To add further information.
Each FCC has one, two, or three sources for the necessary data. The FCC must select which source has the best data. To do this, the FCCs use a special source selection procedure. Where there are three sources available, the data from each sensor is available to each FCC. Each sensor has an onside connection (left sensor to left FCC, etc.). This is the local sensor data for that FCC. Each FCC also gets data from the other sensors of the same type through the FCC cross-channel data buses.