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Arris CM820A Cable Modem
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Arris

Arris CM820A DOCSIS 3.0 Cable Modem

Rated 4.45 out of 5 based on 22 customer ratings
(22 customer reviews)

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  • Compatible with Xfinity by Comcast, Spectrum / Time Warner, Suddenlink, & More!
  • DOCSIS 3.0 Modem with 8×4 Channel Bonding – Backwards Compatible With DOCSIS 2.0
  • Supports Internet Download Speeds up to 343 Mbps
  • WiFi not included – Wireless Router Sold Separately
  • 1 Gigabit Ethernet Port to Connect to Computer or Router
  • NOT COMPATIBLE with Cox Cable
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  • Description
  • Additional information
  • About brand
  • Shipping & Delivery
Description

Arris CM820A Cable Modem Product Details

The ARRIS DOCSIS 3.0 8×4 Cable Modem CM820A features high speed data access to cable service subscribers for both home & business. The CM820 meets the productivity needs with the speed and performance found only in the 8×4 bonded channel cable environment along with industry-leading ARRIS reliability.

The CM820A offers data services at speeds over 300Mbps; competing with VDSL and fiber. Additionally, this modem provides a platform to deliver competitive high capacity commercial services to businesses.

Fast & Simple Internet with the Arris CM820A

Get ready to experience the Internet’s express lane! Whether you’re checking out streaming media, downloading new software, or checking your email, the Touchstone CM820 Cable Modem brings it all to you up to eight times faster than standard DOCSIS 2.0 cable modems.

The Arris CM820A Cable Modem provides an Ethernet connection for use with either a single computer or home/office Local Area Network (LAN)

Is the CM820 compatible with Comcast?

Yes! This model is compatible with Comcast Xfinity in most areas. Please contact your Comcast office or their customer service to confirm compatibility in your area with your service plan.

Does the Arris CM820A have WiFi?

No. This model is just a cable modem and only supports wired internet service. Click here to check out our list of routers that pair perfectly with this model!

Additional information
Weight2 lbs
Dimensions9 × 6 × 3 in
Additional Features

Energy-Efficient, HD Multi-Media Streaming, Static & Dynamic IP

Brand

Arris

Color

Black

Compatibility

Cox Communications, Xfinity by Comcast

WiFi Type

No Built-In WiFi

DOCSIS Version

DOCSIS 3.0

Ethernet Ports

1

Model Number

CM820A

Package Contents

Ethernet Cable, Modem, Power Cable

Wired Download Speeds

343 Mbps

About brand
Since 1997, when the first SURFboard was launched in Retail, SURFboard modems have been amongst the leading modems in the market and saving consumers money on their monthly rental fees. When you choose an ARRIS SURFboard, you’re joining a 60-year legacy of innovation from the company that invented digital TV and brought wireless Internet into the home with the first cable modem gateway. The same company that the world’s leading service providers choose to connect millions of people around the world to the Internet. Please note that some versions of this product will come with Motorola branding. This is due to a merging of Arris and Motorola a few years ago. While this does not affect the functionality of the product in any way, we feel it's important to mention.
Shipping & Delivery

Frequently Asked Questions

What is the return policy?

Return for a Refund:

Return for a refund on any order is permitted up to 30 days after your order arrives at the shipping address specified for your order. If you need to return your order, please contact us within the 30-day return period to request an RMA.

Return for an Expedited Replacement:

Return for a replacements are permitted up to 90 days after the date your order was marked as delivered at your shipping address. Please contact us to request one.

Wholesale Customers:

If you purchased your equipment wholesale from us in a large order and are in need of multiple returns/replacements, please contact us directly for assistance.

When will my order ship?

Most orders ship within 1-2 business days, but we’ll let you know if there’s any delay with your order as soon as we are aware of it.

Check out our Shipping & Delivery information page for more information.

I changed my mind after ordering. Can I still cancel?

We can process cancellations for orders that have not yet gone into transit. If you are interested in cancelling your order, please give us a call, or send us an email & we will cancel if we are able to.

Once an order has shipped, if you change your mind, simply email us & mark the unopened order as “refused” or “return to sender” when it arrives.

