Replace third party Modem with another third party modem

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@Mnunnsr wrote:

Hello, been having lots of frequent reboots on the third party modem (Netgear CM1100 Docsis 3.1).  My signals are good so I ordered another brand to eliminate or confirm that the modem is the problem.  Now I want to disconnect the old modem and connect and activate the new modem (Arris SB8200).  What are the proper steps to do this?  These modems are not Wifi Routers, just modems. 

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Connect it to the coax line and power it up. Let it fully sync up with the system ("DS, "US", and the "Online" lights are steadily lit). Connect a computer to it and open up a browser. You *may* see their "Walled Garden" modem self registration page. If so, follow the screen prompts. Have your mobile telephone number, your Xfinity username and password or the account number and telephone number associated with your Comcast account handy.

If not, try calling 1-855-652-3446. That is their device activation line.

If that doesn't work for you, you can call 1-800-comcast and tell a rep that you would like to have a new modem provisioned for service. Have the RF / CM / HFC MAC address and the serial number of it handy when you call.