Path switching method, path switching apparatus and nodes of UPS

Details Path switching method, path switching apparatus and nodes of UPS Path switching method, path switching apparatus and nodes of UPS

1997-09-15

2000-03-14

Wright, Norman Michael

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

714 3, 705410, 705408, 370244, 370250, G06F 1300, G06F 1100, H04J 314

Patent

active

060386789

ABSTRACT:
An alarm detect unit (a path switching apparatus) for selecting an active path comprises a path-alarm detect circuit and a guard timer for a working path as well as a path-alarm detect circuit and a guard timer for a protection path. When an alarm is detected on the active path, alarm information, that is, information on the generation of the alarm, is delayed by a predetermined time by the guard timer of the working or protection path that serves as the active path.
By the same token, when an alarm is detected on a standby path, alarm information, that is, information on the recovery of the alarm, is delayed by a predetermined time by the guard timer of the working or protection path that serves as the standby path. Either the working or protection path is then selected as the active path in accordance with pieces of alarm information output by the two guard timers which indicate the line-failure-occurrence states of the active and standby paths.

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