Motorola® SURFboard® SB6121 DOCSIS 3.0 Cable Modem
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Motorola® SURFboard® SB6121 DOCSIS 3.0 Cable Modem

Item # 902317 OfficeMax # 23354157
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.
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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. 
  • 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. 

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Item # 902317 
Manufacturer # 575319-019-00  
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
total recycled content 0%
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
connector type Ethernet
manufacturer Motorola
postconsumer recycled content 0%
warranty length 2-year limited
internal/external external

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Rated 4.5 out of 5�by 41 reviewers.
Rated 5 out of 5�by Buying this will save you a lot. I was leasing my internet modem from Comcast for $9 a month. It was as simple as purchasing, calling Comcast, and then connecting it to my router. That easy! July 27, 2015
Rated 5 out of 5�by works Either a modem works or it doesn't. So far, so good! July 21, 2015
Rated 5 out of 5�by Works great! No problems at all. Solid product! July 20, 2015
Rated 5 out of 5�by Faster than Lightning We returned the leased cable company modem and installed the Motorola SURFboard. I's faster than the one the cable guys supplied. I run speed tests that validate my feeling of FAST. When you install it, do a hard reboot on your downstream router because it needs to acquire the new MAC address from this puppy. Also, you MUST call cable company so they can register the new MAC address too. Save money every month with this great buy. July 14, 2015
  • 2015-07-31T23:28:47.402Z
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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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