N-GEN Communications Web-based Seminars ©NGCS

Seminar - An Overview of Communications Technologies

Module 5 - SONET, WDM, DWDM and B-ISDN Technologies                                                             Slide 22 of 76 _________________                                                                                  __________

                                             Optical Transmission Standards

                                         Synchronous Optical Network (SONET) 

                                         Synchronous Digital Hierarchy (SDH)

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SONET and SDH are transport standards capable of delivering transmission rates in G bps..

SONET -  Is a set of standards for fiber optical transmission medium designed for broadband applications. It is independent of services and applications. It is a North American Standard. The basic rate for SONET is 51.84 M bps.

SDH - Is a European standard for fiber optical transmission medium. It is equivalent to SONET. The basic rate for SDH is 155.52 M bps.