(Synchronous Optical NETwork/Synchronous Digital Hierarchy) A common reference to SONET networks worldwide. See SONET.
"SONET/SDH." YourDictionary, n.d. Web. 19 October 2018. <http://www.yourdictionary.com/sonet-sdh>.
SONET/SDH. (n.d.). Retrieved October 19th, 2018, from http://www.yourdictionary.com/sonet-sdh
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