ASYNCHRONOUS TRANSFER MODE EXCHANGE SYSTEM

PROBLEM TO BE SOLVED: To avoid the timing design by providing an input interface, a reception synchronization converter, a transmission synchronization converter, an output interface and a special space division switch array so as to improve the throughput. SOLUTION: A clock synchronization cell string C is received an input interface circuit 40 from an external transmission line by an exchange main body 1. The clock synchronization cell string C is converted into a clock asynchronization cell string C* by reception synchronization conversion circuits 10-1-10-n and fed to a switch array 2, in which prescribed exchange is conducted. The reception synchronization conversion circuits 10-1-10-n are arranged between 1st stage unit switch circuits 20-11-20-n1 and interface circuits 40-1-40-n. The exchanged clock asynchronization cell string C* is converted again into the clock synchronization cell string C by transmission synchronization conversion circuits 11-1-11-n and outputted via the output interface circuit 11.