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ITU-T S.11 Use of start-stop reperforating equipment for perforated tape retransmission
ITU-T J.42 Characteristics of equipment for the coding of analogue medium quality sound-programme signals for transmission on 384-kbit/s channels
ITU-T Q.116 Indication given to the outgoing operator or calling subscriber in case of an abnormal condition
ITU-T I.231.3 Circuit-mode bearer service categories : Circuit-mode 64 kbit/s, 8 kHz structured bearer service usable for 3.1 kHz audio information transfer
ITU-T K.8 Separation in the soil between telecommunication cables and earthing system of power facilities