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 communicationsSynchronous 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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