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Computing & IT >> Telecom Abbreviations

Look through 4999 acronyms and abbreviations related to Telecom:

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

• DFD — Displaced Frame Difference
• EAP — Employee Assistance Program
• CPE — Customer Premises Equipment
• FAR — Federal Aviation Regulation
• ISO — International Organization for Standardization
• SYN — Synchronous
• BUR — Bandwidth Usage Redundancy
• AFAIK — As Far As I Know
• LRJ — Location Reject
• PDR — Preliminary Design Review
• D-H — Diffie-Hellman
• VM — Voice Mail
• LASER — Light Amplification By Stimulated Emission Of Radiation (cf. Maser)
• AATSR — Advanced Along-Track Scanning Radiometer
• EDI — Electronic Data Interchange
• STS — Space Transportation System
• CD — Compact Disc
• OIC — Oh I See
• WTG — Way To Go
• ACE — Access Control Entry
• NFS — Network File System
• ACC — Adaptive Cruise Control
• RPI — Retail Price Index
• CCSDS — Consultative/Consultative Committee for Space Data Systems
• CY — Calendar Year
• FET — Field Effect Transistor
• MB — Megabyte
• IRL — In Real Life
• EIS — Executive Information System
• AUP — Acceptable Use Policy
• ANSI — American National Standards Institute, Inc.
• CV — Curriculum Vitae
• Y2K — Year 2000
• ATTN — Attention
• MMS — Multimedia Messaging Service
• CPU — Central Processing Unit
• ACH — Automated Clearing House
• ABI — Application Binary Interface
• RWR — Radar Warning Receiver
• CS — Computer Science
• IRR — Internal Rate of Return
• ALC — Automatic Level Control
• CBCU — Centralized Broadband Control Unit
• DAC — Discretionary Access Control
• FEMA — Federal Emergency Management Agency
• APT — Automatic Picture Transmission
• PDH — Plesiochronous Digital Hierarchy
• ADD — Addendum
• AC — Alternating Current
• SDMA — Space Division Multiple Access

• DSA — Digital Signature Algorithm
• ISP — Internet Service Provider
• ATM — Automatic Teller Machine
• EFF — Electronic Frontier Foundation
• EW — Electronic Warfare
• DDL — Data Definition Language
• AES — Auger Electron Spectroscopy
• BTW — By The Way
• AAC — Advanced Audio Coding
• CCB — Change Control Board
• AES — Advanced Encryption Standard
• ADM — Add/Drop Multiplexer
• PDA — Personal Digital Assistant
• GSM — Global System for Mobile Communications
• GPRS — General Packet Radio Service
• DAM — Diagnostic Acceptability Measure
• QI — Quality Improvement
• ASA — American Standards Association
• HTTP — Hypertext Transfer Protocol
• CEO — Chief Executive Officer
• OEM — Original Equipment Manufacturer (usually in reference to car parts)
• LCD — Liquid Crystal Display
• SP — Service Provider
• COB — close of business (End of duty day)
• SAN — Storage Area Network
• ACFQ — Absence Compensation Fair Queuing
• ADR — Address
• WWW3 — World Wide Web Consortium
• SCSI — Small Computer System Interface
• WAN — Wide Area Network
• DFS — Distributed File System
• DME — Distance Measuring Equipment
• TQM — Total Quality Management
• ABR — Available Bit Rate
• NIC — Network Interface Card
• ACD — Automatic Call Distributor
• CU — Control Unit
• RNC — Radio Network Controller
• AC — Access Control
• SMTP — Simple Mail Transfer Protocol
• ATA — Area Transportation Authority
• CGI — Common Gateway Interface
• WDM — Wavelength Division Multiplexing (fiber optics)
• CDR — Call-Detail Record
• BPM — Beats Per Minute
• NOS — Network Operating System
• EOM — End Of Message
• AVHRR — Advanced Very High Resolution Radiometer  
• NPI — New Product Introduction
• R&D — Research & Development

• CBC — cipher block chaining
• RF — Radio Frequency
• VR — Virtual Reality
• ASR — Airport Surveillance Radar
• LRU — Line Replaceable Unit
• AP — Application Protocol
• WWW — World Weather Watch
• RU — Are You?
• LLC — Limited Liability Company
• SCC — Standards Council of Canada
• ATF — Advanced Tactical Fighter
• S X S — Step-by-Step
• VAT — Value Added Tax
• BS — Base Station
• GIS — Geographic Information System
• QFSK — Quadrature Frequency Shift Keying
• C4I — Command, Control, Communications, Computers, & Intelligence
• RPC — Remote Procedure Call
• JAXA — Japan Aerospace Exploration Agency
• IP — Internet Protocol
• TC — Telephone Call
• ASME — American Society of Mechanical Engineers
• TCB — Trusted Computing Base
• RFP — Request For Proposal
• IM — Instant Message
• POC — Point Of Contact
• WEP — Wired Equivalent Privacy
• MOU — Memorandum of Understanding (an MOU between Food & Drug Administratin and a regulatory agency in another country allows mutual recognition of inspections)
• CIM — Corporate Information Management
• SD — Standard Deviation
• MST — Mountain Standard Time
• APIC — Advanced Programmable Interrupt Controller
• DB — Decibel
• RFC — Request For Comment
• ATM — Adobe Type Manager
• SIG — Special Interest Group
• FAA — Federal Aviation Administration
• CB — Call Back
• TCP — Transmission Control Protocol
• RM — Resource Management
• ISRO — Indian Space Research Organisation
• BBS — Bulletin Board Service
• MRI — Magnetic Resonance Imaging
• AIS — Automated Information System
• ISO — Infrared Space Observatory
• CIO — Chief Information Officer
• DIT — Directory Information Tree
• FX — Foreign Exchange
• IMPACT — Integrated Manufacturing Precision Assembly Cellular Technology
• ME — Mobile Equipment

• CC — Call Control
• TAC — Technical Assistance Center
• GRE — Generic Routing Encapsulation
• CR — Carriage Return
• MS — Message Store
• PDT — Pacific Daylight Time
• NIH — Not Invented Here
• LCP — Link Control Protocol
• CPT — Carriage Paid To
• Q&A — Question & Answer
• MSN — Microsoft Network
• UAV — Unmanned Aerial Vehicle
• DSCP — Differentiated Services Control Point
• ATM — Asynchronous Transfer Mode
• FCW — Federal Computer Week
• AD — Active Directory
• CFE — Contractor-Furnished Equipment
• TM — Technical Manual
• UAS — Unavailable Seconds
• I/O — Input/Output
• SQA — Software Quality Assurance
• TV — Television
• MIC — Message Integrity Check
• EC — European Commission
• SLA — Service Level Agreement
• MOS — Model Output Statistics
• NATO — North Atlantic Treaty Organisation
• YP — Yellow Pages
• MS — Mobile Station
• DSA — Directory System Agent
• BTU — British Thermal Unit
• COR — Carrier Operated Relay
• DT — DWDM (Dense Wavelength Division Multiplexing) Terminal
• VVX — Voice and Video eXchange
• PAR — Precision Approach Radar
• UDP — User Datagram Protocol (FDDI related)
• PLD — Programmable Logic Device
• AT — Access Tandem
• TS — Technical Specification
• 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.
• CDS — Cell Directory Service
• MPI — Message Passing Interface
• SLIP — Serial Line Interface Protocol
• COMJAM — Communications Jamming
• PAL — Programmable Array Logic
• FC — Fibre Channel
• RCU — Remote Control Unit
• PLMN — Public Land Mobile Network
• LLC — Logical Link Control
• ABC — activity based costing

• DTE — Data Terminal Equipment
• AF — Audio Frequency
• S-BCCH — Short Message Service Broadcast Control Channel
• IPO — Initial Public Offering
• LED — Light-Emitting Diode
• CIS — Commonwealth of Independent States
• IS — Intermediate System
• TBD — To Be Decided
• CAE — Computer-Aided Engineering
• OSS — Operational Support System
• EGA — Enhanced Graphics Adapter
• DMSP — Defense Meteorological Satellite Program (U.S.)
• ARPA — Advanced Research Projects Agency (made early internet)
• JV — Joint Venture
• SMS — Short Message Service
• DLC — Digital Loop Carrier
• M — Meter
• QOS — Quality of Service
• CMI — Computer Managed Instruction
• DES — Data Encryption Standard
• IW — Information Warfare
• VM — Virtual Machine
• CCIS — Common Channel Interoffice Signaling
• ATS — applications technology satellite
• SEM — Space Environment Monitor
• CC — Carbon Copy
• SEC — Software Engineering Center
• CM — Configuration Management
• VDS — Variable Depth Sonar
• F — Fellow
• BECN — Backward Explicit Congestion Notification
• LCN — Logical Channel Number
• SDR — Special Drawing Rights
• WB — Welcome Back
• QMS — Quality Management System
• MAC — Message Authentication Code
• CPM — Critical Path Method
• JIS — Japanese Industrial Standard
• THX — Thanks
• BPRZ — Bipolar Return-to-Zero
• VOP — Voice Over Packet
• BCC — Blind Carbon Copy
• LSR — Local Service Request
• AM — Amplitude Modulation
• DHCP — Dynamic Host Configuration Protocol
• TNSTAAFL — There's No Such Thing As A Free Lunch
• DIS — Distributed Interactive Simulation
• SGML — Standard Generalized Markup Language
• TPDU — Transport Protocol Data Unit
• PUHU — Pick Up Hang Up

• Z — Zero
• PDF — Portable Document Format (created by Adobe Acrobat)
• HW — Hardware
• 100BASE-T2 — 100 Megabits per Second, Baseband, Two-pair Category 3 UTP cables
• CAM — Computer-Aided Mapping
• UAN — Universal Access Number
• EAP — Extensible Authentication Protocol
• DTX — Discontinuous Transmission
• EBCDIC — Extended Binary Coded Decimal Interchange Code (pronounced Eb-see-dik) (cf. BCD)
• RCC — Rescue Coordination Center
• USB — Universal Serial Bus
• UHF — Ultra High Frequency (300-3000 MHz; 1m-10cm)
• SSM — Source-Specific Multicast
• NI — Network Interface
• SA — Scientific American
• CRL — Certificate Revocation List
• MDA — Monochrome Display Adapter
• NMT — Nordic Mobile Telephone
• DS — Digital Signal
• CAC — Carrier Access Code
• MHS — Microwave Humidity Sounder
• DPC — Destination Point Code
• CABS — Carrier Access Billing System
• SME — Subject Matter Expert
• FFT — Fast Fourier Transform
• EDS — Electronic Data Systems Corporation
• WBS — Work Breakdown Structure
• ICT — Information and Communication Technology
• MS — Management System
• EAS — Extended Area Service
• MF — Medium Frequency
• AM — Ante Meridian
• A-KEY — Authentication key
• ISS — International Space Station
• PO — Purchase Order
• ATC — Air traffic control
• SCP — Service Control Point
• TEC — Total Electron Content
• FXO — Foreign Exchange Office
• E — Energy
• AR — Access Rate
• DOA — dead on arrival
• ECN — Explicit Congestion Notification
• ICMP — Internet Control Message Protocol
• NMSE — Normalized Mean Square Error
• ASR — Access Service Request
• MC — Message Center
• HDLC — High-Level Data Link Control
• RT — Remote Terminal
• MP — Multilink Protocol

• IP — Intelligent Peripheral
• PE — Polyethylene
• ACL — Access Control List
• ZIP — Zone Information Protocol
• AGP — Accelerated Graphics Port
• ATSR — Along-Track Scanning Radiometer
• ARPANET — ARPA Network
• SM — Senior Member
• WPS — Wireless Priority Service
• DLR — Design Layout Record
• B-ICI — Broadband Inter-Carrier Interface
• WS — Workstation
• X-BAR — Crossbar telephone exchange
• CS — Cable Select
• VB — Visual Basic
• AFP — AppleTalk Filing Protocol
• CO — Certificate of Origin
• GPS — Global Positioning System (ex-NAVSTAR)
• DC — Direct Current
• RFS — Request For Service
• MD — Mediation Device
• CERT — Computer Emergency Response Team
• ATCRBS — Air Traffic Control Radar Beacon System
• AE — Application Entity
• EST — Eastern Standard Time
• RAD — Rapid Application Development
• AOA — Angle Of Arrival
• JSC — Johnson Space Center (Houston, TX)
• OMG — Object Management Group
• BACP — Bandwidth Allocation Control Protocol
• LEO — Low Earth Orbit (satellite communications)
• MTBF — Mean Time Before Failure
• EVP — Executive Vice President
• AGC — Automatic Gain Control
• VHF — Very High Frequency
• ADPE — Automatic Data Processing Equipment
• PNG — Portable Network Graphics (graphic file standard/extension)
• ASK — amplitude shift keying
• VOD — Video On Demand
• SAS — Statistical Analysis System
• PM — Preventive Maintenance
• NYSE — New York Stock Exchange
• SPI — Service Provider Interface
• CCM — counter-countermeasure
• OTN — Optical Transport Network
• ADF — Automatic Direction Finder
• RTS — Request To Send
• PCB — printed circuit board
• API — Application Programming Interface
• MSE — Mobile Subscriber Equipment

• AME — Amplitude Modulation Equivalent
• IPX — Internetwork Packet Exchange
• TLS — Transport Layer Security
• UA — User Agent
• LF — Low Frequency
• BRA — Basic Rate Access
• WB — Write Back
• ASCII — American National Standard Code for Information Interchange
• AT — Advanced Technology
• SDD — Software Design Document
• CIM — Common Information Model
• NSA — National Security Agency
• SEI — Software Engineering Institute
• MSU — Microwave Sounding Unit
• PVT — Private
• BSD — Berkeley Software Distribution
• TN — Telephone Number
• NOTAM — Notice to Airmen
• FA — Functional Area
• BT — British Telecommunications
• DCP — Design Change Package
• X-ON — Transmitter On
• ADT — Abstract Data Type
• MS — Millisecond
• DNS — Domain Name System
• UR — Your
• RIP — Routing Information Protocol
• AMT — Amount
• SVC — Switched Virtual Connection
• ARPU — Average Revenue Per User
• DOM — Document Object Model
• EPA — Environmental Protection Agency (US)
• CW — Continuous Wave
• RCV — Receive
• ACM — Association for Computing Machinery
• CT — Computer Telephony
• CA — Certificate Authority
• PPM — parts per million
• OBO — Or Best Offer
• BT — BlueTooth
• RFI — Radio Frequency Interference
• SAN — System Area Network
• CGI — Computer-Generated Imagery
• M — Management
• VLL — Virtual Leased Line
• NSF — National Sanitation Foundation
• DA — Destination Address
• STK — Satellite Tool Kit
• PWD — Password
• APC — American Power Conversion

