I beleive charter is Docsis 3, and you are gunna want atleast a D3 modem i recommend the 6120 as a stand alone unit it performed amazing and then dont get a fly by night router, with all the extensive testing i did for the isp i work for the dlink out performed all, un fortunitly i can not post actual test results but the 615 and the duel band 825 rocked the charts for threwput. But again i recommend and stand behind my recommendations of the cisco piece. If you need further info i would be willing to share off forum.
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