We recently discovered during our installation, that the NC1 I/O and the Mini SDI do not support video formats that are non-drop-frame, such as 1080p60 or 1080p30.
We should have read the specifications more closely, and based our expectations on our previous experience with the 400 series and the 800/8000 series TriCasters.

We will be buying converters to take signals from devices that do not support drop-frame, which adds a few hundred per signal to our build. Not ideal, but at least there's a solution.