Method and apparatus for sensing external alarms using a standard telephony interface
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United States of America Patent
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-
Aug 10, 1999
Grant Date -
N/A
app pub date -
Dec 20, 1996
filing date -
Dec 20, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A private branch exchange is provided having the capability of receiving external alarms via the standard telephony line or trunk interfaces. According to one embodiment, a PBX 200 includes a switching control circuit 202 having line monitor 212 and DTMF 210 capabilities. The switching control circuit 202 is coupled to a central processing unit 204 which in turn is coupled to a memory 206. The memory 206 stores a database 208 identifying a predetermined number of telephony trunk 214 and/or line input/output circuits 218 over which external alarms are to be reported. The CPU 204 identifies an external alarm contact closure as a fault on the telephone line or trunk, thereby insuring proper identification of the location of the alarm.
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