• SBC — Session Border Controller
• STP — Spanning Tree Protocol
• AU — Audio Unit
• CATV — Community Antenna Television
• OM — Old Man
• SCTP — Stream Control Transmission Protocol
• IETF — Internet Engineering Task Force
• SCN — Switched Circuit Network
• IS — International Standard
• HF — High Frequency
• Y — Yes
• OPC — Originating Point Code
• ABET — Accreditation Board for Engineering and Technology, Inc.
• TB — Terabyte
• AML — Amplitude Modulated Link
• ZIP — Zone Improvement Plan
• AM — Activity Manager
• BRB — Be right back
• PT — Project Team
• TRM — Technical Reference Model
• TNYWR — The Number You Will Receive
• GUI — Graphical User Interface (goo-ey)
• CAN — Campus Area Network
• ASTM — American Society for Testing and Materials (Philadelphia, Pennsylvania)
• ECT — Explicit Call Transfer
• TBD — To Be Determined
• IN — Intelligent Network
• P&L — Profit and Loss statement
• FR — Frame Relay
• BCD — Binary-Coded Decimal
• X-OFF — Transmitter Off
• URI — Uniform Resource Identifier
• NIC — Network Information Center
• NESDIS — National Environmental Satellite, Data, and Information Service
• DCE — Distributed Computing Environment
• MSR — Microwave Scanning Radiometer
• PCI — Peripheral Component Interconnect
• ARC — Army Reuse Center
• COM — Component Object Model
• ERT — Emergency Response Team
• RACON — Radar Beacon
• ACK — ACKnowledgment
• FE — Far End
• AS — Autonomous System
• NIS — Network Information Service
• LZ — Landing Zone
• CSMA/CD — Carrier Sense Multiple Access with Collision Detection
• NTFS — New Technology File System
• BBS — Bulletin Board System
• CUL — See You Later

• ADSL — Asymmetric Digital Subscriber Line
• MDA — Model Driven Architecture
• FCA — Free Carrier
• AMI — Advanced Metering Infrastructure
• SVC — Scalable Video Coding
• DID — Digital Information Display
• MCU — Multipoint Control Unit
• CIA — Central Intelligence Agency
• TTYL — Talk To You Later (Internet Slang)
• MOL — Manned Orbiting Laboratory
• NMS — Network Management System
• PRF — Pulse Repetition Frequency
• EAC — Engineering Accreditation Commission
• CNM — Customer Network Management
• CIC — Circuit Identification Code
• ADEOS — ADvanced Earth Observing Satellite (Japan)
• MOD — Modify
• CAB — Conformity Assessment Body
• ISA — Industry Standard Architecture
• WG — Working Group
• VIRUS — Vital Information Resources Under Siege
• B3ZS — bipolar 3-zero substitution
• ES — Errored Second
• VAC — Vacant
• TOP — Technical Office Protocol
• NCS — National Communications System
• RFO — Reason For Outage
• CSAT — Customer Satisfaction
• GDS — Global Distribution System
• NEC — National Electrical Code
• DX — Duplex
• UL — Uplink
• Y — Yttrium
• BS — Beam Splitter
• H323 — ANSI standard for format over IP
• RDBMS — Relational Database Management System
• TE — Traffic Engineering
• AE — Account Executive
• DUP — Duplicate
• SIL — Speech Interference Level
• TCP/IP — transmission control protocol/internet protocol
• WACN ID — Wide Area Communications Network IDentifier
• IVR — Interactive Voice Response (telephone technology)
• RH — Relative Humidity
• OAS — Organization of American States
• HSD — High Speed Data
• MOB — Mobile
• HSDPA — High-Speed Downlink Packet Access
• ACE — Advanced Computing Environment
• SVD — Singular Value Decomposition

• WMAN — Wireless Metropolitan Area Network
• ARG — Argument
• AFS — Andrew File System
• TOS — Type Of Service
• C-NBAP — Common Node B Application Part
• AEW — Airborne Early Warning
• TSR — Telecommunications Service Request
• SAS — Special Access Surcharge
• LD — Long Distance
• ISI — Inter-Symbol Interference
• PDN — Public Data Network
• SRAM — Static Random Access Memory (ess-ram)
• ECAC — European Civil Aviation Conference
• USD — United States Dollar
• NNM — Network Node Manager
• VT — Vacuum Tube
• BRDF — Bidirectional Reflectance Distribution Function
• TWT — Traveling Wave Tube
• SWAG — Scientific Wild Ass Guess
• MRC — Monthly Recurring Charge
• RA — Risk Analysis
• TLC — The Learning Channel
• MLS — Multiple Listing Service
• COO — Cost of Ownership
• OMS — Optical Multiplex Section
• ZDBOP — Ziff-Davis Benchmark Operation
• STM — Short Term Memory
• CLNP — ConnectionLess-mode Network Protocol
• FUP — Fair Use Policy
• RM — Regional Manager
• XA-FR — Exchange Access Frame Relay
• METRO — Metropolitan
• DC — Display Controller
• CG — Coast Guard
• DAP — Directory Access Protocol
• PS — Product Specification
• ASR — Automatic Speech Recognition
• UPS — Ultraviolet Photoelectron Spectroscopy
• EU — European Union (1994; formerly referred to as the EEC or EC)
• NA — Not Applicable
• FITS — Flexible Image Transport System
• VOL — Volume
• UAX 14 — Unit Automatic eXchange type 14
• PDS — Protected Distribution System
• LEN — Line Equipment Number
• ACK — Acknowledge (telecommunications; Cf. NAK)
• CF — Compact Flash
• RT — Response Time
• AIR — Account Information and Refill
• COQ — Cost Of Quality

• TI — Time Interval
• GATT — General Agreement on Tariffs and Trade (government)
• TG — Task Group
• PAN — Personal Area Network
• PDS — Planetary Data System
• IIS — Internet Information Services
• DEC — Decimal
• PECVD — Plasma-Enhanced Chemical Vapor Deposition
• P — Predicted
• SPC — Stored Program Control
• OC — Optical Carrier
• FDL — Facility Data Link
• YGWYPF — You Get What You Pay For
• LF — Line Feed
• DC — Disconnected
• LP — Low Pressure
• EMG — Electromyogram
• PE — Probable Error
• DSC — Differential Scanning Calorimetry
• PMA — Physical Medium Attachment
• CBDS — Connectionless Broadband Data Service
• IDT — Integrated Digital Terminal
• FE — Finite Element
• PGA — Programmable Gate Array
• CB — Common Battery
• PD — Public Domain
• AOI — Area Of Interest
• BIS — Bureau of Indian Standards
• DL — Digital Library
• NPV — Net Present Value {economics}
• SF — Single Frequency
• A — Anode
• CBT — Computer Based Training
• ACT — Activity
• PTA — Pakistan Telecommunication Authority
• W3C — World Wide Web Consortium
• IS — Information System
• Q — Quadrature
• MCD — Magnetic Circular Dichroism
• EX — Exercise
• LPC — Linear Predictive Coding
• DTR — Data Terminal Ready
• BG — Background
• CEV — Controlled Environment Vault
• APM — Advanced Power Management
• DAL — Dedicated Access Line
• EEC — European Economic Community (predecessor of the European Union|EU)
• TE — Test Equipment
• MCSD — Microsoft Certified Solution Developer
• LU — Logical Unit

• LEP — Large Electron Positron
• DCN — Disconnect
• AIN — Advanced Intelligent Network
• DVP — Digital Voice Privacy
• FCP — Fibre Channel Protocol
• ATA — Analog Telephone Adapter
• SD — Software Development
• RDY — Ready
• ESS — Electronic Switching System
• CER — Cell Error Ratio
• DDS — Digital Data Service
• ETS — European Telecommunication Standard
• BBU — Baseband Unit
• PPB — parts per billion (109)
• AS — Access System
• E — Echo
• EPR — Electron Paramagnetic Resonance
• UP — User Profile
• NAS — Network Access Server
• ROSAT — Roentgen Satellite
• QA — Center for Quality Assurance in International Education
• ASQC — American Society for Quality Control's
• SML — Service Management Layer
• MVS — Multiple Virtual Storage
• AIS — Alarm Indication Signal
• OSPF — Open Shortest Path First (ATM)
• RDP — Radar Data Processing
• CTS — Clear To Send
• ACE — Adaptive Communication Environment
• NA — Network Adapter
• CRT — Cathode Ray Tube (type of TV)
• VC — Virtual Channel
• AFC — Automatic Frequency Control
• CU — See You
• BOC — Bell Operating Company
• CATV — Cable Television
• CDC — Connected Device Configuration
• JPL — Jet Propulsion Laboratory (California Institute of Technology) (NASA)
• FAA — Federal Aviation Agency
• ECP — Encryption Control Protocol
• EIP — Equipment installation procedure
• PG — Page
• SHF — Super High Frequency
• DCS — Digital Cellular System
• TSB — Telecommunication Standardization Bureau
• LT — Less Than
• BST — British Summer Time
• SA — Source Address
• E-LEAD — Ear Lead
• ARP — Address Resolution Protocol (ATM)

• CO — Central Office
• CCTV — Closed-circuit television
• BIP — Band Interleaved by Pixel
• RSRQ — Reference Signal Received Quality
• VOA — Voice Of America
• BSS — Basic Service Set
• SAR — Specific Absorption Rate
• ACR — Attenuation Crosstalk Ratio
• DMARC — Demarcation point
• FDDI — Fiber Distributed Data Interface
• IV — Initialization Vector
• 9 — Nine
• D-NBAP — Dedicated Node B Application Part
• TE — Terminal Equipment
• CSMA — Carrier Sense Multiple Access
• PGP — Pretty Good Privacy (encryption)
• MCA — Micro Channel Architecture
• AMI — Alternate Mark Inversion
• SBC — Southwestern Bell Corporation
• DQE — Detective Quantum Efficiency
• BS — Broadcast Satellite
• BS — Backing Store
• RT — Radiotelephone
• BBM — Blackberry Messenger
• BERT — Bit Error Rate Tester (telecommunication)
• PIC — Peripheral Interface Controller
• AUD — Audit
• BER — Bit-Error Rate
• AT&T — American Telephone & Telegraph
• OCR — Optical Character Recognition
• C — Cost
• RAM — random-access memory
• DOD — United States Department of Defense
• CIR — Committed Information Rate (Frame Relay)
• ADL — Advanced Distributed Learning
• IT — Integration Test
• OTS — Optical Transmission Section
• ATN — Aeronautical Telecommunication Network
• SIM — Subscriber Identity Module
• TMS — Time Management System
• MIS — Management Information System (OSHA)
• CU — Channel Unit
• ADC — Analog-Digital Converter
• TCR — Temperature Coefficient of Resistance
• BYOD — Bring Your Own Device
• ISDN — Integrated Services Digital Network
• DOJ — Department of Justice (US)
• PUB — Publication (file name extension)
• AAS — Adaptive Antenna System
• CDMA — Code Division Multiple Access (voice/data transmission)

• SZ — Seizure
• SIL — Silence
• AEC — Architecture, Engineering, Construction
• TO — Technical Order
• DUC — Digital Up-Converter
• GB — Gigabyte
• STP — Signal Transfer Point
• URL — Universal Resource Locator
• DCS — Digital Cross-Connect
• CAV — Constant Angular Velocity
• PDC — Personal Digital Cellular
• DRAM — Dynamic Random Access Memory (dee-ram) (computing)
• WE — Western Electric
• EMEA — Europe, Middle East and Africa
• SMR — Specialized Mobile Radio
• CCTA — Central Computer and Telecommunications Agency
• SL — Single Line
• SOHO — Small Office Home Office
• DBS — Direct Broadcast Satellite
• TCM — Trellis-Coded Modulation
• PMP — Project Management Professional
• NIC — Network Interface Controller
• VT — Virtual Terminal
• FRS — Family Radio Service
• CBP — Coded Block Pattern
• TAD — Telephone Answering Device
• JAN — Joint Army-Navy
• DSS — Decision Support System
• EPABX — Electronic Private Automatic Branch Exchange
• MAI — Multiple Access Interference
• PC — Peripheral Controller
• EM — Electromigration
• SAIC — Science Applications International Corporation
• OSI — Open Systems Interconnection (iso Standard)
• AAF — Advanced Authoring Format
• WTLS — Wireless Transport Layer Security
• T-CARRIER — Trunk Carrier
• ECO — Engineering Change Order
• BOD — Bandwidth on Demand
• CTD — Cumulative Trauma Disorder
• DDL — Digital Data Link
• PIN — Personal Identification Number
• CIS — CompuServe Information Service
• S/D — Source/Drain
• DCS — Digital Cross-connect System
• BNSC — British National Space Centre
• STI — Speech Transmission Index
• CGSA — Cellular Geographic Service Area
• SRM — Scalable Reliable Multicast
• ITSEC — Information Technology Security Evaluation Criteria

