《光纤通信》_第8讲 光同步数字传输网

光纤大容量数字传输如今都选用同步时候复用(TDM)技术。复用又分为若干等级，先后有两种传输系统：?准同步数字系列(PDH)?同步数字系列(SDH)

(Optical fiber high-capacity digital transmission is now using synchronous time multiplexing (TDM) technology. Multiplexing is divided into several levels, and there are two transmission systems: ? Pseudo-synchronous digital series (PDH)? Synchronous digital series (SDH))

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