Line hold circuits

Details Line hold circuits Line hold circuits

1979-05-25

1981-03-24

Robinson, Thomas A.

179 81R, H04M 322, H04M 100

Patent

active

042582326

ABSTRACT:
A single line hold circuit adapted for connection between the tip and ring leads of a telephone line. The circuit comprises impedance means for connection between the tip and ring leads, the impedance means including a semiconductor element having high and low impedance states, the impedance of the low impedance state being sufficiently small to maintain the telephone line in a hold condition. The circuit further comprises means for causing the semiconductor to be in its low impedance state following an interruption of a predetermined length of time in loop current. A double line hold circuit is also illustrated.

REFERENCES:
patent: 3742151 (1973-06-01), Ruether
patent: 3870831 (1975-03-01), McCarley
patent: 4093829 (1978-06-01), Silberman

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