| Acronym | Sense | Language | Topics |
|---|---|---|---|
| BTRC | Belaruskaja Tele-Radio Campanija | In Russian | |
| BTRC | Bluetooth Remote Control | In English | |
| BTS | Base Transceiver Station | In English | |
| BUPT | Beijing University of Posts and Telecommunications (https://www.bupt.edu.cn/) | In English | → Higher education, universities → Transport and postal services → China |
| C&W | Cable & Wireless | In English | → Networks, communication |
| C2T | Cable Connect Technology | In English | → Networks, communication |
| C3 | Command and Control Communications | In English | → Military affairs |
| CADH | Communications and Data Handling | In English | → Data processing |
| CAETI | Centre d'Alta Especialització en Tecnologies de la Informació | In Spanish | → Computer science |
| CAMEL | Customized Applications for Mobile networks Enhanced Logic | In English | → Networks, communication |
| CAP | Carrierless Amplitude Phase | In English | |
| CAPS | Call Attempts Per Second | In English | |
| CAS | Channel Associated Signaling | In English | |
| CATV | Cable Television | In English | |
| CATV | Community Antenna Television | In English | |
| CAUCE | Coalition Against Unsolicited Commercial Email | In English | → Organizations and associations → Networks, communication |
| CBC | Cyprus Broadcasting Corporation (www.cybc.com.cy) = ΡIK | Ραδιοφωνικό Ίδρυμα Κύπρου | In Greek = RIK | Radiofoniko Idryma Kyprou | In Greek |
In English | |
| CC | Communications Control | In English | |
| CCARES | Culver City Amateur Radio Emergency Service | In English | |
| CCBS | Call Completion on Busy Subscriber | In English | |
| CCC | Communication Control Center | In English | |
| CCCH | Common Control Channel | In English | |
| CCCPA | Convention Collective de la Communication et de la Production Audiovisuelles | In French | → Labour, labour economics → 659 |
| CCIR | International Radio Consultative Committee | In English | → Organizations and associations |
| CCITT | Comité Consultatif International pour le Téléphone et le Télégraphe | In French | → Organizations and associations |
| CCITT | Certification for IT&T | In English | → Networks, communication |
| CCITT | Comité Consultatif Tnternational Télégraphique et Téléphonique | In French | → Organizations and associations |
| CCR | Commission Consultative des Radiocommunications | In English | → Organizations and associations |
| CCS | Command and Communication System | In English | |
| CCS | Console Communication System | In English | |
| CCS7 | Common Channel Signalling System 7 | In English | → Networks, communication |
| CCSC | Computer and Communications Security Center | In English | → Computer science |
| CCSD | Collins Communications Systems Division | In English | |
| CCSR | Centre for Communication Systems Research | In English | → Research institutes |
| ccTLD | Country code Top Level Domain | In English | → Networks, communication |
| CCTS | Call Center Test System | In English | |
| CCTV | Closed-Circuit Television | In English | |
| CCU | Communications Carrier Umbilical | In English | |
| CCU | Communications Carrier Unit | In English | |
| CCU | Crew Communications Unit | In English | |
| CCU | Crewman Communications Umbilical | In English | |
| CDC | Collins Defense Communications | In English | → Networks, communication → Military affairs |
| CDCD | Collins Defense Communications Division | In English | → Military affairs |
| CDMA | Code Division Multiple Access = AMRC | Accès Multiple par Répartition en Code | In French |
In English | |
| CDNT | Centre Droit et Nouvelles Technologies | In French | → Law, jurisprudence |
| CDPD | Cellular Digital Packet Data | In English | → Data |
| CECB | Coupon-Eligible Converter Box | In English | |
| CEDIA | Consorcio Ecuatoriano para el Desarrollo de Internet Avanzado | In Spanish | → Internet → Organizations and associations |
| CENTACS | Center for Tactical Communications Systems | In English | → Military engineering |
| CENTIC | Centro de Tecnologías de Información y Comunicación (www.centic.es) | In Spanish | → Computer science → Spain |
| CePIT | Centar za Proučavanje Informacionih Tehnologija | In Serbian | |
