Multiplex communications – Wide area network – Packet switching
Patent
1989-10-16
1992-08-25
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 851, H04J 302
Patent
active
051425300
ABSTRACT:
A multi-frame stripping method for use in a token ring network utilizing early token release with multiple frames transmitted by multiple stations circulating around the ring. The method recovers the ring with minimum loss of data after detection of an error condition resulting in frame corruption. The transmitting station is responsible for removing its own frames from the ring. With one or more of its frames corrupted, a station terminates frame removal after the transmitter has finished transmitting when a frame is received from another station without code violation errors in the frame header if the frame counter has returned to its initial value. The station terminates stripping when only a single frame is transmitted and then becomes corrupted if an isolated ending delimiter is detected at the station. The station also terminates stripping in the multi-frame case when the ending delimiter of the last frame transmitted by the source station is received without code violation error in the I-bit, if each preceding ending delimiter is correctly detected regardless of data corruption occurring in any frame header. The method is applicable to the IEEE 802.5 and ANSI X3T9.5 (FDDI) standards.
REFERENCES:
patent: 4811361 (1989-03-01), Bacou et al.
patent: 4922244 (1990-05-01), Hullett et al.
patent: 4932023 (1990-06-01), Geyer et al.
patent: 4932032 (1990-06-01), Geyer et al.
patent: 4964113 (1990-10-01), Geyer et al.
Geyer Joel E.
Lee Joseph K.
Norman Vernon R.
Wilson Kenneth T.
Hom Shick
International Business Machines - Corporation
Olms Douglas W.
Timar John J.
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