Allied Telesis AT-2911 Series Adapters - Manual (Page 37)

AT-2911 Series Gigabit Ethernet Network Adapters Installation and User’s Guide
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6. Applying even pressure at both corners of the card, push the adapter
card until it is firmly seated in the PCIe slot you have selected.
Make sure the card is securely seated. See Figure 13.
Figure 13. Inserting the Network Adapter Card
Caution
Do not use excessive force when seating the card, because this may
damage the system or the adapter. If the card resists seating,
remove it from the system, realign it, and try again.
7. Secure the network adapter card to the chassis with a Phillips-head
screw (not provided) as shown in Figure 14 on page 37.
Figure 14. Securing the Adapter Card