The NETGEAR CM500 High-Speed Cable Modem provides connection to high-speed Internet, of 680Mbps. It is certified with DOCSIS 3.0 which is 16X faster than 2.0 devices. It works with U.S. cable Internet provider Comcast XFINITY & more. It is not compatible along with cable bundled voice services. The NETGEAR CM500 High-Speed Cable Modem provides 16 downstream & 4 upstream channels. It's Cable Labs DOCSIS 3.0 Certified to work with cable Internet providers XFINITY from Comcast, Spectrum, Cox, Cablevision and more. Net gear’s 16 x 4 modem enjoys wide compatibility with internet service providers, and its design makes setup a breeze. Approximately to 7.3 inches, the CM500 is a little taller than the SB6183..The Net gear CM500 is an inexpensive modem that performed just as well as more expensive products we founded for internet speeds up to 300 Mbps. If your internet subscription advertises speeds up to 300 Mbps or less, the Net gear CM500 is a great cable modem that performs as well as other, more expensive products we tested.