Various optical link technologies are used in large enterprise infrastructures to assure some kind of connectivity. Some of the optical networking techniques include SONET/SDH, CWDM, DWDM, and RPR.
Synchronous Optical Network and Synchronous Digital Hierarchy
Synchronous Optical Network (SONET) and Synchronous Digital Hierarchy (SDH) are usually considered similar, although there are some key differences between the two technologies. SONET is the North American high-speed transport standard for digital-based bandwidth and it is an ANSI standard. It provides incrementally increased rates that can be used on digital optical links. On the other hand, SDH is European and it . . .
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