1975-06-05
1977-12-20
Olms, Douglas W.
179 2A, H04B 346
Patent
active
RE0294993
ABSTRACT:
The instant invention relates to a device that permits a telephone line (loop) to be tested from a telephone central office, thereby eliminating the expense resulting from a visit by a repairman to a subscriber's premises. The disclosed device is responsive to an audio tone of a predetermined frequency, is located on a subscriber's premises and is activated by an audio tone of frequency within the pass band of the telephone circuit, this tone being transmitted from a central office. A tuned detector, located within the device, upon receiving said predetermined tone, actuates a timing circuit and relay circuit that places a circuit across the tip and ring of a telephone line. The circuit simulates the electrical condition of a telephone instrument in the "off hook" position and causes central office line equipment to operate, if the telephone loop is in an operable state, thereby indicating that the telephone loop is complete from the central office to the subscriber's premises.
REFERENCES:
patent: 1350737 (1920-08-01), Riess
patent: 1699415 (1929-01-01), Wetzel
patent: 2881253 (1959-04-01), Marheine
patent: 3067289 (1962-12-01), Zimmermann
patent: 3150237 (1964-09-01), Baldik et al.
patent: 3308239 (1967-03-01), Waldman et al.
patent: 3371165 (1968-02-01), Earle et al.
patent: 3417210 (1968-12-01), Chapin
patent: 3485952 (1969-12-01), Walker
patent: 3496300 (1970-02-01), Stokes
patent: 3530250 (1970-09-01), Schaum et al.
patent: 3553376 (1971-01-01), Bogaart
patent: 3636280 (1972-01-01), Wetzel
patent: 3641270 (1972-02-01), Ohshima et al.
patent: 3663769 (1972-05-01), Boatwright et al.
patent: 3692940 (1972-09-01), Konno et al.
Olms Douglas W.
Reliance Telecommunication Electronics Company
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