Telephone-line dedicating apparatus

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.

Dependencies are inferred from the claim text.