Allied Telesis AT-2874SX - Manual (Page 24)

AT-2874SX Gigabit Ethernet Fiber ExpressCard Installation and User’s Guide
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Figure 8. Removing the Plate
5. When installing the ExpressCard in the 54mm Express Card slot,
attach the stabilizer to the card as shown in Figure 9.
Note
When installing the ExpressCard in the 34mm ExpressCard slot,
skip this step.
Figure 9. Attaching the Stabilizer to the AT-2874SX ExpressCard
6. Applying even pressure at both corners of the ExpressCard, push the
card until it is firmly seated in the PCI ExpressCard slot. Figure 10 on
page 25 shows how to insert the card in the 54mm slot.
The ExpressCard fits snugly into the slot.