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7 Troubleshooting
Troubleshooting the Power System
Symptom:
The PWR LED RUN is OFF or blinking.
Solution:
Check that:
z The power switch on the router is turned on.
z The switch of the power source is turned on.
z The power cord is correctly connected.
z The power source meets the requirement of the router. If the PSU is DC-input, check the AC/DC
OK LED: steady ON means the input voltage is normal. OFF means the input voltage is abnormal.
Troubleshooting the Configuration System
If the router passes POST after powered up, the console screen displays the startup banner; if faults
occur to the configuration system, the console screen displays nothing or only illegible characters.
Troubleshooting the console terminal
Symptom:
After the router is powered on, the console screen displays nothing.
Solution:
Step 1: Check that:
z The power system is normal.
z The console cable is correctly connected.
Step 2: Check the console cable and the terminal (HyperTerminal for example) settings.
Troubleshooting the console terminal
Symptom:
After the router is powered on, the console screen displays illegible characters.
Solution:
Verify that the terminal settings are as follows:
Baud: 9600
Data bits: 8
Stop bit: 1
Parity: None
Flow control: None
Terminal emulation: VT100
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