Arris CM820A Cable Modem Gateway DOCSIS 3.0 for Comcast
Arris CM820A DOCSIS 3.0 Cable Modem
Arris CM820A DOCSIS 3.0 Cable Modem
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Arris CM820A Cable Modem Gateway DOCSIS 3.0 for Comcast
Arris CM820A DOCSIS 3.0 Cable Modem
Arris CM820A DOCSIS 3.0 Cable Modem

Arris CM820A DOCSIS 3.0 Cable Modem – Fast & Reliable Internet with IPv6 Support

  • High-Performance: Enjoy fast and reliable internet with the Arris CM820A’s advanced DOCSIS 3.0 technology.
  • IPv6 Support: Stay ahead of the curve with the modem’s support for the latest IPv6 internet protocol.
  • Easy Setup: Get up and running quickly with the simple, user-friendly setup process.
  • Cost-Effective: Save money by eliminating monthly rental fees with this cost-effective cable modem solution.
(166 customer reviews)
SKU: CMD033B-FBA2

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Description

Arris CM820A Product Details

Support a small, US-Based business and stop renting your cable modem from your internet provider! The Arris CM820A DOCSIS 3.0 Cable Modem is one of the most cost-effective models available today. This model gives you the most features for your money such as high speed wired data speeds, enhanced security, and parental controls, among others. This model is also compatible with several major US cable providers including Comcast Xfinity, Mediacom, Suddenlink, Time Warner and Spectrum. As a result of this model’s wide compatibility, it’s easy to use this model – even if you relocate to another service area.

Arris CM820A Specs

The Touchstone DOCSIS 3.0 8×4 Cable Modem CM820A delivers ultra-high speed data access to cable service sufficient for both home and business use. Designed to support the services desired most by users, the CM820A enables the home or small business to be productive with the speed and performance found only in devices with 8×4 channel bonding.  This model is also one of the most reliable sold on ModemGuides, and is highly recommended to our customers seeking the most cost-effective way of removing their monthly modem rental fee.

Speeds included with the CM820A

The Arris CM820A comes equipped with 8×4 channel bonding which allows support for download speeds up to 343 Mbps according to the manufacturer’s website. We recommend pairing this model with an inexpensive router to take full advantage of your home network. The speeds offered with this model compete well with other models available today, especially when cost of equipment is being factored into the equation. As a result, this Arris modem is the perfect fit for home or business use and allows customers to remove their modem rental fee for as little up-front investment as possible.

 

Arris CM820A Specs & Features

Feature Description
Max Download Speed Up to 340 Mbps
Compatible Internet Providers Comcast Xfinity, Charter Spectrum, Cox, and more
Channel Bonding 8 downstream and 4 upstream channels
DOCSIS Support DOCSIS 3.0
Ethernet Ports 1 Gigabit Ethernet port
Cable Compatibility Supports both standard and high-speed internet
LED Lights Easy-to-read front panel LEDs
Power External power adapter
Setup Easy setup with Quick Start Guide

What’s Included:

  • Arris CM820A Cable Modem
  • Ethernet Cable
  • Power Supply Cable
  • Online Installation Manual

Will this work with my internet company?

This Arris modem is primarily used and is compatible with Comcast Xfinity, Spectrum, Charter, Time Warner Cable, Mediacom, & Suddenlink 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.

Does the CM820A Work with Comcast Xfinity?

In most locations in the US, Comcast does support the CM820A, however it’s always a good idea to give them a call before you go ahead and purchase this for your service. Compatibility can be influenced by your service location as well as the plan you’re on with Comcast. We always recommend checking with your provider before ordering to prevent any compatibility issues.

Here’s our guide on self-installing your Comcast Xfinity cable modem so you can see exactly how quick and easy it is to get your new CM820A activated.

Arris CM820 Manual & Install Guide

Specification

Overview

Brand

Arris

Processor

Weight 1 lbs
Dimensions 9 × 6 × 3 in
Ports

1 Ethernet (RJ-45) LAN, 1 Coaxial, 1 Power Supply
Brand

Arris
Condition

Grade A – Certified Renewed
Contents

Ethernet Cable, Modem, Power Cable
DOCSIS Channels

8 x 4
DOCSIS Version

DOCSIS 3.0
Compatible Providers

Comcast Xfinity, Charter Spectrum, Mediacom, Suddenlink
Color

Black
Ethernet Ports

1-Port
Interface

Cable Modem
Features

Easy-Installation, For Business, For Home, Video Streaming
Model Number

CM820A
Wired Download Speeds

Up to 343 Mbps

Display

Weight 1 lbs
Dimensions 9 × 6 × 3 in
Ports

1 Ethernet (RJ-45) LAN, 1 Coaxial, 1 Power Supply
Brand

Arris
Condition

Grade A – Certified Renewed
Contents

Ethernet Cable, Modem, Power Cable
DOCSIS Channels

8 x 4
DOCSIS Version

DOCSIS 3.0
Compatible Providers

Comcast Xfinity, Charter Spectrum, Mediacom, Suddenlink
Color

Black
Ethernet Ports

1-Port
Interface

Cable Modem
Features

Easy-Installation, For Business, For Home, Video Streaming
Model Number

CM820A
Wired Download Speeds

Up to 343 Mbps

RAM

Weight 1 lbs
Dimensions 9 × 6 × 3 in
Ports

1 Ethernet (RJ-45) LAN, 1 Coaxial, 1 Power Supply
Brand

Arris
Condition

Grade A – Certified Renewed
Contents

Ethernet Cable, Modem, Power Cable
DOCSIS Channels

8 x 4
DOCSIS Version

DOCSIS 3.0
Compatible Providers

Comcast Xfinity, Charter Spectrum, Mediacom, Suddenlink
Color

Black
Ethernet Ports

1-Port
Interface

Cable Modem
Features

Easy-Installation, For Business, For Home, Video Streaming
Model Number

CM820A
Wired Download Speeds

Up to 343 Mbps

Storage

Weight 1 lbs
Dimensions 9 × 6 × 3 in
Ports

1 Ethernet (RJ-45) LAN, 1 Coaxial, 1 Power Supply
Brand

Arris
Condition

Grade A – Certified Renewed
Contents

Ethernet Cable, Modem, Power Cable
DOCSIS Channels

8 x 4
DOCSIS Version

DOCSIS 3.0
Compatible Providers

Comcast Xfinity, Charter Spectrum, Mediacom, Suddenlink
Color

Black
Ethernet Ports

1-Port
Interface

Cable Modem
Features

Easy-Installation, For Business, For Home, Video Streaming
Model Number

CM820A
Wired Download Speeds

Up to 343 Mbps

Video Card

Weight 1 lbs
Dimensions 9 × 6 × 3 in
Ports

1 Ethernet (RJ-45) LAN, 1 Coaxial, 1 Power Supply
Brand

Arris
Condition

Grade A – Certified Renewed
Contents

Ethernet Cable, Modem, Power Cable
DOCSIS Channels

8 x 4
DOCSIS Version

DOCSIS 3.0
Compatible Providers

Comcast Xfinity, Charter Spectrum, Mediacom, Suddenlink
Color

Black
Ethernet Ports

1-Port
Interface

Cable Modem
Features

Easy-Installation, For Business, For Home, Video Streaming
Model Number

CM820A
Wired Download Speeds

Up to 343 Mbps

Connectivity

Weight 1 lbs
Dimensions 9 × 6 × 3 in
Ports

1 Ethernet (RJ-45) LAN, 1 Coaxial, 1 Power Supply
Brand

Arris
Condition

Grade A – Certified Renewed
Contents

Ethernet Cable, Modem, Power Cable
DOCSIS Channels

8 x 4
DOCSIS Version

DOCSIS 3.0
Compatible Providers

Comcast Xfinity, Charter Spectrum, Mediacom, Suddenlink
Color

Black
Ethernet Ports

1-Port
Interface

Cable Modem
Features

Easy-Installation, For Business, For Home, Video Streaming
Model Number

CM820A
Wired Download Speeds

Up to 343 Mbps

Features

Weight 1 lbs
Dimensions 9 × 6 × 3 in
Ports

1 Ethernet (RJ-45) LAN, 1 Coaxial, 1 Power Supply
Brand

Arris
Condition

Grade A – Certified Renewed
Contents

Ethernet Cable, Modem, Power Cable
DOCSIS Channels

8 x 4
DOCSIS Version

DOCSIS 3.0
Compatible Providers

Comcast Xfinity, Charter Spectrum, Mediacom, Suddenlink
Color

Black
Ethernet Ports

1-Port
Interface

Cable Modem
Features

Easy-Installation, For Business, For Home, Video Streaming
Model Number

CM820A
Wired Download Speeds

Up to 343 Mbps

Battery

Weight 1 lbs
Dimensions 9 × 6 × 3 in
Ports

1 Ethernet (RJ-45) LAN, 1 Coaxial, 1 Power Supply
Brand

Arris
Condition

Grade A – Certified Renewed
Contents

Ethernet Cable, Modem, Power Cable
DOCSIS Channels

8 x 4
DOCSIS Version

DOCSIS 3.0
Compatible Providers

Comcast Xfinity, Charter Spectrum, Mediacom, Suddenlink
Color

Black
Ethernet Ports

1-Port
Interface

Cable Modem
Features

Easy-Installation, For Business, For Home, Video Streaming
Model Number

CM820A
Wired Download Speeds

Up to 343 Mbps

General

Color

Black

Customer Reviews

4.8
166 reviews
135
24
7
0
0

