The technique of the multi - channels sharing and the bus topological structure are adopted in the system . the technique of the multi - channels sharing is an effective method to increase the system ' s capacity and the utilization factor of the channels 该系统采用了多信道共用技术和总线式拓扑结构，对于信道采用了混合信道指配模式，即通话绳路的动态指配模式和信令绳路的固定指配模式。
