介绍分布式计算机数控系统通信网络的结构、通信协议、通信与管理软件的特点及功能。

Introduces its construction of distributed numerical control system, and communication protocols, and features and function of the software of DNC communication and managing.

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如何将会话初始化协议(SIP)与现有的通信网络有机结合，提供安全可靠的数据及通信服务已成为当今的热点问题。

How to combine Session Initiation Protocol (SIP) with current communication system well so as to provide secure telecommunication services has become a hot current issue.

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