• ITP — Interactive Telecommunications Program
• FAQ — Frequently Asked Questions (sometimes Pronounced Fak)
• SLIC — Subscriber Line Interface Circuit
• O/S — Operating System
• RFI — Request For Information. Sales department shorthand. Special priority when use in conjunction with RFN (see below).
• NRC — National Research Council (Canada)
• FXS — Foreign Exchange Subscriber
• TLK — Talk
• CAD — Computer Aided Designer
• ESTEC — European Space Research and Technology Centre
• ATC — Advanced Technology Center
• DL — Data Link
• SLP — Service Location Protocol
• I.LINK — IEEE 1394, High Performance Serial Bus, implementation
• SLV — Satellite-Launch Vehicle
• SB — Switchboard
• PERT — Program Evaluation and Review Technique
• ASIC — application-specific integration circuit
• STD — Subscriber Trunk Dialing
• EDVAC — Electronic Discrete Variable Automatic Computer
• MTSO — Mobile Telephone Switching Office
• LLU — Local Loop Unbundling
• YL — Young Lady
• CFA — Carrier Facility Assignment
• TSE — Toronto Stock Exchange
• SPM — Scanning Probe Microscope
• OLAP — Online Analytical Processing
• SPX — Sequenced Packet Exchange
• ARA — Apple Remote Access
• BPS — bits per second
• CSMA/CD — Carrier sense multiple access / collision detection
• ADN — Advanced Digital Network
• SQ — Service Quality
• CBWFQ — Class Based Weighted Fair Queueing
• SNMP — Simple Network Management Protocol (ATM)
• CMT — Cadmium Mercury Telluride
• SRS — Software Requirements Specifications
• IRS — U.S. Internal Revenue Service
• CB — Citizens' Band
• ETF — Early Termination Fee
• WDN — Wireless Developer Network
• OS — Operating System
• PVD — Physical Vapor Deposition
• MV — Motion Vector
• NLMS — Normalized Least Mean Square
• SD — Speed Dial
• BPR — Business Process Re-engineering
• DARPA — Defense Advanced Research Projects Agency (US)
• AP — Action Point
• RAEX — Roaming Agreement EXchange

• PSTN — Public Switched Telephone Network
• KISS — Keep It Simple Stupid
• CS — Central Station
• ELF — Extremely Low Frequency
• ISM — Industrial, Scientific and Medical
• COO — Chief Operation Officer
• MX — Mixer
• WYSIWYG — What You See Is What You Get (pronounced Wizzy-wig. See Entry For Derived Acronyms)
• COM — Comedy Central
• PDT — Portable Data Terminal
• CAP — Capability
• SN — Service Number
• AC — Area Code
• VPN — Virtual Private Network (ATM)
• BR — Branch
• EMR — Electromagnetic Radiation
• GSA — U.S. General Services Administration
• CT — Computer Terminal
• NOAA — National Oceanic and Atmospheric Administration (US)
• RDS — Rate Determining Step
• AMLCD — Active Matrix Liquid Crystal Display
• DM — Domain Model
• M-CSI — Mobility management CAMEL (Customized Applications for Mobile network Enhanced Logic) Subscription Information
• MHS — Message Handling System (electronic)
• SOGA — Share of Gross Adds
• OSCAR — Orbiting Satellite Carrying Amateur Radio
• FCA — Free Carrier Absorption
• VAZO — Violating All-Zero Octet
• GMRS — General Mobile Radio Service
• SIA — Securities Industry Association
• DPL — Digital Power Line
• VLF — Very Low Frequency
• C — Collector
• CI — Common Interface
• SATAN — Security Administrator Tool for Analyzing Networks
• MTTR — Mean Time To Repair
• DMTS — Distinguished Member Of Technical Staff
• P — Priority
• TAM — Telephone Answering Machine
• GOS — Grade Of Service
• T-IC — T-interConnect
• LD — Laser Diode
• NPA — Numbering Plan Area
• ITU — International Telecommunication Union
• SG — Signaling Gateway (IETF)
• VG — Voice Grade
• CTU — Central Terminal Unit
• 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.
• DC — Device Control
• DSSS — Direct Sequence Spread Spectrum

• FRS — Frame Relay Service
• CP — Call Processing
• ES — Emergency Service
• SSRC — Synchronization Source
• RTC — Real-Time Control
• CAA — Civil Aviation Authority
• E — Electra
• MH — Message Handler
• DCOM — Distributed Component Object Model
• IEC — International Electrotechnical Commission
• BTC — Botswana Telecommunications Corporation
• CDA — Command and Data Acquisition
• SN — Stock Number
• DID — direct inward dial
• SSL — Secure Socket Layer
• MDM — Mobile Device Management
• SM — Service Module
• CIS — Computer and Information Science
• BSS — Base Station Subsystem
• RJ-25 — Registered Jack type 25 (6-wire connector)
• FIFO — First In, First Out
• SDU — Signal Distribution Unit
• DOS — Disk Operating System
• V — Variable
• FAS — Frame Alignment Signal
• AXE 10 — Series of electronic telephone exchanges from L.M. Ericsson
• OSP — Outside Plant
• SPIN — Service Provider Identification Number
• COPS — Common Open Policy Service
• AADC — Automated Area Distribution Center
• SPADATS — Space Detection And Tracking System
• SCU — System Control Unit
• DSL — Digital Subscriber Line
• IRC — International Record Carrier
• PC — Personal computer (host)
• WAYP — White and Yellow Pages
• BGP — Border Gateway Protocol (routing protocol)
• ER — Extended Range
• DII — Dynamic Invocation Interface
• REPT — Report
• MIDP — Mobile Information Device Profile
• BSS — Base Station System
• PSD — Phase-Sensitive Detector
• PU — Physical Unit (IBM)
• EU — End User
• RARP — Reverse Address Resolution Protocol
• RP — Reference Point
• CAM — computer aided manufacturing
• AWT — Agence Wallonne des Télécommunications
• CSC — Common Signaling Channel

• AAAS — American Association for the Advancement of Science
• HZ — cycles per second (hertz)
• AMHS — Automated Message Handling System
• KBYTE — Kilobyte (103)
• BIP — Bit-Interleaved Parity
• ST — Such That
• XPS — X-Ray Photoelectron Spectroscopy
• DMI — Distributed Management Interface
• OSTP — Office of Science and Technology Policy
• RSVD — Reserved
• BMS — Business Management System
• CGA — Color Graphics Adapter
• DL — Definition List
• MTS — Message Transfer System
• ACF — Access Control Field
• ROI — Return on Investment
• DTN — Data Transfer Network
• PSS — Performance Support System
• SSM — Spread Spectrum Modulation
• BSOD — Blue Screen Of Death
• CRC — Contrôle de Redondance Cyclique (French: Cyclic Redundancy Check)
• FCS — Frame check sequence (Ethernet)
• PRI — Primary Rate Interface (ISDN)
• SQL — Structured Query Language
• CIP — Carrier Identification Parameter
• ACP — Access Control Point
• DSN — Deep Space Network - network of large antennas and communication facilities.
• SOW — Statement Of Work
• PDU — Protocol data unit (such as segment, packet, frame, etc.)
• CRM — Customer Relationship Management
• AQL — Acceptable Quality Level
• JIT — Just in time
• ADCCP — Advanced Data Communications Control Procedures
• TAX — Trunk Automatic Exchange
• SNR — Signal-to-Noise Ratio
• JVM — Java Virtual Machine
• AMD — Advanced Micro Devices, Inc. (producer of computer chips)
• SCADA — Supervisory Control And Data Aquisition
• CAPS — Call Attempts Per Second
• CHAP — Challenge Handshake Authentication Protocol (ATM)
• XML — Extensible Markup Language
• CQA — Certified Quality Auditor
• AIF — Audio Interchange Format
• CMP — Connection Management Protocol
• PPP — Point-to-Point Protocol
• DTMF — Dual-Tone MultiFrequency
• CGA — Carrier Group Alarm
• TUR — Trunk Utilization Report
• MA — Maintenance Action
• ET — Electronic Transmission

• T — Temperature
• NNTP — Network News Transfer Protocol
• GI — Graded-Index
• EDD — Envelope Delay Distortion
• PM — post meridian
• DDU — Disk Drive Unit
• DASD — Direct Access Storage Device
• LED — law enforcement desk; light emitting diode
• CE — Channel Element
• ISAS — Institute of Space and Astronautical Sciences (Japan)
• OAM&P — Operations, Administration, Maintenance & Provisioning
• MAC — Media Access Control
• DAP — Distributed Array Processor
• BOSS — Binary Object Storage System
• ROFL — Rolling on the floor laughing
• DMA — direct memory access (computer term)
• CPN — Cisco Powered Network
• AIT — Automatic Identification Technology
• MLP — Mobile Location Protocol
• NCSC — National Computer Security Center (NSA)
• BIU — Bus Interface Unit
• RDF — Radio Direction Finder
• SDLC — Synchronous Data Link Control
• SABGW — System Architecture Evolution Gateway
• WAR — Weekly Activity Report
• HTTPS — HyperText Transfer Protocol Secure
• TNX — Thanks
• PVC — Permanent Virtual Connection
• ADC — Administration Center
• SPA — Software Publishers Association
• ASARS — Advanced Synthetic Aperture Radar System
• FTTH — Fiber To The Home
• TOVS — TIROS Operational Vertical Sounder
• IOC — Inter-Office Channel
• LDAP — Lightweight Directory Access Protocol (pronounced Ell-dap)
• NES — Network Encryption System
• TELECOMMUTE — Telecommuting
• DSP — Digital Signal Processor
• PKI — Public Key Infrastructure (cryptography)
• LS — Loop Start
• MA — Message Analysis
• SAF — System Access Fee
• RPM — Revolutions Per Minute, (Rotations Per Minute)
• ASD — Alternative Service Delivery
• NTP — Network Time Protocol
• WLAN — Wireless Local Area Network
• MME — Mobility Management Entity
• ECMA — European Computer Manufacturer's Association
• TDM — Time Division Multiplexer
• TRS — Telecommunications Relay Service

• AN — Access Node
• IRS — Inertial Reference System
• PMT — Program Management Team
• IPM — Inches Per Minute
• PCI — Personal Computer Interface
• MTU — Maximum Transmission Unit
• NF — Noise Factor
• IMP — Interface Message Processor
• ILD — International Long Distance
• DLL — Dynamic Link Library (computer file)
• CRO — Central Records Office
• DM — Differential Mode
• MP — Modulation Parameter
• TOA — Time Of Arrival
• CRTS — Cellular Radio Telecommunications Service
• ACO — Additional Call Offering
• RACF — Resource Access Control Facility
• EEA — European Economic Area
• SOAP — Simple Object Access Protocol
• DSTE — Digital Subscriber Terminal Equipment
• SAE — Society of Automotive Engineers
• LNP — Local Number Portability
• RTU — Remote Terminal Unit
• CLI — Command line Interface (Cabletron)
• DID — data item description
• COT — Central Office Terminal
• QPSK — aeronautical quadrature phase shift keying
• IEC — Interexchange Carrier
• CMRS — Commercial Mobile Radio Service
• CONUS — Contiguous United States
• FOD — Fax on Demand
• OML — Object Model Library
• DDE — Dynamic Data Exchange (in software parlance)
• AFSK — Audio Frequency Shift Keying
• SSM — Synchronization Status Message
• PCM — Pulse-Code Modulation
• AP — access point
• DPL — Digital Private-Line
• ALOC — Average Length Of Call
• ARINC — Aeronautical Radio Incorporated
• DGPT — Directorate General of Posts and Telecommunications
• CCP — Compression Control Protocol
• MPI — Minimum Picture Interval
• CP — Change Proposal
• CDT — Central Daylight Time
• VTC — Video Teleconference
• BCH — Binary Coded Hexadecimal
• CIC — Carrier Identification Code
• CIP — Channel Interface Processor
• RTN — Regional Telecommunication Network

• ASP — Application Service Provider
• POP — Point Of Presence (Internet)
• SIC — Standard Industrial Classification (Code)
• DRM — Digital Rights Management
• RNX — Restricted Numeric eXchange
• CND — Calling Number Display
• NMR — Nuclear Magnetic Resonance
• FCC — Federal Communications Commission (US)
• MSW — Most Significant Word
• AVR — Automated Voice Response
• SWAP — Shared Wireless Access Protocol
• FI — Format Identifier
• VC-ATOD — Virtual Clearinghouse on Alcohol, Tobacco and Other Drugs
• OTDOA — Observed Time Difference of Arrival
• EAI — Enterprise Application Integration
• EHF — Extremely High Frequency
• PPARC — Particle Physics and Astronomy Research Council
• COO — Cell of Origin
• BIS — Business Information System
• MC — Maintenance Control
• NIST — National Institute of Standards and Technology
• BA — Behaviour Aggregate
• POTS — Plain Old Telephone Service (FCW)
• DCA — Dynamic Channel Assignment
• INSAT — Indian National Satellite
• CVR — Crystal Video Receiver
• AT&T — American Telephone and Telegraph (U.S. company, also known as "Ma Bell")
• BPDU — Bridge Protocol Data Unit
• SIM — Subscriber Identification Module
• SN — Switching Network
• SMS — Service Management System
• ASA — Acoustical Society of America
• CMA — Communications Management Association
• ILEC — Incumbent Local Exchange Carrier
• LPE — Liquid Phase Epitaxy
• TSO — Telecommunications Service Order
• DTI — Department of Trade and Industry (UK)
• EEG — Electro-EncephaloGram
• WHT — Walsh-Hadamard Transform
• SDM — Service Delivery Management
• ADT — American District Telegraph Company
• FGA — Feature Group A
• ARIN — American Registry for Internet Numbers
• VN — Virtual Network
• CDM — Conceptual Data Model
• RFD — Request For Discussion
• USA — Underground Service Alert
• CMS — Content Management System
• LANE — Local Area Network Emulation
• NC — Network Channel

