Public network radio is the use of operators of the wireless data network as a transmission channel to achieve the functions of the traditional radio, outstanding advantages, it is not limited by distance, as long as there is a carrier signal can be called through, can be nationwide or even global.

    Public network radio usually contains the following parts: public network radio terminal (two way radio), mobile data card, platform account, and platform server. Public network radio has three main advantages: first, wide coverage, almost no distance limit; The second is low cost, using the public network, saving costs; Third, it can also transmit video images, through the on-site scheduling command of the two way radio, effectively ensure the operation of the activity, so that the commander of the activity site can understand the activity site at a glance, can deal with all emergencies, and effectively ensure the smooth progress of the activity.

    Large events can consider the use of portable and compact radios. Voice anti-interference ability is good, electric resistance, voice control launch free hands and other functions. Nowadays, a distinctive feature of modern large-scale performance activities is that the scale is huge, there are many performances and technical departments participating, the command and coordination relationship is complex, and the call volume is large. The function, reliability and real-time requirements of the communication system have been greatly improved than in the past. It is necessary to establish a communication command and dispatch system with high technology, high standard, high reliability, high efficiency, high security and complete functions.

    Take performance activities as an example, the internal communication system of large-scale performance activities needs to be guaranteed in many aspects, including the general command system of the chief director and the executive director, the internal communication system of the technical, production, performance and logistics teams, the command system of the general command system to the technical, production and performance departments, and the broadcast system of the actors. A comprehensive platform involving wired systems, wireless systems and broadcast systems. Therefore, the common practice is to use a matrix calling system that can integrate wired and wireless systems as the basis.

    Among them, each wired and wireless sub-system accesses the call matrix through different interfaces and interface devices, and manages the cross-connection relationship of each input and output port of the control matrix through a computer. The matrix system is a four-wire system, which generally sets up a master matrix to manage the main wired and wireless interfaces. In order to ensure the reliability of the system, the redundant design of double fiber ring network must be adopted in the multi-matrix design, which has the advantage that the operation of the whole system will not be affected when one connection line fails.