Check out our Shipping & Delivery information page for more information.

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You can see each product's estimated arrival date during the checkout process. During checkout, you can choose an estimated arrival date from the options provided.

Entering your shipping destination ZIP code or allowing HazelNetworks.com to use your current location can result in greater accuracy for your estimated arrival date. Certain products may require additional days to process prior to shipping. This will be reflected in the estimated arrival date. If for some reason you don't receive your product, you may be eligible for a replacement product if you notify us during your return and exchange time period.

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Delivery Guarantees

Purchases of product through HazelNetworks.com are subject to a destination contract. This means that risk of loss for these products passes to you upon the carrier's delivery to your ship-to address, and Hazel Networks is not responsible for any loss, theft or damage after delivery.

22 reviews for Arris CM820A DOCSIS 3.0 Cable Modem

Powered by
4.5
Based on 22 reviews
5 star
63
63%
4 star
22
22%
3 star
9
9%
2 star
4
4%
1 star
0%
Showing 5 of 22 reviews (4 star). See all 22 reviews
  1. Rated 4 out of 5

    Beth – November 2, 2015

    I was told by Comcast to replace my outdated modem (that I owned.) I purchased this Arris model, and couldn’t be happier. It did not come with installation instructions however, so I emailed the supplier (on a Saturday) and they replied same day with installation instructions. Impressive! I wanted to try to install it on my own, without calling Comcast. However, I found out halfway through the step by step process that I needed to contact Comcast first, in order to give them the model number of this new modem, so that the activation would be successful. No worries…the internet provider agent completed the installation remotely, and I am up and running! Now I am finally enjoying the internet speed and strength that I have been paying for, and not receiving with the old, outdated modem.

    (0) (0)
  2. Rated 4 out of 5

    Mr. Cheap Skate – December 1, 2015

    I was getting notices from Comcast that my old Motorola cable modem was not giving me the benefits of higher bandwidth speed…which I ignored for the past year assuming they were just trying to get me to spend more on a faster speed plan. Then recently I started having intermittent internet loss, so I decided to buy this modem . While waiting for it to arrive I upgraded the firmware on my netgear N300 wireless router and it seemed like that gave me a stable internet signal. When the modem arrived I set it up and to my surprise it increased my speed from 7 to 12 .
    The reason for not giving 5 stars is the the seal of the plastic bag that contained the modem was opened, but the modem itself was new and the cable also. There were no instructions that came with it, but I followed the instructions on comcast website and was able to easily get it set up without calling comcast.

    (0) (0)
  3. Rated 4 out of 5

    Samwise – January 13, 2016

    After trying out 3 different cable modems, I’m somewhat convinced this Arris CM820A is the one to get for Comcast. My situation is we weren’t getting the speed that we signed up, and our connection also drops off periodically. After checking Comcast’s approved modem list, I purchased 3 different ones to test, and this Arris one seem to be the most stable.

    It’s been 2 months since we replaced our old 3.0 modem with this one, and we only had to reboot twice in that span. What I like is each time when we noticed a slowdown in download/upload, the Arris would show a different color light on the corresponding stream, so there is an accurate indication system.

    (0) (0)
  4. Rated 4 out of 5

    George R. – February 2, 2016

    Very easy self-installation when I added internet to my Comcast account. Basically you just hook it up to the cable and router, although depending on the type of router you may have to tweak its settings so that it correctly assigns local IP addresses to your various devices. Comcast makes you order a self-installation kit for $10-$20, which contains just a generic Ethernet cable and standard coax cable. They don’t tell you what is in the kit, and you don’t have the option of not paying for it. Ripoff.

    (0) (0)
  5. Rated 4 out of 5

    CJ – February 22, 2017

    Bought the same model modem I had which burned out due to an issue with the Comcast splitter in my home — it got wet, the modem tried and tried and tried and finally died — it gave up on connecting to the internet. Never an issue till that accident, and no issues since installing the replacement.

    (0) (0)

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Arris CM820A DOCSIS 3.0 Cable Modem

Rated 4.45 out of 5
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