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Technical Details
- SB6121 is DOCSIS 3.0 certified & backward-compatible to DOCSIS 1.0/2.0. Plug & Play
- SB-6121 is 100% New from Motorola and complete with power adapter and Cat5 cable
- SB6121 is compatible with Windows, Macintosh, and UNIX computers makes the SB6121 a great choice.
- Enhanced security: supports Advanced Encryption Services (AES) traffic encryption
- SB6121 offers innovative, high-bandwidth data and multimedia services to customers
Product Details
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Product Description
Utilizing the power of DOCSIS 3.0, the SB6121 enables channel bonding of up to four downstream channels and four upstream channels, which allows
an operator to offer their customers advanced multimedia services with data rates of well over 100 Mbps in each direction.
The Motorola SB6121 is backwards compatible to DOCSIS 1.0, 1.1 and 2.0. The SB-6121 also supports both IPv4 and IPv6, Advanced Encryption Services, and all other DOCSIS 3.0 standards. The Motorola SB6121 features a 10/100/1000Base-T Ethernet (RJ-45) port, as well as intuitive, easy-to-read front-panel operational status LEDs.
With Motorola's cable modems, high-speed Internet access is always at your fingertips - always on and always connected. The SB6121 is the ideal competitive solution for the high-end residential user, the small home office owner, and the medium to large business enterprise.
The SB6121 is a data-only modem and does not support telephony services. The SB6121 is not a wireless modem, but can be connected to an external wireless router.
The Motorola SB6121 is backwards compatible to DOCSIS 1.0, 1.1 and 2.0. The SB-6121 also supports both IPv4 and IPv6, Advanced Encryption Services, and all other DOCSIS 3.0 standards. The Motorola SB6121 features a 10/100/1000Base-T Ethernet (RJ-45) port, as well as intuitive, easy-to-read front-panel operational status LEDs.
With Motorola's cable modems, high-speed Internet access is always at your fingertips - always on and always connected. The SB6121 is the ideal competitive solution for the high-end residential user, the small home office owner, and the medium to large business enterprise.
The SB6121 is a data-only modem and does not support telephony services. The SB6121 is not a wireless modem, but can be connected to an external wireless router.
Customer Reviews
Most Helpful Customer Reviews
91 of 92 people found the following review helpful
Amazon Verified Purchase
Motorola's SB6121 cable modem is one of the best cable modems available on the market right now, if not THE best. It is a full DOCSIS-3.0 modem, but also fully backwards compatible with DOCSIS 2.0 and all the way back to DOCSIS 1.0. In short, it should work on any cable system. It is future-ready with IPv6 support built in.
I bought the SB6121 to replace a D-Link DCM202 which had started randomly dropping the connection several times a week, sometimes multiple times a day. Installation is trouble-free; just connect the cables and notify your cable company. (Have the MAC address from the label on the bottom of the modem handy when you call.) Many cable users report speed gains on updating to a DOCSIS 3.0 modem; I'm no exception -- my download speed went from 11.5Mbps to 12.8Mbps, and my upload speed increased by 50% from 960Kbps to 1.5Mbps.
Interface-wise, there's not a lot to say. The Motorola SB6121's colored graphical-icon LED indicators are much easier to identify and read from a distance than the D-Link's closely spaced row of identical yellow-green LEDs. You can look at it from across the room and see two steady blues and one blinking amber, and know at a glance you're in good shape.
This is perhaps a more expensive modem than some, but it's worth it, and you can't fault Motorola's reputation. It also carries a better warranty than many other cable modems. Do yourself a favor and buy this OEM-packaged version; the shinier box on the retail version won't make your cable connection any faster. (But the chances are good that this modem will.)
