ITU-T G.732-1988 Characteristics of Primary PCM Multiplex Equipment Operating at 2048 kbit/s - General Aspects of Digital Transmission Systems; Terminal Equipments (Study Groups XV and XVIII) 7 pp
1.1 Fundamental characteristics
The encoding law used is the A-law as specified in Recommendation G,711. The sampling rate, load capacity and the code are also specified in that Recommendation.
The number of quantized values is 256.
Note -The inversion of bits 2, 4, 6, and 8 is covered by the encoding law and is applicable only to voice-channel time slots.
1.2 Bit rate
The nominal bit rate is 2048 kbit/s. The tolerance on this rate is f 50 parts per million (ppm).
1.3 Timing signal
It should be possible to derive the transmitting timing signal of a PCM multiplex equipment from an
Note - Further study is required on the effect of jitter of the incoming signal on the timing signal, and internal source, from the incoming digital signal and also from an external source.
on the measures to be taken in case of loss of the incoming signal or the external source.
ITU-T G.732-1988 history
1988ITU-T G.732-1988 Characteristics of Primary PCM Multiplex Equipment Operating at 2048 kbit/s - General Aspects of Digital Transmission Systems; Terminal Equipments (Study Groups XV and XVIII) 7 pp