The all-in-one Arris SVG2482AC
This device handles voice, Internet, routing and Wi-Fi. This all-in-one type of device is commonly referred to as a gateway. The SVG2482AC is one of the highest performers of the group with 24x8 channels (down/up). This device can be activated across Comcast's entire footprint.
The all-in-one Arris TG862G
This device handles voice, Internet, routing, and Wi-Fi. This device can be activated across Comcast's entire footprint.
Those that may need better router/ Wi-Fi performance may wish to use their own router. You must disable the router/ Wi-Fi capabilities of the TG862G before you can use your own router. This is known as putting the gateway into bridge mode. Bridge mode can be accomplished by following the directions found here.
The Arris TM822G
This device handles voice and internet. It does not have a built-in router.
Before you start, make sure your account number and telephone number are readily available. This information can be found on your monthly statement or order confirmation e-mail.
If the online activation does not succeed, call customer support: 1-800-COMCAST (1-800-266-2278) or 1-800-XFINITY (1-800-934-6489)
[Updated 2/10/18 by nerdburg]