Those are the swim splitters for also Whole home DVR and Cinema connection kit for Internet over coax. In my case I have 2 of them too.
This is my setup.
- I have a Swm16 outside and one 4 way splitter outside.
- Now from the SWM16 I have one leg to the outside splitter and one leg to the 3rd floor 4 way splitter.
- Now From my outside Splitter I feed Living room TV, and 3rd floor Bedroom TV, That's it on that Splitter! ( so I have a power inserter slot free and one open room feed left)
- Now upstairs at my 2nd splitter , Its full. I have my power inserter, plugged in to 4 way splitter , Master Bedroom, and 3rd Bedroom, and my Cinema connection kit.
This is a 9 tuner setup Whole Home DVR with VOD all through the house.
Now if I wanted to swap my 2 H25s for 2 HR24 I could without adding anymore connections or splitters, That would be 11 tuner setup.
Now I still have one open space on my downstairs splitter so If I want I could have a 13 tuner system without adding more splitters or switches.
This is One Swim 16, and 2- 4 way Directv splitters like listed in claudes picture.
I will say Dish has the edge on function of the receivers, But not when it comes to switches cabling and making it work, Directv has that one in the bag.