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Motorola® SURFboard® SB6121 DOCSIS 3.0 Cable Modem Item # 902317

Motorola® SURFboard® SB6121 DOCSIS 3.0 Cable Modem
$ 69 .99 / each $69.99

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2-Year Product Replacement Plan
$15.99 15.99

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High-speed connection to the Internet

  • Equipped with Ethernet connectivity.
  • Provides a maximum download speed of 171.537 Mbps and upload speed of 131.072 Mbps.


    High-speed connection to the Internet

    • Equipped with Ethernet connectivity. 
    • Provides a maximum download speed of 171.537 Mbps and upload speed of 131.072 Mbps. 
    • Front panel status lights.  Let you quickly see modem status for power, communications and errors.
    • DOCSIS 3.0 technology.  Permits the addition of high-speed data transfer to an existing cable TV system.
    • Power supply and Ethernet cable are included. 
    • ENERGY STAR— For products that meet federal guidelines for energy efficiency. 

    Product Details

    Item # 902317 
    Manufacturer # 575319-019-00  
    Eco-conscious helps save energy
    brand name Motorola
    height 5.2 in
    maximum upload speed 131.072 Mbps
    telephone cord included no
    modem standard DOCSIS 3.0
    width 1.7 in
    operating system compatibility Windows XP Service Pack 2; Windows Vista Service Pack 1; Windows 7; Mac 10.4+ (Ethernet connection only); Linux (Ethernet connection only); UNIX (Ethernet connection only)
    depth 5.2 in
    maximum download speed 171.537 Mbps
    eco-label/standard ENERGY STAR; RoHS
    connector type Ethernet
    manufacturer Motorola
    warranty length 2-year limited
    internal/external External
    Show More ▾

    Customer Reviews

    Rated 4.3 out of 5�by 46 reviewers.
    Rated 4 out of 5�by Work Great. I bought this to replace a refurbished modem that I purchased which did not work. So far no issues. November 18, 2015
    Rated 5 out of 5�by Smart move Replaced TW modem. Reduced payment by $8 per month. Increased download speed from 10 to 50 Mb/s. Increased upload from 1.2 to 6 Mb/s. October 12, 2015
    Rated 3 out of 5�by Product failing I have had this product for about a year. It is failing with increasing frequency. As noted by other reviewers, the solution is to remove power for 5 - 10 seconds to reset the modem. It then works for hours - days until it has to be power cycled to recover from failure again. Unfortunately it is the only choice for in store pickup. Maybe this time I'll pay the extra $15 for 2 year replacement of this $70 modem. Seems working life is under 2 years. September 15, 2015
    Rated 4 out of 5�by Delivers what you purchase I have an outdated modem. When I went to replace this one I was told that it was the cheapest but the best. Motorola brands I like. I have yet to use its full potential but so far so good. The light indicator stays up to date with every connection I make. Unfortunately having an outdated router makes this a difficult product to use. But it delivers my high speed as promised. August 31, 2015
    • 2015-11-25 T06:06:02.792-06:00
    • bvseo_lps, prod_bvrr, vn_prr_5.6
    • cp-1, bvpage1
    • co_hasreviews, tv_46, tr_46
    • loc_en_US, sid_902317, prod, sort_default
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    From the Manufacturer|Powered by Answers™

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    Demo Video



    Virtual Tour

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    1. Power Signal
    2. Receive Signal
    3. Send Signal
    4. Online Signal
    5. Link Signal
    6. Ethernet Connection
    7. Coaxial Cable Connecction
    8. Power Connection

    Power Signal

    Receive Signal

    Send Signal

    Online Signal

    Link Signal

    Ethernet Connection

    Coaxial Cable Connecction

    Power Connection

    Product Tour
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    CPE Network Interface10/100/1000Base-T Ethernet (RJ-45)
    Data ProtocolTCP/IP
    Dimensions5.24 in H x 5.24 in W x 1.65 in D
    (133 mm x 133 mm x 42 mm)
    Power9W (nominal)
    Input PowerNorth America: 105 to 125 VAC, 60 Hz 
    Outside North America: 100 to 240 VAC, 50 to 60 Hz
    RegulartoryRoHS compliant, ENERGY STAR V2 , COC V3, Compliant per the
    “Code of Conduct on Energy Consumption of Broadband
    Equipment”, CMM, MEPS



    Operating Temperature32 F to 104 °F (0 °C to 40 °C)
    Storage Temperature–22 °F to 158 °F (–30 °C to 70 °C)
    Operating Humidity5 to 95% R.H. (non-condensing)



    Modulation64 or 256 QAM
    Capture Bandwidth100 MHz (edge to edge)

    Maximum Theoretical Data Rate**

    DOCSIS: 171.537 Mbps (4 channels) / 42.884 (single channel)
    @ 256 QAM at 5.36 Msym/s

    ProvisioningSupports IP addressing using IPv4 and/or IPv6 (dual stack)



    Maximum Channel Rate**DOCSIS: 131.072 Mbps (4 channels) / 32.768 Mbps (single channel):
    @ 128 QAM at 6.4 MHz
    Frequency RangeDOCSIS 5-42 MHz (edge to edge), EuroDOCSIS and
    optional DOCSIS 5 to 65 MHz (edge to edge)
    CompatibilityPC: 90496, Pentium, or later; Windows Vista™, 2000, XP or 7 or Linux® with Ethernet connection (older versions of Windows, although not specifically supported, will work with this cable modem)
    Macintosh: Power PC or later; OS 9 or higher, Ethernet connection
    UNIX: Ethernet connection
    Home Networking: Ethernet router or wireless access point

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