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ITU-T N.63 Test signals to be used by the broadcasting organizations during the preparatory period
ITU-T G.742 Second order digital multiplex equipment operating at 8448 kbit/s and using positive justification
ITU-T T.71 Link access protocol balanced (LAPB) extended for half-duplex physical level facility
ITU-T R.103 Code and speed-dependant TDM 600 bit/s system for use in point-to-point or branch-line muldex configurations
ITU-T R.140 Definitions of essential technical terms in the field of telegraph transmission
ITU-T G.602 Reliability and availability of analogue cable transmission systems and associated equipment
ITU-T J.11 Hypothetical reference circuits for sound-programme transmissions
ITU-T R.51bis Standardized text for testing the elements of a complete circuit
ITU-T U.24 Requirements for telex and gentex operation to be met by synchronous multiplex equipment described in recommendation R.44
ITU-T Q.2 Signal receivers for automatic and semi-automatic working, used for manual working
ITU-T G.747 Second order digital multiplex equipment operating at 6312 kbit/s and multiplexing three tributaries at 2048 kbit/s