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Motorola SURFboard SB6121 DOCSIS 3.0 CPE Cable Modem

B&H # MOSB6121 MFR # 575319-019-00
In Stock
Free Expedited Shipping
You Pay: $79.99
Product Highlights
  • DOCSIS / EuroDOCSIS 3.0 Certified
  • Compatible with DOCSIS 1.0 / 1.1 / 2.0
  • GigE Port w/ Auto Negotiate + Auto MDIX
  • Four Upstream / Downstream Channels Each
  • 10 / 100 / 1000 Base-T Ethernet Port
  • Internal Low Pass Filter
  • AES Traffic Encryption
  • Supports IPv4 and IPv6
  • User-Friendly Online Diagnostics
  • Windows, Macintosh, and UNIX Compatible

The SURFboard SB6121 DOCSIS 3.0 CPE Cable Modem from Motorola is an easy-to-use option for home-businesses or large businesses alike, that provides high-bandwidth transfer rates for large multimedia files. It offers channel bonding of up to four downstream and four upstream channels, with data rates well above 100 Mb/s in both directions. While it is built for DOCSIS 3.0, it is of course backward compatible with 1.0, 1.1, and 2.0 standards.

With a 10 / 100 / 1000 Base-T Ethernet (RJ-45) port, and easy-to-read LED status indicators, the SB6121 is convenient to install with older technology, and its operational status is visible at a glance. For high-end residential users, workers with a home office, or even medium to large businesses, the SB6121 from Motorola is an excellent option that offers great performance and simplicity in a variety of applications.

DOCSIS 3.0
The SB6121 enables channel bonding of up to four downstream channels and four upstream channels, which allows an operator to offer their customers advanced multimedia services with data rates of well over 100 Mb/s in both directions
Economic and Flexible
The modem provides operators with an economic option for providing Ultra-Broadband services, with four times the current maximum user data throughput, approximating 160 Mbps in DOCSIS mode and 195 Mbps in EuroDOCSIS mode, without the need for hybrid fiber coax (HFC) plant upgrade
Enhanced Network Management
With the ability to provision and manage IP multicast, GigE (RJ-45) data port with Auto Negotiate and Auto MDIX, and user-friendly online diagnostics--the SB6121 has got the features to give you full-control over network management and maintenance
Backward Compatibility
Backward compatible to DOCSIS 1.0, 1.1 and 2.0, the SB6121 also supports both IPv4 and IPv6, Advanced Encryption Services, and all other DOCSIS 3.0 standards
Low Pass Filter
Internal Low Pass Filter to eliminate MoCA signal overload
Power Saving Energy Conservation Switch
This allows you to disable the modem when it is not in use (optional)
DOCSIS 3.0 Certified
Channel bonding of up to four downstream channels and four upstream channels increasing data rates of well over 100 Mbps in each direction. It supports IPv4 and IPv6 to expand network addressing capabilities, and also supports AE traffic encryption for enhanced security and protection
Operation Details
Modulation Downstream: 64 or 256 QA
Upstream: QPSK and 8, 16, 32, 64, 128 QAM
Bandwidth 100 MHz (edge to edge)
DOCSIS: ≤ 24 MHz
EuroDOCSIS: ≤ 32 MHz
Data Transfer Rate Downstream:
DOCSIS: 171.537 Mb/s (4 channels) / 42.884 (single channel) at 256 QAM at 5.36 Msym/s
EuroDOCSIS: 222.464 Mb/s (4 channels) / 55.616 (single channel) at 256 QAM at 6.952 Msym/s

Upstream:
DOCSIS: 131.072 Mb/s (4 channels) / 32.768 Mb/s (single channel): at 128 QAM at 6.4 MHz
EuroDOCSIS: 131.072 Mb/s (4 channels) / 32.768 Mb/s (single channel): at 128 QAM at 6.4 MHz
Symbol Rate Downstream:
DOCSIS 64 QAM 5.057 Msym/s; 256 QAM 5.361 Msym/s
EuroDOCSIS 64 QAM 6.952 Msym/s; 256 QAM 6.952 Msym/s

