Collision crossbar switch
US4929940A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1988 |
| Grant date | May 29, 1990 |
| Priority date | — |
| Expiry date | Nov 18, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q11/04
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.