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ITU-T H.130 Frame structures for use in the international interconnection of digital codecs for videoconferencing or visual telephony
ITU-T R.50 Tolerable limits for the degree of isochronous distortion of code-independent 50-baud telegraph circuits
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 S.3 Transmission characteristics of the local end with its termination (ITA2)
ITU-T G.753 Third order digital multiplex equipment operating at 34 368 kbit/s and using positive/zero/negative justification
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
ITU-T J.14 Relative levels and impedances on an international sound-programme connection
ITU-T R.57 Standard limits of transmission quality for planning code-independent international point-to-point telegraph communications and switched networks using 50-baud start-stop equipment
ITU-T U.31 Prevention of connection to faulty stations and/or station lines in the gentex service