Lenovo ThinkPad R61 Hardware Maintenance Manual page 75

When installing:
In models with 802.11 a/b/g wireless LAN card, plug the gray cable into the jack
labeled MAIN on the card, and the black cable into the jack labeled AUX.
If the computer you are servicing has three cables and the 802.11 a/b/g wireless
LAN card, put the white cable in the cable bag in the card slot.
In models with 802.11 a/b/g/n wireless LAN card, plug the gray cable (MAIN)
into the jack labeled TR1, the white cable (3rd) into jack labeled R0, and the black
cable (AUX) into jack labeled TR2 on the card.
Removing and replacing a FRU
ThinkPad R61 (15.4-inch widescreen)
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