Facebook Twitter Pinterest
Qty:1
Include

2-Year PC Peripherals Protection Plan

from SquareTrade

  • Coverage for product breakdowns and malfunctions
  • 24/7 customer support
  • Free shipping on all repairs with no deductibles or hidden fees
  • Fully transferable with gifts. Cancel anytime, full refund in the first 30 days
  • If you purchase this service plan and eligible product for this service plan, you acknowledge that Amazon may send the service plan seller relevant product and price information for the purpose of administering the plan

2-Year Camera Protection Plan

from Assurant Solutions

  • Delivered by e-mail; register and file claims online or by phone
  • We will fix the item, replace or pay up to the original purchase cost of the item. Zero deductible
  • Fully transferable if you give as a gift
  • Cancel anytime
  • Some customers may purchase service plans and eligible products on Amazon. If you purchase this service plan and eligible product for this service plan, you acknowledge that Amazon may send the service plan seller relevant product and price information for the purpose of administering the plan.
FREE Shipping on orders over $49. Details
Used: Very Good | Details
Sold by Miakota
Condition: Used: Very Good
Comment: Motorola cable modem SB6121 in perfect working condition. Includes: cable modem,power supply and ethernet cable. NOT compatible with Comcast.
Other Sellers on Amazon
Add to Cart
$79.99
& FREE Shipping on eligible orders. Details
Sold by: DealStop
Add to Cart
$78.95
+ $4.94 shipping
Sold by: Phase 3, LLC
Add to Cart
$79.99
+ $3.99 shipping
Sold by: Elem Technologies
Have one to sell? Sell on Amazon

ARRIS SURFboard SB6121 DOCSIS 3.0 Cable Modem (Black,Retail Packaging)

4.3 out of 5 stars 22,344 customer reviews
| 461 answered questions

Price: $79.99 & FREE Shipping. Details
In Stock.
Download Speed: 172 Mbps
Cable Modem
    This fits your .
  • Enter your model number to make sure this fits.
  • Wired modem only, does NOT include WIFI Router or VOIP Telephone adapter. Gigabit Ethernet port to connect to computer or Router for fast downloads.
  • Compatible with Comcast, Time Warner, Cox, Charter, Bright House Networks and MOST Small Regional Cable Providers (NOT compatible with Verizon FiOS or AT&T U-verse). Requires CABLE Internet Service, if not sure your provider is CABLE call them to confirm
  • Internet speeds based on your Cable providers service - up to 172 Mbps download and 131 Mbps upload. 4 Download and 4 Upload Channels.
  • BROWN BOX models NOT VALID for this item when sold as New, should report to Amazon immediately and RETURN to Seller
  • Good for streaming HD Video and gaming
62 new from $70.00 293 used from $28.00 2 refurbished from $30.00

Upgrade Your Gadgets.
Shop the must-have new computer products. Learn more
$79.99 & FREE Shipping. Details In Stock. Sold by WOW !!! and Fulfilled by Amazon.

Frequently Bought Together

  • ARRIS SURFboard SB6121 DOCSIS 3.0 Cable Modem  (Black,Retail Packaging)
  • +
  • TP-LINK N300 Wireless Wi-Fi Router, Up to 300Mbps (TL-WR841N)
Total price: $104.94
Buy the selected items together


Product Description

Capacity: Download Speed: 172 Mbps | Model: Cable Modem

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


Product Information

Capacity:Download Speed: 172 Mbps  |  Model:Cable Modem

Technical Details

Collapse all
Summary : Screen Size, Screen Resolution, Graphics Coprocessor, Graphics Card RAM
RAM 2 TB
Brand Name Arris
Series Surfboard Extreme
Item model number SB6121
Item Weight 14.4 ounces
Product Dimensions 2 x 6.4 x 8.7 inches
Item Dimensions L x W x H 2 x 6.4 x 8.7 inches
Color Black
Computer Memory Type DDR3 SDRAM
Power Source (105 - 125)VAC, 60Hz/(100 - 240)VAC, (50 - 60)Hz

Technical Specification

Additional Information

ASIN B004XC6GJ0
Customer Reviews
4.3 out of 5 stars 22,343 customer reviews

4.3 out of 5 stars
Best Sellers Rank #1 in Electronics > Computers & Accessories > Computer Components > Internal Modems
#16 in Electronics > Computers & Accessories > Networking Products > Modems
Shipping Weight 14.4 ounces (View shipping rates and policies)
Domestic Shipping Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available June 1, 2011

Warranty & Support

Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.
Product Warranty: For warranty information about this product, please click here [PDF ]

Feedback

Would you like to tell us about a lower price?

