Lenovo ThinkPad T420si User Manual page 130

9. Pivot the card until you can snap it into place by pressing the upper side of the connectors (1), and
secure the card with the screw (2).
10. Connect the cables to the new PCI Express Mini Card. Be sure to attach the gray cable to the connector
marked "MAIN" or "M" on the card, and the black cable to the connector marked "AUX" or "A".
Note: If the new PCI Express Mini Card has three connectors, be sure to attach the gray cable to the
connector marked "TR1" on the card, and the black cable to the connector marked "TR2". If you attach
either cable to the center connector, the connection speed will be lower.
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User Guide