---
product_id: 377234294
title: "ARRIS CM820A Cable Modem DOCSIS 3.0 (Latest Version - 1 Step Activation)"
brand: "arris"
price: "€ 94.84"
currency: EUR
in_stock: true
reviews_count: 5
category: "Arris"
url: https://www.desertcart.be/products/377234294-arris-cm820a-cable-modem-docsis-3-0-latest-version-1
store_origin: BE
region: Belgium
---

# 300 Mbps max data transfer rate 8x4 channel bonding for blazing speeds Built-in MoCA immunity filter for stable connection ARRIS CM820A Cable Modem DOCSIS 3.0 (Latest Version - 1 Step Activation)

**Brand:** arris
**Price:** € 94.84
**Availability:** ✅ In Stock

## Summary

> 🚀 Unlock lightning-fast, hassle-free internet — because buffering is so last decade!

## Quick Answers

- **What is this?** ARRIS CM820A Cable Modem DOCSIS 3.0 (Latest Version - 1 Step Activation) by arris
- **How much does it cost?** € 94.84 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/377234294-arris-cm820a-cable-modem-docsis-3-0-latest-version-1)

## Best For

- arris enthusiasts

## Why This Product

- Trusted arris brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Rock-Solid Stability:** Built-in MoCA immunity filter and dual 96MHz tuners ensure interference-free, consistent performance.
- • **Compact & Sleek Design:** Minimalist black finish fits effortlessly into any professional workspace or home setup.
- • **Future-Proof IPv6 Ready:** Stay ahead with full support for the latest internet protocols, perfect for modern smart homes and offices.
- • **Blazing 8x4 Channel Bonding:** Experience ultra-fast, reliable internet with 8 downstream and 4 upstream bonded channels.
- • **Seamless Plug & Play Activation:** One-step activation means you’re online faster—no tech headaches, just pure productivity.

## Overview

The ARRIS CM820A Cable Modem leverages DOCSIS 3.0 technology with 8x4 channel bonding to deliver up to 300 Mbps download and upload speeds. Featuring built-in MoCA immunity filters and dual 96MHz RF tuners, it ensures a stable, interference-resistant connection. Designed for easy one-step activation and full IPv6 support, this sleek black modem is ideal for professionals and small businesses seeking reliable, high-speed wired internet access.

## Description

The Touchstone DOCSIS 3.0 8x4 Cable Modem CM820 delivers ultra-high speed data access to cable service subscribers’ homes and businesses. Designed to support the services desired most by advanced users, including full support for new IPv6 services, the CM820 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 CM820, cable operators can offer data services at speeds greater than 300Mbps to their subscribers to compete against VDSL and fiber to the home threats. The CM820 enables Cable Operators to support businesses with Ethernet Services over DOCSIS using the Cablelabs BSoD implementation and provides competitive high capacity commercial services to businesses.

Review: Refurbished Modem, Different Part No. - 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.
Review: Works Great; I'm not a Tech-Savvy Person - 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.

## Features

- 8x4 bonded downstream/upstream channel for superior throughput
- Built in MoCA® immunity filter
- Two independent 96MHz wide RF tuners to receive downstream channels up to 1GHz
- Meet or exceed industry radiated immunity and surge requirements
- Please check with your Internet Service Provider for compatibility in your home or office.Flexible NxM downstream/upstream channel bonding for superior throughput

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B008GG78FU |
| Brand | ARRIS |
| Color | Black |
| Colour | Black |
| Compatible Devices | Personal Computer |
| Compatible devices | Personal Computer |
| Connectivity Technology | Wired |
| Connectivity technology | Wired |
| Customer Reviews | 4.1 out of 5 stars 735 Reviews |
| Data Transfer Rate | 300 Megabits Per Second |
| Internet Service Provider | xfinity |
| Internet service provider | xfinity |
| Item Weight | 0.01 Ounces |
| Manufacturer | ARRIS |
| Maximum Downstream Data Transfer Rate | 300 Megabits Per Second |
| Maximum Upstream Data Transfer Rate | 300 Megabits Per Second |
| Mfr Part Number | FBA_P-10-20521 |
| Model Number | FBA_P-10-20521 |
| Modem Type | Cable |
| Number of Ethernet Ports | 2 |
| Number of Ports | 2 |
| Number of ports | 2 |
| UPC | 726947110717 |
| Unit Count | 1.0 Count |

## Product Details

- **Brand:** ARRIS
- **Internet service provider:** xfinity
- **Connectivity technology:** Wired
- **Compatible devices:** Personal Computer
- **Colour:** Black

## Images

![ARRIS CM820A Cable Modem DOCSIS 3.0 (Latest Version - 1 Step Activation) - Image 1](https://m.media-amazon.com/images/I/518+QY1-JbL.jpg)

## Customer Reviews

### ⭐ Refurbished Modem, Different Part No.
*by C***. on 22 February 2025*

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.

### ⭐⭐⭐⭐⭐ Works Great; I'm not a Tech-Savvy Person
*by F***L on 5 April 2022*

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.

### ⭐⭐⭐⭐⭐ Great performance on Comcast (Blast tier)
*by M***. on 12 March 2016*

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.

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*Product available on Desertcart Belgium*
*Store origin: BE*
*Last updated: 2026-08-04*