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一、 ＳＤＨ和ＷＤＭ在技术原理上的异同 ＳＤＨ（同步数字系列）是取代ＰＤＨ（准同步数字系列）的新数字传输网体制，主要针对光纤传输，是在ＳＯＮＥＴ（同步光网络）标准基础上形成的。它把信号固定在帧结构中，复用后以一定的速率在光纤上传送。 ＳＤＨ在电路层上对信号进
I. Similarities and Differences between SDH and WDM on Technical Principles SDH (Synchronous Digital Hierarchy) is a new digital transmission network system that replaces PDH (Pseudo-Synchronous Digital Hierarchy) and is mainly aimed at optical fiber transmission and is formed on the basis of SONET (Synchronous Optical Network) standard of. It fixes the signal in the frame structure and multiplexes it at a certain rate on the fiber. SDH on the circuit layer into the signal