Data communication device including circuitry responsive to an o

Details Data communication device including circuitry responsive to an o Data communication device including circuitry responsive to an o

1983-04-13

1985-02-19

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 94, 3408255, H04Q 900

Patent

active

045009902

ABSTRACT:
A data communication device for use either as an interface between a data processing device and a transmission medium of a CSMA/CD network or as a repeater between a CSMA/CD network and an additional data communication network which shares a transmission medium with the CSMA/CD network, sends an obstruction signal towards the CSMA/CD network when an input buffer tends to overflow on storing an input data packet for delivery to the data processing device or for transmission towards the additional data communication network. The obstruction signal is for causing a collision in the CSMA/CD network. The additional data communication network may be plural in number. When the additional data communication networks are CSMA/CD networks, the transmission of data packets thereto is suspended when a collision is detected at the repeater. The transmission is restarted a variable interval after disappearance of the collision. The variable interval corresponds to a weighted random number known in the art.

REFERENCES:
patent: 4063220 (1977-12-01), Metcalfe et al.
patent: 4099024 (1978-07-01), Boggs et al.
patent: 4234952 (1980-11-01), Gable
patent: 4292623 (1981-09-01), Eswaran et al.
patent: 4380761 (1983-04-01), Boggs
patent: 4412326 (1983-10-01), Limb
"Ethernet: Distributed Packet Switching for Local Computer Networks", by R. M. Metcalfe et al., Communications of the ACM, vol. 19, #7, Jul. 1976.

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