Acronimi ed abbreviazioni nelle Telecomunicazioni
Acronimi ed abbreviazioni nelle Telecomunicazioni
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Acronimi ed abbreviazioni nelle Telecomunicazioni
Cosa significa cosa vuol dire ?
| 3G | Third generation mobile Services |
| 3GPP | Third generation Partnership Project |
| A3 | GSM authentication algorithm |
| A5 | GSM stream cipher algorithm (GSM) |
| A8 | SM cipher key generating algorithm (GSM) |
| A-bis | BSC-BTS interface |
| AAC | Automatic Amplitude Control |
| AACS | Asynchronous Address Communications System |
| AAL | ATM Adaptation Layer |
| AAR | Automatic Alternate Routing |
| AAS | Adaptive Antenna System |
| AAV | Alternate Access Vendors |
| ABC | Advanced Broadband Communications |
| ABM | Asynchronous Balanced Mode (HDLC) |
| ABR | Available Bit Rate (ATM) |
| ABS | Alternate Billing Service |
| ABSE | Absolute Error |
| AC | Access Control (Token Ring, FDDI) |
| AC | Authentication Centre |
| ACCH | Associated Control Channel |
| ACD | Automatic Call Distribution |
| ACE | Advanced Communications Experiments |
| ACE | Automatic Cross-connection Equipment (also |
| known as AXE) | |
| ACF | Advanced Communication Function |
| ACID | Automated Classification and Interpretation Data |
| ACITS | Advisory Committee on Information Technology |
| Standardisation (SOG-IT) | |
| ACOS | Automatic Coding System |
| ACS | Automatic Control System |
| ACTE | Approvals Committee for Terminal Equipment |
| ACTOM | Advisory Committee on Technical and Operational |
| Matters (of Inmarsat) | |
| ACTS | Advanced Communications Technologies and |
| Services | |
| ACU | Antenna Coupling Unit |
| ADA | Automatic Data Acquisition |
| ADAPTCOM | Adaptive Communication |
| ADAS | Automatic Data Analysis System |
| ADC | Analog-to-Digital Converter |
| ADC | Access Deficit Contribution |
| ADCCP | Advanced Data Communications Control |
| Procedures (ANSI) | |
| ADCT | Adaptive Discrete Cosine Transform Coding (video |
| coding) | |
| ADES | Automatic Digital Encoding System |
| ADF | Automatic Direction Finder |
| ADLNB | Association of Designated Laboratories & Notified |
| Bodies | |
| ADM | Adaptive Delta Modulation |
| ADP | Automatic Data Processing |
| ADPCM | Adaptive Differential Pulse Code Modulation |
| ADPE | Automatic Data Processing Equipment |
| ADPP | Automatic Data Processing Program |
| ADPS | Automatic Data Processing System |
| ADR | Airborne Digital Recorder |
| ADSL | Asymmetric Digital Subscriber Line |
| ADSM | Asynchronous Delta Sigma Modulation |
| ADT | Automatic Digital Tracking |
| ADTI | Automatic Data and Time Indication |
| ADTS | Automatic Data Test System |
| AECMA | Association Européenne des Constructeurs de |
| Matériel Aerospatial (European Association for the | |
| Construction of Aero-Space Equipment) | |
| AECS | Aeronautical Emergency Communications System |
| AENOR | Associación Española de Normalización (Standards |
| Association, Spain) | |
| AER | Antenna Effective Resistance |
| AEROSAT | Aeronautical Satellite System |
| AES | Aeronautical Earth Station |
| AEW | Airborne Early Warning |
| AFA | Audio Frequency Amplifier |
| AFB | Assigned Frequency Band |
| AFC | Amplitude Frequency Characteristic |
| AFC | Automatic Frequency Control |
| AFD | Amplitude-Frequency Distortion |
| AFM | Amplitude-Frequency Modulation |
| AFMES | Automatic Frequency Modulation Eliminating |
| System | |
| AFNOR | Association Française de Normalisation (Standards |
| Association, France) | |
| AFS | Aeronautical Fixed Service |
| AFSK | Audio Frequency Shift Keying |
| AFUTT | Association Française des Utilisateurs de Téléphone |
| et des Télécommunications (French Telegraphs and | |
| Telephone Users’ Association) | |
| AGC | Automatic Gain Control |
| AGPOS | Automatic General Purpose Orbital Satellite |
| AGS | Automatic Gain Stabilization |
| AHS | Antenna Homing System |
| AIN | Advanced Intelligent Network |
| AIP | Advanced Infrastructure Planning or Advanced |
| Information Processing | |
| AIS | Alarm Indication Signal |
| AITS | Acknowledged Information Transfer Service |
| (ITU-T) | |
| AM | Amplitude Modulation |
| AMDSB | Amplitude Modulation Double Sideband |
| AMPS | Advanced Mobile Phone System |
| AMSL | Above Mean Sea Level |
| AMSS | Aeronautical Mobile Satellite Service |
| AMU | Antenna Matching Unit |
| ANBFM | Adaptive Narrow-Band FM Modem |
| ANI | Automatic Number Identification (ISDN) |
| ANL | Automatic Noise Limiter |
| ANR | Automatic Network Routing |
| ANRAC | Aids to Navigation Radio Control |
| ANRS | Automatic Noise Reduction System |
| ANSI | American National Standards Institute |
| AOA | Angle Of Arrival |
| AOC | Advice of Charge |
| AP | Access Point (UPT) |
| APAT | IMTC Application Programming Activity Group |
| APD | Amplitude Probability Distribution |
| APDU | Application Protocol Data Unit |
| APF | Accurate Position Finder |
| APFC | Automatic Phase and Frequency Control |
| API | Application Programming Interface |
| APL | Analogue Private Line |
| APON | ATM Passive Optical Network |
| APP | Applications Portability Profile |
| APS | Automatic Protection Switching |
| APSK | Amplitude Phase Shift Keying |
| APU | Auxiliary Power Unit |
| AQPSK | Adaptive Quadrature Phase Shift Keying |
| ARB | Aeronautical Radar Beacon |
| ARC | Automatic Remote Control |
| ARM | Asynchronous Response Mode (HDLC) |
| ARNS | Aeronautical Radio Navigation Service |
| ARP | Antenna Radiation Pattern |
| ART | Automatic Range Tracking |
| ART | Autorité de Régulation des Télécommunications |
| (French Approval Authority) | |
| AS | Aeronautical Station |
| AS | Anti Spooling |
| ASA | Automatic Spectrum Analyzer |
| ASB | Asymmetrical Sideband |
| ASC | Automatic Sensitivity Control |
| ASCII | American Standard Code for Information |
| Interchange | |
| ASE | Averaged Square Error |
| ASIC | Application Specific Integrated Circuit |
| ASK | Amplitude Shift Keying |
| ASN | ATM Switching Network |
| ASP | Advanced Speech Processor |
| ASR | Answer Seize Ratio |
| ASR | Automatic Send-Receive Set |
| ASRS | Airborne Satellite Receiving Station |
| ASS | Amateur-Satellite Service |
| ASU | Acquisition and Synchronization Unit |
| ASVD | Analogue Simultaneous Voice and Data |
| AT | Assistive Technology |
| AT&T | American Telephone and Telegraph Corporation |
| ATDM | Asynchronous Time Division Multiplexing |
| ATDMA | Advanced Time Division Multiple Access |
| ATH | ATM Transmission Hierarchy |
| ATIS | Automatic Transmitter Identification System |
| ATM | Asynchronous Transfer Mode |
| ATR | Automatic Transmitter |
| ATRA | Austrian Telecommunications Regulation Authority |
| ATS | Air Traffic Services |
| ATS | ATM Transmission System |
| ATU | Central or Remote: ADSL Transmission Unit |
| AU | Adaptation Unit |
| AUC | Authentication Centre |
| AUI | Attachment Unit Interface |
| AUP | Acceptable Use Policy |
| AWSW | Antenna Waveguide Switch |
| AXE | Automatic Cross-Connection Equipment (also |
| known as ACE) | |
| AZ | Azimuth |
| AZS | Automatic Zero Set |
| B-CDMA | Broadband Code Division Multiple Access |
| B-ICI | Broadband Intercarrier Interface (ATM) |
| B-ISDN | Broadband ISDN |
| B-LE | Broadband Local Exchange (B-ISDN) |
| B-TA | Broadband Terminal Adapter (B-ISDN) |
| B-TE | Broadband Terminal Equipment (B-ISDN) |
| BA | Balanced Asynchronous (HDLC) |
| BABS | Beam Approach Beacon System |
| BABT | British Approvals Board for Telecommunications |
| BACP | Bandwidth Allocation Control Protocol (PPP,ISDN) |
| BACT | Advisory Committee on Telecommunications for |
| Small Businesses (UK) | |
| BAIC | Barring of All Incoming Calls |
| BAKOM | Bundesamt für Kommunikation or Federal Office |
| for Communication (Switzerland) | |
| BAOC | Barring of All Outgoing Calls |
| BAP | Bandwidth Allocation Protocol |
| BBS | Bulletin Board Service |
| BBSK | Binary Phase Shift Keying |
| BCCH | Broadcast Control Channel |
| BCF | Budget Cross-flow Model |
| BCFSK | Binary Code Frequency Shift Keying |
| BCI | Broadcast Interference |
| BCLB | Broadband Connectionless Bearer Service (ATM) |
| BCN | Beacon |
| BCN | Broadband Communication Network |
| BCOB | Broadband Connection-Oriented Bearer Service |
| (ATM) | |
| BCPN | Business Customer Premises Network |
| BCS | Broadcast Communication System |
| BDI | Bearing Deviation Indicator |
| BDT | Telecommunication Development Bureau of the ITU |
| BEF | Band Elimination Filter |
| BER | Bit Error Rate |
| BER(T) | Bit Error Rate (Test) |
| BERKOM | Berliner Kommunikation (German optical network) |
| BEVR | Broadcast Electronic Video |
| BF | Binary Function |
| BFO | Beat Frequency Oscillator |
| BFSK | Binary Frequency Shift Keying |
| BIPT | Belgian Institute for Posts and Telecommunications |
| BLO | Blocking Signal |
| BNS | Broadband Network Service |
| BP | Band Pass |
| BPM | Bi-phase Manipulation |
| BPS | Beacon Portable Set |
| BPS | Bits per Second |
| BPSK | Binary Phase Shifting Key |
| BRF | Band Rejection Filter |
| BRI | Basic Rate Interface (ISDN) |
| BRITE | Basic Rate Interface Transmission Equipment |
| BRLU | Broadband Remote Line Unit |
| BS | Base Station |
| BS | Broadcasting Satellite |
| BSC | Base Station Controller |
| BSE | Broadcasting Satellite for Experimental Purposes |
| BSI | British Standards Institute |
| BSIC | Base Transceiver Station Identity Code |
| BSS | Base Station System |
| BSS | Basic Synchronised Subset |
| BSS | Broadband Switching System |
| BSSMAP | Base Station Systems Management Application Part |
| BT | Burst Tolerance (ATM) |
| BT | Business Telecommunications (as used by ETSI) or |
| British Telecom | |
| BTNR | British Telecom Network Requirement |
| BTR | British Telecom Requirement |
| BTS | Base Transceiver Station |
| BTS | Base Transceiver Station Terminal |
| BTS | Broadcast Transmission System |
| BW | Band Width or Beam Width |
| C-BAT | Cost-Benefit Analysis Toolkit |