• LOO — Likelihood of Occurrence
• IAT — Integrated Access Terminal
• MIPS — Millions of Instructions Per Second
• CS — Convergence Sublayer (ATM)
• AWG — American Wire Gauge
• EMR — Electromechanical Relay
• AYT — Are You There
• PM — Project Manager
• PACS — Personal Access Communications System
• TTY — Teletype Telex Machine
• EMC — Electromagnetic Compatibility
• VOIP — Voice Over IP (Internet Protocol)
• IR — International Roaming
• FC — Frame Control
• RXQUAL — Received Signal Quality
• CCD — Charge Coupled Device - a device for the movement of electrical charge.
• BAN — Base Area Network
• PBX — Private Branch eXchange (company phone system)
• FSK — Frequency-Shift Keying
• OC-9 — Optical Carrier Signal, Level 9
• TT — Text-Telephone
• CRV — Call Reference Value
• MR — Mobile Router
• NBS — National Bureau of Standards (US)
• CFO — Communication Filing Officer
• ICL — Inserted Connection Loss
• CSR — Customer Service Report
• FIPS — Federal Information Processing Standard
• CMM — Capability Maturity Model
• RAID — Redundant Array of Inexpensive Disks
• DCN — Design Change Notification
• RDF — Resource Description Framework
• ADM — Administration Building
• TOS — Temporarily Out of Service
• SSN — Switched Service Network
• CAM — Common Access Method
• ADC — Access Deficit Charge
• RAU — Remote Access Unit
• ODBC — Open Database Connectivity
• IRS — Interface Requirements Specification
• NEMA — National Electric Manufacturer's Association
• DAHDI — Digium/Asterisk Hardware Device Interface
• TU — Transmission Unit
• MIT — Massachusetts Institute of Technology (U.S.)
• BSC — Bi-Synchronous Communications
• OT — Office of Telecommunications
• ASDE — Airport Surface Detection Equipment
• EDC — Electronic Dispersion Compensator
• EGP — Exterior Gateway Protocol
• 1000BASE-T — 1000 Megabits per Second, Baseband, Twisted Pair

• 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
• 3G — Third Generation mobile phone network
• CG — Center of Gravity (DXS)
• RP — Radio Port
• DSI — Digital Speech Interpolation
• TCIC — Trunk Circuit Identification Code
• OC-18 — Optical Carrier Signal, Level 18
• TD — Transmit Data
• AOS — Alternate Operator Service
• ACAP — Application Configuration Access Protocol
• BT — Burst Tolerance
• CHF — Swiss Franc
• 100BASE-T4 — 100 Megabits per Second, Baseband, Four-pair Category 3 UTP cables
• ACTV — Active
• RDT — Recall Dial Tone
• GAN — Global Area Network
• CST — Central Standard Time (UTC-6 Hours)
• SML/SMS — Service Management Layer/Service Management Service
• DTI — Digital Trunk Interface
• FGD — Feature Group D
• MIB — Management Information Base (ATM)
• KHZ — kilohertz (1000 cycles per second)
• EC — European Community
• DMS — Data Management System
• CPC — Calling Party Control
• TC — Transmission Convergence (ATM)
• SCPC — single channel per carrier
• LASA — Large Aperture Seismic Array
• PIM — Personal Information Manager
• HVAC — Heating, Ventilation, and Air Conditioning
• BIOS — Basic Input Output System
• LDN — Local Directory Number
• MPEG — Motion Picture Experts Group
• ERP — Enterprise Resource Planning
• TCB — Telecommunication Certification Body
• RSS — Really Simple Syndication
• DQPSK — Differential Quadrature Phase-Shift Keying
• SAR — synthetic aperture radar (satellite)
• COC — Central Office Connection
• CCCH — Common Control Channel
• TCSEC — Trusted Computer System Evaluation Criteria
• RAN — Radio Access Network
• MLM — Multi-Longitudinal Mode
• OMF — Object Management Framework
• PP — Polypropylene
• FAX — Facsimile
• WTS — Wireless Telecommunications Symposium
• EOT — End Of Transmission
• BRI — Basic Rate Interface
• RSL — Restricted Service License

• UN — United Narions
• OLE — Object Linking and Embedding (Microsoft communication protocol)
• FLM — First Line Maintenance
• WFA — Wait for Answer
• LIF — Logical Interchange Format
• ACA — Adaptive Channel Allocation
• CRS — Cell Relay Service
• PVC — Permanent Virtual Circuit (ATM)
• IMC — Intermediate Metal Conduit
• RCU — Radio Control Unit
• ISG — Information Systems Group
• BAN — Building Area Network
• ESCON — Enterprise System Connection
• DVMRP — Distance Vector Multicast Routing Protocol
• SSP — Security Service Provider
• CFD — computational fluid dynamics
• COAX — Coaxial
• DPA — Distributed-Power Architecture
• ALB — Analog Loopback
• CFD — Call For Discussion
• SVP — Senior Vice President
• CV — Coding Violation
• ATS — Abstract Test Suite
• ARM — Asynchronous Response Mode
• SCM — Supply Chain Management
• TOMS — Total Ozone Mapping Spectrometer (satellite Instrument)
• VPA — Valid Peripheral Address
• ADT — Atlantic Daylight Time (UTC-3 Hours)
• INTELSAT — International Telecommunications Satellite
• TCA — Threshold Crossing Alert
• FAC — Forced Authorization Code
• DNIC — Data Network Identification Code
• ISAKMP — Internet Security Association and Key Management Protocol
• NIST — National Institute of Standards & Technology (US)
• ISBN — International Standard Book Number (ISO 2108)
• FDI — Feeder Distribution Interface
• T&C — Terms & Conditions
• EMCON — Electromagnetic Emission Control
• UPS — Uninterruptible Power Supply
• EIGRP — Enhanced Interior Gateway Routing Protocol
• ANC — Access Network Controller
• CIFS — Common Internet File System
• CACH — Call Appearance Call Handling
• PABX — private automatic branch exchange (telephone)
• TP — Telephone Pole
• BMEWS — Ballistic Missile Early Warning System (bee-mews)
• QAM — quadrature amplitude modulation
• IANA — Internet Assigned Numbers Authority
• GS — Ground Start
• CLETS — California Law Enforcement Telecommunication System

• VSAT — Very Small-Aperture Terminal
• WWAN — Wireless Wide Area Network
• PD — Pulse Duration
• BCH — Bose-Chaudhuri-Hocquenghem Coding
• ABN — Abnormal
• VGA — Video Graphics Array
• B2C — Business-to-Consumer
• 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)
• EDP — Electronic Data Processing Plc (London Stock Exchange [LSE])
• ROTFL — Roll On The Floor Laughing
• ULL — Unbundled Local Loop
• ADM — Add-Drop Multiplexer
• NTIS — National Technical Information Service Technology Administration
• UTC — Coordinated Universal Time
• LISP — List Processing Language
• BOFH — Bastard Operator From Hell
• RMI — Remote Method Invocation
• KAK — Key-Auto-Key
• MDF — Main Distribution Frame
• B2B — Business to Businesse
• WDA — Wireless Digital Assistant
• HEHO — Head End Hop Off
• 100BASE-T — 100 Megabits per second, Baseband, Twisted pair
• ORB — Object Request Broker
• RCC — Radio Common Carrier
• PAP — Password Authentication Protocol (ATM)
• EPR — Ethylene-Propylene Rubber
• NTIA — National Telecommunications and Information Administration
• SCM — Single-Carrier Modulation
• SCR — System Change Request
• RFR — Radio Frequency Radiation
• APS — Automatic Protection Switching (SONET/SDH)
• LIDB — Line Information DataBase
• IG — Interface Group
• ALT — Accelerated Life Test
• DE — Discard Eligibility (ATM)
• SIL — Solid Immersion Lens
• SW — South West
• C³CM — Command, Control and Communications Countermeasures
• BJT — Bipolar Junction Transistor
• ASI — Asynchronous Serial Interface
• PM — Phase Modulation
• SRR — Search and Rescue Region
• PDN — Packet Data Network
• ISOC — Internet Society
• BSA — Business Software Alliance
• CDE — Common Desktop Environment
• CAUCE — Coalition Against Unsolicited Commercial Email
• CLK — Clock
• INE — Intelligent Network Element

• 10BASE-T — 10 Megabits per second, Baseband, Twisted pair
• MMM — Mobile Media Mode
• LI — Length Indicator
• LATA — Local Access and Transport Area
• TP — Transition Point
• CID — Craft Interface Device
• OC-256 — Optical Carrier Signal, Level 256
• ENIAC — Electronic Numerical Integrator And Computer
• UCF — Unregistration Confirm
• LCF — Location Confirm
• CTO — Commonwealth Telecommunications Organisation
• SAT — Satellite
• TSC — Test System Controller
• CAD — Computer-Aided Design
• UI — User Interface
• AWACS — Airborne Warning And Control System
• DSCP — Differentiated Services Code Point
• SBU — Strategic Business Units
• FR — Functional Requirement
• RRN — Routing Recording Number
• CFV — Call For Vote(s)
• SDK — Software Development Kit (Microsoft)
• IPS — Instructions Per Second
• TCC — Transmission Control Code
• CIS — Center for Integrated Systems
• DSLAM — Digital Subscriber Line Access Multiplexer (Module)
• MFC — Multi-Frequency Code
• AFM — Atomic Force Microscopy
• FCA — Fixed Channel Allocation
• ECPA — Electronic Communications Privacy Act 1986
• YA — Yet Another
• VTS — Vessel Traffic Service
• TAG — Technical Advisory Group for Biological Control Agents of Weeds
• RTC — Right to Carry
• ACC — Area Control Center
• ESF — Edge Spread Function
• PDL — Positioning Data Link
• RAD — Recorded Announcement Device
• LH — Link Handler
• DLP — Data Link Processor
• DN — Distinguished Name
• EIA — Extended Interaction Amplifier
• ELINT — Electronic Intelligence Satellite
• VNS — Virtual Network System
• KB — Kilobyte: One thousand and twenty-four bytes kbps kilo bit per second
• CORBA — Common Object Request Broker Architecture
• AVL — Available
• VMS — Virtual Memory System
• COMDEX — Computer Dealers Exposition
• MF — Multiple Frequency

• CPG — Converged Packet Gateway
• WARC — World Administrative Radio Conference
• PCCA — Portable Computer Communications Association
• SHA — Secure Hash Algorithm
• LMS — Learning management system
• O&M — Operation and Maintenance
• WAE — Wireless Application Environment
• APDU — Application Protocol Data Units
• BP — Block Parity
• VF — Voice Frequency
• TP — Termination Point
• JPEG — Joint Photographic Experts Group (24-bit image storage format)
• JRE — Java Runtime Environment
• DPT — Dynamic Packet Transport
• B3G — Beyond Third Generation
• GHZ — Gigahertz
• IPS — InPlane Switching
• DAT — Digital Audio Tape
• RCP — Right-Hand Circular Polarization
• QDR — Quad Data Rate
• QS — Quasi-Synchronous
• TED — Triteal Enterprise Desktop
• LB — Local Battery
• QI — Quality Indicator
• ADB — Apple Desktop Bus
• DIL — Direct Inward Line
• CLD — Cross-Layer Design
• BIS — Brought Into Service
• FNN — Full National Number
• CAPTAIN — Character And Pattern Telephone Access Information Network
• ETN — Electronic Tandem Network
• ECM — Electronic Counter Measures
• MGC — Multimedia Gateway Controller
• CT — Cordless Telecommunications
• UMTS — Universal Mobile Telecommunications Service
• ARQ — Automatic Repeat-reQuest
• WIN — Wireless Intelligent Network
• NCF — Network Control Facility
• BLER — Block Error Rate
• GLT — Great Lakes Telecom
• EULA — End User License Agreement (usually in reference to software)
• DDN — U.S. Defense Data Network
• ECS — Encryption Control Signal
• FEC — Forward Error Correction
• FMS — Fixed Mobile Substitution
• VR — Virtual Router
• SPID — Service Profile Identifier
• OMP — Open Management Platform
• DTD — Document Type Definition (XML)
• SCC — Specialized Common Carrier

• TNI — Telephone Network Interface
• ELT — Emergency Locator Transmitter
• DNIS — Dialed Number Identification Service
• EEPROM — Electrically Erasable Programmable Read-Only Memory
• SOS — Save Our Souls (Help!)
• EOB — End Of Business
• LCP — Local Control Point
• SCE — Service Creation Environment
• DOD — Dial on Demand
• EMS — Express Mail Service
• MCC — Mission Control Center (JSC)
• SCR — Sustainable Cell Rate
• CES — Consumer Electronics Show
• IAB — Internet Architecture Board
• DNS — Domain Name Service
• BSI — British Standards Institution
• SDH — Synchronous Digital Hierarchy (ATM)
• MMU — Memory Management Unit
• MGMT — Management
• PJC — Pointer Justification Count
• TDMA — Time Division Multiple Access
• AT — Attenuation
• ISSN — International Standard Serial Number (ISO 3297)
• PSK — phase-shift keying
• ET — Exchange Terminal
• TDD — Time Division Duplex
• OTA — Office of Technology Assessment (U.S.; abolished by Congress, Fall 1995)
• 2W — Two Wire
• NDVI — Normalized Difference Vegetation Index
• EVA — Electronic Video Agent
• VCA — Voice Connecting Arrangement
• CFNRY — Call Forwarding on No Reply
• HSS — Home Subscriber Server
• ISI — Intersymbol Interference
• CCSD — command communications service designator; control communications service designator
• EFS — Encrypting File System
• EMS — Element Management System (ATM)
• EST — Establish
• GBT — Ground Based Tower
• 3GPP — Third Generation Partnership Project
• RSVP — Resource Reservation Protocol (Internet)
• TCO — Total Cost of Ownership
• PM — Processable Mode
• MBPS — Megabits per second
• RDI — Remote Defect Indicator (UNI Fault Management)
• CSO — Customer Service Operations
• OWS — Operator Work Station
• USGS — United States Geological Survey (DOI)
• ASN.1 — Abstract Syntax Notation One
• CRIS — Carrier Route Information System

