D928 Status Leds - Bosch D9412G Operations & Installation Manual

6.0 Telephone Connections
D9412G/D7412G | Operation & Installation Guide | EN | 31
6. 1 2.5

D928 Status LEDs

Four LEDs mounted on the front edge of the D928
Module show the status of AC power for the panel, the
status of the two phones lines, and communication
failure (see Figure 11). When programmed and operating
normally, only the green AC power status LED is lit.
AC Power LED
The green AC Power Status LED lights when there is
AC power at Terminals 1 and 2 on the panel.
Phone Line Fail LEDs
Two yellow Phone Line Status LEDs (one for the
primary phone line, one for the secondary phone line)
light when phone line voltage drops below 3.0 VDC.
The panel monitors the faulty phone line for the
programmed interval before indicating a trouble
condition. See Section 6.8 Phone Line Monitor for a
description of phone line monitor operation.
Communication Failure LED
The yellow Communication Failure LED lights when
the system is in communication failure. The LED
darkens when communication restores. See Section 6.10
Communication Failure.
Bosch Security Systems | 10/03 | 43488E