CIAC — Computer Incident Advisory Capability
• V — Variable
• BCH — Bose-Chaudhuri-Hocquenghem Coding
• VCC — Virtual Channel Connection (ATM)
• OSS — Operations Support System
• TC — Transmission Convergence (ATM)
• C — Collector
• EIR — Equipment Identity Register
• TUR — Trunk Utilization Report
• CSA — Canadian Standards Association (like UL)
• NAT — Network Address Translation
• DL — Definition List
• TELECOMMUTE — Telecommuting
• NAK — Negative Acknowledge
• DSN — Defense Switched Network
• PTP — Point to Point Transmission Service (electricity)
• EMS — Element Management System (ATM)
• CRBT — Caller Ring Back Tone
• SSM — Spread Spectrum Modulation
• RJE — Remote Job Entry
• TSO — Telecommunications Service Order
• FOD — Fax on Demand
• RAU — Remote Access Unit
• EULA — End User License Agreement (usually in reference to software)
• ASD — Alternative Service Delivery
• LSI — Large Scale Integration -> VLSI
• BOSS — Binary Object Storage System
• SYM — Symmetric
• ST — Such That
• FMC — Fixed Mobile Convergence "Mobile UC or Unified Communications over Wireless"
• VTS — Vessel Traffic Service
• MPI — Minimum Picture Interval
• AVR — Automated Voice Response
• YABA — Yet Another Bloody Acronym
• BELLCORE — Bell Communications Research, Inc.
• MC — Maintenance Control

• SDM — Service Delivery Management
• TRS — Trunked Radio Systems
• POP — Post Office Protocol
• JDK — Java Development Kit
• 4GL — Fourth-Generation Language
• SMDS — Switched Multimegabit Data Service (ATM)
• RPV — Remotely Piloted Vehicle
• QI — Quality Indicator
• AOS — Alternate Operator Service
• EBCDIC — Extended Binary-Coded Decimal Interchange Code
• SNA — System Network Architecture
• ALB — Analog Loopback
• CLETS — California Law Enforcement Telecommunication System
• OD — Outside Diameter
• DDI — Direct Dialing Incoming
• MLM — Multi-Longitudinal Mode
• WAR — Weekly Activity Report
• DRFM — Digital Radio-Frequency Memory
• OML — Object Model Library
• 2G — Second Generation Wireless Systems
• MCP — Microsoft Certified Professional
• SITA — Société Internationale de Télécommunications Aéronautiques
• HSCSD — High-Speed Circuit-Switched Data
• IG — Interface Group
• SMPTE — Society of Motion Picture and Television Engineers, Inc.
• DPCM — differential pulse code modulation
• DCA — Dynamic Channel Assignment
• ABM — Asynchronous Balanced Mode
• PAM — Payload Assist Module
• ET — Electronic Transmission
• LOO — Likelihood of Occurrence
• IAD — Integrated Access Device
• SOS — Save Our Souls (Help!)
• SIM — Subscriber Identification Module
• ACSE — Association Control Service Element
• DISN — Defense Information Systems Network
• RAU — Radio Access Unit (Army)
• UART — Universal Asynchronous Receiver/Transmitter
• CIRC — Cross-Interleaved Reed-Solomon Code
• TCPA — Telephone Consumer Protection Act
• DTI — Digital Trunk Interface
• CMIP — Common Management Information Protocol (ATM)
• SDP — Software Development Plan
• FDD — Frequency Division Duplex
• NTDS — Naval Tactical Data System
• CAMA — Centralized Automatic Message Accounting
• RSL — Restricted Service License
• GSM — Groupe Speciale Mobile
• ISG — Information Systems Group
• UMA — Unlicensed Mobile Access

• LDN — Local Directory Number
• LDP — Label Distribution Protocol
• EA — Extended Address Field Bit
• NF — Noise Factor
• EMS — Enhanced Messaging Service
• HSPA — High Speed Packet Access
• COT — Central Office Terminal
• TOMS — Total Ozone Mapping Spectrometer (satellite Instrument)
• CMRS — Commercial Mobile Radio Service
• BNC — Bayonet Neill-Concelman
• MSW — Most Significant Word
• DFG — difference-frequency generation
• CIP — Channel Interface Processor
• BLER — Block Error Rate
• RJ-14 — Registered Jack type 14 (2-wire connector)
• DM — Differential Mode
• EDC — Electronic Dispersion Compensator
• BLOS — Beyond Line-Of-Sight
• PMT — Program Management Team
• DSI — Digital Speech Interpolation
• ARSR — Air Route Surveillance Radar
• DSCP — Differentiated Services Code Point
• DVMRP — Distance Vector Multicast Routing Protocol
• ILEC — Incumbent Local Exchange Carrier
• DTAP — Direct Transfer Application Process
• WORM — Write-Once, Read-Many
• SVC — Switched Virtual Circuit (ATM)
• RSS — Radio Service Software (Motorola)
• TOP — technical/office protocol
• MA — Message Analysis
• CLK — Clock
• EBIC — Electron Beam Induced Current
• VLAN — Virtual Local Area Network
• CDM — Conceptual Data Model
• RXQUAL — Received Signal Quality
• VN — Virtual Network
• EMI — Electro-Magnetic Interference
• L2TPV3 — Layer 2 Tunneling Protocol Version 3
• WWAN — wireless wide-area network
• ACA — Adaptive Channel Allocation
• NREN — National Research and Education Network
• CRTS — Cellular Radio Telecommunications Service
• SONET — Synchronous Optical Network
• LIF — Logical Interchange Format
• CND — Calling Number Display
• CMOS — Complementary Metal Oxide Semiconductors
• LRC — Longitudinal Redundancy Check
• DW — Deep Water
• CPG — Converged Packet Gateway
• ADC — Access Deficit Charge

• LS — Loop Start
• ASAR — Advanced Synthetic Aperture Radar 
• FGA — Feature Group A
• FGD — Feature Group D
• BSC — Bi-Synchronous Communications
• FAC — Forced Authorization Code
• 3G — 3rd Generation Wireless Format
• IEEE-CS — Institute of Electrical and Electronics Engineers Computer Society
• NII — National Information Infrastructure (USA)
• BOM — Bit-Oriented Message
• VHSIC — Very High-Speed Integrated Circuit
• CAC — Connection Admission Control (Asynchronous Transfer Mode)
• ESCA — photoelectron spectroscopy for chemical analysis
• ASYNC — Asynchronous
• CHTML — Compact Hypertext Markup Language
• RSS — root-sum-square
• CALEA — Communications Assistance for Law Enforcement Act
• IPM — Inches Per Minute
• EDFA — Erbium-Doped Fiber Amplifier
• SMI — Structure of Management Information
• AF — Assured Forwarding
• SWBD — Switchboard
• FEA — Finite Element Analysis
• BAN — Building Area Network
• KSU — Key Service Unit
• EBS — Electron Bombarded Silicon
• ANSI-41 — ANSI standard for mobile management
• ARM — Asynchronous Response Mode
• UDP — Up Down Pair
• AAL5 — ATM (Asynchronous Transmission Mode) Adaptation Layer 5
• MHO — My Humble Opinion
• LT — Line Termination
• LPD — Low Probability of Detection
• SCPC — single channel per carrier
• VRML — Virtual Reality Modeling Language
• LANE — Local Area Network Emulation
• SDSL — Symmetric Digital Subscriber Line
• OBC — Onboard Computer
• ALI — Automatic Location Information
• NAS — Network-Attached Storage
• GI — Graded-Index
• CRV — Call Reference Value
• FECN — Forward Explicit Congestion Notification (ATM)
• ECM — Error Correction Model
• ETSI — European Telecommunications Standard Institute
• REPT — Report
• 4W — Four-Wire
• MUSIC — MUltiple SIgnal Classification
• ISI — Intersymbol Interference
• FNN — Full National Number