• DA — deca
• DIBL — Drain-induced Barrier Lowering
• CPS — characters per second
• SE — Southeast
• NSS — Network Switching Subsystem
• 911 — Emergency Services Phone Number
• APPL — Application
• L2TPV3 — Layer 2 Tunneling Protocol Version 3
• WAP — Wireless Application Protocol
• IAD — Integrated Access Device
• WMO — World Meteorological Organization (ICSU)
• 2G — Second generation cellular
• RADIUS — Remote Authentication Dial-In User Service
• RSS — root-sum-square
• RMS — root mean square (preferred over "RMS")
• OFC — Office
• TCS — Telephony Control Specification
• OOP — Object-Oriented Programming
• NAT — Network Address Translation
• LRQ — Location Request
• EISA — Extended Industry Standard Architecture
• VLSI — Very Large-Scale Integration
• CM — Connection Manager
• NRPB — National Radiological Protection Board
• WTO — World Trade Organisation
• UART — Universal Asynchronous Receiver/Transmitter
• P&A — Privacy and Authentication
• TP — Transaction Processor
• DPDU — Data Protocol Data Unit
• MSDP — Multicast Source Discovery Protocol
• SSMA — Spread-Spectrum Multiple Access
• FITL — Fiber-In-The-Loop
• BER — Basic Encoding Rules (ASN.1)
• CGM — Computer Graphics Metafile
• SIGTRAN — Signaling Transport
• LRC — Learning Resource Center
• VPX — Virtual Path Cross-Connect
• CPAP — Customer Premises Access Profile
• FOSE — Federal Office Systems Exposition
• CAL — Calorie
• RSN — Real Soon Now [which may be a long time coming]
• RICK — Repeater Interface Communications Kit
• VO — Voice Only
• TDOA — Time Difference Of Arrival
• EDT — Eastern Daylight Time
• SISIR — Singapore Institute of Standards and Industrial Research
• ACPI — Advanced Configuration and Power Interface
• HEX — Hexadecimal (base 16)
• KDC — Kerberos Key Distribution Center
• NIU — Network Interface Unit

• TCM — Time Compression Multiplexer
• COMINT — Communications Intelligence
• TFTP — Trivial File Transfer Protocol (ATM)
• FTTC — Fiber To The Curb光纤到路边
• TOC — Telecommunication Operations Center
• AFOSR — Air Force Office Of Scientific Research(USA)
• VSC — Vertical Service Code
• LVM — Line Verification Module
• RISC — Reduced Instruction Set Computing
• TEI — Terminal Endpoint Identifier
• LSW — Least Significant Word
• ANI — Automatic Number Identification (Caller ID)
• EA — Extended Address Field Bit
• KM — Knowledge Management
• EBCDIC — Extended Binary-Coded Decimal Interchange Code
• SNA — System Network Architecture
• CRBT — Caller Ring Back Tone
• VPI — Virtual Path Identifier
• DDM — Data Distribution Manager
• ASAR — Advanced Synthetic Aperture Radar 
• FAT — File Allocation Table
• VOC — Volatile Organic Compounds (air pollution)
• VCR — Videocassette Recorder
• FMR — Follow Me Roaming
• SDP — Software Development Plan
• TL1 — Transaction Language 1
• STMR — Sidetone Masking Rating (telecommunications)
• OSS — Operations Support System
• FEP — Front-End Processor
• FASB — Financial Accounting Standards Board
• AOL — America on line
• RBS — Robbed Bit Signaling
• EMF — Event Management Framework
• CMT — Commercial Metering Transponder
• TRS — Trunked Radio Systems
• DVB — Digital Video Broadcasting
• SPD — Serial Presence Detect
• FEP — Front End Processor
• WTL — Wireless Transport Layer
• HLR — Home Location Register
• JCL — Job Control Language
• PY — person-year
• WAIS — Wide Area Information Server
• BUS — Business
• TKIP — Temporal Key Integrity Protocol
• WSFL — Web Services Flow Language
• FPS — Framing Pattern Sequence
• VLF — Vertical-Laminar-Flow
• RJE — Remote Job Entry
• LXT — Local Exchange Terminal

• 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
• ACLR — Adjacent Channel Leakage Ratio
• CTE — Computer Telephony Engineer
• RDT — Remote Digital Terminal
• AMP — amplifier / amplification
• YYP — Yahoo Yellow Pages
• EDSX — Electronic Digital Signal Cross-Connect
• AAP — Alternate Access Provider
• VBA — Visual BASIC for Applications
• AWG — arrayed waveguide grating
• WPM — speech--words per minute
• CDM — Configuration Data Manager
• POP — Post Office Protocol
• LMS — Location and Monitoring Service
• NII — National Information Infrastructure (USA)
• DXC — Digital Cross Connect
• SIO — Service Information Octet
• DIV — Divisionsion
• DCE — Data Communication Equipment
• ALI — Automatic Location Information
• CPH — Call Party Handling
• CLDC — Connected Limited Device Configuration
• CRB — Cramer-Rao Bound
• ACSE — Association Control Service Element
• ECM — Error Correction Model
• FTTK — Fibre To The Kerb
• SMB — Server Message Block
• CBR — Constant Bit Rate
• DCS — Data Collection System (NOAA Polar Orbiting Satellites)
• ICANN — Internet Corporation for Assigned Names and Numbers
• CSPRM — Common Signaling Protocols Resource Module
• IMEI — International Mobile Equipment Identity
• TEL — Telephone
• OD — Outside Diameter
• WVOIP — Wireless Voice over Internet Protocol
• NRP — Network Resource Planning
• WIPO — World Intellectual Property Organization
• APN — An Access Point Name
• LLA — Link Level Access
• SPGA — Staggered Pin Grid Array
• DSS — Digital Signature Standard
• TSR — Terabit Switch/Router
• PST — Pacific Standard Time (UTC-8 Hours)
• BCDIC — Binary Coded Decimal Interchange Code
• C4 — Command, Control, Communications, and Computers
• ABBR — Abbreviation
• WAR — Wireless Access Revolution
• CSPDN — Circuit Switched Public Data Network
• DER — Distinguished Encoding Rules
• ASN.1 — Abstract Syntax Notation 1

• OXCO — Oven-Controlled Crystal Oscillator
• WSDL — Web Services Description Language
• STA — State
• ABM — Asynchronous Balanced Mode
• VHSIC — Very High-Speed Integrated Circuit
• CMD — Command
• DII — Defense Information Infrastructure
• EM — Element Manager
• PCMCIA — Personal Computer Memory Card International Association
• PSDN — Public Switched Digital Network
• LQR — Linear Quadratic Regulator
• DUA — Directory User Agent
• TACSAT — Tactical Satellite
• VOB — Versioned Object Base
• BPP — Billed Party Preference
• SR — Scanning Radiometer
• DHD — Dial Home Device
• BASIZE — Buffer Allocation Size
• LRC — Longitudinal Redundancy Check
• DQDB — Distributed Queue Dual Bus
• NMS — NetWare Management System
• SPC — Statistical Process Control. Forerunning quality theory from the 1960s to TQC and TQM.
• MIME — Multipurpose Internet Mail Extension
• PROM — Programmable Read-Only Memory
• DPDT — Double-Pole Double-Throw
• SRL — Singing Return Loss
• LP — Line Pair
• VSAT — Very Small Aperture Terminal (satellite service)
• GDM — GSM (Global System for Mobile communications) Data Module
• VLAN — Virtual Local Area Network
• OSF — Open Software Foundation
• X — X Window System
• EFT — Electronic Funds Transfer
• DDCMP — Digital Data Communications Message Protocol
• VBR — Variable Bit Rate (ATM)
• IP — Intellectual Property
• WFA — Work Force Administration
• ISC — International Switching Center
• YABA — Yet Another Bloody Acronym
• NOC — Network Operations Center
• PTT — Push to Talk Technology
• TTYL — Type To You Later
• ATB — Above-Ground Telecommunications Backbone
• PSN — Packet Switched Network
• FDTD — Finite Difference Time Domain
• CCA — Carrier-Controlled Approach
• LAG — Link Aggregation Group
• UTL — Utility
• CNG — Fax Calling Tone
• VCI — Virtual Channel Identifier

• IPCP — Internet Protocol Control Protocol
• MAG — Mobile Access Gateway
• ASQ — Alpha System Qualification
• ADN — Abbreviated Dialing Number
• EIR — Equipment Identity Register
• SMDS — Switched Multimegabit Data Service (ATM)
• GTB — Global Telecom Brokers
• DEMUX — Demultiplexer
• HPN — Home Phone Network
• CSP — Converged Service Platform
• NAS — Network-Attached Storage
• CCIR — International Radio Consultative Committee (French Acronym)
• UMA — Unlicensed Mobile Access
• TLT — Test Loop Translator
• YAHOO — You Are Hazy Over Oranges
• DPSK — Differential Phase Shift Keying
• CC — Country Code
• SMI — Structure of Management Information
• BIND — Berkeley Internet Name Domain
• UCM — Use Case Map
• FEA — Finite Element Analysis
• OSD — Onscreen Display
• DTE — Digital Terminal Equipment
• CCNA — Cisco Certified Network Associated
• STP — standard temperature and pressure (0° and 1 atm)
• SCH — Synchronization Channel
• MHO — My Humble Opinion
• CIRC — Cross-Interleaved Reed-Solomon Code
• B-ISDN — Broadband Integrated Services Digital Network
• RECON — Reconnaissance
• CQ — Communications Quality
• BNC — Bayonet Neill-Concelman
• VCC — Virtual Channel Connection (ATM)
• ACEK — Authentication Encryption Key
• ESA — Enhanced Subscriber Authentication
• ECP — Engineering Change Proposals
• BAM — Basic Access Module
• MB — Measured Business
• JDK — Java Development Kit
• WINS — Windows Internet Name Service
• PTP — Point To point Protocol
• IRQ — Interrupt Request
• NE — Network Element
• CPT — Cellular Paging Teleservice
• RDBMS — Relational Data Base Management System (Oracle)
• DAF — Directory Access Function
• MAC — Message Authenticity Check
• VDR — Voice Digitization Rate
• UML — Unified Modeling Language (Object Management Group, OMG)
• AAAI — American Association for Artificial Intelligence's

• MMS — Multimedia Message Service
• PLE — Path Length Efficiency
• ACF — Advanced Communications Function (IBM)
• DDU — Digital Data Unit
• CBEMA — Computer & Business Equipment Manufacturers Association
• AI — Adapter Interface
• CMOS — Complementary Metal Oxide Semiconductors
• BHCA — Busy Hour Call Attempt
• FR PVC — Frame Relay Permanent Virtual Connection
• WORM — Write-Once, Read-Many
• ROS — Return on Sales
• CAM — Content Addressable Memory
• DTU — Data Transfer Unit
• DARTS — Design Approach for Real-Time Systems
• DSCS — Defense Satellite Communication System
• BPSK — Binary Phase-shift Keying
• 2W — 2-Wire
• DRQ — Disengage Request
• ITA — Illinois Telecommunications Association
• LIS — Lightning Imaging Sensor
• SQL — Specified Quality Level
• RGN — Region
• SIT — Static Induction Transistor
• EBIC — Electron Beam Induced Current
• IVP — Integrated Voice Protocol
• TIFF — Tag Image File Format
• LN — Line
• POE — power over ethernetinjector
• SES — Scientific and Engineering Software
• WPAN — Wireless Personal Area Network
• TBCD — Telephony Binary Coded Decimal
• AIFF — Audio Interchange File Format
• BELLCORE — Bell Communications Research, Inc.
• CMIP — Common Management Information Protocol (ATM)
• EV — electronvolt
• MBWA — Mobile Broadband Wireless Access
• LSC — Link State Control
• RADIUS — Remote Authentication dial In User Service
• UDT — Unreliable Data Transfer
• BOM — Bit-Oriented Message
• LCR — Least Cost Routing
• RDMA — Remote Direct Memory Access
• AAV — Accountholder Authentication Value
• NFPA — National Fire Protection Association
• CPOP — Circuit Precedence Over Packet data
• LBR — Low Bit Rate
• RMON — Remote Monitoring
• IWF — Interworking Function
• CCNA — Cisco Certified Network Administrator
• CALEA — Communications Assistance for Law Enforcement Act

• EVC — Electronic Voucher Charging
• RLU — Remote Line Unit
• ACF — Access Coordination Function
• QOD — Quality of Data
• IMAP — Internet Mail Access Protocol
• CAVE — Cellular Authentication and Voice Encryption Algorithm
• DECCO — DISA Defense Commercial Communications Office
• BSS — Broadband Switching System
• LSAP — Link Service Access Point
• IRDA — Infrared Data Association
• RRC — Root Raised-Cosine
• CSP — Continuous Speech Processing
• ADF — automatic document feeder
• SVC — Switched Virtual Circuit (ATM)
• PMT — Photo Multiplier Tube
• C3I — Command, Control, Communications & Intelligence
• DCO — Dial Central Office
• HSCSWD — High-Speed Circuit-SWitched Data
• OSHA — Occupational Safety and Health Act (1970)
• CCITT — Comit? Consultatif International T?l?graphique et T?l?phonique
• 4G — Fourth Generation Wireless Systems
• APPC — Advanced Program-to Program Communications
• IPLC — International Private Leased Circuit
• QEDI — Quod Erat Demonstrandum
• DFG — difference-frequency generation
• ESP — Encapsulating Security Payload
• NFR — Near-Field Recording
• SRS — Supported Residential Services
• CBQ — Class-Based Queuing
• ECC — Emergency Communications Center
• TSGR — Transport System Generic Requirements
• NCOS — Network Class Of Service
• VSAM — Virtual Storage Access Method
• LMS — Local Measured Service
• DIS — Draft International Standard
• NOAO — National Optical Astronomy Observatories (Tucson, AZ)
• CAMA — Centralized Automatic Message Accounting
• SONET — Synchronous Optical Network
• SPA — Special Prorate Agreement
• ECR — Electronic Cash Register
• RPV — Remotely Piloted Vehicle
• SGS — Software Generation System
• TBPS — Terabits Per Second
• EFCI — Explicit Forward Congestion Indication (ATM)
• JST — Japan Standard Time
• SWBD — Switchboard
• CDA — Communications Decency Act of 1996
• MCR — Minimum Cell Rate (ATM)
• VLSI — Very-Large-Scale Integration
• AAS — Automatic Announcement Subsystem

