Subscriber line interface circuit

Details Subscriber line interface circuit Subscriber line interface circuit

H - Electricity

04

M

379/63

H04M 19/00 (2006.01)

Patent

CA 1175966

? Abstract of the Disclosure 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 ac line feed and the ac trans- mission requirements of a subscriber line interface cir- cuit for a telephone exchange are implemented in a single circuit incorporating ac and dc impedance synthesis tech- niques. A significant reduction in the heretofore required expensive and bulky discrete components of the subscriber line interface circuit is achieved.

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