Dell XPS 15 (L501X, Late 2010) - Manual (Page 24)

24 Wireless Mini-Card(s)
CAUTION: To avoid damage to the Mini-Card, never place cables under the card.
3 Insert the Mini-Card connector at a 45-degree angle into the system-board
connector.
4 Press the other end of the Mini-Card down into the slot on the system
board and replace the screw that secures the Mini-Card to the system
board.
5 Connect the appropriate antenna cables to the Mini-Card you are
installing. The following table provides the antenna cable color scheme for
the Mini-Cards supported by your computer.
6 Replace the module cover (see "Replacing the Module Cover" on page 16).
7 Replace the battery (see "Replacing the Battery" on page 14).
CAUTION: Before turning on the computer, replace all screws and ensure that no
stray screws remain inside the computer. Failure to do so may result in damage to
the computer.
8 Install the drivers and utilities for your computer, as required.
NOTE: If you are installing a communication card from a source other than Dell,
you must install the appropriate drivers and utilities.
Connectors on the Mini-Card Antenna Cable Color Scheme
WLAN (2 antenna cables)
Main WLAN (white triangle)
Auxiliary WLAN (black triangle)
white with gray stripe
black with gray stripe
WWAN (2 antenna cables)
Main WWAN (white triangle)
Auxiliary WWAN (black triangle)
white
black
TV tuner (1 antenna cable) black