• B2B — Business-to-Business
• ILD — International Long Distance
• GAN — Global Area Network
• AWG — arrayed waveguide grating
• REA — Rural Electrification Administration (US)
• PACS — Personal Access Communications System
• FC — Frame Control
• ASN.1 — Abstract Syntax Notation 1
• FTAM — File Transfer Access and Management
• FCA — Fixed Channel Allocation
• SISIR — Singapore Institute of Standards and Industrial Research
• WSDL — Web Services Description Language
• MP — Modulation Parameter
• CLDC — Connected Limited Device Configuration
• RMON — Remote Monitoring
• 3-D — 3-Dimensional
• VESA — Video Electronics Standards Association
• CRB — Cramer-Rao Bound
• TEI — Terminal Endpoint Identifier
• EVA — Electronic Video Agent
• CMA — Communications Management Association
• CAVE — Cellular Authentication and Voice Encryption Algorithm
• DARTS — Design Approach for Real-Time Systems
• TCP/IP — Transmission Control/Internet Protocol
• TIFF — Tag Image File Format
• CIC — Carrier Identification Code
• RDT — Recall Dial Tone
• OSF — Open Software Foundation
• VPA — Valid Peripheral Address
• CPC — Calling Party Control
• PLL — Phase Locked Loop
• ALOC — Average Length Of Call
• INSAT — Indian National Satellite
• FDI — Feeder Distribution Interface
• PUK — PIN (Personal Identification Number) Unlocking Key
• CCR — Customer Controlled Reconfiguration (Sprint)
• IPCP — Internet Protocol Control Protocol
• VSAM — Virtual Storage Access Method
• ICL — Inserted Connection Loss
• DLP — Data Link Processor
• CC — Country Code
• LSW — Least Significant Word
• AAS — advanced automation system (FAA)
• TCB — Telecommunication Certification Body
• COC — Central Office Connection
• DNSIX — Defense Network Security Information Exchange
• INE — Intelligent Network Element
• SSN — Switched Service Network
• INTELSAT — International Telecommunications Satellite
• ULL — Unbundled Local Loop

• EMF — Event Management Framework
• DISA — U.S. Defense Information Systems Agency
• WTS — Wireless Telecommunications Symposium
• DPT — Dynamic Packet Transport
• DXC — Digital Cross Connect
• CTI — Computer Telephony Integration
• AUI — Attachment Unit Interface
• DAC — Digital-To-Analog Converter
• WCDMA — Wideband Code Division Multiple Access
• MSRN — Mobile Station Roaming Number
• PARC — Palo Alto Research Center
• WVOIP — Wireless Voice over Internet Protocol
• DACS — Digital Access Cross-connect System
• RLU — Remote Line Unit
• SDP — Session Description Protocol
• CV — Coding Violation
• EEROM — Electronically Erasable Read-Only Memory
• PNP — Plug-and-Play
• TDRSS — Tracking and Data Relay Satellite System
• MAJ — Major
• ABBR — Abbreviation
• SIP — Session Initiation Protocol
• WARC — World Administrative Radio Conference
• TTYL — Type To You Later
• ASN.1 — Abstract Syntax Notation One
• NCF — Network Control Facility
• 3G — Third Generation (mobile communication system)
• CNG — Fax Calling Tone
• LCR — Least Cost Routing
• FOIP — Fax Over Internet Protocol
• STN — Station
• UAT — Universal Access Transceiver
• RDMA — Remote Direct Memory Access
• SETI — Search for Extraterrestrial Intelligence
• RICK — Repeater Interface Communications Kit
• TTL — ToS and Time-to-Live
• VPWS — Virtual Private Wire Service
• IPVX — Internet Protocol version X
• IRF — Impulse Response Function
• CFNRY — Call Forwarding on No Reply
• IMAP — Internet Mail Access Protocol
• TD — Transmit Data
• 1-ESS — x-ESS series of Electronic Switching Systems
• FMR — Follow Me Roaming
• TACACS — Terminal Access Controller Access Control System
• OMF — Object Management Framework
• FSAI — Fiber Serving Area Interface
• PBT — Polybutylene Terephthalate
• LFACS — Loop Facility Assignment and Control System
• ACF — Advanced Communications Function (IBM)

• SPA — Special Prorate Agreement
• TT — Text-Telephone
• LB — Local Battery
• IWF — Interworking Function
• GBPS — Gigabits per second
• BIS — Brought Into Service
• CCCH — Common Control Channel
• FSK — Frequency Shift Keying
• SRL — Singing Return Loss
• DTU — Data Transfer Unit
• DCF — Distributed Coordination Function
• MGC — Multimedia Gateway Controller
• IR — International Roaming
• 4G — Fourth Generation Wireless Systems
• LIS — Lightning Imaging Sensor
• IPLC — International Private Leased Circuit
• RGN — Region
• SCR — Sustainable Cell Rate
• RECON — Reconnaissance
• RADIUS — Remote Authentication dial In User Service
• CIP — Continuous Improvement Program
• LAG — Link Aggregation Group
• RDBMS — Relational Data Base Management System (Oracle)
• RX — Receive
• TACSAT — Tactical Satellite
• SE — Southeast
• SMS — Service Management System
• DOD — Direct Outward Dialing
• WSFL — Web Services Flow Language
• RCU — Radio Control Unit
• DCAS — Downloadable Conditional Access System
• LH — Link Handler
• DXF — Data Exchange Format
• VOB — Voice Over Broadband
• PDL — Positioning Data Link
• NDS — Novell Directory Services
• ATS — Abstract Test Suite
• CPE — Customer Premise Equipment
• MSDP — Multicast Source Discovery Protocol
• PSN — Packet Switched Network
• UMTS — Universal Mobile Telecommunications Service
• CPAP — Customer Premises Access Profile
• CLCC — Ceramic Leaded Chip Carrier
• L2TP — Layer 2 Tunneling Protocol
• CSU — Channel Service Unit
• TCA — Threshold Crossing Alert
• PSDN — Public Switched Digital Network
• VCI — Virtual Channel Identifier
• SN — Switching Network
• CCP — Compression Control Protocol

