Allied Telesis AlliedWare Plus x950 Series Installation Manual page 201

 If the problem is with an 100Gbps transceiver, you might need to
adjust the Forward Error Correction (FEC) parameter on the port,
with the FEC command. Refer to the Software Reference for x950
Switch, AlliedWare Plus Operating System.
Problem 5: A 4x10Gbps breakout cable in port 25, 29, 33, or 37 cannot
establish links with network devices.
Solutions: Try the following:
 Check that the cable is fully inserted in the port.
 Verify that the breakout cables are securely connected to the ports
on the network devices.
 Use the SHOW PLATFORM command to confirm that the port is
configured for a breakout cable. If necessary, use the PLATFORM
PORTMODE INTERFACE command to configure the port. For
more information, refer to "PLATFORM PORTMODE INTERFACE"
on page 134.
 If the port previously had a 100Gbps transceiver, you must reset
the switch after configuring it for a breakout cable.
Problem 6: An XEM2 line card in the expansion slot is not functioning.
Solutions: Try the following:

Visually inspect the card to verify that it is fully inserted into the
expansion slot.
 If the problem is with an AT-XEM2-12XTm Card, the switch might
have an earlier version of the AlliedWare Plus software that does
not support the card. The card requires v5.4.9-1 or later. Use the
SHOW VERSION command to display the version number.

Try installing the card in a different switch. If it still does not work,
the problem is probably with the card. Replace the card.
 Try installing a different card in the switch. If the replacement card
fails to work, the problem is probably with the switch. Contact your
Allied Telesis sales representative for assistance.
Problem 7: An SFP, SFP+, or QSFP+ transceiver in an XEM2 line card is
unable to establish a link to another network device.
Solutions: Try the solutions to Problem 3.
Problem 8: A port on an AT-XEM2-12XT or AT-XEM2-12XTm Line Card
cannot establish a link with a network device.
Solutions: Try the following:

Verify that the network device connected to the twisted pair port is
powered on and is operating properly.
x950 Series Installation Guide for VCStack
201