Line hold circuits

Details Line hold circuits Line hold circuits

H - Electricity

04

M

379/33, 379/73

H04M 1/00 (2006.01) H04M 1/80 (2006.01) H04M 3/428 (2006.01)

Patent

CA 1154889

ABSTRACT OF THE DISCLOSURE A single line hold circuit adapted for connection between the tip and ring leads of a telephone line. The circuit comprises variable impedance devices for connection between the tip and ring leads, the impedance devices 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 causes 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.

347828

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