• MR — Mobile Router
• ESCON — Enterprise System Connection
• VLSI — Very Large-Scale Integration
• BT — Burst Tolerance
• ETN — Electronic Tandem Network
• ESPN — Entertainment and Sports Programming Network
• CODASYL — COnference on DAta SYstems Languages
• LIU — Line Interface Unit
• NRP — Network Resource Planning
• FMS — Fraud Management System
• SSMA — Spread-Spectrum Multiple Access
• NCAR — National Center for Atmospheric Research (US)
• NCC — Network Control Center (GSFC)
• DLCI — data link connection identifier
• ASE — Application Service Element
• PLCP — Physical Layer Convergence Procedure
• PTP — Point To point Protocol
• NC — Network Channel
• PIC — Programmable Interrupt Controller
• IEEE-SA — Institute of Electrical and Electronics Engineers - Standards Association
• 2G — Second generation cellular
• ELFEXT — Equal-Level Far-End Cross-Talk
• DQDB — Distributed Queue Dual Bus
• DPDT — Double-Pole Double-Throw
• CACH — Call Appearance Call Handling
• MMC — Microsoft Management Console (Microsoft)
• CCNA — Cisco Certified Network Administrator
• BY — Busy
• FPS — Framing Pattern Sequence
• DPA — Distributed-Power Architecture
• CSIRO — Commonwealth Scientific and Industrial Research Organization
• VSAT — Very Small-Aperture Terminal
• FI — Format Identifier
• F — Frequency
• CCITT — Comit? Consultatif International T?l?graphique et T?l?phonique
• DLL — Digital Local Line
• BCDIC — Binary Coded Decimal Interchange Code
• EGSM — Extended Global System for Mobile Communications
• STMR — Sidetone Masking Rating (telecommunications)
• TU — Transmission Unit
• ADCCP — Advanced Data Communication Control Procedures
• USA — Underground Service Alert
• DAS — Data Acquisition System
• PIM — Protocol Independent Multicast
• DIV — Divisionsion
• ATS — Air Traffic Services
• VTAM — Virtual Telecommunication Access Method
• UPT — Universal Personal Telecommunications
• ET — Exchange Terminal
• MMDS — Multichannel Multipoint Distribution Service

• ANC — Access Network Controller
• RCP — Right-Hand Circular Polarization
• 4 GIG — 4 Giga Intellectual Gadget
• CAR — committed access rate
• TRLR — Trailer
• DTE — Digital Terminal Equipment
• SIMT — Système interbancaire marocain de télécompensation
• LCP — Local Control Point
• PTT — Push to Talk Technology
• DA — deca
• ADPC — Automatic Data Processing Center
• BAF — Bellcore AMA (Automatic Message Accounting) Format
• MITI — Ministry of International Trade and Industry
• CTIA — Cellular Telecommunications Industry Association
• CRS — Cell Relay Service
• FTTP — Fiber To The Premises
• CVD — Chemical Vapor Deposition
• WFA — Wait for Answer
• UIT — Union Internationale des Télécommunications
• TLT — Test Loop Translator
• FCA — Free Carrier Alongside
• ADM — Administration Building
• SSAP — Source Service Access Point
• RDT — Remote Digital Terminal
• ERL — Echo Return Loss
• RTB — Retransmission Buffer
• AMA — automatic message accounting
• DICOM — Digital Imaging and Communications in Medicine
• TDWR — Terminal Doppler Weather Radar
• 3GPP — Third-Generation Partnership Project
• BUFR — Binary Universal Form for the Representation (of data)
• TBCD — Telephony Binary Coded Decimal
• ESN — Electronic Serial Number
• SS1 — Signalling System 1 (500/20 Hz tones)
• IV&V — independent verification and validation
• CID — Craft Interface Device
• EM — Element Manager
• SCCS — Switching Control Center System
• 3G HSPA — Third-Generation High-Speed Packet Access
• OSA — Open System Architecture
• DE — Discard Eligibility (ATM)
• RQMTS — Requirements
• CON — Concentrator
• VSM — Vestigial Sideband Modulation
• FTTK — Fibre To The Kerb
• LCF — Location Confirm
• DOCSIS — Data over Cable Service Interface Specification
• ARFA — Allied Radio Frequency Agency
• WDA — Wireless Digital Assistant
• TELNET — Telecommunications Network Protocol

• PDSO — Packet Data Security Overlay
• RP — Radio Port
• DIL — Direct Inward Line
• CTE — Computer Telephony Engineer
• GERAN — GSM (Global System for Mobile communications) Edge Radio Access Network
• MF — Multiple Frequency
• TM — Thematic Mapper (Landsat)
• DRQ — Disengage Request
• EDSX — Electronic Digital Signal Cross-Connect
• HFC — Hybrid Fiber Coaxial
• RFR — Radio Frequency Radiation
• YA — Yet Another
• MFC — Multi-Frequency Code
• HTML — Hyper-Text Markup Language
• CPH — Call Party Handling
• GDK — GIMP (GNU Image Manipulation Program) Drawing Kit
• CTO — Commonwealth Telecommunications Organisation
• L2F — Layer 2 Forwarding protocol
• USF — Universal Service Fund
• SAT — Satellite
• DMT — Discrete Multi-Tone Technology
• BATM — Basic Telecommunication Access Method
• TP — Telephone Pole
• SSP — Security Service Provider
• LIM — Line Isolation Monitor
• WK — Week
• PCCA — Portable Computer Communications Association
• DPBX — Digital Private Branch Exchange
• PD — Pulse Duration
• CC — Composite Clock (SONET)
• NCP — Network Control Program
• BSID — Base Station Identity
• LI — Length Indicator
• MTD — Moving Target Detection
• VPX — Virtual Path Cross-Connect
• MMM — Mobile Media Mode
• CPOP — Circuit Precedence Over Packet data
• OMP — Open Management Platform
• RIPE NCC — Reseaux IP Europeens Network Coordination Centre
• NE — Network Element
• VR — Virtual Router
• MTI — Moving Target Indicator
• TBPS — Terabits Per Second
• EFCI — Explicit Forward Congestion Indication (ATM)
• CSR — Customer Service Report
• URN — Uniform Resource Namespace
• VDR — Voice Digitization Rate
• MTA — Message Transfer Agents (Internet)
• CAM — Computer-Aided Manufacturing
• CLD — Cross-Layer Design

• UBR — Unspecified Bit Rate
• ACF — Access Coordination Function
• CAPTAIN — Character And Pattern Telephone Access Information Network
• GS — Ground Start
• COFA — Change Of Frame Alignment
• LRQ — Location Request
• BSA — Basic Service Area
• MSC — Mobile Switching Center
• CRBT — Color Ring Back Tone
• FDOA — Frequency Difference Of Arrival
• LAAS — Local Area Augmentation System
• EV — electronvolt
• LAPB — Link Access Protocol-Balanced
• DUV — Deep Ultraviolet
• VISSR — visible and infrared spin scan radiometer (GOES)
• MLA — Modern Language Association
• LRM — Long Reach Multimode
• CLEC — Competitive Local Exchange Carrier
• FIOS — Fiber Optic Services
• W-CDMA — Wideband Code Division Multiple Access
• DTL — Defense Telephone Link
• SPID — Service Profile Identifier
• DS-3 — Digital Signal, Level 3
• OCC — Occupancy
• TSC — Test System Controller
• MAP — Mobile Application Part
• CDV — Cell Delay Variation(ATM)
• VNS — Virtual Network System
• NT — New Technology, also Windows NT
• DSSSL — Document Style Semantics and Specification Language
• 4WAI — Four-Wire Analog Interface
• WSA — Wireless Security Auditor
• WIN — Wireless Intelligent Network
• SFX — Special Effects
• MMSI — Maritime Mobile Service Identity
• SCM — Single-Carrier Modulation
• LLA — Link Level Access
• WNMS — Wireless Network Management System
• TCC — Transmission Control Code
• SCR — System Change Request
• FMS — Fixed Mobile Substitution
• AT — Attenuation
• LIDB — Line Information DataBase
• BWX — Broadband Wireless Exchange
• PJC — Pointer Justification Count
• VOB — Versioned Object Base
• QS — Quasi-Synchronous
• LBR — Low Bit Rate
• ATSC — Advanced Television Systems Committee
• BIND — Berkeley Internet Name Domain

