The camera control unit (CCU) is typically part of a live television broadcast chain.
In outside broadcast production, these racks took up an entire section of the OB truck and were operated by a small team of skilled engineers.
Firstly, they set up the CCUs at the start of a production and ensured that the picture created was of broadcast quality.
[1] During production, it was the vision engineers' job to operate the CCUs and control both the exposure and the colour balance.
For more complex productions, preset scene files can be recalled to quickly change the settings of the camera on the fly.