System and method for ring latency measurement and correction

Details System and method for ring latency measurement and correction System and method for ring latency measurement and correction

1995-06-01

1997-08-12

Olms, Douglas W.

Multiplex communications

Channel assignment techniques

Polling

370252, 370460, 370516, H04J 300

Patent

active

056573154

ABSTRACT:
A system and method for passively measuring and correcting ring latency on a token or FDDI ring includes generating bits and token frames in a defined pattern according to the token ring protocol. A passive device coupled to the token ring measures CMIN, the minimum spacing, CMAX, the maximum spacing in bits and calculates Fi the frequency of changes in Cmin and Cmax between successive tokens or a token and a frame on the ring. A latency event vector Li is generated by the passive device. A controller responsive to the latency vector Li corrects the spacing between successive tokens or a token and frame to achieve a constant ring latency regardless of electrical or operational changes on the token ring.

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IEEE Std 802.5-1985 "Token Ring Access Method and Physical Layer Specifications" New York, 1985.
IBM Technical Disclosure Bulletin, vol. 37, No. 2A, Feb. 1994, pp. 349-350, "Determination of Bandwidth & Latency in a Multimedia Communication Enviroment".
IBM Technical Disclosure Bulletin, vol. 32, No. 11, Apr. 1990, p. 262, "Method of Measuring the Latency of a Token-Ring With Microcode".

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