Allied Telesis NETEXTREME II AT-2973SX - Manual (Page 35)

AT-2973SX, AT-2973T, and AT-2973T/4 NetExtreme II Family Adapters Installation and User’s Guide
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Figure 9. 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 10.
Figure 10. 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.