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Bosch Building Technologies

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    How to Diagnose "Phone Line Fail" D7212B & D9112B Panels

    Issue

    What voltage and current is the phone line monitor measuring to sense trouble on the phone line on the D7212B/D9112B panels?
     
    Solution
     
    The phone line monitor senses trouble when the voltage on the line falls below 4.5 to 7.5 VDC, or in the off-hook condition when the current is 8 to 13mA.
    Version history
    Revision #:
    2 of 2
    Last update:
    ‎08-06-2018 08:34 PM
    Updated by:
     
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