What on earth is this for?
BT Access SDH Router.
BT Access SDH NTE 4U/7A Router Rack Mounting Business | eBay
Think I've seen one of these just about everywhere. Barely anything connected - just power, and an orange fibre cable which goes to a junction box on the wall (large one, roughly 10" long, 6" high and 2" deep). Going into that junction box is what looks like more fibre cable but looks a bit more like barely opaque plastic tubing.
Next to nothing going in or out, I know it's a router - but for what? Why are these still sitting in schools? In 2 cases at least I'd like to claim some rackspace back and save the power it's using for <unknown reason>
Unless it's something important, but I can't think what.