Line current test device

Details Line current test device Line current test device

1989-08-28

1990-03-27

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

With blocking of normal usage

379 21, 379 27, 379 32, H04M 124, H04B 346

Patent

active

049127551

ABSTRACT:
A compact, unitary test device for use with telephone line conductors connected to customer premises telephone equipment comprises a first test circuit for terminating the conductors of the telephone line and for measuring current therein. The device also comprises a second test circuit for measuring current in the line conductors in series with the customer premises equipment during operation. A third test circuit provides a tone signal of a predetermined frequency to the line conductors. The test device has a switch set, a current measurement section, a resistance section, a tone generator and a power source. Further provided is a method of testing a telephone loop by measuring loop current level from a terminated position and in series with operative customer premises equipment. A tone signal is generated at a first predetermined point on the line conductors for reception at a second predetermined point.

REFERENCES:
patent: 3870836 (1975-03-01), Kusama
patent: 3912882 (1975-10-01), Beerbaum
patent: 4022987 (1977-05-01), O'Dea
patent: 4513179 (1985-04-01), Phillips et al.
patent: 4536703 (1985-08-01), Jablway
patent: 4825458 (1989-04-01), Dash

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