MULTIPLE BEARER EXCHANGE

PURPOSE:To contrive the simplification of a constitution, by providing a high speed demultiplex section demultiplexing high speed multiplex information after exchange from a high speed exchange section and demultiplexing the information into a high speed call and low speed multiplex information and a low speed demultiplex section demultiplexing the low speed multiple information from high speed demultiplex section connected into plural low speed calls. CONSTITUTION:Low speed calls L(1)-L(m) are given to subframe memories 1(1)-1(m), stored tentatively and the timing is adjusted and fed further to a low speed multiplexer 2. In this case, the location of the subframe SF assigning the low speed calls L(1)-L(m) is changed to exchange the low speed calls L(1)-L(m) in the unit of subframes SF. High speed multiplex information HM exchanged by the high speed switch 5 is demultiplexed by the high speed demultiplexer 6 and demultiplexed into the high speed calls H(1)-H(k) and the low speed multiplex information LM an the low speed multiplex information LM is demultiplexed into the low speed calls L(1)-L(m) by the low speed demultiplexer 7 and they are sent to a low speed call terminal equipment via subframe memories 8(1)-8(m).