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ITU-T G.822 Controlled slip rate objectives on an international digital connection
ITU-T S Supplement 1 Minimal specifications for the bilingual (arabic/latin) teleprinter
ITU-T G.734 Characteristics of primary synchronous digital multiplex equipment operating at 1544 kbit/s
ITU-T N.21 Limits and procedures for the lining-up of a sound-programme circuit
ITU-T O.95 Phase and amplitude hit counters for telephone-type circuits
ITU-T R.80 Causes of disturbances to signals in VFT channels and their effect on telegraph distortion
ITU-T K.24 Method for measuring radio-frequency induced noise on telecommunications pairs
ITU-T Q.33 Protection against the effects of faulty transmission on groups of circuits
ITU-T I.254.1 Multiparty supplementary services : Conference calling (CONF)
ITU-T G.951 Digital line systems based on the 1544 kbit/s hierarchy on symmetric pair cables
ITU-T R.40 Coexistence in the same cable of telephony and super-telephony telegraphy
ITU-T U.4 Exchange of information regarding signals destined to be used over international circuits concerned with switched teleprinter networks