Subscriber terminal circuit for connecting an analog subscriber

Details Subscriber terminal circuit for connecting an analog subscriber Subscriber terminal circuit for connecting an analog subscriber

1997-09-18

2000-04-18

Loomis, Paul

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Including fault responsive disconnection of tested component

379 1, 379399, H04M 124, H04M 308, H04M 322

Patent

active

060524375

ABSTRACT:
An interface circuit with integrated test functions relating to the subscriber line, with a test circuit realized in the simplest case by an ohmic resistance, and comprising a relay circuit having two changeover contacts by means of which in one switching position the leads of the subscriber line are connected with the interface circuit, and in the other switching position the subscriber line is disconnected and the test circuit is connected to the interface circuit.

REFERENCES:
patent: 4807277 (1989-02-01), Perry
patent: 5323460 (1994-06-01), Warner et al.
patent: 5392327 (1995-02-01), Galpin
patent: 5404389 (1995-04-01), Fukuda et al.
patent: 5483573 (1996-01-01), Steenton et al.
patent: 5537287 (1996-07-01), Dreir
patent: 5677941 (1997-10-01), Rice

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