Method of providing effective priority access in a dual bus system

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United States of America Patent

PATENT NO 4977557
SERIAL NO

07450792

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Abstract

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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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Patent Owner(s)

Patent OwnerAddress
NORTEL NETWORKS LIMITEDWORLD TRADE CENTER OF MONTREAL 380 ST ANTOINE STREET WEST 8TH FLOOR MONTREAL QUEBEC H2Y 3

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kositpaiboon, Rungroj Nepean, CA 2 79
Phung, Van P T Ottawa, CA 5 175

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