| C-Net | Analogue cellular system standard |
| CAA | Civil Aviation Authority |
| CABS | Carrier Access Billing System |
| CAC | Carrier Access Code |
| CAC | Connection Admission Control (ATM) |
| CADL | Communication and Data Link |
| CAE | Computer-Aided Engineering |
| CAGC | Coded Automatic Gain Control |
| CAI | Common Air Interface |
| CAL | Calibration |
| CAMEL | Customised Applications for Mobile Network |
| Enhanced Logic | |
| CAN | Cosmopolitan Area Network |
| CAP | CAMEL Application Protocol |
| CAP | Carrierless Amplitude/Phase modulation |
| CAP | Competitive Access Provider |
| CAPI | Common ISDN API |
| CAS | Channel Associated Signalling |
| CAS | Cordless Access Service |
| CATscan | Computed Axial Tomodensitometry Scanner |
| CAU | Controlled Access Unit (Token Ring) |
| CB | Cell Broadcast |
| CB | Channel Bank |
| CBC | Commission of the European Community |
| CBDS | Connectionless Broadband Data Service (ETSI) |
| CBI | Cross-Border Interconnect |
| CBR | Constant Bit Rate (ATM) |
| CBRA | Constant Bit-Rate Adapter |
| CBS | Common Base Station |
| CBX | Computerised Branch Exchange |
| CC | Country Code |
| CC | Cross Correlation |
| CC | Cross-Connect |
| CCA | CENELEC Certification Agreement |
| CCBS | Completion to Busy Subscriber |
| CCC | CENELEC Electronic Components Certification |
| CCCH | Common Control Channel |
| CCF | Call Control Function |
| CCF | Cross Correlation Function |
| CCH | Connections per Circuit per Hour |
| CCIR | Comité Consultatif International des |
| Radiocommunications (Consultative Committee on | |
| International Radiocommunications) International | |
| Body | |
| CCITT | Comité Consultatif International Télégraphique et |
| Téléphonique (Consultative Committee on | |
| International Telegraphy and Telephony) | |
| International body | |
| CCS | Common Channel Signalling |
| CCSS7 | Common Channel Signalling System Number 7 |
| CCU | Central Control Unit |
| CD | Call Deflection |
| CD | Collision Detection (LAN) |
| CDAA | Circularly Disposed Antenna Arrays |
| CDAS | Command and Data Acquisition Station |
| CDC | Control Data Corporation |
| CDM | Code Division Multiplexing |
| CDM | Continuous Delta Modulation |
| CDMA | Code Division Multiple Access |
| CDPD | Cellular Digital Packet Data |
| CDR | Call Detail Record |
| CE | Conformity European |
| CEB | Comité Electrotechnique Belge (Electrotechnical |
| Commitee, Belgium) | |
| CEC | Commission of the European Community (ies) |
| CEI | Comitato Elettrotecnico Italiano (Electrotechnical |
| Committee, Italy) | |
| CEIR | Central Equipment Identity Register |
| CELEX | EC Legislation database in Eurobases databank |
| CEN | Comité Européen de Normalisation (European |
| Standards Committee) | |
| CENELEC | Comité Européen de Normalisation Electrotechnique |
| (European Electrotechnical Standards Committee) | |
| CEPT | Conférence des Administrations Européenes des |
| Postes et Télécommunications (European | |
| Conference of Posts and Telecommunications | |
| Administrations) | |
| CERN | Centre Européen pour la Recherche Nucléaire |
| CES | Central Earth Station |
| CES | Coast Earth Station |
| CESI | Centro Elettrotecnico Sperimentale Italiano (Italy) |
| CF | Carrier Frequency |
| CF | Constant Frequency |
| CFB | Call Forward Busy |
| CFM | Center Frequency Modulation |
| CFNR | Call Forward No Reply |
| CFR | Code of Federal Regulations |
| CFS | Carrier Frequency Shift |
| CFS | Common Functional Specifications |
| CGSA | Cellular Geographical Service Area |
| CI | Cell Identity |
| CI | Computer Interconnect |
| CIC | Carrier Identification Code |
| CICS | Customer Information Control System |
| CID | Caller Identification |
| CIF | Common Intermediate Format |
| CIGREF | Club Informatique des Grandes Entreprises |
| Françaises | |
| CILE | Call Information Logging Equipment |
| CIM | Coded Impulse Modulation |
| CIM | Computer Integrated Manufacturing |
| CIR | Channel Impulse Response |
| CISPR | International Special Committee on Radio |
| Interference | |
| CIX | Commercial Internet Exchange |
| CLASS | Custom Local Area Signalling Services |
| CLI | Calling Line Identity/Identification |
| CLID | Calling Line Identification (ISDN, CLASS) |
| CLIP | Calling Line Identity Presentation |
| CLIR | Calling Line Identification Restriction |
| CLNP | Connectionless Network Protocol (ISO, ITU-T) |
| CLR | Cell Loss Ratio |
| CLTS | Connectionless-mode Transport Service |
| CM | Communications Management |
| CMC | Coherent Multi Channel (optical transmission) |
| CMIP | Common Management Information Protocol |
| CMIS | Common Management Information Service |
| CMR | Cellular Mobile Radio |
| CMRS | Cellular Mobile Radio Telecommunications Service |
| CNAE | Customer Network Access Equipment |
| CNM | Customer Network Management |
| CNR | Carrier to Noise Ratio |
| CNS | Complementary Network Service |
| CoC | Certificate of Conformance |
| CODEC | Coder/Decoder |
| CODIT | Code Division Test Bed. |
| COFDM | Coding Orthogonal Frequency Division Multiplex |
| COLP | Connected Line Identification Presentation |
| COLR | Connected Line Identification Restriction |
| COMSAT | Communications Satellite Corporation |
| CONELRAD | Control of Electromagnetic Radiation |
| CoP | Code of Practice |
| COS | Characteristic Orbital Spacing |
| COSINE | Cooperation for Open Systems Interconnection |
| Networking in Europe | |
| COST | European Cooperation in the field of Scientific and |
| Technical Research | |
| CPAF | Customer Premise Access Facility |
| CPB | Cell Priority Bit |
| CPE | Customer Premise Equipment |
| CPN | Customer Premises Network |
| CPPW | Circularly Polarized Plane Wave |
| CPS | Carrier Pre-Selection Service |
| CPSK | Coherent Phase Shift Keying |
| CPT | Compatibility test |
| CPU | Central Processing Unit |
| CQPSK | Coherent Quadrature Shift Keying |
| CR | Community Reception |
| CRA | Call Routing Apparatus |
| CRAFT | Cooperative Research Action for Technology |
| CRAG | Cellular Radio Advisory Group |
| CRC | Cyclic Redundancy Code |
| CRIMP | Cross Impact Model |
| CRO | Central Radio Office |
| CRS | Cellular Radio System |
| CRS | Cellular Radiotelephone Service |
| CRT | Connexion au Réseau Terrestre (French Switching |
| Equipment) | |
| CS2 | Capability Set 2 |
| CS | Circular Scanning |
| CS | Coast Station |
| CS | Communication Satellite |
| CS | Control Section |
| CSA | Carrier Serving Area |
| CSCW | Computer Supported Cooperative Work |
| CSDN | Circuit Switched Data Network |
| CSE | CAMEL Service Environment |
| CSELT | Centro Studi e Laboratori Telecomunicazioni or |
| Centre for Telecommunications Research and | |
| Testing (Italy) | |
| CSF | Customer Service Function |
| CSI | CAMEL Service Indicator (q.v. SCM) |
| CSI | Customer Sited Interconnection |
| CSK | Compatible Shift Keying |
| CSMA | Carrier-Sense Multiple Access |
| CSMA-CD | Carrier Sense Multiple Access with Collision |
| Detection | |
| CSMA/CA | Carrier Sense Multiple Access with Collision |
| Avoidance (LAN) | |
| CSPDN | Circuit Switched Public Data Network |
| CSTA | Computer Supported Telephony Application |
| CSV | Circuit Switched Voice |
| CT | Conformance Test |
| CT | Cordless Telecommunications Mobility |
| CT-1 | European analogue cordless telephone system |
| CT-2 | Second generation cordless telephone, Digital |
| CTD | Cell Transfer Delay |
| CTE | Channel Translation Equipment |
| CTI | Computer Telephony Integration |
| CTIA | Cellular Telecommunications Industry Association |
| CTN | Corporate Telecommunication Network |
| CTO | Commonwealth Telecommunications Organisation |
| CTR | Common Technical Regulation |
| CTS | Central Transmitting Station |
| CTS | Communications and Tracking System |
| CTS | Conformance Testing Service |
| CTU | Central Timing Unit |
| CTU | Circuit Terminating Unit |
| CUG | Closed User Group |
| CURTS | Common User Radio Transmission System |
| CVSDM | Continuously Variable Slope Delta Modulation |
| CW | Call Waiting |
| CWS | Central Wireless Station |
| CYTA | Cyprus Telecommunications Agency |
| D-AMPS | Digital AMPD (also know as IS-136) |
| D/A | Digital-to-Analogue |
| DA | Destination Address (LAN) |
| DA | Device Address (SNA) |
| DAA | Data Access Arrangement |
| DAB | Digital Audio Broadcasting |
| DACAPS | Data Collection and Processing System |
| DACC | Direct Access Communication Channel |
| DACS | Digital Access Cross Connect Service |
| DAE | Data Acquisition Equipment |
| DAGC | Delayed Automatic Gain Control |
| DAI | Digital Audio Interface (104 kbit/s) |
| DAL | Direct Access Line |
| DAM | Dynamic Amplitude Modulation |
| DAMA | Demand Assignment Multiple Access |
| DANAK | Dansk Akkreditering or National Danish |
| Accreditation Scheme | |
| DAS | Data Acquisition System |
| DAS | Dual Attachment Station (FDDI) |
| DASD | Direct Access Storage Device |
| DASK | Differential Amplitude Shift Keying |
| DASS | Digital Access Signalling System |
| DASY | Data Analyzer System |
| DAT | Digital Audio Tape |
| DATEC | Digital Adaptive Technique for Efficient |
| Communications | |
| DATPAC | Packet Switched Digital Data Network |
| DATS | Data Transmission System |
| DAU | Data Acquisition Unit |
| DAU | Data Adapter Unit |
| DB | Data Byte |
| DBC | Decimal-Binary Conversion |
| DBK | Data Bank |
| DBMS | Data Base Management System |
| DBPSK | Differential Binary Phase Shift Keying |
| DBS | Data-base System |
| DBS | Direct Broadcast by Satellite |
| DC | Direct Current |
| DCC | Data Communication Channel |
| DCCH | Dedicated Control Channel |
| DCCH | Digital Control Channel |
| DCD | Data Correlation and Documentation |
| DCDM | Digitally Controlled Delta Modulation |
| DCE | Data Communications Equipment |
| DCE | Distributed Computing Environment |
| DCF | Data Communications Function Block (TMN) |
| DCF | Data Count Field |
| DCMA | Digital Communication with Multiple Access |
| DCMSK | Differentially Coherent Minimum Shift Keying |
