3Com 10/100BASE-T4 User Manual page 20

100BASE-T4 connections use all 4 pairs of wire normally
contained in a bundle of Category 3, 4, or 5 UTP cable. The
"straight through" connection should be made from the Fast
EtherLink PCI adapter through the cable and connectors to
the hub. No crossover in the cable is required.
Refer to Appendix A for RJ-45 connector pin assignments.
2 Align the RJ-45 connector on the end of the twisted-pair
cable with the notch on the adapter's connector and
insert it into the adapter connector.
3 For 100 Mbps operation, be sure the connection is to a
100BASE-T4 hub port.
4 The next step is to install network drivers, as explained in
Chapter 3.
Connecting to the Network 2-5