Campus security monitoring has unique security features. It can only be used and regulated by the school security department and relevant leaders. Non-openness urges schools to build a monitoring network to ensure the security and confidentiality of the system. To ensure the normal operation of the system, without external interference. The video private network is the 'nerve' of the network monitoring system. It ensures the stability of the system and is also the basis for the continuous expansion of the network monitoring system.
At present, most schools already have a campus network and have already loaded normal data applications. But in the security system, especially the network video signal and day-to-day data have relatively big differences, it has the characteristics of continuous, continuous, large-packet transmission, once the network fails, it will lead to video interruption, video loss phenomenon , it will directly affect the daily surveillance and video evidence collection. At this time, an abnormal situation may occur and the loss may be incalculable. However, it is precisely because most of the campus networks are already in a normal state of operation. Therefore, many school network security systems will first choose to use the existing network to expand applications, that is, use the campus public network to build monitoring systems. The advantage is that it can save the input cost of building a private network, but it exposes many hidden network risks, such as lack of network resources, malicious destruction of staff and students in the school, heavy system troubleshooting and maintenance, and because all security system application terminals are close to users. The use of habits, all using WINDOWS operating system, there will be viruses and Trojans in the information exchange process, these problems will directly lead to the gradual collapse of the monitoring system, while also affecting the normal operation of other applications in the network, so that, Originally, it was a cost-saving approach, but it turned out to be a sensible investment that was costly and troublesome.
Especially for the campus security incident, the consequences were extremely poor. The education sector and the community also paid unprecedented attention to the safe campus, and successively introduced relevant guiding policies and regulations, making the network monitoring system increasingly large-scale and standardized, and exhibiting unprecedented results. Urgency.
Therefore, it is the best choice for many school users to ensure the safe and stable operation of systems such as video surveillance, alarms, and access control through the construction of security surveillance private networks. Although the initial investment is relatively large, the input and output efficiency can be comprehensively considered. In the future, it will show the system's economic and expansion advantages. Video surveillance systems, alarms, access control systems are usually set in the monitoring center of the three centers, relative to video surveillance, the latter two occupied very little bandwidth, alarm, access control subsystem only need to control the host alarm and access control Access to the private network can be. The users of colleges and universities in Beijing, Shanghai, Northeast China, and Guangdong have almost chosen the concept of the design of the security monitoring network, which has achieved significant results.
At present, the construction of monitoring private networks is still using general-purpose Ethernet as the main networking mode, and building a private network system with a tree network structure, and implementing hierarchical network management and load balancing through core, aggregation, and access modes. Comprehensive consideration of security special network construction from two aspects:
First of all, a number of network applications, including network video surveillance, alarm, network access control, and some schools need to access the local public security alarm center, and even fire-fighting systems, showing more and more integration needs. Improve the linkage and efficiency between systems, which requires a common network foundation, otherwise the docking between different networks also requires a lot of equipment and technical costs.
Secondly, the maturity and stability of network transmission technology, as well as the optimization of video compression technology, combined with network transmission quality control technology, can meet the bandwidth requirements of current high-definition video transmissions as long as it can prevent private network resources from being illegally occupied.
Considering the future system integration and application expansion, it is only necessary to optimize and upgrade the core equipment. Of course, the understanding and preference of network users for school users also promotes the entry of security monitoring systems such as EPON and ATM to a certain extent. EPON is a shared medium transmission method adopting wavelength division multiplexing technology. In the large-scale high-definition monitoring system, the optimization of application solutions and technologies is not mature, which will cause bandwidth bottlenecks in the video transmission process. ATM is a transmission mode that adopts asynchronous time division multiplexing technology, and adopts a fixed cell for data processing, coupled with high costs under high bandwidth requirements, and is not suitable for real-time video data transmission.
Therefore, the Ethernet networking mode is still the most suitable, most mature, and most stable security network construction method. However, there must be a premise that the network industry itself is a good and a mixed free market. Selecting a network product with guaranteed performance is the key foundation. The choice of network products is based on two requirements. The first is the performance requirements, including backplane bandwidth, packet forwarding rate, concurrent traffic processing, port configuration, and optimization strategy; on the other hand, it is the product's own stability requirements, including product quality and The actual industry application experience and other factors are the selection criteria. Especially with high-definition network video surveillance systems, because each stream of video has a large code stream and a relatively high transmission requirement, the network needs to be selected in accordance with the actual access, aggregation, core transmission processing bandwidth and redundant bandwidth requirements required by the high-definition surveillance system. product.