I bought the SB6121 to replace a D-Link DCM202 which had started randomly dropping the connection several times a week, sometimes multiple times a day. Installation is trouble-free; just connect the cables and notify your cable company. (Have the MAC address from the label on the bottom of the modem handy when you call.) Many cable users report speed gains on updating to a DOCSIS 3.0 modem; I'm no exception -- my download speed went from 11.5Mbps to 12.8Mbps, and my upload speed increased by 50% from 960Kbps to 1.5Mbps.
Interface-wise, there's not a lot to say. The Motorola SB6121's colored graphical-icon LED indicators are much easier to identify and read from a distance than the D-Link's closely spaced row of identical yellow-green LEDs. You can look at it from across the room and see two steady blues and one blinking amber, and know at a glance you're in good shape.
This is perhaps a more expensive modem than some, but it's worth it, and you can't fault Motorola's reputation. It also carries a better warranty than many other cable modems. Do yourself a favor and buy this OEM-packaged version; the shinier box on the retail version won't make your cable connection any faster. (But the chances are good that this modem will.)
55 of 56 people found the following review helpful
By Nikesh
Amazon Verified Purchase
I was wary to buy this modem from this seller because it had no reviews and it wouldn't come in retail packaging. After convincing myself that it was the same one as listed elsewhere for more, I took the plunge and have been very happy with the modem. The installation for this modem, as with all cable modems, is exceedingly easy. The sales rep at Comcast that I spoke to said that they could only guarantee me 12 Mbps service on my plan, but that I was allowed up to 20 Mbps. She said this was because I am in a high rise and that there are many tenants also using the same cable feed for Internet. I am happy to say that with this Docsis 3.0 modem, I am bonding 4 channels and getting over 22 Mbps down and over 4 Mpbs up which is plenty for a vacation spot. I highly recommend this modem and you shouldn't hesitate to buy it here and save a couple bucks.
55 of 58 people found the following review helpful
By Whitey
Amazon Verified Purchase
I decided to buy my own modem instead of renting the lower-end model from Comcast for $7/month. This has DOCSIS 3.0, so it supports higher speeds than the DOCSIS 2.0 Comcast rented me. My speeds increased from 18Mbps to 24Mbps by just installing the new modem. I just called Comcast, gave them the model # and serial/MAC, and they set it up over the phone. The seller shipped the item very quickly too!
55 of 59 people found the following review helpful
Amazon Verified Purchase
After 2 days of use with Comcast, my new Motorola suddenly stopped connecting to the Internet. After some time on the phone with Comcast tech support, we found that the modem was actually registered on multiple accounts, meaning that the "new official manufacturer brown box" covers up for the fact that the seller sells used merchandise which, at least in my case, is not carefully reset before resale. I thought it came from Amazon but it's actually a 3rd party.
Buyer beware. Great modem, bad seller.
Buyer beware. Great modem, bad seller.
12 of 12 people found the following review helpful
By Musicfan
Amazon Verified Purchase
I am using the SB6121 cable modem with Comcast cable. Setup was fast and easy. Plugged in the box in place of the old one, and called Comcast. The service representative knew what he was doing. It took about 20 min from when I called to everything working properly (including hold time). Make sure to have the MAC address handy when you call. For this packaging, the MAC is on the sticker on the bottom of the unit, as well as inside the cardboard packaging on the stickers on a paper strip.
The indicators on the box are great. The receive and transmit indicators are bright blue if it detects a docsis 3.0 connection, green if it detects a docsis 2.0 connection. These receive, transmit, and online indicators are steady if connected properly. Very easy to know the status at a glance from across the room. A note: On initial powerup (before calling Comcast), the receive / transmit light settled on green, and that had me wondering what was going on. It turns out that Comcast had to get the correct profile downloaded on the box, and the right configuration setup at their end before the indicators are meaningful.
The indicators on the box are great. The receive and transmit indicators are bright blue if it detects a docsis 3.0 connection, green if it detects a docsis 2.0 connection. These receive, transmit, and online indicators are steady if connected properly. Very easy to know the status at a glance from across the room. A note: On initial powerup (before calling Comcast), the receive / transmit light settled on green, and that had me wondering what was going on. It turns out that Comcast had to get the correct profile downloaded on the box, and the right configuration setup at their end before the indicators are meaningful.
