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ITU-T G.612 Characteristics of symmetric cable pairs designed for the transmission of systems with bit rates of the order of 6 to 34 Mbit/s
ITU-T R.53 Permissible limits for the degree of distortion on an international 50-baud/120-Hz VFT channel (frequency and amplitude modulation)
ITU-T U.30 Signalling conditions for use in the international gentex network
ITU-T E.144/Q.5 Advantages of semi-automatic service in the international telephone service
ITU-T G.752 Characteristics of digital multiplex equipments based on a second order bit rate of 6312 kbit/s and using positive justification
ITU-T J.23 Performance characteristics of 7 kHz type (narrow bandwidth) sound-programme circuits