To set up your MoCA network you would need a POE (point of entry) filter and 2 MoCA adapters. I have linked to a couple of examples below but they all work about the same.
When I had a MoCA network the POE filter was installed inline right where the coax entered the house and right before the modem. Install the first MoCA adapter near the router. Connect it to the coax that runs to your media room. In the media room, install the 2nd MoCA adapter. From there, you can connect your devices, using a switch if you need multiple ethernet connections.
Main incoming coax---> POE filter---> splitter---> Leg 1 and Leg 2:
P.S. Do not want to use a powerline network adapter as they didn’t work for crap in a buddy’s house.
I have had great success with Powerline adapters, and the ones I use are five years old. Their performance is dependent on which circuits they are "plugged" into. Same circuit? Great performance. Same phase? Good performance. Opposite phase? Mediocre performance.
I get north of 50 Mbps between two powerline adapters that are on opposite phases two floors apart in my home. YMMV.
That's a lot of splitters...especially the path to the modem. Do you ever have internet slowdowns or drops? Maybe your signal levels are strong enough so it's not an issue, but generally you'd want the modem to be off the first split.
Having said that, in your current setup:
Having said all of this...I tend to agree that powerline adapters are more cost effective and way less complicated.
I sent you a DM but essentially you'd probably need to replace that upper splitter with a 3 way splitter to connect the modem, cable box, and moca adapter. Ideally the modem shouldn't be behind that many splits but if signal is strong then there's nothing wrong with it. Put the modem on the output with the least amount of signal loss. Then the lower splitter feed to the media room would need another splitter, one leg to the cable box and one to the moca adapter.
Some moca adapters have multiple ethernet outputs and some only have one. If yours only has one, then just connect to a switch then connect your devices to the switch.
P.S. I’d consider the powerline option but the 2 plugs I would have to utilize are on the opposite phase in the square D box which I’ve read pretty much makes them useless?
It should be very easy to swap two adjacent breakers in the panel to put those receptacles on the same phase..
A few MoCA Adapters have two (2) coax connectors:
There is not need for a splitter with MoCA Adapter, just only for the incoming cable service line along with POE MoCA Filter.
Unless connecting both Cable Modem and Cable Box in same room, in which case a splitter is needed (must be rated 5-1675MHz to work).
Hope it works with fit.
+I for use of Powerline ethernet adapters. Just bought Tivo Mini Vox to replace first generation Tivo Mini that had died. Works fine with Powerline adapter. I tried just for giggles hooking up wireless ethernet adapter and almost worked but too much stuttering.