Motorola SB6121 4×4 Cable Modem

  • 4×4 DOCSIS 3.0 Cable Modem Only – WiFi Router Sold Separately
  • Compatible with Time Warner, Charter, Spectrum, Cox, Cablevision & More!
  • Includes Support for IPv6 & Remote Management
  • 4×4 Channel Bonding Supports Wired Download Speeds up to 172 Mbps
  • Not Compatible with Comcast Xfinity
(15 customer reviews)
SKU: CMD111B-FBA

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Description

Motorola SB6121 Product Details

The Motorola SB6121 DOCSIS 3.0 Cable Modem is compatible with Charter, Cox, Cablevision, Spectrum & Time Warner Cable. This model features a 4×4 channel bonded design that supports wired download speeds of more than 100 Mbps in each direction. This model has both a small physical footprint, but also was designed to conserve energy, making it one of the more “green” networking options available for your home.

 

Interface & Additional Features

The SB6121 cable modem features some of the best remote management features from Arris/Motorola. This model can be accessed online to manage settings, firmware, & more! These user-friendly diagnostics can help you diagnose connection issues, and prevents you from having to call your provider to your home to correct network problems. Additionally, this model provides the ability to provision and manage IP multicast and supports AES traffic encryption for enhanced security.

Additionally, this model supports IPv4 and IPv6 for enhanced network stability and security. Connect any wireless router for instant WiFi connections with all of your devices.

 

SB6121 Compatibility

This model has been tested & works great with Time Warner Cable, Spectrum, Cox, Cablevision & other US-Based cable providers. Since this model’s firmware is pretty versatile, even if you don’t see your provider listed here, it’s worth giving them a call to see if this model will work with your service. Always call before ordering, even if your provider is supported, to ensure that this model is a good fit for your location and service plan. Please note that this model is no longer approved for use with Comcast Xfinity.

What’s Included:

  • Motorola SB6121 Cable Modem
  • Ethernet Cable
  • Power Supply Cable
  • Online Installation Manual

Will this work with my internet company?

This Motorola modem is primarily used and is compatible with Spectrum, Time Warner Cable, Charter, Cox, & Cablevision service in most areas. To verify that this model will work in your area, always contact your service provider’s customer service prior to placing your order with us to confirm that this model will work with your service plan. Some service plan speeds may not be supported.

