DWDM Metro Access Design

[a.harrowell at gmail.com (Alexander Harrowell)]

What's the constraint that rules out using SONET or something similar, which is 
designed to give you a robust ring topology? I think it's probably quite 
important to know whether that's really, absolutely out of the question, or 
whether it's a possibility to relax that in favour of a less painful higher 
layer solution.

-- 
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