Telecommunications Acronyms PDF

# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Full List Full List 3D 3-Dimensional 4GL Fourth Generation Language 5B6B 5 data Bits, 6 transmission Bits 16-QAM 16 (points) Quadrature Amplitude Modulation A/D Analog / Digital (converter) AAAI American Associa...

# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Full List Full List 3D 3-Dimensional 4GL Fourth Generation Language 5B6B 5 data Bits, 6 transmission Bits 16-QAM 16 (points) Quadrature Amplitude Modulation A/D Analog / Digital (converter) AAAI American Association for Artificial Intelligence AAB Auto Answer Back AAL ATM Adaptive Layer ABA American Banks Association ABI Application Binary Interface (Unix) ABM Asynchronous Balanced Mode AC Alternating Current (CA) ACE Advanced Computer Environment ACIA Asynchronous Communications Interface Adapter ACK ACKnowledge (char 06 - 06H) ACM Association for Computing Machinery ACTA American Carriers Telecommunication Association ADC Analog Digital Converter (A/D) ADCCMP Advanced Data Communications Control Procedures (ANSI X3.66) ADPCM  Adaptive Differential Pulse Coded Modulation ADSL Asymmetrical Digital Subscriber Line AEA American Electronics Association AFC Automatic Frequency Control AFNOR Association Fran‡aise de NORmalization AGC Automatic Gain Control AGC Automatic Generation Control AI Artificial Intelligence AIN Advanced Intelligent Network AKA Also Known As ALN Adaptive Logic Network ALU Arithmetic and Logic Unit AM Amplitude Modulation AM/FM Automatic Mapping / Facility Management AMI Alternate Mark Inversion AMPS Advanced Mobile Phone System (TIA 553) AMR Automatic Meter Reading ANI Automatic Number Identification (tel) ANOVA ANalysis Of VAriance ANSA Advanced Network System Architecture ANSI American National Standards Institute (NY) APD Avalanche Photo Diode API Application Program Interface APPC Advanced Program to Program Communication (IBM) APPN Advanced Peer to Peer Networking (IBM) ARCnet Attached Resource Computer NETwork ARO After Receipt of Order ARP Address Resolution Protocol (Layer 3) ARQ Automatic Repeat reQuest ASA American Standards Association ASAP As Soon As Possible ASCII American Standard Code for Information Interchange (7 bits - ANSI - CCITT N¦ 5) ASIC Application Specific Integrated Circuit ASK Amplitude Shift Keying ASME American Society of Mechanical Engineers ASN.1 Abstract Syntax Notation 1 (ISO 8824 8825) AT Apple Talk AT ATtention (Hayes Modems Command Prefix) AT&T American Telegraph & Telephone ATE Automatic Test Equipment ATM Asynchronous Transfer Mode (Cell-Switching, Fast Packet) ATM Automated Teller Machine ATV Advanced TeleVision AUI Attachment Unit Interface (Ethernet, 15-pin) AVC Automatic Volume Control AWG American Wire Gauge B B&W  Black and White (TV) BACnet Building Automation and Control NETwork BABT British Approval Board for Telecommunications Balun BALanced-UNbalanced BASIC Beginners' All-purpose Symbolic Instruction Code BAW Bulk Acoustic Wave BBS Bulletin Board Service BCC Block Check Character BCD Binary Coded Decimal BCH Bose Chaudhuri Hocquenguem (code) BER Bit Error Rate BERT Bit Error Rate Tester BFT Binary File Transfer BGP Border Gateway Protocol BHC Busy Hour Calls (tel) BiCMOS Bipolar Complementary Metal Oxide Silicon B-ICI Broad band Inter-Carrier Interface BIL Basic impulse Insulation Level BIOS Basic Input/Output System B-ISDN Broad band Integrated Services Digital Network BISUP Broad band ISdn User Part BISYNC BISYNChronous (BSC IBM) bit BInary digiT BITNET Because It's Time NETwork BNC Bayonet (Baby? ) Normalized Connector BNF Backus-Naur Form BOF Birds Of a Feather bpi Bits Per Inch bps Bits Per Second BPSK Binary Phase Shift Keying BQFP Bumpered Quad Flat Pack BRA Basic Rate Access BRI Basic Rate Interface (ISDN: 2x64+16 kbps) BSC Binary Synchronous Communication protocol (BISYNC - IBM) BSD Berkeley System Distribution (Unix) BSI British Standards Institution (London) BSP Binary Space Partition (tree) BSS Broad band Switching System BZT Bundesamt f’r Zulassungen in der Telekommunication (Germany) C C-MOS Complementary Metal-Oxide Silicon CAD Computer Aided Design CAI Computer Aided Instruction CAM Computer Aided Manufacturing CAM Content Addressable memory CAMAC Computer Automated Measurement And Control CAN Controller Area Network (Bosch Intel) CASE  Computer Aided Software Engineering CAST Computer Aided Software Testing CAT Computerized Axial Tomography CATV Community Antenna (CAble?) TeleVision CB Citizens Band CBDS Connectionless Broadband Data Service CBR Constant Bit Rate CCD Charge-Coupled Device CCIR Comit‰ Consultif International des Radiocomunications œ (ITU - Genˆve) CCITT Comit‰ Consultif International T‰l‰graphique et T‰l‰phonique œ (ITU - Genˆve) CCS Common Channel Signalling (SS7) (tel) CCTV