• B-CPE — Broadband Customer Premises Equipment
• BDE — Borland Database Engine
• NMC — Network Management Center
• CERN — Conseil Europeen Pour La Recherche Nucleaire
• LR-WPAN — Low-Rate Wireless Personal Area Network
• CGI — Computer Graphics Interface
• CES — Circuit Emulation Service
• TDR — Time-Domain Reflectometry
• B8ZS — Binary Eight Zero Substitution
• LSAP — Link Service Access Point
• APPC — Advanced Program-to Program Communications
• SCH — Synchronization Channel
• ENV — Environment
• PTT — Push to Talk Testing
• DAC — Digital to Analog Converter-Audio
• CBQ — Class-Based Queuing
• DNC — Do Not Call
• WAE — Wireless Application Environment
• FAT — Final Acceptance Testing
• NTU — Network Termination Unit
• VQV — Voice Quality Value
• PSLV — Polar Satellite Launch Vehicle (Indian Space Research Organization; India)
• TP — Transition Point
• FEM — Finite Element Method
• DFE — Design For Environment
• TNI — Telephone Network Interface
• SFN — Single Frequency Network
• LCAS — Link Capacity Adjustment Scheme
• NDIS — Network Driver Interface Specification (Microsoft Windows NT)
• ECS — Environmental Control System (Subsystem)
• CAMEL — Customized Applications for Mobile-network Enhanced Logic
• LP — Line Pair
• VLF — Vertical-Laminar-Flow
• 4WA — Four Wire Analog
• PTT — Push to Talk Taster
• DPNSS — Digital Private Network Signaling System
• MGCP — Multimedia Gateway Control Protocol
• EPP — Enhanced Parallel Port (PC)
• LN — Line
• OWS — Operator Work Station
• CDM — Configuration Data Manager
• CCA — Carrier-Controlled Approach
• ADPCM — Adaptive Differential Pulse Code Modulation
• WFG — Wireless Firewall Gateway
• NW — North West
• CDA — Communications Decency Act's
• TP — Termination Point
• GMSS — Global Mobile Satellite System
• MPU — Main Processor Unit
• DDLD — Direct Dial Long Distance

• DMS — Defense Messaging System
• IPRC — Intellectual Property Rights Committee
• RTC — Right to Carry
• UCF — Unregistration Confirm
• NSAP — Network Service Access Point
• EIR — Excess Information Rate
• FEAC — Far End Alarm and Control
• CEPT — Conférence Européenne des Administrations des Postes et des Télécommunications
• DOD — Dial on Demand
• BPSK — Binary Phase-shift Keying
• GSTN — General Switched Telephone Network
• SMS — System Management Server
• DECT — Digital Enhanced Cordless Telecommunication
• CSR — Customer Service Request
• ATU-C — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Central office end
• RADINT — Radar Intelligence
• CBMS — Computer-Based Message System
• CIS — Center for Integrated Systems
• PNP — Positive-Negative-Positive
• BP — Block Parity
• S/N — Signal-to-Noise ratio
• ECS — Encryption Control Signal
• CASE — Computer-Aided Software Engineering
• IBSS — Independent Basic Service Set
• PLE — Path Length Efficiency
• PY — person-year
• HDTV — High-Definition Television
• ADTM — Asynchronous Data Transfer Mode
• SPE — Synchronous Payload Envelope
• SMMR — Scanning Multichannel Microwave Radiometer
• COAM — Customer Owned And Maintained
• DXI — Data Exchange Interface
• TSDU — Transport Service Data Unit
• P2P — Person-to-Person
• CFOT — Certified Fiber-Optic Technician
• DDM — Data Distribution Manager
• AFPS — Automatic Facility Protection Switching
• MBE — Molecular Beam Epitaxy
• N-AMPS — Narrowband Advanced Mobile Phone System
• DEM — Digital Elevation Model
• DPST — Double-Pole Single-Throw
• IVP — Integrated Voice Protocol
• MTP — Message Transfer Part
• DDSN — Digital Derived Services Network
• RPCU — Radio Port Control Unit
• DL — Downlink Message
• NWK — Network
• BASIZE — Buffer Allocation Size
• TCM — Time Compression Multiplexer
• LORAN — Long Range Aid to Navigation System

• RAD — Recorded Announcement Device
• TCS — Telephony Control Specification
• BT — Back Trace
• PSK — Phase Shift Key
• DECCO — DISA Defense Commercial Communications Office
• ALI — Automatic Location Identifier
• GRX — GPRS Roaming Exchange
• IDCU — Integrated Digital Carrier Unit
• LXT — Local Exchange Terminal
• DNA — Do Not Answer
• DMT — Discrete Multi-tone Transmission
• X — X Window System
• CT — Cordless Telecommunications
• STM — Synchronous Transfer Mode
• RRC — Root Raised-Cosine
• ODS — Operational Data Store (knowledge management)
• SRA — Seamless Rate Adaptation
• WTNM — Working Telephone Number Management
• BHCA — Busy Hour Call Attempts
• UNI — User-Network Interface
• BAM — Basic Access Module
• MFLOPS — Millions of Floating Point Operations per Second
• SAMI — Structured Adjustment & Maintenance Interface
• UTL — Utility
• LSC — Link State Control
• M/W — MicroWave
• ANAC — An Automatic Number Announcement Circuit
• B-ISDN — Broadband ISDN
• SDNS — Secure Data Network System
• FTS — Federal Telecommunications System
• CDVT — Cell Delay Variation Tolerance
• LCGN — Logical Channel Group Number
• ATD — Advanced Technology Demonstration
• CDA — Communications Decency Act of 1996
• AMTI — Airborne Moving Target Indicator
• SA — Selective Availability (on GPS transmissions)
• CNID — Calling Number Identification Display
• TDM — Time Division Multiplexing
• TPS — Telephone Preference Service
• DCS — Defense Communications System
• BDFB — Battery Distribution Feeder Bay
• SMSC — Short Message Service Center
• UCM — Use Case Map
• WNAP — Wireless Network Access Point
• DSCS — Defense Satellite Communication System
• STM — Scanning Tunneling Microscopy
• FGDC — Federal Geographic Data Committee's
• AAL2 — ATM (Asynchronous Transmission Mode) Adaptation Layer 2
• RADARSAT — Radar Satellite
• AAP — Alternate Access Provider

