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A Organization of the work of ITU-TB Means of expression: definitions, symbols, classificationC General telecommunication statisticsD General tariff principlesE Overall network operation, telephone service, service operation and human factorsF Non-telephone telecommunication servicesG Transmission systems and media, digital systems and networksH Audiovisual and multimedia systemsI Integrated services digital networkJ Cable networks and transmission of television, sound programme and other multimedia signalsK Protection against interferenceL Construction, installation and protection of cables and other elements of outside plantM TMN and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits
N Maintenance: international sound programme and television transmission circuitsO Specifications of measuring equipmentP Terminals and subjective and objective assessment methodsQ Switching and signallingR Telegraph transmissionS Telegraph services terminal equipmentT Terminals for telematic servicesU Telegraph switchingV Data communication over the telephone networkX Data networks and open system communicationsY Global information infrastructure and Internet protocol aspectsZ Languages and general software aspects for telecommunication systems
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NB. An amendment/corrigendum has been issued in 2018 and can be accessed below.
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