Allied Telesis x950 Series Installation Manual page 160

Chapter 11: Troubleshooting
160
and 1/2.5/5/10Gbps. The cards do not support 10Mbps devices.
If the XEM2-12XT Card cannot establish links with 100Mbps

devices, the switch might have an earlier version of the AlliedWare
Plus management software. Support for 100Mbps devices on the
XEM2-12XT Card was added in version 5.4.9-1. Use the SHOW
VERSION command to display the version number. If necessary,
update the management software.
Try connecting another network device to the twisted pair port with

a different cable. If the twisted pair port is able to establish a link,
then the problem is with the cable or the other network device.
Verify that the twisted pair cable does not exceed 100 meters (328

feet).
Verify that you are using the appropriate category of twisted pair

cable. Cable requirements are listed in "Cabling Twisted Pair
Ports" on page 130.
Verify that the port is connected to the correct twisted pair cable.

Note
An 1GBase/10GBase connection may require five to ten seconds to
establish a link.
Problem 9: The switch overheats and shuts down.
Solutions: Try the following:
Verify that the location of the switch allows for adequate airflow.

If the switch is operating, use the SHOW SYSTEM

ENVIRONMENT command in the Privileged Exec mode to verify
that the power supplies and fan modules are operating properly.
Problem 10: The switch functions intermittently.
Solutions: Try the following:
Use the SHOW SYSTEM ENVIRONMENT command in the

Privileged Exec mode to verify that the input voltage from the
power source to the switch is stable and within the approved
operating range. The unit will shut down if the input voltage
fluctuates above or below the approved operating range.
Use the SHOW SYSTEM ENVIRONMENT command to verify that

the fan modules are operating correctly.
Verify that the location of the switch allows for adequate airflow.

The unit will shut down if it is overheating.
Problem 11: The Switch ID LED in the management panel is flashing "F."
Solutions: One of the following problems has occurred: