Comcast be my inet provider and they send I a letter state that my modem be too slow to get the full benefit of xfinity speed and that I need to get a new modem . I call and be able to figure out that my modem be a DOCSIS 1.0 cable modem and that I need to get the newest available , DOCSIS 3.0 . I find this modem online and compare the price on Amazon , better price and very good review so I buy it . good product , great price !