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Seminar - An Overview of Communications Technologies


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Module 5 - SONET, WDM, DWDM and B-ISDN Technologies                                                             Slide 26 of 76 _________________                                                                                  __________

                                                What is SDH?

                                A European Standard for Optical Data Transmission

                                Similar to SONET

                                SDH and SONET Standards Come Together at OC-3

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SDH is a European standard comparable to SONET standard in North America..

CCITT recommended SDH standard to accommodate multiplexing of 34 M bps signal used in Europe. The first level of SDH structure operates at 155 M bps while SONET first level operates at 51.84 M bps. SDH is identical to SONET for all payloads that will require greater than 150 M bps capacity.