New in 2017, this ultra fast DOCSIS 3.1 cable modem also includes 32x8 DOCSIS 3.0. Your best choice for the highest speeds with any cable modem service, even the fastest. Downloads up to 46 times faster than DOCSIS 2.0. Includes bonded Gigabit Ethernet ports for speeds over 1 Gigabit per second when supported by your service and router. A Broadcom modem chipset provides security from Denial of Service attacks. Requires cable Internet service. Certified by Comcast XFINITY for all residential speeds, including Extreme 300 and Gig-speed, and Comcast Business for all cable modem speeds including Deluxe 250. Certified by Cox Communications for all speeds, including Gigablast. Typically saves $120 per year in cable modem rental fees. Actual savings depends on your cable service provider. (MB8600 does NOT include a router and does NOT have a phone jack for Telephone Service option from Cable Companies.) Four 10/100/1000 Gigabit Ethernet (GigE) ports allow connection of any SINGLE device with an Ethernet port including a router, Windows or Mac computer, HDTV, or game station. The multiple Ethernet ports are NOT for connecting multiple devices; they allow connection to a router that can bond more than one Ethernet port to achieve speeds over 1 Gbps when supported by your cable service. Supports IPv4 and IPv6. Includes Broadcom full-band capture digital tuner to enhance speed and save energy.