CTR, TSO C145/146 is WAAS. As part of the TSO is Fault Detection and Exclusion. This is the bit AirServices is interested in. The NUC (or is it NIC) gives an integrity signal that it is using good data. Good data means integrity of the position, therefore maintain the separation standard.
My post on the C129 gear was prior to hearing of a rumour. Three ground station uplinks are being installed in Perth Brisbane and Melbourne...pointing at the MTSAT...now why would that be happening?