At present, most schools already have a campus network and have already loaded normal data applications. But in the security system, especially the network video signal and day-to-day data have relatively big differences, it has the characteristics of continuous, continuous, large-packet transmission, once the network fails, it will lead to video interruption, video loss phenomenon , it will directly affect the daily surveillance and video evidence collection. At this time, an abnormal situation may occur and the loss may be incalculable. However, it is precisely because most of the campus networks are already in a normal state of operation. Therefore, many school network security systems will first choose to use the existing network to expand applications, that is, use the campus public network to build monitoring systems. The advantage is that it can save the input cost of building a private network, but it exposes many hidden network risks, such as lack of network resources, malicious destruction of staff and students in the school, heavy system troubleshooting and maintenance, and because all security system application terminals are close to users. The use of habits, all using WINDOWS operating system, there will be viruses and Trojans in the information exchange process, these problems will directly lead to the gradual collapse of the monitoring system, while also affecting the normal operation of other applications in the network, so that, Originally, it was a cost-saving approach, but it turned out to be a sensible investment that was costly and troublesome.
Especially for the campus security incident, the consequences were extremely poor. The education sector and the community also paid unprecedented attention to the safe campus, and successively introduced relevant guiding policies and regulations, making the network monitoring system increasingly large-scale and standardized, and exhibiting unprecedented results. Urgency.
Therefore, it is the best choice for many school users to ensure the safe and stable operation of systems such as video surveillance, alarms, and access control through the construction of security surveillance private networks. Although the initial investment is relatively large, the input and output efficiency can be comprehensively considered. In the future, it will show the system's economic and expansion advantages. Video surveillance systems, alarms, access control systems are usually set in the monitoring center of the three centers, relative to video surveillance, the latter two occupied very little bandwidth, alarm, access control subsystem only need to control the host alarm and access control Access to the private network can be. The users of colleges and universities in Beijing, Shanghai, Northeast China, and Guangdong have almost chosen the concept of the design of the security monitoring network, which has achieved significant results.
At present, the construction of monitoring private networks is still using general-purpose Ethernet as the main networking mode, and building a private network system with a tree network structure, and implementing hierarchical network management and load balancing through core, aggregation, and access modes. Comprehensive consideration of security special network construction from two aspects:
First of all, a number of network applications, including network video surveillance, alarm, network access control, and some schools need to access the local public security alarm center, and even fire-fighting systems, showing more and more integration needs. Improve the linkage and efficiency between systems, which requires a common network foundation, otherwise the docking between different networks also requires a lot of equipment and technical costs.
Secondly, the maturity and stability of network transmission technology, as well as the optimization of video compression technology, combined with network transmission quality control technology, can meet the bandwidth requirements of current high-definition video transmissions as long as it can prevent private network resources from being illegally occupied.
Considering the future system integration and application expansion, it is only necessary to optimize and upgrade the core equipment. Of course, the understanding and preference of network users for school users also promotes the entry of security monitoring systems such as EPON and ATM to a certain extent. EPON is a shared medium transmission method adopting wavelength division multiplexing technology. In the large-scale high-definition monitoring system, the optimization of application solutions and technologies is not mature, which will cause bandwidth bottlenecks in the video transmission process. ATM is a transmission mode that adopts asynchronous time division multiplexing technology, and adopts a fixed cell for data processing, coupled with high costs under high bandwidth requirements, and is not suitable for real-time video data transmission.
Therefore, the Ethernet networking mode is still the most suitable, most mature, and most stable security network construction method. However, there must be a premise that the network industry itself is a good and a mixed free market. Selecting a network product with guaranteed performance is the key foundation. The choice of network products is based on two requirements. The first is the performance requirements, including backplane bandwidth, packet forwarding rate, concurrent traffic processing, port configuration, and optimization strategy; on the other hand, it is the product's own stability requirements, including product quality and The actual industry application experience and other factors are the selection criteria. Especially with high-definition network video surveillance systems, because each stream of video has a large code stream and a relatively high transmission requirement, the network needs to be selected in accordance with the actual access, aggregation, core transmission processing bandwidth and redundant bandwidth requirements required by the high-definition surveillance system. product.
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