11.4. Path Selection for Diversity
Multiple optical connections are often set up between the same end points, for example, working and protection connections (see Chapter 8). An important constraint on these connections is that they must be diversely routed. In particular, they may have to be routed over paths that are link diverse, that is, which do not share any common link, or node diverse, that is, which do not share any common node. Note that node diversity is a stronger criterion, and it also implies link diversity.
When multiple physical and electronic levels are considered, ensuring link diversity is complicated by the possibility of two paths being diverse at one layer but not at another. Different types of link and node diversity requirements ...
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