Telephone subscriber loop test system

Details Telephone subscriber loop test system Telephone subscriber loop test system

1988-07-22

1989-07-25

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

379 30, 379 29, H04M 124, H04B 346

Patent

active

048521450

ABSTRACT:
A method of locating faults in a telephone system including the steps of connecting antiparallel rectifying switches (ARS's ) that inhibit alternating current (A.C.) flow in one direction but not the other between subscriber equipment and respective telephone company lines, applying an A.C. test signal to a telephone company line and measuring a resulting signal, and determining whether a fault is on the telephone company line or customer equipment based upon the resulting signal. Also disclosed is an ARS that includes a first input and output, a second input and output, and paths between respective inputs and outputs providing low turn-on thresholds in one direction between respective inputs and outputs and high turn-on thresholds in the other direction, the directions of low and high being the same for both sets of inputs and outputs.

REFERENCES:
patent: 4113998 (1978-09-01), Ashdown et al.
patent: 4139745 (1979-02-01), Ashdown et al.
patent: 4373121 (1983-02-01), Sartori et al.
patent: 4396809 (1983-08-01), Brunssen
patent: 4438299 (1984-03-01), Tomin
patent: 4626632 (1986-02-01), Mazz

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