Lenovo ThinkPad X301 Hardware Maintenance Manual page 77

Table 15. Removal steps of PCI Express Mini Card for wireless LAN (continued)
When installing:
v In models with wireless LAN card that has two antenna connectors, plug the
gray cable into the jack labeled MAIN, and the black cable into the jack
labeled AUX on the card. If the computer you are servicing has three cables,
put the white cable in the cable holder.
v In models with wireless LAN card that has three antenna connectors, plug the
gray cable (MAIN) into the jack labeled TR1, the white cable (3rd) into jack
labeled R0 or TR3, and the black cable (AUX) into jack labeled TR2 on the
card.
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ThinkPad X301