Closed Circuit TeleVision CD Carrier Detect (V24) CD Compact Disc CD-A Compound Document Architecture CD-R Compact Disc Rewriteable CD-ROM Compact Disc Read Only Memory CDDI Copper Distributed Data Interface CDE Common Desktop Environment CDMA Code Division Multiple Access (Cellular, IS-95) CDPD Cellular Digital Packet Data CEBus Consumer Electronic Bus CEPT Conference Europ‰enne de Postes et T‰l‰communications CERT Computer Emergency Response Team ([email protected] - 412 268 7090) cfm Cubic Feet by Minute CGI Computer Generated Images CGM Computer Graphics Metafile CHAP Challenge Handshake Authentication Protocol CHRL Common Hardware R Platform (Power PC) CIDR Classless InterDomain Routing CIE Commission International de l'Eclairage (Paris) CIF Cargo, Insurance & Freight CIGRE Conference Internationale des Grandes Reseaux El‰ctriques (Paris) CIM Computer Integrated Manufacturing CIPM Comit‰ Internationale des Poids et Mesures (Paris) CIR Committed Information Rate CIRC Cross Interleaved Reed-salomon Code CISC Complex Instruction Set Computer CITEL Comision Interamericana de TELecomunicaciones CLNP ConnectionLess Network Protocol (ISO) CLNS Connection Less Network Service (ISO 8473) CMIP Common Management Information Protocol (ISO) CMOS Complementary Metal Oxide Semiconductor CMRR Common Mode Rejection Rate CMYK Cyan Magenta Yellow blacK CNR Carrier to Noise Ratio COBOL COmmon Business Oriented Language CORBA  Common Request Object Broker Architecture COS Corporation of Open Systems (International) CPE Customer Premises Equipment cpi Characters Per Inch cps Characters Per Second CPU Central Processor Unit CR Carriage Return (char 13 - 0DH) CRC Cyclic Redundancy Check CRCC Cyclic Redundancy Check Character CRT Cathode Ray Tube CSA Canadian Standards Association (Rexdale) CSMA/CD Carrier Sense with Multiple Access/Collision Detection (Ethernet IEEE 802.3) CSU Channel Service Unit CT Cordless Telephony CTD Charge Transfer Device CTI Computer-Telephony Integration CTIA Cellular Telecommunications Industry Association CTM Centralized Technical Management CTR Common Technical Requirement (Europe) CTS Clear To Send CW Continuous Wave D D/A Digital to Analog Converter (DAC) DA(S) Distribution Automation (System) DAB Digital Audio Broadcasting DAC Digital to Analog Converter (D/A) DAMA Demand Assigned Multiple Access DAT Digital Audio Tape dB DeciBel dBm DeciBels (relative to 1 mw) DBMS Data Base Management System DBS Direct Broadcast Satellite DBS Direct Broadcast Service DBT Deutsche Bundespost Telekom DC Direct Current DCC Digital Compact Cassette DCE Data Circuit-terminating Equipment DCE Distributed Computing Environment (OSF) DCFL Direct Coupled Field effect transistor Logic DCML Differential Current Mode Logic DCN Data Communications Network DCS Desktop Color Separation DCS Distributed Control System DCS Dynamic Channel Selection DCT Digital Cordless Telephone DCT Discrete Cosine Transform DCTL Direct Coupled Transistor Logic DDCMP  Digital Data Communications Message Protocol (DEC) DDD Direct long Distance Dialing (tel) DDE Dynamic Data Exchange (MS Windows) DDS Digital Data System DDS Digital Data Standard (tapes) DEA Data Encryption Algorithm DECNET Digital Equipment Corporation NETwork DECT Digital European Cordless Telecommunications DES Data Encryption Standard (NBS) DFR Digital Fault (/transient) Recorder DFT Discrete Fourier Transform DFSK Double Frequency Shift Keying DHCP Dynamic Host Configuration Protocol DID Direct Inward Dialing DIMM Dual In line Memory Module DIN Deutsche Industrie Norm (Germany) DIP Dual In-line Package DIU Data Interface Unit DIX Digital Intel Xerox (Ethernet) DIW type D Inside Wire (STP) DLC Data Link Control (sub-layer 2) DLC Digital Loop Carrier DLE Data Link Escape (char 16 - 10H)) DLG Digital Line Graph (vector map files format) DLL Dynamic Link Library (Windows) DLSw Data Link SWitching DM Delta Modulation DMA Direct Memory Access DME Distributed Management Environment DMI Desktop Management Interface DMM Digital MultiMeter DMS Distribution Management System DMTF Desktop Management Task Force DNIC Data Network Identification Code (X-121) DNS Domain Name System (Internet ) DO Diode Outlook DPDT Double-Pole Double-Throw (switch) dpi Dots Per Inch DPSK Differential Phase Shift Keying DQPSK Differential Quaternary Phase Shift Keying DQDB Distributed Queue Dual Bus DRAM Dynamic Random Access Memory DS-3 Digital Signalling level 3 (44.768 Mbps) DS/CDMA Direct Sequence CDMA DS/SS Direct Sequence Spread Spectrum DSI Digital Speech Interpolation DSL Digital Subscriber Line DSM  Demand Side Management DSO Digital Storage Oscilloscope DSP Digital Signal Processing DSS1 Digital Subscriber Signalling System 1 (tel) DSU Data Service Unit DTE Data Terminal Equipment DTL Diode-Transistor Logic DTMF