166 reviews for Arris CM820A DOCSIS 3.0 Cable Modem – Fast & Reliable Internet with IPv6 Support

Clear filters

  1. Sara K Customer –

    Worked great for a few months to replace the Comcast xFinity modem we rented, only a few disconnect problems. Then we moved to a new area, now we’re back and when I called to reconnect it with new service at Comcast/xfinity they are claiming it is their modem and trying to charge me a rental fee for MY OWN MODEM! Apparently when they connected it, the moron who did it registered my modem as “comcast owned” so now when they put in my serial and CMAC number, it comes up as theirs. Even though they admit this model is not one they use currently…. they said there is nothing they can do about it except charge me the monthly rental fee of $11/mo, again, FOR MY OWN MODEM. Furious.

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  2. Gene Peck Customer –

    Great way to “cut the cable” bill. Save $5.00 a month by not paying the cable company a rental fee on cable modem. Installed by cable internet support in less than 10 minutes. It will pay for itself in less than a year.

    0
    0

  3. Z. K. Customer –

    It took the cable guy less than 5 minutes to get our service up and running. This is a great option to purchase instead of renting a modem from your cable company.

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  4. Kirk Lewis Customer –

    Hooked it up and worked like a charm! Cable company was charging monthly fee so cost of this item will pay for itself in just a few months!!

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    0

  5. garfield peterson Customer –

    Didn’t need it.

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    0

  6. David Forgacs Customer –

    Works great with Suddenlink too!

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    0

  7. Dennyg73 Customer –

    Worked out of the box after provisioning by Wavecable

    0
    0

  8. Eliz Customer –

    I’ve had this over a year and it has been reliable. It gets updates automatically from Comcast, so no trouble at all.

    0
    0

  9. Srikanth Customer –

    have been using this modem since August 2013 with Comcast Xfinity and Webpass ISPs (100 Mbps). With Comcast Xfinity, found it delivering near the download speeds on Performance 25 (25Mbps), Performance Pro(100 Mbps) and Blast! Pro (150 Mbps) tiers.

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    0

  10. Peggy Sue Hubbard Customer –

    I like the modem and it does its job – I had to go with 4 stars because how do you love a modem….

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    0

  11. Vikash Tailor Customer –

    Great product. Jus saved me 12$ on my internet bill by returning the exact modem I was renting for 4 years.

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    0

  12. Zachary Brewer Customer –

    Works great, showed up like new and had no issues

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    0

  13. John W. Conover Customer –

    Item performing well and as advertised.

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    0

  14. michael smith Customer –

    Everything as described. Great transaction.

    0
    0

  15. ANACHRONISTIC BOB Customer –

    didn’t work sent it back for a refund

    0
    0

  16. Eduardo Fernandez Customer –

    Worked flawlessly, same identical model to what the ISP was leasing me for $12 a month …

    0
    0

  17. Jill H. Customer –

    very happy

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    0

  18. W. H. V Customer –

    have had this for two years and haven’t had any issues outside of outages here and there on xfinity’s end. I recently upgraded from blast web to extreme150 and i’m not able to get top speeds unless I plug the internet directly from the modem to my desktop. thinking of upgrading my router or getting a combo to get the new speeds. this will get those EX150 speeds but not if you’re using a router with it. worked fine on blast web(75mbps/10mbps).overall, quality product that will work until you get up to the extreme tier speeds. 4.5 stars.

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    0

  19. rim69 Customer –

    Not used anymore. But it worked great. Now have a combo unit modem + router.

