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17
®
4550-CF
INSTALLATION (cont.)
C. LEDs
UL Note: the LEDs inside the product are for installer use only. They may not be
used to comply with any specitic UL section.
Normal Mode: Upon initial power up, the 5 LEDs on the 4550 will begin to function
as follows:
LED
LED STATUS
LED
MEANING
Power LED (#1)
OFF
No AC power is present
GREEN
On
AC power is present
Flashing
Operating on Battery power only (all other
LEDs are disabled)
RED
Flashing
Operating on AC power and no battery is
connected or the battery voltage is lower
than 10.2 V
OR
Operating on battery power only and the bat-
tery voltage is less than 10.2V (all other LEDs
are disabled).
Telco LED (#2)
OFF
Phone line is not monitored
GREEN
On
Phone line is OK (Telco primary mode), Panel
or Extension is on-hook
Flashing
Panel or Extension Line is off-hook
RED
On
Phone line Trouble Condition
(INSTALLATION continued next page)