Dual Tone MultiFrequency (signalling) DTP DeskTop Publishing DTR Data Terminal Ready DTU Data Terminal Unit DVD Digital Video (Versatile?) Disc DVI Digital Video Interactive (Intel) DVM Digital Volt Meter DVST Direct View Storage Tube DXF Drawing eXchange file Format DXI Data eXchange Interface E E&M rEceive & transMit (telef, signalling) (Ear & Mouth?) E1 European 1 (2048 bps, 30-channel PCM) EBU European Broadcast Union EBCDIC Extended Binary Coded Decimal Interchange Code (IBM) EC European Commission EC European Community ECB Electronic Code Book (DES) ECG ElectroCardioGram ECL Emitter-Coupled Logic ECM Electronic Counter Measures ECMA European Computer Manufacturers Association (Genˆve) ECU European Currency Unit EDFA Erbium Doped Fiber Amplifier EDH Electronic Data Handling EDI Electronic Data Interchange EDIFACT Electronic Data Interchange For Administration, Commerce and Trade EDO Extended Data Out (memory) EDP Electronic Data Processing EDT Eastern Daylight-saving Time EEPROM Electronically Erasable Programmable Read-Only-Memory EFT Electronic Funds Transfer e.g. Exempli Gratia EGA Enhanced Graphics Adapter EGP Exterior Gateway Protocol EHV Extra High Voltage EIA Electronic Industries Association (Washington) EIRP Effective Isotropic Radiated Power EISA Extended ISA (PC Bus - 32 bits) EL Electro-Luminiscent ELD  Electro-Luminiscent Display EM Electro-Magnetic EMC Electro-Magnetic Compatibility EMF Electro-Motive Force EMI Electro-Magnetic Interference EMP Electro-Magnetic Pulse EMR Electro-Magnetic Radiation EMS Energy Management System EMS Expanded Memory Specification EOF End Of File EOF End Of Frame EOP End Of Packet EOS Electrical OverStress EOT End Of Transmission (char 4 - 04H) EPA Environment Protection Agency EPP Enhanced Parallel Port EPRI Electric Power Research Institute (Palo Alto) EPROM Erasable Programmable Read-Only-Memory EPS Encapsulated Post Script EQ Equipment Qualification E-R Entity-Relationship (diagram) ERC European Radio Commission ERP Effective Radiated Power ESC ESCape (char 027 - 1BH) ESD Electronic Software Distribution ESD ElectroStatic Discharge ESDI Enhanced Small Device Interface ESN Electronic Serial Number ESPRIT European Strategic Program for Research and development of Information Technology EST Eastern Standard Time ETB End of Text Block (char 023 - 17H) ETC Enhanced Throughput Cellular ETSI European Telecommunications Standards Institute (Cedex - F) ETX End of TeXt (char 3 - 03H) EV Electric Vehicle eV Electron Volt (1,602x10-19 J) EVC Enhanced Video Connector (VESA) EXOR EXclusive OR F FAQ Frequently Asked Questions FAT File Allocation Table FAX FAcsimile FBW Fly By Wire FC Fibre Channel FCC Federal Communications Commission (Washington) FCS Frame Check Sequence FD Flexible (Floppy) Disk FDDI  Fiber Distributed Data Interface (ISO 9314) FDM Frequency Division Multiplex FDX Full DupleX FEA Finite Elements Analysis FEC Forward Error Correction FEP Front End Processor FERAM Ferro Electric Random Access Memory FET Field Effect Transistor FEXT Far End cross Talk FFT Fast Fourier Transform FH/SS Frequency Hopping Spread Spectrum FHP Fractional Horse Power (motor) FHT Fast Hartley Transform FIFO First In, First Out FIP Factory Information Protocol FIPS Federal Information Processing Standard FITL Fiber In The Loop FLAG Fiber optic Link Around the Globe FLC Fuzzy Logic Control FLOP FLoating point OPeration FLP FLuorescent Panel FM Frequency Modulation FOB Free On Boards FOIRL Fiber Optic Inter Repeater Link (Ethernet - IEEE 802.3c.3d) FOR Forced Output Rate FORTRAN FORmula TRANslator FOT Fiber Optic Transceiver FP Flat Pack (SMD) FP Function Points FPD Flat Panel Display FPDI Flat Panel Display Interface FPGA Field Programmable Gate Array FPU Floating Point Unit FR Frame Relay FRAD Frame Relay Access Device FSK Frequency Shift Keying FT1 Fractional T1 FTAM File Transfer, Access and Management FTP File Transfer Protocol FTP Foiled Twisted Pair (ScTP) FTTC Fiber To The Curb FTTH Fiber To The Home FTZ Fernmelde Technischen Zentralamt (Darmstadt) FWHM Full-Width at Half Maxima FYI For Your Information G GaAs GAlium ArSenide GaAsP  GAlium ArSenide Phosphide GaN GAllium Nitride GEO Geosynchronous Earth Orbit GIF Graphics Interchange Format GII Global Information Infrastructure GIGO Garbage In, Garbage Out GII Global Information Infrastructure GIS Gas Insulated Switchgear GIS Geographical Information System GKS Graphical Kernel System GMSK Gaussian Minimum Shift Keying GMT Greenwich Meridian Time GND GrouND (0V) GoS Grade Of Service GOSIP Government OSI Profile GPIB General Purpose Instruments Bus (HP-IB, IEEE-488) GPS Global Positioning System GSC Global Standards Collaboration GSM Global Standard for Mobile GSM Groupe Speciale Mobile GTO Gate Turn-Off (thyristor) GUI Graphical User Interface