COMMUNICATION NETWORK SYSTEM

PURPOSE:To attain efficiently data transfer, by designating a path when a buffer memory receiving input data is designated, and circulating the input data to all buffer memories when not designated. CONSTITUTION:Input buffer memories 1, 2 and output buffer memories 3, 4 are provided, and data selectors 5, 6 select any of internal packet transfer paths 15, 16 respectively and connect it to the memories 3, 4. Further, control circuits 7-9 are provided, they are controlled with a circuit 8, the information designating the path is stored in an FF10, its output Q is inputted to the circuit 8, which designates either the memory 3 or 4 with the output. Moreover, input packets INA, INB are fed to the memories 1, 2 from transfer paths 11, 12 respectively and output packets OUTA, OUTB are transmitted to transfer paths 13, 14 from the memories 3, 4. Further, the designational information or the non-designational information of the packets written in the packets INA, INB is branched at transfer paths 19, 20 from the transfer paths 15, 16 and inputted to the circuit 8.