Dell D31M Owner's Manual page 66

Steps
1. Connect the antenna cables to the wireless card.
The following table provides the antenna-cable color scheme for the wireless card of your computer.
Table 29. Antenna-cable color scheme
Connectors on the wireless card
Main (white triangle)
Auxiliary (black triangle)
2. Place the wireless card bracket to secure the wireless antenna cables.
3. Insert the wireless card into the connector on the system board.
4. Replace the (M2x3.5) screw to secure the plastic tab to the wireless card.
Next steps
1. Install the side cover.
2. Follow the procedure in
66 Removing and installing Customer Replaceable Units (CRUs)
after working inside your
Antenna-cable color
White
Black
computer.