Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem

Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem

If lightning-fast broadband speed is what you’re after, Motorola’s SURFboard SB6121 delivers what your heart desires. It employs the power of the DOCSIS 3.0 technology to bond up to four downstream channels and four upstream channels.

This modem provides you with the ultimate Internet surfing experience with data rates of more than 100Mbps in each direction. It takes gaming, shopping, downloading, working, high-quality voice and video conferencing, and peer-to-peer networking applications to a whole new level.

What is the Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem?

Motorola’s SURFboard SB6121 delivers a complete personal media experience, at lightning-fast broadband speed like you’ve never seen before. With the DOCSIS 3.0 specification, cable Internet providers can take advantage of the extra capacity provided by channel-bonding technology in order to offer ultra-fast broadband services. Channel bonding allows parallel data pipes to act as a single broadband conduit. Each channel can provide about 40 Mbps of data. This means the Motorola SURFboard SB6121’s four downstream channels can provide up to 160 Mbps of throughput.


Cable providers max out at around 50 Mbps of downstream data throughput. The Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem allowscable Internet providers to continue to improve the speed of their networks. This is great news to the residential cable subscriber who wants a powerful modem capable of delivering a high-speed data service at incredibly fast speeds.

Notable Features

The features the Motorola SURFboard DOCSIS 3.0 cable modem provides mean it not only provides a great Internet experience, it also is simple to use.

  • Easy to Set Up and Use: With a simple plug and play installation, set up is a breeze. If there is a problem, front panel LEDs indicate status and simplify troubleshooting, as well as user-friendly online diagnostics. There are multi-language user guides. No complicated software is required as it supports standard internet software.
  • Efficient: It offers innovative, high-bandwidth data and multimedia services to customers. It has Backward-compatible to DOCSIS/EuroDOCSIS 1.x and 2.0. Gone are unsightly modems as this has a stylish and space-saving enclosure.


  • Advanced Services Ready: This is DOCSIS 3.0-certified (EuroDOCSIS 3.0-based). It is channel bonding of up to 4 downstream and 4 upstream channels, as well as 1 GHz capable tuners. It supports IPv4 and IPv6 to expand network addressing capabilities.


  • Versatile and Convenient: It is compatible with Windows, Macintosh, and UNIX computers. The Gigabit Ethernet (RJ-45) data port enables flexible, high-speed connectivity with Auto Negotiate and Auto MDIX.


  • Reliable and Secure: The enhanced security supports Advanced Encryption Services (AES) traffic encryption. It is remotely configurable and monitorable using SNMP and TFTP.


Some people who purchased this modem reported it did not live up to their high speed expectations.  Some say it disconnects without warning. This is certainly a crime with any modem. A number of people reported it did not work with Comcast.

Should You Buy a Motorola SURFboard Cable Modem?

If Internet speed is important to you, the Motorola SURFboard Cable Modem is a great purchase. Overall, it is highly rated and does a great job of providing superior Internet speed. It increases online speed three times to what standard Internet providers can offer. If you spend much time online or rely on any of your livelihood online, this purchase is a must have.


Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem