Allied Telesis AT-SBx81CFC960 - Manual (Page 136)

Chapter 7: Installing the AT-SBx81CFC960 Control Card and Ethernet Line Cards
136 Section II: Installing the Chassis
Figure 75. Aligning an Ethernet Line Card in a Chassis Slot
5. 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 64 on page 127.
Caution
Do not force the card into the slot. If you feel resistance, remove the
card 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 76 on page 137.