Trunking aspects of multistage time-division switching network with time-slot-interchange capability

To realise efficient use of interoffice time-division junctors of a p.c.m. integrated communication system, 4-stage and 5-stage interoffice switching networks are proposed. The blocking probabilities of the network are calculated, and it is shown that the efficiency of interoffice junctors reaches 70% and 85% in the 4- and 5-stage networks, respectively.