H HBT Heterojunction Bipolar Transistor HD Hard Disk HD High Density HDB High Density Bipolar (code) HDB3 High Density Bipolar 3-level (code) HDD Hard Disk Drive HDF Hierarchical Data Format HDI High Density Interface (connector) HDL Hardware Description Language HDLC High level Data Link Control (IBM, Layer 2) (ISO 4335) HDSL High rate Digital Subscriber Loop (Line?) HDTV High Definition TeleVision HDX Half DupleX HF High Frequency HERF High Energy Radio Frequency HFC Hybrid Fiber/Coaxial network HI Host Interface Hiperlan HIgh PErformance Radio LAN HiPPI HIgh Performance Parallel Interface HLL High Level Logic HLN High Level Network HLS Hue Lightness Saturation (color) HMA High Memory Area HMD Head Mounted Display HMI  Human-Machine Interface HP Horse Power (746 W) HP-IB Hewlett Packard Instrument Bus (GPIB) HP-PCL Hewlett Packard Plotter Control Language HPCC High Performance Computing and Communications HPGL Hewlett Packard Graphic Language HSB Hue Saturation Brightness (color) HSL Hue Saturation Lightness (color) HSSI High Speed Serial Interface HSTP High Speed Transport Protocol HSV Hue Saturation Value (color) HT Horizontal Tab (TAB, char 09 - 09H) HTL High Threshold Logic HTML HyperText Mark-up Language (WWW) HUD Head Up Display HV High Voltage HVAC Heating, Ventilation and Air Conditioning HVC Hue Value Chroma (color) HVDC High Voltage Direct Current I I&A Identification & Authentication IBDN Integrated Building Distribution Network IBOC In Band On Channel IBS Intelsat Business Services IC Integrated Circuit IC Inter-exchange Carrier I-CASE Integrated Computer -Aided Software Engineering ICEA Insulated Cable Engineers Association ICMP Internet Control Message Protocol ICO Intermediate Circular Orbit ICW Interrupted Continuous Wave ID IDentity, IDentifier IDE Integrated Drive Electronics (interface) IDF Intermediate Distribution Frame (tel) IDF Interface Definition Language IDLC Integrated Digital Loop Carrier IDP Internet Data Packet IDRP InterDomain Routing Protocol (ISO) IEC Inter Exchange Carrier IEC International Electrotechnical Comission (Genˆve) IEE Institute of Electrical Engineers (London) IEEE Institute of Electric and Electronics Engineers (NY) IETF Internet Engineering Task Force IF Intermediate Frequency IFL Inter-Facility Link IGBT Insulated Gate Bipolar Transistor IGES Initial Graphics Exchange Standard IGFET  Insulated Gate Field Effect Transistor IGP Interior Gateway Protocol ILD Injection Laser Diode ILS Instrument Landing System IMA Interactive Multimedia Association IMAP Internet Message Access Protocol IMD InterModulation Distortion IMPATT IMPact Avalanche Transit Time IMTS Improved Mobile Telephone System IN Intelligent Network INA Integrated Network Architecture INMARSAT INternational MARitime SATellite INTELSAT INternational TELecommunications SATellite organization I/O Input/Output IP Internetwork Protocol (layer 3) IPng Internet Protocol Next Generation (IETF) IPv6 Internet Protocol Version 6 IPX Internet Packet Exchange (Netware, layer 3) IR InfraRed IRED InfraRed Emitting Diode IRL Inter Repeater Link (Ethernet) IRQ Interrupt ReQuest line (vector) IS Interim Standard (EIA) ISA Industry Standard Architecture (PC bus) ISA  Instrumentation Society of America ISBN International Standard Book Number ISCC Inter-Society Color Council ISDN Integrated Services Data Network IS-IS Intermediate System-Intermediate System routing exchange protocol (layer 3, ISO) ISM Instrumentation, Scientific and Medical (Band) ISO International Standards Organization (Genˆve) ISP Internet Service Provider ISR International Simple Resale ITR Integrated Thyristor / Rectifier ITS90 International Temperature Scale 1990 ITSC International Telecommunications Standards Conference ITU International Telecommunications Union (Genˆve) ITU-R ITU Telecommunications Union - Radio Communications Sector ITU-T ITU Telecommunications Union - Telecommunications Sector ITU-TS ITU Telecommunications Standardization IVA Integrated Voice Application IVDLAN Integrated Voice/Data Local Area Network (IEEE 802.9) IVHS Intelligent Vehicle Highway System J JCL Job Control Language JDC Japan's Digital Communications JEDEC Joint Electron Devices Engineering Council JEIDA Japan Electronic Industry Development Association JIS Japan Industry Standard JIT Just In Time JPEG Joint Photographic Experts Group JTC Joint Technical Committee K KB Knowledge Base (AI) KB KiloBytes kbps Kilo Bits Per Second KWIC KeyWord In Context L LAN Local Area Network LAP Link Access Procedure LAP-B Link Access Procedure, Balanced (Multilink operation procedure, X25) LAP-D Link Access Procedure, D Channel LAP-M Link Access Procedure for Modems LASER Light Amplification by Stimulated Emission of Radiation LAT Local Area Transport (DEC,Ethernet) LATA Local Area Terminal