D: General tariff principles E: work operation, telephone service, service operation and human factors F: Non-telephone munication services G: Transmission systems and media, digital systems works H: Audiovisual and multimedia systems I: Integrated services work J: works 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: munication management, including TMN work maintenance N: Maintenance: international sound programme and television transmission circuits O: Specifications of measuring equipment P: Terminals and subjective and objective assessment methods Q: Switching and signalling R: Tele
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