Portable line test telephone

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Using portable test set

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Details

379 22, 379 27, 379 30, H04M 124, H04M 308, H04M 322

Patent

active

057780501

ABSTRACT:
The portable line test telephone of the present invention consists of the switching means to operate different kinds of tests, the high voltage generating means to measure telephone capacity and insulation resistance, the dialing means to call and the call circuit means to talk with a subscriber or the called. Accordingly, line operator can make direct tests and examine telephone capacity, earth, line disconnection, line cross, insulation resistance with calling and talking with a subscriber.

REFERENCES:
patent: 4843620 (1989-06-01), Hagedorn
patent: 4868858 (1989-09-01), Faith
patent: 5025466 (1991-06-01), Hilligoss et al.
patent: 5157708 (1992-10-01), Garthwaite et al.
patent: 5235629 (1993-08-01), Butler et al.

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