Upstream:
160, 320, 640, 1280, 2560, 5120 ksym/s
Level Range Downstream:
-15 to 15 dBmV

Upstream:
Level range per channel (Multiple Transmit Channel mode disabled, or only Multiple Transmit Channel mode enabled with one channel in the TCS)
DOCSIS/EuroDOCSIS:
TDMA:
Pmin to +57 dBmV (32 QAM, 64 QAM)
Pmin to +58 dBmV (8 QAM, 16 QAM)
Pmin to +61 dBmV (QPSK)
S-CDMA:
Pmin to +56 dBmV (all modulations), where:
Pmin = +17 dBmV, 1280 kHz modulation rate
Pmin = +20 dBmV, 2560 kHz modulation rate
Pmin = +23 dBmV, 5120 kHz modulation rate


Level range per channel (two channels in the TCS)
TDMA:
Pmin to +54 dBmV (32 QAM, 64 QAM)
Pmin to +55 dBmV (8 QAM, 16 QAM)
Pmin to +58 dBmV (QPSK)
S-CDMA:
Pmin to +53 dBmV (all modulations), where:
Pmin = +17 dBmV, 1280 kHz modulation rate
Pmin = +20 dBmV, 2560 kHz modulation rate
Pmin = +23 dBmV, 5120 kHz modulation rate

Level range per channel (three or four channels in the TCS)
TDMA:
Pmin to +51 dBmV (32 QAM, 64 QAM)
Pmin to +52 dBmV (8 QAM, 16 QAM)
Pmin to +55 dBmV (QPSK)
S-CDMA:
Pmin to +53 dBmV (all modulations), where:
Pmin = +17 dBmV, 1280 kHz modulation rate
Pmin = +20 dBmV, 2560 kHz modulation rate
Pmin = +23 dBmV, 5120 kHz modulation rate
RF Specifications Bonded Channel RF Level Tolerance: 10dBmV
Input Impedance 75 Ohms (nominal)
Output Impedance 75 Ohms (nominal)
Frequency Range Downstream:
DOCSIS and EuroDOCSIS 108 to 1002 MHz (edge to edge), Optional 91 to 1002 MHz (edge to edge)

Upstream:
DOCSIS 5-42 MHz (edge to edge), EuroDOCSIS and optional DOCSIS 5 to 65 MHz (edge to edge)
Frequency Measurement Frequency Plan:
EuroDOCSIS Annex A
DOCSIS Annex B
J-DOCSIS Annex B, modified for Japan Frequencies
Security Security: DOCSIS 3.0 Security (BPI+, EAE, SSD)
Network Management SNMP v2 and v3
IP Interface Supports IP addressing using IPv4 and / or IPv6 (dual stack)
Compatibility PC: 90496, Pentium, or later; Windows Vista, 2000, XP or 7 or Linux with Ethernet connection (although not specifically supported, older versions of Windows 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
General Attributes
Cable Connection 75 Ohms F-connector
Network Interface 10 / 100 / 1000 Base-T Ethernet (RJ-45)
Data Link Protocol TCP / IP
Power Supply 9W nominal
105 - 125VAC, 60 Hz
100 - 240VAC, 50 - 60 Hz
Compliance RoHS compliant, ENERGY STAR V2 , COC V3, Compliant per the "Code of Conduct on Energy Consumption of Broadband Equipment", CMM, MEPS
Environmental Requirements Operating Temperature: 32 to 104° F (0 to 40° C) Storage Temperature: -22 to 158° F (-30 to 70° C) Operating Humidity: 5 to 95% (non-condensing)
Dimensions (H x W x D) 5.2 x 5.2 x 1.7" (13.3 x 13.3 x 4.2 cm)
Motorola SURFboard SB6121 DOCSIS 3.0 CPE Cable Modem
  • Ethernet Cable
  • Power Cable
  • 1-Year Limited Warranty
  • REVIEW SNAPSHOT®

    by PowerReviews
    MotorolaSURFboard SB6121 DOCSIS 3.0 CPE Cable Modem
     
    4.7

    (based on 83 reviews)

    Ratings Distribution

    • 5 Stars

       

      (64)

    • 4 Stars

       

      (15)

    • 3 Stars

       

      (3)

    • 2 Stars

       

      (0)

    • 1 Stars

       

      (1)

    97%

    of respondents would recommend this to a friend.