| DCN | Data Communications Network |
| DCP | Digital Communications Protocol |
| DCPLMTS | Digital Cellular Public Land Mobile Telephone |
| System | |
| DCPN | Domestic Customer Premises Network |
| DCPSK | Differential Coherent Phase Shift Keying |
| DCR | Data Conversion Receiver |
| DCS1800 | Digital Communications System1800 MHz. |
| DCS | Digital Cellular System |
| DCS | Digital Communication System |
| DCT | Discrete Cosine Transform |
| DCU | Digital Concentor Unit |
| DDAS | Digital Data Acquisition System |
| DDBS | Distributed Data Base System |
| DDD | Digital Data Demodulator |
| DDD | Direct Distance Dialling |
| DDE | Dynamic Data Exchange |
| DDF | Digital Distribution Frame |
| DDH | Data Digital Handling |
| DDI | Direct Dialling In |
| DDM | Difference Discrete Modulation |
| DDM | Digital Data Multiplexer |
| DDN | Defence Data Network |
| DDPS | Digital Data Processing System |
| DDR | Dial-on-Demand Routing |
| DDS | Digital Data Service |
| DECPSK | Differentially Encoded Coherent Phase Shift Keying |
| DECT | Digitally Enhanced Cordless Telecommunications |
| DEM | Digital Elevation Model |
| DEMKO | Danmarks Elektriske Materielkontrol (Electrical |
| Testing Laboratory, Denmark) | |
| DEPSK | Differential Encoded Phase Shift Keying |
| DES | Data Encryption Standard |
| DF | Directional Finding |
| DF | Distortion Factor |
| DFC | Data Flow Control |
| DFFMS | Digital Feedback Frequency Modulation System |
| DFM | Digital Frequency Meter |
| DFS | Digital Frequency Synthesizer |
| DFS | Distributed File System |
| DFSK | Double Frequency Shift Keying |
| DFT | Diagnostic Function Test |
| DFT | Discrete Fourier Transform |
| DFT | Distributed Function Terminal (SNA) |
| DG | Directorate General (CEC) |
| DG | XIII Directorate General XIII from the Commission of |
| European Community | |
| DGPS | Differential Global Positioning System |
| DHE | Data Handling Equipment |
| DHS | Data Handling System |
| DICOM | Digital Communication |
| DID | Direct Inward Dialling |
| DIEL | Advisory Committee on Telecommunications for |
| Disabled and Elderly People (UK) | |
| DIF | Direction Finder |
| DIGICOM | Digital Communication |
| DIGISAT | Digital Satellite Service |
| DIGS | Digital Communications System |
| DILIC | Dual Inline Integrated Circuit |
| DIN | Deutsches Institut für Normung (German Standards |
| Institute) | |
| DIP | Dual In Line Package (integrated circuits) |
| DIS | Digital Identification Signal |
| DIS | Draft International Standard |
| DIU | Digital Interface Unit |
| DJSU | Digital Junction Switching Unit |
| DLC | Digital Loop Carrier |
| DLE | Digital Local Exchange |
| DLG | Digital Line Graph |
| DLL | Dynamic Link Library |
| DLU | Digital Line Unit |
| DM | Delta Modulation |
| DM | Disconnected Mode (HDLC) |
| DMA | Data Management Amendment |
| DMB | Dynamic Multipoint Bridging |
| DMC | Desktop Multimedia Conferencing |
| DME | Distance Measuring Equipment |
| DME | Disttributed Management Environment |
| DMS | Data Management System |
| DMS | Digital Multiplex Switch |
| DMSU | Digital Main Switching Unit |
| DMW | Decimetric Waves |
| DNA | Digital Network Architecture |
| DNIC | Data Network Identification Code (X.121) |
| DNIS | Dialled Number Idenfication Service |
| DNL | Dynamic Noise Limiter |
| DNS | Domain Name Service |
| DNU | Digital Networking Unit |
| DOSE | Direction of arrival by Signal Elimination |
| DOV | Data Over Voice |
| DPC | Data Processing Centre |
| DPCM | Delta Pulse Code Modulation |
| DPE | Data Processing Equipment |
| DPHM | Differential Phase Modulation |
| DPLL | Digital Phase Locked Loop |
| DPM | Differential Phase Modulation |
| DPNSS | Digital Private Network Signalling System |
| DPPM | Differential Pulse Position Modulation |
| DPS | Data Processing System |
| DPSK | Differential Phase Shift Keying |
| DPWM | Differential Pulse Width Modulation |
| DQDB | Distributed Queue Dual Bus |
| DQPSK | Differential Quadrature Phase Shifting Key |
| DR | Distortion Ratio |
| DR | Dynamic Range |
| DRA | Dielectric Rod Antenna |
| DRAMS | Digital Recording and Measuring System |
| DRCS | Digital Radio Concentrator System |
| DRCS | Distress Radio Call System |
| DRP | Directional Radiated Power |
| DRS | Data Relay Satellite |
| DS | Digital Signal |
| DS | Direct Sequence |
| DSA | Directory Service Agent |
| DSA | Distributed Systems Architecture |
| DSB | Double-Sideband |
| DSB-SC-AM | Double Sideband-Suppressed Carrier-Amplitude |
| Modulation | |
| DSB-SC-ASK | Double Sideband-Suppressed Carrier-Amplitude |
| Shift Keying | |
| DSE | Data Switching Equipment |
| DSG | Data Systems Group |
| DSI | Detailed Spectrum Investigation (as conducted by |
| CEPT/ERO) | |
| DSK | Delay Shift Keying |
| DSL | Digital Subscriber Line |
| DSMA | Digital Sense Multiple Access |
| DSN | Derived Services Network |
| DSP | Digital Signal Processor |
| DSPS | Digital Signal Processing System |
| DSRR | Digital Short Range Radio |
| DSS | Digital Subscriber Signalling System (ISDN, |
| B-ISDN) | |
| DSS | Digital Switched Services |
| DSSS | Direct Sequence Spread Spectrum |
| DSTE | Data Subscriber Terminal Equipment |
| DSU | Digital Service Units |
| DSVD | Digital Simultaneous Voice and Data |
| DTAP | Direct Transfer Application Part |
| DTC | Data Transmission Channel |
| DTDMA | Distributed Time-Division Multiple Access |
| DTE | Data Terminal Equipment |
| DTLU | Digital Terminal Line Unit |
| DTM | Digital Terrain Model |
| DTMF | Dual Tone Multi Frequency |
| DTP | Detail Test Plan |
| DTS | Digital Transmission System |
| DTU | Data Transfer Unit |
| DUT | Device Under Test |
| DVB | Digital Video Broadcasting |
| DVM | Data over Voice Multiplexer |
| DVM | Digital Voltmeter |
| DVN | Digital Video-Frequency Network |
| DVT | Digital Video Terminal |
| DWDM | Dense Wavelength Division Multiplexing |
| DXI | Data Exchange Interface (ATM, SMDS) |
| Electronic Mail | |
| E/O | Electro-optical Conversion |
| EA | Evaluation Authority |
| EBCDIC | Ext ended Binary Coded Decimal Interchange Code |
| EBCS | Electronics Business Communication System |
| EBIT | European Broadband Interconnection Trial |
| EBU | European Broadcasting Union |
| ECFRN | European Consultative Forum for Research |
| Networking | |
| ECHO | European Commission Host Organization |
| ECITC | European Committee for IT Testing and |
| Certification | |
| ECM | Electronic Countermeasures |
| ECMA | European Computer Manufacturers Association |
| ECP | European Common Proposal |
| ECS | Experimental Communications Satellite |
| ECSA | European Computing Software Association |
| ECSA | Exchange Carriers Standards Association |
| ECSS | European Communications Satellite System |
| ECTRA | European Committee for Telecommunications |
| Regulatory Affairs | |
| ECTS | Electronic Custom Telephone System |
| ECTUA | European Council of Telecommunications Users |
| Association | |
| ED | Error Detecting |
| EDGE | Enhanced Data-Rates for GSM Evolution |
| EDH | Electronic Document Handling |
| EDI | Electronic Data Interchange |
| EDIFACT | Electronic Data Interchange For Administration, |
| Commerce, and Trade (ANSI) | |
| EDM | Electronic Distance Measurement |
| EDP | Electronic Data Processing |
| EDR | Equivalent Direct Radiation |
| EEMA | European Electronic Mail Association |
| EES | Experimental Earth Station |
| EESS | Earth Exploration-Satellite Service |
| EFR | Enhanced Full Rate |
| EFS | End of Frame Sequence (LAN) |
| EFTA | European Free Trade Association |
| EFTPOS | Electronic Funds Transfer Point of Sale |
| EGSM | Extended Global System for Mobile |
| Communications | |
| EH | Electronic Highways |
| EHF | Extremely High Frequency |
| EI | Expansion Interface |
| EIA | Electronics Industry Association |
| EIN | European Informatics Network (predecessor of |
| Euronet) | |
| EIR | Equipment Identity Register |
| EISA | Extended Industry Standard Architecture |
| EIUF | European ISDN User Forum |
| ELB | Emergency Location Beacon |
| EMA | Enterprise Management Architecture |
| EMAG | ETSI MIS Advisory Group |
| EMC | Electro-magnetic Compatibility |
| EMF | Electromagnetic Field |
| EMS | Electromagnetic Spectrum |
| EMS | Expanded Memory Specification |
| EMW | Electromagnetic Wave |
| EN | Norme Européenne (European Standard) |
| ENF | European Numbering Forum |
| ENG | Equivalent Noise Generator |
| ENG/OB | Electronic News Gathering/Outside Broadcast |
| ENO | European Numbering Office |
| ENS | Enterpise Network Services |
| ENSO | ETSI National Standardisation Organisations (ETSI) |
| ENT | Equivalent Noise Temperature |
| ENV | European pre-standard |
| EOTC | European Organisation for Testing and Certification |
| EPHOS | European Procurement Handbook for Open Systems |
| EPIRB | Emergency Position Indicating Radio Beacons |
| EPIRS | Emergency Position Indicating Radiobeacon Station |
| EPSS | Electronic Packet Switched Data Transmission |
| System | |
| ER | Essential Requirement(s) |
| ERC | European Radiocommunications Committee |
| ERMES | European Radio Messaging System |
| ERO | European Radiocommunications Office |
| ERS | Earth Resources Satellite |
| ERS | Effective Receiver Sensitivity |
| ERSS | Earth Remote Sensing Satellite |
| ESA | European Space Agency |
| ESB | European Standardisation Board |
| ESC | European Standardisation Council |
| ESD | European Standards Database |
| ESDI | Enhanced Small Device Interface |
| ESI | End System Identifier (ATM, ISO) |
| ESIG | European SMDS Interest Group |
| ESLNT | Equivalent Satellite Link Noise Temperature |
| ESMR | Enhanced Specialised Mobile Radio |
| ESN | Equipment Serial Number |
| ESO | European Standardisation Organisation |
| ESP | EBIT Service Project |
| ESP | Enhanced Service Provider |
| ESPRIT | European Strategic Programme for Research and |
| Development | |
| ESRS | Electronic Scanning Radar System |
| ESS | Electronic Switching System |