Access (USA) LCD Liquid Crystal Display LD Laser Disc LDF Low Density Foam (cables) LEC Local Exchange Carrier LED Light Emitting Diode LEO Low Earth Orbit LERP Low End Reference Platform LF Line Feed (char 10 -0AH) LIBOR London Inter Bank flOating Rate LIDAR LIght Detection And Ranging LIF Low Insertion Force LIFO Last in, First Out LIM EMS Lotus-Intel-Microsoft Expanded Memory Specification LIP Large Internet Packet LLC Logical Link Control LMI Link Management Interface (Frame Relay) LNA Low Noise Amplifier LNC Low Noise Converter LNM LAN Network Management (IBM) LP Linear Programming LPC Linear Predictive Coding lpi Lines Per Inch LQ Letter Quality LSAP Link layer Service Access Point LSB Least Significant Bit LSI Large Scale Integration LUN Logical Unit Number LUT Look Up Table LZ-78  Lempel & Ziv 1978 (compression) LZW Lempel, Ziv & Welch M MAC Media Access Control (sub-layer 2) MAC Multiplexed Analog Components (TV) MAN Metropolitan Area Networks MAP Manufacturing Automation Protocol MAPs Multiple Access ProtocolS MAS Multiple Address System MASER Microwave Amplification by Stimulated Emission of Radiation MAU Medium Attachment Unit (Ethernet) MBE Molecular Beam Epitaxy MBone Multicast backBONE (Internet) MC Micro Channel (IBM) MCA Micro Channel Architecture (IBM) MCGA MultiColor Graphics Array MCM Multi Chip Module MCPC Multiple Channel Per Carrier MD Mini Disk MDA Monochrome Display Adapter MDF Main Distribution Frame (tel) MDI Medium Dependent Interface MEMS Micro Electro Mechanical Systems MEO Medium Earth Orbit MESFET MEtal Semiconductor Field Effect Transistor MFLOPS Million of FLoating point OPerationS MFM Modified Frequency Modulation MHS Message Handling Services MIB Management Information Base MIC Media Interface Connector MIC Monolithic Integrated Circuit MICR Magnetic Ink Character Recognition MIDI Musical Instruments Digital Interface MIF Management Information File MIL MILitary standard (USA) MILSPEC MILitary SPECification (USA) MIME Multipurpose Internet Mail Extensions MIPS Millions of Instructions Per Second MIS Management Information System MIT Massachusetts Institute of Technology (USA) MITI Ministry of International Trade and Industry (Japan) MJTC MultiJunction Thermal Converter MKSA Meter Kilogram Second Ampere (SI) MMI Man Machine Interface MMIC Monolithic Microwave Integrated Circuit MMW MilliMeter Waves MNOS Metal Nitride Oxide Semiconductor MNP  Microcom Networking Protocol MO Magneto Optical (disk) MO/CD-R Magneto Optics Compact Disc Rewriteable Modem MOdulator-DEModulator MOS Metal-Oxide Silicon/Semiconductor MOSFET Metal-Oxide Silicon Field Effect Transistor MOV Metal-Oxide Varistor MPC Multimedia Personal Computer MPEG Motion Picture Experts Group MPGA Mask Programmable Gate Array MPP Massively Parallel Processing MPS Message Passing System MPU Micro Processor Unit MS Master Station MSB Most Significant Bit MS-DOS MicroSoft Disk Operating System MSI Medium Scale Integration MSK Minimum Shift Keying MSS Mobile Satellite Service MTA Message Transfer Agent MTBF Mean Time Between Failures MTS Mobile Telephone System MTTR Mean Time To Repair MUX MUltipleXor MV Medium Voltage MVS Multiple Virtual Storage (IBM) MW Mega Watt MW Micro Wave MXI Multisystem eXtension Interface (bus) N N/A Not Applicable NA Numeric Aperture NAU Network Access Point NAU Network Addressable Unit NBS National Bureau of Standards œ(NIST) NC Network Congestion (No Connection) NC Numeric Control NCC Network Control Center NCGA National Computer Graphics Association NCP Network Control Protocol (IBM) NCS National Communications System (USA) NEC National Electric Code (USA) NEMA National Electric Manufacturers Association (USA) NEP Noise Equivalent Power NESC National Electric Safety Code (USA) NET Normes Europ‰ennes de T‰l‰communications NEXT Near-End Cross Talk NF  Noise Figure NFS Network File Services NIC Network Information Center (Internet) NIC Network Interface Card NiCad NIckel CADmium (battery) NII National Information Infrastructure NiMH NIckel Metal Hydride (battery) NIST National Institute of Standards & Technology NIU Network Interface Unit NLM Network Loadable Module (Netware) NMF Network Management Forum NMOS Negative Metal Oxide Silicon NMR(I) Nuclear Magnetic Resonance (Imaging) NMRR Normal Mode Rejection Rate NMS Network Management System NMT Nordic Mobile Telephone NNI Network Node Interface NOC Network Operating Center NPN Negative-Positive-Negative NPR Non Polarized Radial NRAM Non Volatile RAM NRZ Non Return to Zero NRZI Non Return to Zero Inverted NSAP Network Service Access Point NSF National Science Foundation NSFNet National Science Foundation NET NTC Negative Temperature Coefficient NTSC North american Television Standards Committee NVP Nominal Velocity of Propagation NVRAM Non-Volatile RAM O OA&M