Security engineering companies generally refer to manufacturers, businesses, and companies that operate, sell, and install security products or equipment.
So, what is the definition of security engineering?
Security means "security protection". Security is a protective measure taken for its own security needs. Security engineering is the process of achieving security protection, and security products are equipment that serves security engineering. Security engineering includes building intelligence (building intercom, etc.), video surveillance, access control attendance, burglar alarm, fire sprinkler, computer room engineering, etc.
Security monitoring system <br /> Security monitoring system is an emerging specialty that is being increasingly valued by people. As far as the current development is concerned, the application is becoming more and more widespread 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 opportunities for the development of this profession. But as far as the monitoring industry is concerned, the system composition has not been clearly divided, which makes it very inconvenient for engineers and users to talk about 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-the presentation layer, the control layer, the processing layer, the transmission layer, the execution layer, the support layer, and the 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.
I. Performance layer The performance city is what we feel most intuitively. It shows the quality of the entire security monitoring system. Such as monitoring TV wall, monitor, treble alarm horn, alarm automatic connection phone, etc. belong to this layer.
Control layer The control layer is the core of the entire security monitoring system, and it is the clearest manifestation of the technological level of the system. 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 lower cost and lower failure rate. However, for medium and large security monitoring systems, this method appears to be complicated to operate without any price advantage. At this time, our more sensible choice should be digital control.
Digital control is to use industrial control computer as the control core of the monitoring system. It transforms complex analog control operations into simple mouse click operations, shrinks the huge analog controller stack into an industrial control computer, and changes the complex and large number of control cables. For a serial telephone line. It transforms remote monitoring into facts and provides the possibility for Internet remote monitoring. However, the digital control is not perfect, the control host is very expensive, the module is wasted, the system may be in danger of crashing across the board, and the control is lagging.
3. Processing layer The processing layer may be called the audio and video processing layer. It will process the audio and video signals sent from the transmission layer for distribution, amplification, segmentation, 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.
4. Transmission layer The transmission layer is equivalent to the blood of a security monitoring system. In small security monitoring systems, our most common transmission layer equipment is video cables and audio cables. For medium and long-range monitoring systems, we often use RF lines and microwaves. For remote monitoring, we usually use the Internet. A cheap carrier. It is worth mentioning that the newly emerging transport layer medium-network cable / optical 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 is already modulated into a digital signal. The digital signal runs on a network that is currently mature. There is theoretically 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 well separated from the support and acquisition layer that we will talk about later. We believe that the controlled object is the execution layer device. For example: PTZ, lens, decoder, ball and so on.
6. Support layer As the name suggests, the support layer is used to support the back-end equipment, protect and support the acquisition layer and execution layer equipment. It includes auxiliary equipment such as brackets, protective covers, etc.
7. Acquisition layer The acquisition 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 lenses, cameras, alarm sensors, and more.
New Development of Transmission Technology in Security Engineering
Wireless video surveillance is accompanied by the start of China's 3G network coverage, the rapid development of COFDM, WIFI and other technologies, and the civilian use of satellites. 3G-based wireless video monitoring, COFDM-based wireless video monitoring, WIFI-based wireless video monitoring, satellite wireless video monitoring and other technologies have been further improved. Wireless video services have further improved the bit error rate, switching efficiency, delay, and bandwidth stability optimization. Wireless video surveillance will enter an era of rapid development.
For a long time, video surveillance systems are mainly used for the monitoring and control of important areas or remote locations. Video surveillance technology has also become more and more widely used in power systems, telecommunications rooms, factories, urban transportation, water conservancy systems, and community security. application. The video monitoring system transmits the real-time video stream collected at the monitoring point to the monitoring center in real time, which is convenient for the monitoring center to perform remote monitoring and direct the handling of emergencies in a timely manner.
There are obvious disadvantages to video surveillance based on traditional wired networks. These disadvantages include: the layout is limited, and the selection of monitoring points is generally close to the wired access point. This method limits the flexibility of the layout. The layout of the site requires a large amount of network cables and optical fibers. Often it will be very large, so the general wired monitoring is more suitable for the occasion where the basic network already exists; the engineering cycle is long, and laying the basic network takes time and energy; lack of flexibility, inconvenient expansion and adjustment, will increase the amount of engineering and unnecessary foundation Network construction; lack of mobility, which is a birth defect of wired networks.
In order to solve the above-mentioned problems, wireless video surveillance has emerged at the historic moment, so that video surveillance can completely get rid of the restrictions brought by the wired. It is foreseeable that with the continuous progress of wireless video surveillance related technologies, such as terminal technology, networking technology, and transmission technology, wireless video surveillance services will become one of the most typical applications of wireless network technology.
This article is published by the official website of World Friends Camera (http://caseyomah.com); World Friends Camera, a leading manufacturer of high-definition network surveillance cameras!