The composition of security monitoring system
Security monitoring system is an emerging profession that people are paying more and more attention to. As far as the current development is concerned, the application is becoming more and more popular and the technology content is getting higher and higher. Almost all high-tech technologies can promote its development, especially the advent of the information age, and provide an opportunity for the professional development. But as far as the monitoring industry is concerned, the system composition has not been clearly divided, which makes it inconvenient to communicate between the engineering company and the user when it comes to the security monitoring system.
For the security monitoring system, according to the different functions of each part of the system, we divide the entire security monitoring system into seven layers-presentation layer, control layer, processing layer, transmission layer, execution layer, support layer, and acquisition layer. Of course, due to the increasing integration of devices, for some systems, some devices may exist in the system as multiple layers at the same time.
1. Performance layer Performance City is what we feel most intuitively, it shows the quality of the entire security monitoring system. Such as monitoring TV walls, monitors, treble alarm horns, automatic alarm answering calls, etc. belong to this layer.
2. Control layer The control layer is the core of the entire security monitoring system, and it is the most clear manifestation of the system's technological level. 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 turns 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 phone line. It turns mid-range and remote monitoring into reality, making it possible for Internet remote monitoring. But digital control is not so perfect, the price of the control host is very expensive, the module is wasted, the system may have a crisis of collapse across the board, the control is lagging, and other problems still exist.
3. 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, and division. It organically connects 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.
4. Transmission layer The transmission layer is equivalent to the blood of the security monitoring system. In small security monitoring systems, our most 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. A 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 network that has matured at present. Theoretically, there is no attenuation. This guarantees the lossless display of remote monitoring images. Comparable. Of course, high-performance returns also require high-cost investment, which is one of the most important reasons why pure digital security monitoring systems cannot be popularized.
V. Execution layer The execution layer is the command object of our control instructions. At some times, it is not completely separated from the support and acquisition layer we will describe later. We believe that the controlled object is the execution layer device. For example: PTZ, lens, decoder, ball, etc.
6. Support layer As the name implies, 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.
7. Collection layer The collection layer is the key factor for the quality of the entire security monitoring system, and it is also the place where the system cost is the largest. It includes lens, camera, alarm sensor and so on.
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