Troubleshooting; Troubleshooting The Power System; Troubleshooting The Configuration System - 3Com MSR 50-40 ROUTER. Installation Manual

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Troubleshooting

Troubleshooting the Power System

Symptom:
The PWR LED RUN is OFF or blinking.
Solution:
Check that:
The power switch on the router is turned on.
The switch of the power source is turned on.
The power cord is correctly connected.
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, and OFF means the input voltage is abnormal.

Troubleshooting the Configuration System

If the router passes POST after powered on, the console screen displays the startup banner; if faults
occur to the configuration system, the console screen displays nothing or only illegible characters.
Symptom 1:
After the router is powered on, the console screen displays nothing.
Solution:
Step 1: Check that:
The power system is normal.
The console cable is correctly connected.
Step 2: Check the console cable and the terminal (HyperTerminal for example) settings.
Symptom 2:
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.
Reconfigure the parameters if their values are different.
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