Not sure how yours is set up. On our 3121, I ran a new designated satellite inlet in the electrical bay, then up through a cabinet where the box sat. If I remember right, you can't use the park cable inlet since it runs to the cable connection with the antenna signal booster. I don't have any pictures with me since I'm at work, but there is a way to utilize that line by bypassing the booster. Check out this link for one way of making it work:
RV Satellite Cable Receptacle Rewiring | ModMyRV
On previous units, I've run a designated line if it didn't already have one, then run the satellite box output into the park cable line so you have Dish or DirecTV on all of the TV's in the coach. Hope some of this helps.