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Synchronous Digital Hierarchy

Overview#

Synchronous Digital Hierarchy (SDH) is essentially the same as Synchronous Optical NETworking (SONET)

Synchronous Digital Hierarchy (SDH) and Synchronous Optical NETworking (SONET) are essentially the same, were originally designed to transport circuit mode communications

Synchronous Digital Hierarchy standard was originally defined by the European Telecommunications Standards Institute (ETSI), and is formalised as International Telecommunication Union (ITU) standards G.707, G.783, G.784, and G.803.

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