Arris TM602 Telephony Modem (Not supported by Comcast) Please check with your Internet Service Provider before buying, as not everybody supports this model. Optional backup battery Sold Separately The TM602 delivers two lines of carrier-grade Voice over IP (VoIP) and High-Speed Data access. Benefits: DOCSIS 2.0 and PacketCableTM 1.1/1.5 compliant design High Speed Internet via 10/100 Base-T Ethernet (RJ-45) or USB1.1 port Improved Line Card Performance over the industry leading TM502 - Greater than 20% increase in high loop current mode and 10% greater ringing voltage More Battery Options The TM602 maintains the same modem and battery form factors, but introduces two new battery options.