Install electromechanical, analog and digital trunking systems, circuits and equipment in telecommunications central offices and switching centres.

在电信中心办公室和交换中心安装工机电，模拟和数字集群系统，电路和设备。

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A kind of modified packet reservation random access protocol for digital trunking systems is studied, which could reduce collisions among packet reservations and increase the system's throughout.

针对数字集群移动通信系统，提出一种新的随机预约控制方式，减小了预约分组信号冲突发生，提高了系统的吞吐量。

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