Loop extender

Details Loop extender Loop extender

1977-04-11

1978-12-19

Claffy, Kathleen H.

H04Q 130

Patent

active

041307356

ABSTRACT:
A loop extender for adding a series-aiding boost voltage to a subscriber loop of a telephone system and having a d.c. boost voltage supply, an amplifier circiit having an active device connecting the voltage supply in series with a conductor of said loop for applying to the loop a magnitude of boost voltage that is dependent upon the gain of the amplifier circuit, and a further circuit, including a feedback for the amplifier circuit, for controlling the gain of said amplifier circuit in such a way that said gain is increased to cause an increase in the applied boost voltage in response to a rise in the magnitude of the loop current to a first predetermined threshold and/or in such a way that said gain is decreased to cause a decrease in the applied boost voltage in response to a decrease in the magnitude of the loop current to a second predetermined threshold.

REFERENCES:
patent: 3508009 (1970-04-01), Henry et al.
patent: 3763320 (1973-10-01), Chambers, Jr.
patent: 3781480 (1973-12-01), Roge

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