kyhwana2: Because the AU-NZ cable was down, so AU-NZ traffic over SXC was going NZ-hawaii-fiji-AU..
The cable wasn't down. It looks like they lost one wavelength on the SYD-AKL leg. Vocus and 3 other customers were using that wavelength. No idea who the other customers are, but either they're not making any noise, or they had capacity on other wavelengths which weren't affected.
ahh gotcha, so they were only upgrading gear that Vocus/etc were using and no one else? (Going off latency alone, i'd say KAREN was one of the customers that brought protected capacity)
well i think protected capacity is common, but it shouldn't have to go to the other side of the world unnecessarily? can't there just be redundant waves straight to australia? or was there but not enough to move over?
mercutio: well i think protected capacity is common, but it shouldn't have to go to the other side of the world unnecessarily? can't there just be redundant waves straight to australia? or was there but not enough to move over?
No, the idea of 'protection' is to cover the entire cable segment going down. If the SYD-AKL leg fails, the protection would go via Hawaii (see the map posted earlier).
Pacific Fibre doesn't need protection, the whole idea is you buy capacity on both pacfibre and southern cross.
Southern Cross was built at a time when there were no modern cables connecting sydney to the USA, so they built a figure8 cable to provide redundancy. That isn't needed for cables built since, as there is redundancy via the other cables.
Telstra didn't bother with cable redundancy for Endeavour to Hawaii, Pipe didn't bother for PPC-1. AJC has a little bit of redundancy with multiple landing sites that join to a single cable in deep water - since most cable-cutting accidents happen in shallow water.