Multiplex communications – Wide area network – Packet switching
Patent
1991-07-29
1993-10-26
Chin, Wellington
Multiplex communications
Wide area network
Packet switching
H04L 1242
Patent
active
052572641
ABSTRACT:
A purging station selected for removal of no-owner frames in a token ring network, and a corresponding method for its operation. The purging station initiates a purge cycle only if the network is not "idle" and, optionally, only if the network is not "near fully loaded," these terms being defined in relation to a token cycle. Therefore, no unnecessary purge marker frames are transmitted onto the network when it is idle or near fully loaded. Once purging is initiated, the purging station transmits at least one purge marker frame onto the ring network, and strips data received from the ring until a purge termination flag is set, upon detection of a received purge marker frame, a received token, or detection of a ring re-initialization procedure.
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National Telecommunications Conference. Vol. 1, Dec. 1981, New Orleans, LO., US. W. Bux et al. "A Reliable Token-Ring System for Local Area Communication" pp. A2.2.1-A2.2.1.
Data Communications. Vol. 13, No. 9, Aug. 1984, New York, NY US, pp. 125-139; J. Bartik; "IBM's token ring: Have the pieces finally come together?", see p. 131, left-hand column, lines 3-13, see p. 135, left-hand column, line 17--p. 136, left-hand column, line 10.
Pending application for U.S. Patent Serial No. 07/884,321, of Yang et al, filed May 11, 1992, originally filed Aug. 12, 1988, "Frame Removal Mechanism for Token Ring Networks".
Ramakrishnan Kadangode K.
Yang Henry S.
Cefalo Albert P.
Chin Wellington
Digital Equipment Corporation
Johnston A. Signey
Young Barry N.
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