A circuit to provide backup telephone service for a multiple...

Details A circuit to provide backup telephone service for a multiple... A circuit to provide backup telephone service for a multiple...

H - Electricity

04

M

H04M 11/06 (2006.01) H04M 19/00 (2006.01)

Patent

CA 2359340

The present invention relates to a safety device for multiple access subscriber link over a wire pair connecting a subscriber server to at least first and second network interfaces. The first network interface has a port that is directly connectable by a conductor to a telephone such that the telephone is operable without power being supplied from the telephone. The device is comprised of a remote modem at the second network interface connected to the subscriber link. A local modem of the server is provided in communication with the remote modem over the subscriber link. A telephone is provided which uses a first portion of a frequency spectrum of the subscriber link. The local modem and the remote modem use a second portion of the frequency spectrum. The telephone is connected directly to the remote modem through the wire pair at a remote end. The remote end of the wire is one of connected to the port one of directly and selectably through a switch.

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