I purchase this modem for a new apartment that I be set up the internet and cable for . it meet all of the Comcast requirement list on they site and the installation technician laud I for think ahead and have the hardware ready for he when he arrive . that be , until he try to hook it up . the modem simply refuse to connect to the Comcast network . after try a few different set up to no avail he go out to he truck and bring in a replacement modem . same brand , same model , even the same packaging . the big difference be that he work right of the bat . so long story short , I be stuck pay a monthly rental fee from Comcast and this modem in on its way back to Amazon .