Communication network signalling system link monitor and test un

Details Communication network signalling system link monitor and test un Communication network signalling system link monitor and test un

1995-02-07

1995-10-10

Chin, Stephen

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Including fault responsive disconnection of tested component

379 12, 379 32, 379 34, 370 13, 370 17, H04M 129, H04M 308, H04M 322, H04J 116

Patent

active

054577292

ABSTRACT:
A communication network signalling system couples a signal transfer point to a plurality of channel banks through links which include link monitor and test units. The link monitor and test units, which monitor the links in a passive, non-obtrusive manner and which at the same time are capable of being serially coupled into the link so as to insert signals in series with the link and to otherwise accomplish in-depth link testing and analysis, each include a pair of channel units coupled to opposite portions of an associated link and which are coupled together through a metallic through connection in the form of a normally unenergized relay. The metallic through connection provided by the relay maintains the signal path through the link during a variety of fault conditions, while at the same time permitting electronic portions of the channel units to be cross-connected to accomplish monitoring and testing functions. Each channel unit includes a dataport or other interface capable of coupling to the interface of the other channel unit as well as to monitor and test equipment, and which is coupled to the link through a high impedance to provide isolation of the link therefrom.

REFERENCES:
patent: 4870638 (1989-09-01), Kawano et al.
patent: 5195124 (1993-03-01), Ishioka

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