The CM1000 Ultra-High Speed Cable Modem, with speeds up to 6 Gbps and DOCSIS 3.1 is 10X faster than DOCSIS 3.0 devices. It's backward compatible with DOCSIS 3.0 and ready for future service plan upgrades. A Gigabit Ethernet port provides faster access and downloads. Plus, there are no monthly rental fees. Compatible with Xfiniy by Comcast. Not compatible with Time Warner Cable or Charter service plans.