    Pros

    • Easy to set up (72)
    • Fast (56)
    • Highly compatible (44)
    • Small (39)
    • Secure (26)

    Cons

      Best Uses

      • Home (58)
      • Small office (24)
      • Secure networks (13)
      • Heavy downloading (5)
      • Surfing the web (5)
        • Reviewer Profile:
        • High bandwidth user (48), Low bandwidth user (21), Quality oriented (7)
        • Primary use:
        • Personal (70), Business (8)
        • Computer Platform:
        • PC (36), Mac (35)

      Most Liked Positive Review

       

      Happy Surfing

      After being notified that Time Warner was raising their modem rental fee to $6/month I decided it was time to buy my own. After a lot of research I decided on the...Read complete review

      After being notified that Time Warner was raising their modem rental fee to $6/month I decided it was time to buy my own. After a lot of research I decided on the SB6141--but it was ninety bucks, and, if bought new, only came in white. So I bought the well-reviewed SB6121. I was slightly concerned about the talk about it being outdated and whatnot, but the date of manufacture on the modem TWC was renting me was 2009, so I'm pretty confident I'll get my money's worth out of my new modem. In a year's time I will have recouped the cost of this modem, and that's a year that I won't be paying to rent lame TWC equipment. If you're wondering about speeds, my connection is marginally faster, but I didn't buy the modem with the expectation of getting more than my plan offered. TWC is clearly the limiting agent. All in all, I'm very pleased with my decision.

      VS

      Most Liked Negative Review

       

      It's okay I suppose, but still....

      Installation took much longer than necessary. The documentation omits on very important fact- Your ISP has to be contacted to activate the new modem. Otherwise you're whistling in the wind.
      Read complete review

      Installation took much longer than necessary. The documentation omits on very important fact- Your ISP has to be contacted to activate the new modem. Otherwise you're whistling in the wind.

      Performance is good.

      It has a built in DHCP server that you can't shut off. Only the cable company can do that. It conflicts with your own DHCP server on your router. That's another annoyance. Google SB6121 and DHCP.

      Reviewed by 83 customers

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      (0 of 1 customers found this review helpful)

       
      4.0

      Surfboard SB6121 DOCSS 3.0 CPE Cable Mod

      By meng

      from Wa

      Verified Buyer

      Comments about Motorola SURFboard SB6121 DOCSIS 3.0 CPE Cable Modem:

      Couldn't hook up to network first day because Comcast kept fooling around with its servers

      Share this review

      (1 of 1 customers found this review helpful)

       
      5.0

      Good, fast modem

      By SalvoCA

      from Los Angeles, CA

      About Me High bandwidth user

      Verified Buyer

      Pros

      • Easy To Set Up
      • Fast
      • Highly Compatible
      • Small

      Cons

        Best Uses

        • Home
        • Small Office

        Comments about Motorola SURFboard SB6121 DOCSIS 3.0 CPE Cable Modem:

        Easy to install. No complaints about speed.

        • Primary use:
        • Personal
        • Computer Platform:
        • Mac

        Share this review

        (1 of 1 customers found this review helpful)

         
        5.0

        Solid and reliable

        By ChichiDragon

        from Atlanta, GA

        About Me High bandwidth user

        Verified Buyer

        Pros

        • Easy To Set Up
        • Fast
        • Highly Compatible
        • Small

        Cons

        • Distracting Lights

        Best Uses

        • Home
        • Small Office

        Comments about Motorola SURFboard SB6121 DOCSIS 3.0 CPE Cable Modem:

        I bought this modem to (1) avoid using Comcast's sub-par modem+router, and (2) to save $ a month in renting out said mediocrity. I must say that it performs exceptionally well.. no restarts required, no overheating. A very dependable option that will also save you some $$ compared to renting equipment from your internet provider. The only slightly annoying things I can think of are the blue lights on the front - wish they were more subtle.

