DDS技术在网同步中的应用

Application of DDS Technology In Network Synchronization

网同步是数字通信网的基本要求,其功能是将同步信息从基准时钟源向各个通信节点传递,让整个通信网的时钟工作于相同频率,以满足通信网络传递业务的需求。DDS是第三代频率合成技术,从相位出发,直接采用数字技术合成所需波形。这里首先介绍了网同步技术的原理,并分析了基于PLL技术的传统网同步技术的缺点,然后介绍了DDS技术的概况以及优点,最后提出了一种基于DDS技术的网同步设计方案。

Network synchronization is the fundamental requirement of digital communications network, and its basic function is to transfer the synchronization infomation from primary timing source to other nodes, make all clocks of the whole network working at exactly the same frequency and thus satisfy the need for network transaction. As the third generation technology of frequency synthesis, DDS directly synthesizes the required waveform by digital technology based on phase. This paper describes first the principle of network synchronization technology and analyzes defects of traditional synchronization technology based on PLL, then briefs DDS technology and its superiouities, and finally proposes a network synchronization design based on DDS.