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数字网的同步是指对网内各交换点或转接点的时钟频率、相位进行统一协调，它包括帧同步和时钟频率同步两个方面的内容。本文介绍的是时钟频率同步方面的内容。 一、准同步方式 准同步方式又称独立时钟方式。这种同步方式并不要求全网处于同步状态，而是要求在所有交换节点处都
Synchronization of digital network refers to the exchange of the network or switching point of the clock frequency and phase coordination, which includes the frame synchronization and clock frequency synchronization of two aspects. This article describes the clock frequency synchronization aspects. First, the quasi-synchronization method Synchronous method, also known as independent clock. This synchronization method does not require the entire network in sync, but requires that at all switch nodes