That’s cool. When I was at university in York the TV station was run over what I believe was an old Redifusion network on the campus. You could see some of the channel selection switches on the walls. While I was there a couple of the more talented electronics engineers designed a a new bit of kit that repurposed the cabling with their own home-grown kit, replacing all the old stuff. It was the first time I’d encountered the concept of balanced line transmission. I think that each of the twisted pairs was a seperate channel, but I’m quite rusty on the details.