Oh my god, these are terminal connections.
In the late eighties, - before the PS/2 port existed because also before the PS/2 existed -- IBM Model M keyboards had metal-shrouded RJ-45 connectors that connected to terminals-as-in-dumb-terminals, like the IBM 3101. For a while you could buy adapters that would let you plug the RJ-45 models into PS/2 connectors, but all that's long gone.
These are 40-year-old keyboard and data ports.
@mhoye but why in a room?
This is such a great beginning for a text adventure if you ask meβ¦