If you are looking for a modem high quality at affordable prices, sb6121 is a modem that you are looking for.because  SB6121 delivers your complete personal media experience, at lightning-fast broadband speed. It harnesses the power of DOCSIS 3.0 technology to bond up to four downstream channels and four upstream channels providing you advanced multimedia services with data rates of more than 100 Mbps in each direction. That makes gaming, shopping,working,downloading,video conferencing and high-quality voice, and peer-to-peer networking applications far more faster, realistic, and efficient than ever before.

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Easy to install, activate, and use.

SB6121 Key Features

Reliable and Secure
Remotely configurable and monitorable using SNMP and TFTP
Enhanced security: supports Advanced Encryption Services (AES) traffic encryption
Efficient
Stylish and space-saving enclosure
Backward-compatible to DOCSIS/EuroDOCSIS 1.x and 2.0
Offers innovative, high-bandwidth data and multimedia services to customers
Advanced Services Ready
Channel bonding of up to 4 downstream and 4 upstream channels
Supports IPv4 and IPv6 to expand network addressing capabilities
DOCSIS 3.0-certified (EuroDOCSIS 3.0-based)
1 GHz capable tuners
Easy to Set Up and Use
Multi-language user guides
Supports standard internet software
User-friendly online diagnostics
Plug and play installation
Front panel LEDs indicate status and simplify troubleshooting
Advanced Services Ready
Channel bonding of up to 4 downstream and 4 upstream channels
Supports IPv4 and IPv6 to expand network addressing capabilities
DOCSIS 3.0-certified (EuroDOCSIS 3.0-based)
1 GHz capable tuners

Motorola SB6121 System Requirements

The SB6121 is compatible with the following operating systems:
Windows Vista, Service Pack 1 or later
Windows 7
Windows XP, Service Pack 2 or later
UNIX (Ethernet connection only)
Linux (Ethernet connection only)
Mac 10.4 or later (Ethernet connection only)

What Is DOCSIS 3.0?

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. With each channel capable of providing around 40 Mbps of data, the SB6121 four downstream channels can provide a theoretical maximum of 160 Mbps of throughput.
Currently, cable providers max out at around 50 Mbps of downstream data throughput, but DOCSIS 3.0 will enable cable Internet providers to continue to improve the speed of their networks.

SB6121 Surfboard What’s in the Box
Motorola SURFboard SB6121
Ethernet cable
installation sheet

SB6121 Customer Review

By Ayame (Denver, CO) Stay with the SB6120, July 8, 2011

I have tried both the SB6120 and the Surfboard SB6121 and the signal levels and speeds were the same on both.

The SB6121 is a little smaller than the SB6120 but runs much warmer than the SB6120. Looks like they tried to cram too much hardware into too small of a space.

My SB6121 did not come with the power save button (it’s listed as an optional feature), so about the only difference between the two models is the design. Both the SB6120 and the SB6121 use the same firmware: labeled SB612X.

So unless you want the different looking LED lights and a smaller and warmer box for a higher price, stay with the SB6120.

As far as speeds are concerned: the multiple channel bonding on these DOCSIS 3.0 modems is nice for sustained constant speeds. It also makes it easier for your ISP to enforce the speed cap if they choose to do so (Comcast in my case does). I was getting 20+ Mbps down and 3+ Mbps up on my old Linksys DOCSIS 2.0 modem, however that was the peak when the transfer first started, then it would taper off. The DOCSIS 3.0 modem stays right at the 12/2 ceiling of my speed tier, but at least the speeds stay right up there and do not drop off after a few seconds.

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