Method of detecting a cable fault and switching to a redundant c

Details Method of detecting a cable fault and switching to a redundant c Method of detecting a cable fault and switching to a redundant c

1989-09-08

1990-10-16

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 14, 370 859, H04J 116

Patent

active

049641204

ABSTRACT:
A method by which the each module of a token passing local area network complying with IEEE standard 802.4 determines if the communication cable from which it is receiving signals is faulty and switches to a second, or redundant cable. Each module transmits the same signals over both cables, but can receive signals from only one, its selected cable. In normal operations, all modules receive signals from the same cable. Each of the modules has the capability of detecting faults in its selected cable, and of switching cables so that its second cable becomes its selected cable. Each module also has the capability of initiating the process or re-establising the network whenever a module switches cables in response to detecting a fault. Each module in response to the process of initiating re-establishing the network, switching cables so that all modules are listening to, or receiving signals from the same cable. Each module periodically checks to determine if low level noise is present on its selected cable, and if it is, the module switches cables. A module in the listen only mode of operation will periodically check to determine if the signals it is receiving or valid. If not, it will switch cables. A module whose redundant cable has been identified as being silent, will periodically check to determine if its redundant cable remains silent.

REFERENCES:
patent: 4519070 (1985-05-01), Bell
patent: 4627045 (1986-12-01), Olson
patent: 4658396 (1987-04-01), Barden
patent: 4701910 (1987-10-01), Ulug

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