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Scenario with Sonet/SDH
Scenario 1 and 2:

LMP Network <--------- non-LMP Sub-Network ---------> LMP Network
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SONET/SDH Net <------> SONET/SDH Sub-Net <-------> SONET/SDH Net
Edge Node(X) Node(1) ---- Node(N) Edge Node(Y)
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| <--------LMP--------> EMS <--------LMP--------> |
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<------------------------ LMP ------------------------>

Scenario 3:

LMP Network <----------- LMP Sub-Network -----------> LMP Network
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SONET/SDH Net <-----> SONET/SDH Sub-Network <-----> SONET/SDH Net
Edge Node(X) Node(1) -------- Node(N) Edge Node(Y)
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EMS1 <----LMP----- <----LMP----> ----LMP----> EMS2