| CEPT | Conférence Européenne des Postes et Télécommunications (www.cept.org) | In French | → Organizations and associations → Transport and postal services |
| CESIA | Centre d'Études des Systèmes d'Information des Administrations | In French | → Computer science → Public administration, government |
| CESTEL | Centro Español de Servicios Telemáticos (www.cestel.es) | In Spanish | → Computer science → Spain |
| CETELIC | Centre de Traitement Électronique Intercaisses | In French | → Computer-based techniques |
| CETIC | Centre d’Excellence en Technologies de l’Information et de la Communication (www.cetic.be) | In French | → Computer science |
| CFI | Canal France international | In French | → France |
| CGCT | Compagnie Générale de Constructions Téléphoniques | In French | |
| CGI | Cell Global Identity | In English | |
| CGTI | Conseil Général des Technologies de l'Information | In French | → Computer science |
| CHAP | Challenge Handshake Authentication Protocol | In English | |
| CHTML | Compact HyperText Markup Language | In English | → Programming languages |
| CI | Cell Identity | In English | |
| CICOM | Carrefour International de la Communication | In French | → Transport and postal services |
| CIDT | Centre de Développement des Technologies de l'Information | In French | → Computer science |
| CIE | Communications Interface Equipment | In English | → Human-computer interaction |
| CIG | Communications and Interface Group | In English | → Human-computer interaction |
| CIP | Communications Interface Processor | In English | → Human-computer interaction |
| CIRT | Compagnie Internationale de Radiodiffusion et de la Télévision | In French | |
| CISI | Comité Interministériel pour la Société de l'Information | In French | → Central administration → Computer science |
| CISR | Comité Interministériel de la Sécurité Routière | In French | → Central administration |
| CISS | Call Independent Supplementary Services | In English | |
| CIT | Computing & Information Technology | In English | → Computer science |
| CITEL | Comisión Interamericana de Telecomunicaciones = CITEL | Commission Interaméricaine des Télécommunications | In French = CITEL | Comissão Interamericana de Telecomunicações | In Portuguese |
In Spanish | → Organizations and associations |
| CITEL | Commission Interaméricaine des Télécommunications = (look above) |
In French | → Organizations and associations |
| CITEL | Comissão Interamericana de Telecomunicações = (look above) |
In Portuguese | → Organizations and associations |
| CITI | Centre d'Innovation en Télécommunications et Intégration de services | In French | → Research institutes |
| CITIC | Centro Andaluz de Innovación y Tecnologías de la Información y las Comunicaciones (www.citic.es) | In Spanish | → Research institutes → Computer science → Spain |
| CITS | Croatian Information Technology Society | In English | → Organizations and associations → Computer science |
| CIU | Communication Interface Unit | In English | → Human-computer interaction |
| CLIP | Calling Number Identification Presentation | In English | |
| CLIR | Calling Number Identification Restriction | In English | |
| CLMS | Connectionless Message Service | In English | |
| CMRA | California Microwave Relay Association | In English | → Associations → United States |
| CMTS | Cable Modem Termination System | In English | → Networks, communication |
| CNCL | Commission Nationale de la Communication et des Libertés | In French | → Politics |
| CNET | Centre National d'Études des Télécommunications | In French | |
| CNIT | Consorzio Nazionale Interuniversitario per le Telecomunicazioni | In Italian | → Higher education, universities |
| CNRA | Conseil National des Radios Associatives | In French | → Organizations and associations |
| CNRL | Communications and Navigation Research Laboratory | In English | → Research institutes |
| CNS | Communication Network Systems | In English | → Networks, communication |
| CNSA | Contact Network of Spam Authorities | In English | |
| CNT | Caisse Nationale des Télécommunications | In French | |
| COAR | City of Orange Amateur Radio | In English | |
| COB | Communications Office Building | In English | |
| COFDM | Coded Orthogonal Frequency-Division Multiplexing | In English | → Computer science |
| COGECOM | Compagnie Générale de Communications | In French | |
| COGITO | Convergence des Outils de Gestion de l'Informatique et Télécoms des Opérateurs | In French | → Computer science |
| ComBr | Communication Broadcasting | In English | → Serial publications, periodicals |
| ComRv | (The) Communication Review | In English | → Serial publications, periodicals |
| COMS | Connection Oriented Message Service | In English | |
| COMSAT | Communications Satellite | In English | → Astronautics |
| ComSo | Communications Society | In English | → Organizations and associations |
| CONATEL | Consejo Nacional de Telecomunicaciones | In Spanish | → Organizations and associations |
| COSMOS | COmputer System for Main frame OperationS | In English | → Computer science |
| CP | Communication Processor | In English | → Computer hardware |
| CPARC | Cal Poly Amateur Radio Club | In English | → Organizations and associations |
| CPB | Corporation for Public Broadcasting (www.cpb.org) | In English | → Organizations and associations |
| CPL | Courant Porteur en Ligne | In French | → Electrical engineering |
| CPNEF/AV | Commission Paritaire Nationale de l'Emploi et de la Formation dans l'Audiovisuel | In French | → Labour, labour economics → Cinema, movies |
| CPRA | California Public Safety Radio Association | In English | → Associations → United States |
| CPS | Cambridge Positioning System | In English | → United Kingdom |
| CPT | Cita Previa Telefónica | In Spanish | |
| ČR | Český Rozhlas (www.rozhlas.cz) | In Czech | → Czech Republic |
| CRAL | Coordination des Radios locales Associatives de Lorraine | In French | → Organizations and associations |
| CRC | Cyclic Redundancy Check | In English | → Data → Networks, communication |
| CREATIS | Centre de Recherche et d'Applications en Traitement de l'Image et du Signal (www.creatis.univ-lyon1.fr) | In French | → Research institutes → Image processing → France |
| ĈRI | Ĉina Radio Internacia | In Esperanto | |
| CRL | Communication Research Laboratory | In English | → Research institutes |
| CRL | Communications Research Laboratory | In English | → Research institutes |
| CRT | Cathode Ray Tube | In English | → Electronics |
| CRTV | Cameroon Radio and Television (www.crtv.cm) | In English | |
| CS | Communications System | In English | |
| CSA | Conseil Supérieur de l'Audiovisuel | In French | → Organizations and associations → Cinema, movies |
| CSCA | Conseil Supérieur de la Communication Audiovisuelle | In French | → Organizations and associations |
| CSCSAT | Commercial Synchronous Communication Satellite | In English | → Astronautics |
| CSE | Communications Systems Engineer | In English | |
| CSE | Communications Security Establishment = CST | Centre de la Sécurité des Télécommunications | In French |
In English | |
| CSEE | Compagnie de Signaux et d'Entreprises Électriques | In French | → Electrical engineering |
| CSMA/CD | Carrier Sense Multiple Access with Collision Detection | In English | |
| CSSP | Circuits Systems and Signal Processing | In English | → Serial publications, periodicals |
| CST | Centre de la Sécurité des Télécommunications = CSE (look above) |
In French | |
| CSTI | Conseil Stratégique des Technologies de l'Information | In French | → Organizations and associations → Computer science |
| ČT | Česká Televize (www.ceskatelevize.cz) | In Czech | → Czech Republic |
| CT | Centre de Transit | In French | |
| ČT2 | Česká Televize 2 | In Czech | → Entertainment |
| CTCSS | Continuous Tone-Coded Squelch System | In English | |
| CTEU | Centre de Télé-Enseignement Universitaire | In French | → Higher education, universities |
| CTI | Computer Telephony Integration | In English | → Computer science |
| CTI | Couplage Téléphonie Informatique | In French | → Computer science |
| CTI | Centre de Téléphonie Integrée | In French | |
| CTIA | Cellular Telecommunications Industry Association (www.ctia.org) | In English | → Associations |
| CTIT | Centrum voor Telematica en Informatica Technologie | In Dutch | → Computer science |
| CTIT | Centrum voor Telematica en Informatietechnologie | In Dutch | → Research institutes → Computer science |
| CTM | Cordless Terminal Mobility | In English | |
