本文主要论述3G核心网电路域设备性能测试话务模型、测试组网、测试工具、测试内容等，为相关测试提供经验。
This paper focuses on 3G core network equipment performance testing traffic model, network testing, test tools, test content, and so on, provide experience for the relevant tests.
核心网电路域有两种路线可以选择，本文对每一种路线需要考虑的问题进行了分析。
There are two choices for the circuit network: to evolve to LMSD or not, the detailed analysis is given in the article.
在R4阶段，ATM和IP承载渐渐取代TDM承载成为电路域的主要传播媒介，这两类传输媒介的引入使得核心网采用的编解码方式更加的灵活。
In the Stage of R4, ATM and IP become main medium of circuit switch instead of TDM, which make codec modes of core network more agility.
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