Specification

Overview

Brand

Arris, Motorola

Processor

Weight 1 lbs
Dimensions 9 × 6 × 3 in
Brand

Arris, Motorola

Model Number

SB6121

Condition

Grade A – Certified Renewed

Contents

Ethernet Cable, Modem, Power Cable

Interface

Cable Modem

Color

Black

Ethernet Ports

1-Port

DOCSIS Version

DOCSIS 3.0

DOCSIS Channels

4 x 4

Compatible Providers

Charter Spectrum, Cox Communications, Cablevision

Internet Plan

Sparklight 50

Return Policy

90 Day Returns

Display

Weight 1 lbs
Dimensions 9 × 6 × 3 in
Brand

Arris, Motorola

Model Number

SB6121

Condition

Grade A – Certified Renewed

Contents

Ethernet Cable, Modem, Power Cable

Interface

Cable Modem

Color

Black

Ethernet Ports

1-Port

DOCSIS Version

DOCSIS 3.0

DOCSIS Channels

4 x 4

Compatible Providers

Charter Spectrum, Cox Communications, Cablevision

Internet Plan

Sparklight 50

Return Policy

90 Day Returns

RAM

Weight 1 lbs
Dimensions 9 × 6 × 3 in
Brand

Arris, Motorola

Model Number

SB6121

Condition

Grade A – Certified Renewed

Contents

Ethernet Cable, Modem, Power Cable

Interface

Cable Modem

Color

Black

Ethernet Ports

1-Port

DOCSIS Version

DOCSIS 3.0

DOCSIS Channels

4 x 4

Compatible Providers

Charter Spectrum, Cox Communications, Cablevision

Internet Plan

Sparklight 50

Return Policy

90 Day Returns

Storage

Weight 1 lbs
Dimensions 9 × 6 × 3 in
Brand

Arris, Motorola

Model Number

SB6121

Condition

Grade A – Certified Renewed

Contents

Ethernet Cable, Modem, Power Cable

Interface

Cable Modem

Color

Black

Ethernet Ports

1-Port

DOCSIS Version

DOCSIS 3.0

DOCSIS Channels

4 x 4

Compatible Providers

Charter Spectrum, Cox Communications, Cablevision

Internet Plan

Sparklight 50

Return Policy

90 Day Returns

Video Card

Weight 1 lbs
Dimensions 9 × 6 × 3 in
Brand

Arris, Motorola

Model Number

SB6121

Condition

Grade A – Certified Renewed

Contents

Ethernet Cable, Modem, Power Cable

Interface

Cable Modem

Color

Black

Ethernet Ports

1-Port

DOCSIS Version

DOCSIS 3.0

DOCSIS Channels

4 x 4

Compatible Providers

Charter Spectrum, Cox Communications, Cablevision

Internet Plan

Sparklight 50

Return Policy

90 Day Returns

Connectivity

Weight 1 lbs
Dimensions 9 × 6 × 3 in
Brand

Arris, Motorola

Model Number

SB6121

Condition

Grade A – Certified Renewed

Contents

Ethernet Cable, Modem, Power Cable

Interface

Cable Modem

Color

Black

Ethernet Ports

1-Port

DOCSIS Version

DOCSIS 3.0

DOCSIS Channels

4 x 4

Compatible Providers

Charter Spectrum, Cox Communications, Cablevision

Internet Plan

Sparklight 50

Return Policy

90 Day Returns

Features

Weight 1 lbs
Dimensions 9 × 6 × 3 in
Brand

Arris, Motorola

Model Number

SB6121

Condition

Grade A – Certified Renewed

Contents

Ethernet Cable, Modem, Power Cable

Interface

Cable Modem

Color

Black

Ethernet Ports

1-Port

DOCSIS Version

DOCSIS 3.0

DOCSIS Channels

4 x 4

Compatible Providers

Charter Spectrum, Cox Communications, Cablevision

Internet Plan

Sparklight 50

Return Policy

90 Day Returns

Battery

Weight 1 lbs
Dimensions 9 × 6 × 3 in
Brand

Arris, Motorola

Model Number

SB6121

Condition

Grade A – Certified Renewed

Contents

Ethernet Cable, Modem, Power Cable

Interface

Cable Modem

Color

Black

Ethernet Ports

1-Port

DOCSIS Version

DOCSIS 3.0

DOCSIS Channels

4 x 4

Compatible Providers

Charter Spectrum, Cox Communications, Cablevision

Internet Plan

Sparklight 50

Return Policy

90 Day Returns

General

Color

Black

Customer Reviews

4.7
15 reviews
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15 reviews for Motorola SB6121 4×4 Cable Modem

Clear filters
  1. EBeard

    Works as well as cable company rental, but much cheaper after 4 months. Four or five months rental paid for it. Now saving that money on cable bill.

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  2. Christine

    I love it🤗🤗

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  3. Kyle Trusler

    5 years later it’s still going strong. not sure what else to say about the modem. it’s just worked since day one. it’s nice and compact and light. saved me a ton of money not renting from $pectrum.

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  4. stabby

    We have bought and returned three different modem/router combos in the past few weeks in setting up WiFi for our new house. This one is by far the best. We’ve had a great connection and no problems.

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  5. Nanc’s notes

    This item is now saving me $125.00 per year from my cable company!!

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  6. notsure

    works great. all the way across my apartment. PC via ethernet. super fast. and excellent connections via my phones and TV via WIFI all over the place.

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  7. David Gomez

    Works great

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  8. The Big Picture

    This modem works fine when it’s working. But sometimes it gives up and I have to power cycle it and the router to get things going again. This modem doesn’t play well with Zoom teleconferencing – e.g., calls will sometimes freeze up. The ARRIS technical support is the opposite of world-class; they’re too quick to say buy a new modem as well as not thoroughly knowledgeable about their own product. The online support files are mostly a mess and are way less than thorough. I’m hesitant to buy another of their products in the future. If I do, it’ll be with an extended warranty that’s easy to return the product if needed.

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  9. Jtredway

    Works fine and does acceptable job to replace rented modems

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  10. KAYE KEREKES

    Love it, works great

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  11. JE

    Works ok, does what it should.

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  12. Hailee

    Never have to reset it and have had no issues with our internet. Would recommend

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  13. Ripley

    Works well. Had old one for 8 years

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  14. O. Elfourgni

    Works but not capable of fast enough speed

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    0
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