CAM 3.0 is the atmospheric model component of the Community Climate System Model (CCSM), which also includes ocean, land, and sea-ice models, as well as a flux coupler.
Details on the use of CCSM may be found in the CCSM User's Guide.
Please note that the port of CAM to the CCSM does not use the supported configuration and control mechanisms (configure and build-namelist) described in this guide. However, portions of this User's Guide (e.g. CAM Namelist Variables (B)) may still be of interest to CCSM users.
More information on the CCSM can be found on its web page