Allied Telesis SwitchBlade x3106 - Manual (Page 126)

Chapter 5: Installing the AT-SBx31CFC Card and Ethernet Line Cards
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5. Slowly and carefully slide the card into the slot.
Caution
Keep the card level with the chassis as you slide it into the slot. You
might damage the components on the top or bottom of the card if
you slide it in at an angle. Refer to Figure 70 on page 117.
Caution
Do not force the AT-SBx31CFC Card into the slot. If you feel
resistance, remove it and try again. Be sure that the edges of the
card are properly aligned with the card guides.
6. When you feel the line card make contact with the connector on the
backplane of the chassis, gently press on both sides of the faceplate to
seat the card on the connector. Refer to Figure 81.
Figure 81. Seating an Ethernet Line Card on the Backplane Connector
7. Finger tighten the two thumbscrews on each side of the line card to
secure it to the chassis, as shown in Figure 82 on page 127.