Cisco DPC3010 DOCSIS 3.0 8x4 Cable Modem Compatible with Time Warner Cable, Cox Communication and more! NOT COMPATIBLE WITH COMCAST Designed to meet DOCSIS 3.0 specifications as well as backward compatibility with existing DOCSIS 2.0, 1.1 and 1.0 networks. 10/100/1000 Mbps Ethernet port to connect with router or computer; Form Factor: External DOCSIS 3.0 Certified with speeds capable of up to 343Mbps down and 120Mbps upstream.