!!! Overview
[{$pagename}] ([SDH]) is essentially the same as [Synchronous Optical NETworking] ([SONET])[{$pagename}] ([SDH]) and [Synchronous Optical NETworking] ([SONET]) are essentially the same, were originally designed to transport circuit mode communications[{$pagename}] [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].

!! More Information
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