Bimodal bus accessing system

Details Bimodal bus accessing system Bimodal bus accessing system

1982-02-24

1984-03-27

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 94, 3408255, H04J 600

Patent

active

044398565

ABSTRACT:
A bus communication system has each of a plurality of bus interface units (BIUs) connected to a transmission bus at respective spaced locations along the bus. Each BIU includes a transmission system operable in both a contention mode and a token-passing mode. In the contention mode, the transmission system completes the transmission of information packets only after the BIU senses the bus and determines that no additional information packets are being transmitted on the bus. During the token-passing mode, the transmission system transmits an information packet only after the expiration of a time interval unique to that BIU and determined by the relative location both of that BIU and of the last BIU to transmit either an information or a start-up packet on the bus. A control system causes the transmission means to switch between the contention and token-passing modes of operation as a function of the transmission activity on the bus.

REFERENCES:
patent: 3851104 (1974-11-01), Willard et al.
patent: 4063220 (1977-12-01), Metcalfe et al.
patent: 4210780 (1980-07-01), Hopkins et al.
patent: 4293948 (1981-10-01), Soderblom
patent: 4387425 (1983-06-01), El-Gohary
Fouad A. Tobagi, "Multiaccess Protocols in Packet Communication Systems," IEEE Transactions on Communications, vol. Com-28, No. 4, Apr. 1980, pp. 468-485.

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