• LEED — Low-energy Electron Diffraction
• NLM — NetWare Loadable Module
• CGI — Cell Global Identity
• CDV — Compressed Digital Video
• DNI — Data Network Interface
• QOI — Quality of Information
• ARD — Automatic Ring Down
• ARPT — Autorité de Régulation des Postes et Télécommunications
• EA — expedited acknowledgement
• IDLC — Integrated Digital Loop Carrier
• LMS — Location and Monitoring Service
• CCCI — Command, Control, Communications and Intelligence
• ACM — Address Complete Message
• CAAS — Communications-as-a-Service
• PTO — U.S. Patent And Trademark Office
• CSP — Converged Service Platform
• CCLC — Carrier Common Line Charge
• PCS — Personal Communications Services
• DDU — Digital Data Unit
• DCEF — Distributed Cisco Express Forwarding
• SCC — Specialized Common Carrier
• BB — Blackberry
• AI — Adapter Interface
• PHY — Physical Layer
• DMT — Digital-Discrete Multi-Tone
• MCR — Minimum Cell Rate (ATM)
• BNCC — Base Network Control Center
• RLS — Recursive Least Squares
• VSC — Vertical Service Code
• AAL — ATM (Asynchronous Transmission Mode) Adaptive Layer
• FOC — Fiber-Optic Cable
• SCORM — Shareable Content Object Reference Model
• CM — Connection Manager
• JISC — Japanese Industrial Standards Committee
• DS0 — Digital Signal Zero
• CLP — Cell Loss Priority (ATM)
• 100VG — 100 Voice Grade (IEEE 802.12 AnyLAN Standard)
• FFH — Fast Frequency Hopping
• SAR — Segmentation and Reassembly (ATM)
• WFA — Work Force Administration
• AAV — Alternate Access Vendor
• SQL — Specified Quality Level
• P&A — Privacy and Authentication
• LSF — Line Spread Function
• TLP — Transmission Level Point
• # — Number sign, octothorp; special function key
• QPM — QoS (Quality of Service) Policy Manager
• LSP — Label Switched Path
• FIFO — first-in, first-out
• TMSI — Temporary Mobile Subscriber Identity

• BT — Bluetooth Tablet
• MAG — Mobile Access Gateway
• BDSL — Broadband Digital Subscriber Line
• USRT — Universal Synchronous Receiver/Transmitter
• ATTRA — Appropriate Technology Transfer for Rural Areas
• BAOC — Barring of All Outgoing Calls supplementary service
• CCSA — Common Control Switching Arrangement
• CDSL — Consumer Digital Subscriber Line
• PSO — Professional Services Organization
• DMT — Discrete Multi-Tone
• AMOLED — Active Matrix Organic Light-Emitting Diode
• ATRAC — Adaptive Transform Acoustic Coding
• RDSS — Radio Determination Satellite Service
• IXC — interexchange carrier
• OSD — Onscreen Display
• VCA — Voice Connecting Arrangement
• SR — Slow Release
• ROW — Rest Of World
• HSCSWD — High-Speed Circuit-SWitched Data
• FR — Functional Requirement
• ECTF — Enterprise Computer Telephony Forum
• IPXCP — Internetwork Packet Exchange Control Protocol
• TRIG — Trigger
• ESA — Enhanced Subscriber Authentication
• GLT — Great Lakes Telecom
• TRX — Tandem Repeater eXchange
• SNIX — Single Noise Interference Xterminator
• MDN — Mobile Directory Number
• UMTS — Universal Mobile Telecommunication System
• NFR — Near-Field Recording
• IDCP — Internet Device Control Protocol
• CDDI — Copper Distributed Data Interface
• CSCW — Computer-Supported Cooperative Work
• SEM — Scanning Electron Microscopes
• MEID — Mobile Equipment Identifier
• GRUB — Greedy Reclamation of Unused Bandwidth
• LULT — Line Unit/Line Termination
• GFC — Generic Flow Control (ATM)
• VLR — Visitor Location Register
• STU — Secure Telephone Unit
• DLU — Digital Line Unit
• RM-ODP — Reference Model for Open Distributed Processing
• DUN — Dial-Up Networking
• VO — Voice Only
• A/D — Analog-to-Digital converter
• DBRNC — deciBel Relative to Noise in a Circuit
• CSAR — Combat Search and Rescue
• TC — Technical Committee (HL7)
• DACS — Digital Access and Cross-Connect System
• AB — Answer Back

• VADB — Virtual Auto Dial Backup
• SR — Scanning Radiometer
• BSS — Broadband Switching System
• PUC — Public Utility Commission (electricity)
• PT — Payload Type (ATM)
• CACM — Communications of the ACM
• MOS — Metal Oxide Semiconductor (FET Devices)
• SCE — Service Creation Environment
• AMTFT — Active Matrix Thin Film Transistor
• VCC — Voice Call Continuity
• AGCH — Access Grant Channel
• MEH — Mobile-Executed Handoff
• SINAD — SIgnal-to-(Noise And Distortion) ratio
• COBE — Corporate Owned Business Only
• NRZ — Nonreturn To Zero
• VOFR — Voice Over Frame Relay
• EST — Electroshock Therapy
• ADIF — Accounting Data Interchange Format
• DUV — Data-Under-Voice
• NEMP — Nuclear Electromagnetic Pulse
• TP — Transaction Processor
• BSRF — Basic System Reference Frequency
• AEA — American Electronics Association's
• * — Star, special function key
• ALCAP — Access Link Control Application Protocol
• CSDU — Core Service Data Unit
• OIM — Operations Interface Module
• DNU — Do Not Use
• LUNT — Line Unit Network Termination
• BHCC — Busy Hour Call Completions
• IBS — In-Building Solutions
• ATCA — Advanced Telecom Computing Architecture
• OOK — On/Off Keying
• VFL — Visual Fault Locator
• E2E — End-to-End
• DCC — Digital Control Channel
• PSQM — Perceptual Speech Quality Measure
• HPN — Home Phone Network
• BPP — Billed Party Preference
• PMOS — P-channel Metal Oxide Semiconductor
• MSI — Maritime Safety Information
• NAP — Network Access Point
• UIH — Unnumbered Information with Header check
• CAN — Controller Area Network
• EVC — Electronic Voucher Charging
• FLL — Fixed-Loss Loop
• LVM — Line Verification Module
• D3 — Digital channel bank, Third generation
• BTS — Base Transceiver Station (cellular)
• PMMA — Polymethyl Methacrylate

