According to the concrete situation of present multimedia classroom, this paper designs a set of multimedia centralized controlling system.

根据当前多媒体教室的具体情况，设计了一套多媒体集中控制系统。

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After analysis and comparisons of various conference topologies, a centralized multimedia conference system using SIP as controlling signaling is pro-posed in this article.

该文通过对各种会议拓扑结构的分析和比较，提出了一种以SIP作为控制信令的、集中式拓扑结构的多媒体会议系统。

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The network of centralized monitoring and controlling of assistant system in power plant in LaiCheng of ShanDong province has went to function, and the remarkable benefit has been obtained.

山东莱城发电厂辅助系统集中监控网络现已投入运行，并且已经获得了显著的效益。

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