this product work out of the box as be be suppose to . I be on Charter and most of the problem it appear come from Comcast customer . I choose this item by ask the tech repair personnel which modem they be use . this be the second time I have use this method to decide what equipment to buy and figure there system accept that model better . call and register the MAC which Motorola would do good to distinguish b from 8 better it take several time on those type of issue once register work fine .