Maintenance and management of the network is necessary for some network system of certain scale.

对于一定规模的网络系统来讲，网络的管理和维护性是必需的。

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And then it introduces the realization of the network resource database, which includes integrable ware database module, virtual database module, system running module and maintenance module.

进一步以《机械制图》课程为例介绍了网络资源库的具体实现，其中包括积件库、虚拟库、系统运行与维护等模块。

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Secondly, it introduces the communication protocol of this system, including the frame structure, instruction structure and the process of wireless network setting up and maintenance.

其次，讲述了本系统使用的通信协议，包括数据帧的格式、命令格式，以及无线网络的建立和维护过程。

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