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  • Motorola SB6121 DOCSIS 3.0 Cable Modem in Non-Retail Packaging (Brown Box)
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Motorola SB6121 DOCSIS 3.0 Cable Modem in Non-Retail Packaging (Brown Box)

753 customer reviews
| 30 answered questions

List Price: $130.00
Price: $82.95 & FREE Shipping
You Save: $47.05 (36%)
Only 10 left in stock.
Ships from and sold by Tax Free Mart.
  • 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
4 new from $82.95 11 used from $44.95 2 refurbished from $49.99

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$82.95 & FREE Shipping Only 10 left in stock. Ships from and sold by Tax Free Mart.

Frequently Bought Together

Motorola SB6121 DOCSIS 3.0 Cable Modem in Non-Retail Packaging (Brown Box) + TP-LINK TL-WR841N Wireless N300 Home Router, 300Mpbs, IP QoS, WPS Button
Price for both: $102.63

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Product Description

This is a refurbished Motorola DOCSIS 3.0 Cable Modem A new and improved version of the worlds 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). 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 Motorola SURFboard SB6180 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. Key Features: - Plug and play installation - Front panel LEDs indicate status and simplify troubleshooting - Multi-language user guides - User-friendly online diagnostics - Backward-compatible to DOCSIS/EuroDOCSIS 1.x and 2.0 - DOCSIS 3.0-certified (EuroDOCSIS 3.0-based) - Supports IPv4 and IPv6 to expand network addressing capabilities - Compatible with Windows, Macintosh, and UNIX computers. - Gigabit Ethernet (RJ-45) data port enable flexible, high-speed connectivity

Product Details

  • Item Weight: 1 pounds
  • Shipping Weight: 1 pounds (View shipping rates and policies)
  • ASIN: B00768SBAU
  • Item model number: P-10-23476
  • Average Customer Review: 4.5 out of 5 stars  See all reviews (753 customer reviews)
  • Amazon Best Sellers Rank: #8,486 in Electronics (See Top 100 in Electronics)
  • Product Warranty: For warranty information about this product, please click here


Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

109 of 110 people found the following review helpful By Phil Stracchino 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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64 of 65 people found the following review helpful 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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91 of 97 people found the following review helpful 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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61 of 65 people found the following review helpful 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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14 of 14 people found the following review helpful 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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16 of 17 people found the following review helpful 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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11 of 11 people found the following review helpful 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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