Automatic loop segment failure isolation

Details Automatic loop segment failure isolation Automatic loop segment failure isolation

1998-05-01

2000-08-08

Rao, Seema S.

Multiplex communications

Fault recovery

Bypass an inoperative station

370225, 370245, 370463, 370522, 714 4, 34082505, G01R 3108, H04J 314

Patent

active

061011665

ABSTRACT:
A hub port in a hub of a loop network which automatically bypasses a node port which is generating a particular loop failure initialization sequence. The hub port contains a detection circuit which enables the hub port to detect loop failure initialization data received from its attached node port. Upon detecting such data from an attached node port, the hub port replaces such data with buffer data to be passed to the next hub port. Upon detecting the completion of a loop failure initialization sequence from an attached node port, the hub port enters a bypass mode. The hub port no longer passes on output from its attached node port and instead forwards along the internal hub link data received from the previous hub port in the hub loop. The bypass is maintained until the hub port receives a primitive sequence indicating the recovery of the attached node port. The hub port periodically sends at least one recovery sequence to the node port. When the hub port receives the same recovery sequence back from the node port, the hub port ends the bypass and reinserts the node port back into the hub loop.

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