On Thu, Sep 6, 2012 at 2:12 PM, Will Orton <will at loopfree.net> wrote: > . I suppose they were all built > directly on the fiber (maybe with WDM but no layer1.5-2 muxing) and the > provider was always the one who handled protection switching? or protection at the optical layer isn't as predictable for all aspects as L3 'protection' is... or something.