Remote line test facility

Details Remote line test facility Remote line test facility

1993-10-19

1994-09-06

Chin, Stephen

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

379 30, H04M 124, H04B 346

Patent

active

053454960

ABSTRACT:
Circuitry is provided for testing telephone lines, the circuitry comprising a loop current ring trip detector and a relay which in operation is used to break normal current to provide an end of call indication, and wherein said relay is also operative in one test mode to switch from said loop current ring detector to a comparator which functions as a test mode detector. The means may also include a second relay which when the circuit is in a second test mode is operated simultaneously with the first relay, the second relay being connected to a bell capacitor the discharge rate of which can be measured by said capacitor, and the comparator output is sequentially monitored to provide information as to the condition of the insulation and regarding bell capacitor and terminal connection.

REFERENCES:
patent: 4079210 (1978-03-01), Sanderson
patent: 4196321 (1980-04-01), Bosik
patent: 4320258 (1982-03-01), McDonald
patent: 4709386 (1987-11-01), Shimizu
patent: 5054050 (1991-10-01), Burke et al.

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