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Detecting Loss of Phone Line

Subject: Detecting Loss of Phone Line
From: oldman@xxxxxxxxxxx
Date: Sun, 17 Sep 2006 23:59:40 -0400
Newsgroups: alt.security.alarms

How do typical alarm panels DETECT that the phone line that is routed
through them is be unavailable/inoperative? Do they periodically
sample or continuously measure/detect? What do they measure?

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  - From: Roland Moore
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  - From: Stanley Barthfarkle

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