In Part 1 of this series, we covered DOCSIS 2.0. Now, DOCSIS 2.0 is no slouch, but with the hot breath of fiber-to-the-home, WiMax, and LTE on its neck, it was clear to cable providers early on that DOCSIS needed to up its speed. DOCSIS 2.0 was able to improve upload speeds over DOCSIS 1.0 using denser QAM constellations and CDMA, but unfortunately, there’s a limit to simply cramming even more bits into a single QAM symbol. The problem is noise.
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