Emergency alarming apparatus

Details Emergency alarming apparatus Emergency alarming apparatus

1998-10-07

2000-05-23

Woo, Stella

Telephonic communications

Emergency or alarm communications

Responsive to sensed nonsystem condition

379 33, H04M 1100

Patent

active

060673451

ABSTRACT:
An emergency alarming apparatus for detecting a resistive short-circuit between a pair of telephone lines. When the continuation of a dial tone more than a predetermined time period or the generation of a busy tone is recognized but a line current is not detected, the apparatus stops the transmission of a monitor signal to the telephone lines.

REFERENCES:
patent: 4741022 (1988-04-01), Chebra et al.
patent: 4969178 (1990-11-01), Chen et al.
patent: 5062131 (1991-10-01), Kanare et al.
patent: 5737391 (1998-04-01), Dame et al.
patent: 5901201 (1999-05-01), Schull

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