IBM 10/100 Ethernet Mini-PCI Adapter User Manual page 8

The IBM 10/100 Ethernet Mini PCI Adapter with 56K
Modem by 3Com is already installed in your ThinkPad
computer. In some instances, however, you might have to
install the combination card. Before installing a
combination card, you must first tear off one of the MAC
address labels found on the combination card wrap and
attach it to the rear panel of your computer. For more
information on installing the card, refer to the
documentation that comes with your ThinkPad computer.
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IBM 10/100 Ethernet Mini-PCI Adapter with 56K Modem by 3Com User's Guide