Modem work as expect - I first shut down the computer , router , and modem . I then plug in the modem and it lock the signal , then plug in the router and turn on the pc . when I open the browser , I be present with the webpage to authenticate the new modem with my phone number and account with Comcast . within 10 minute I be up and run . I highly recommend this modem to anyone as Comcast be charge I $ 7\/month on my exist Arris modem . my connection with Comcast be the extreme 105 and the speedtest be identical to what I be get before -lrb- 115 mbp dl\/11 Mbps UL -rrb- .