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Your cart is empty.The Touchstone DOCSIS 3.0 8x4 Cable Modem CM820A delivers ultra-high speed data access to cable service subscribers homes and businesses. Designed to support the services desired most by advanced users, the CM820A enables the home or small business user to address productivity needs with the speed and performance found only in the 8x4 bonded channel cable environment along with industry-leading ARRIS reliability. With the CM820A, cable operators can offer data services at speeds greater than 300Mbps to their subscribers to compete against VDSL and fiber to the home threats, as well as provide a platform to deliver competitive high capacity commercial services to businesses.
funnygirl
2025-09-03 10:35:38
I bought this modem back in March 2020. It's now April 2022. We use a local cable internet provider (Service Electric). Our previous cable modem pooped out in March 2020. It probably caught COVID. Anyway, Service Electric told me I could buy a new modem with DOCSIS 3.0, and they recommended Arris brand. So, I bought this one.It arrived. I connected it. It worked. It still works. I don't know anything about internet speeds, up and down channeling, ping speed, etc., and I don't care.We are a homeschool family and use internet for things like email, online lessons, streaming videos, YouTube, podcasts, audiobooks, and paying bills. Our four kids don't have any screen devices. My husband and I don't let them touch our phones. We don't watch TV because we're old-school and do things like go on walks, read books out loud, eat meals together, play games, do chores, and do projects.We're also cheap, so we have a basic 25 mbps plan, or something low like that.Internet: When I type a web address into the address bar, the webpage comes right up. That's all I need. This modem never asks anything of me. When we lose power and the power returns, this modem turns right back on. This modem works constantly behind the scenes, never complaining, never asking for anything. It just keeps giving and giving, like Shel Silverstein's Giving Tree.Therefore, this modem gets 5 stars.
Mark B.
2025-08-01 11:21:39
It's not beautiful by any means but the performance more than makes up for it. Using it with Comcast Cable in March of 2016.The 802A is actually the retail model of this device and is on Comcast's approved equipment list while this 802 was meant to be distributed by cable providers and is not on the list. However, it will work and was easy to set up.When you call Comcast to activate the equipment just tell them it is the 802A and give them the seriel number on the device and Comcast will be none the wiser (it shouldn't matter anyway, but better to play it safe).Took about 10 minutes on the phone to get it activated.Provides stable performance and is better than the equipment Comcast provides these days.Buying your own modem will save you $10 a month on the equipment rental, paying for itself in just a few months.I have Blast speed from Comcast and actually get better than advertised speeds with this device (90 Mbps down and 15 Mbps up).Make sure you have your own wireless router if you want to set up a wireless home network, as this device is just a simple cable modem and not a cable modem/wireless gateway like the equipment you likely have from Comcast right now.
Fallin
2025-07-04 11:55:16
Bought the Modem to replace the fees and upgrade from an old Thompson Modem. I did the self install: Connected the modem and the router all at once with a wired connection to the laptop as well. After it booted up, then said it need some activation, so i logged (open the browser and the page got redirected by itself to comcast self installation page) in to comcast and put in my information (e.g. account number and phone number). It then showed the changes that were going to happen switching: from an older modem to a new one. It cycled (e.g. rebooted) and then it asked to leave it alone for 5 minutes while it downloaded updates. I did that and then gave both modem and router a reboot. It connected perfectly and didn't have to call comcast. :)
Daniel Salmon
2025-01-23 15:42:02
This modem is listed as fully supported by Comcast Xfinity and provides the speeds as advertised, most of the time. However, it randomly loses connectivity to the internet and only recovers after a full power cycle. After troubleshooting with the manufacturer, and they did a great job, it was determined it was faulty. Upon their further review and offer to replace the modem they said they could not ship a replacement as this was not covered under their warranty because it was purchased through a third party that is not an authorized reseller (not Amazon but the seller). Be careful, I bought it because of all the great reviews but my experience was very different.As a note, this was actually the second modem of this model I purchased because the first one I bought was a complete out of box failure. After 1.5 hours trying to get it to initialize on the Xfinity network, we determined the Ethernet port was bad.On to a different manufacturer and seller...I will make sure to get a warranty this time.
Cynthia R.
2025-01-21 12:45:20
Arris sent me an old refurbished modem with a different part no. I returned it because it was not what I ordered.I am a very unhappy customer.Waste of time.
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