Motorola SURFboard SB6120 Cable Modem P/N 545100-009-00 DOCSIS 3.0 Excellent condition. Works perfectly. Used in a smoke-free, pet-free home. Power supply included. I replaced mine with a DOC SIS3.1 100% Comcast Compatible. You just need to call Comcast and tell them the MAC address and they will add it to your account. Product Description Motorola's easy-to-use SB6120 SURFboard eXtreme Cable Modem unlocks the potential of offering innovative high-bandwidth data and multimedia services to customers. Utilizing the power of DOCSIS 3.0, the SB6120 enables channel bonding of up to 4 downstream channels and 4 upstreamchannels - which allows an operator to offer their customers advanced multimedia services with data rates of well over 100 Mbps in each direction. It supports IPv4 and IPv6, Advanced EncryptionServices (AES), and all other DOCSIS 3.0 standards. Designed to provide a cost-effective, next-generation technology to offer a high speed residential or commercial service tier. User-friendly online diagnostics and bonded channel status page Features a 10/100/1000Base-T Gigabit Port for incredible wired network speeds Up to 4 times faster than DOCSIS 2.0 broadband Intuitive, easy to read front panel operational status LEDs