ARRIS MOTOROLA SB6121 DOCSIS 3.0 Cable Modem Router w Power Cable - Model SB6121

ArmorTechs
(9190)
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US $20.00
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Condition:
Used

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US $9.74 USPS Ground Advantage®.
Located in: DeKalb, Illinois, United States
Delivery:
Estimated between Thu, Dec 11 and Tue, Dec 16 to 94104
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eBay item number:116573181356
Last updated on Dec 04, 2025 11:35:37 PSTView all revisionsView all revisions

Item specifics

Condition
Used: An item that has been used previously. The item may have some signs of cosmetic wear, but is ...
DOCSIS Standard
DOCSIS 3.0
Brand
Motorola
Type
Cable
Modem Device Type
Cable Modems & Routers
Color
Black
Model
Sb6121
MPN
SB6121
Features
Unlocked
Number of LAN Ports
1
Category

Item description from the seller

About this seller

ArmorTechs

99.6% positive feedback•2.5K items sold

Joined Jan 1999
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Detailed seller ratings

Average for the last 12 months
Accurate description
4.8
Reasonable shipping cost
4.7
Shipping speed
4.9
Communication
5.0

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  • e***d (2523)- Feedback left by buyer.
    Past 6 months
    Verified purchase
    Exactly as listed. Carefully packed to avoid damage in a sturdy box. Shipping charges reasonable. Very quickly shipped. Excellent communicator! Hassle-Free Transaction! Highly Recommended! Would Again Purchase From! Five Stars, Two Thumbs Up!
    Thermaltake lanparty MidiTower PC carrying harness bag: XASERBAG -A1700 vintage (#116544053272)
  • e***r (781)- Feedback left by buyer.
    Past year
    Verified purchase
    Extremely well packed to safeguard in shipping, very quick shipping from DeKalb, Illinois to Ontario, Canada, delays with shipping are to be expected however this was fast. The AMD A10-5700 3.4 GHz Quad-Core 4MB Socket FM2+ CPU - AD57000KA44HJ is exactly as pictured and described. Very high quality and very good condition, vendor very easy and very professional to deal with. Excellent value. Very professional transaction.
    AMD A10-5700 3.4 GHz Quad-Core 4MB Socket FM2+ CPU - AD57000KA44HJ (#116266701693)
  • s***t (373)- Feedback left by buyer.
    Past 6 months
    Verified purchase
    The item was shipped quickly, packaged very well and operates as described. This item has good value for the price. Great Ebayer A++++++++++
    Xylem WaterLOG Radar Water Level Sesor with SDI-12 Interface, H-3611 , H3611i (#116095822625)
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Product ratings and reviews

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4.6
252 product ratings
  • 199 users rated this 5 out of 5 stars
  • 33 users rated this 4 out of 5 stars
  • 7 users rated this 3 out of 5 stars
  • 2 users rated this 2 out of 5 stars
  • 11 users rated this 1 out of 5 stars

Easy to set up

Good value

Performs well

Most relevant reviews

See all 126 reviews
  • by cranberryduff0
    Mar 08, 2016Top favorable review

    Compact size, Works fine

    This modem arrived in thin packaging, no padding, no box, but included all necessary parts and nothing was damaged. The plastic housing looks lightly scratched all over as if it had been cleaned with a gritty cloth. But it works perfectly and was incredibly easy to set up. I called Time Warner to activate it and within a few minutes I was all set to return the leased modem and recoup the cost of this used unit in three months. To save money I switched to the slowest internet plan and have no problems streaming Netflix with the 1.5 mbps plan (note the decimal - that's one-and-a-half mbps, not fifteen) - For older people living alone on a limited income, buying a cheap used modem like this is a good investment.

    Verified purchase: YesCondition: Pre-OwnedSold by: surpluscablesupplys

  • by darthanianmaul
    Apr 21, 2016Top critical review

    Modem sucks and you might have to buy 2 or 3 a year

    Necessary evil!. I bought my own modem so I don't have to pay Comcast $10 a month. This is my 3rd modem. Even if you buy brand new these keep breaking down. This is a scam that is a partnership with Motorla, Aris and the providers.

    Verified purchase: YesCondition: NewSold by: twintwist

  • by romanstypula
    Sep 15, 2015

    Had to call Comcast to activate but it works great. Only issue was that power supply fell apart during shipping; 12V 1 Amp is generic enough. Happy.

    The product is perfect for getting saving some green from Comcast rental fees. It will be many years before they roll-out DOCSIS 3.1, make it affordable enough after they do and available. So in the mean time, save money on your monthly bill. This one works great for the 50mb ish speeds.

    Verified purchase: YesCondition: Pre-OwnedSold by: xiayuanhuan

  • by ethelred_the_unready
    May 10, 2017

    If is what it is, and it does what it does.

    The Motorola SB6121 is a reasonably small DOCSIS 3.0 cable modem. It can handle data rates up to a nominal 200Mb/s (actual 195Mb/s), and can work with most cable providers (check compatibility before buying). This model does not incorporate a router. Setup is simple - connect the cable cord, the Ethernet cord, and power and you're away. Setup with the cable company was simple - one phone call, read one number, and the new modem was working. One irritation with a cable modem (as opposed to a modem-router) is that if you connect a different computer/router/etc, you have to power cycle the modem. All in all, this has been a great deal for me, eliminating the modem rental and other fees . Now I just have to see if it lasts.

    Verified purchase: YesCondition: Pre-OwnedSold by: speedy-ship

  • by diamond33156
    Nov 07, 2015

    Very easy to use

    The product is plug and play. Only thing to do is call Comcast and tell the numbers that are on the back of the modem. They asked me if I will be using a router to have it ready as well. So I connected during the process that took less tan a minute and it is working perfect. I was looking to the perfect match and most of the people recommended to use a router Netgear WNDR3700 that is very reliable and I can confirm this as well.

    Verified purchase: YesCondition: Pre-OwnedSold by: crossedarrowscommemoratives

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