The 48-channel primary multiplexer provides conversion between 48 voice-frequency channels and one 1544 kbit/s ADPCM stream. In the 1544 kbit/s stream, the voice-frequency signals are coded according to the PCM encoding law defined in Recommendation G.711 and the ADPCM encoding law defined in Recommendation G.721.
ITU-T G.724-1993 Referenced Document
ITU-T G.703 Physical/electrical characteristics of hierarchical digital interfaces*， 2016-03-31 Update
ITU-T G.706 Frame Alignment and Cyclic Redundancy Check (CRC) Procedures Relating to Basic Frame Structures Defined in Recommendation G.704 (Study Group XVIII) 19 pp
ITU-T G.711 PULSE CODE MODULATION (PCM) OF VOICE FREQUENCIES
ITU-T G.712 Transmission performance characteristics of pulse code modulation channels = SERIES G: TRANSMISSION SYSTEMS AND MEDIA DIGITAL SYSTEMS AND NETWORKS - Digital terminal equipments - Coding of analogue signals by pulse code modulation*， 2024-04-19 Update
ITU-T G.713 Performance Characteristics of PCM Channels between 2-Wire Interfaces at Voice Frequencies - General Aspects of Digital Transmission Systems; Terminal Equipments (Study Group XV and XVIII; 12 pp; Replaced by Recmn G.712)
ITU-T G.721 32 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM) - General Aspects of Digital Transmission Systems; Terminal Equipments (Study Groups XV and XVIII) 38 pp
ITU-T G.724 CHARACTERISTICS OF A 48-CHANNEL LOW BIT RATE ENCODING PRIMARY MULTIPLEX OPERATING AT 1544 kbit/s
ITU-T G.733 CHARACTERISTICS OF PRIMARY PCM MULTIPLEX EQUIPMENT OPERATING AT 1544 kbit/s
ITU-T G.724-1993 history
1993ITU-T G.724-1993 CHARACTERISTICS OF A 48-CHANNEL LOW BIT RATE ENCODING PRIMARY MULTIPLEX OPERATING AT 1544 kbit/s