Wired and wireless security integration must be tailored to local conditions

WiredNetworkMonitoringThe advantage is low transmission costs, high network bandwidth, and good transmission performance, but it cannot meet the monitoring needs of the mobile industry.3G wirelessThe advantage of monitoring is that it can implement Mobile audio and video monitoring and is easy to temporarily monitor. However, the transmission cost is high, the network bandwidth is low, and the transmission effect is affected by multiple factors.

In the network monitoring field, wired network monitoring accounts for 90%, and 3G wireless network monitoring accounts for 10%. Wireless Network Monitoring is an extension of wired network monitoring. Currently, most of the common monitoring projects use wireless monitoring and wired monitoring at the same time. Take a city management project as an example, the important monitoring road monitoring points using Network Camera (ST-NT8269H) access through the public network, the monitoring points in the Law Enforcement Department Building Using Network Video Server (ST-NT208H) access through the LAN, law enforcement vehicles mobile monitoring points using car DVR (ST-HD7004A) through 3G network access, law enforcement staff hand-held individual (ST-NT3032H) through 3G network access. Establish a monitoring platform in the data center (Network Monitoring Center platform E-NVS), receive front-end audio and video transmission through different networks and a variety of alarm signals, users can remotely monitor various video information through monitoring clients installed on PCs.

The advantage of Wired monitoring is that the lines are relatively reliable, the image quality is ensured, and clearer and coherent images can be seen. The disadvantage is that the monitoring scope is limited by cables, it cannot be monitored in a sports environment. The advantage of wireless monitoring is that it is not limited by monitoring cables. With the large-scale coverage of 3G networks, the monitoring range is too large for wired monitoring, wireless networks can be used in large-scale mobile monitoring scenarios, which cannot be implemented by wired networks. The disadvantage of wireless networks is that wireless signal transmission is vulnerable to interference. Image Quality and smoothness are worse than those of wired networks, and the openness of wireless networks may also lead to security issues.

For several mainstream wireless technologies, due to its wide coverage and low cost, 3G monitoring has gradually become a mainstream application of non-military wireless monitoring, its future development trend will be clearly seen from the current pursuit, and gradually spread from the high-end industry field to the low-end common user field. Due to limited transmission distance, Wi-Fi is suitable for small-scale indoor monitoring. With the increasing Wi-Fi hotspots of operators, it can also be a supplement to wired monitoring networks.

According to the current development trend, although the demand for wireless monitoring is gradually increasing, compared with wired networks, wireless networks are still in its infancy, with a small market share compared with wired networks, the sales volume of wireless front-ends of mainstream monitoring manufacturers is generally 5%-10% of that of Wired front-ends.

Currently, wired and wireless networks are being combined to form a complete monitoring solution that truly meets user needs. The development trend of wired networks is to have higher definition and more intelligent applications, the Development Trend of wireless networks is a network with a wider coverage area, better image quality and higher reliability.

Wired monitoring is most concerned with video effects, such as image definition, real-time image transmission, and whether changes in the field of view and environment can meet the monitoring requirements. 3G wireless monitoring mainly investigates the convenience of carrying and operation, as well as the perfection of the overall solution. For example, for on-board wireless monitoring installed on the vehicle, consider the hard disk shockproof, power-off on the car, delayed shutdown, two-way intercom, and other aspects; the portable wireless monitoring carried with you should consider the battery time, heat dissipation, weight and other aspects.

Wired monitoring is relatively stable, has been developing for a long time, and has mature technology. Wireless is easy to use and has potential, but it is not mature. In general, if the monitoring site is relatively fixed to facilitate wired installation, wired is preferred. For example, wired is usually used for important security scenarios in the Safe City project; mobile law enforcement vehicles and other traffic monitoring sites are mostly wireless.

In addition, some site monitoring sites that may be removed also adopt wireless methods. At present, wired networks account for more than 90% of the shares, and wireless networks are gradually increasing. In particular, wireless vehicle monitoring is growing rapidly.

In the future, the development of monitoring networks will require that video surveillance industry transmission methods be more flexible and adaptive, and can be quickly deployed and flexibly networked. However, they cannot be separated from wireless communication and wired communication. The traditional video monitoring method relies on wired media for signal transmission. Wired is very suitable for deploying video surveillance networks in the camera area.

For long-distance video transmission, optical fiber is used currently. However, it is unrealistic to use wired cables for scattered, remote single-point mode, fast moving objects, and temporarily deployed video surveillance. In this case, using wireless networks for video transmission is the only choice.

3G products include 3G cameras, 3G on-board law enforcement systems, 3G individual law enforcement systems, 3G on-board hard drive recorders, and other applications. Video Signals and other data are transmitted over the carrier's network. The 3G product will greatly expand the scope of mobile monitoring, flexibly respond to all kinds of emergencies, and has the features of convenient ad hoc networking, strong mobility, and support for high-speed mobile, allowing network monitoring at any time.

Wi-Fi is currently mainly used for wireless monitoring of fixed points. wireless communication modules are installed in network cameras and video servers to achieve wireless transmission of short-range video data. If a base station needs to be set up for long distances, a targeted antenna is used. Wi-Fi transmission technology is mainly used in environmental protection, Oilfield, meteorology, water conservancy, land, mining, highways, electric power, security, and other industries, most devices are deployed in areas where personnel are difficult to reach or where cable cabling is difficult.

Due to the Construction of WiMax networks, the WiMax product market is rare. The primary cause is that the WiMax profit model is unclear for the moment. WiMax can only provide data services. Therefore, voice services must be provided using VoIP technology. Although WiMax has established an experimental network, there may be a long way to go in China. However, it is worth noting that WiMax is more suitable for HD video transmission.