this Cable Modem Works Great ! setup be a snap ! I have Comcast and just get tire of pay $ 7.00 a month rental for a old and slow modem they provide year ago . I be not a cable modem expert nor do I have the datum or tech detail to say why we entire internet download\/upload speed and overall network performance have improve dramatically except to say that change to this modem must be the answer . . the setup be very easy ! plug it in call Comcast tech support dept. . I give the tech the info he request and the modem be up and run in 10 minuet . other family member have comment that we network seem to be run faster and smother -lrb- the be unaware I make a modem change -rrb- . I also run a download\/upload speed test via Comcast 's test site and number return exceed the speed we Comcast Internet package be suppose limit out at . . bonus !!