Resetting circuit in a key-telephone system

Details Resetting circuit in a key-telephone system Resetting circuit in a key-telephone system

1989-07-31

1991-08-20

Ng, Jin F.

Telephonic communications

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

Switching or supervision feature

379412, 379413, H04M 100

Patent

active

050420658

ABSTRACT:
There is disclosed a resetting circuit of a key telephone system (KTS) capable of preventing data error caused by unstable power supply and instantaneous power-off of a key system unit (KSU), by adjusting a DC voltage of the key telehpone system, said DC voltage is applied to a reset terminal of a microprocessor in the key telephone system. The invention includes a power supply for supplying power to the KSU and KTS, a microprocessor for controlling the overall operation of the KTS, a first detecting means for detecting the voltage change of a first voltage Vcc1, and a second detecting means for detecting the voltage change of a second voltage Vcc2.

REFERENCES:
patent: 4887293 (1989-12-01), Molnar

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