Good old System X
Whilst at college doing my ONC, HNC, and C&G, we had a couple of days where job recruiters visited and gave an insight as to what to expect in the real world. I remember the two guys who told us mere college plebs that none of us had what it took to work in the telecoms world. They outlined System X as being far too complex for us to understand.
We politely told them to get knotted and given the anger in the room our lecturer actually asked them to leave. The bit about ‘we’re wasting our time with you’ particularly annoyed our lecturer and us.
Nearly 40 years on I am still working in the telecoms sector - never having worked for BT but having connected to many a system X exchange in the various roles I’ve had.
Many a late night and overnighters all as part of the customer service vibe.
Best system restart was a PABX where two sites had similar naming conventions. The remote restart at 2am restarted the wrong one. Luckily no one realised as traffic was low.