Collision crossbar switch

Details Collision crossbar switch Collision crossbar switch

1988-11-18

1990-05-29

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

340825790, 340825800, 340825500, H04Q 100

Patent

active

049299409

ABSTRACT:
A high speed collision N.times.M tri-state crossbar switch having M collision busses uses contention detection at the destination. In the event of a collision of messages, remedial action can be taken such as rerouting colliding messages over an alternate path provided by a second interconnection network with contention resolution capability. Collision detection codes are transmitted prior to the transmission of messages to each input port. The tri-state output buses are monitored for the collison detection codes to detect an error. In order to prevent damage to driver transistors connected to the tri-state buses when a contention occurs, current limiting is provided to limit the current through the driver transistors to a predetermined level.

REFERENCES:
patent: 4605928 (1986-08-01), Georgiou
patent: 4752777 (1988-06-01), Franaszek
patent: 4785396 (1988-11-01), Murphy et al.
patent: 4821258 (1989-04-01), Fraser

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