Lenovo ThinkPad R51e Series Hardware Maintenance Manual page 107

Removing and replacing a FRU
When installing: Plug in the wireless antenna cable as
follows:
Intel PRO/Wireless LAN 2100 3B Mini PCI Adapter or
Intel PRO Wireless 2200BG Mini-PCI Adapter
In case of the antenna jacks have the tabs, plug the gray
antenna cable with the tab marked MAIN into jack M, and
the black antenna cable with the tab marked AUX into jack
A.
In case of the antenna jacks do not have the tabs, plug the
gray cable to jack M, and the black cable to jack A.
Aux.
Main
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ThinkPad R50e, R51e and R52 Series