| ESS | European Standardisation System |
| ESS | Experimental Synchronous Satellite |
| ESSA | Environmental Survey Satellite |
| EST | Earth Station Transmitter |
| ESV | Earth Satellite Vehicle |
| ETACS | Extended Total Access System |
| ETCI | Electro-Technical Council of Ireland |
| ETNO | Association of European Public |
| Telecommunications Network Operators | |
| ETO | European Telecommunications Office |
| ETP | European Telecommunications Platform |
| ETR | ETSI Technical Report |
| ETS | European Telecommunication Standard |
| ETSA | European Telecommunication Services Association |
| ETSI | European Telecommunications Standards Institute |
| EU | European Union |
| EUMETSAT | European Meteorological Satellite Organisation |
| EUREKA | European Research Co-operation Agency |
| EURESCOM | European Institute for Research and Strategic |
| Studies in Telecommunications | |
| EUROBIT | European Association of Manufacturers of Business |
| Machines and Data Processing Equipment | |
| EurOSINET | European OSI Network |
| EUSIDIC | European Association of Information Services |
| EUTELSAT | European Telecommunications Satellite |
| Organisation | |
| EVM | Electronic Voltmeter |
| EWOS | European Workshop for Open Systems |
| EWP | ETSI Work Programme |
| FAC | Fully Allocated Costs |
| FACCH | Fast Association Control Channel |
| FAGC | Fast Automatic Gain Control |
| FAL | Frequency Allocation List |
| FAM | Frequency Amplitude Modulation |
| FAS | Frame Alignment Sequence (T-1, E.1) |
| FATDL | Frequency and Time Division Data Link |
| FC | Functional Component |
| FCC | Federal Communications Commission |
| FCCH | Forward Control Channel |
| FCS | Facsimile Communication System |
| FD | Fault Detection |
| FD | Frequency Division |
| FD-PSK | Frequency-Differential Phase Shift Keying |
| FDD | Frequency Division Duplex |
| FDDI | Fibre Distributed Data Interface |
| FDDL | Frequency Division Data Link |
| FDM | Frequency Division Multiplex(ed) |
| FDMA | Frequency Division Multiple Access |
| FEC | Forward Error Correction |
| FEI | Federation of the Electronics Industry (UK) |
| FES | Fixed Earth Station |
| FET | Field Effect Transistor |
| FF | Fixed Frequency |
| FF | Frequency Feedback |
| FFSK | Fast Frequency Shift Keying |
| FGMDSS | Future Global Maritime Distress and Safety System |
| FGS | Fixed Ground Station |
| FH | Frequency Hopping |
| FH/DS | Frequency-Hopping Direct Sequence |
| FIAG | Framework Interconnection Agreement Guidelines |
| Fll | Failure Indication Information |
| FIM | Field Intensity Meter |
| FITL | Fiber In The Loop |
| FM | Frequency Modulation |
| FM | Frequency Multiplexing |
| FMC | Fixed Mobile Convergence |
| FMH | Function Management Header (SNA) |
| FPLMTS | Future Public Land Mobile Telecommunications |
| Systems | |
| FRAD | Frame Relay Access Device |
| FRBS | Frame Relay Bearer Service |
| FRC | Fixed Radio Communication |
| FRF | Frame Relay Forum |
| FRM | Functional Reference Model |
| FRS | Frame Relay Service |
| FS | Frequency Shift |
| FSCE | Free Space Communication Equipment |
| FSK | Frequency Shift Keying |
| FSL | Flexible Service Logic |
| FSL | Free Space Loss |
| FSM | Field Strength Meter |
| FSS | Fixed-Satellite Service |
| FSS | Frequency-Shift Signal |
| FST | Frequency Shift Transmission |
| FT | Frequency Tolerance |
| FTAM | File Transfer Access & Management |
| FTDMA | Frequency and Time Division Multiple Access |
| FTM | Frequency Time Modulation |
| FTP | File Transfer Protocol |
| FTTC | Fibre to the Curb |
| FTTH | Fiber to the Home |
| FUNI | Frame User-to-Network Interface (ATM) |
| FVC | Forward Voice Channel |
| FWS | Fixed Wireless Station |
| GA | General Assembly (ETSI) |
| GAP | Generic Access Profiles |
| GATT | Global Agreement on Tariffs and Trade |
| GBSAS | Ground-Based Scanning Antenna System |
| GCC | Generic Conference Control |
| GCC | Ground Control Center |
| GCRA | Generic Cell Rate Algorithm |
| GFC | Generic Flow Control (ATM) |
| GFI | General Format Identifier (X.25) |
| GFPM | Gated Frequency Position Modulation |
| GFSK | Gaussian Frequency Shift Keying |
| GGE | Ground Guidance Equipment |
| GGSN | Gateway GPRS Support Node |
| GIO | Generic Interface for Operations (SMDS) |
| GIS | Geographical Information System |
| GLONASS | Global Navigation Satellite System |
| GMDSS | Global Maritime Distress and Safety System |
| GME | Group Modulating Equipment |
| GMF | Geomagnetic Field |
| GMPCS | Global Mobile Personal Communications System by |
| Satellite | |
| GMS | Geo-stationary Meteorological Satellite |
| GMSC | Gateway Mobile Services Switching Centre |
| GMSK | Gaussian Minimum Shift Keying |
| GNCS | Guidance, Navigation and Control System |
| GNP | Gross National Product |
| GOES | Geo-stationary Operational Environmental Satellite |
| GOS | Global Observing System |
| GoS | Grade of Service |
| GOSIP | Government Open Systems Interconnection Profile |
| GPIB | General Purpose Interface Bus |
| GPRS | General Packet Radio Service |
| GPRT | General Purpose Radio Transmitter |
| GPS | Global Positioning System |
| GPSCS | General Purpose Satellite Communications System |
| GRS | Ground Receiving Station |
| GS | Geo-stationary Satellite |
| GS | Ground Station |
| GS | Guidance System |
| GSA | GSM System Area |
| GSL | Ground-Space Link |
| GSLB | Groupe spécial large bande (CEPT group on |
| broadband telecommunications) | |
| GSM | Global System for Mobile Communication |
| GSM | Global System for Mobile Communications |
| GSM | MS GSM Mobile Station |
| GSM | PLMN GSM Public Land Mobile Network |
| GSMA | Global Scheduling Multiple Access |
| GSN | GPRS Support Node |
| GSO | Geo-stationary Orbit |
| GSS | Geodetic Stationary Satellite |
| GSS | Group Switching Subsystem |
| GTD | Geometric Theory of Diffraction |
| HADM | Hybrid Analog and Digital Modulation |
| HADTS | High Accuracy Data Transmission System |
| HBS | Home Base-Station |
| HCM | High Capacity Multiplexing |
| HCSPR | Hundred Call Seconds Per Hour |
| HCV | High Capacity Voice |
| HDDV | High Definition Digital Video |
| HDLC | High-Level Data Link Control |
| HDML | Handheld Device Mark-up Language |
| HDSL | High-data-rate Digital Subscriber Line |
| HDT | Host Digital Terminal |
| HDTM | Half-Duplex Transmission Module (X.25) |
| HDWDM | High Density Wavelength Division Multiplex |
| HDX | Half-Duplex |
| HES | Home Electronic System(s) |
| HF | Height Finder |
| HF | High Frequency |
| HFAA | High Frequency Airborne Antenna |
| HFRDF | High Frequency Radio Direction Finder |
| HFRT | High Frequency Radio Transmitter |
| HFWB | High Frequency Wire Broadcasting System |
| HG | Harmonic Generator |
| HGA | High Gain Antenna |
| HIPERLAN | High performance local area network |
| HIPPI | High Performance Parallel Interface |
| HLL | High Level Language |
| HLR | Home Location Register |
| HMSC | Home Mobile Switching Centre |
| HNPA | Home Number Plan Area |
| HOSTID | Host Identifier |
| HPF | Highest Possible Frequency |
| HPR | High Performance Routing |
| HSC | Hierarchical Cell Structure |
| HSCSD | High Speed Circuit Switched Data |
| HSLAN | High Speed LAN |
| HSPSD | High-Speed Packet Switched Data |
| HSSI | High-Speed Serial Interface (ANSI) |
| HTML | Hypertext Markup Language |
| HTTP | Hypertext Transfer Protocol (IETF) |
| I-ETS | Interim European Telecommunications Standard |
| IACS | Inegrated Access and Crossconnect System |
| IAFIS | Integrated Automated Fingerprint Identification |
| System | |
| IAGC | Instantaneous Automatic Gain Control |
| IAM | Initial Address Message (SS7) |
| IANA | Internet Address Naming Authority |
| IAPSK | Independent Amplitude and Phase Shift Keying |
| IARU | International Amateur Radio Union |
| IATCS | International Air Traffic Communication Station |
| IAVC | Instantaneous Automatic Volume Control |
| IBC | Integrated Broadband Communication |
| IBCN | Integrated Broadband Communications Network |
| IBN | Integrated Broadband Network |
| IC | Integrated Circuit |
| ICCB | Internet Control and Configuration Board |
| ICD | International Code Designator (ISO) |
| ICI | Intercarrier Interface (SMDS) |
| ICMP | Internet Control Message Protocol |
| ICP | Instituto das Comunicações de Portugal (The |
| Portuguese Institute of Communications) | |
| ICP | Internet Control Protocol |
| ICR | Interference-to-Carrier Ratio |
| ICS | Integrated Communication System |
| ICS | International Code of Signals |
| ICT | Information and Communication Technologies |
| IDA | Integrated Data Access or |
| Integrated Digital Access | |
| IDI | Initial Domain Identifier (ISO) |
| IDLC | Integrated Digital Loop Carrier (Telephony) |
| IDN | Integrated Digital Network |
| IDNX | Integrated Digital Network Exchange |
| IDP | Internet Datagram Protocol |
| IDVM | Integrating Digital Voltmeter |
| IEC | Interconnection Extension Circuit |
| IEC | International Electrotechnical Commission |
| IES | Information Exchange Services |
| IESG | Internet Engineering Steering Group |
| IETF | Internet Engineering Task Force |
| IFRB | International Frequency Registration Board |
| IFS | Interfering Signal |
| IFT | International Frequency Table |
| IHL | Internet Header Length (IP) |
| IIT | Integrated Information Transport |
| ILBC | Independent Local Exchange Carrier |
| ILF | Infra-Low Frequency |
| ILS | Instrument Landing System |
| IMCC | ISDN Management and Co-ordinating Committee |
| IME | International Mobile Station Equipment Identity |
| IMT | Impulse-Modulated Telemetry |
| IMT | International Mobile Telecommunications |
| IMTC | International Multimedia Conferencing Consortium |
| IMTS | Improved Mobile Telephone Service |
| IMUI | International Mobile User Identity |
| IMUX | Inverse Multiplexer/Intelligent Multiplexer |
| IN | Intelligent Network |
| INAP | Intelligent Network Application Part |
| INCA | Inter Network Call Accounting System |
| INMARSAT | International Marine Satellite Organisation |
