Termination unit with maintenance facility

Details Termination unit with maintenance facility Termination unit with maintenance facility

1992-12-21

1995-02-21

Chin, Stephen

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Including fault responsive disconnection of tested component

379 5, 379 27, 379 29, 379 30, 370 13, 370 15, H04M 124, H04M 308, H04M 322, H04J 116

Patent

active

053923278

ABSTRACT:
There is a demand for user access to ISDN services at the two-wire interface point. The frequently raised objection to such access is the problem of determining the location of a fault and hence the responsibility for the fault. This is solved by the use of a voltage sensor responsive to a DC voltage less than a normal line feed voltage within a voltage range not used in normal operation to control a switch operative to disconnect a subscriber termination unit from the line, and to provide a known linear terminating impedance for the line for the duration of the application of the DC voltage.

REFERENCES:
patent: 3773986 (1973-11-01), Tremblay
patent: 4041255 (1977-08-01), Cambridge et al.
patent: 4438299 (1989-03-01), Tomim
patent: 4700380 (1987-10-01), Ahuja
patent: 4807277 (1989-02-01), Perry
patent: 4984250 (1991-01-01), Koyama
patent: 5195124 (1993-03-01), Ishioka

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