We're running DOCSIS 3 on 8 channels, there was no real problem with the upgrade. Noise in the system is still your biggest problem, but DOCSIS 3 is designed to overcome the noise to a certain extent. You don't want to be using taps over 23 value as the levels start to give you problems on the higher value taps.
Never argue with an idiot, they will drag you down to their level and beat you with experience. Winston Churchill
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