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Customer Review

112 of 113 people found the following review helpful
5.0 out of 5 stars A strong performer with up-to-date features, March 22, 2012
Verified Purchase(What's this?)
This review is from: Arris/Motorola SB6121 DOCSIS 3.0 Cable Modem in Non-Retail Packaging (Brown Box) (Personal Computers)
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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Showing 1-10 of 11 posts in this discussion
Initial post: May 7, 2012 3:04:00 PM PDT
Sunny says:
Your review was helpful because it mentioned the good warranty. What is the warranty?

In reply to an earlier post on May 7, 2012 3:21:20 PM PDT
It comes with a one-year limited warranty, whereas many other cable modems have six-month warranties or less.

In reply to an earlier post on May 7, 2012 3:26:21 PM PDT
Sunny says:
Phil -- Thanks a lot for your speedy and helpful response.

Posted on Aug 20, 2012 5:31:13 PM PDT
Mine just crapped out on me after 3 months of use. Check out the Motorola guide for this modem, page 20 says they do not provide warranties to individual purchases, but only through cable providers (so if you got this through Comcast, Verizon, etc).

http://www.motorola.com/staticfiles/Video-Solutions/Products/Voice-and-Data-CPE/DOCSIS-Modems-Gateways-and-eMTAs/Cable-Modems/SB6121/_Documents/_StaticFiles/577212-001-a.pdf

In reply to an earlier post on Oct 18, 2012 8:19:03 PM PDT
Last edited by the author on Oct 18, 2012 8:26:05 PM PDT
J. Foley says:
I called Motorola and they say individuals do get a 1 year warranty. BUT that's not what the warranty link you provided says.
However, I found another place on Motorola's website that says retail purchasers have a one year warranty.
http://www.motorola.com/staticfiles/FileScan-Support/Support/US-EN/Home-Products/Staticfiles/577211-001-d%5B1%5D.pdf
"Warranty Information
SURFboard SB6121 DOCSIS 3.0 Cable Modem
Motorola Mobility, Inc. ("Motorola")
Retail Purchasers: If you purchased this Product directly from Motorola or from an authorized Motorola retail reseller,
Motorola warrants to you, the original end user customer, that (A) the Product, excluding Software, will be free from defects
in materials and workmanship under normal use, and (B) with respect to Software, (i) the media on which the Software is
provided will be free from defects in material and workmanship under normal use, and (ii) the Software will perform
substantially as described in its documentation. This Limited Warranty to you, the original end user customer, continues (A)
for Software and the media upon which it is provided, for a period of ninety (90) days from the date of purchase from
Motorola or an authorized Motorola reseller, and (B) for the Product (excluding Software), for a period of one (1) year from
the date of purchase from Motorola or from an authorized Motorola reseller. To take advantage of this Limited Warranty or
to obtain technical support, you must call the Motorola toll-free phone number 1-877-466-8646. Technical support charges
may apply. Motorola's sole and exclusive obligation under this Limited Warranty for retail sales shall be to repair or replace
any Product or Software that does not meet this Limited Warranty. All warranty claims must be made within the applicable
Warranty Period."

In reply to an earlier post on Oct 18, 2012 8:46:12 PM PDT
I probably provided the wrong warranty link then. My error.

Posted on Oct 26, 2012 12:16:38 PM PDT
If your modem fails to work, it might be the inner wire of the cable. Ours was about 1/4" too short and was not making connection. We redid the cable end with a new connector and it worked fine.

In reply to an earlier post on Mar 16, 2013 9:00:57 AM PDT
Sandra says:
I found this comment interesting. I have never used the cable installed at my house, and I've lived here for 10 years. This got me thinking that my cable line end is too old to correctly connect to such a new product? Do you have an idea as to how long the inner wire has to be? It appears to connect fine. Thanks for any help.

In reply to an earlier post on Mar 16, 2013 9:10:25 AM PDT
On the one hand, if the cable physically connects, it should work.

On the other, if the cable is at least ten years old (and you don't know how much older), the cable itself may be overdue for replacement. Coaxial cable deteriorates over time - the outer jacket hardens and can crack, the cable can get kinked, water can get into the cable.

If you're thinking about getting new service turned on, I would strongly recommend asking that your cable company start out by running a new cable from the street junction to your house, and state your concerns about the age of the cable.

In reply to an earlier post on Mar 16, 2013 9:18:28 AM PDT
Sandra says:
Maybe that is the reason Comcast isn't able to read the modem, although my gut is telling me that they have it set up wrong on their end. When I hooked up a tv and got a Comcast message, I thought that I was getting the signal ok, but maybe the line does need replacing. Thanks for your response.
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