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    0

  20. Customer Customer –

    Really solid cable modem. Very easy to set up, and activate (we use Xfinity). It is compatible with just about all the major cable providers.We get very fast and consistent speeds up and down. This device has not yet once dropped the signal. I highly recommend it to anyone needing a reliable cable modem for their internet connection.

    0
    0

  21. D. Green Customer –

    SAVED LOTS OF MONEY BUYING THIS VS RENTING THE SAME MODEM FROM COMCAST. RENTAL FEE SAVINGS HAVE ALREADY PAID FOR THIS MODEM.

    0
    0

  22. Maria Arakil Customer –

    Never a problem. Had it for 5 years.

    0
    0

  23. Christian Almada Customer –

    It work perfect

    0
    0

  24. Customer Customer –

    don’t need to pay 10 dollars a month to rent one. great!

    0
    0

  25. Michael Speakes Customer –

    Arrived on time, its the model and brand my cable company uses, works great with Apple Airport.

    0
    0

  26. Andrea Customer –

    Works perfectly. It is exactly the same of my Internet provider WOW that was charging me $7 per moth. Super easy to install, no setup. Just give a call to the provider to register the serial number then plug it the same way the old one and voila!

    0
    0

  27. Pokemon Customer –

    I switched again to Comcast today. It has been 3 times I switched the internet services and long time use of this modem. It’s durable, great quality, compatible with providers.

    0
    0

  28. Anouar Customer –

    great. it still working perfectly for more than a year now.

    0
    0

  29. Jeff A Customer –

    Works well with my Comcast / Xfinity. My old modem didn’t have as many channels and wasn’t giving me my full speed. This one works great and I still don’t have to pay them a modem rental fee.

    0
    0

  30. Sasi M. Peddada Customer –

    working and setup is easy

    0
    0

  31. AnnL Customer –

    It replaced my cable modem. Love it!

    0
    0

  32. john Customer –

    This is the exact same modem TDS rents for $4.95 a month. It works great if you just want to ethernet hook up to one computer at a time. If you want wifi you could hook up a separate router this box. Comes with ethernet cable.

    0
    0

  33. Enrique lopez Customer –

    That what i needed

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    0

  34. Web Shepherd Customer –

    Arrived in excellent condition. Easy to install. It recognized my WiFi connection immediately, and then I called my Internet provider to have them stop charging me for their own modem. This purchase should be able to pay for itself by the end of the year. I like the fact that this modem uses an electrical power cord that plugs directly into the surge protector … no transformer to deal with.

    0
    0

  35. Mikhail Customer –

    I got it 18months ago so I don’t have to PAY TWC monthly fees. I think I already got my money back.Works great.

    0
    0

  36. Customer Customer –

    Just what I needed

    0
    0

  37. Andres Customer –

    they working good with my ISP no problem help me to save money.

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    0

  38. Douglas M. Customer –

    Good.

    0
    0

  39. Sandra J Pace Customer –

    Worked as soon as I plugged it in….

    0
    0

  40. JJ-Idaho Customer –

    Plug it in, and you are done. Works great.

    0
    0

  41. Spencer Customer –

    Works fine, would do business again. 😊

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    0

  42. Claire Foster Customer –

    Compact and easy to install same model used by RCN

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    0

  43. Customer Customer –

    No problems at all.

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    0

  44. Jeff Customer –

    The modem worked as advertised, but I was a dummy and didn’t read the advertisement and bought a modem that doesn’t go as fast as I needed. For what it is, it worked just fine and without over-heating while I re-ordered the right modem, but Arris has never done me wrong. I gifted the modem to someone who could use it within their speed-package, and it still works.

    0
    0

  45. Ivy Customer –

    cheaper than buying it from anywhere else and works pretty well. havent had any problems with it yet.

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    0

  46. Oleg Gritskov Customer –

    works as expected, no problems at all. I am using Atlantic Broadband internet provider.

    0
    0

  47. Phillip Ogwal Customer –

    it works the way it is suppose to

    0
    0

  48. Shoe Expert Customer –

    Excellent product. More than meets expectations and reduced my cable bill by $10.00!

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  49. John R. Customer –

    After 2 years of non-stop use, I’d say it’s a quality product – so far no issues. We used it as a replacement for the rented cable modem from comcast/xfinity (we figured it’s cheaper after about 1year and it was)

    0
    0

  50. GetItWrite Customer –

    Bought this to replace a Comcast (equivalent) model. Works great and saves me the fee. You do need to get Comcast to validate the modem before it can be used.

    0
    0
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