• 3GIP — Third Generation Internet Protocol
• KSPS — KiloSymbols Per Second
• DSU — Digital Service Unit
• KEK — Key Encrypting Key
• ETSI — European Telecommunications Standards Institute
• DPT — Dial Pulse Terminate
• PMT — Photo Multiplier Tube
• OCI — object code insertion
• CAS — Column Address Strobe
• DTR — Down-Time Ratio
• BTP — Business Telecom Products, Inc.
• WAW — Wide Area Wireless
• UTP — unshielded twisted pair
• NTSC — National Television Standards Committee
• TP-PMD — Twisted Pair Physical Medium Dependent
• Z — Zulu Time
• AECT — Association for Educational Communications and Technology's
• TSI — time-slot interchange
• FRF-LMI — Frame Relay Forum - Local Management Interface
• COP — Character Oriented Protocol
• ULP — Upper Layer Protocol
• CPT — Cellular Paging Teleservice
• DAF — Directory Access Function
• GTB — Global Telecom Brokers
• BUS — Broadcast and Unknown Server
• NICT — National Institute of Information and Communications Technology
• OLS — Optical Line System
• TASI — Time Assigned Speech Interpolation
• NCOS — Network Class Of Service
• DLT — Delete
• TOC — Telecommunication Operations Center
• MBS — Maximum Burst Size (ATM)
• WSP — Wireless Service Provider
• CCSS6 — Common Channel Signaling System # 6
• ZCZ — Zero Correlation Zone
• CVT — Circuit Validation Test
• CEE — Communaut? Economique Europ?enne
• NESC — National Electrical Safety Code
• NMS — NetWare Management System
• NPSI — Network Packet Switching Interface
• GOMP — Get Off My Phone
• FAW — Frame Alignment Word
• BORSCHT — Battery feed, Overvoltage protection, Ringing, Signaling, Coding, Hybrid, and Testing
• RCT — remote Control Terminal
• XWI — XML (extensible markup language) for Wireless Images
• IMPI — IP (Internet Protocol) Multimedia Private Identity
• LMDS — Local Multipoint Distribution Service
• ATB — Above-Ground Telecommunications Backbone
• DF — Direction Finding or Finder
• AEIMP — Apple Event Interprocess Messaging Protocol

• PM — Processable Mode
• VCR — Videocassette Recorder
• DTS — Digital Terminal Systems
• CMT — Commercial Metering Transponder
• GOS — Gerry Otis Simpson
• LAT — Local Area Transport (network)
• DLT — Digital Line Termination
• BABT — British Approvals Board for Telecommunications
• AFRINIC — African Network Information Centre
• MB — Measured Business
• RNR — Receive Not Ready
• WTL — Wireless Transport Layer
• BCIX — Berlin Commercial Internet Exchange
• 3GSM — Third-generation Global System for Mobile (communications)
• SPT — System Page Table
• USF — Universal Server Farm
• LSI — Large-Scale Integration
• ILETS — International Law Enforcement Telecommunications Seminar
• FIRST — Forum of Incident Response and Security Teams (CERT)
• CLOS — Clear Line Of Sight
• AIS-V — Alarm Indication Signal - Virtual
• JDC — Japan Digital Cellular
• FPLMTS — Future Public Land Mobile Telecommunications System
• STA — Science and Technology Agency (Japan)
• LSMS — Local Service Management System
• BIC — Bus Interface Controller
• TED — Triteal Enterprise Desktop
• NSN — National Significant Number
• AMP — amplifier / amplification
• ANT — ADSL Network Terminator
• AAS — Automatic Announcement Subsystem
• MTS — Message Transmission Subsystem
• JSC — Joint Scientific Committee (ICSU, WCRP, and WMO)
• E — Exchange
• HDB3 — High-Density Bipolar Three-bit substitution
• AFI — Authority and Format Identifier
• SDN — Software Defined Network
• ISC — International Switching Center
• WBMP — Wireless Bitmap
• SMU — Service Management Unit
• ISD — International Subscriber Dialling
• WFT — Wireline Formation Test
• MAU — Multistation Access Unit
• LMT — Lightwave Microcell Transceiver
• SS7 — Signaling System 7
• TSR — Terabit Switch/Router
• DLE — Digital Local Exchange
• ACU — Automatic Calling Unit
• LQC — Line Quality Control
• SPI — Security Parameters Index

• ECC — Emergency Communications Center
• SIGTRAN — Signaling Transport
• SVI — Service Interception
• CCR — Current Cell Rate (ATMF)
• TWX — Teletypewriter Exchange (Telex)
• VAD — Voice Activity Detection
• RBS — Robbed Bit Signaling
• DACS — Digital Access Carrier System
• CALS — Computer Aided Acquisition and Logistic Support
• BSC — Base Station Controller
• SIO — Service Information Octet
• MILNET — Military Network
• VGF — Voice Grade Facility
• ZD — Zero Defects
• PSN — Public Switched Network
• CD — Committee Draft
• MAC — Message Authenticity Check
• ANSI — Advanced Network Signaling Input
• BC — Basic Call
• SAPI — Service Access Point Identifier
• GOSIP — Government Open Systems Interconnection Profile
• QOD — Quality of Data
• LOP-P — Loss Of Pointer - Path
• TPC — The Phone Company
• EC — Equipment Controller
• TPF — Transmission Priority Field
• ETOM — Enhanced Telecom Operations Map
• ACMA — Atlantic Cable Maintenance Agreement
• SDSL — Symmetrical Digital Subscriber Line
• ALT — Automatic Link Transfer
• CCH — Common Channel Handler
• CCITT — Comite Consultatif International Telegraphique et Telephonique (now ITU-T)
• BRAN — Broadband Radio Access Network
• MDCP — Media Device Control Protocol
• BCSM — Basic Call State Model
• CS — Connection Segment
• C² — Command and Control
• TSGR — Transport System Generic Requirements
• WDSL — Wireless Digital Subscriber Line
• KTS — Key Telephone System
• PLCP — Physical Layer Convergence Protocol (ATM)
• DE — Discard Eligible
• ADM 3X — DS3 Add-Drop Multiplex
• NSE — Network Software Environment
• FEBE — Far End Block Error (SONET)
• AIS-L — Alarm Indication Signal - Line
• ETOC — Electronic Table of Contents
• ECDIS — Electronic Chart Display Information System
• CU — Cooling Unit
• LFTYR — Ley Federal de Telecomunicaciones y Radiodifusión

• TTC — Telemetry Telecommand and Control
• DOITT — Department of Information Technology and Telecommunications
• EC — Entropy Coding
• VPC — Virtual Path Connection (ATM)
• MEECN — Minimum Essential Emergency Communication Network
• SDHLR — Super-Distributed Home Location Register
• DTU — Date/Time Update
• MRT — Medical Response Team
• GSM — Global System for Mobile telecommunications
• DCO — Dial Central Office
• ACEK — Authentication Encryption Key
• BSVCI — Broadcast Signaling Virtual Channel Identifier
• IOC — Interoffice Channel
• F/W — Firmware
• RS-422 — Recommended Standard 422 (ANSI/EIA standard for transmitting serial data)
• MEAS — Measure
• MCPC — Multiple Channels Per Carrier
• CLASS — Cell Level ATM (Asynchronous Transfer Mode) Services Simulator
• OID — Object Interaction Diagram
• MP — Master Processor
• UDT — Unreliable Data Transfer
• ISSI — Inter-Switching System Interface
• PCIA — Personal Communications Industry Association
• ASAS — All-Source Analysis System
• TARP — Target Identifier Address Resolution Protocol
• DMI — Desktop Management Interface (computing)
• CCC — CDMA Cluster Controller
• EADAS — Engineering and Administrative Data Acquisition System
• CLI — Calling Line Identification
• STD — Secondary Telecom District
• LOB — Line Of Bearing/Balance
• RYP — Russian Yellow Pages
• MERIS — medium-resolution imaging spectrometer
• PTT — Post Telegraph and Telecommunications
• HU — Hook Up
• LCU — Lightweight Computer Unit
• FTNS — Fixed Telecommunications Network Services
• ISP — International Signaling Point
• BHP — Burst Header Packet
• ATMS — automatic transmission measuring system
• FEBE-I — Far End Block Error count - Interleaved data
• NTE — Network Terminating Equipment
• ARCNET — Attached Resource Computer Network
• MRCA — Most Recent Common Ancestor
• TACS — Total Access Cellular System
• V — Vector
• AIU — Analog Interface Unit
• ESM — electronic support measure
• CPN — Customer Premise Network
• UMTS — Universal Mobile Telecommunications Standard

