TELEPHONE SYSTEM AND METHOD OPERATED FROM CENTRAL OFFICE LOOP CURRENT

摘要

TELEPHONE SYSTEM AND METHOD OPERATED FROM CENTRAL OFFICE LOOP CURRENT A telephone having a hook switch is coupled to tip and ring conductors for receiving loop current from a central office responsive to an off-hook condition at the hook switch. The electronic circuity within the telephone for facilitating various functions is powered entirely from the loop current flowing from the central office during the offhook condition.