I have an intel mother board with a Pro100 network card built into the motherboard. (The machine is colocated - I will re-ask this question when I have all the version numbers, but just in case someone has the answer, I ask now)
When I plug into the switch, I get no lights on the nic, when I plug directly into the cabinet's plug, avoiding the switch, all is fine. Another system running W2K Professional has no problems with either connection.
I am running RedHat Linux 6.1