Subscriber line interface circuit utilizing impedance synthesize

Details Subscriber line interface circuit utilizing impedance synthesize Subscriber line interface circuit utilizing impedance synthesize

1980-09-22

1982-03-02

Robinson, Thomas A.

179 18FA, H04M 1900

Patent

active

043179630

ABSTRACT:
A subscriber line interface circuit is described wherein current supplied to a telephone subscriber line from a shared voltage source such as a DC/DC converter is regulated thereby permitting a regulated line current to be supplied to a plurality of line circuits from a single shared voltage source. In accordance with the present invention, both the dc line feed and the ac transmission requirements of a subscriber line interface circuit for a telephone exchange are implemented in a single circuit incorporating ac and dc impedance synthesis techniques. A significant reduction in the heretofore required expensive and bulky discrete components of the subscriber line interface circuit is achieved.

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