Originally Posted by dmkw
Neither the office or the TV room have Ethernet. I know that the office will require an adapter as there is a wired only PC in there which I want to connect to the internet. What I can't figure out is at what point does the first adapter need to connect to the coax cable? Everything in the diagram is in the basement, then the coax cables go out to the locations in the house.
If I understand it correctly the modem and router are in the basement along with those splitters?
Set it up in the basement, ethernet off the router into the moca adapter, which connects to the inside side of any splitter.
Though from the images, it doesn't appear any of your splitters are powered, so you can connect as in the diagram above. "To cable outlet" is the cable currently going into the cable modem. Once that's working, the roamios and other adapters should see and be able to join that moca network.
Don't forget the POE filter, above the first splitter in your first diagram.