Telephone line transfer circuit

Details Telephone line transfer circuit Telephone line transfer circuit

1974-11-11

1976-06-22

Brown, Thomas W.

179 18BE, H04M 354

Patent

active

039653064

ABSTRACT:
Transfer of an incoming call on a first telephone line for a first subscriber set to a second, independent telephone line for a second subscriber set is accomplished without permitting a party at the first subscriber set to listen to the transferred call. An adjustable time delay circuit causes the tip and ring leads of the first central office telephone line to be switched to the second subscriber set, after a predetermined amount of ringing at the first subscriber set. If the second subscriber set is in use or is being rung at the time a transfer is to take place, no switching occurs. If the first subscriber set is answered before the preset time delay is elapsed, no switching occurs. The line transfer circuit may operate from either a -24 or -48 volt DC supply. Upon transfer of the first pair of tip and ring central office lines to the second subscriber set, the second pair of tip and ring central office lines are isolated and terminated with a capacitor suitably chosen to represent a high impedance ringer.

REFERENCES:
patent: 3041405 (1962-06-01), Lomax
patent: 3704346 (1972-11-01), Smith et al.
patent: 3825699 (1974-07-01), Danner
patent: 3858008 (1974-12-01), Remec

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