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SDH (Synchronous Digital Hierarchy)
Note: Many topics at this site are reduced versions of the text in "The Encyclopedia of Networking and Telecommunications." Search results will not be as extensive as a search of the book's CD-ROM.
SDH is the ITU standard for a synchronous optical network that supports multiple gigabit-per-second transmission speeds over fiber-optic cable. Long-distance and regional telecommunication companies outside of North America implement SDH on their fiber-optic trunk lines. SONET, which is basically a subset of SDH, is used in the United States. Refer to "SONET (Synchronous Optical Network)" for more information.
Copyright (c) 2001 Tom Sheldon and Big Sur Multimedia.