Coaxial to RJ-45 converters are available from many sources: Red Orbit, Computers All Services, Eagle Computer...
and Deal Time for example.
Any standard HUB or switch with an uplink port will allow you to split out a single CAT5 or CAT6 cable to multiple RJ-45 outputs. If you already have a HUB or switch, but it doesn't have an uplink port, use a crossover cable to connect it to your original RJ-45 port.
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