Listening device for tracing line continuity and detecting telep

Details Listening device for tracing line continuity and detecting telep Listening device for tracing line continuity and detecting telep

1997-07-24

1999-03-23

Loomis, Paul

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Using portable test set

379 27, H04M 124

Patent

active

058870512

ABSTRACT:
A pocket-size hand-held testing tool is provided for testing the operation of telephone lines and tracing the location of electric wires, including a sound signal channel with an output speaker, a dial tone detection circuit for detecting a dial tone on a telephone line, a probe for capacitively receiving a signal from a particular wire in a bundled wire cable to identify that wire as one to which a tracing signal is being applied at the other end of the cable, and a momentary switch normally connecting the dial tone detection circuit into communication with the sound signal channel but manually depressable to instead selectively switch the probe into communication with the sound signal channel while disconnecting the dial tone detection circuit from it.

REFERENCES:
patent: 4922516 (1990-05-01), Butler et al.
patent: 5025466 (1991-06-01), Hilligoss et al.
patent: 5193108 (1993-03-01), Stocklin
patent: 5703928 (1997-12-01), Galloway et al.

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