Lenovo ThinkPad T61 Hardware Maintenance Manual page 77

Removing and replacing a FRU
When installing: 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.
Some ThinkPad computer has three cables and the 802.11
a/b/g/n wireless LAN card. In that case, 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.
After you secure the card, make sure that the antenna cables are
routed as shown in the each figure.
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ThinkPad T61 and T61p (14.1-inch)