Packet and circuit switched communications network

摘要: A telecommunications network (Fig. 1) being operable as a packet switch and circuit is comprised of plurality units including call controller unit. Each the connected in common to data (607), address (610), control leads (221, 224, 225, 613-618) bus, commonly available for signal transmissions both signals between unit other communications calling called ones units. bus 2) by way arbitrating access units, so that only one may transmit at any time. The includes, poll (300) polling asynchronous transmission requests, grant circuit. responsive granting an indefinite period time required from synchronous cycle (400), request generating inhibiting enabling via during predetermined