We just moved in to a house that was built in the early 90s and this is what I found in the network panel.
This had to be for analog phone service back then. Is it possible to terminate these cables with RJ45, then install a switch to get whole home Ethernet?
Provided the wiring is home ran, and not daisy chained, it should work. You'll have to double check the terminations at each wall plate jack as well, when you do crimp on RJ45s. And do yourself a favor while doing it.... Label things, for easy identification later. Will help troubleshooting down the road, and any odd connections you may think up, or add.