Question about factory sat prep on Landmark

[sknoch]

We have a 2016 Landmark Charleston with factory sat prep. I got on the roof the other day and cut the hole in the appropriate location for the wires. In there they had the two cable lines, the Winegard control cable and another wire that is purple and white. I have no idea what the purple and white wire is for.

Anyone know what this wire is used for? I have installed this dish before and never needed this wore, but this is my first with factory prep.

Any help is appreciated.

Thanks,
Shawn