TIME DIVISION MULTIPLEXED COMPUTERIZED BRANCH EXCHANGE

摘要

Several shelf buses are connected to line circuits and a number of expanders which couple the buses with the main intershelf bus and are arranged serially along it. The interhelf bus comprises a unidirectional source which receives signals from the expanders signals to the expanders. The source bus provides signals to the destination bus through a turn-around circuit. The turnaround circuit provides a time delay which is a function of intershelf bus length and a clocking signal is distributed along the destination bus to provide sequential activation of the expanders both for transmission.