        • Primary use:
        • Personal
        • Computer Platform:
        • Mac

        Share this review

        (1 of 1 customers found this review helpful)

         
        5.0

        superior performance, pays for itself

        By k-cleffer

        from Columbus, OH

        About Me High bandwidth user

        Verified Buyer

        Pros

        • Easy To Set Up
        • Fast
        • Highly Compatible
        • Secure
        • Small

        Cons

          Best Uses

          • Home
          • Small Office

          Comments about Motorola SURFboard SB6121 DOCSIS 3.0 CPE Cable Modem:

          The SB6121 was easy to set up and is providing far better internet access and speed than the cheap-o rental modem provided me by the cable company. Not to mention the cable company's modem cost $/mo. B&H had the lowest price on this particular model and it will pay for itself in about 13 or 14 months.

          • Primary use:
          • Personal
          • Computer Platform:
          • Mac

          Share this review

           
          5.0

          Works great

          By Tai in Austin

          from Austin, TX

          Verified Buyer

          Pros

          • Easy To Set Up

          Cons

            Best Uses

              Comments about Motorola SURFboard SB6121 DOCSIS 3.0 CPE Cable Modem:

              I've only had it a couple of weeks but no issue so far.

              BTW, if you're with Time-Warner (and I'm sure it's the same with other cable internet providers), you have to call them to "provision" your new modem before they allow it to connect to the internet. It involves giving them the model and MAC address info.

              • Primary use:
              • Personal
              • Computer Platform:
              • Mac

              Share this review

               
              5.0

              Easy hookup

              By Tbirdvet

              from Michigan

              About Me High bandwidth user

              Verified Buyer

              Pros

              • Easy To Set Up
              • Fast

              Cons

                Best Uses

                  Comments about Motorola SURFboard SB6121 DOCSIS 3.0 CPE Cable Modem:

                  I got this to replace my SB5120 which was still working but just wanted a newer higher speed 3 modem. I have Comcast so after connecting it launched the Comcast web site and did the self install. However I did call Comcast to let them know what I just did because the last time I did a self install Comcast started to charge me the monthly rental fee. For some reason when they see a new modem they believe you got it from them which makes no sense to me. I like the lights (which are too big and bright for some people). My speeds did not change (did not expect them to). Unit runs a little warmer than my previous unit but no issue.

                  • Primary use:
                  • Personal
                  • Computer Platform:
                  • Mac

                  Share this review

                   
                  5.0

                  SURFboard SB6124 upgrading to DOCIS 3.0

                  By Philip

                  from Oakland, CA

                  About Me High bandwidth user

                  Verified Buyer

                  Pros

                  • Easy To Set Up
                  • Fast
                  • Highly Compatible
                  • Secure
                  • Small

                  Cons

                    Best Uses

                    • Home
                    • Secure Networks

                    Comments about Motorola SURFboard SB6121 DOCSIS 3.0 CPE Cable Modem:

                    I'm happy with this purchase. Was informed to upgrade modem to take advantage of "new technology." You'll have to let your service provider know the modem's serial number and MAC address which is labeled at the bottom of the device. You'll have to reboot your router to complete the installation. Remember to reboot the router. Real eazy!

                    • Primary use:
                    • Personal
                    • Computer Platform:
                    • PC

                    Share this review

                     
                    5.0

                    Beats renting from your cable company!

                    By Pedro

                    from Boston, MA

                    Verified Buyer

                    Comments about Motorola SURFboard SB6121 DOCSIS 3.0 CPE Cable Modem:

                    I don't know why we waited so long before buying our own cable modem. The Surfboard does exactly what we want, doesn't have anything extra, and will save us $8 per month on our cable bill. Just make sure you're not looking for stuff like a wi-fi network or extra jacks to plug in directly to the box. This one is very simple, but it works great!

                    Share this review

                     
                    5.0

                    Reliable and Easy to Set Up

                    By Swisher

                    from New York, NY

                    About Me High bandwidth user

                    Verified Buyer

                    Pros

                    • Easy To Set Up
                    • Fast
                    • Highly Compatible

                    Cons

                      Best Uses

                      • Home
                      • Small Office

                      Comments about Motorola SURFboard SB6121 DOCSIS 3.0 CPE Cable Modem:

                      Why spend that $ a month on a cable modem rental when you can own it and save? (I think the cable companies will manage somehow)This is a great replacement for any system using the DOCSIS 3.0 type modem. Haven't had any issues since it booted up and was configured (remotely) by the cable co.

