Common control failure alarm apparatus

Details Common control failure alarm apparatus Common control failure alarm apparatus

1975-11-18

1976-12-07

Stewart, David L.

179 15BY, H04J 314

Patent

active

039964230

ABSTRACT:
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.

REFERENCES:
patent: 3686441 (1972-08-01), Thomas
patent: 3867579 (1975-02-01), Colton
patent: 3903371 (1975-09-01), Colton
Bell Laboratories Record, Aug. 1971, "Monitoring the Performance of Digital Multiplex Circuits," by Geigel, pp. 199-200.
Bell System Technical Journal, Oct. 1972, "D2 Channel Bank . . . " pp. 1659-1673.
Bell Laboratories Record, Sept. 1973, "No. 4 ESS . . . " pp. 226-232.
Bell Laboratories Record, Aug. 1972, "The D3 Channel Bank," pp. 229-233.

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