Telephone-line dedicating apparatus

Details Telephone-line dedicating apparatus Telephone-line dedicating apparatus

1994-11-10

1996-03-26

Chan, Wing F.

Telephonic communications

Telephone line or system combined with diverse electrical...

379184, 379194, H04M 1100

Patent

active

055027601

ABSTRACT:
A telephone-line dedicating apparatus which is connected between an external telephone-line and a specified telephone-line utilization apparatus such as a telephone-set, facsimile machine or the like and which upon energization causes one or more other telephone-line utilization apparatus to be unable to function connected to said external telephone-line is disclosed. Specially, when said specified telephone-line utilization apparatus is a facsimile machine, any influence on said facsimile machine which is in use, due to noises from the other equipments connected to the same external telephone-line can be prevented. The telephone-line dedicating apparatus comprises: impedance insertion means for inserting impedance means across said external telephone-line to decrease the telephone-line DC voltage level, in response to the operative condition of said specified telephone-line utilization apparatus; and operating-current path setting means including a DC power supply and establishing an operating-current path from said DC power supply to said specified telephone-line utilization apparatus through said impedance means when said impedance means has been inserted across said external telephonel-ine.

REFERENCES:
patent: 4747128 (1988-05-01), Chan et al.
patent: 4807278 (1989-02-01), Ross
patent: 4825465 (1989-04-01), Ryan
patent: 5048073 (1991-09-01), Weiser et al.

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