ITU-T G.746-1988 Characteristics of Second Order PCM Multiplex Equipment Operating at 6312 kbit/s - General Aspects of Digital Transmission Systems; Terminal Equipments (Study Groups XV and XVIII) 3 pp
The nominal bit rate is 6312 kbit/s. The tolerance on this rate is 2 30 parts per million (ppm).
ITU-T G.746-1988 history
1988ITU-T G.746-1988 Characteristics of Second Order PCM Multiplex Equipment Operating at 6312 kbit/s - General Aspects of Digital Transmission Systems; Terminal Equipments (Study Groups XV and XVIII) 3 pp