D9000/D7000 Series Operation & Installation Manual
Page 24
74-07692-000-C 4/97
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 phone lines, and
communication failure. See Figure 10. When
programmed and operating normally, only the
green AC power status LED should be 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 up when phone line voltage drops
below 4.5 to 7.5 VDC without a corresponding 8-
13 mA increase in current. The panel monitors
the faulty phone line for the programmed interval
before indicating a trouble condition. See
Phone
Line Monitor
in this section 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 is cleared when communications restores.
See
Communication Failure
in this section.
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