User Guide

Chapter 7. Troubleshooting 231
Chapter 7. Troubleshooting
Software problems usually occur when the router’s software configuration contains incomplete or incorrect
information. This chapter discusses:
• Diagnostic tools that are available to help identify and solve problems that may occur with your router
• Symptoms of software configuration problems
• Actions for you to take
• System messages
Diagnostic Tools
Using LEDs
Most hardware problems can be diagnosed and solved by checking the LEDs on the front panel of your router.
The following table summarizes the
normal
LED sequence in the left column (five consecutive states) from
Power On
to
Ready State
. The right column lists suggestions for problems reflected by an “abnormal” LED state
(no progression to the next state).
Note that this normal progression involves:
PWR LED (power LED)
TEST LED (self-test indicator LED)
LINK LED (modem link)
If the Power (PWR) light is off:
• Check that the power cord is firmly plugged into the back panel of the router and the other end into an active
AC wall or power-strip outlet.
• Check that the power switch is turned on.