ARRIS CM820A Cable Modem

The ARRIS CM820A Cable Modem is a touchstone DOCSIS 3.0 cable modem that comes eight times faster network range. This delivers the wifi network connection through the Ethernet connection that can be specially used for either a single computer, Laptop, and home or small office local area network. It operates with DOCSIS 3.0 and Euro-DOCSIS 3.0.
Arris cm820a speed is much faster in comparison to others. This Touchstone DOCSIS 3.0 8×4 Cable Modem CM820 delivers (eight times faster) ultra-high-speed from dialup and ISDN service.

The ARRIS CM820A Modem DOCSIS 3.0 is the latest version compatible device that is almost compatible with any DOCSIS 2.0 or 1. Ordinally, this networking device is best for homes and businesses which is designed for the most data access desired advanced users. I also use new IPv6 technology which helps the CM820 enable the home or small business user to fulfill a higher network accessing needs with reliable speed and performance that is delivered only in the 8×4 bonded channel.

ARRIS CM820A Cable Modem Docsis 3.0 Installation

The ARRIS CM820A comes along with industry-leading reliability that provides a network speed greater than 300Mbps. If you want to use this firstly complete its installation process by using the below steps.

(i) Unboxing the Arris cm820a Comcast cable modem

Before beginning its installation firstly you have to make sure your new cable modem packaging box contains the following necessary accessories. If anything is missing then you can replace it. Unbox it and take all the item like:

  • Arris cm820a DOCSIS 3.0 cable modem
  • Power Cord
  • Arris cm820a manual
  • Quick Installation Guide
  • Wall-Mounting hardware accessories (two drywall anchors or wood screws) and its mounting instructions guide
  • Ethernet Cable, Coax Cable
  • The end-user warranty card with License Agreement
(ii) ARRIS CM820A Configuration and connecting

Now, choose an optimal and ventilated location in your home and office for your new ARRIS cable modem placement. After that, follow the steps below for installing it properly.

  • Place your CM820A cable modem according to the manual description location.
  • Now, you should put this modem and by using a power cord turn on its power.
  • Firstly, press the power cord connector button which is given on the back panel of the modem, press it, and then wait for a little bit.
  • Also, connect the Ethernet cable or coax cable in the modem ports to access the internet.
  • Attach the other endpoint of the cable with the computer’s LAN port.
  • Afterward, power on your CM820A cable mode by pressing on the ON/OFF button which is also given on the modem’s back panel.
  • Now, look at this modem gateway its LED light will be blinking the light.
  • Thus, you can open your computer and check your device network status.
  • Eventually, it’s altogether ready to connect your several wifi-enabled devices.

So, these are some steps for the ARRIS CM820A Docsis 3.0 Installation which is given above.

Arris cm820a Docsis 3.0 cable modem login

Before accessing the Arris cm820a setup page firstly, activate its login account. For the ARRIS CM820A login, follow the below-given steps.

  • Open your PC and open a web searching applications such as Google Chrome, browser, Firefox, Mini Opera, or Internet explorer.
  • Then, enter your Arris modem default IP address or in the URL and still wait for a little bit because the login page is loading now.
  • Now, the CM820 login box is open on your PC web browser page, just enter the CM820 default username– admin and also type in another field Arris cm820 default password.
  • At last, click on the next option and after that also click on the “login” option.

Thus, the Arris cm820a Docsis 3.0 cable modem login process is altogether completing now properly.

Arris cm820a Docsis 3.0 cable Modem Manual

The Arris cm820a manual may have a lot of basic Arris cm820a specs to use by its users. Get more product-relevant query answers like How to use the Arris cm820a? How to connect the Arris cm820a?  Change the Arris cm820a cable modem settings? How to use the cm820a cable modem in windows 10? Update the Arris cm820a firmware? How to reset the Arris cm820a? How to resolve the Arris cm820a DOCSIS 3.0 cable modem various problems? Why do the Arris cm820a lights blink? How to change the arris cm820a modem password? Thus, you can get all these types of queries answered from the manual. You can also get more information from the Arris cm820a spectrum. If you can’t understand any information then follow the instructions given here.

ARRIS CM820A Cable Modem Setup

The ARRIS CM820A setup helps change your modem settings. Below are some steps for the Arris cm820a modem setup.

