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ITU-T G.741 General considerations on second order multiplex equipments
ITU-T O.163 Equipment to perform in-service monitoring on 1544 kbit/s signals
ITU-T R.91 General maintenance aspects for the maritime satellite telex service
ITU-T L.5 Cable sheaths made of metals other than lead or aluminium
ITU-T Q.80 Introduction to stage 2 service descriptions for supplementary services
ITU-T U.23 Use of radiotelegraph circuits with ARQ equipment for fully automatic telex calls charged on the basis of elapsed time
ITU-T G.746 Characteristics of second order PCM multiplex equipment operating at 6312 kbit/s
ITU-T T.330 Telematic access to interpersonal messaging system
ITU-T R.122 Summary of transmission plans for rates up to 300 bauds