Method and means for remote testing of unused telephone lines

Details Method and means for remote testing of unused telephone lines Method and means for remote testing of unused telephone lines

1989-10-06

1990-07-31

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Using portable test set

379 22, 379 27, 379 5, 379 26, H04B 346

Patent

active

049455559

ABSTRACT:
A pair of unused telephone lines are connected together at a telephone office main frame by a device which is removably plugged in the main frame to connect a diode between said lines. At a point remote from the central office a testing circuit, which comprises a battery in series with a tone emitter, is releasably connected across the lines first with one polarity with respect to the lines, and then with the opposite polarity. If a tone is emitted for only one connection but not the other, the lines should be in working order.

REFERENCES:
patent: 4756017 (1988-07-01), Bush

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