40
Garbled terminal display
If terminal display is garbled, check that the following settings are configured for the terminal, for
example, HyperTerminal:
•
Baud rate—9,600
•
Data bits—8
•
Parity—none
•
Stop bits—1
•
Flow control—none
When you modify the settings for the console port of the switch, configure the same settings for the
console terminal.
Troubleshooting the switch during the operation
At the CLI, you can use related commands to display the switch information and locate the failures.
When you detect configuration errors, re-configure the switch or restore the factory settings for the
switch.
Power supply system failure
NOTE:
After the power supply to the power supply is turned off, the LEDs stay on for a period of time.
When the switch operates properly, the LEDs on the power supply (AC LED and DC LED) are green. For
more information, see the chapter “
Appendix C LEDs
.”
When the LEDs are off or not green, the power supply does not work properly. To troubleshoot the
power supply system:
1.
When the DC LED is orange, the power supply is over-temperature and enters the self-protection
state. Make sure the switch is well ventilated and operates in a proper environment.
2.
When the DC LED is red, the power supply may encounter output short circuit, output over-current,
output over-voltage, input under-voltage, or remote disconnection, and enters the self-protection
state. Remove the failures mentioned above. The DC LED is also red when the input of the power
supply is disconnected and the other power supplies in the chassis work normally. In this case, you
can connect the input or keep the input disconnected as needed.
3.
Check the power cable connections. If a power cable is loose, re-plug the power cable. If a power
cable is broken, replace it.
4.
Check the power supply installation. If the power supply is not fully seated, re-install the power
supply to make sure it has a close contact with the backplane of the switch.
5.
Check the power supply system. Make sure that the power supply system works properly and
provides a normal voltage.
6.
If the switch has empty power supply slots, unplug the power supply, plug the power supply into an
empty power supply slot after all LEDs on the power supply are off, and check whether the power
supply can work properly.
