Preemptive bid communication system

Details Preemptive bid communication system Preemptive bid communication system

1983-06-15

1985-05-14

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

3408255, H04J 302

Patent

active

045176701

ABSTRACT:
In a bus communication system, a unidirectional transmit bus is coupled to a unidirectional receive bus such that information packets leaving the transmit bus are placed on the receive bus. A plurality of bus interface units (BIUs) are coupled in series at spaced locations to the transmit and receive buses. The BIUs communicate with one another by transmitting information packets on the transmit bus and receiving transmitted information packets from the receive bus. A BIU transmits an information packet when both buses are silent. In the event of a collision between two information packets, downstream BIUs abort transmission and defer to the most upstream BIU having transmitted. Each BIU having had a transmission aborted attempts to gain access to the bus by placing a beep on the transmit bus which informs other BIUs that a BIU requests access to the bus. Only the most upstream BIU requesting access is permitted to transmit a packet. This process is repeated until all BIUs having had a transmission aborted have transmitted their aborted information packets.

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Fouad A. Tobagi, "Multiaccess Protocols in Packet Communication Systems," IEEE Transactions on Communications, vol. Com-28, No. 4 Apr. 1980, pp. 468-488.

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