Architecture for increasing the number of digital channels which can be processed in a channel bank

摘要

A double density channel bank architecture compatible with an existing D4 backplane and D4 channel units transmits or receive PCM data on the PAM bus, while simultaneously transmitting or receiving PCM data on the PCM bus. A double density channel unit (CU) provides data for two transmit and two receive T-1 timeslots to increase the capacity of a D4 channel bank from 48 channels to 96 channels. Channel bank timing of PCM data on the PAM bus avoids contention between the PCM data and PAM data. The double density CU's are provided with means for converting analog signals to PCM format.