Device for sequentially altering a communication line for remote

Details Device for sequentially altering a communication line for remote Device for sequentially altering a communication line for remote

1992-11-20

1996-08-27

Chin, Stephen

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Including fault responsive disconnection of tested component

379 1, 379 27, 379 29, 379 30, H04M 124, H04M 308, H04M 322

Patent

active

055508944

ABSTRACT:
A network termination unit for connection to a telephone line at a predetermined demarcation point thereof for sequentially simulating a plurality of fault conditions to allow a diagnostic routine to be performed on the telephone line at a remote location from the demarcation point. The network termination unit includes a plurality of semi-conductor switches electrically connected to conductors of the telephone line to establish a network of electrical paths capable of altering the electrical condition of the telephone line when caused to assume a state of conduction. A logic module causes the switches to assume either a closed or an opened condition in accordance with a predetermined sequence established by a hard-wired program.

REFERENCES:
patent: 4396809 (1983-08-01), Brunssen
patent: 4529847 (1985-07-01), DeBalko
patent: 4653084 (1987-03-01), Ahuja
patent: 4707850 (1987-11-01), Horton
patent: 4796290 (1989-01-01), Perry
patent: 4807277 (1989-02-01), Perry
patent: 4845736 (1989-07-01), Posner
patent: 5073919 (1991-12-01), Hagensick
patent: 5195124 (1993-03-01), Ishioka
patent: 5222119 (1993-06-01), Asano

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