Circuit for monitoring battery voltages of telephone terminal fa

Details Circuit for monitoring battery voltages of telephone terminal fa Circuit for monitoring battery voltages of telephone terminal fa

1998-05-05

2000-07-04

Hudspeth, David R.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379399, H04M 100

Patent

active

060849614

ABSTRACT:
A circuit for monitoring battery voltages of a telephone terminal facility is disclosed. This circuit mainly includes a ringing detection circuit for generating a pulse signal in response to an off-hook signal or a ringing signal, a power detecting circuit for detecting battery voltages and a latch being in series connection with the power detecting circuit for outputting a signal showing a status of the detected battery voltages. The power detecting circuit and the latch are of an edge-triggered type and are activated only when a handset of a telephone is picked up or a ringing signal is received so that both the consumed power and the voltage variations are low.

REFERENCES:
patent: 4914689 (1990-04-01), Quade et al.
patent: 5157711 (1992-10-01), Shimanuki

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