Method of providing effective priority access in a dual bus syst

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

1989-12-14

1990-12-11

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

3408255, H04J 312

Patent

active

049775570

ABSTRACT:
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.

REFERENCES:
patent: 4922244 (1990-05-01), Hullett et al.
patent: 4926418 (1990-05-01), Cidon et al.
patent: 4942569 (1990-07-01), Maeno
Proposed Standard: DODB Metropolitan Area Network, IEEE 802.6-89/45 Draft, Aug. 7, 1989, pp. 2, 2.1-2.1.2.2.
"Improving DQDB Fairness", by E. L. Hahne et al., American Telephone and Telegraph, Contribution to the IEEE 802.6 Working Group, Document No.: 802.6/89/, dated Sep. 8, 1989.
"A Problem in the Multi-Priority Implementation of the Bandwidth Balancing Mechanism" by Michael Spratt, Hewlett-Packard Information Systems Centre, Contribution to the IEEE 802.6 Working Group, IEEE pp. 802.6-89/61, dated Nov. 3, 1989.

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