ARRIS / Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem – Retail Packaging

ARRIS  Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem - Retail Packaging image 01

Click image for informations


ARRIS / Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem – Retail Packaging
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…

Modem NOT defective – Comcast conspiracy?
I felt compelled to write this to help those who will encounter the problems I faced (and mentioned here). I’m one of the many people who wanted to avoid renting a modem from Comcast and bought this modem based on the stellar reviews, only to find that on the day of installation/activation that it “didn’t work”. Didn’t work meant experiencing the same symptoms that’s been mentioned here several times – “modem connects but then resets/power cycles/disconnects itself within a few minutes.” This happened to me on the day I activated my Comcast internet. The technician spent 1.5 hours trying to figure it out and ended up loaning me a Comcast modem (Motorola SB5120 DOCSIS2), which came up almost instantly and activated just as fast (go figure). He suggested I return this modem as it was defective, in his opinion. I didn’t like this since the probability of this was very small. But I saw what I saw and could not get past the first page of Comcast self activation screen with this…

Description : 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


Features :

  • 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
  • Internet download speeds up to 172 Mbps and upload speeds up to 131 Mbps based on your Cable provider service
  • Good for streaming Video and gaming on multiple devices at a time
  • Rear panel color coded for ease of installation
  • BROWN BOX models NOT VALID for this item, should report to Amazon immediately and RETURN to Seller
  • Docsis 3.0 with backward compatibility with 2.0 and 1.x
  • Front panel, easy to read operational LEDs to indicate status and simplify troubleshooting
  • Gigabit port to connect with router or computer

Leave a Reply

Your email address will not be published.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

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>