Multiplex communications – Wide area network – Packet switching
Patent
1991-01-22
1994-03-01
Chin, Wellington
Multiplex communications
Wide area network
Packet switching
34082505, H04L 1242
Patent
active
052914917
ABSTRACT:
RingOp/Claim oscillations due to duplicate addresses and transmit aborts are avoided by using token preserver frames to reset the TVX timer in a station. A communications network having a plurality of stations capable of transmitting frames onto the network, and the stations capable of detecting transmission on the network, and the stations capable of taking predetermined action in the absence of detecting the transmission for a predetermined first time interval, and a first timer for measuring the predetermined first time interval. Measuring a second predetermined time interval, the second predetermined time interval being chosen to be less than the first predetermined time interval; transmitting a reset frame onto the network by a selected station at time intervals substantially equal to the second predetermined time interval, and the reset frames being capable of causing a station to reset the first timer to a beginning value. The network may be a token controlled ring. The reset frame may be a token preserver frame.
REFERENCES:
patent: 4494233 (1985-01-01), Bahr et al.
patent: 4813039 (1989-03-01), Yoshihiro
patent: 5065397 (1991-11-01), Shiobara
Hutchison Jerry D.
Yang Henry S.
Cefalo Albert P.
Chin Wellington
Digital Equipment Corporation
Johnston A. Sidney
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