Construction of University Security Monitoring Special Network to Solve the Problems of Monitoring Transmission

The network monitoring system is a kind of revolutionary technology. It adopts the standard TCP/IP protocol in the computer network and Internet communication to form the video stream, transmits it in the wired or wireless network, and can be integrated with other network applications as a whole system. The network video surveillance system uses the standard LAN/MAN/WAN/Internet as the core line for transmitting image, sound and data information. Network monitoring is based on the network. Therefore, the construction of the campus network and the security monitoring network have a direct relationship.

At present, the campus network construction of the school consists of four parts. The first is the campus intranet. It is centered on computer-aided instruction (CAI), office automation (OA), campus information dissemination and sharing, various professional and college LANs, and has distinctive features. An integrated system with a unique computer campus culture as its goal. The second is the education network, which is a nationwide academic computer interconnection network running through the Education Network (China Education and Scientific Research Network) CERNET. It is mainly for educational and research institutions, and conducts academic exchanges and seminars. The third is the Internet, usually through the CERNET as an export, or directly leased to a dedicated Internet access, to display the school's image and strength to the outside world, access to outside teaching resources, and carry out some distance education, training and other social activities. The fourth is the integrated management aided application system network, that is, the security system monitoring network, campus card, telephone network, ATM voice teaching examination network and other special system networks.

In the fourth part of the dedicated system network, the video surveillance system occupies a large amount of network resources. In order to build an efficient, smooth, and high-definition monitoring security system, transmission is a headache for the school.

Construction Monitoring Private Network to Solve Transmission Challenges Security monitoring has unique security features. It can only be used and regulated by the school security department and related leaders. Non-openness urges schools to build a monitoring network to ensure the security of the system. Sexuality can be dedicated to private networks to ensure that the system operates normally and is free from outside 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.

In particular, the current campus security incidents have been repeated and the consequences have been extremely poor. The education sector and all sectors of society have also paid unprecedented attention to the safe campus, and have successively issued relevant guiding policies and regulations, which have led to an increasingly large-scale and standardized network monitoring system. Unprecedented 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 large-scale high-definition monitoring systems, the optimization of application schemes and technologies is not mature, and it 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.