Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem – Motorola Retail Packaging

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.

Product Features

  • 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

Click Here For More Information

2 comments for “Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem – Motorola Retail Packaging

  1. T. Hyatt
    March 12, 2013 at 12:02 AM

    Does the job well/tip for Comcast users 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

  2. Ayame
    March 12, 2013 at 12:20 AM

    Stay with the SB6120 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.

Leave a Reply

Your email address will not be published. Required fields are marked *