H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/10
H04J 3/02 (2006.01) H04J 3/14 (2006.01)
Patent
CA 1069627
COMMON CONTROL FAILURE ALARM APPARATUS - Abstract of the Disclosure A local alarm circuit and a remote alarm circuit carry out a plurality of failure monitoring and alarming functions for each of a plurality of digital groups (digroups), of time division multiplexed channels that are time multiplexed together on to a common bus. The local and remote alarm circuits utilize common control techniques and are of a similar circuit configuration. Each alarm circuit comprises an alarm timing store having a shared recirculating memory, and an alarm status store with a shared recirculating memory. The timing store serves to integrate and time failure indications for each of the digroups, and the status store maintains a continuing real time record of the alarm status for each digroup. When the timing store counts out a predetermined failure duration for a given digroup, the alarm status record for the digroup is changed and an alarm signal is generated. Once an alarm is registered for a digroup, the timing store then serves to integrate and time failure-free indications for the digroup. That is, it counts out a predetermined failure- free duration (after appropriate maintenance action has been taken) before it terminates the alarm state record in the status store and the alarm signal.
262659
Colton John R.
Heick Robert B.
Mann Henry
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