• TACS — Total Access Cellular System
• FWA — Fixed Wireless Access
• AMPS — Advanced Mobile Phone System
• CES — Circuit Emulation Service
• TPF — Transmission Priority Field
• EBS — Electron Bombarded Silicon
• RMS — Resource Management System
• DS0 — Digital Signal Zero
• CODEC — Coder/decoder
• TRMM — Tropical Rainfall Measuring Mission (US-Japan)
• NT — New Technology, also Windows NT
• AMTFT — Active Matrix Thin Film Transistor
• BSA — Basic Service Area
• DTR — Down-Time Ratio
• S/N — Signal-to-Noise ratio
• IR — Information Request
• TSD — Type Specific Driver
• HTML — Hyper Text Markup Language
• ACT — ACTIVITY, ACTIVITIES
• SIP — Session Initiation Protocol
• NCAR — National Center for Atmospheric Research (US)
• LT — Line Termination
• TRX — Tandem Repeater eXchange
• ESP — Essential Service Protection
• TSC — Technical Standards Committee
• AMPS — Advanced Mobile Phone Service (cellular phone standard)
• NLM — National Library of Medicine (National Institutes of Health)
• CS — Connection Segment
• EMI — Electro-Magnetic Interference
• STU — Secure Telephone Unit
• STN — Station
• COP — Character Oriented Protocol
• ESCA — photoelectron spectroscopy for chemical analysis
• DDLD — Direct Dial Long Distance
• RX — Receive
• VPWS — Virtual Private Wire Service
• ECE — Economische Commissie voor Europa (United Nations) (Dutch: Economic Commission for Europe)
• DLT — Delete
• NREN — National Research and Education Network
• CTIA — Cellular Telecommunications Industry Association
• GDK — GIMP (GNU Image Manipulation Program) Drawing Kit
• DOCSIS — Data over Cable Service Interface Specification
• CEPT — Conférence Européenne des Administrations des Postes et des Télécommunications
• ATS — Automatic Transfer Switch
• NSAP — Network Service Access Point
• NAK — Negative Acknowledge
• DCAS — Downloadable Conditional Access System
• AF — Assured Forwarding
• BDE — Borland Database Engine
• MTS — Message Transmission Subsystem

• BY — Busy
• DTAP — Direct Transfer Application Process
• NSAI — National Standards Authority of Ireland
• DACS — Digital Access and Cross-Connect System
• HSPA — High Speed Packet Access
• HDML — Handheld Device Markup Language
• RFI — Remote File Inquiry
• CIAC — Computer Incident Advisory Capability
• ATOM — Any Transport over MPLS (Multi-Protocol Label Switching)
• SCC — Signal Conversion Circuit
• DCMI — Dublin Core Metadata Initiative (Online Computer Library Center)
• DCA — Distributed Communications Architecture
• TRIG — Trigger
• SAM — Service Access Multiplexer
• PEM — Privacy-Enhanced Mail
• SS7 — Signaling System 7
• APS — Advanced Power System
• CGI — Cell Global Identity
• LMDS — Local Multipoint Distribution Service
• FH — Frequency Hopping
• BTO — Betts Telecom Oklahoma
• VRML — Virtual Reality Modeling Language
• TDD — Telecommunications Device for the Deaf
• RACH — Random Access Channel
• UPT — Universal Personal Telecommunications
• AUI — Attachment Unit Interface
• M/W — MicroWave
• CCC — CDMA Cluster Controller
• DCC — Digital Control Channel
• FOIP — Fax Over Internet Protocol
• CVD — Chemical Vapor Deposition
• BTAM — Basic Telecommunications Access Method
• RIPE NCC — Reseaux IP Europeens Network Coordination Centre
• BLOS — Beyond Line-Of-Sight
• VADB — Virtual Auto Dial Backup
• NMC — Network Management Center
• IPRC — Intellectual Property Rights Committee
• IPVX — Internet Protocol version X
• LDP — Label Distribution Protocol
• 1FB — Single line, Flat Business rate;
• PSN — Public Switched Network
• SMG — Super Master Group
• DXF — Data Exchange Format
• D-RAM — Dynamic Random Access Memory
• BDFB — Battery Distribution Feeder Bay
• ISP — International Signaling Point
• NCSA — National Center for Supercomputing Applications
• NIMBY — Not In My Back Yard
• SMU — Service Management Unit
• LEC — Local Exchange Carrier

• COFA — Change Of Frame Alignment
• BHP — Burst Header Packet
• RCT — remote Control Terminal
• NDS — Novell Directory Services
• RSS — Radio Service Software (Motorola)
• CAMEL — Customized Applications for Mobile-network Enhanced Logic
• SRA — Seamless Rate Adaptation
• FEXT — Far-End Cross Talk
• IOC — Interoffice Channel
• DLL — Digital Local Line
• TM — Thematic Mapper (Landsat)
• CBMS — Computer-Based Message System
• MP — Master Processor
• IDLC — Integrated Digital Loop Carrier
• RS-422 — Recommended Standard 422 (ANSI/EIA standard for transmitting serial data)
• PTT — Push to Talk Testing
• ESN — Electronic Serial Number
• IMSI — International Mobile Subscriber Identity
• CCITT — Comite Consultatif International Telegraphique et Telephonique (now ITU-T)
• VFL — Visual Fault Locator
• FDD — Frequency Division Duplex
• MCP — Microsoft Certified Professional
• CIP — Continuous Improvement Program
• ADCCP — Advanced Data Communication Control Procedures
• NW — North West
• SMPTE — Society of Motion Picture and Television Engineers, Inc.
• BHCC — Busy Hour Call Completions
• AFRINIC — African Network Information Centre
• NTDS — Naval Tactical Data System
• RQMT — Requirement
• DDD — Direct Distance Dialing
• DDSN — Digital Derived Services Network
• B-ISDN — Broadband ISDN
• BT — Bluetooth Tablet
• CTI — Computer Telephony Integration
• L2TP — Layer 2 Tunneling Protocol
• PUK — PIN (Personal Identification Number) Unlocking Key
• IPTD — Internet Protocol Telephony Design
• RYP — Russian Yellow Pages
• DL — Downlink Message
• FECN — Forward Explicit Congestion Notification (ATM)
• SPT — System Page Table
• IDF — Independent Distribution Frame
• TTL — ToS and Time-to-Live
• MAP — Mobile Application Part
• ATIS — Automatic Transmitter Identification System
• ARAI — Adjunct Route Application Interface
• AMSS — Automatic Message Switching System
• TPS — Telephone Preference Service
• VOB — Voice Over Broadband

• PARC — Palo Alto Research Center
• ATL — Atlanta
• OCC — Occupancy
• MED — Manipulative Electronic Deception
• SHR — Self-Healing Ring
• SVC — Single Voice Coil
• CMC — Career Management Center
• AMOLED — Active Matrix Organic Light-Emitting Diode
• DSN — Defense Switched Network
• CAR — committed access rate
• AAS — advanced automation system (FAA)
• 4W — Four-Wire
• TCP/IP — Transmission Control/Internet Protocol
• CONS — Connection-oriented Network Services
• TDWR — Terminal Doppler Weather Radar
• DPNSS — Digital Private Network Signaling System
• MGCP — Multimedia Gateway Control Protocol
• CRLF — Carriage-Return Line-Feed
• CPN — Customer Premise Network
• SMS — System Management Server
• SDCCH — Standalone Dedicated Control Channel
• ALT — Automatic Link Transfer
• AAV — Alternate Access Vendor
• CDV — Compressed Digital Video
• EGSM — Extended Global System for Mobile Communications
• IOS — Internet Over Satellite
• NAFTA — North American Free Trade Agreement
• EA — expedited acknowledgement
• NCP — Network Control Protocol
• IEEE — Institute of Electrical and Electronics Engineers
• PBT — Polybutylene Terephthalate
• IRTF — Internet Research Task Force
• ASE — Application Service Element
• * — Star, special function key
• DISA — U.S. Defense Information Systems Agency
• ACM — Address Complete Message
• FTTB — Fiber To The Building
• GMSS — Global Mobile Satellite System
• OLS — Optical Line System
• DS-0 — Digital Signal, Level 0
• CLCC — Ceramic Leaded Chip Carrier
• PIC — Programmable Interrupt Controller
• CSCW — Computer-Supported Cooperative Work
• DMI — Desktop Management Interface (computing)
• FMC — Fixed Mobile Convergence "Mobile UC or Unified Communications over Wireless"
• CCR — Customer Controlled Reconfiguration (Sprint)
• SDSL — Symmetric Digital Subscriber Line
• MTI — Moving Target Indicator
• WCDMA — Wideband Code Division Multiple Access
• SMSC — Short Message Service Center

• MOD — Modulo
• CU — Cooling Unit
• AS — Active Service
• URN — Uniform Resource Namespace
• DM — Design Manager
• IRF — Impulse Response Function
• SXS — Step-By-Step
• FCA — Free Carrier Alongside
• DOT — Department of Telecommunications (India)
• GBPS — Gigabits per second
• NE — North-East
• STA — Science and Technology Agency (Japan)
• STM — Synchronous Transfer Mode
• SSAP — Source Service Access Point
• LOP-P — Loss Of Pointer - Path
• MOS — Metal Oxide Semiconductor (FET Devices)
• CNG — comfort noise generation
• DBN — Dial-Back Number
• APS — American Protective Services
• AFPS — Automatic Facility Protection Switching
• WAW — Wide Area Wireless
• P2P — Person-to-Person
• PNP — Plug-and-Play
• F — Frequency
• AL — Alignment
• SAR — Segmentation and Reassembly (ATM)
• RCR — Research and Development Center for Radio Systems
• CSR — Customer Service Request
• NCP — Network Control Program
• DPST — Double-Pole Single-Throw
• LPD — Low Probability of Detection
• SITA — Société Internationale de Télécommunications Aéronautiques
• FDOA — Frequency Difference Of Arrival
• RADSL — Rate Adaptive Digital Subscriber Line
• PRM — Performance Report Message
• ASEAN — Association of South East Asian Nations
• PLL — Phase Locked Loop
• MLA — Modern Language Association
• DLCI — data link connection identifier
• DPCM — differential pulse code modulation
• C² — Command and Control
• TSI — time-slot interchange
• FD — Full Duplex
• VTAM — Virtual Telecommunication Access Method
• CSU — Channel Service Unit
• IBSS — Independent Basic Service Set
• CCLC — Carrier Common Line Charge
• DAC — Digital-To-Analog Converter
• FTTP — Fiber To The Premises
• NWK — Network

• UBR — Unspecified Bit Rate
• DMS — Defense Messaging System
• USF — Universal Service Fund
• LORAN — Long Range Aid to Navigation System
• VESA — Video Electronics Standards Association
• ARSR — Air Route Surveillance Radar
• 4 GIG — 4 Giga Intellectual Gadget
• BC — Basic Call
• AB — Answer Back
• WNAP — Wireless Network Access Point
• DDD — Direct Distance Dial
• ADM — Administration, Office of
• DISN — Defense Information Systems Network
• DSSSL — Document Style Semantics and Specification Language
• MEH — Mobile-Executed Handoff
• DW — Deep Water
• DNA — Do Not Answer
• HFC — Hybrid Fiber/Coaxial network
• CSIRO — Commonwealth Scientific and Industrial Research Organization
• B2B — Business-to-Business
• SDP — Session Description Protocol
• ESPN — Entertainment and Sports Programming Network
• RCS — Radar Cross Section
• QOI — Quality of Information
• AGCH — Access Grant Channel
• SINAD — SIgnal-to-(Noise And Distortion) ratio
• UMTS — Universal Mobile Telecommunications Standard
• MOC — Maintenance and Operations Console
• DDI — Direct Dialing Incoming
• DECT — Digital Enhanced Cordless Telecommunication
• DORK — Disciples Of The Righteous King
• 4WAI — Four-Wire Analog Interface
• SVI — Service Interception
• CSAA — Central Service Area Authority
• DRFM — Digital Radio-Frequency Memory
• LQC — Line Quality Control
• DUV — Data-Under-Voice
• OIM — Operations Interface Module
• TDRSS — Tracking and Data Relay Satellite System
• AMA — automatic message accounting
• BRAN — Broadband Radio Access Network
• MAJ — Major
• NCC — Network Control Center (GSFC)
• CR — Connection Request
• DIAG — Diagnostics
• BUFR — Binary Universal Form for the Representation (of data)
• E&M — ear and mouth (special signaling leads)
• DTW — Dynamic Time Warping
• PIM — Protocol Independent Multicast
• PAM — Payload Assist Module

• LSI — Large Scale Integration -> VLSI
• SYM — Symmetric
• MOA — Managed Object Agent
• EMV — EuroPay, MasterCard, Visa
• SEM — Scanning Electron Microscopes
• ADPC — Automatic Data Processing Center
• MSRN — Mobile Station Roaming Number
• MILNET — Military Network
• PCS — Personal Communications Services
• FRAD — Frame Relay Access Device
• SPE — Synchronous Payload Envelope
• TTC — Telemetry Telecommand and Control
• AH — Authentication Header
• PNE — Path Number Efficiency
• SKU — Stockkeeping Unit
• CVT — Circuit Validation Test
• CMOS — Cellular Management Operation System
• UTP — Universal Transmission Protocol
• KSU — Key Service Unit
• SR — Slow Release
• CAM — Computer-Aided Manufacturing
• HSC — High Speed Connect
• MAPDU — Management Application Protocol Data Unit
• RAU — Radio Access Unit (Army)
• IDCU — Integrated Digital Carrier Unit
• SDN — Software Defined Network
• UASL — Unified Access Service License
• TSDU — Transport Service Data Unit
• WK — Week
• OCI — object code insertion
• CDR — Common Data Rate
• CLP — Cell Loss Priority (ATM)
• MQFP — Metric Quad Flat Pack
• SLIC — Subscriber Loop Interface Circuit
• PTT — Push to Talk Taster
• RAI — remote alarm indication
• TTY — teletype terminal
• VTAC — Vermont Telecom Advancement Center
• CS-PDU — Convergence Sublayer - Protocol Data Unit
• CALA — Customer Address Location Area
• LAAS — Local Area Augmentation System
• TVRO — Television Receive-Only
• ATR — Advanced Telecommunications Research Institute
• WSA — Wireless Security Auditor
• DNI — Data Network Interface
• APR — Alarm Processing Remote
• PLCP — Physical Layer Convergence Procedure
• 2G — Second Generation Wireless Systems
• ARPT — Autorité de Régulation des Postes et Télécommunications
• CSDU — Core Service Data Unit

