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3Com Router 3000 Ethernet Family
Installation Guide
4. Troubleshooting
4-1
Chapter 4 Troubleshooting
4.1 Troubleshooting the Power System
Symptoms:
POWER LED cannot light.
Solution:
Check that:
z The power switch of the router is turned on.
z The switch of the power source is turned on.
z The power cord of the router is properly connected.
z The correct power source is used.
Caution:
Do not plug/unplug the power cord when power is being supplied. If POWER LED is still OFF after you check against the
items listed above, contact your agent.
4.2 Troubleshooting the Configuration System
If the router is operating normally after it is powered on, it displays the start-up information on the
console terminal. If the configuration system has faults, it displays illegible characters or nothing at
all.
Symptoms 1:
Nothing is displayed on the terminal screen after the router is powered on.
Solution:
Step 1: Check that:
z The power system is correctly working.
z The console cable is connected correctly.
Step 2: Check the console cable and the terminal (such as the HyperTerminal) parameter settings.