摘要:同步数字体系(SDH,即Synchronous Digital Hierarchy)是当前电信运营商采用的主要基础传送网,SDH的关键技术之一就是定时同步。同步是指两个或两个以上信号在频率或相位上保持某种严格的特定关系。通常SDH设备同步问题会使所有与其相连的传输系统,交换系统都受影响,
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