Allied Telesis NETEXTREME II AT-2973SX - Manual (Page 36)

Chapter 2: Installing the Hardware
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4. Remove the network adapter card from the shipping package and
store the packaging material in a safe location.
Caution
Wear a grounding device and observe electrostatic discharge
precautions when installing the network adapter card in a system.
Failure to observe this caution could result in damage to the card.
5. Applying even pressure at both corners of the card, push the adapter
card until it is firmly seated in the appropriate PCI slot.
Make sure the card is securely seated. To insert the network adapter
card, see Figure 11.
Figure 11. Inserting the Adapter with a High-profile Bracket
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.
6. Secure the network adapter card to the chassis with a Phillips-head
screw (not provided). See Figure 12 on page 37.