  • Firstly, access the web login page using
  • After that, complete the Arris modem login process and then tap the enter key to go to the next page.
  • Now, the Arris CM820a setup page is visible on the web page screen automatically after completing the login.
  • Tap on the settings< administrating settings.
  • Now, under the administration settings, you have to change your wireless setting, modem setting, web settings (like IP address settings, etc.).
  • So, click on those settings which you want to change.
  • After that, by following on-screen instructions, change your DOCSIS 3.0 cable modem settings.
  • After making all changes finally click on the “save changes” option.

Thus, the ARRIS CM820A Cable Modem Setup process is now altogether finished properly. So, try to change your device settings by following these above steps.

Arris cm820a troubleshooting

Here are some steps for the Arris CM820A modem troubleshooting which are given below.

  • Sometimes, the Arris CM820 IP Address Not Working because your modem network is too slow or weak. If you want to access your device’s IP address then first you have to solve your network connectivity issues.
  • The Arris modem is working but the LED light has not blinked, then you have to reset the all-wired connection of your modem and then again check it.
  • If the Arris CM820A is not working, then reboot it and again start its power and use it accordingly.
  • Many times, the Arris DOCSISall-wired 3.0 cable modem won’t connect to the internet, so you should check its networking wires and also check if it is working well or not.
  • To resolve the Arris CM820 slow network connection then keep your modem in another location and then again check your device network status.

So, these are some Arris CM820 troubleshooting steps that are given above with its solution.

ARRIS CM820A firmware update

If you want to update your Arris CM820 DOCSIS 3.0 cable modem, then follow the below steps.

  • Using your PC web browser, search
  • After that, directly go into your modem setup page and choose the “system update” and under it click on the ARRIS CM820A firmware update option.
  • Then, update the ARRIS CM820A firmware with the new version.
  • By following the on-screen instructions, update it.
  • Now, wait for a few seconds. The updating process is running.

Finally, the ARRIS CM820A firmware update process is finished now properly. Now, this process is more helpful for getting the ARRIS CM820A max speed.

ARRIS CM820A cable modem reset

Below are some steps for the ARRIS CM820A reset. Follow these steps to reset your device.

  1. Firstly, find the Arris reset button which is given on the back panel of the modem closer or near to the Ethernet port.
  2. After finding it, simply press the reset button by using a pin and hold the Arris DOCSIS 3.0 cable modem reset button just for 10 to 15 seconds.
  3. Thus, hold it and watch your modem LED lights.
  4. It reset now properly, now turn on your device again and look on the arris cm820 us light blinking
  5. Finally, the CM820A cable modem reset process is finished now.

ARRIS CM820A DOCSIS 3.0 cable modem review

I have used the Arris CM820A cable modem for many years. This is a very perfect and greatest Comcast. It is an amazing DOCSIS 3.0 cable modem. I am getting an 8×4 faster network right now on my various devices. This is a very great 8×4 bonding DOCSIS 3.0 modem that will connect more than devices easily. If you are also looking at this type of device then purchase it. I also purchased it from Amazon. I purchased it after seeing the Arris CM820A reviews. There are many numbers of Arris CM820A refurbished versions available. So, I am very happy to be using this cable modem.

Also Read


How to use the Arris cm820a?

You can use the Arris DOCSIS 3.0 cm820a cable modem by using the coax cable and Ethernet cable which is helpful to receive the faster network.

How to connect the Arris cm820a?

By attaching the Ethernet cable with your Arris CM820A Comcast cable modem LAN port and another endpoint with your computer LAN port you can easily connect a network connection.

How to change the Arris cm820a cable modem settings?

If you want to change your cable modem settings then just simply using your computer web setting page then change it accordingly.

How to use the Arris cm820a cable modem in windows 10?

Just install the Arris CM820A modem driver to use it into window 10 then use it.

How to update the Arris cm820a firmware?

By following the on-screen instructions of the settings menu you can easily update it.

How to reset the Arris cm820a?

Hold and press the reset button of the modem and turn on it again now your Arris cm820a factory default setting is reset now.

How to resolve the Arris cm820a DOCSIS 3.0 cable modem various problems?

Just, read the Arris cm820a DOCSIS cable modem specs and instructions to solve your modem’s various issues.

Why do the Arris cm820a lights blink?

This is blinking all-wired to show your device network status. It blinks various lights like red, blue, and green color light.