The thing that doesn't make sense to me in all of this is that SONET
is supposed to be built as RINGS. With a Service side and a Protect side
to each switch.
The story that I have heard is that some providers have 1 (one)
protect circuit to cover many primary circuits... You loose too
many primary and limit number of protect circuits can't get them
--firstname.lastname@example.org (Andrew Partan)