分组网的同步与定时  

The Synchronization and Timing of Packet Based Network

作　　者：毛谦[1] 

机构地区：[1]武汉邮电科学研究院

出　　处：《现代电信科技》2006年第4期2-7,共6页Modern Science & Technology of Telecommunications

摘　　要：在通信网络由电路交换向分组交换演进的过程中,必然存在着由分组网提供部分 TDM业务,以及分组网与PSTN等电路网互联互通的问题,因此考虑分组网的同步与定时就显得很有必要。在介绍了几种实际需求后,对分组网的参考模型、参考时钟通过分组网的分配方法、通过分组网传送固定比特率(CBR)业务的时钟恢复、分组网的损伤对定时分配及恢复的影响、对设备与同步相关的要求等进行了初步的讨论。最后讨论了几种模型的定时性能要求的参考值。When communication network is evolving from circuit switching to packet switching, part of TDM services has to be carried by PBN （Packet Based Network）, and PBN has to be interconnected with other circuit networks such as PSTN. Therefore it is necessary to consider the synchronization and timing of PBN. After introducing some actual demand, this article gives some primary discussion on the following issues： the reference model to PBN, the distribution of reference clock through PBN, the clock recovery of CBR services which are transmitted through PBN, the influence of PBN damage on the time sharing and recovery, and the relevant requirements to the equipment and synchronization. At last, it discusses the required reference value of the timing performance of some models.

关 键 词：分组交换网 电路交换网 电路仿真业务 定时 同步 

分 类 号：TN919.34[电子电信—通信与信息系统] TN919.2[电子电信—信息与通信工程]