Telephone circuitry with power backup

Details Telephone circuitry with power backup Telephone circuitry with power backup

1985-03-25

1987-03-24

Dwyer, James L.

Telephonic communications

Multi-line or key substation system with selective switching...

Switching or supervision feature

379413, H04M 1908

Patent

active

046530886

ABSTRACT:
CPU based telephone circuitry allowing for enhanced telephone functions includes a battery backup. To minimize power drain from the battery, the battery only supplies limited circuitry required for limited telephone service without CPU support. To further limit power drain, power backup circuitry includes a first circuit limited to sensing of the hookswitch status and sensing of incoming calls and generation of a ringing sound. Based on the status of the hookswitch, additional amplifiers, dialers and the like required for the limited telephone service are then powered by the backup battery.

REFERENCES:
patent: 4503291 (1985-03-01), von Holten et al.

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