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  • ARRIS / Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem - Retail Packaging
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ARRIS / Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem - Retail Packaging

by Arris
| 837 answered questions

List Price: $99.99
Price: $69.97 & FREE Shipping. Details
You Save: $30.02 (30%)
In Stock.
Ships from and sold by Amazon.com. Gift-wrap available.
  • Requires Cable Internet Service
  • Compatible with major U.S. cable networks
  • Internet download speeds up to 172 Mbps and upload speeds up to 131 Mbps based on your Cable provider service
  • Good for streaming Video and gaming on multiple devices at a time
  • Rear panel color coded for ease of installation
  • BROWN BOX models NOT VALID for this item, should report to Amazon immediately and RETURN to Seller
59 new from $59.99 62 used from $47.00 2 refurbished from $55.49
$69.97 & FREE Shipping. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

ARRIS / Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem - Retail Packaging + TP-LINK TL-WR841N Wireless N300 Home Router, 300Mpbs, IP QoS, WPS Button
Price for both: $89.96

Buy the selected items together


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Technical Details

  • Brand Name: Arris
  • Model: SB6121
  • Hardware Platform: PC
  • Connectivity Technology: Wired
  • Network Data Transfer Rate: 160 Megabits Per Second
  See more technical details

Product Details

  • Product Dimensions: 2 x 6.4 x 8.7 inches ; 1.3 pounds
  • Shipping Weight: 1.4 pounds (View shipping rates and policies)
  • Shipping: Currently, item can be shipped only within the U.S.
  • ASIN: B004XC6GJ0
  • Item model number: SB6121
  • Average Customer Review: 4.5 out of 5 stars  See all reviews (5,473 customer reviews)
  • Amazon Best Sellers Rank:
  • Date first available at Amazon.com: June 1, 2011

Product Description

Product Description

A new and improved version of the world's most widely deployed DOCSIS cable modems. For the residential cable subscriber who wants a powerful modem capable of delivering a high-speed data service at blazing fast speeds.10 / 100 / 1000 Base-T Ethernet Port (RJ-45) and 1-Year Limited Warranty.

Additional information:

• Requires CABLE Internet Service, if not sure your provider is CABLE call them to confirm
• Compatible with ALL Major CABLE providers like Comcast, Cox, Charter, Time Warner, Mediacom, Bright House

From the Manufacturer

Building upon the success of the SB6120, Motorola's SURFboard 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, downloading, working, high-quality voice and video conferencing, and peer-to-peer networking applications far more realistic, faster, and efficient than ever before.

SB6121 front

Key Features

Easy to Set Up and Use
  • Plug and play installation
  • Front panel LEDs indicate status and simplify troubleshooting
  • Multi-language user guides
  • Supports standard internet software
  • User-friendly online diagnostics
Efficient
  • Stylish and space-saving enclosure
  • Offers innovative, high-bandwidth data and multimedia services to customers
  • Backward-compatible to DOCSIS/EuroDOCSIS 1.x and 2.0
Advanced Services Ready
  • DOCSIS 3.0-certified (EuroDOCSIS 3.0-based)
  • Channel bonding of up to 4 downstream and 4 upstream channels
  • 1 GHz capable tuners
  • Supports IPv4 and IPv6 to expand network addressing capabilities
Versatile and Convenient
  • Compatible with Windows, Macintosh, and UNIX computers.
  • Gigabit Ethernet (RJ-45) data port enable flexible, high-speed connectivity with Auto Negotiate and Auto MDIX
Reliable and Secure
  • Enhanced security: supports Advanced Encryption Services (AES) traffic encryption
  • Remotely configurable and monitorable using SNMP and TFTP
Installation
Easy to install, activate, and use.

As part of Motorola's DOCSIS 3.0 Ultra-Broadband family of products, the SB6121 includes an enhanced tuner that supports up to a 1 GHz downstream input, which allows operators to increase the frequency spectrum for deployment of new high-value services--such as bandwidth on-demand, commercial services, interactive gaming, and IPTV. The SB6121 features a 10/100/1000Base-T Ethernet (RJ-45) port, as well as intuitive, easy-to-read front-panel operational status LEDs.

What's in the Box

Motorola SURFboard SB6121, Ethernet cable, installation sheet

System Requirements

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

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 Motorola SURFboard SB6121's 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.


Customer Questions & Answers

Customer Reviews

Easy to install, works great so far.
John R.
Hopefully, this will make it easier for anyone else like me who is also looking to cut down on fees and buy a really good modem.
A Christy
It will eventually save me money by avoiding a paying a modem rental fee to Comcast every month to boot.
P. Winders

Most Helpful Customer Reviews

1,980 of 2,022 people found the following review helpful By T. Hyatt on September 29, 2011
Verified Purchase
Out of nowhere, I was having excruciatingly slow internet speed on Comcast. The Comcast tech advised that my Motorola SB 4100 was at the "end of life" and that I should upgrade. Skeptical, I purchased this modem which is a DOCSIS 3.0 (and backwards compatible) modem. It worked. I went from a 2mbps download speed to over 17mbps. What a difference. There was one installation glitch that you need to be aware of. When you hook up the modem (connect the coax cable, connect the ethernet cable, and plug it in, that's it), and then try to get online, it will direct you to a Comcast self-activation screen (no other site is available). After entering my account number and phone number and hitting the "next" button, I got a blank screen, and nothing happens. So I called Comcast and they said that usually happens if you are doing an upgrade; it mostly works only for a new service connection. However, it is a simple matter to give the tech your MAC address and the serial number. After about 5 minutes, while he stayed on the line, it came alive, no problem. BUT, here's the thing: the serial number they need is the CUSTOMER serial number. This is only found on the bottom of the Motorola box the modem came in. This is different from the "S/N" serial number that is on the label that is on the instruction sheet and on the bottom of the modem itself. The customer S/N has letters in it; the regular S/N has only numbers in it and is too long. My first Comcast tech didn't know that and it took a day to sort it out. Other than that, it works well with my iMac and Apple Airport Extreme Base wireless router. Enjoy
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1,264 of 1,321 people found the following review helpful By Kendoso on February 4, 2012
Verified Purchase
I felt compelled to write this to help those who will encounter the problems I faced (and mentioned here). I'm one of the many people who wanted to avoid renting a modem from Comcast and bought this modem based on the stellar reviews, only to find that on the day of installation/activation that it "didn't work". Didn't work meant experiencing the same symptoms that's been mentioned here several times - "modem connects but then resets/power cycles/disconnects itself within a few minutes." This happened to me on the day I activated my Comcast internet. The technician spent 1.5 hours trying to figure it out and ended up loaning me a Comcast modem (Motorola SB5120 DOCSIS2), which came up almost instantly and activated just as fast (go figure). He suggested I return this modem as it was defective, in his opinion. I didn't like this since the probability of this was very small. But I saw what I saw and could not get past the first page of Comcast self activation screen with this modem. Before the web page for self activation could proceed, after typing my account info and phone number, the modem would conveniently lose connection. At one point I did get to the next screen where it was scanning for devices, but the modem cut out thereby hanging the process. The modem was packed up in the box for return to Amazon when I couldn't shake how much this bothered me and by my bad luck. So I came back here and read pretty much every review. What I found was there's several people who experienced the EXACT same symptoms while trying several of the same modem. There were two reviews that stood out. One was from a person who mentioned the Comcast technician moaned when he saw it was this modem, indicating that the technician was aware of difficulties using this modem.Read more ›
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227 of 239 people found the following review helpful By Cary L. Brown on March 17, 2012
Verified Purchase
... It seems that various ISPs are breaking FCC regulations and Federal Law by refusing to activate some newer modems, in an attempt to force users to use a "leased" modem.

There is an essentially IDENTICAL version of this device, the SB6141, which is the "ISP leased" version of this. You can't buy that, at least not "officially," mind you.

(EDIT - since I originally wrote this, it does seem that it's become possible to buy the "cable operator only" SB6141 directly...)

Time Warner Cable has just had me on the "loop" for the past two and a half hours, and I'm still on hold as I write this. They're telling me that the device isn't on the "approved list" and thus cannot be activated on their system. This, of course, is PATENT NONSENSE. All they require in order to access any device is (a) a device which speaks the same electronic "language" (in this case, DOCSIS 3.0, which TWC Austin supports fully, and brags about supporting fully), and (b) a valid, unique HFC MAC ID code.

The MAC ID is what allows the two devices (the ISP's "source" modem and your modem) to talk to each other, as the ISP needs to know that the ID it's talking to is an ID which it's supposed to talk to, and they need to speak the same language. THAT IS ALL THAT IS REQUIRED ON ANY TECHNICAL BASIS WHATSOEVER.

It is a violation of Federal Law and FCC regulations for an ISP to refuse to service any device which has a valid, unique, and "not stolen" MAC ID and which uses an approved communications protocol.

Those of you who have been told "Comcast won't support this" or, as I just was, "Time Warner won't support this," please realize, YOU ARE BEING ROBBED, every bit as much as if they put a gun to your head and told you to hand over your wallet.
Read more ›
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