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源流量点和ＵＰＣ控制点间的信元延迟变化（ＣＤＶ）对ＣＡＣ，ＵＰＣ的控制有着重要的影响．文中在分析ＣＤＶ成因的基础上，研究了基于信元接口的ＡＴＭ网络信元时隙映射的ＣＤＶ，提出了ＣＤＶ的计算公式和一些结论，并确定了ＣＤＶ容限．
The cell delay variation (CDV) between the source traffic point and the UPC control point has a significant impact on the control of the CAC and UPC. Based on the analysis of the causes of CDV, this paper studies the cell-slot mapping CDV of ATM network based on cell interface, and presents the calculation formula of CDV and some conclusions, and determines the CDV tolerance.