Method of providing effective priority access in a dual bus...

Details Method of providing effective priority access in a dual bus... Method of providing effective priority access in a dual bus...

H - Electricity

04

B

363/10, 325/27

H04B 7/24 (2006.01) H04L 12/28 (2006.01)

Patent

CA 2025191

A METHOD OF PROVIDING EFFECTIVE PRIORITY ACCESS IN A DUAL BUS SYSTEM Abstract of the Disclosure A method provides effective priority access in a system having dual unidirectional and oppositely oriented buses. The method is intended to enhance the proposed standard, DQDB Metropolitan Area Network. An effectiveness factor K is introduced to enhance the effectiveness of the priority. In one embodiment lower priority CD counters are incremented by K for each higher priority request. A second embodiment also increments lower priority RQ counters. A third embodiment increments the lower priority CD slots only for the highest request received in a given slot. A fourth embodiment also increments lower priority RQ counters. A variation provides a threshold counter for controlling the use of the effectiveness factor.

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