Sunday 29th January
There was a power outage that appears to have affected power to Caius and also to the CUDN router, ROUTE NORTH, at Trinity. Power was lost at around 18:30 and returned at around 01:40. The router stayed up until around 21:30 when its UPS was exhausted.
Caius was affected for longer because there is some active kit (a media converter) at the GBN cabinet to convert between single-mode fibre and the college multi-mode fibre. That kit is not protected with a UPS and so was out for the entire period and so you will have lost your connection for that period.