User's Manual

Troubleshooting
29
(left) blinks to indicate Ethernet activity. All LEDs should light as green. For all
other conditions, refer to the following table.
Indication Possible Cause What to Do
Power and Status LEDs
for cards installed in
front or back of NCU
are not lit
no power to NCU
• Verify that the power cord is
installed and properly seated.
• Verify that the power source is
operational.
• Contact Customer Support.
Status LED is red—top
front card only
timing source not
available
• Connect the timing source. In
iDEN installations, this is usually
the iSC. In some cases, the timing
source is the GPS antenna.
• If the timing source is connected,
check all connections.
failed initialization
• Reboot the system: unplug the
NCU, and plug it in again. Boot
up may take several minutes.
fan is not working
• Verify that the fan is operational.
• If the fan is not working, unplug
the NCU and contact Customer
Support.
Status LED is red—any
card
card is not operational
• Remove and reseat card.
• Contact Customer Support for a
replacement card.