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ITU-T H.110 Hypothetical reference connections for videoconferencing using primary digital group transmission
ITU-T U.21 Operator recall on a telex call set up on a radiotelegraph circuit
ITU-T N.73 Maintenance of permanent international television circuits, links and connections
ITU-T G.744 Second order PCM multiplex equipment operating at 8448 kbit/s
ITU-T R.120 Tolerable limits for the degree of isochronous distortion of code-independent telegraph circuits operating at modulation rates of 75, 100 and 200 bauds
ITU-T S.2 Coding scheme using International Telegraph Alphabet No. 2 (ITA2) to allow the transmission of capital and small letters