                      • Primary use:
                      • Personal
                      • Computer Platform:
                      • Other

                      Share this review

                       
                      3.0

                      It's okay I suppose, but still....

                      By Mr. Stinky

                      from Berkeley, CA

                      About Me High bandwidth user

                      Verified Buyer

                      Pros

                        Cons

                        • Unconfigurable

                        Best Uses

                        • Home

                        Comments about Motorola SURFboard SB6121 DOCSIS 3.0 CPE Cable Modem:

                        Installation took much longer than necessary. The documentation omits on very important fact- Your ISP has to be contacted to activate the new modem. Otherwise you're whistling in the wind.

                        Performance is good.

                        It has a built in DHCP server that you can't shut off. Only the cable company can do that. It conflicts with your own DHCP server on your router. That's another annoyance. Google SB6121 and DHCP.

                        • Primary use:
                        • Personal
                        • Computer Platform:
                        • Mac

                        Share this review

                         
                        5.0

                        Works great right out of the box

                        By Xero Shoes

                        from Boulder, CO

                        About Me High bandwidth user

                        Verified Buyer

                        Pros

                          Cons

                            Best Uses

                              Comments about Motorola SURFboard SB6121 DOCSIS 3.0 CPE Cable Modem:

                              I've used this modem before... in fact, I was leasing one from Comcast and, ultimately, paid about 3x more than if I had just bought the thing!So, when we moved, I bought this one. It was effortless to hook it up and get it running.

                              • Primary use:
                              • Personal
                              • Computer Platform:
                              • PC

                              Share this review

                               
                              4.0

                              Straightforward, works well

                              By lehasb

                              from Maine

                              About Me Low bandwidth user

                              Verified Buyer

                              Pros

                                Cons

                                  Best Uses

                                    Comments about Motorola SURFboard SB6121 DOCSIS 3.0 CPE Cable Modem:

                                    Right now, I have a low bandwidth connection, but I wanted a modem that was DOCSIS 3 capable in case I upgrade in the future. The SB6121 fits my needs of a DOCSIS 3 modem that isn't as expensive as the ones designed for really high bandwith users. I have had no issues with it so far.

                                    • Primary use:
                                    • Personal
                                    • Computer Platform:
                                    • PC

                                    Share this review

                                     
                                    5.0

                                    Simple but Effective

                                    By JR

                                    from Vancouver WA

                                    About Me Low bandwidth user

                                    Verified Buyer

                                    Pros

                                    • Easy To Set Up

                                    Cons

                                    • none

                                    Best Uses

                                    • Home

                                    Comments about Motorola SURFboard SB6121 DOCSIS 3.0 CPE Cable Modem:

                                    Installed easily by itself on Comcast. Seemed slow to authenticate by Comcast but after that everything was easy and simple. The modem does the job and saves me the overpriced cable modem rental cost.

                                    • Primary use:
                                    • Personal
                                    • Computer Platform:
                                    • PC

                                    Share this review

                                     
                                    5.0

                                    Works Great, Fast.

                                    By Jesse

                                    from Niceville, Florida

                                    About Me Low bandwidth user

                                    Verified Buyer

                                    Pros

                                    • Easy To Set Up
                                    • Fast
                                    • Small

                                    Cons

                                      Best Uses

                                      • Home
                                      • Small Office

                                      Comments about Motorola SURFboard SB6121 DOCSIS 3.0 CPE Cable Modem:

                                      I use this modem with Cox Internet. It was a breeze to hook up and activate. It has been powered up for a month with no problems. My download speed is much faster than with my old DOCSIS 2.2 modem.

                                      • Primary use:
                                      • Personal
                                      • Computer Platform:
                                      • PC

                                      Share this review

                                       
                                      5.0

                                      Rock Solid and Fast!

                                      By Tom k.

