The claim (by Bell) is that a "third-party fibre line" way up in North Bend BC was the root cause of this problem..
I know providers all stick their own gear on the same towers, but I guess I didn't realize how common it was for the top-level providers (i.e. the ILECs) to lease cables (as opposed to running their own). I always assumed this was just the resellers (CLECs) who did it..
I wonder if that cable is fully third-party owned, or belongs to TELUS (the quad-play provider for western Canada) and Bell/Rogers lease capacity from them for their wireless services.