Before you install your hub, you may wanna check to make sure that the wiring is actually cat5 (or at least cat3) spec. Other devices use RJ45 jacks, but wiring that isn't cat5. For general use, any wire will do, but for 10Mbps ethernet, it has to be at least cat3. Flat wire is commonly used for serial ports and won't work for ethernet.
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--The Amigo