| INMS | Integrated Network Management System |
| INTELSAT | International Telecommunications Satellite |
| Organisation | |
| INTUG | International Telecommunications User Group |
| IOC | Inter Office Channel |
| ION | Integrated Optical Network |
| IP | Integrated Peripheral |
| IP | Internet Protocol |
| IPA | Intermediate Power Amplifier |
| IPNS | ISDN PBX Networking Specification |
| IPNS Forum | A body committed to accelerate the development of |
| the QSIG standard by providing co-ordinated input | |
| to ECMA | |
| IPR | Intellectual Property Rights |
| IPS | Instructions per Second |
| IPSS | International Packet Switching Service |
| IPX | Internetwork Packet Exchange |
| IRAS | Internet Routing and Access Service |
| IRCS | International Radio Call Sign |
| IRP | Independent Routing Processor |
| IRPA | International Radiation Protection Association |
| IRS | International Radio Station |
| IRSG | Internet Research Steering Group |
| IRT | Integrated Rural Telematics |
| IRTA | Integrated Regional Telematics Architecture |
| IRTF | Internet Research Task Force |
| IS | Information Systems |
| IS | Interim Standard (ISO) |
| IS | Intermediate System (ETSI TC BT) |
| IS-PBX | Integrated Services Private Branch Exchange |
| ISA | Industry Standard Architecture |
| ISB | Independent Side Band |
| ISC | International Switching Centre |
| ISDN | Integrated Services Digital Network |
| ISIS | International Satellite for Ionospheric Studies |
| ISL | Intersatellite Link |
| ISM | ISDN Standards Management |
| ISN | Information Systems Network |
| ISO | International Organisation for Standardisation |
| ISOC | Internet Society |
| ISP | Internet Service Provider |
| ISTC | International Satellite Transmission Center |
| ISTC | International Switching and Testing Center |
| ISV | Independent Software Vendor |
| IT | Information Technology |
| IT&T | Information Technology and Telecommunications |
| ITA | International Telegraph Alphabet |
| ITC | International Teletraffic Congress |
| ITN | Independent Telecommunication Network |
| ITSTC | Information Technology Steering Committee |
| ITU | International Telecommunication Union |
| ITUSA | Information Technology Users’ Standards |
| Association | |
| IVDM | Integrated Voice Data Multiplexer |
| IVDS | Interactive Video Data Services |
| IVDT | Integrated Voice and Data Terminal |
| IVN | Intervening Network (ETSI TC BT) |
| IVR | Interactive Voice Response |
| IVS | Interactive Video Service |
| IWU | Interworking Unit (ETSI TC BT) |
| JEEC | Joint ECMA ETSI Programme Committee (ETSI) |
| JPEG | Joint Photographic Experts Group (ISO) |
| JPG | Joint Presidents Group |
| (CEN/CENELEC/ETSI) | |
| JRTIC | Joint Radiophone Technical Interfaces Group |
| JTC | Joint Technical Committee (EBU/ETSI and |
| ISO/IEC) | |
| JTCG | Joint Technical Co-ordination Group |
| JTM | Job Transfer and Management |
| KCS | KTL Certification Services |
| KTILA | Development Centre for Telecommunications |
| (Greece) | |
| KTS | Key Telephone System |
| LAA | Linear Array Antenna |
| LADS | Local Area Data Service |
| LAI | Location Area Identification or Identity |
| LAMs | Line Adaptor Modules |
| LAN | Local Area Network |
| LANS | Local Area Network Services |
| LAP | Link Access Procedure (X.25) |
| LAPF | Link Access Procedure to Frame Mode Bearer |
| Services (FR, ISDN) | |
| LAPM | Link Access Procedure for Modems (V.42) |
| LAPX | Link Access Procedure half-duplex (X.32) |
| LAS | Low-Altitude Observation Satellite |
| LASS | Local Area Signalling Services |
| LATA | Local Access and Transport Area |
| LCM | Line Concentrator Module |
| LCN | Local Communication Network |
| LCN | Logical Channel Number (X.25) |
| LD | Loop Disconnect |
| LDDI | Local Distributed Data Interface (ANSI) |
| LDM | Linear Delta Modulation |
| LDN | Listed Directory Number |
| LEC | Local Exchange Carrier |
| LED | Light Emitting Diode |
| LEO | Low Earth Orbit |
| LEOS | Low Earth Orbit Satellites |
| LHCP | Left Handed Circular Polarization |
| LHPW | Left-Hand Polarized Wave |
| LI | Length Indicator |
| LIDB | Line Information Database (ISDN) |
| LMC | Land Mobile Communications |
| LMDS | Local Multipoint Distribution System |
| LMI | Local Management Interface |
| LMSS | Land Mobile Satellite Service |
| LMT | Local Maintenance Terminal |
| LNA | Logarithmic Narrow-Band Amplifier |
| LORAN | Long Range Navigation System |
| LOSRRS | Line-of-Sight Radio Relay System |
| LPCM | Linear Pulse Code Modulation |
| LPD | Low Power Device |
| LPI | Low Probability of Intercept |
| LRN | Long-Range Navigation |
| LRRP | Lowest Required Radiated Power |
| LSB | Least Signifcant Bit |
| LSI | Large Scale Integration |
| LSL | Link Support Layer |
| LSPSD | Low-Speed Packet Switched Data |
| LTE | Line Terminating Equipment |
| LTM | Line-Type Modulation |
| LTU | Line Termination Unit |
| LUF | Lowest Usable Frequency |
| LVD | Low Voltage Directive |
| MAACS | Multi-Address Asynchronous Communication |
| System | |
| MAC | Multiplexed Analogue Components or |
| Medium Access Control | |
| MADS | Multiple Access Data System |
| MAF | Management Application Function (TMN) |
| MAI | Mobile Allocation Index |
| MAN | Metropolitan Area Networks |
| MAP | Manufacturing Automation Protocol |
| MAP | Mobile Application Part |
| MAR | Memory Address Register |
| MARISAT | Maritime Satellite Communication System |
| MARS | Manned Astronautical Research Station |
| MARSAT | Maritime Satellite |
| MAS | Multiple Access System |
| MASK | Multilevel Amplitude Shift Keying |
| MATSE | Mobile Automatic Telephone System - Europe |
| MAU | Medium Attachment Unit (Ethernet) |
| MBFT | Multipoint Binary Transfer File |
| MBR | Maritime Business Radio |
| MCC | Mobile Country Code |
| MCF | Message Communication Functions (TMN) |
| MCL | Mercury Communications Limited |
| MCN | Mobile Control Node |
| MCPC | Multiple Channel Per Carrier |
| MCPR | Multimedia Communication Processing and |
| Representation | |
| MCR | Minimum Cell Rate (ATM) |
| MCS | Multipoint Communication Service |
| MCT | Model Compatibility Test |
| MCU | Multipoint Control Unit |
| MCVF | Multi-Channel Voice Frequency |
| MDB | Management Database |
| MDBS | Mobile Database Station |
| MDF | Main Distribution Frame |
| MDNS | Managed Data Network Services |
| MDR | Memory Data Register |
| MDS | Multipoint Distribution Services |
| MDSL | Moderate Speed Digital Subscriber Line |
| MDTRS | Mobile Digital Trunked Radio Systems |
| ME | Maintenance Entities (TMN) or |
| Mobile Equipment | |
| MEF | Maintenance Entity Function (TMN) |
| MEG | Mobile Experts Group |
| MENL | Maximum External Noise Level |
| MEO | Medium Earth Orbit |
| MEOS | Medium Earth Orbit Satellites |
| MExE | Mobile station application Execution Environment |
| MF | Multi Frequency or |
| Mediation Function Block (TMN) | |
| MFC | Multi Frequency Code |
| MFKP | Multi-Frequency Key Pulsing |
| MFLOPS | Millions of Floating Point Operations Per Second |
| MFS | Multiple Frequency Shift |
| MHS | Message Handling System |
| MIB | Management Information Base (TMN) |
| MID | Message Identifier (ATM, SMDS) |
| MID | Multiplexing Identifier (ATM) |
| MIDA | Multiple Integrated Digital Access (UK) |
| MIFR | Master International Frequency Register |
| MIME | Multipurpose Internet Mail Extension |
| MIN | Mobile ID number |
| MINIT | Minimum Interference Threshold |
| MIPS | Millions of Instructions Per Second |
| MIS | Management Information System |
| MLC | Multilink Control Field (X.25) |
| MLP | Multilink Protocol (X.25) |
| MLS | Microwave Landing System |
| MLS | Multiple Listing Service |
| MMDS | Multichannel, Multipoint Distribution System |
| MMS | Maritime Mobile Service |
| MMSE | Minimum Mean Square Error |
| MMSI | Maritime Mobile Service Identities |
| MMSS | Maritime Mobile Satellite Service |
| MOC | Mobile Originating Call |
| MOL | Manned Orbital Laboratory |
| MOP | Maintenance Operations Protocol |
| MOS | Manned Orbiting Station |
| MoU | Memorandum of Understanding |
| MPASK | Multiple Phase Amplitude Shift Keying |
| MPOA | Multiprotocol Over ATM |
| MPSK | Multilevel Phase Shift Keying |
| MRA | Mutual Recognition Agreement |
| MRC | Mobile Radiocommunications |
| MRCF | Maximum Rate of exchange of Frequency |
| MS | Mobile Station |
| MSB | Most Significant Bit |
| MSC | Mobile Switching Centre |
| MSIN | Mobile Station Identification Number |
| MSISDN | Mobile Station International ISDN |
| MSK | Minimum Shift Keying |
| MSRN | Mobile Station Roaming Number |
| MSS | MAN Switching System or Mobile Satellite Service |
| MSS | Mobile Satellite System |
| MSSC | Mobile Satellite Switching Center |
| MSSHO | Mobile Speed Sensitive Handover |
| MST | Multi-Service Terminal |
| MTA | Mail Transport Agent |
| MTA | Message Transfer Agent |
| MTS | Message Toll Service |
| MTS | Message Transfer System |
| MUF | Maximum Usable Frequency |
| MVDS | Multipoint Video Distribution System |
| MVIP | Multi Vendor Integration Protocol |
| MVS | Multiple Virtual Storage |
| N-AMPS | Narrowband Advanced Mobile Phone System |
| NA | Network Aspects |
| NACD | Network Automatic Call Distribution |
| NACS | NetWare Asynchronous Communication Services |
| (NetWare) | |
| NAMAS | National Measurement Accreditation Service |
| NAP | Network Access Point (Internet) |
| NAS | Network Application Support |
| NBFM | Narrow Band Frequency Modulation |
| NBPSK | Narrow-Band Phase-Shift Keying |
| NBPSKT | Narrow Band Phase-Shift Keying Telegraphy |
| NBVM | Narrow-Band Voice Modulation |
| NCCF | Network Communication Control Facility |
| NCCN | Network Charge Change Notice |
| NCFSK | Non coherent Frequency Shift Keying |
| NCO | Numerical Control Oscillator |
| NCOP | Network Code of Practice |
| NCP | NetWare Core Protocol (NetWare) |
| NCTE | Network Channel Terminating Equipment |
| NDIS | Network Device Interface Standard |
| NE | Network Element (TMN) |
| NEF | Network Element Function Block (TMN) |
| NEMKO | Norwegian Board for Testing and Approval of |
| Electrical Equipment | |
| NETC | National Electronics Test Centre (Ireland) |
| NETID | Network Identifier |
| NFM | Narrow-Band Frequency Modulation |
| NFS | Network File System |
| NHRP | Next Hop Routing Protocol |
| NI | Network Interface |
| NIC | Network Identification Code |
| NIC | Network Interface Card (LAN) |
| NICC | Network Interoperability Consultative Committee |
| NICE | Network Information and Control Exchange |
| NID | Network Interface Device |
| NIST | National Institute of Standards and Technology |
| (USA) | |
| NIUF | North American ISDN Users Form |
| NL | Network Layer |
| NLDM | Network Logical Data Manager |
| NLPID | Network Layer Protocol Identifier |
| NLSP | NetWare Link Service Protocol |
| NM | Network Management |
| NM | Network Module |
| NMC | Network Management Centre |
| NMP | Network Management Protocol |
| NMRS | National Mobile Radio System |
| NMS | Network Management System |
| NMSI | National Mobile Station Identification number |
| NMSS | National Multipurpose Space Station |
| NMT | Nordic Mobile Telephone System |
| NN | Network Node |
| NNG | National Number Group |
| NNI | Network Node Interface (ATM) |
| NNI | Network-to-Network Interface (FR) |
| NOAF | Network Operator Facility |
| NOCC | Network Operations Control Centre |
| NORC | Network Operators Research Committee |
| NP | Network Performance |
| NP | Number Portability |
| NPA | Numbering Plan Area |
| NPC | Network Parameter Control (ATM) |
| NPDU | Network Layer Protocol Data Unit |
| NPI | Numbering Plan Identification |
| NRA | National Regulatory Authority |
| NREN | National Research and Education Network (USA) |
| NSAI | National Standards Authority of Ireland |
| NSAP | Network Service Access Point |
| NSAPA | Network Service Access Point Address (ISO) |
| NSC | Network Service Centre |
| NSOs | National Standards Organisations |
| NSP | Native Signal Processing |
| NSP | Network Service Protocol |
| NSPC | National Sound-Program Center |
| NSS | Navigation Satellite System |
| NT | Network Termination (ISDN) |
| NTA | Telestyrelsen or National Telecom Agency, |
| Denmark | |
| NTE | Network Terminating Equipment |
| NTI | National Telecom Inspectorate (Iceland) |
| NTIA | National Telecommunications and Information |
| Administration | |
| NTO | Network Terminal Option |
| NTP | Network Termination Point |
| NTRA | Norwegian Telecommunications Regulatory |
| Authority | |
| NTS | Number Translation Service |
| NTU | Network Termination Unit |
| NUI | Network User Identification |
| ÖN | Österreichisches Normungsinstitut or Austrian |
| Standards Institute | |
| ÖVE | Österreichischer Verband für Elektrotechnik or |
| Austrian Association for Electrotechnology | |
| OBCS | On-Board Communication Station |
| OC | Optical Carrier (SONET) |
| OCC | Other Common Carriers |
| OCHC | Operator Call Handling Centre |
| ODA | Office Document Architecture |
| ODA | Omnidirectional Antenna |
| ODIF | Open Document Interchange Format |
| OECD | Organisation for Economic Co-operation and |
| Development | |
| OEIC | Opto-electronic Integrated Circuit |
| OEM | Original Equipment Manufacturer |
| OFDM | Orthogonal Frequency-Division Multiplex |
| OFM | Optical Frequency Multiplexing |
| OFTEL | Office of Telecommunications (UK) |
| OID | Object Identifier |
| OLC | Optical Loop Carrier |
| OLI | Optical Line Inlet |
| OLO | Optical Line Outlet |
| OLO | Other Licensed Operator |
| OLR | Overall Loudness Rating |
| OLTE | Optical Line Terminating Equipment |
| OMC | Operations and Maintenance Centre |
| OME | Operator Mobile Exchange |
| OMP | Open Market Provision |
| ONA | Open Network Architecture |
| ONC | Open Network Computing |
| ONMS | Open Network Management System |
| ONP | Open Network Provision |
| ONU | Optical Network Unit |
| OOE | Organisation Outside ETSI |
| OQASK | Offset Quadrature Amplitude Shift Keying |
| OQPSK | Offset Quadrature Phase Shift Keying |
| OQRSK | Orthagonal Quadrature PSK |
| ORB | Omnidirectional Radiobeacon |
| ORM | Optically Remote switching Module |
| OS | Operating System |
| OSF | Operations Systems Function Block (TMN) |
| OSI | Open System Interconnect(ion) |
| OSI/NMF | OSI Network Management Form |
| OSINET | OSI Network |
| OSIRM | Open Systems Interconnection Reference Model |
| (ISO ITU-T) | |
| OSITOP | Open Systems Interconnecting/Technical and Office |
| Protocol | |
| OSS | Operation Support Systems |
| OTE | Hellenic Telecommunications Organisation (Greece) |
| OTE | Operator Tandem Exchange |
| OTF | Optimum Traffic Frequency |
| OWF | Optimum Working Frequency |
| PABX | Private Automatic Branch Exchange |
| PAC | Programme Advisory Committee (ETSI) |
| PACS | Personal Access Communications System |
| PACT | Public Access Cordless Telephony |
| PAD | Packet Assembler/Disassembler |
| PAM | Pulse Amplitude Modulation |
| PAMR | Public Access Mobile Radio |
| PBP | Packet Burst Protocol |
| PBX | Private Branch Exchange |
| PC | Path Control |
| PC | Program Counter |
| PCA | Position of Closed Approach |
| PCB | Printed Circuit Board |
| PCB | Process Control Block |
| PCI | Peripheral Component Interconnect |
| PCI | Pre-Connection Inspection or |
| Programmable Communication Interface | |
| PCIA | Personal Communications Industry Association |
| PCM | Pulse Code Modulation |
| PCMCIA | Personal Computer Memory Card International |
| Association | |
| PCN | Personal Communications Network |
| PCR | Peak Cell Rate (ATM) |
| PCS | Personal Communication Services |
| PCSN | Private Circuit Switching Network |
| PCT | Private Communication Technology |
| PCU | Premises Control Unit |
| PDA | Personal Digital Assistant |
| PDBM | Pulse Delay Binary Modulation |
| PDC | Personal Digital Cellular |
| Portable Document Format (Adobe) | |
| PDH | Plesiochronous Digital Hierarchy |
| PDM | Pulse-Duration Modulation |
| PDMA | Polarization Division Multiple Access |
| PDN | Public Data Network or |
| Partial Distinguished Name (TMN) | |
| PDOP | Position Dilution Of Position |
| PDS | Power Density Spectrum |
| PDU | Protocol Data Unit |
| PEAN | Pan-European ATM Network |
| PED | Portable Electronic Devices |
| PEP | Peak Envelope Power |
| PES | Personal Earth Station |
| PET | Planning Exercise in Telecommunications |
| technologies (forerunner of RACE) | |
| PEV | Peak Envelope Voltage |
| PF | Presentation Function (TMN) |
| PFC | Phase Frequency Characteristic |
| PFD | Phase-Frequency Detector |
| PFD | Power Flux Density |
| PFM | Pulse-Frequency Modulation |
| PH | Packet Handler (ISDN) |
| PHDM | Phase Difference Modulation |
| PICS | Protocol Implementation Conformance Statement |
| PIN | Personal Identification Number |
| PINX | Private Telecommunications Network Exchange |
| PITCOM | Parliamentary Information Technology Committee |
| (UK) | |
| PIXIT | Protocol Implementation Extra Information for |
| Testing | |
| PLC | Programming Logic Controller |
| PLISO | Plesisochronous |
| PLL | Phase Locked Loop |
| PLM | Pulse Length Modulation |
| PLMN | Public Land Mobile Network |
| PLMTS | Public Land Mobile Telephone System |
| PLP | Packet Layer Protocol (X.25) |
| PLU | Primary Logical Unit |
| PM | Phase Modulation |
| PM | Physical Medium |
| PMA | Physical Medium Attachment |
| PMBS | Packet Mode Bearer Service |
| PMD | Physical Medium Dependent (FDDI) |
| PML | Permitted Maximum Level |
| PMN | Public Mobile Network |
| PMR | Private Mobile Radio |
| PMS | Permitted Maximum Signal |
| PMSN | Public Mobile Satellite Network |
| PNM | Pulse Number Modulation |
| PNNI | Private Network Node Interface (ATM) |
| PNO | Public Network Operator |
| PNT | Private Network Termination |
| POC | Point Of Connection (switch connection) |
| POCSAG | Post Office Code Standards Advisory Group |
| POD | Programmable Option Devices |
| POI | Point Of Interconnect (network connection) |
| PON | Passive Optical Network |
| POSI | Promotion of OSI |
| POSIT | Profiles for Open Systems Interworking |
| Technologies | |
| POTS | Plain Old Telephone Service |
| PPS | Precise Positioning Service |
| PRI | Primary Rate Interface (ISDN) |
| PRM | Pulse Rate Modulation |
| PRN | Pseudo Random Noise |
| PRS | Premium Rate Service |
| PRSIG | Pacific Rim SMDS Interest Group |
| PS | Paging Systems |
| PSAR | Programmable Synchronous/ Asynchronous |
| Transmitter | |
| PSB | Public Service Board |
| PSC | Public Service Commission |
| PSD | Phase Sensitive Detector |
| PSD | Power Spectrum Density |
| PSDN | Packet Switched Data Network |
| PSE | Packet Switching Exchange |
| PSK | Phase Shift Keying |
| PSM | Pulse Spacing Modulation |
| PSN | People with special needs |
| PSN | Public Switched Network |
| PSPDN | Packet Switched Public Data Network |
| PSPM | Pulse Symmetrical Phase Modulation |
| PSTN | Public Switched Telecommunications Network |
| PSU | Power Supply Unit |
| PTI | Packet Type Identifier (X.25) |
| PTI | Payload Type Identifier (ATM) |
| PTM | Packet Transport Mode |
| PTN | Public Telecommunication Network |
| PTNX | Private Telecommunications Network Exchange |
| PTO | Public Telecommunication Operator |
| PTS | Public Telecommunications System |
| PTT | Post, Telephone, and Telegraph |
| PTTNS | Public Telecommunications Transport Networks and |
| Services | |
| PUC | Public Service Commission |
| PVC | Permanent Virtual Circuit |
| PVN | Private Virtual Network |
| PVP | Permanent Virtual Paths |
| PWM | Pulse-Width Modulation |
| PWT | Personal Wireless Telephone |
| PXML | Private Exchange Master List |
| Q-bit | Qualified data bit (X.25) |
| QA | Quality Assurance or |
| Q-Adapter | (TMN) |
| QAF | Q-Adapter Block (TMN) |
| QAM | Quadrature Amplitude Modulation |
| QASK | Quadrature Amplitude Shift Keying |
| QCIF | Quarter CIF |
| QDPSK | Quaternary Differential Phase Shift Keying |
| QFM | Quantized Frequency Modulation |
