Order wire in telephone communication system

Details Order wire in telephone communication system Order wire in telephone communication system

1993-02-18

1996-07-02

Chin, Stephen

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Using portable test set

379 1, 379 7, 379 8, 379 12, 379 35, H04M 124, H04M 308, H04M 322

Patent

active

055330924

ABSTRACT:
A switchable order wire circuit installed in addition to a trunk connecting a master station which includes an exchanger and a dependent station in a telephone system. The order wire circuit includes a first telephone terminal located in the master station, a second telephone terminal located in the dependent station, and a pair of telephone lines connecting the first and second telephone terminals. The order wire circuit also includes a hooking detection system installed in the master station, for detecting a hooking operation of the second telephone terminal. In addition, a circuit for switching the telephone lines from the first telephone terminal to a public line when the hooking operation is specifically detected is included. The hooking operation is generally specified by an on-hook state of the second telephone terminal after a first off-hook state is determined to be shorter than a first predetermined period and the first predetermined period terminates within a second predetermined period measured after the first off-hook operation of the second telephone terminal.

REFERENCES:
patent: 4029913 (1977-06-01), Gunderson
patent: 4159402 (1979-06-01), De Graauw
patent: 4611100 (1986-09-01), Schembri
patent: 4760592 (1988-07-01), Hensley
patent: 4837811 (1989-06-01), Butler
patent: 5063563 (1991-11-01), Ikeda et al.
patent: 5157708 (1992-10-01), Garthwaite
patent: 5166970 (1992-11-01), Ward
patent: 5195124 (1993-03-01), Ishioka
patent: 5228072 (1993-07-01), Ingalsbe
patent: 5323449 (1994-06-01), Mori

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