Allied Telesis AT-2912T - Manual (Page 28)

Chapter 2: Installing the Hardware
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Figure 7. Removing the PC Cover
3. Select an empty, non-shared PCI slot and remove the faceplate.
Keep the faceplate in a safe place. You may need it for future use. See
Figure 8.
Figure 8. Removing the Faceplate From PCI Slot
Note
If you cannot locate or do not know how to find an appropriate PCI
slot, refer to the documentation that came with your system.