| CTS | Comprehensive Transponder Systems | In English | |
| CTS | Communications Technology Satellite | In English | → Astronautics |
| CTSB | Community Television of the Southern Berkshires (www.ctsbtv.org) | In English | |
| CUDI | Corporación Universitaria para el Desarrollo de Internet | In Spanish | → Computer science → Internet |
| CVC | Centrum voor Vaktaal en Communicatie | In Dutch | → Research institutes → Language, linguistics, literature |
| CWDM | Coarse Wavelength Division Multiplexing | In English | → Networks, communication |
| DAB | Digital Audio Broadcasting | In English | |
| DAC | Direction de l'Approvisionnement en Communications | In French | |
| DAMA | Demand Assigned Multiple Access | In English | → Astronautics |
| DARC | Deutscher Amateur-Radio-Club | In German | → Organizations and associations |
| DCA | Defense Communications Agency | In English | → Military affairs |
| DCA | Defense Communication Agency | In English | → Military affairs |
| DCE | Data Circuit-terminating Equipment | In English | → Computer hardware → Data |
| DCE | Data Communication Equipment | In English | → Computer hardware → Data |
| DCL | Direct Communications Link | In English | |
| DCS | Defense Communications System | In English | → Military affairs |
| DCS | Digital-Coded Squelch | In English | |
| DCS | Digital Cellular System | In English | |
| DCTN | Defense Commercial Telecommunications Network | In English | → Military affairs |
| DDN | Defense Data Network | In English | → Networks, communication → Military affairs |
| DDP | Disc Description Protocol | In English | → Cinema, movies |
| DECT | Digital Enhanced Cordless Telecommunications | In English | |
| DECT | Digital Enhanced Cordless Telecommunication | In English | |
| DECT | Digital European Cordless Telephone | In English | |
| DEMOSTEINE | Dispositif EDF de Messagerie Orale par Serveur TÉléphonique lors d'INcidents Électriques | In French | → Electrical engineering |
| DFA | Deutsche Fernsehnachrichten Agentur (www.dfa.de) | In German | → Newspapers, journalism → Germany |
| DGT | Direction Générale des Télécommunications | In French | → Central administration |
| DHS | Département Hyperfréquences et Semiconducteurs | In French | → Electronics |
| DIIC | Departamento de Ingeniería de la Información y las Comunicaciones | In Spanish | → Computer science |
| DImTe | Display Imaging Technology | In English | → Serial publications, periodicals |
| DIT | Direction Informatique et Télécommunications | In French | → Computer science |
| DITEN | Délégation Informatique et Télécommunications de la Branche Énergies | In French | → Computer science → Energy economics |
| DIVX | Digital Video Experience | In English | |
| DMT | Discrete MultiTone Modulation | In English | |
| DMTF | Dual-Tone Multi-Frequency | In English | |
| DORIS | Determination of Orbit Radio Positioning Integrated from Shuttle | In English | → Astronautics |
| DOT | Department of Telecommunications | In English | → Central administration |
| DPCL | Dedicated Payload Communication Link | In English | → Astronautics |
| DPDM | Differential Pulse-Duration Modulation | In English | |
| DQR | Disjoint Queuing Region | In English | |
| DR | Danmarks Radio (www.dr.dk) | In Danish | → Denmark |
| DRCP | Dynamic Registration and Configuration Protocol | In English | → Networks, communication |
| DRF | Digital Radio Frequency | In English | |
| DRS | Data Relay Station | In English | → Data |
| DSC | Dedicated Signal Conditioner | In English | |
| DSC | DECT Standard Cipher | In English | |
| DSCP | Differentiated Services Code Point | In English | → Networks, communication |
| DSLAM | Digital Subscriber Line Access Multiplexer | In English | |
| DSN | Defense Switched Network | In English | → Networks, communication → Military affairs |
| DSP | Digital Signal Processing | In English | → Computer-based techniques |
| DSRC | Dedicated Short Range Communications | In English | |
| DTA | Digital Terminals & Access | In English | → Human-computer interaction |
| DTE | Data Transmission Equipment | In English | → Data |
| DTE | Digital Television Equipment | In English | |
| DTG | Digital Terrestrial Group | In English |