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1. Expression layer
The presentation layer is most intuitive to us. It shows the quality of the whole security monitoring system. Such as monitoring TV wall, monitor, tweeter alarm horn, alarm automatic answering telephone and so on, all belong to this level.
Two. Control layer
The control layer is the core of the whole security monitoring system, and it is the most explicit embodiment of the level of technology in the system. Usually, there are two ways of control -- analog control and digital control. Analog control is an early control method, and its console is usually composed of controller or analog control matrix. It is suitable for small local security monitoring system. This control mode is low cost and the failure rate is small. But for the medium and large security monitoring system, this way is complicated and has no price advantage, and we should be more wise to choose digital control. Digital control is the core of the control computer as the control system. It turns the complex simulation control operation into a simple mouse click operation, and reduces the huge analog controller stacking to a industrial computer, and turns a complex and large number of control cables into a serial telephone line. It turns the middle and long distance monitoring into reality and provides a possibility for Internet remote monitoring. But the digital control is not so perfect, the price of controlling the host is very expensive, the waste of the module, the crisis of the whole line collapse, the lag of the control and so on still exist.
Three. Processing layer
The processing layer may be called the audio and video processing layer, which will have the audio and video signals sent by the transmission layer to be distributed, magnified, segmented and so on, and organically connect the presentation layer with the control layer. Audio and video distributor, audio and video amplifier, video segmentation device, audio and video switcher and so on belong to this layer.
Four. Transport layer
The transmission layer is equivalent to the blood of the security monitoring system. In the small security monitoring and control system, our most common transmission layer equipment is video line and audio line. For medium and remote monitoring system, we often use radio frequency and microwave. For remote monitoring, we usually use Internet as a cheap carrier. It is worth mentioning that the new transport layer media -- netwire / fiber. Most people have a misunderstanding on the digital security monitoring. They think that the digital control system used by the control layer is the digital security monitoring system, but it is not. The transmission medium of pure digital security monitoring system must be wire or optical fiber. When the signal comes out from the acquisition layer, the signal has been modulated into a digital signal. The digital signal is running on a mature network. In theory, there is no attenuation in theory. This ensures the loss of the remote monitoring image, which is unparalleled in analog transmission. Of course, high performance return also requires high cost investment, which is one of the most important reasons why the pure digital security monitoring system can not be popularized.
Five. Executive layer
The executive layer is the command object that we control the instruction, and at some time, it is not very well separated from the support and the acquisition layer that we say behind. We think that the controlled object is the executive layer device. For example: Yuntai, lens, decoder, ball and so on.
Six. Support layer
As the name implies, the supporting layer is used for supporting the back-end devices, protecting and supporting the collection layer and execution layer devices. It includes support, protective cover and other auxiliary equipment.
Seven. Collection layer
Collection layer is the key factor of the quality of the whole security monitoring system, and it is also the most expensive part of the system cost. It includes lens, video camera, alarm sensor and so on.
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