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Article by jekky

Chapter City Security Alarm Systems Technology programAn urban Security Alarm System ArchitectureCity level network alarm and monitoring systems, in terms of its overall structure can be summarized as the four-story structure, see below: Figure 1: Schematic diagram of the overall structure of the system1, device access layer Device access layer is from the front of the camera video signal and the alarm signal to the network access methods and transmission media. Equipment from the front camera access layer generally, intrusion alarm systems, transmission cables, local records, video codec and other equipment composition, some systems may also contain analog video matrix. A city alarm and monitoring systems should support the means of transmission and the transmission medium. Figure 2: the means of transmission of image information2, the network transport layer Network transport layer is the access to the network camera video signals and alarm signals transmitted and the flow of media. Network transport layer contains a very important part?? Information encryption. We mentioned before, City Security Alarm System is actually a large network, due to the special nature of the content of network transmission, the network system to special nets exist. Special network can build the network alone, it can be used in the existing network architecture build the virtual private network VPN technologies, use of tunneling transmission of video images on the information, alarm information for package to reach the purpose of information encryption. 3, application management Application management means that the whole network of information resources allocation and management center. Application management generally by the computer servers, databases, mass storage devices, large screen display devices and other hardware devices, and core management software. Application management major to complete the following tasks:1) access control?? A variety of access and application of the requested audit.2) distribution and forwarding?? Video information and alarm information dissemination and forwarding.3) Configuration and inspection?? Device parameter configuration and health checks.4) storage and retrieval?? Information storage and fast retrieval.5) failure service?? Assurance system failure not be deemed a partial spread throughout the system.4, third-party interface layer Interface layer is the third-party management through the application of the relevant information into the public security command system to recognize and receive the message format, the image information, alarm information is sent to the police chain of command methods and media. 2, City Security Alarm System overall network structure and management strategyCity Security Alarm System with network form, is a network system and network using the TCP / IP protocol and some specific strategies to complete video information, alarm information transmission, distribution, storage, retrieval and central management center under the management of the system health checks to ensure system security, reliability, stable operation. May be installed within a city, hundreds, thousands, tens of thousands or even hundreds of thousands of cameras, these cameras in a distributed form of the city’s various locations scattered, and the image information of these cameras is not just something in a certain terminal, they would “demand” in a different physical location assigned to the relevant departments, the information that these images are “circulation”. We can not imagine relying solely on traditional analog video matrix network of low-efficiency method and the use of police information network for the limited transmission bandwidth resources and manage the vast amounts of digital video information and alarm information (at least in the current technology can not guarantee that a single physical network carrying such a flood of video information), so the city alarm and monitoring systems in principle to build on the common carrier IP MAN is appropriate, make full use of IP MAN has grid resources, IP MAN huge “sponge-style” carrying capacity, IP MAN technology continues to evolve and professional network operators, technology and financial strength, to adopt and absorb the advantages of IPTV technology framework built video monitoring and alarming the city integrated information service platform, equipped with VPN Technology to ensure the safety of information transmission channel. If the telecom operator to provide an independent private network for the best. As a city-level digital video surveillance system must have some of the video stream and equipment and reasonable management strategy. Common TCP / IP protocol can not meet the complex city level, a large number of digital video networking needs. In this chapter, we Anshan City, Liaoning Province of city-level network video surveillance alarm system network strategy should be adopted.

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