Security wired and wireless integration to local conditions

The advantage of cable network monitoring is low transmission cost, large network bandwidth and good transmission effect, but it can't realize the monitoring demand of mobile industry. 3G Wireless monitoring advantage is to realize the mobile audio and video monitoring, easy to temporary monitoring, but high transmission costs, low network bandwidth, transmission effects are affected by a variety of factors.

In the field of networked monitoring, cable network monitoring accounted for 10% of 90%,3G wireless network monitoring. Wireless network monitoring is an extension of cable network monitoring. Most of the current monitoring projects, using wireless monitoring and cable monitoring, are mostly law enforcement projects. Take a certain urban management project as an example, the important monitoring road monitoring points using Network Camera (ST-NT8269H) through the public network access, law enforcement department building monitoring points using Network video server (ST-NT208H) through LAN access, law enforcement vehicles mobile monitoring points using car DVR ( ST-HD7004A) through 3G network access, law enforcement personnel hand-held (ST-NT3032H) through 3G network access. In the computer room to build a monitoring platform (Network Monitoring Center platform E-nvs), receiving the front-end transmission through different networks of audio and video and a variety of alarm signals, users in the remote through the PC computer installed monitoring clients monitor the video information.

The advantage of the cable monitoring is that the line is relatively reliable, the image quality transmission is guaranteed, can see clearer and coherent image, disadvantage is not flexible enough, the monitoring range is limited by the cable, can not be monitored under the motion environment. The advantage of wireless monitoring is that it can not be limited by the monitoring cable, and with the large-scale coverage of 3G network, the scope of its monitoring can be difficult to reach the cable monitoring, wireless can be used in a large range of personnel mobile monitoring scene, but also the cable network can not do. The disadvantage of wireless network is that wireless signal transmission, easy to be disturbed, image quality and fluency will be worse than wired network, and the openness of wireless networks may also bring security problems.

For several mainstream wireless technology, 3G monitoring because of its wide coverage, cost and cost relatively low, and gradually become the mainstream of non-military wireless monitoring applications, its future development trend from the current pursuit see see Clearly, from high-end industry to the low end of the common user field gradually spread. Wi-Fi due to the transmission distance is limited, suitable for a small range of indoor monitoring, with operators Wi-Fi hotspot is increasing, can also become a cable monitoring network supplement.

According to the current trend of development, wireless monitoring needs, although is gradually increasing, but relative to the cable network, wireless network is still in the initial stage, its market share relative to the cable network, the mainstream of the wireless front-end monitoring manufacturers are generally wired front-end 5%-10%.

At present, Wired, wireless is a combination of the two, forming a real user needs of a complete monitoring solution, the development trend of the wired network is a higher definition and more intelligent applications, wireless network development trend is a broader coverage area, better image quality and reliability of a higher network.

Cable monitoring is the most concerned about its video effects, such as image clarity, real-time image transmission, vision and environmental changes can meet its monitoring requirements. 3G wireless monitoring is mainly about its portability and operation of convenience, as well as the integrity of the overall solution. For example, installed in the car wireless monitoring, to consider the hard disk shock, in the car to take electricity, delay shutdown, two-way intercom and so on, and portable wireless monitoring to take into account the battery time, heat, weight and so on.

The cable monitoring is more stable, the development time is long, the technology is mature. Wireless easy to use, has the potential, but not mature. In general, if the monitoring point is more fixed, convenient wired installation, priority to use wired, such as the Peace City project in the important security scene monitoring more use of cable mode, and for mobile law enforcement vehicles, such as more mobile monitoring points using wireless mode.

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In addition, for some sites, such as the possible removal of monitoring points, but also the use of wireless mode. At present, cable accounts for more than 90% of the share, wireless is gradually increasing, especially wireless vehicle monitoring growth is very rapid.

The future development of monitoring network will require the video surveillance industry's transmission mode more flexible, adaptable, can be quickly deployed, flexible network, but in essence still can not be separated from the wireless communication and cable communications category. The traditional video monitoring method relies on the wired media for signal transmission, and the wired is very suitable for the deployment of video surveillance network of camera area.

For long-distance video transmission, the main use of the current is optical fiber. But for the scattered, isolated areas of the single point mode, fast moving objects, the need for temporary deployment of video monitoring, the use of wired is not realistic. In this case, using a wireless network for video transmission becomes the only option.

3G products are mainly 3G cameras, 3G vehicle law enforcement system, 3G soldier law enforcement system, 3G car DVR and so on. Mainly by the operator's network to carry out video signals and other data transmission. 3G products will greatly expand the range of mobile monitoring, flexible response to all kinds of emergencies, and has temporary network convenience, mobility strong, support high-speed mobile and other characteristics, can be monitored at any time.

Wi-Fi products are mainly used for fixed-point wireless monitoring, through the network Camera and video server installed wireless communication module, to achieve the wireless transmission of short distance video data. If you are going to erect a base station, use a directional antenna. Wi-Fi transmission technology is mainly used in environmental protection, oil fields, meteorology, water Conservancy, land, mining, highways, electricity, security and other industries, most of the equipment deployed in the personnel difficult to reach or cable layout difficult areas.

Because of the WiMAX network construction problem, the current WiMAX product market is relatively rare. One of the most important diagnoses-because WiMAX is not clear profit model. WiMAX can only provide data services, so the provision of voice services need to use VoIP technology to achieve. Although WiMAX has established an experimental network, WiMAX may still have a long way to go in China. However, it is worth noting that WiMAX itself is more suitable for the technical characteristics of high-definition video transmission.