Continuity test set with voice communication

Details Continuity test set with voice communication Continuity test set with voice communication

1989-09-18

1990-06-12

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Using portable test set

379 25, 379 26, 324542, H04B 346

Patent

active

049339621

ABSTRACT:
First and second telephone handsets or headsets are used to form a continuity test set providing voice communication. The telephone handsets are modified to connect the transmitter and receiver elements in series with test leads and current-limiting resistors. Connectors are provided at the ends of the test leads, and one of said handsets is provided with a battery to establish a loop current. LEDs are disposed in selected test leads to provide a visual indication of the flow of loop current, which is established when the connectors are attached to common conductors at the remote ends of a multi-conductor cable or conduit.

REFERENCES:
patent: 1560278 (1925-11-01), Mahan
patent: 2799739 (1957-07-01), Lowman et al.
patent: 3792205 (1974-02-01), O'Dea
patent: 4388501 (1983-06-01), Ahuja
patent: 4588862 (1986-05-01), Grabowy
patent: 4777645 (1988-10-01), Faith et al.
"Improved Pair Identification Cuts Cable Handling Costs", D. R. Connally and A. L. Pence, Telephony, Aug. 9, 1971, pp. 68-72.

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