| QoS | Quality of Service |
| QPM | Quantized Phase Modulation |
| QPSX | Queued Packet Synchronous Exchange |
| QUAM | Quadrature Amplitude Modulation |
| QWA | Quarter Wave Antenna |
| R&TTE | Radio & Telecommunications Terminal Equipment |
| RA | Radiocommunications Agency |
| RACE | Research and Development in Advanced |
| Communications Technologies in Europe | |
| RACH | Random Access Channel |
| RACOM | Random Communication |
| RADAG | Radar Guidance |
| RADAR | Radio Detection and Ranging |
| RADAT | Radar Data Transmission |
| RADIC | Radio Interior Communication |
| RADSL | Rate Adaptive Digital Subscriber Line |
| RAI | Remote Alarm Indication |
| RAS | Remote Access Server (Remote LAN) |
| RBBS | Residential Broadband Service |
| RBN | Radiobeacon |
| RBS | Radio Beacon Station |
| RC | Reference Configuration |
| RCC | Reverse Control Channel |
| RCE | Remote Channel Extenders |
| RCF | Routing Control Field |
| RCM | Radar Counter Measures |
| RCS | Radio Command System |
| RCS | Radiocommunication Service |
| RCSS | Random Communications Satellite System |
| RD | Routing Domain (ATM, ISO) |
| RDF | Radio Direction Finder |
| RDF | Route Designator Field |
| RDS | Radio Data System |
| RDSS | Radio Determination Satellite Service |
| RDT | Remote Data Transmitter |
| RDTD | Restricted Differential Time Delay |
| REE | Radio Electronic Equipment |
| RegTP Regulierungsbehörde für Telekommunikation und Post | |
| REM | Ring Error Monitor |
| REN | Ringer Equivalent Number |
| RES | Radio Equipment and Systems |
| RF | Radio Frequency |
| RFA | Random Fixed Access |
| RFCP | Radio Frequency Compatibility Program |
| RFH | Remote Frame Handler (ISDN) |
| RFI | Radio Frequency Interference |
| RIC | RACE Industrial Consortium |
| RIF | Routing Information Field (Source Routing) |
| RII | Routing Information Indicator (Source Routing) |
| RIM | Request Initialisation Mode (HDLC) |
| RIO | Reference Interconnection Offer |
| RIP | Routing Information Protocol |
| RISE | Retrieval and Interchange of Standards in Europe |
| project | |
| RLR | Receive Loudness Rating |
| RLS | Radiolocation Service (Station) |
| RLSD | Receive Line Signal Detector |
| RM | Resource Management |
| RMC | RACE Management Committee |
| RMON | Remote Network Monitoring |
| RNC | Radio Network Control |
| RNF | Receiver Noise Figure |
| RNS | Radio-navigation Service |
| RNSS | Radio-navigation Satellite Service |
| ROH | Receiver Of-Hook |
| ROMP | Remote Operations Microprocessor |
| RoR | Rate of Return |
| ROSE | Remote Operation Service Element (Application Layer) |
| RP | Registration Point |
| RR | The ITU Radio Regulations |
| RPC | Radar Processing Center |
| RPC | Remote Procedure Call |
| RPG | Random Pulse Generator |
| RPM | Random Phase Modulation |
| RPS | Radio-Paging System |
| RPS | Ring Parameter Server |
| RPSK | Relative Phase Shift Keying |
| RRS | Radio Relay Station |
| RS | Remote Station |
| RSB | Residual Sideband |
| RSCV | Route Selection Control Vector |
| RSEMS | Remote Sensing of the Electromagnetic Spectrum |
| RSM | Remote Switching Module (telephony) |
| RSS | Remote Switch Subsystem |
| RT | Real Time |
| RT | Remote Terminal |
| RTC | Radiotelephone Communication |
| RTM | Reference Test Method |
| RTR | Radio Teletype Receiver |
| RTSC | Regional Telematic Service Centre |
| RTSE | Remote Transfer Service Element (Application Layer) |
| RTU | Remote Telemetry Units |
| RXLEV | Received Signal Level |
| RXQUAL | Received Signal Quality |
| S-DAB | Satellite Digital Audio Broadcasting |
| S/N | Signal to Noise ratio |
| SA | Source Address |
| SAACH | Slow Associated Control Channel |
| SAAL | Signaling ATM Adaptation Layer (ATM) |
| SABM | Set Asynchronous Balanced Mode (HDLC) |
| SABME | Set Asynchronous Balanced Mode Extended (HDLC) |
| SAC | Service Access Code |
| SAM | System Administration Module |
| SAMSARS | Satellite-Based Maritime Search and Rescue System |
| SAP | Source Access Point |
| SAPI | Service Access Point Identifier (LAPD) |
| SAR | Segmentation and Reassembly (ATM) |
| SARBE | Search and Rescue Beacon |
| SARM | Set Asynchronous Response Mode (HDLC) |
| SART | Search and Rescue Radar Transponder |
| SAS | Simple Attachment Scheme |
| SAS | Small Astronomical Satellite |
| SATAN | System Administrator Tool for Analysing Networks |
| SBAS | Steerable-Beam Antenna System |
| SBS | Satellite Business System |
| SBSVC | Selective Broadcast Signalling Virtual Channel (B-ISDN) |
| SCA | System Communication Architecture |
| SCADA | Supervisory Control And Data |
| SCAM | Spectrum Characteristics Analysis Measurement |
| SCCP | Signalling Connection Control Part |
| SCE | Service Creation Environment |
| SCEF | Service Creation Environment Function (TMN) |
| SCF | Service Control Function (TMN) |
| SCFM | Subcarrier Frequency Modulation |
| SCFS | Subcarrier Frequency Shift |
| SCP | Service Control Point |
| SCP | Session Control Protocol |
| SCPC | Single Channel per Carrier |
| SCR | Sustained Cell Rate (ATM) |
| SCSI | Small Computer Systems Interface |
| SCVF | Single Channel Voice Frequency |
| SDDS | Satellite Data Distribution System |
| SDF | Specialised Database Functions (TMN) |
| SDF | Spectral Density Function |
| SDH | Synchronous Digital Hierarchy |
| SDK | Software Development Kit |
| SDM | Space Division Multiplexing |
| SDPLL | Sampled Data Phase Locked Loop |
| SDPS | Satellite Data Processing System |
| SDSL | Single-line Digital Subscriber Line |
| SDSL | Symmetric Digital Subscriber Line |
| SDSU | SMDS Data Service Unit |
| SDTS | Satellite Data Transmission System |
| SDU | Service Data Unit |
| SE | Support Equipment (TMN) |
| SEF | Support Entity Function (TMN) |
| SEMKO | Swedish Institute for Testing and Approval of |
| Electrical Equipment | |
| SES | Satellite Earth Stations |
| SEV | Schweizerischer Elektrotechnischer Verein (Swiss Electrotechnical Association) |
| SEWG | Spectrum Engineering Working Group of CEPT ERC |
| SEWS | Satellite Early Warning System |
| SFM | Space Frequency Modulation |
| SFS | Start of Frame Sequence (LAN) |
| SFTS | Standard Frequency and Time Signals |
| SGML | Standard Generalised Markup Language |
| SHF | Super High Frequency |
| SHOSAC | Shore-to-Ship Distress Alerting Channel |
| SI | Statutory Instruments (UK) |
| SIF | Signalling Information Field |
| SIG | Special Interest Group |
| SIM | Subscriber Identity Module |
| SIMD | Single Instruction stream Multiple Data stream |
| SINs | British Telecom Suppliers’ Information Notes |
| SIO | Scientific and Industrial Organisations (ITU-T) |
| SIP | SMDS Interface Protocol |
| SIR | Sustained Information Rate (SMDS) |
| SITA | Société Internationale de Télécommunications Aéronautiques |
| SITS | Special Investigation Test Schedule (UK) |
| SJF | Shortest Job First |
| SKL | Station-Keeping Satellite |
| SLC | Subscriber Loop Carrier |
| SLEE | Service Logic Execution Environment |
| SLPR | Stationless Packet Radio |
| SLR | Send Loudness Rating |
| SLSA | Single Line Switching Apparatus |
| SMAF | Service Management Agent Function (TMN) |
| SMAP | System Management Application Part |
| SMART | Strategy for Mobile Advanced Radio |
| Telecommunications (initiative of DG XIII/D) | |
| SMAX | Satellite Multiple-Access Communication System |
| SMDS | Switched Multimegabit Data Service |
| SMF | Service Management Function (TMN) |
| SMG | Special Mobile Group |
| SMI | Structure of Management Information |
| SMIP | Strategic Management Information Plan |
| SMP | Simple Management Protocol |
| SMP | Switching Module Processor |
| SMR | Specialised Mobile Radio |
| SMRS | Specialized Mobile Radio System |
| SMS | Satellite Multiservice System |
| SMSC | Satellite Mobile Switching Center |
| SMT | Surface Mounting Technology |
| SMTA | Single-line Multi-Extension Telephone Apparatus |
| SMTP | Simple Mail Transfer Protocol |
| SN | Sequence Number (ATM, DQDB, SMDS) |
| SN | Subscriber Number |
| SN | Switching Network (SNA) |
| SNA | Systems Network Architecture |
| SNAP | Subnetwork Access Protocol |
| SNI | Subscriber Network Interface |
| SNL | Satellite Network List |
| SNP | Sequence Number Packet (or Protection) |
| SNRM | Set Normal Response Mode (HDLC) |
| SNRME | Set Normal Response Mode Extended (HDLC) |
| SNT | System Noise Temperature |
| SOGIT | Senior Officials Group for Information Technology |
| SOL | System Oriented Language |
| SONET | Synchronous Optical Network |
| SOS | Space Operation Service |
| SOUP | Spectrum Orbit-Utilization Program |
| SP | Signalling Point (ANSI) |
| SPACS | Satellite Packet Communication System |
| SPADATS | Space Detection and Tracking System |
| SPAG | Standards Promotion and Application Group SA |
| SPAN | Space Communications Network |
| SPARC | Scalable Performance Architecture |
| SPC | Stored Programme Control |
| SPCN | Satellite Personal Communication Network |
| SPDC | Spectral Density |
| SPDU | Session Protocol Data Unit |
| SPID | Service Profile Identifier (ISDN) |
| SPM | Subscriber Private Meter |
| SPOC | Single Point of Contact |
| SPOT | Satellite Positioning and Tracking |
| SPS | Signalling Protocols and Switching |
| SPTN | Single Protocol Transport Network |
| SQFM | Symmetric Quadratic Frequency Modulation |
| SQL | Structured Query Language |
| SQPSK | Shift Quadrature Phase Shift Keying |
| SRAM | Static Random Access Memory |
| SREJ | Selective Reject (HDLC) |
| SRES | Space Research Earth Station |
| SRF | Specialised Resources Function (TMN) |
| SRI | SIP Relay Interface (SMDS) |
| SRT | Source Routing Transparent |
| SRTP | Sequenced Routing Table Protocol |
| SRTS | Synchronous Residual Time Stamp |
| SS7 | Signalling System 7 |
| SS | Spread Spectrum |
| SSAP | Source Service Access Point |
| SSB | Single Side Band |
| SSBM | Single Sideband Modulation |
| SSF | Service Switching Function (TMN) |
| SSM | Single Segment Message (DQDB, SMDS) |
| SSMA | Spread Spectrum Multiple Access |