• VISSR — visible and infrared spin scan radiometer (GOES)
• LRM — Long Reach Multimode
• AECT — Association for Educational Communications and Technology's
• Z — Zulu Time
• 3G — Third Generation (mobile communication system)
• IDCP — Internet Device Control Protocol
• MIN — Mobile Identification Number
• MITI — Ministry of International Trade and Industry
• MMDS — Multichannel Multipoint Distribution Service
• OSA — Open System Architecture
• LQR — Line Quality Report
• GFC — Generic Flow Control (ATM)
• ASA — Avaya Site Administration
• OOK — On/Off Keying
• USPI — Universal Serial Phone Interface
• CAC — Connection Admission Control (Asynchronous Transfer Mode)
• MTD — Moving Target Detection
• BTL — Bell Telephone Laboratories, Inc.
• PSLV — Polar Satellite Launch Vehicle (Indian Space Research Organization; India)
• OBC — Onboard Computer
• AIS-L — Alarm Indication Signal - Line
• ASYNC — Asynchronous
• CHTML — Compact Hypertext Markup Language
• LDI — Long Distance Interconnect
• OMA — Open Mobile Alliance
• MIS — Miscellaneous
• INWATS — INward Wide Area Telecommunications Service
• DFE — Design For Environment
• MT — maintenance
• BCM — Bit Compression Multiplexer
• STD — Secondary Telecom District
• ASTD — American Society of Training and Development (Alexandria, Virginia)
• RSL — Request and Status Links
• ECS — Environmental Control System (Subsystem)
• FM — frequency modulation
• QR — Quality record
• PWM — Pulse width modulation
• PHY — Physical Layer
• CEE — Communaut? Economique Europ?enne
• AIS-V — Alarm Indication Signal - Virtual
• L2F — Layer 2 Forwarding protocol
• SAPI — Service Access Point Identifier
• CF — Coin First Payphone
• GOMP — Get Off My Phone
• PN — Public Network
• MPLS — Multi Protocol Label Switching
• IXC — interexchange carrier
• VF0 — Voice Fundamental Frequency
• CTTC — Centre Tecnològic de Telecomunicacions de Catalunya
• WPBX — Wireless Private Branch Exchange

• RLC — Radio Link Control
• LIM — Line Isolation Monitor
• PTM — Point-To-Multipoint
• KSPS — KiloSymbols Per Second
• CGI — Computer Graphics Interface
• JISC — Japanese Industrial Standards Committee
• RA — Return Alarm
• MTS — message transport system
• B8ZS — Binary Eight Zero Substitution
• NEMP — Nuclear Electromagnetic Pulse
• TFL — Telecom Fiji Limited
• DX — Duplex Signaling
• LMT — Lightwave Microcell Transceiver
• DCF — Distributed Coordination Function
• TOP — technical/office protocol
• CEPT — Conference of European Posts and Telecommunications
• AMR — Automated meter reading also known as Automatic Meter Reading
• EPP — Enhanced Parallel Port (PC)
• BSVCI — Broadcast Signaling Virtual Channel Identifier
• CPE — Customer Premise Equipment
• SM — Statistical Multiplexing
• VRT — Voltage Reduction Technology
• EST — Electroshock Therapy
• VAS — Value Added Services
• RSI — Record Status Indicator
• DPBX — Digital Private Branch Exchange
• CW — Call Waiting Supplementary Service
• AEA — American Electronics Association's
• REG — range extender with gain
• CC — Composite Clock (SONET)
• DAC — Digital to Analog Converter-Audio
• ALCAP — Access Link Control Application Protocol
• RNR — Receive Not Ready
• VXML — Voice eXtensible Markup Language
• DNC — Do Not Call
• BCSM — Basic Call State Model
• RCF — Remote Call Forwarding
• MFLOPS — Millions of Floating Point Operations per Second
• AEE — Agent Execution Environment
• SDNS — Secure Data Network System
• PSQM — Perceptual Speech Quality Measure
• FIOS — Fiber Optic Services
• NAM — Numeric Assignment Module
• # — Number sign, octothorp; special function key
• ATS — Air Traffic Services
• VQV — Voice Quality Value
• ADP — Automatic Data Processor
• MPU — Main Processor Unit
• TARP — Target Identifier Address Resolution Protocol
• 4GL — Fourth-Generation Language

• WDMW — Web Directory for Mobile and Wireless
• THL — Trans-Hybrid Loss
• EADAS — Engineering and Administrative Data Acquisition System
• UIH — Unnumbered Information with Header check
• DCSS — Digital Cross-connect Systems
• BSC — Base Station Controller
• ECDIS — Electronic Chart Display Information System
• ATD — Advanced Technology Demonstration
• VSM — Vestigial Sideband Modulation
• BB — Blackberry
• ACNA — Access Customer Name Abbreviation
• JDC — Japan Digital Cellular
• VVP — Versatile Voice Processing
• ADC — Advanced Data Control
• TC — Technical Committee (HL7)
• MMC — Microsoft Management Console (Microsoft)
• HTO — Hellenic Telecommunications Organisation
• EIR — Excess Information Rate
• HDTV — High-Definition Television
• WUP — Wired Up Privacy
• SA — Selective Availability (on GPS transmissions)
• ANSI — Advanced Network Signaling Input
• CLOS — Clear Line Of Sight
• NMC — Network Model Coverage
• ATRAC — Adaptive Transform Acoustic Coding
• BIC — Bus Interface Controller
• CDV — Cell Delay Variation(ATM)
• NSN — National Significant Number
• ALI — Automatic Location Identifier
• PNA — Parallel Network Architecture
• BT — Back Trace
• FPLMTS — Future Public Land Mobile Telecommunications System
• PSK — Phase Shift Key
• GSTN — General Switched Telephone Network
• MBE — Molecular Beam Epitaxy
• NLM — NetWare Loadable Module
• SDHLR — Super-Distributed Home Location Register
• DXI — Data Exchange Interface
• DMT — Discrete Multi-tone Transmission
• RS — Receive Signature
• CICS — Customer Information Control System (IBM Mainframe Software; Kicks Or C-I-C-S)
• DNSIX — Defense Network Security Information Exchange
• ACOU — Additional Call Offering Unrestricted
• SIMT — Système interbancaire marocain de télécompensation
• CBS — Common Battery Signaling
• 4WA — Four Wire Analog
• WAWS — Washington Area Wideband System
• IPXCP — Internetwork Packet Exchange Control Protocol
• ERL — Echo Return Loss
• WDF — Wireless Data Forum

• CL — cell loss
• DCB — Digital Channel Bank (Sprint)
• APTC — Atlantic Provinces Telecommunications Council
• CT — Control terminal
• BSRF — Basic System Reference Frequency
• JTF — Joint Task Force
• RCMAC — Recent Change Memory Administration Center
• STDM — Statistical Time Division Multiplexing
• NTSC — National Television Standards Committee
• TACACS — Terminal Access Controller Access Control System
• TSM — Transaction State Machine
• TOMS — Telecom Operations Management System
• ICLD — Inter-Channel Level Difference
• INAP — Intelligent Network Application Part
• SACS — Security Access Control System
• CDA — Communications Decency Act's
• DLT — Digital Line Termination
• PNP — Positive-Negative-Positive
• MIC — Management Integration Consortium
• UNI — User-Network Interface
• WFG — Wireless Firewall Gateway
• PSC — Picture Start Code
• OST — Office of Science and Technology
• MMC — Minimum Monthly Charge
• LAT — Local Area Transport (network)
• BSSMAP — Base Station System Management Application Part
• RPCU — Radio Port Control Unit
• SR — Service Request
• MODEM — modulation and demodulation
• MBMS — Multimedia Broadcast/Multicast Service
• PLCP — Physical Layer Convergence Protocol (ATM)
• DI — Document Index
• EFIS — Electronic Flight Information System
• USF — Universal Server Farm
• CSI — Clearing Subnetwork Identification
• WSP — Wireless Service Provider
• WCMP — Wireless Control Message Protocol
• MSI — Maritime Safety Information
• ADM 3X — DS3 Add-Drop Multiplex
• IS — Integrated Services
• CSA — Canadian Standards Association (like UL)
• HDSL — High-bit-rate Digital Subscriber Line
• CLI — Calling Line Identification
• CVSD — Continuous Variable Slope Detection
• ECAN — Echo Cancellation
• TIA — Telecommunications Industry Association
• E — Echo Time Zone
• CCSS6 — Common Channel Signaling System # 6
• PTT — Post Telegraph and Telecommunications
• EDFA — Erbium-Doped Fiber Amplifier

• TSAU — Time Slot Access Unit
• ROW — Rest Of World
• TDR — Time-Domain Reflectometry
• SMMR — Scanning Multichannel Microwave Radiometer
• CCS — Common Command Set
• SCORM — Shareable Content Object Reference Model
• B-CPE — Broadband Customer Premises Equipment
• DCS — Defense Communications System
• CD — Critical Dimension
• PET — positron emission tomography
• SVC — Signaling Virtual Channel
• PMMA — Polymethyl Methacrylate
• TRLR — Trailer
• WITS — Web Interface for Telescience
• 3GIP — Third Generation Internet Protocol
• DOITT — Department of Information Technology and Telecommunications
• V — Vector
• WIG — Wireless Internet Gateway
• LIU — Line Interface Unit
• EMS — Enhanced Messaging Service
• TMF — Telecommunications Management Forum
• CDF — Communications Data Field
• ML — maximum length
• CACM — Communications of the ACM
• AIU — Analog Interface Unit
• TPSP — Third Party Service Provider
• RADARSAT — Radar Satellite
• CFOT — Certified Fiber-Optic Technician
• CRBT — Color Ring Back Tone
• SFX — Special Effects
• BBCR — BroadBand Communications Research
• AFI — Authority and Format Identifier
• PRE — Preliminary
• 1-ESS — x-ESS series of Electronic Switching Systems
• LL — Lower Layer
• BMAS — Business Management System
• RADINT — Radar Intelligence
• MDN — Mobile Directory Number
• IMPI — IP (Internet Protocol) Multimedia Private Identity
• SQE — Signal Quality Error
• MDCP — Media Device Control Protocol
• DICOM — Digital Imaging and Communications in Medicine
• ARD — Automatic Ring Down
• VC — Virtual Circuit (ATM)
• DF — Direction Finding or Finder
• FTAM — File Transfer Access and Management
• WTP — Wireless Transaction Protocol
• IESG — Internet Engineering Steering Group
• TR — Temporal Reference
• HFC — Hybrid Fiber Coaxial

• WDSL — Wireless Digital Subscriber Line
• TMSI — Temporary Mobile Subscriber Identity
• STD — Standard Deviation
• WLAP — Wireless LAN (Local Area Network) Access Point
• B6ZS — Bipolar 6 Zero Substitution
• DPDCH — Dedicated Physical Data Channel
• DTS — Digital Terminal Systems
• CAAS — Communications-as-a-Service
• WDS — Wireless Distribution System
• BAC — Bar Calls
• PTO — U.S. Patent And Trademark Office
• ANAC — An Automatic Number Announcement Circuit
• PCIA — Personal Communications Industry Association
• CDDI — Copper Distributed Data Interface
• NSE — Network Software Environment
• E2E — End-to-End
• FEM — Finite Element Method
• 3G HSPA — Third-Generation High-Speed Packet Access
• IEEE-SA — Institute of Electrical and Electronics Engineers - Standards Association
• BDSL — Broadband Digital Subscriber Line
• DLU — Digital Line Unit
• ADTS — Ameritech Digital Transport Service
• 4G — Fourth Generation
• RLA — Received Level Average
• USRT — Universal Synchronous Receiver/Transmitter
• FTS — Federal Telecommunications System
• IVI — Intel Video Interactive
• BUS — Business Units
• COB — Change Of Billing
• CCSA — Common Control Switching Arrangement
• DCEF — Distributed Cisco Express Forwarding
• PDSO — Packet Data Security Overlay
• CMM — Calls, Minimums, Maximums
• DBRNC — deciBel Relative to Noise in a Circuit
• TTIL — Team Telecom International Ltd.
• FIC — Flight Information Center
• RCH — Receive Channel
• DMT — Digital-Discrete Multi-Tone
• CPS — Cycles Per Second (now Hertz)
• ZD — Zero Defects
• ASTE — Advanced Systems and Telecommunications Equipment
• TAE — Terminal Adapter Equipment
• MTA — Message Transfer Agents (Internet)
• CD — Committee Draft
• DOD — Direct Outward Dialing
• FEAC — Far End Alarm and Control
• BNCC — Base Network Control Center
• FLL — Fixed-Loss Loop
• TD-CDMA — Time Division - Code Division Multiple Access
• RZ — Return to Zero

