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3-Year PC Peripherals Protection Plan

from SquareTrade
4 out of 5 stars (4595)
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2-Year PC Peripherals Protection Plan

from Asurion, LLC
4.1 out of 5 stars (1088)
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Used: Very Good | Details
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Condition: Used: Very Good
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Arris/Motorola SB6121 DOCSIS 3.0 Cable Modem in Non-Retail Packaging (Brown Box)

4.3 out of 5 stars 829 customer reviews
| 40 answered questions
Price: $99.99
Sale: $64.99 & FREE Shipping. Details
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  • 10/100/1000Mbps Ethernet port to connect with router or computer
  • DOCSIS 3.0 certified, capable of up to 172 Mbps and upload speeds up to 131 Mbps based on Cable Internet Service Provider
  • Requires Cable Internet Service. Compatible with major U.S. Cable Providers. Contact your ISP to confirm compatibility
  • Supports IPv4 and IPv6 networking, as well as Windows, Mac, and Linux computers
  • Front-panel LEDs indicate status and simplify troubleshooting
10 new from $64.99 46 used from $23.95 3 refurbished from $24.77
$64.99 & FREE Shipping. Details In Stock. Sold by GoldenGateWholesale and Fulfilled by Amazon.

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Frequently Bought Together

  • Arris/Motorola SB6121 DOCSIS 3.0 Cable Modem in Non-Retail Packaging (Brown Box)
  • +
  • TP-Link N300 Wireless Wi-Fi Router, Up to 300Mbps (TL-WR841N)
Total price: $89.96
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This item Arris/Motorola SB6121 DOCSIS 3.0 Cable Modem in Non-Retail Packaging (Brown Box)
Customer Rating 4 out of 5 stars (829) 4 out of 5 stars (23859) 4 out of 5 stars (994) 4 out of 5 stars (2258)
Price $64.99 $69.95 $29.99 $88.49
Shipping FREE Shipping FREE Shipping FREE Shipping FREE Shipping
Sold By GoldenGateWholesale Amazon.com BlueDealz DOCSIS Networks
Item Weight 1 lb 1.52 lbs 1.52 lbs 1 lb
Item Dimensions 2 x 6 x 6 in 2 x 6.4 x 8.7 in 6.4 x 2 x 8.7 in 7 x 9.5 x 2.75 in
Connectivity Technology Ethernet Wired ethernet, wi-fi, rj45 Wired
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Product Information

Product Dimensions 6 x 2 x 6 inches
Item Weight 1 pounds
Shipping Weight 1.1 pounds (View shipping rates and policies)
Manufacturer Arris
ASIN B00768SBAU
Item model number P-10-23476
Customer Reviews
4.3 out of 5 stars 829 customer reviews

4.3 out of 5 stars
Best Sellers Rank #47 in Computers & Accessories > Networking Products > Modems
Date first available at Amazon.com November 22, 2010

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Customer Reviews

Top Customer Reviews

5.0 out of 5 starsA strong performer with up-to-date features
By Phil Stracchino (Technical Thug) on March 22, 2012
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.)
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5.0 out of 5 starsSame modem at a lower price!
By Nikesh on March 21, 2012
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.
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1.0 out of 5 starsSELLER SHIPS PREVIOUSLY REGISTERED MODEMS
By Jon C. McNeill on November 14, 2012
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.
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5.0 out of 5 starsFast and Comcast compatible
By Whitey on March 29, 2012
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!
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5.0 out of 5 starsExcellent!
By Musicfan on April 15, 2012
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.
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5.0 out of 5 starsGreat modem for TWC!!
By John on October 29, 2012
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.
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5.0 out of 5 starsThis is a great modem!
By Amazon Customer on May 22, 2012
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.
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Most Recent Customer Reviews

5.0 out of 5 stars... this to avoid Comcast rental fees and it worked great. Instantly...

Got this to avoid Comcast rental fees and it worked great. Instantly started working when connected, no hassle.

Published 20 hours ago by Mike K
5.0 out of 5 starsCost effective alternative to renting from cable company

I purchased this to use for my Comcast internet service instead of paying their monthly rental fee. It was easy to set up... Read more

Published 3 days ago by Mark G
5.0 out of 5 starsFive Stars

It was great for what I needed it for

Published 4 days ago by Victoria Centeno
1.0 out of 5 starsThere are a lot of scratches on it and the bad part of the story is...

When I opened the amazon box I found that it is not new!!!! there is no box for it and it is used. There are a lot of scratches on it and the bad part of the story is that it does... Read more

Published 6 days ago by Amazon Customer
5.0 out of 5 starsQuick setup

Easy plug-and-play install with quick setup from my ISP (I have Time Warner Cable). Seamless transition from my leased modem.

Published 20 days ago by Scott Hurley
1.0 out of 5 starsOnly worked for 6 months. Then it would work ...

Only worked for 6 months. Then it would work for 10 min amd you would have to reset it over and over.

Published 26 days ago by chris griggs
1.0 out of 5 starsOne Star

Did not work, spent way too much time trying to get it to work with TWC tech support

Published 1 month ago by Amazon Customer
1.0 out of 5 starsREFURBISHED MODEMS -- MAY NOT WORK FOR YOU

NOTE: THESE ARE NOT NEW.

I ordered this modem to eliminate the equipment fee from Comcast. Read more

Published 1 month ago by dougbo
5.0 out of 5 starsRock solid for 3+ years

I have had this unit in place for over three years now (Comcast). I have had no issues since activation. Read more

Published 1 month ago by SeekingValue
4.0 out of 5 starsFour Stars

Small but powerful

Published 1 month ago by Brad Easter

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