SONET（Synchronous Optical Network）
SONET（SynchronousOpticalNetwork）是ANSI定义的同步传输体制，是一种全球化的标准传输协议，采用光传输，传输速率组成一个序列，包括STM-1（155Mbit/s）、STM-4c（622Mbit/s）和STM-16c/STM-16（2.5Gbit/s），每一级速率都是较低一级的4倍。由于是同步信号，因此SDH可以方便地实现多路信号的复用。
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