The DirecTV tech came yesterday.
I had a system that used a legacy LNB, ran all 4 coaxes to a box mounted outside. From this box, the two Coax ran inside to 2-8 way SWM splitters. The system wes powered by a 28 volt PI. At the time, I had a Genie. three DVR's and a receiver, all requiring 12 lines. One of the 103 connectors was badly corroded and barely making up.
The tech said that was all outdated. He removed the LNB and replaced it with a SWM LNB. Now I have 9 lines running off one SWM LNB, still powered by the 28 volt PI. which I thought wouldn't work, before, but it is working fine. Don't know what's changed to allow 9 lines to work off one splitter.
