Electronic telephone subscriber set with voltage controlled vari

Details Electronic telephone subscriber set with voltage controlled vari Electronic telephone subscriber set with voltage controlled vari

1975-02-11

1976-08-03

Cooper, William C.

H04M 100

Patent

active

039730824

ABSTRACT:
An electronic telephone subscriber set which is suitable for co-operation with a telephone exchange incorporating supply resistors, the values of which are substantially higher during the detection of the closed
on-closed conditions of a subscriber loop than during the speech condition and which is provided with an adjustable direct current resistor connected across the line connection terminals and a current detector coupled thereto for adjusting the direct current resistor to one of two values in dependence of the line current in order to enable optimum detection of the closed
on-closed conditions of the subscriber loop.

REFERENCES:
patent: 3035122 (1962-05-01), Livingstone
patent: 3627952 (1971-12-01), Person
patent: 3800095 (1974-03-01), Cowpland

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