Motorola SURFboard SB6121 - Cable modem - 195 Mbps (4 channels) - GigEYour customers want high-bandwidth data and multimedia services. The easy-to-use SB6121 SURFboard eXtreme cable modem helps you deliver. Harnessing the power of DOCSIS 3.0, the SB6121 enables channel bonding of up to four downstream channels and four upstream channels - so you can offer your customers advanced multimedia services. Strengthen your broadband leadership. Count on the Motorola SB6121 to help you deliver ultra-broadband services to your premium customers.