From the Manufacturer

ARRIS SURFboard Wi-Fi Cable Modem SBG6580 ARRIS SURFboard Wi-Fi Cable Modem SBG6700-AC ARRIS SURFboard Wi-Fi Cable Modem SBG6900-AC
SBG6580 Wi-Fi Modem SBG6700-AC Wi-Fi Modem SBG6900-AC Wi-Fi Modem
Download Speed 343 Mbps 343 Mbps 686 Mbps
DOCSIS 3.0 3.0 3.0
Gigabit Ethernet Ports 4 2 4
Wi-Fi N300 dual-switched AC1600 dual-band concurrent AC1900 dual-band concurrent
Pre-set Wi-Fi Security
Wireless Guest Access
Energy Efficient Ethernet
2 Year Limited Warranty
Tech Support by ARRIS

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By J. Cameron on January 12, 2013
Style Name: Cable ModemSize: Download Speed: 343 Mbps Verified Purchase
Swapped out my Comcast rental modem, was up and running in just a few minutes, and now I don't have to pay the $7 modem rental fee to Comcast. I'm provisioned for the 105/20 Mbps package and typically get 120/20.5 Mbps.

This modem can utilize up to 8 channels of downstream for a theoretical max speed of 343 Mbps whereas the Motorola SB6121 and other earlier/cheaper DOCSIS 3 modems can only utilize 4 channels maxing your download speeds out at 172 Mbps. Just something to think about if you plan on using this modem for a few years as speeds offered will inevitably increase.

Also, it *does* support IPv6 even though Comcast's page doesn't list it as certified yet. Motorola's data sheet specifically lists the SB6141 as IPv6 ready and tests with an Apple AirPort Extreme (v7.6.4) and MacBook Pro running 10.9 confirm this.

Update 2/4/13: Still working great without issue.
Update 3/25/13: Still not even a single reboot required.
Update 8/28/13: Still working great...
Update 7/8/14: First issue... had an outage for 15 min. Reset the modem and it didn't resolve the issue. Called Comcast, they reset something on their end and I was up and running again. First issue since I bought it.
Update 4/5/2015: Comcast recently upgraded my speed tier and I'm consistently getting speeds up to 180/25 Mbps.
66 Comments 2,569 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
Style Name: Cable ModemSize: Download Speed: 172 Mbps 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
91 Comments 2,801 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
By SmurfsRiot on April 17, 2013
Style Name: Cable ModemSize: Download Speed: 343 Mbps Verified Purchase
I purchased this SB6141 to replace my VERY old Linksys DOCSIS 1.0 modem. I recently upgraded to 75mb download from RCN (Chicago) and DOCSIS 1.0 was going to bottleneck my speed.

The modem (as are all modems) was extremely easy to install. Plug in, call ISP and you are good. The speeds are fantastically fast and this modem was well worth the price.

****I purchased this white SB6141 over the black SB6141 for one main reason. If you do your research you will notice that the Black SB6141 are only issued to ISP's from Motorola. Meaning, if you purchase a black model from Amazon (or any store), you are purchasing a used or refurbished product (they also ship in ordinary brown cardboard boxes). The only consumer model of the SB6141 is the white model which ships in traditional packaging. The white model is THE ONLY model that comes with a warranty from Motorola. I know this because I called Motorola twice and spoke to two (2) different reps who said the same thing; "Black boxes are for ISP's and do not have a warranty while the white boxes are for consumers and come with a warranty". Further complicating matters is that the black SB6141's usually have old firmware on them because they were generally made a few years ago. White SB6141 have newer or the newest firmware because they are shipping directly from the manufacturer. Your ISP may or may not flash customer owned modems to the newest firmware. If you purchase the Black model, you might be purchasing a 3 year old modem with no chance of upgrading it (also remember that you cannot flash your own modem's firmware).

Do yourself a favor and research this white consumer model over the black ISP model before you pull the trigger.
Read more ›
36 Comments 1,561 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
Style Name: Cable ModemSize: Download Speed: 343 Mbps Verified Purchase
Tired of paying my ISP to rent one of their modems.

Lots of research and this one just kept coming up on top for me; reliable manufacturer, good reviews by others, ease of setup, built for the future with 8-up 4-down bonding. Works just like promised with never a hitch. My only complaint is, as others have mentioned, the lights are irritatingly bright; this I solved by mounting under my desk where it is out of sight.

TIP 1: Make sure you purchase this "Retail Packaging - White". Don't try to save the few bucks buying the black version; all my research shows they are refurbished rentals from ISP providers and the common complaint is that they stop working about the time the warranty expires.
TIP 2: Make sure your ISP supports the firmware. My cable company does not specifically show this model but it supports the same model two generations back - close enough. All I did was a Google search " modems supported by mediacom des moines" (my ISP, my city). Take the time to do your research. I did and I'm VERY happy (except for the irritating lights).
TIP 3: One mis-notion: Just because this modem is "state-of-the-art" for home use, don't expect speed increases just by swapping modems. (Though my wife and I swear our pages load faster even though speed tests show the same up/down rates as before.) You have to up your internet package (dollars) to do this.

One month update - as pleased today as the day I set it up. Never a bump or a glitch.

Eight months and I'm as happy as the day I set it up!

A year and a half - I'm still as happy as the day I set it up!
19 Comments 974 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse