The DOCSIS 3.0 modem has been around for quite some time and its reach has spanned over both the the entry-level segment (4×4 and 8×4 downstream / upstream channels) to the higher-end side where the modems can theoretically support Gigabit tier Internet data plans (24×8 and 32×8). I know that the DOCSIS 3.1 modems have already entered the market, but, unless you have access to Gigabit speeds (and most do not) these devices don’t offer much over the high-end DOCSIS 3.0 modem, except maybe for a better behaviour if you live in an area with congested nodes (and these cable modems do come with a higher price tag).
Since there are so many DOCSIS 3.0 modems available, choosing the best cable modems is no easy feat, as there aren’t major differences between the top modems from a technical point of view and the most differentiating aspect can only be the compatibility range. Of course, the Puma 6 chipset issues are still very much relevant even today, in 2018, so I would steer clear of these devices until a proper fix will come (unfortunately, that includes all 32×8 DOCSIS 3.0 cable modems).
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