Telephone system communication mechanism employing central offic

Details Telephone system communication mechanism employing central offic Telephone system communication mechanism employing central offic

1991-04-03

1992-04-07

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

379 23, H04M 330, H04B 346

Patent

active

051034735

ABSTRACT:
A data communication and sleeve lead control apparatus provides auxilary signalling between a no-test trunk control unit, and another unit such as a pair gain unit which is coupled with the link between the control unit and the no-test trunk, while maintaining stability of the sleeve lead monitored by the no-test trunk. The appearance is installed within the pair gain unit, and effectively isolates the sleeve lead to the no-test trunk from sleeve lead to the no-test trunk control unit, so that the data communications between the control unit and the pair gain unit are transparent to the no-test trunk. During a prescribed sleeve lead current flow state, e.g. high resistance or low current flow, controlled interruption of sleeve lead current between the control unit and the pair gain unit effectively modulates the state of the sleeve lead therebetween, but does not change the intended current flow state applied by way of the sleeve lead output port to the no-test trunk.

REFERENCES:
patent: 3773986 (1973-11-01), Tremblay
patent: 4924489 (1990-05-01), Lawrence et al.

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