Operations, Administration & Maintenance OBP Open Bridging Protocol OC-1 Optical Carrier level 1 (51.84 Mbps) OCR Optical Character Recognition OCWR Optical Continuos Wave Reflectometer OD Outside Diameter ODA Office Document Architecture (ISO 8613) ODBC Open Data Base Connectivity ODI Open Data-Link Interface (Netware) ODIF Office Document Interchange Format (ISO 8613) OEIC OptoElectronic Integrated Circuit OEM Original End-product Manufacturer OIG OSPF Interoperability Group OLTP On Line Transaction Processing OLE Object Linking and Embedding OMG Object Management Group OMT  Ortho Mode Transducer (satellite) ONU Optical Network Unit OODB Object Oriented Data Base OOP Object Oriented Programming OpAmp OPerational AMPlifier OPGW overhead OPtical Ground Wave OPI Open Prepress Interface OQPSK Offset Quad Phone Shift Keying ORB Object Request Brokers ORL Optical Return Loss OS Operating System OSF Open Software Foundation OSI Open Systems Interconnection (ISO 7498) OSPF Open Shortest Path First OSS One-Stop Shopping OTDR Optical Time Domain Reflectometer P PABX Private Automatic Branch eXchange PACS Personal Access Communications Services/System PAD Packet Assembler Disassembler (X.3,X.25) PAL Phase Alternating Line (TV) PAL Programmable Array Logic PAM Pulse Amplitude Modulation PAMR Public Access Mobile Radio (SMR) PAP Password Authentication Protocol PAX Private Automatic eXchange PBA Printed Board Assembly PBX Private Branch eXchange PC Personal Computer PC Program Counter PCB Printed Circuit Board PCCA Portable Computer and Communications Association PCI Protocol Control Information PCI Peripheral Components Interconnect (bus) PCM Pulse Code Modulation PCMCIA Personal Computer Memory Card International Association PCN Personal Communications Network (Europe) PCS Personal Communications Services (USA) PCSN Private Circuit Switching Network PDA Personal Digital Assistant PDC Personal Digital Cellular (Japan) PDF Portable Document Format PDFA Praseodymium Doped Fiber Amplifier PDH Plesiochronic Digital Hierarchy PDMA Polarization Division Multiple Access PDN Public Data Network PDS Processor Direct Slot PE  PolyEthylene PECC Partially Error Controlled Connections PERL Practical Extraction and Report Language PERM Pre-Embossed Rigid Magnetic PERT Program Evaluation and Review Technique PET Positron Emission Tomography PHIGS Programmer's Hierarchical Interactive Graphics System PHS Personal Handy phone System (Japan) PIA Programmable Interface Adapter PICS Platform for Internet Content Selection PID Proportional Integral Differential PIKS Programmer's Imaging Kernel System PIN Personal Identification Number PIN Positive Intrinsic Negative (Diode) PING Packet INternet Grouper (RFC-792) PIV Peak Inverse Voltage PKC Public Key Criptosystem PL/1 Programming Language (version) 1 PLA Programmable Logic Array PLC Power Line Carrier PLC Programmable Logic Controller PLCC Plastic Leadless Chip Carrier PLD Programmable Logic Device PMPO Peak Music Power Output PMOS Positive Metal Oxide Silicon PMR Public/Private (?) Mobile Radio PMU Phasor Measurement Unit PNNI Private Network to Network Interface PNP Positive-Negative-Positive PON Passive Optical Network POP Point Of Presence POP Post Office Protocol (RFC 1125) POS Point of Sale POSIX Portable Operating System Interface (IEEE) POTS Plain Old Telephone Service PPD Postscript Printer Description ppm Parts Per Million PPP Point to Point Protocol PPS Packets Per Second PQFP Plastic Quad Flat Pack PRA Primary Rate Access (2Mb/s - ISDN) PRI Primary Rate Interface (ISDN) PROM Programmable Read-Only Memory PS Post Script PSDN Packet Switched Data Network PSI Packet Switched Interface (DEC) PSI Peripheral System Interconnect psi  Pounds per Square Inch PSK Phase Shift Keying psRAM Pseudo Static Random Access Memory PSTN Public Switched Telephone Network PSW Processor Status Word PTB Phisikalisch-Technische Bundesanstalt (Braunschweig) PTC Positive Temperature Coefficient PTM Packet Transfer Mode PTM Pulse Time Modulation PTP Peak To Peak (voltage) PTT Post, Telegraph and Telephone PU Per Unit PV Photo Voltaic PVC Permanent Virtual Circuit/Connection PVC Poly Vinyl Chloride PVQ Pyramid Vector Quantization (codification) PWM Pulsed Wave Modulation PWM Pulse-Width Modulation Q QA Quality Assurance QAM Quadrature Amplitude Modulation QBE Query By Example QC Quality Control QFP Quad Flat Pack QHE Quantum Hall Effect QoS Quality Of Service QPSK Quadrature/Quaternary Phase Shift Keying QWIP Quantum-Well Infrared Photo detector R R&D Research and Development RACE Research & development for Advanced Communications in Europe RAD Rapid Application Development RADAR RAdio Detection And Ranging RAID Redundant Array of Inexpensive Disks RAM Random Access Memory RARP Reverse Address Resolution Protocol RBOC