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Technical Details
- Up to 160 Mbps downstream, up to 120 Mbps upstream
- Front panel, easy to read operational LEDs to indicate status and simplify troubleshooting
- IPV6 support - latest Internet communication protocol
- Rear panel color coded for ease of installation
Product Details
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Product Description
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.
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Key Features
Easy to Set Up and Use
Efficient
| Advanced Services Ready
Versatile and Convenient
Reliable and Secure
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 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 BoxMotorola SURFboard SB6121, Ethernet cable, installation sheet System RequirementsThe SB6121 is compatible with the following operating systems:
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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.
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.
Customer Reviews
Most Helpful Customer Reviews
467 of 477 people found the following review helpful
I have tried both the SB6120 and the 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.
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.
288 of 292 people found the following review helpful
Amazon 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
167 of 176 people found the following review helpful
Amazon Verified Purchase
Bottom line: this is a great modem and it works with Comcast. Comcast just doesn't have its act together. This modem is not only on their approved list, it has a three star rating, which, according to Comcast, is "the highest and most thorough level of testing." When the cable installer got here (I got a new line installed), he said that this modem was NOT on the Comcast list. Since I still had my DSL line working, I showed him that not only did Comcast approve the modem but that Comcast thoroughly tested it. He had to call the "office" to activate the internet service. The "office" didn't want to set up internet service for this modem; the "office" stated that this wasn't an approved modem. Well, he recalled the "office" and got someone else and they set up the service. I've been happy ever since. I'm supposed to get up to 20 Mbps download and 4 Mbps upload. My computers are connected wirelessly. Speednet states that I am getting 20 to 25 Mbps downloads and the upload speed is between 3 and 3.5 Mbps. I've gotten similar values with speakeasy and other internet speed testing sites. I have a lot of devices connected: three computers (wireless), two TVs (one wired, one wireless), three different game consoles (connected to the wired TV), two Nintendo 3DS (wireless), one printer (wireless), and an iPod Touch (wireless). At times all of these devices are running at the same time - the computers are streaming You Tube videos, one of the TVs is streaming Netflix, etc. The modem handles all of it effortlessly. I'm really pleased with this modem.
Most Recent Customer Reviews
Easy and Fast
This unit was easy to install, I just unhooked the connectors from my old modem and plugged them into this new one, called Comcast to register the unit and it was working. Read more
Published 1 day ago by Joyce
great modem
Easy to install compact ,has worked from day 1,I have it hooked up to Cable and a wireless router,used in conjunction with DVD for streaming
Published 1 day ago by J. Manriquez
Great Modem For COMCAST
I bought this modem to use with comcast. YOU CANNOT ACTIVATE THE MODEM THROUGH THE ACTIVATION SCREEN THAT POPS UP, YOU MUST CALL COMCAST YOURSELF. Read more
Published 1 day ago by John
Great Modem
I replaced an old Linksys modem with this modem and have nothing but good words to say about it. Works great!
Published 2 days ago by R. Hayner
Motorola DSL wireless Router
Guys,
I bought this about 6 months ago and it just died. Do not waste you money and look for something else. I am going to check out a Netgear product now.
I bought this about 6 months ago and it just died. Do not waste you money and look for something else. I am going to check out a Netgear product now.
Published 3 days ago by R. Baghaie
Installing the Motorola SB6121 Cable Modem
I installed my new Motorola SB6121 Cable Modem today. The cable connection and bootup of the modem completed without a hitch and I contacted Xfinity Cable (Comcast) and spoke with... Read more
Published 3 days ago by Clarence J. Welsh
DOCSIS 3.0 - awesome modem
Works as advertised, very simple set up. Plug and play. Just call your provider to authorize modem.
DOCSIS 3.0 upgrade works great. Read more
DOCSIS 3.0 upgrade works great. Read more
Published 3 days ago by ryantlinder6
Could not be better
The Motorola SB121 cable modem works well with no problems. It was easy to install. I am very happy with my purchase.
Published 3 days ago by Santa Ray
Just works
This is the second one that I've purchased. The first was fried by lightening. I don't have a lot to say about it because I plugged it in, configured it, called Comcast to enable... Read more
Published 4 days ago by backdoc
Motorola SB6121 works great
This Motorola Modem works great not only does it outperform the cheaper D3 modems that Comcast is now shipping it also seems to run a bit cooler and further it has a working web... Read more
Published 5 days ago by Benjamin Kerensa
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