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ITU-T R.51 Standardized text for distortion testing of the code-independent elements of a complete circuit
ITU-T R.58 Standard limits of transmission quality for the gentex and telex service
ITU-T Q.7 Signalling systems to be used for international automatic and semi-automatic telephone working
ITU-T U.41 Changed address interception and call redirection in the telex service
ITU-T G.754 Fourth order digital multiplex equipment operating at 139 264 kbit/s and using positive/zero/negative justification
ITU-T S.5 Standardization of page-printing start-stop equipment and cooperation between page-printing and tape-printing start-stop equipment (ITA2)
ITU-T G.614 Characteristics of symmetric pair star-quad cables designed earlier for analogue transmission systems and being used now for digital system transmission at bit rates of 6 to 34 Mbit/s
ITU-T Q.109 Transmission of the answer signal in international exchanges
ITU-T J.15 Lining-up and monitoring an international sound-programme connection