Regional Bell Operating Company (USA) RCA Radio Corporation of America RCL Resistance, Capacitance and inductance(L) RDAC Remote Data Acquisition and Control RDBMS Relational Data Base Management System RELP Residually Excited Linear Predictive RETMA Radio Electronics Television Manufacturers Association RF Radio Frequency RFC Request For Comment (Internet) RFI Radio Frequency Interference RG Radio Guide (Hw catalog) RGB  Red Green Blue RIP Raster Image Processor RIP Router Information Protocol RISC Reduced Instruction Set Computer RJE Remote Job Entry (IBM) RLAP Radio data Link Adapter Protocol RLL Radio Local Loop RLL Relay Ladder Logic RLL Run-Length Limited (code) RMA Return Merchandise Authorization RMON Remote MONitoring RMS Root Mean Square ROI Return On Investment ROM Read-Only Memory RPC Remote Procedure Call RPG Report Program Generator rpm Revolutions Per Minute RS Recommended Standard (EIA) RS Remote Station RS Reed Salomon (code) RSA Rivest Shamir & Adleman (encryption) RSIs Repetitive Stress InjurieS RSVP resource ReSerVation Protocol RSVP R‰pondez S'il Vous Plait RT Room Temperature RTC Real Time Clock RTD Resistive Temperature Detector RTF Rich Text Format RTOS Real Time Operating System RTS Request To Send RTT Round Trip Time RTU Remote Telemetry Unit R/W Right of Way RWM Read-Write Memory RX Reception RXD Received Data S S&H Shipping & Handling SA Service Availability (tel) SAL SQL-windows Application Language SAM Sequential Access Memory SAP Service Access Point SAP Services Advertising Protocol (Netware) SAR Synthetic Aperture Radar SAT Site Acceptance tests SARM Set Asynchronous Response Mode (HDLC) SAW Surface Acoustic Wave SBC  Single Board Computer SBO Select-Before-Operation (SCADA) SCADA Supervisory Control And Data Acquisition SCI Scalable Coherent Interface (IEEE 1596 - 1 Gbit/s) SCPC Single Channel Per Carrier (Satellite) SCPI Standard Commands for Programmable Instruments SCR Silicon Controlled Rectifier SCS Silicon Controlled Switch SCSI Small Computer System Interface ScTP SCreened Twisted Pair (FTP) SDF System Data Format SDH Synchronous Digital Hierarchy SDLC Synchronous Data Link Control SDMA Space Division Multiple Access SDSL Symmetric Digital Subscriber Line SDU Service Data Unit SEAL Simple and Efficient Adaptation Layer (AAL5 - ATM) SECAM SEquentiel Couleur Avec Memoire (TV) SER Sequence of Events Recording SFTP Shielded Foil Twisted Pair SGML Standard Generalized Mark-up Language SHN Self-Healing Networks SI Systˆme International SIA Satellite Industry Association SIC Silicon Carbide SIDF System Independent Data Format SIMM Single In-line Memory Module SINAD SIgnal, Noise And Distortion SIP Single In-line Package SIS Superconductor-Insulator-Superconductor SIS Standardiseiringskommissionen I Sverige (Stockholm) SJTC Single-Junction Thermal Converter SLED Single Large Expensive Disk (RAID) SLIP Serial Line Internet Protocol SM Single Mode (fiber) SM Surface-Mount SMA SubMiniature A connector (RF-FO) SMD Surface-Mounted Device SMDL Standard Music Description Language SMDS Switched Multimegabit Data Service SMF Single Mode Fiber SMPTE Society of Motion Pictures and Television Engineers SMR Specialized Mobile Radio SMT Surface Mount Technology SMTP Simple Message Transfer Protocol (Internet - RFC 822) SNA System Network Architecture (IBM) SNAP Sub-Network Access Protocol SNI  Standard Network Interface SNMP Simple Network Management Protocol SNR Signal to Noise Ratio (S/N) SNRM Set Normal Response Mode (HDLC) SOE Sequence Of Events (recording) SOH Start Of Header (char 01 - 01H) SOHO Small Office - Home Office SOIC Small-Outline Integrated Circuit (SMD) SOJ Small-Outline J-lead (SMD) SOL Small-Outline Leaded (SMD) SONET Synchronous Optical NETwork SOS Silicon-On-Sapphire SPC Stored Program Control Spec SPECification SPEC Standard Performance Evaluation Corporation SPST Single Pole Single Throw (switch) SPX Sequenced Packet Exchange (layer 4, Netware) SQE Signal Quality Error (Heartbeat) (Ethernet) SQID Super conductive Quantum Interference Device SQL Structured Query Language SRAM Static Random Access Memory SRP Suggested Retailer's Price SRT Source Route Transport (Token Ring) SRP Source Routing Protocol SS Spread Spectrum SS7/CCS Signalling System 7 / Common Channel Signalling (tel) SSB Single Side Band SSR Solid State Relay SST Spread Spectrum Technology Std STanDard STB Set Top Box (TV) STN Super Twisted Nematic (LCD) STP Shielded Twisted Pair STP Spanning Tree Protocol (IEEE) STX Start of TeXt (char 02 - 02H) SVCs Switched Virtual Circuit SVD Simultaneous Voice and Data SVID System V Interface Definition (Unix) SVP Surge Voltage Protector SWC Surge Withstand Capability SWEDAC SWEDish board for technical ACcreditation SWIFT Society for World-wide Inter-bank Financial Telecommunications