• AQP — Association for Quality and Participation
• ZBTSI — Zero Byte Time Slot Interchange
• SASL — Simple Authentication and Security Layer
• ATU-R — ADSL (Asymmetric Digital Subscriber Line) Transceiver Unit - Remote terminal end
• WTP — Wireless Transaction Protocol
• RADSL — Rate Adaptive Digital Subscriber Line
• INAP — Intelligent Network Application Part
• SRS — Supported Residential Services
• HUMAN — High-speed Unlicensed Metropolitan Area Network
• FD — Full Duplex
• USPI — Universal Serial Phone Interface
• LDI — Long Distance Interconnect
• EC — Echo Cancelling
• LQR — Line Quality Report
• SR — Service Request
• AA — Auto-Answer
• ADTS — Ameritech Digital Transport Service
• CDPD — Cellular Digital Packet Data
• AIS-P — Alarm Indication Signal - Path
• WCMP — Wireless Control Message Protocol
• MO — Magneto-optic
• WUP — Wired Up Privacy
• BAN — Billing Account Number
• ATIS — Automatic Transmitter Identification System
• TAE — Terminal Adapter Equipment
• NARC — Non-Automatic Relay Center
• TD-CDMA — Time Division - Code Division Multiple Access
• IPOATM — Internet Protocol over ATM
• MAPDU — Management Application Protocol Data Unit
• CTTC — Centre Tecnològic de Telecomunicacions de Catalunya
• SMT — station management (protocol)
• RSN — Regional Service Network
• WPBX — Wireless Private Branch Exchange
• GOSIP — Government Open System Interconnection Profile
• CSP — Continuous Speech Processing
• DORA — EV-DO (EVolution-Data Optimized) standard Revision A
• SLIC — Subscriber Loop Interface Circuit
• GEO — Geostationary Earth Orbit
• SNI — Service Node Interface
• CQ — Communications Quality
• FOE — Fiber Optic Equipment
• WPKI — Wireless Public Key Infrastructure
• APR — Alarm Processing Remote
• JMA — Japanese Meteorological Agency
• TFL — Telecom Fiji Limited
• ITA — Illinois Telecommunications Association
• IPC — Initial Paging Channel
• SMDS — Switched Multi-megabit Data Service
• LTU — Line Termination Unit
• WAR — Wireless Access Revolution

• BHA — Busy Hour Attempts
• NIMH — Nickel-Metal Hydride
• IMTS — Improved Mobile Telephone Service
• AVT — Audio Visual Telecommunications
• DDS — Dataphone Digital Service (AT&T)
• MMC — Minimum Monthly Charge
• LEC — Liquid Encapsulated Czochralski
• RCF — Remote Call Forwarding
• NAM — Number Assignment Module
• BONDING — Bandwidth On Demand Interoperability Group
• ESG — Enhanced Service Gateway
• LRB — Loop Reverse Battery
• PTM — Packet Transport Mode
• DLC — Digital Leased Circuit
• LMS — Local Measured Service
• SLIP — Serial Line Internet Protocol
• RDI-L — Remote Defect Indicator - Loop
• DOV — Data-Over-Voice
• MMS — Multimedia Message Service
• NMC — Nortel Matra Cellular
• AH — Authentication Header
• FUD — Fair Use Doctrine
• PNE — Path Number Efficiency
• QPA — Quality Performance Analysis
• NSEP — National Security Emergency Preparedness
• CLF — Carrier Line Failure
• DOR — Detailed Outage Report
• TACSIM — Tactical Simulation (Simulator)
• FEBE-F — Far End Block Error count - Fast data
• JWG — Joint Working Groupof
• CPS — Customer Premises System (Bellcore)
• LZ — Lempel-Ziv compression algorithm
• TRANS — Transaction
• NMC — Network Model Coverage
• FOTS — Fiber Optical Transmission System
• RLC — Radio Link Control
• SDCCH — Standalone Dedicated Control Channel
• CALA — Customer Address Location Area
• ROSE — Remote Operations Service Element
• APS — Advanced Power System
• NICAD — Nickel Cadmium
• DORK — Disciples Of The Righteous King
• BFS — Broadcast File System
• FECC-F — Forward Error Correction Count - Fast data
• DCB — Digital Channel Bank (Sprint)
• CLIP — Caller Line Identification Presentation
• CSAA — Central Service Area Authority
• SAM — Service Access Multiplexer
• LRF — Laser Range Finder
• IR — Information Request

• PFE — Power Feed Equipment
• OC-1 — Optical Carrier Signal, Level 1
• VC — Virtual Circuit (ATM)
• TSD — Type Specific Driver
• SES — Scientific and Engineering Software
• RCMAC — Recent Change Memory Administration Center
• DSP — Data Service Provider
• GTP — GPRS (General Packet Radio Service) Tunneling Protocol
• VGC — Voice Grade Channel
• BIOS — Basic Input-Output System
• VAN — Value-Added Network
• BCS — British Computer Society
• RTFM — Read The Friendly Manual
• AEE — Agent Execution Environment
• EMV — EuroPay, MasterCard, Visa
• SSTC — Subsystem Status Test Control
• TSC — Technical Standards Committee
• SGSN — Serving GPRS (General Packet Radio Service) Support Node
• DCS — Digital Cross-connect Switch
• CSI — Clearing Subnetwork Identification
• FWS — Fixed Wireless Services
• CYTA — Cyprus Telecommunications Authority
• SGCP — Simple Gateway Control Protocol
• EC-N — Electrical Carrier (n=a number, e.g., EC-4)
• DCSS — Digital Cross-connect Systems
• ACNA — Access Customer Name Abbreviation
• DAS — Distributed Antenna System
• HTO — Hellenic Telecommunications Organisation
• MNP — Mobile Number Portability
• DMNG — Digital Mobile News Gathering
• CMOS — Cellular Management Operation System
• PTCL — Pakistan Telecommunication Company Ltd
• CFR-47 — Code of Federal Regulations Title 47 (FCC)
• CIPOA — Classical Internet Protocol over ATM (Asynchronous Transfer Mode)
• DCA — Distributed Communications Architecture
• NAU — Network Addressable Unit
• SS6 — Signalling System 6
• MQFP — Metric Quad Flat Pack
• APS — American Protective Services
• SM OFC — Single-Mode Optical Fiber Cable
• CEPT — Conference of European Posts and Telecommunications
• PTM — Point-To-Multipoint
• UMTS — Universal Mobile Telecommunication Services
• AL — Alignment
• ML-PPP — Multilink Point-to-Point Protocol
• ATR — Advanced Telecommunications Research Institute
• WIS — WAN (Wide Area Network) Interface Sublayer
• ACA — Automatic Circuit Assurance
• WAWS — Washington Area Wideband System
• GTXC — Global Telephone Exchange Carrier

