Loop mode transmission system with bus mode backup

Details Loop mode transmission system with bus mode backup Loop mode transmission system with bus mode backup

1992-01-10

1994-03-22

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 16, H04J 116

Patent

active

052971341

ABSTRACT:
A transmission system formed by a master station and a plurality of satellite stations which are connected by a transmission line into a loop, the data and command signals from the master station being passed sequentially from station to station around the loop. A failure in a satellite station that prevents further loop transmission is detected by watchdog timers in one or more successive stations. As a result, the stations detecting the failure switch themselves into a bus-mode of operation, the master station switches itself and the remaining stations into the bus-mode of operation. The switching back to the loop-mode of operation can be performed under control of the master station automatically, upon detection that the failure has been corrected. The switching also can be performed under external command.

REFERENCES:
patent: 4914625 (1990-04-01), Billian
patent: 4964095 (1990-10-01), Tyrrell et al.
patent: 5079759 (1992-01-01), Kajiyama
Patent Abstracts of Japan, Abstract of Published Application No. 57-92946 to Sadao Mizokawa, Jun. 9, 1982.
Patent Abstracts of Japan, Abstract of Published Application No. 57-80847 to Yoshihisa Okamoto, May 20, 1982.
Patent Abstracts of Japan, Abstract of Published Application No. 57-129048 to Sadao Mizokawa, Aug. 10, 1982.
Patent Abstracts of Japan, Abstract of Published Application No. 55-150636 to Yoshio Sashita, Nov. 22, 1980.
Mizokawa `Patent Abstract of Application No. 57-92946` Jun. 9, 1982.

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