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ITU-T G.745 Second order digital multiplex equipment operating at 8448 kbit/s and using positive/zero/negative justification
ITU-T R.121 Standard limits of transmission quality for start-stop user classes of service 1 and 2 on anisochronous data networks
ITU-T H.130 Frame structures for use in the international interconnection of digital codecs for videoconferencing or visual telephony
ITU-T U.22 Signals indicating delay in transmission on calls set up by means of synchronous systems with automatic error correction by repetition
ITU-T R.50 Tolerable limits for the degree of isochronous distortion of code-independent 50-baud telegraph circuits
ITU-T G.753 Third order digital multiplex equipment operating at 34 368 kbit/s and using positive/zero/negative justification
ITU-T S.3 Transmission characteristics of the local end with its termination (ITA2)
ITU-T G.613 Characteristics of symmetric cable pairs usable wholly for the transmission of digital systems with a bit rate of up to 2 Mbit/s