SWR Standing Wave Ratio T T1 Trunk 1 (1544 bps, 24-channel PCM) T3 Trunk 3 (44.736 Mb/s) TAB Tape Automated Bonding TACS  Total Access Communications System TAPI Telephone Application Program Interface TCC Telephone Country Code TCM Trellis Coded Modulation TCP Tape Carrier Package TCP Transmission Control Protocol (layer 4) TCP/IP Transmission Control Protocol/Internet Protocol TDM Time Division Multiplex TDMA Time Division Multiple Access TDR Time Domain Reflectometry TE Transverse Electric TEM Transverse Electro Magnetic TFE TetraFluoro Etilene (Teflon) TFT Thin Film Transistor TFTP Trivial File Transfer Protocol THD Total Harmonic Distortion THF Tremendously High Frequency TIA Telecommunications Industries Association TIFF Tag Image File Format TM Transverse Magnetic T&M Test and Measurement TMN Total/Telecommunications Management Network (ITU-TS M.3010) TNC Threaded Normalized Connector TO Transistor Outlook TOP Technical and Office Protocol (LAN) TPC Transaction Performance Council TPF Transaction Processing Facility (IBM) tpi Tracks Per Inch TQC Total Quality Control TQM Total Quality Management TSOP Thin Small Outline Package (SMD) TSR Terminate and Stay Resident (DOS) TTL Transistor-Transistor Logic TTX TeleTeXt TTY TeleTYpe T›V Technische ›berwachungs Verein (Germany) TVC Thermal Voltage Converter TWT Traveling Wave Tube TX Telex TX Transmission TXD Transmitted Data TXT TeXT U UART Universal Asynchronous Receiver - Transmitter UDP User Datagram Protocol (layer 4) UHF Ultra High Frequency (300-3000 MHz) UIT Union Internationale des T‰l‰communications (ITU - Genˆve) UJT  UniJunction Transistor UL Underwriters Laboratories (USA) ULS User Location Service UMTS Universal Mobile Telecommunications System UNI User to Network Interface UPC Universal Product Code (bar code) UPS Uninterruptible Power Supply UPS United Parcel Service (USA) UPT Universal Personal Telecommunications URL Universal Resource Locator (Internet) USAT Ultra-Small Aperture Terminal USB Universal Serial Bus (Intel) USD United States' Dollar USDC United States' Digital Communications UT Universal Time UTC Universal Time Coordinated UTE Union Technique de l'Electricit‰ (Paris) UTP Unshielded Twisted Pair (Ethernet) UUCP Unix to Unix Copy Protocol UV UltraViolet V VAN Value-Added Network VAR Value Added Reseller VAR Volt-Ampere Reactive VAX Virtual Memory eXtension (DEC) VBR Variable Bit Rate VC Virtual Circuit VCA Voltage Controlled Amplifier VCI Virtual Channel Identifier (ATM) VCO Voltage Controlled Oscillator VCR Video Cassette Recorder VDE Verband Deutscher Elektrotechniker (Germany) VDR Voltage Dependent Resistor VDSL Very-high-rate Digital Subscriber Line VDT Video Display Terminal VDU Video Display Unit VESA Video Electronics Standards Association VF Voice Frequency VGA Video Graphics Adapter VHDL VHSIC Hardware Description Language VHF Very High Frequency (30-300 MHz) VHS Video Home System VHS-C Video Home System Compact VHSIC Very High Scale Integrated Circuit VI Virtual Instrument VIA Versatile Interface Adapter VINES VIrtual NEtwork Software (Banyan) VLB  VESA Local Bus (VL bus) VL bus VESA Local BUS (VLB) VLIW Very Long Instruction Word VLSI Very Large Scale Integration VLM Virtual Loadable Module (Netware) VMEbus Versa Module Eurocard BUS (IEEE 1014) VMS Virtual Memory System (DEC) VMS Voice Message System VOD Video On Demand VOR Vhf Omnidirectional Range VOX Voice Operated relay VP Virtual Path VPI Virtual Path Identifier (ATM) VPN Virtual Private Network VR Virtual Reality VR Voltage Regulator VRAM Video Random Access Memory VRC Vertical Redundancy Check (parity) VRMS Volts Root Mean Square VSAT Very Small Aperture Terminal VSB Vestigial Side Band VSELP Vector Sample/Sum Excited Linear Prediction (code-Motorola) VT Video Terminal (DEC) VT Virtual Terminal VTR Video Tape Recorder VU Volume Unit (tel) VXI Vmebus eXtensions for Instrumentation W W3 World Wide Web (WWW) W3C World Wide Web Consortium WACS Wireless Access Communications System WAN Wide Area Networks WAN Wide Area Information Service WARC World Administrative Radio Conference WLL Wireless in the Local Loop WDM Wave Division Multiplexing WEC World Energy Council WMF Windows Meta File wpm Words Per Minute WORM Write Once, Read Many WRU Who aRe yoU WWAN Wireless Wide Area Networks WWN World Wide Net WWW World Wide Web WYSIWYG What You See Is What You Get X XLPE cross Linked PolyEthylene XMS  eXtended Memory Specification (>1024kB) XNS Xerox Network Specification XOR eXclusive OR XTP eXpress Transfer Protocol XYZ color description (CIE) Y YIQ Y(luminance) Intensity Q(crominance) (color NTSC) YAG Yttrium Aluminum Garnet Z ZD Zero Defects ZIF Zero Insertion Force DAICI (Diccionario de Acronimos en Ingenieria, Comunicaciones e Informatica) by Juan Carlos Miguez Last modified: 1997-01-30