Still no go followed yours to the letter. Very weird.
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My setup is very similar to the diagram posted that you're referring to. And I've got the Asus XT8 nodes connected with Ethernet backhaul as pictured and discussed as well. It works; the node shows the backhaul is Ethernet.
But I've found the Asus Android mobile app cannot be used to connect Ethernet by default. First thing I did was reset the node and pair again per the quick Guide instructions with router node again but the close pairing step with a single short external Ethernet cable from router LAN to WAN of node. But the web portal has a priority mode that can be set to favor Ethernet first so Ethernet backhaul is possible without the reset and pairing that I did. Be careful with the Asus mobile app, I'd suggest using only the web portal to setup 5G-2. I've discovered that the mobile app can default the backhaul to radio rather than Ethernet. When and if that happens, go-to the web portal and prioritize the backhaul as wired Ethernet again.
Not sure what may be going wrong with your MoCa adapters but I will note that any splitter may not work as expected. You need one that is compliant with MoCa frequency passband; most cable broadband ISP splitters are compatible but a splitter purchased off the shelf may not include the frequency passband needed for cable broadband and MoCa. You can find MoCa splitters for purchase, likely where you found your MoCa adapters. These splitters are likely not in a MoCa kit unless described as such. I purchased mine separately.
If you suspect the splitter, look closely for passband and compare to your MoCa adapters. They should both indicate compatibility in frequency passed; the splitter may even be a wider passband then the MoCa adapter.
And where you say you have coax coming from the wall, the other end should be connected to the common MoCa splitter with compatible frequency passband. Your cable broadband can share that same common splitter and cable TV can even split off the cable from wall to cable TV boxes. Cable TV is an option, not necessarily needed. But even cable TV can be compatible with MoCa and share the same coax cable.
Picture the common splitter this way, if you have cable broadband. The cable from ISP would come in to that MoCa filter, then common splitter at your ISP service location. The other ends feed the coax in walls and rooms that are connected for service. "From walls" is where the other ends go to your MoCa adapters. If you have cable TV box and modem at same location, you may need an extra splitter to feed both coming off the MoCa adapter. If you have TV locations with cable TV from your broadband ISP, the other rooms without the modem can use the other coax to feed the cable TV box. This may reduce the number of splitters needed.
Read your MoCa adapter installation instructions to make sure you're using the right coaxial connections on the MoCa adapter.
Apologies if the generalization of this post was already understood. I covered all the possible loose ends imagined. Best wishes for success. My network is similar but I've got 3 MoCa adapters but no cable TV, just cable broadband and MoCa combined.
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