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ITU-T G.431 Hypothetical reference circuits for frequency-division multiplex radio-relay systems
ITU-T G.441 Permissible circuit noise on frequency-division multiplex radio-relay systems
ITU-T G.442 Radio-relay system design objectives for noise at the far end of a hypothetical reference circuit with reference to telegraphy transmission
ITU-T I.130 Method for the characterization of telecommunication services supported by an ISDN and network capabilities of an ISDN
ITU-T I.220 Common dynamic description of basic telecommunication services