Synchronous Digital Hierarchy Stack
A diagram of the relationships between objects in an SDH (Synchronous Digital Hierarchy) network. This graph was created to show a multiplicity of semantic relationships in a single graph.

In the graph file, the setting of the global page size, graph layout size, aspect ratio (to fill the allowed layout size) and centering means that the layout will be placed in a box that is precisely 7.5" wide by 7" high and centered on an 8.5x11 page. The default node is to draw nodes unlabeled. Subgraphs are employed to mark sets of nodes to be placed on the same rank (level) in the layout, and as local scopes for node or edge attribute initialization.

Click on the picture to view the .gv file

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