                                      from White Bear Lake, MN

                                      About Me High bandwidth user

                                      Verified Buyer

                                      Pros

                                      • Dependable
                                      • Easy To Set Up
                                      • Fast
                                      • Secure
                                      • Small

                                      Cons

                                      • none

                                      Best Uses

                                        Comments about Motorola SURFboard SB6121 DOCSIS 3.0 CPE Cable Modem:

                                        Why rent when you can own? This is my second modem I have purchased in the last year. After the recent price increases in cable internet I replaced my mothers rented modem with this modem. It is faster then the forgotten outdated rented modem and has a payback in less then 8 months.

                                        • Primary use:
                                        • Personal
                                        • Computer Platform:
                                        • PC

                                        Share this review

                                         
                                        4.0

                                        Meets its specification

                                        By Vern the voice

                                        from Tampa Bay Area

                                        About Me Low bandwidth user

                                        Verified Buyer

                                        Pros

                                        • Easy To Set Up
                                        • Fast
                                        • Small

                                        Cons

                                          Best Uses

                                          • Home
                                          • Small Office

                                          Comments about Motorola SURFboard SB6121 DOCSIS 3.0 CPE Cable Modem:

                                          Worked out of the box, now we will see how reliable it is. Low enough power drain that it will be on 24/7. Needs a description of the router requirements that can be used with the modem....

                                          • Primary use:
                                          • Personal
                                          • Computer Platform:
                                          • PC

                                          Share this review

                                           
                                          5.0

                                          Great modem - fast

                                          By Wayouthere

                                          from San Francisco

                                          Comments about Motorola SURFboard SB6121 DOCSIS 3.0 CPE Cable Modem:

                                          More compact than I had imagined. Yet powerful I terms if signal strength and a better performer on wireless speed than I've had with previous modems.

                                          Share this review

                                           
                                          5.0

                                          Great item!

                                          By Luisa

                                          from Lakeside, CA

                                          About Me Low bandwidth user

                                          Verified Buyer

                                          Pros

                                          • Easy To Set Up
                                          • Fast
                                          • Highly Compatible
                                          • Secure
                                          • Small

                                          Cons

                                            Best Uses

                                            • Home

                                            Comments about Motorola SURFboard SB6121 DOCSIS 3.0 CPE Cable Modem:

                                            Easy setup! Works with Mac. So far no problems.

                                            • Primary use:
                                            • Personal
                                            • Computer Platform:
                                            • Mac

                                            Share this review

                                            (1 of 1 customers found this review helpful)

                                             
                                            4.0

                                            Good product for Comcast customer

                                            By Francis

                                            from Houston TX

                                            Verified Buyer

                                            Pros

                                            • Easy To Set Up
                                            • Highly Compatible
                                            • Secure
                                            • Small

                                            Cons

                                              Best Uses

                                              • Home

                                              Comments about Motorola SURFboard SB6121 DOCSIS 3.0 CPE Cable Modem:

                                              Small, not as big as the Comcast provided; however, it doesn't come with built-in router.Anyway, I can save as high as $8/m as I have been paying to Comcast for the last several years in Houston. After less than 8 months, it makes even!

                                              • Primary use:
                                              • Personal
                                              • Computer Platform:
                                              • PC

                                              Share this review

                                              (1 of 1 customers found this review helpful)

                                               
                                              5.0

                                              Huge Internet Speedup

                                              By Vidguy

                                              from Langley,WA

                                              About Me High bandwidth user

                                              Verified Buyer

                                              Pros

                                              • Easy To Set Up
                                              • Fast
                                              • Highly Compatible
                                              • Secure
                                              • Small

                                              Cons

                                                Best Uses

                                                • Small Office

                                                Comments about Motorola SURFboard SB6121 DOCSIS 3.0 CPE Cable Modem:

                                                Moving up to DOCSIS 3.0 has doubled my tested internet speeds (50mbs download and 15mbs upload)!
                                                This modem installed easily and my internet provider had no problem addressing it. Nothing negative for me to say.

                                                • Primary use:
                                                • Business
                                                • Computer Platform:
                                                • Mac

                                                Share this review

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