Quote:
Connecting for 100-Mbps Fast Ethernet
Category 5 UTP cable is required for Fast Ethernet
operation. The maximum cable run between the DFE-
530TX and the supporting hub is 100m. The cable must be
straight (not a crossover cable), with an RJ-45 plug at each
end. Make the network connection by plugging one end of
the cable into the RJ-45 jack of the DFE-530TX, and the
other end into a port of the supporting hub.
As you can see, it clearly states that you need a straight cable and not a crossover cable for 100 Mbps operation.