Allied Telesis AT-SBx81CFC960 - Manual (Page 218)

Chapter 11: Troubleshooting
218 Section II: Installing the Chassis
If the problem is with an AT-SBx81XS16 Line Card, try checking the
following items:
 Verify that the line card is installed in a supported slot in the AT-
SBx8112 Chassis. The supported line card slots for this card are
slots 1 to 4, 8, and 10. The card is not supported in slot 7, 9, 11, or
12. The controller card generates an error message if the line card
is installed in an unsupported slot.
 Verify that the chassis has the AT-SBx81CFC960 Controller Fabric
Card. The AT-SBx81XS16 Line Card is not compatible with the
AT-SBx81CFC400 Controller Fabric Card.