Each week this season, a group of three replay officials huddle in a locked room at Big Ten headquarters in Rosemont, Illinois. No one is allowed in or out of the room while they monitor one or two games involving Big Ten teams.
Those replay officials are given video feeds of the game but no sound, and their job is to make decisions on which calls made on the field should or should not be overturned. And then to file those decisions away for future research.
The Big Ten is studying, but not using, a centralized replay system, as the ACC and SEC switched to this season.