I order this modem instead of the sb6120 because of the problem report in connect to COMCAST . unfortunately this modem do not connect to COMCAST . Motorolla inform I that the isp must download a file specific to the give modem . since this be not yet on the list of approve modem . there be no file and it can not connect , although they do tell I the signal be excellent . HENCE : do not order this modem for use with COMCAST unless they tell you it be compatible ...