Connect your purchased modem at home using the instructions provided by the manufacturer. You will need an additional cable connection for your new, purchased modem. If you do not already have an additional cable connection, buy a two-way, 5-1000MHz coaxial cable splitter and two pieces of coaxial cable with connectors.
Remove the existing cable connection from the back of the eMTA, and connect it to the Input connection on the splitter.
Connect one end of the first new coaxial cable to one of the splitter Outputs, and connect the other end of that same cable to the eMTA.
Connect one end of the second new coaxial cable to the other splitter Output, and connect the other end of that same cable to the modem.
Locate the Cable Modem ID (MAC address) for your new modem, usually found on the bottom of the modem.
Call TWC or Chat with an agent to activate your new modem: