Packet switched communication system comprising collision avoida

Details Packet switched communication system comprising collision avoida Packet switched communication system comprising collision avoida

1982-12-02

1985-04-30

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 85, H04J 600, H04Q 1104

Patent

active

045148430

ABSTRACT:
The efficiency of packet switching networks is improved by using a collision avoidance technique rather than collision detection. The subscriber links are connected to a common node. A collision avoidance circuit in each link monitors the node to determine whether it is in a busy or idle status. The first message to arrive places the node in a busy status at which time all other, nontransmitting links are disconnected, thereby avoiding a collision. Later arriving messages are stored in buffers at each subscriber location and are transmitted when the node is again idle. In this manner messages are transmitted on a first-come basis, and can be of arbitrary duration regardless of bit rate.

REFERENCES:
patent: 2662974 (1953-12-01), Dorff
patent: 4063220 (1977-12-01), Metcalfe et al.
patent: 4199661 (1980-04-01), White et al.
patent: 4262357 (1981-04-01), Shima
patent: 4366480 (1982-12-01), Van Hatten
patent: 4417334 (1983-11-01), Gunderson et al.
patent: 4439856 (1984-03-01), Ulug

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