【作者】 柏林；

【导师】 卢辉斌；

【作者基本信息】 燕山大学 ， 电路与系统， 2004， 硕士

【摘要】 本课题介绍了基于分组交换网络仿真TDM电路的方法。随着通信网络向下一代网络的演进，以IP技术为核心的网络成为主流。如何保护原有的TDM设备，成为人们关注的重要方面。因此对本课题的研究与设计具有广阔的前景。目前语音基本还是通过TDM网络来承载，这属于电路交换范畴。分组交换网络无处不在，是网络发展的必然趋势，这就导致TDM业务向IP网络过渡。不过分组网络属于分组交换范畴，二者在结合中必然面临系列问题，需要一种技术将它们有机地融合在一起。本文从当前网络发展的背景出发，首先介绍了基于分组交换网络仿真TDM的原理，两种仿真技术的差异。然后又分析了如信令处理、延时抖动、时钟恢复、网络同步以及丢包补偿等关键问题。最后通过对网关系统的设计和调试，实际分析了包载荷与带宽之间的关系、时钟同步的关键因素、丢包的影响等几个重要方面，并建立了相应的参考模型，同时利用计算机命令行或者图形化界面两种方式实现对设备的配置与测试。由于随着网络的发展技术上还处于不断完善的阶段，因此还需要对此进行进一步的研究，同时设备还需要一个功能完善和技术改进的过程。尽管如此，还是取得了一定的成果，完成了产品的研发，并已经在市场上开始应用。更多还原

【Abstract】 In this paper, a method of TDM Circuit Emulation Service based on Packet Switched Network is introduced. Along with the evolution of the Communication Networks, that is transiting to the Next network. The Internet Protocol technology is turning into the core of networks. How to protect traditional TDM devices has been importance attentive aspect. So the system discussion and design has a wide application future. Because voice is carried out through TDM network, it belongs to the category of circuit switch. Packet switching networks exist everywhere and it is the inevitable trend. It results in that TDM traffic transits to IP network. But packet network belongs to packet switch category, the combine of these two will consequentially face a series of problems. That needs a technology to combine two TDM and IP.In this paper, by analyzing the current network development trend, first, introduced basic theory of Circuit Emulation Service over Packet Switched Network, and difference of two circuit emulation technologies. Then analyzed some problems of signaling processing, delay and jitter, clock recovery Mechanism, network timing and packet loss compensating, etc. In the end, it analyzes the relation between the packet load and bandwidth, the key element of the synchronization, the effect of the packet loss ect. It also sets up the corresponding model. By designing and testing the system, the configuring and the supervising are realized in using CLI and GUI at the same time.Because this technology is consummating moment along with the development of network，it needs to go to study in deeply, and the device needs to a progress of function perfected and technology improved. However, some achievements have been gained, and accomplished designing and testing of the system, and beginning to be application in the market.更多还原