Telephone switch hook interface circuit

Details Telephone switch hook interface circuit Telephone switch hook interface circuit

1996-11-19

1999-01-12

Hunter, Daniel S.

Telephonic communications

Subscriber line or transmission line interface

379377, 379378, 379382, 379 9305, 37910608, 379 9328, H04M 100, H04M 1100

Patent

active

058599061

ABSTRACT:
A switch hook interface circuit couples a subscriber telephone to a subscriber telephone line. This interface circuit comprises a source of an off-hook signal, having one state indicating an off-hook condition, and a second state indicating an on-hook condition. A circuit is coupled between the off-hook signal source and the subscriber telephone line which gradually increases the current drawn from the subscriber telephone line when the off-hook signal indicates an off-hook condition, and gradually decreases the current drawn from the subscriber telephone line when the off-hook signal indicates an on-hook condition.

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