3com 4800G Installationsanweisungen

C

HAPTER

 6: M

AINTENANCE

 

AND

 T

ROUBLESHOOTING

You can check whether the power system of the switch fails by viewing the PWR 
LED on the front panel. When the power supply system functions normally, the 
PWR LED should be ON. Otherwise, please check whether

■

The switch power cable is properly connected.

■

The power supply meets the requirement.

After the switch is powered on and the system is normal, the booting information 
will be displayed on the configuration terminal. If the configuration system has any 
faults, there will not be any screen display at the configuration terminal or the 
displayed characters will be totally illegible.

If there is no output information after the configuration is powered on, please 
check whether:

■

The power supply is normal

■

The console cable is properly connected

If no problems are found after the above-mentioned items have been checked, the 
cause may lie in the console cable or the settings of the terminal (such as hyper 
terminal) parameters. Please perform the corresponding check.

If there is illegible display at the configuration terminal, the cause might lie in the 
parameter setting error at the terminal (such as HyperTerminal). Verify the 
following terminal parameter (such as hyper terminal) settings:

■

Baud rate: 9,600

■

Data bits: 8

■

Parity: none

■

Stop bits: 1

■

Flow control: none

■

Emulation: VT100.