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.

More Information#

There might be more information for this subject on one of the following:

• SDH
• Synchronous Optical NETworking