Set Up Your Wireless Gateway and Connect Your Wireless Network

For best WiFi coverage, try to place your wireless gateway close to where you most frequently use your WiFi-capable devices. For best WiFi reception and minimal interference, place your wireless gateway in an open area away from items such as exterior walls, metal surfaces, microwaves and windows. Once you’ve ensured the Comcast wireless gateway is in the best location in your home, it’s time to plug it in and power it up.

Note: If you are replacing a modem currently connected in your home, be sure to unplug that device from the cable or coaxial outlet and plug the new modem into that same outlet. If you do not have an existing modem set up, simply plug your new modem into the main cable or coaxial outlet in your home.


Once you set up your network, you can wirelessly access the Internet and other XFINITY services from your computer, laptop, game system and more. Your wireless gateway or wireless router makes it easy to set up your network and adjust your settings. Before you begin, you can find out more information about wireless networking at What is Home Networking?, or you can find out how to set up a wireless network with these simple steps.

These steps are specific to customers with the following equipment:
  • Wireless Gateway 1 (model numbers TG852G, TG862G, SMCD3DNV, or TC8305C)
  • Wireless Gateway 2 (model number DPC3939)
  • Wireless Gateway 3 (model numbers DPC3941T and TC8717)
  • Other routers may have some variations

Connect Your Wireless Gateway

Before you can access XFINITY services or the Internet through your wireless gateway, you'll need to make sure it's properly connected. Please check that:
  1. Your wireless gateway is connected to the Internet through the Cable connector on the back panel with a coaxial cable.
    Back panel of a wireless gateway.  Options are listed below.
Wireless gateway back panel features are:
  • Reset button for resetting the wireless gateway
  • USB host connector [for future use]
  • Tel1 connector for analog phone line
  • Tel2 connector for analog phone line
  • Gigabit Ethernet (1-4) connectors for use with a computer LAN port
  • Cable connector for the coaxial cable
  • Power connector for the power cord
  1. Your wireless gateway is plugged into a power source through the Power connector with the provided power cord.
  2. The Power, US/DS, and Online LED indicators on the front panel are steadily lit. This may take several minutes after plugging in your wireless gateway.
    Wireless gateway - front of device, displaying LED lights (and other indicators).
Now you are ready to activate your Comcast services and your wireless gateway. See How to Activate Your Wireless Gateway for more information.

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