This paper briefly introduced the function and principle of data link system and built its fault tree, and it analyzed the fault mode appeared on data link system.

本文简要介绍了数据链系统的功能和原理，建立了数据链系统的故障树，并对数据链系统出现的故障模式进行了分析。

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Fault tree model is the graphical expression of connection of basic events which result in system fault, and used in qualitative and quantitative analysis of system fault model.

故障树模型是导致系统失效的基本事件之间逻辑关系的图形表示，应用于系统失效模型的定性和定量分析。

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Fault tree expert system (FTES) is GUI software based on the local database, which is developed to aid the FT-building work of fluid systems in NPP.

故障树辅助建树专家系统(FTES)是基于本地机数据库的图形界面软件，其目标是辅助建造核电站流体系统故障树模型。

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