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ITU-T V.28 Electrical characteristics for unbalanced double-current interchange circuits
ITU-T V.32 A family of 2-wire, duplex modems operating at data signalling rates of up to 9600 bit/s for use on the general switched telephone network and on leased telephone-type circuits
ITU-T Z.351 Data oriented human-machine interface specification technique - Introduction
ITU-T D.178 Monthly accounts for semi-automatic telephone calls (ordinary and urgent calls, with or without special facilities)
ITU-T E.452 Facsimile modem speed reductions and transaction time
ITU-T E.600 Terms and definitions of traffic engineering
ITU-T E.770 Land mobile and fixed network interconnection traffic grade of service concept
ITU-T H.120 Codecs for videoconferencing using primary digital group transmission
ITU-T G.701 Vocabulary of digital transmission and multiplexing, and pulse code modulation (PCM) terms
ITU-T G.736 Characteristics of a synchronous digital multiplex equipment operating at 2048 kbit/s
ITU-T I.232.3 Packet-mode bearer services categories : User signalling bearer service category (USBS)