Patent
1977-10-25
1979-03-06
Claffy, Kathleen H.
179 16F, H04M 100
Patent
active
041432479
ABSTRACT:
There are provided a current detecting resistance element connected in series with a loop for supplying current to a telephone set, a switching circuit including a three terminal semiconductor switching element connected to be ON.OFF controlled by the voltage drop across the resistance element, and an impedance element controlled by the ON.OFF operation of the switching element to be connected across the loop for adding AC loss.
REFERENCES:
patent: 3989902 (1976-11-01), Coupland
Kato Kazumi
Kawashima Isao
Kishimoto Hideo
Terai Masaaki
Yoshitoshi Makoto
Claffy Kathleen H.
Nippon Telegraph and Telephone Public Corporation
Pfund Charles E.
Popek Joseph A.
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