• CERN — Conseil Europeen Pour La Recherche Nucleaire
• GRX — GPRS Roaming Exchange
• ANT — ADSL Network Terminator
• TL — Telephone Lead
• SLC — Service Level Contract
• JWG — Joint Working Groupof
• MUSIC — MUltiple SIgnal Classification
• ADTS — Automated Digital Terminal System
• RBT — Ring Back Tone
• WBMP — Wireless Bitmap
• FOTS — Fiber Optical Transmission System
• PR — Preference
• ATL — Advanced Technology Laboratory
• PT — Payload Type (ATM)
• FSK — Frequency Shift Keying
• ACE — Authentication Encryption
• STM — Scanning Tunneling Microscopy
• ANSI-41 — ANSI standard for mobile management
• TRAC — Totally Reconfigurable Analog Circuit
• DF — Distributing Frame
• JMA — Japanese Meteorological Agency
• GERAN — GSM (Global System for Mobile communications) Edge Radio Access Network
• IDC — Information Distribution Company
• LRF — Laser Range Finder
• MMSI — Maritime Mobile Service Identity
• ODS — Operational Data Store (knowledge management)
• DEM — Digital Elevation Model
• GSM — Global System for Mobile telecommunications
• IS-41 — TIA/EIA Interim Standard for mobile management
• T1 — Transmission service at the DS1 rate of 1.544 Mbps
• ACL — Asynchronous Connection-less Link
• RTNR — Real-Time Network Routing
• WPKI — Wireless Public Key Infrastructure
• ASIC — Application Specific Instruction Code
• WNMS — Wireless Network Management System
• LAPB — Link Access Protocol-Balanced
• DIP — Dialup Internet Protocol
• OID — Object Interaction Diagram
• CIS — Communications and Information Systems
• TAU — Test Access Unit
• PRM — Premium Rate
• NETBIOS — Network Basic Input-Output System
• SASL — Simple Authentication and Security Layer
• CTIT — College of Telecommunications and Information Technology
• LEC — Liquid Encapsulated Czochralski
• ONE — Other Network Entity
• TXM — Transmission X-ray Microscope
• AVT — Audio Visual Telecommunications
• VHM — Voice Health Monitor
• ADPCM — Adaptive Differential Pulse Code Modulation

• BS — Busy Season
• HUMAN — High-speed Unlicensed Metropolitan Area Network
• DACS — Digital Access Carrier System
• SYSADM — System Administrator
• PTAM — Professional Telephone Answering Machine
• NSP — National Signaling Point
• PPV — Pay-Per-View
• SCO — Synchronous Connection Oriented
• DE — Discard Eligible
• CDVT — Cell Delay Variation Tolerance
• DQDB — Distributed Queue Double Bus
• ILETS — Idaho Law Enforcement Telecommunication System
• SLBM — Submarine-launched ballistic missile
• CMI — Computer Managed Instituteuction
• ABATS — Automatic Bit Access Test System
• CYTA — Cyprus Telecommunications Authority
• NMC — Nortel Matra Cellular
• 3-D — 3-Dimensional
• CON — Concentrator
• 3GSM — Third-generation Global System for Mobile (communications)
• EECM — End-to-End Call Manager
• NESC — National Electrical Safety Code
• UPC — Usage Parameter Control
• ARFA — Allied Radio Frequency Agency
• AGPS — Assisted Global Positioning System
• ELFEXT — Equal-Level Far-End Cross-Talk
• DS-3 — Digital Signal, Level 3
• ATSC — Advanced Television Systems Committee
• CSAR — Combat Search and Rescue
• LSI — Large-Scale Integration
• CSCC — coordinated state change control
• SVW — Sioux Valley Wireless
• CNID — Calling Number Identification Display
• CNE — Certified Novell Engineer
• TELNET — Telecommunications Network Protocol
• DMT — Discrete Multi-Tone
• FLN — Fixed Line Network
• QPA — Quality Performance Analysis
• NDIS — Network Driver Interface Specification (Microsoft Windows NT)
• LFTYR — Ley Federal de Telecomunicaciones y Radiodifusión
• DMT — Discrete Multi-Tone Technology
• TDM — Time Division Multiplexing
• P — Point
• NQA — Niveau de Qualite Acceptable
• RANAP — Radio Access Network Application Part
• VPC — Virtual Path Connection (ATM)
• FAW — Frame Alignment Word
• SNI — Service Node Interface
• ITT — Invitation To Tender
• DPT — Dial Pulse Terminate

• ATMS — automatic transmission measuring system
• KEK — Key Encrypting Key
• MAHO — Mobile Assisted Handoff
• E — Exchange
• DORA — EV-DO (EVolution-Data Optimized) standard Revision A
• ULC — Universal Line Card
• MEAS — Measure
• DEO — Digital End Office
• TTY — Text Teletype
• MSC — Mobile Switching Center
• IQ — In-phase and Quadrature
• DDSD — Delay Dial Start Dial
• CM — Common Mode
• F/W — Firmware
• NECA — National Exchange Carrier Association
• GTXC — Global Telephone Exchange Carrier
• MTP — Message Transfer Part
• ITOC — Independent Telephone Operating Company
• CTS — Call Tracking System
• SSU — Synchronization Supply Unit
• DMI — Digital Multiplex Interface
• SUS — Suspension
• BHCA — Busy Hour Call Attempts
• VCT — Variable Cam Timing
• AEIMP — Apple Event Interprocess Messaging Protocol
• ULP — Upper Layer Protocol
• KTS — Key Telephone System
• ISM — Interstellar Medium
• CUG — Closed Users Group
• WBI — Wireless Broadband Internet
• KB — Knowledge-Based
• DHA — Dialogue Handling
• SS1 — Signalling System 1 (500/20 Hz tones)
• AADS — Ameritech Advanced Data Services
• ITW — International Telecoms Week
• FAT — Final Acceptance Testing
• SGCP — Simple Gateway Control Protocol
• EGPRS — Enhanced General Packet Radio Service
• IEEE-CS — Institute of Electrical and Electronics Engineers Computer Society
• GOS — Gerry Otis Simpson
• BSID — Base Station Identity
• ATCA — Advanced Telecom Computing Architecture
• CARS — Community Antenna Relay Service
• CASP — Communications Application Service Provider
• UAT — Universal Access Transceiver
• EDGE — Enhanced Data for GSM (Global System for Mobile communication) Evolution
• WCRL — Wireless Communications Research Laboratory
• SETI — Search for Extraterrestrial Intelligence
• DLC — Digital Leased Circuit
• LSP — Label Switched Path

• SVGA — Super VGA
• ISO — Independent System Operator (US) (see also TSO) Responsible for grid management, but does not own assets. (electricity)
• PTM — Packet Transport Mode
• MHL — Mobile High-definition Link
• STAN — Supply of Telstra Account Number
• LCAS — Link Capacity Adjustment Scheme
• RQMTS — Requirements
• EC — Echo Cancelling
• HTML — Hyper-Text Markup Language
• NSDI — National Spatial Data Infrastructure
• LULT — Line Unit/Line Termination
• ASP — Active Signaling Protocol
• LO — Lockout
• SLIP — Serial Line Internet Protocol
• MRVT — MTP Routing Verification Test
• WDRM — Wireless Design Reference Manual
• AA — Auto-Answer
• STE — Syrian Telecommunications Establishment
• GTM — Go to Meeting
• TJB — Telephone Junction Box
• STV — Subscription Television
• TMTC — Telemetry and Telecommand
• A/D — Analog-to-Digital converter
• LFACS — Loop Facility Assignment and Control System
• RDSS — Radio Determination Satellite Service
• ILETS — International Law Enforcement Telecommunications Seminar
• DCMES — Dublin Core Metadata Element Set
• CPP — Calling Party Pays
• APTG — Asia Pacific Telecom Group
• WIAS — Wholesale Internet Access Services
• MFJ — Modified Final Judgement
• MO — Magneto-optic
• SUBT — Subscriber Terminal
• MC — Management Center
• DTU — Data Terminal Unit
• BCST — Broadcast
• CTSO — Cellular Telephone Service Order
• WSN — Wireless Sensor Network
• TRANS — Transaction
• NMF — Network Management Forum
• TBRL — Terminal Balance Return Loss
• RSN — Regional Service Network
• QLC — Quality Com
• L — Lambert
• SMSL — Standard Multimedia Scripting Language
• BGP4 — Border Gateway Protocol 4
• PTP — Point to Point Transmission Service (electricity)
• BTS — Base Transceiver Station (cellular)
• WICD — Wireless Interface Connection Daemon
• LR-WPAN — Low-Rate Wireless Personal Area Network

• CRACK — Challenge Response for Authenticated Crypto Keys
• ACRE — Authorization and Call Routing Equipment
• DFRI — Datacom Reference Frame Input
• BATM — Basic Telecommunication Access Method
• SNI — Subscriber-Network Interface
• GOSIP — Government Open Systems Interconnection Profile
• CD-ROM — Compact Disk-Read-Only Memory
• CODEC — Coder-Decoder (usually for audio/video data)
• TCM — Tandem Connection Maintenance
• BTE — Broadband Terminal Equipment
• T&R — Tip and Ring
• REN — Ringer Equivalence Number
• STE — Software Test Environment
• TCPA — Telephone Consumer Protection Act
• NB — Narrowband
• CODASYL — COnference on DAta SYstems Languages
• MM — mismatch
• STN — Station Casinos, Inc.
• CD ROM — Compact Disc Read-Only Memory
• REA — Rural Electrification Administration (US)
• LEED — Low-energy Electron Diffraction
• SH — Shell
• ACMA — Atlantic Cable Maintenance Agreement
• ESSE — Embedded Systems Software Environment
• VOFR — Voice Over Frame Relay
• ECTEL — Eastern Caribbean TELecommunications Authority
• ENV — Environment
• CMAS — Cellular Management System
• CP — Cell Phone
• 2G — Second-generation mobile telephone system
• MEID — Mobile Equipment Identifier
• HSCSD — High-Speed Circuit-Switched Data
• BHA — Busy Hour Attempts
• BTU — Basic Transmission Unit
• DNU — Do Not Use
• RJ-14 — Registered Jack type 14 (2-wire connector)
• TWX — Teletypewriter Exchange (Telex)
• RTZ — Rate for Transmission service for a Zone load
• XDSL — "generic" Digital Subscriber Line
• DDS — Dataphone Digital Service (AT&T)
• CCR — Current Cell Rate (ATMF)
• IV&V — independent verification and validation
• NML — Network Management Layer
• CHT — Active
• RDF — Remote Distribution Frame
• RDTD — Restricted Differential Time Delay
• DQR — Directory enQuiry Restricted
• ARDIS — Advanced Radio Data Information Service
• BONDING — Bandwidth On Demand Interoperability Group
• DCS — Digital Cross-connect Switch

• FEBE — Far End Block Error (SONET)
• A/C — Air Conditioner
• DMB — Disconnect and Make Busy
• VAD — Voice Activity Detection
• DA — decanoic acid
• BPOP — Building Point of Presence
• CFNA — Call Forwarding No Answer
• SAP — Service Advertising Protocol
• GPBX — Global Private Branch eXchange
• VDV — Voice/Data/Video
• ICTA — Idaho Cable Telecommunications Association
• BUS — Broadcast and Unknown Server
• FWS — Fixed Wireless Services
• FFM — First Failure to Match
• CALS — Computer Aided Acquisition and Logistic Support
• PMOS — P-channel Metal Oxide Semiconductor
• AMTI — Airborne Moving Target Indicator
• UAC — Uniform Annual Charge
• WIRC — Wireless Information Resource Center
• WIPS — Wireless Intelligent Personal Server
• REGEN — Regenerator
• WGX — Wireless Gateway Switch
• DCC — Data Communications Channel
• LSMS — Local Service Management System
• CFS — Call for Service
• RPV — Resource Property Value
• BAOC — Barring of All Outgoing Calls supplementary service
• NSEP — National Security Emergency Preparedness
• E-TDMA — Expanded Time Division Multiple Access
• VMO — Virtual Mobile Operator
• BR — Basic Rate
• NAP — Network Access Point
• UTL — United Telecom Limited
• WITS — Washington Interagency Telecommunications System
• TPC — The Phone Company
• MDTS — Mobile Data Terminal Software
• D/I — Drop and Insert
• LSAP — Link Layer Service Access Point
• CCEA — Cross Connect Equipment Assignment
• NARSAP — National Advanced Remote Sensing Application Program
• MCF — Message Confirmation Frame
• TSP — Telecommunications Service Priority
• DR — Design Review
• TACSIM — Tactical Simulation (Simulator)
• UNI — User Network Interface
• SMT — station management (protocol)
• UR — User Rate
• DAMPS — Digital Advanced Mobile Phone System
• IPCU — iPhone Configuration Utility
• FR-SSCS — Frame Relay Service Specific Convergence Sub-Layer

• LGE — Loop- or Ground-start Exchange
• COAM — Customer Owned And Maintained
• WRED — Weighted Random Early Detection
• MNOC — Mobile Network Operation Center
• CNAD — Calling Name Delivery
• NTE — Network Terminating Equipment
• DLIS — Directory Listing Inquiry System
• FGDC — Federal Geographic Data Committee's
• CSL — component sublayer
• PMD — Physical Media-Dependent
• SQR — Signal to Quantizing noise Ratio
• O — objective
• BEAR — Billed Entity Applicant Reimbursement
• WIPI — Wireless Internet Platform for Interoperability
• S-HTTP — Service Hypertext Transport Protocol
• KSR — Key Send Receive
• NICAD — Nickel Cadmium
• NRI — Net Radio Interface
• PPCH — Packet Paging Channel
• ECTF — Enterprise Computer Telephony Forum
• ILQ — Inbound Link Quality
• ARCNET — Attached Resource Computer Network
• DVCC — Digital Verification Color Code
• WLNP — Wireless Local Number Portability
• TELECOM — Telecommunications
• ADTS-E — Ameritech Digital Transport Service - Enhanced
• SAMA — Spread Aloha Multiple Access
• ESM — electronic support measure
• EEROM — Electronically Erasable Read-Only Memory
• STS — Synchronous Transfer Signal
• CDRM — Cross-Domain Resource Manager
• ML-PPP — Multilink Point-to-Point Protocol
• MSG — Management Steering Group
• LAC — Line Assignment Center
• IPD — Intelligent Pulse Decoding
• CC — Connection Confirm
• PVRA — Physical Volume Reserved Area
• FCT — Fixed Cellular Terminal
• WCM — Wireless Connection Manager
• EDT — European Deaf Telephone
• BANC — Broadband Access Network Coordination
• DLE — Digital Local Exchange
• LBX — Low Bandwidth X
• EF&I — Engineering, Furnishing and Installation
• SMASE — Systems Management Application Service Element
• CAP — Competitive Access Provider
• AQP — Association for Quality and Participation
• ISMI — International mobile subscriber identity