Telephone Line Monitor - Bosch B5512 Reference Manual

Control Panel
Figure 7.2: RJ31X wiring
Callout ᅳ Description
1 ᅳ Outside Telco
2 ᅳ Premises telephone
3 ᅳ Bar short removed on Telco connector block insertion – positions 1 and 4 and 5 and 8
4 ᅳ RJ31X jack
5 ᅳ Telco connector block
6 ᅳ To control panel
7.3

Telephone line monitor

The B430 module has a built-in telephone line monitor that tests the telephone line for voltage
and current. The normal voltage on a telephone line is approximately 48 VDC (24 VDC for
some telephone systems).
If the module senses trouble, it starts a programmable telephone line trouble timer, which
continues to run as long as the monitor detects trouble. It resets to zero when the control
panel senses a normal line. If the timer reaches the delay time in the Phone Supervision
program item, it begins a telephone line trouble response. Programming determines what the
response is. For programming information, refer to Phone Parameters in RPS Help or in the
control panel Program Entry Guide.
Notice!
Bad Line Might Test OK
The telephone line monitor uses voltage levels to test the status of the telephone line. In
some instances, a given telephone line might be out of service without affecting the voltage
on the line. The telephone line monitor cannot recognize this trouble condition.
Bosch Security Systems, Inc.
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Installation and System Reference Guide
Telephone communications | en
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2015.07 | 12 | F.01U.287.180