Subscriber telephone test set

Details Subscriber telephone test set Subscriber telephone test set

1981-11-30

1983-11-15

Schreyer, Stafford D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

1791753F, 307115, H04B 1700, H04M 124

Patent

active

044157789

ABSTRACT:
Telephone testing equipment, particularly a telephone subscriber test set of the type enabling the subscriber to isolate malfunction either in the household interior telephone equipment, including interior household lines and telephone receivers, or in the telephone company central office lines. A test circuit is connected to the household interior lines, so as be interposed between the telephone company central office lines and the household receiver. This test circuit includes a normally "open" test switch, a transformer and a dial tone speaker. As the test switch is "closed", the dial tone, emanating from the telephone company central office lines is amplified through the test circuit speaker. The device includes an especial extension test unit for use in households, having more than one telephone receiver.

REFERENCES:
patent: 383017 (1888-05-01), Scribner
patent: 1514555 (1924-11-01), Meehan
patent: 1754628 (1930-04-01), Janson
patent: 3261926 (1966-07-01), Bryant et al.
patent: 3773986 (1973-11-01), Tremblay
patent: 3872383 (1975-03-01), Kolodziej
patent: 3944758 (1976-03-01), Carney et al.

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