Analysis of Optical Cable Backbone Resources
An optical backbone is a complex physical system and a graph is merely a very simplified abstraction meant just to represent node adjacency. Perhaps a given graph is not feasible due to geographical obstacles, so topology diversity provides designers options to pick and choose. Starting from the (first row, first column), by adding an extra node, only one twin topology can be built (second row, first. Any twin topology will survive a single failure but its 2-GC feature can not guarantee that it will survive multiple failures.
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