Signalling system for overvoltage protectors

Details Signalling system for overvoltage protectors Signalling system for overvoltage protectors

1977-12-05

1979-08-14

Claffy, Kathleen H.

H04B 346

Patent

active

041646320

ABSTRACT:
A system for signalling the fact that the fuses and limiting diodes in the connecting circuits of telephone lines are defective. Use is made of the rest supply resistors already present in the connecting circuits and the loop detector which is normally used for detecting calls. The fuses and limiting diodes are connected in such a way that a defect causes the loop detector, which is constructed as a differential voltage detector, to signal a call.

REFERENCES:
patent: 3573780 (1971-04-01), Butterbaugh
patent: 3812303 (1974-05-01), Stewart
patent: 3821495 (1974-06-01), Duff
patent: 3852541 (1974-12-01), Altenberger
patent: 3959605 (1976-05-01), Jurschak
patent: 4024360 (1977-05-01), Biraghi et al.
patent: 4037220 (1977-07-01), Beyersdorf

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