The presentation layer is what we feel intuitively, and it shows the quality of the entire security monitoring system. Such as monitoring TV walls, monitors, treble alarm horns, automatic alarm connection calls, etc. belong to this layer.
Control layer The control layer is the core of the entire security monitoring system, it is a clear manifestation of the level of system technology. Usually we have two control methods-analog control and digital control. Analog control is an early control method. The console is usually composed of a controller or an analog control matrix. It is suitable for small local security monitoring systems. This control method has a lower cost and a lower failure rate. But for medium and large-scale security monitoring systems, this method seems to be complicated to operate without any price advantage. At this time, our more sensible choice should be digital control. Digital control is the industrial control computer as the control core of the monitoring system. It transforms complex analog control operations into simple mouse click operations, reduces the huge analog controller stack to an industrial control computer, and changes the complex and huge number of control cables. It is a serial line. It turns mid-range and remote monitoring into facts and provides the possibility for Internet remote monitoring. However, digital control is not so perfect. The price of the control host is very expensive, the module is wasted, the system may be in crisis, and the control is lagging.
Processing layer The processing layer may be called the audio and video processing layer. It will process the audio and video signals sent by the transmission layer for distribution, amplification, division, etc., and organically connect the presentation layer and the control layer. Audio and video distributors, audio and video amplifiers, video splitters, audio and video switchers and other devices belong to this layer.
The transport layer is equivalent to the blood of the security monitoring system. In small security monitoring systems, our common transmission layer equipment is video cable and audio cable. For medium and remote monitoring systems, we often use radio frequency cables and microwaves. For remote monitoring, we usually use the Internet. Cheap carrier. It is worth mentioning that the newly emerging transmission layer media-network cable / fiber. Most people have a misunderstanding in digital security monitoring. They think that the digitally-controlled security monitoring system used by the control layer is a digital security monitoring system, but it is not. The transmission medium of a pure digital security monitoring system must be a network cable or optical fiber. When the signal comes out of the acquisition layer, it has been modulated into a digital signal. The digital signal runs on a mature network, which is theoretically without attenuation. This guarantees the lossless display of remote monitoring images, which is unmatched by analog transmission. of. Of course, high-performance returns also require high-cost investment, which is one of the important reasons why pure digital security monitoring systems cannot be popularized.
Execution layer The execution layer is the command object of our control instructions. At some times, it is not very well separated from the support layer and the acquisition layer we will describe later. We believe that the controlled object is the execution layer device. For example: PTZ, lens, decoder, ball, etc.
As the name suggests, the support layer is used to support the back-end equipment, protecting and supporting the acquisition layer and execution layer equipment. It includes auxiliary equipment such as brackets, protective covers and so on.
Acquisition layer The acquisition layer is a key factor for the quality of the entire security monitoring system, and it is also a place where the system cost is large. It includes lens, camera, alarm sensor and so on.
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