Multiplex communications – Wide area network – Packet switching
Patent
1988-12-28
1989-12-12
Griffin, Robert L.
Multiplex communications
Wide area network
Packet switching
370 15, H04J 314
Patent
active
048872563
ABSTRACT:
In a communication system having first and second ring transmission lines for connecting a plurality of stations and for providing opposite signal transmission direction, a first station, which is located just downstream side of a failure point occurred in the first transmission line, sends out a beacon signal along said first transmission line while causing an intentional failure in the second transmission line on its downstream side and a second station, which is located just upstream side of the failure point on the first transmission line, forms a first loop-back path (WRAPA) by detecting the intentional failure on the second transmission line if the second station has received the beacon signal. The first station forms a second loop-back path (WRAPB) by receiving the beacon from the second transmission line which is sent back by the second station.
REFERENCES:
patent: 3652798 (1972-03-01), McNeilly et al.
patent: 4190821 (1980-02-01), Woodward
patent: 4553233 (1985-11-01), Debuysscher et al.
patent: 4763315 (1988-08-01), Nakayashiki et al.
patent: 4815069 (1989-03-01), Nakayashiki et al.
Harakawa Takeshi
Kashio Jiro
Nakayashiki Susumu
Chin Wellington
Griffin Robert L.
Hitachi , Ltd.
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