Do you recieve any manaul for the router. This CD consist of information that you can use to setup comcast. On the other hand Comcase to provide user guide for settings up a easy connection. Other than this there are number of user manuals provided on the official website which guides you for the entire setup process. The below link consist of supported routers and manuals that you can use for Comcast.
http://customer.comcast.com/help-and...ways-adapters/
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