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提出了DDN业务延伸的问题 ,对如何利用光纤接入网实现DDN业务的延伸作了具体分析 ,并就具体的应用提出了组网方式及解决方案。对PSTN与DDN不是同一同步源的问题提出了解决办法
Proposed the extension of DDN service, analyzed how to extend the service of DDN using optical fiber access network, and put forward the networking mode and solution for specific application. The solution to the problem that the PSTN and the DDN are not the same synchronization source is proposed