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CM500 High Speed Cable Modem
4. If you do not have an Internet connection with the cable modem, ask your cable ISP to look
for your cable modem online, and do one of the following depending on what your cable ISP
tells you about your cable modem:
• If the cable modem is not visible, your cable ISP can give you instructions to verify
why the cable modem does not connect with your high-speed Internet service.
• If the cable modem is visible to your cable ISP, reboot the computer, laptop, or home
gateway that is connected to the cable modem. Try checking your online status again.
Set Up Your Internet Service with Comcast Xfinity
If Comcast Xfinity is your cable Internet provider, set up Internet service by using Comcast
Xfinity’s self-activation process. If you are unable to self-activate your modem router, call
Comcast Xfinity customer service. After you complete the setup, perform a speed test.
Use the Self-Activation Process to Set Up Your Internet Connection
Before you start the self-activation process, make sure that your account number, account
phone number, and login information (your email address or user name and password) are
nearby.
To set up your Internet connection with Comcast Xfinity’s self-activation process:
1. Close all web browsers.
2. Launch a web browser.
You are redirected to the Xfinity self-activation page. If you are not redirected to the
Xfinity self-activation page, visit
www.comcast.com/activate.
3. Provide your Xfinity credentials and complete the self-activation process.
This process might take up to 15 minutes, during which the modem router reboots a
couple times.
Call Comcast Xfinity to Set Up Your Internet Connection
If you are unable to self-activate your cable modem, call Comcast Xfinity customer service.