| FPLMTS | Future Public Land Mobile Telecommunications System |
| IMT | International Mobile Telecommunications |
| FTS | Federal Telecommunications System |
| MES | Mobile End System |
| WITS | Washington Interagency Telecommunications System |
| MBS | Mobile Broadband System |
| UFS | Universal File System |
| GSM | Global System for Mobile Communications |
| MDIS | Mobile Data Intermediate System |
| USSA | Universal Storage System Architecture |
| UFS | Universal / UNIX File System |
| UFIS | Universal Flight Information System |
| DATEL | Data Telecommunications |
| TELNET | Telecommunications Network |
| TIA | Telecommunications Industries Association int. Unternehmensverband in der Telekommunikation und Datentechnik |
| TCIF | Telecommunications Industry Forum, USA |
| ITS | International Telecommunications Society Calgary, [CAN], http://www.itsworld.org |
| MPT | Ministry of Post and Telecommunications |
| UIT | Union Internationale des Telecommunications |
| ITC | international telecommunications convention vgl. Genf, http://www.itu.int |
| TRA | Telecommunications Research Associates |
| DGT | Direction Generale des Telecommunications |
| ACTE | Approval Committee for Telecommunications Zulassungsausschuss für Telekommunikationsendeinrichtungen |
| NTC | National Telecommunications Conference |
| RTM | Regional Telecommunications Management |
| TSS | Telecommunications Standardisation Sector [ITU] |
| CTD | Computing and Telecommunications Division |
| MPT | Ministry of Posts and Telecommunications |
| TRE | Telecommunications Research Establishment |
| TCA | Telecommunications Carrier Association |
| CSTA | Computer Supported Telecommunications Applications |
| DELTA | Distributed ELectronic Telecommunications Archive |
| INTELSAT | International Telecommunications Satellite Organization Heute Teil von PanAmSat, http://www.panamsat.com |
| INTUG | International Telecommunications Users Group Den Haag, http://www.intug.net |
| ATP | Advanced Telecommunications Program [engl.] |
| JUST | Joint Users of Siemens Telecommunications |
| IPTC | International Press Telecommunications Council |
| ART | Autorite de Regulation des Telecommunications [engl.] |
| ATN | Aeronautical Telecommunications Network [engl.] |
| RATS | Radio Amateur Telecommunications Society |
| NCTL | National Computer and Telecommunications Laboratory |
| RNRT | Reseau National de Recherche en Telecommunications |
| NTIA | National Telecommunications and Information Administration Washington, DC, http://www.ntia.doc.gov |
| TRAC | Telecommunications Recommendations Application Committee |
| NTTF | Networking and Telecommunications Task Force |
| DCTN | Defense Commercial Telecommunications Network |
| CTOS | Corporate Telecommunications and Office Systems |
| CTIA | Cellular Telecommunications Industry Association |
| INTELSAT | International Telecommunications Satellite Consortium Heute Teil von PanAmSat, http://www.panamsat.com |
| ILETS | International Law Enforcement Telecommunications Seminar |