• WLNP — Wireless Local Number Portability
• QEDI — Quod Erat Demonstrandum
• DTW — Dynamic Time Warping
• IOS — Internet Over Satellite
• CSTA — Computer Supported Telecommunications Applications
• TOMS — Telecom Operations Management System
• TEM — Transmission Electron Microscope
• ICLD — Inter-Channel Level Difference
• CTIT — College of Telecommunications and Information Technology
• TCL — Transverse Conversion Loss
• ESP — Essential Service Protection
• OST — Office of Science and Technology
• DACS — Digital Access Cross-Connect Switch
• BSSMAP — Base Station System Management Application Part
• PRM — Performance Report Message
• DRTL — Dial Repeating Tie Line
• RCQS — Roaming Call Quality Sensor
• MNOS — Metal-nitride-oxide Semiconductor
• DBF — Digital Beam-Forming
• IDEN — Integrated Dispatch Enhanced Network
• ASC — Available Spare Capacity
• PNM — Pulse Number Modulation
• OODBMS — Object-Oriented Database Management Systems
• 4G — Fourth Generation
• ICTA — Idaho Cable Telecommunications Association
• MBMS — Multimedia Broadcast/Multicast Service
• DS-1 — Digital Signal, Level 1
• SMDR — station message detail recording
• ASP — Active Signaling Protocol
• MRVT — MTP Routing Verification Test
• DECT — Digital Enhance Cordless Telecommunications
• LCU — Line Control Unit
• AARQ — A-Associate Request
• DRTT — Dial Repeating Tie Trunk
• IRLAP — InfraRed Link Access Protocol
• AFIPS — American Federation of Information Processing Societies
• NSDI — National Spatial Data Infrastructure
• AS — Active Service
• PROV — Provisioning
• SMG — Super Master Group
• AUSPI — Association of Unified Telecom Service Providers of India
• RANAP — Radio Access Network Application Part
• FESS — Flywheel Energy Storage System
• EEHO — Either End Hop Off
• HQGSM — High-Quality Global System for Mobile communications
• M2M — Multipoint-to-Multipoint
• ADTS — Automated Digital Terminal System
• LSAP — Link Layer Service Access Point
• RTU — Right to Use
• ACRE — Authorization and Call Routing Equipment

• RAI — remote alarm indication
• DFRI — Datacom Reference Frame Input
• MED — Manipulative Electronic Deception
• ATL — Advanced Technology Laboratory
• RFI — Remote File Inquiry
• RCR — Research and Development Center for Radio Systems
• MSG — Management Steering Group
• DISA — Direct Inward Switch Access
• CM — Common Mode
• EF&I — Engineering, Furnishing and Installation
• EDT — European Deaf Telephone
• BANC — Broadband Access Network Coordination
• COI — Community of Interest
• DDSD — Delay Dial Start Dial
• ICI — Interexchange Carrier Interface
• YIP — Your Internet Phone
• CMAS — Cellular Management System
• NECA — National Exchange Carrier Association
• SAI — Serving Area Interface
• TWL — Leased Teletypewriter Service
• DPDCH — Dedicated Physical Data Channel
• PSC — Picture Start Code
• VHM — Voice Health Monitor
• EDGE — Enhanced Data for GSM (Global System for Mobile communication) Evolution
• IPR — Intellectual Property Right
• EGPRS — Enhanced General Packet Radio Service
• MVDS — Microwave Video Distribution System
• TON — IEEE/ACM Transactions On Networking
• VCT — Variable Cam Timing
• WDMW — Web Directory for Mobile and Wireless
• SCO — Synchronous Connection Oriented
• WAPI — Wireless LAN Authentication and Privacy Infrastructure
• IPTD — Internet Protocol Telephony Design
• MIN — Mobile Identification Number
• UPS — Un-interruptable Power Supply
• INWATS — INward Wide Area Telecommunications Service
• CAE — Common Application Environment
• IRAC — Interdepartment Radio Advisory Committee
• 800 — Freephone
• WGX — Wireless Gateway Switch
• CAIRO — Communications Audio Interface for Remote Operations
• CNE — Certified Novell Engineer
• DCMES — Dublin Core Metadata Element Set
• CAL — Customer Access Line
• UVG — Universal Voice Grade
• E-TDMA — Expanded Time Division Multiple Access
• UTP — Universal Transmission Protocol
• DTAU — Digital Test Access Unit
• UPC — Usage Parameter Control
• RSL — Request and Status Links

• CF — Coin First Payphone
• FRAD — Frame Relay Assembler/Disassembler
• DFT — Draft Tax Forms
• PTI — Payload Type Indicator
• ANS — Advanced Network Services
• ADM — Administration, Office of
• WPOP — Wireless Point-of-Presence
• IS 41 — Interim Standard 41 (Inter-Cellular Network Communication Protocol)
• IPCU — iPhone Configuration Utility
• CONS — Connection-oriented Network Services
• CSL — component sublayer
• TLC — Television the Learning Channel
• CDR — Common Data Rate
• RBT — Ring Back Tone
• HEC — Header Error Control
• WRED — Weighted Random Early Detection
• DEO — Digital End Office
• DBN — Dial-Back Number
• CT — Control terminal
• MOC — Maintenance and Operations Console
• CD ROM — Compact Disc Read-Only Memory
• CL — cell loss
• ACL — Asynchronous Connection-less Link
• EKTS — Electronic Key Telephone Set
• WDF — Wireless Data Forum
• CW — Call Waiting Supplementary Service
• RSI — Record Status Indicator
• FHSS — Frequency Hopping Spread Spectrum
• TRAI — Telecom Regulatory Authority of India
• BTO — Betts Telecom Oklahoma
• FELB — Far-End Loop Back
• PAGCH — Paging and Access Grant Channel
• SINS — Ship’s Inertial Navigation System
• SACS — Security Access Control System
• TAPI — Telephony Application Programming Interface
• VTIR — visible and thermal infrared radiometer
• SMAS — Service Management System
• BPOP — Building Point of Presence
• FCFS — First-Come, First-Served
• CUSA — Central Urban Service Area
• DMB — Disconnect and Make Busy
• CFNA — Call Forwarding No Answer
• NAM — Numeric Assignment Module
• WDRM — Wireless Design Reference Manual
• UDC — Universal Digital Channel
• STE — Syrian Telecommunications Establishment
• CATI — Computer-Assisted Telephone Interviewing
• XRF — X-Ray Fluorescence
• RLC — Reverse Link Channel
• SGS — Software Generation System

• ADC — Advanced Data Control
• MOD — Modulo
• GSM-R — Global System for Mobile (communications) – Rail
• MC-SS — Multi-Carrier Spread Spectrum
• HPPI — High-Performance Parallel Interface
• UR — User Rate
• DTU — Data Terminal Unit
• SLC — Service Level Contract
• UTRAN — UMTS (Universal Mobile Telecommunication System) Terrestrial Radio Access Network
• DLCS — Digital Loop Carrier System
• ELEC — Enterprise Local Exchange Carrier
• SHR — Self-Healing Ring
• PMD — Physical Media-Dependent
• FR-SSCS — Frame Relay Service Specific Convergence Sub-Layer