Apparatus for distinguishing between failures in a digital...

Details Apparatus for distinguishing between failures in a digital... Apparatus for distinguishing between failures in a digital...

H - Electricity

04

J

354/225, 340/98

H04J 3/14 (2006.01)

Patent

CA 1089997

Abstract of the Disclosure At a channel bank, such as a D-type channel bank used in the Bell Systems, a steady visual alarm is exhibited if the source of a detected failure is at a location either within the channel bank or in the digital hierarchy of a digital transmission network. Unfortunately, a craftsperson is unable to distinguish between the two failure locations. To distinguish between the locations, apparatus for indicating the failure location to be in the hierarchy is situated be- tween the hierarchy and the channel bank and, responsive to an alarm failure signal from the hierarchy, extends a predeter- mined cyclic code signal to the channel bank. Without modification of the channel bank and responsive to the code signal, a cyclic visual alarm in lieu of the prior art steady alarm is provided thereat.

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