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I'm not certain if the following works for 3Com switches, but I know that cisco switches can be configured with port security. Any port accepts an x amount of mac addresses and you can control how many e.g 1 mac address. Then you can also define what to do if a different mac is detected (e.g. shut down the specific port and become active if the right mac address is present).
The following link is to the cisco site explaining port security and how to enable it: