Allied Telesis AT-SBx31CFC960 - Manual (Page 135)

SwitchBlade x3106 Chassis Switch and AT-SBx31CFC960 Card Installation Guide
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Figure 78. Removing an Ethernet Line Card from an Anti-static Bag
4. Align the line card with the internal chassis card guides in the selected
slot of the AT-SBx3106 Chassis.
Figure 79 shows an Ethernet line card aligned in slot 0.
Figure 79. Aligning an Ethernet Line Card in a Chassis Slot