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ITU-T M.1040 Characteristics of ordinary quality international leased circuits
ITU-T M.1055 Lining up an international multiterminal leased circuit
ITU-T M.1320 Numbering of channels in data transmission systems
ITU-T M.1235 Use of automatically generated test calls for assessment of network performance
ITU-T M.1350 Setting up, lining up and characteristics of international data transmission systems operating in the range 2.4 kbit/s to 14.4 kbit/s
ITU-T M.1355 Maintenance of international data transmission systems operating in the range 2.4 to 14.4 kbit/s
ITU-T Q.500 Digital local, combined, transit and international exchanges - Introduction and field of application
ITU-T Q.522 Digital exchange connections, signalling and ancillary functions
ITU-T Q.500 Supplement 1 Definition of relative levels, transmission loss and attenuation/frequency distortion for digital exchanges with complex impedances at Z interfaces