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!
Beth –
I was told by Comcast to replace my outdated modem (that I owned.)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Now I am finally enjoying the internet speed and strength that I have been paying for, and not receiving with the old, outdated modem.
Mr. Cheap Skate –
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.
Samwise –
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.
George R. –
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.
CJ –
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.