Telephone circuitry with power backup

Details Telephone circuitry with power backup Telephone circuitry with power backup

H - Electricity

04

M

379/63

H04M 19/00 (2006.01) H04M 19/08 (2006.01)

Patent

CA 1248651

ABSTRACT OF THE DISCLOSURE Telephone signal processing and handling circuitry, including a CPU (central processing unit) powered from a local power supply, is provided with a backup power supply battery. With power failure, the battery only supplies power to a limited portion of the overall circuitry to provide limited telephone service which is not dependent on the CPU. As a result, the system may have a much smaller backup supply than would be required by the CPU. To further lessen the drain on the battery two circuits are separately powered by the battery. The first circuit is connected to the battery when local power is interrupted. That circuit permits recognition of incoming calls and initiation of outgoing calls. A second, more extensive circuit is only powered when a call is to be completed to or from the telephone circuitry.

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