Allied Telesis AT-SBx81CFC400 Installation Manual page 223

SwitchBlade x8112 Chassis Switch and AT-SBx81CFC400 Card Installation Guide
If the problem is with the AT-SBx81XLEM Line Card, verify that the version
of the AlliedWare Plus Operating System on the AT-SBx81CFC400
Controller Fabric Card supports the card. The card requires version 5.4.6-
1 or later. To determine the version number of the operating system on the
controller card, start a management session on the chassis and issue the
SHOW SYSTEM command in the Privileged Exec mode. If necessary,
update the operating system on the controller card.
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