9 of 9 people found the following review helpful
By John
Amazon Verified Purchase
Costs about the same as the older DOCSIS 2.0 modems but decided to try it anyway even thought it wasn't on the approved list for TWC (Raleigh). Received the modem, disconnected my old, old SB5100, called TWC and gave them the MAC address and a few minutes later it was working. Didn't notice much speed increase but have a DOCSIS 3.0 modem for future speed increases and features. Recommend this modem for TWC if you don't want to pay the new modem rental fee.
6 of 6 people found the following review helpful
By L.G. Baines
Amazon Verified Purchase
I began to suspect that something was wrong with my network gear when my Skype calls kept failing. I checked my internet download/upload speeds and found them at only 8mbps. With a bit of Googling, I realized that the cable modem I was renting (for $7.50 a month) from Comcast was nine years old.
This modem was very high on the list of Comcast-approved modems and the online reviews were very good.
I ordered the modem (great price;) got it in a couple of days(great service,)plugged it in (simple as can be,) and called Comcast to let them know to update their settings to the new modem and BAM -- 35mbps download speed. This is a very, VERY good modem.
This modem was very high on the list of Comcast-approved modems and the online reviews were very good.
I ordered the modem (great price;) got it in a couple of days(great service,)plugged it in (simple as can be,) and called Comcast to let them know to update their settings to the new modem and BAM -- 35mbps download speed. This is a very, VERY good modem.
Most Recent Customer Reviews
5.0 out of 5 stars
Item received in great condition!
I saved a lot of money buying through amazon, and the item works as perfectly as a new one. No problems and no resetting the modem ever needed since we started using it. Read more
Published 7 hours ago by jherzer
5.0 out of 5 stars
Sb6121
who cares that it is not retail packaging, it was $10 less than at Walmart, and that's an unbelievable deal.
Comes with everything and is brand new. Read more
Comes with everything and is brand new. Read more
Published 1 day ago by Sara
4.0 out of 5 stars
Comcast
Works like a charm. Comcast recently updated it's service in our area. This modem will last us years. Read more
Published 1 day ago by Michael Hensel
5.0 out of 5 stars
Tired of Paying Rent for your Cable Company Modem?
The Motorola Surfboard is a cost effective alternative to paying the cable company rent (mine was $7 per month). Fast, compact and easy to set up, the Surfboard is a great. Read more
Published 2 days ago by James A. Condon
1.0 out of 5 stars
Not new/unable to register
Do not buy from Zumbee. Yes, some of the modems may be new, but there's a chance that you'll get a refurbished model that yuu won't be able to register since the serial number and... Read more
Published 2 days ago by David Baylor
5.0 out of 5 stars
Awesome
The best in the market at this price, i must say.
Have been using it for about 6 months now and there is no problem at all.
Data is fast and supports 3.0
Have been using it for about 6 months now and there is no problem at all.
Data is fast and supports 3.0
Published 2 days ago by Ruchik Samir Dave
5.0 out of 5 stars
Saves me Rent
I don't have to rent a modem now from my ISP... always good to save money. Plus... I can take it with me when I leave.
Published 2 days ago by Pen Name
5.0 out of 5 stars
Works Great
Needed a cable modem to replace the existing TW unit that was going to be "rented" to us in the future. This was the replacement CM. Read more
Published 2 days ago by wltiv
5.0 out of 5 stars
Quality Product
Setting this modem up was a breeze. I picked it up to replace a rental, and I was not disappointed with the results. Read more
Published 4 days ago by The_Stout_One
5.0 out of 5 stars
Paid for itself twice.
The Motorola Surfboard Series has always been a very reliable source of cable inet connection. This comes from one who work in the profession. Read more
Published 4 days ago by G. Lopez
