Hazard prevention for telephone line interface circuits

Details Hazard prevention for telephone line interface circuits Hazard prevention for telephone line interface circuits

1994-02-10

1997-09-09

Chiang, Jack K.

Telephonic communications

Subscriber line or transmission line interface

379413, 379418, 379252, H04M 100, H04M 300

Patent

active

056664060

ABSTRACT:
A telephone line interface circuit comprises a controlled voltage generator for selectively generating a ringing voltage waveform for a telephone line or a supply voltage for a drive circuit for the telephone line, and a switching circuit interconnecting an output of the controlled voltage generator, the drive circuit, and the telephone line accordingly. In order to avoid creating a potentially hazardous condition on the telephone line, an interlock is provided between enabling of the controlled voltage generator and switching of the switching circuit, and software and hardware monitoring functions monitor operation of the control software and the controlled voltage generator and disable the controlled voltage generator in response to fault conditions or unusual behavior.

REFERENCES:
patent: 4922526 (1990-05-01), Morganstein et al.
patent: 5027391 (1991-06-01), O'Neill et al.
patent: 5260996 (1993-11-01), Dillon et al.

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