I live in an older house that has some in-wall cabling the previous residents installed. The plate here says ISDN, as you can see, but the ports are RJ-45 and ethernet "works" over it, albeit at 100 Mbps. I assumed it was CAT 5 and not CAT 5e, because of these speeds.
However, it recently stopped working. So I opened it up to see what I could see and saw this:
I have some experience with ethernet and cabling but have never seen anything like this before. I have to assume it's something ISDN related, but don't know much about it. When I search for ISDN information, I mainly get results about ISP ISDN connections and nothing about this type of connector. I was able to find shops online selling this type of wall-plate and connector, but those offered no explanations as to what this is.
The cable behind it looks like a normal UTP CAT 5e cable, but I can't be completely sure myself, as I can't see enough of the cable to see any markings on it. The rest is deep in the wall.
My main question is can I re-terminate this into a normal RJ-45 CAT 5e connector? And hopefully get gigabit speeds?
Secondary question is, what is this type of connector used for? Why in the world would you want to split one perfectly good UTP cable into two connectors and get reduced speeds?