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Cablecom told me to run on 10Mb/half-duplex. The strange thing is, when i run it on Auto i get the popup that the the pc is connected with 100Mb. Dont know why i should run on 10Mb!
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I could be wrong, but AFAIK a cable-company's coaxial cable is a shared medium, just a single straight piece of wire, with repeaters along the way every 100m or so. Only one station can transmit onto the wire at a time, if anybody else tries, everybody will see a collision, and will have to back off, wait a random amount of time, and try again. This is basic
CSMA/CD (Carrier Sense Multiple Access/Collision Detect) technology.
This is is inherently a half-duplex arrangement: meaning you can't transmit and receive at the same time. That's probably why the cable company told you that. Although running full duplex into the modem may "work", it likely is actually artificial: the modem probably has to buffer what you're sending, wait for the line to clear, then send it. And it won't receive any more new data until it finishes sending.
BTW, 10Mbit/s is still probably more than what you'll ever actually get from the cable at max rate, what I's guess might be about 7Mbit. So that might be why they told you to run at 10... plus they probably either don't work at 100/half, or there's no point to trying it, if 10 is fine.
Hope this helps. And like I said, i could be wrong on some of this.
-clintfan