Allied Telesis AT-2931SX - Manual (Page 27)

AT-29xxSX Series Gigabit Ethernet Network Adapters Installation Guide
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Make sure the card is securely seated. See Figure 3.
Figure 3. Inserting the Network Adapter Card
Note
The connector dock in a 32-bit PCI slot is shorter than in a 64-bit PCI
slot. Although the AT-29xxSX series adapter is designed to fit in
either slot type, when installed in a 32-bit PCI slot, part of the
adapter’s connector edge remains undocked. This is part of normal
operation.
Caution
Do not use excessive force when seating the card, as this may
damage the system or the adapter. If the card resists seating,
remove it from the system, realign it, and try again.