Power circuit for telephone accessory devices

Details Power circuit for telephone accessory devices Power circuit for telephone accessory devices

1988-07-27

1989-07-11

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379387, H04M 1900

Patent

active

048478997

ABSTRACT:
A power circuit for supplying power to a device, which is connected in parallel with a telephone to a telephone line to that power is normally supplied to it from the central telephone office, includes batteries and a switching circuit such that the power source for the device is switched to these batteries when a voltage drop in the normal power source is detected.

REFERENCES:
patent: 4591666 (1986-05-01), Boeckmann
patent: 4636588 (1987-01-01), Nakayama et al.
patent: 4647787 (1987-03-01), Pommer, II
patent: 4675902 (1987-06-01), Boeckmann

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