Allied Telesis AT-SBx81CFC960 - Manual (Page 249)

SwitchBlade x8106 Chassis Switch and AT-SBx81CFC960 Card Installation Guide
Section II: Installing the Chassis 249
instructions, refer to “Installing the Blank Slot Covers” on page 140.
 If you do not plan to immediately install the card in another chassis,
continue with this procedure.
8. Store the line card in an anti-static bag.
9. Return the line card to its shipping container.