1976-12-13
1979-03-06
Olms, Douglas W.
179 2A, H04B 346
Patent
active
041432509
ABSTRACT:
The system disclosed transiently disconnects a subscriber's telephone equipment and network from the service provider (e.g. telephone company) network for a predetermined period of time in response to a remote switching pulse to facilitate the execution of diagnostic measurements without the necessity of visiting the subscriber's premises. The disconnect action is carried out by a two stage solid state circuit incorporating gate controlled devices such as SCRs together with RC networks whereby a capacitance is charged in response to the remotely originated switching pulse and then discharges to energize a switching relay and to maintain it energized for a predetermined period. In the energized state the switching relay isolates the subscriber network and its equipment from the telephone company network to permit the diagnostic measurements. The circuit design also provides improved noise suppression, as well as protection against spurious switching and certain overvoltage conditions. A modified version also provides means for detecting certain tip short conditions.
REFERENCES:
patent: 3739107 (1973-06-01), Spencer
patent: 3773986 (1973-11-01), Tremblay
patent: 3867588 (1975-02-01), Pickens et al.
patent: 3909538 (1975-09-01), Jacobson
patent: 3912882 (1975-10-01), Beerbaum
patent: 4016360 (1977-04-01), Cane
patent: 4041255 (1977-08-01), Cambridge et al.
patent: 4054759 (1977-10-01), McGrath et al.
Olms Douglas W.
TII Corporation
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