ITU-T G.742-1988 Second Order Digital Multiplex Equipment Operating at 8448 kbit/s and Using Positive Justification - General Aspects of Digital Transmission Systems; Terminal Equipments (Study Groups XV and XVIII) 5 pp
that different primary and second order multiplex equipments exist, depending upon the characteristics
of different networks and the various types of signals to be transmitted in those networks;
(b) that, although studies will continue with the aim of r
ITU-T G.742-1988 history
1988ITU-T G.742-1988 Second Order Digital Multiplex Equipment Operating at 8448 kbit/s and Using Positive Justification - General Aspects of Digital Transmission Systems; Terminal Equipments (Study Groups XV and XVIII) 5 pp