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I thought a cable modem just converts the cable signal to Ethernet and vice versa...I don't see why having more than one would cause problems. You need a cable box for every room with a TV, why would it be different for modems?
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Yeah, it doesn't quite work that way.
Each channel that you change to has an individual frequency that it transmits on. These signals are pretty much always present, and the cable box/television just selects which signal to "decode" into visual and sonic data. This is all direct analog decoding, however, so they can all reside on the same wire.
As I understand, cable modems operate on a single, specific frequency(as assigned by the ISP), so when you try to have two different serial signals superimposed on top of each other, the resulting information is jumbled nonsense.
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Quote:
There's no telling what goes on the minds of those cable companies.
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DOCSIS - Wikipedia, the free encyclopedia 
However, it looks like DOCSIS 3.0 will make such a thing possible.
There's nowhere I can't reach.
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