A Organization of the work of ITU-T B Means of expression: definitions, symbols, classification C General telecommunication statistics D General tariff principles E Overall network operation, telephone service, service operation and human factors F Non-telephone telecommunication services G Transmission systems and media, digital systems and networks H Audiovisual and multimedia systems I Integrated services digital network J Cable networks and transmission of television, sound programme and other multimedia signals K Protection against interference L Construction, installation and protection of cables and other elements of outside plant M TMN and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits |
| N Maintenance: international sound programme and television transmission circuits O Specifications of measuring equipment P Telephone transmission quality, telephone installations, local line networks Q Switching and signalling R Telegraph transmission S Telegraph services terminal equipment T Terminals for telematic services U Telegraph switching V Data communication over the telephone network X Data networks and open system communications Y Global information infrastructure and Internet protocol aspects Z Languages and general software aspects for telecommunication systems |
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