In system high-level design, MVC design pattern is applied to design the three-layersystem architecture and the role and benefits of each layer are explained.
In the end, an example of ThreeLayer BP Networks fault diagnosis expert system of ignition is given.
最后，给出了一个基于三层BP网的点火系故障诊断专家系统的实例。
3
The interface of three-layer switch is the component that exchange data between switch and other devices in network it play a key role in switch system.