| SSP | Service Switching Point |
| SSP | Switch-to-Switch Protocol |
| SSS | Subscriber Switching Subsystem |
| SST | Synchronous Service Transport |
| SSWAM | Single Side Wideband Analog Modulation |
| ST | Signalling Terminal |
| STAG | Security Techniques Advisory Group (ETSI) |
| STD | Subscriber Trunk Dialling |
| STDM | Statistical Time Division Multiplexing |
| STE | Signallling Terminal Equipment |
| STE | Spanning-Tree Explorer (LAN) |
| STEM | Strategic Telecommunication Evaluation Model |
| STES | Small Transportable Earth Station |
| STM | Synchronous Transfer Mode |
| STMR | Sidetone Masked Loudness Rating |
| STP | Signalling Transfer Point |
| STRATSAT | Strategic Satellite System |
| STS | Synchronous Transport Signal (SONET) |
| SVC | Signalling Virtual Channel (ATM) |
| SVC | Switched Virtual Circuit (Packet Switching) |
| SYNTRAN | Synchronous Transmission |
| T-DAB | Terrestrial Digital Audio Broadcasting |
| TD-CDMA | Time Division Code Division Multiple Access |
| TA | Terminal Adapter (ISDN) |
| TAC | Telecommunications Administrations Centre (Finland) |
| TACS | Total Access Communications Systems |
| TAPI | Telephony API |
| TARM | Telephone Answering and Recording Machine |
| TASI | Time Assigned Speech Interpolation |
| TB | Transparent Bridging |
| TBB | Trans-national Broadband Backbone |
| TBR | Technical Basis for Regulation (ETSI) |
| TC | Transmission Control |
| TC | Transport Connection |
| TCAM | Telecommunications Access Method (SNA) |
| TCAP | Transaction Capabilities Application Part |
| TCIF | Telecommunications Industry Forum |
| TCM | Time Compression Multiplexing |
| TCP | Transmission Control Protocol |
| TCP/IP | Transmission Control Protocol/Internet Protocol |
| TCU | Telecommunications Control Unit (SNA) |
| TCU | Trunk Coupling Unit |
| TDCP | Time Division Circular Polarization |
| TDD | Time Division Duplexing |
| TDDN | Time-Division Digital Network |
| TDF | Time Division Filtering |
| TDM | Time Division Multiplexing |
| TDMA | Time Division Multiple Access |
| TDMS | Time Division Multiplex System or Transmission |
| Distortion Measuring Set | |
| TDRS | Tracking and Data Relay Satellite |
| TDS | Time Division Switching |
| TE | Terminal Equipment |
| TEDIS | Trade Electronic Data Interchange Systems |
| TEI | Terminal Endpoing Identifier (LAPD) |
| TELCO | The generic name of telephone companies |
| throughout the world encompasses RBOC’s LEC’s | |
| and PTT’s | |
| TES | Transportable Earth Station |
| TETRA | Trans European Trunked Radio |
| TFD | Time and Frequency Dissemination |
| TFTS | Terrestrial Flight Telephone System |
| TGCS | Transportable Ground Communications Station |
| TIA | Telecommunications Industry Association (UK) |
| TIG | Terminal Interoperability Group |
| TIM | Transmitter Intermodulation |
| TINA | Telecommunications Information Networking Architecture |
| TIS | Technical Information Sheets ( UK) |
| TJF | Test Jack Frame |
| TLD | Top-Level Domain |
| TLH | Transport Layer Header |
| TLP | Transmission Level Point |
| TLS | Transparent LAN Service |
| TM | Terminal Multiplexer |
| TM | Transmission and Multiplexing |
| TMA | Telecommunication Managers Association (UK) |
| TMN | Telecommunications Management Network |
| TMS | Time-Multiplexed Switch |
| TMSI | Temporary Mobile Subscriber Identity |
| TMTI | Temporary Mobile Terminal Identity |
| TMUI | Temporary Mobile User Identity |
| TOPS | Traffic Operator Position System |
| ToR | Terms of Reference |
| TP | Transaction Processing |
| TP | Transport Protocol (ISO) |
| TP | Twisted Pair |
| TPAU | Twisted Pair Attachment Unit |
| TPDU | Transport Protocol Data Unit |
| TPMR | Trunk Private Mobile Radio |
| TR | Token Ring |
| TRA | Traffic Routing Administration |
| TRAC | Technical Recommendations Application Committee |
| TRAPI | Transport API |
| TRAU | Transcoder and Rate Adaption Unit |
| TSAP | Transport Service Access Point |
| TSC | Transit Switching Centre |
| TSM | Time Switch Module |
| TSRM | Telecommunication Standards Reference Manual |
| TSRRS | Tropospheric Scatter Radio-Relay System |
| TSS | Telecommunication Standardisation Sector (ITU-T) |
| TSS | Trunk and Signalling Subsystem |
| TTL | Time to Live (Internet) |
| TTP | Trial Termination Point (TMN) |
| TTRS | Transportable Transmit and Receive Station |
| TUA | Telecommunications Users Association (UK) |
| TUG | Telecommunication User Group |
| TWA | Two-Way Alternate (HDLC) |
| TWS | Two-Way Simultaneous (HDLC) |
| UA | Unbalanced Asynchronous (HDLC) |
| UA | Unnumbered Acknowledgement (HDLC) |
| UAN | User Access Node |
| UART | Universal Asynchronous Receiver Transmitter |
| UBR | Unspecified Bit Rate (ATM) |
| UCA | Utility Communications Architecture |
| UCD | Uniform Call Distribution |
| UCS | Universal Communications Standards |
| UDI | Unrestricted Digital Information (ISDN) |
| UDP | User Datagram Protocol |
| UET | Unattended Earth Terminal |
| UHF | Ultra High Frequency (within the range of |
| 300-3000MHz) | |
| UI | Unnumbered Information (HDLC) |
| UISG | Utility Industry Standards Group |
| UITS | Unacknowledged Information Transfer Sercice |
| (ITU-T) | |
| ULL | Unbundling the Local Loop |
| UMB | Upper Memory Block |
| UMS | Unmanned Multifunction Satellite |
| UMTS | Universal Mobile Telecommunications Systems |
| UN | Unbalanced Normal |
| UNITE | User Network for Information exchange on |
| Telecommunications in Europe | |
| UNMA | Unified Network Management Architecture |
| UOS | Unmanned Orbital Satellite |
| UP | Unnumbered Poll |
| UPC | Usage Parameter Control (ATM) |
| UPCS | Universal Personal Communications Services |
| UPS | Uninterruptable Power Supply |
| UPT | Universal Personal Telecommunications |
| UPTAA | UPT Access Address |
| UPTAC | UPT Access Code |
| URL | Uniform Resource Locator |
| URM | Usage Reference Model |
| USART | Universal Synchronous Asynchronous Receiver |
| Transmitter | |
| USAT | Ultra Small Aperture Terminal |
| USB | Universal Serial Bus |
| USC | Universal Service Contribution |
| USO | Universal Service Obligation |
| USP | Universal Service Provider |
| USRT | Universal Synchronous Receiver/Transmitter |
| UTP | Unshielded Twisted pair (Physical Layer) |
| UTRA | Universal Terrestrial Radio Access |
| UUS | User to User Signalling |
| UWB | Ultra-Wideband |
| VADS | Value Added Data Services |
| VANS | Value Added Network Services |
| VAP | Value-Added Process |
| VAS | Value Added Services |
| VBNS | Very High Speed Backbone Network Service |
| VBR | Variable Bit Rate (ATM) |
| VBR-NRT | Variable Bit Rate-Non-Real-Time (ATM) |
| VBR-RT | Variable Bit Rate-Real-Time (ATM) |
| VC | Virtual Channel (ATM) |
| VC | Virtual Circuit (PSN) |
| VC | Virtual Container (SDH) |
| VCC | Virtual Channel Connection (ATM) |
| VCS | Virtual Circuit Switch |
| VDE | Verein Deutscher Elektroingenieure (Society of |
| German Electrical Engineers) | |
| VDSL | Very High-speed Digital Subscriber Line |
| VDT | Visual Display Terminal |
| VDU | Visual Display Unit |
| VEWS | Very Early Warning System |
| VF | Voice Frequency |
| VHDSL | Very High bit rate Digital Subscriber Line |
| VHE | Virtual Home Environment |
| VHF | Very High Frequency (within the range |
| 30-300MHz) | |
| VI | Vector Identifier |
| VIP | VINES Internet Protocol |
| VL | Vector Length |
| VLAN | Vitual LAN |
| VLBI | Very Long Baseline Interferometry |
| VLBR | Very Low Bit Rate |
| VLF | Very Low Frequency |
| VLR | Visitor Location Register |
| VLSI | Very Large Scale Integration |
| VM | Virtual Machine |
| VMS | Voice Messaging System |
| VNS | Vehicle Navigation System |
| VP | Virtual Path |
| VPC | Virtual Path Connection |
| VPDN | Virtual Private Data Network |
| VPI | Virtual Path Identifier |
| VPLMN | Visited Public Land Mobile Network |
| VPN | Virtual Private Networks |
| VRC | Vertical Redundancy Check |
| VSA | Vector Signal Analyser |
| VSAM | Virtual Storage Access Method |
| VSAT | Very Small Aperture Terminal |
| VSB | Vestiginal Sideband |
| VT | Virtual Terminal (ISO) |
| VTE | Virtual Terminal Environment |
| VTOA | Voice and Telephony Over ATM |
| VTP | Virtual Terminal Protocol (ISO) |
| WACS | Wireless Access Communications System |
| WAIS | Wide Area Information Services |
| WAN | Wide Area Network |
| WAP | Wireless Application Protcol |
| WARC | World Administration Radio Conference |
| WATS | Wide Area Telecommunications Service |
| WB/BB | Wideband/Broadband |
| WBDTS | Wide Band Data Transmission System |
| WBFM | Wideband Frequency Modulation |
| WBT | Wideband Transmitter |
| WDM | Wavelength Division Multiplex |
| WIN | Wireless Intelligent Network |
| Winsock | Windows socket API |
| WLAN | Wireless Local Area Network |
| WLL | Wireless in the Local Loop |
| WLL | Wireless Local Loop. |
| WM | Wireless Manager |
| WPBX | Wireless Private Branch Exchange |
| WPR | Wind Profiler Radar |
| WRC | World Radio Conference |
| WS | Work Station |
| WSF | Work Station Function Block (TMN) |
| WT | Wireless Transceiver |
| WWW | World Wide Web (IETF) |
| XA | Exchange Access (SMDS) |
| XDF | Extended Distance Feature |
| XDSL | X-Type Digital Subscriber Line |
| XID | Exchange Identification (HDLC) |
| XMS | Extended Memory Specification |
| XPD | Atmospheric Depolarization Effect |
| YIG | Yttrium Iron Garnet |
| ZBTSI | Zero Byte Times Slot Interchange |
| ZCS | Zero Code Suppression |
| ZIS | Zone Information Socket |
| ZIT | Zone Information Table |
| ZNIIS | Central Research Telecommunication Institute Russia |
| ZST | Zone Standard Time |
Fonte: http://www.pec-forum.com/novita/Dizionario_acronimi.xls
Sito web da visitare: http://www.pec-forum.com/
Autore del testo: non indicato nel documento di origine
Parola chiave google : Acronimi ed abbreviazioni nelle Telecomunicazioni tipo file : doc
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Acronimi ed abbreviazioni nelle Telecomunicazioni
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