Allied Telesis AT-SBx31CFC960 - Manual (Page 133)

SwitchBlade x3106 Chassis Switch and AT-SBx31CFC960 Card Installation Guide
133
Figure 77. Tightening the Thumb Screws on the AT-SBx31CFC960 Card
10. Tighten the screws with a # 2 Phillips-head screwdriver to secure the
controller card to the chassis.
Allied Telesis recommends tightening the screws to 5 inch-lbs.
11. if you have a second AT-SBx31CFC960 Controller Fabric Card, repeat
steps 1 to 9 to install it in the chassis.
12. Go to “Installing the Ethernet Line Cards” on page 134.