每两个单元间具有视频交叉链路通信路径，将能够进行系统备份。
A video cross link communication path between both units will enable system redundancy.
该算法能够找出任意两颗卫星间通信的最佳路径集合，同时能够在链路质量容许的情况下，尽量避免通信链路切换的发生，从而较大地提高了系统性能。
It can find the aggregate of best communication routes between any two satellites, and can reduce link switching as much as possible, thus improves the system performance.
该系统采用卫星链路实现教学现场的直播，采用地面IP网实现师生间多模式的交互。
This system adopts satellite linking route to realize on-the-spot teaching and use IP network on the earth to realize multiple modes of interaction between students and tutors.
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