Arris TM722G Telephony Cable Modem - DOCSIS 3.0 Compatible with Comcast Internet & Phone Service (and Major US Cable Providers) Download speeds up to 343 Mbps Flexible 4x4 upstream / downstream channel-bonding with superior throughput Meets DOCSIS 3.0 specifications as well as backward compatibility with existing DOCSIS 2.0, 1.1 and 1.0 networksr-supplied Ethernet hubs) Unlimited local and nationwide long distance calling