Telephone system and method operated from central office loop cu

Details Telephone system and method operated from central office loop cu Telephone system and method operated from central office loop cu

1986-12-22

1989-08-22

Schreyer, Stafford D.

Telephonic communications

With check operated control

At terminal station

379387, 379413, H04M 1700, H04M 1900

Patent

active

048603465

ABSTRACT:
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 circuitry within the telephone for facilitating various functions is powered entirely from the loop current flowing from the central office during the off-hook condition; with loop current being maintained after termination of the off-hook condition in order to perform certain call functions.

REFERENCES:
patent: 4169216 (1979-09-01), Overdulve et al.
patent: 4547629 (1985-10-01), Corless
patent: 4595983 (1986-06-01), Gehalo et al.
patent: 4625078 (1986-11-01), Crouch et al.
patent: 4636587 (1987-01-01), Zoerner
patent: 4675902 (1987-06-01), Boeckmann

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