Whether you subscribe to Mediacom Online or another of Mediacom's Internet packages, such as Mediacom Online MAX or Mediacom VIP, you can install your own modem to avoid the cost and time of professional installation. The installation doesn't require opening your computer case, so you don't need any specialized technical expertise. If you can't get your self-installed Internet to work, call Mediacom for assistance.
Unplug the coaxial cable from your television and connect it to the input on the splitter from your installation kit. Connect a new coaxial cable from one of the splitter's outputs and reconnect your TV. If you have a second coaxial port in your wall or don't use cable TV, skip this step.
Plug a coaxial cable into the remaining output on the splitter (or an empty port in your wall). Connect the other end of the cable to your cable modem.
Connect the Ethernet cable to the Ethernet port on the modem. Plug the other end into the matching port on your computer. Alternatively, use the USB cable to connect the USB port on the modem to one on your computer.
Plug the power adapter into an outlet and connect it to the modem.
Open a Web browser on your computer which should automatically take you to Mediacom's registration site. If it doesn't, your modem may not have finished turning on. Wait a few minutes and try reopening your browser. If it still doesn't work, you can manually reach the site by entering "walledgarden.mchsd.com" in the address bar.
Enter your account information on the registration site to finish setting up your Internet connection. You'll need the account number on your bill, which starts with "8383," and your registration code -- usually the last nine digits of your account number. You may also need your modem's MAC address, which you can find on a sticker attached to the modem.
Most coaxial cables use a screw-on connector. Do not forcibly pull out a cable without unscrewing it first.
If you have a router, used for connecting multiple computers to the Internet, connect an Ethernet cable from the modem to the router. Connect additional Ethernet cables from the router's output ports to all your computers.
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