TELEPHONE LINE INTERFACE

摘要

A telephone line interface circuit (10) including a diode bridge for electrically coupling on-hook and off-hook signals between a telephone line and an intermediate signal path, and two optical couplers serially connected within the intermediate signal path for simultaneously optically coupling incoming and outgoing signals therefrom and thereto, respectively. An incoming signal, either on-hook or off-hook, can be coupled from the telephone line while an outgoing signal is simultaneously being coupled to the telephone line. The solid state design of the circuit (10) allows for integration thereof into a single integrated circuit chip.