Allied Telesis AT-8000S 사용자 설명서

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This chapter contains information on how to troubleshoot the switch in the event that a problem occurs.

Note

If you are still unable to resolve the problem after following the instructions in this chapter, contact ATI 
Technical Support for assistance.

Check the PWR LED on the front of the switch. If the LED is OFF, indicating that the unit is not receiving power, do 
the following:

Ensure that the power cord is securely connected to the power source and to the AC connector on the back 

panel of the switch.

Verify that the power outlet has power by connecting another device to it.

Try connecting the unit to another power source.

Try using a different power cord.

Verify that the voltage from the power source is within the required levels for your region.

Verify that the LNK/ACT LED for each port is ON. If a LNK/ACT LED is OFF, do the following:

Verify that the end-node connected to the port is powered ON and is operating properly.

Verify that the twisted pair cable is securely connected to the port on the switch and to the port on the end-

node.

Ensure that the twisted pair cable does not exceed 100 meters (328 feet).

Verify that you are using Category 5 twisted pair cable.

Be sure the switch is powered up.

Check network cabling between the management station and the switch.

Check that you have a valid network connection to the switch and that the port you are using has not been 

disabled.

Be sure you have configured the VLAN interface through which the management station is connected with a 

valid IP address, subnet mask and default gateway.

Be sure the management station has an IP address in the same subnet as the switch’s IP interface to which it 

is connected.

If you are trying to connect to the switch via the IP address for a tagged VLAN group, your management 

station, and the ports connecting intermediate switches in the network, must be configured with the 
appropriate tag. 

If you cannot connect using Telnet, you may have exceeded the maximum number of concurrent Telnet/SSH 

sessions permitted. Try connecting again at a later time. 

Contact ATI Technical Support for assistance.