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集群通信系统是专用于调度的通信系统。它从一对一对讲机的形式、同频单工组网形式、异频单（双）工组网形式到单信道一呼百应以及进一步带选呼的系统,发展到多信道自动拨号系统。最早进入我国的集群通信系统是模拟集群通信系统。其信令是采用数字方式的,话音传输采用模拟方式,这是模拟集群系统与数字集群系统的最大区别。现在主流的数字集群系统采用的是TDMA的系统,另外在信道编码上采用了先进
Cluster communication system is dedicated to scheduling communication system. It develops from multi-channel automatic dialing system from the form of one-to-one walkie-talkie, same-frequency simplex networking, inter-frequency single (dual) industrial network to single channel and selective calling system. The earliest trunking communication system entering our country is analog trunking communication system. The signaling is digital, voice transmission using analog mode, which is the biggest difference between analog cluster system and digital cluster system. Now the mainstream digital trunking system uses the TDMA system, in addition to the channel coding using advanced