What are the characteristics of video surveillance systems for wireless bridges?
The wireless bridge is the same as the wireless network AP, all of which are wireless transmission devices. The difference is that the wireless network AP is used for wireless coverage (WiFi), and the wireless bridge is used for video surveillance system (wireless monitoring). The following is a detailed description of the professional knowledge of the video surveillance system of the wireless bridge in the application scenario by the transmission product & service provider Wacker Communication.
First, what is a wireless bridge
A wireless bridge is a bridging device for a wifi network. It uses a wireless data transmission method to maintain a highway bridge between two or more Internets and can transmit data from one Internet to another.
In wireless monitoring, wireless bridges are used as Internet highway bridges for wireless surveillance video signal transmission, which is equivalent to this suspended and folded invisible network cable, thereby eliminating the need for each section of the cable (network cable) to promote the construction of buildings. For simplicity.
Wireless bridges cannot be used alone. One-to-one or English one-to-one applications are required. There must be a transmitting point end and a receiving end to enable detailed transmission of wireless network statistics.
Second, several types of application methods of wireless bridges in wireless monitoring
1. Point-to-point application
Point-to-point means that one transmitting point matches one receiving point, that is to say, the application of the wireless bridge 1 to 1 is a very simple networking solution. Two-point wireless antennas must be placed relative to each other to exceed the actual effect.
This method is suitable for roadblocks, few roadblocks, or close visibility gaps. In this mode, the loss is the smallest, and the monitoring data transmission effect is the best. If it is an analog camera, this method is the only option.
2, relay mode
It is a short-circuit transmission method. A wireless bridge must be used as a "repeater". It is usually used for wireless data transmission between two buildings that cannot be viewed immediately, or there is a roadblock (short-circuit bypass roadblock). ).
The data signal must be transmitted from point A to point B, but there is a building (C) in the middle, but it is unwilling to change other relative paths. At this time, residents can install another wireless bridge in this building The data signal at point A is first transmitted to C and then to B, which is equal to one more in the middle.
Because the data signal and its transmission have necessary losses under this method, the relay mode should be used less often, or it should be used in situations where the bandwidth of the transmission network is not high and the spacing is short.
3. Point-to-multipoint application
This networking scheme is widely used in wireless monitoring and must be a network camera. Several transmitting points match one receiving end. For example, the front-end development has several wireless bridges to transmit the monitor statistics of several surveillance cameras, and then gathers them to the receiving wireless bridge to transmit them to the monitoring system.
This method is suitable for monitoring. Pay special attention to the fact that the angle of view in the middle of the two transmitting points cannot be too large, and it is generally maintained at 20 degrees. The front-end development can not transmit the transmission distance between the transmitting point and the receiving end. The transmission external chain is on the same line, which can ensure the reliability of the transmission picture quality; the clarity of the surveillance camera applied need not be very large.
When applying the point-to-point method, pay attention to: transmission distance, transmission network bandwidth, transmission safety channel, etc., you may also have to choose the bridge machine equipment flexibly according to the situation on the spot.
Third, the application environment of wireless bridge
The wireless bridge is generally used outdoors, suitable for connecting two Internet, a pair of application wireless bridges, one as the transmitting point end, and the other as the receiving end, transmitting data according to the gas.
At the time of the new monitor project, to prevent the problem of hanging wires and routing, if the scope of the monitor is not large, the monitoring equipment is relatively centralized, and the wiring is very simple, usually the rich monitor is not much difficult. If the total area of ​​the monitor is large, the positioning points are scattered, and the troublesome cable routing (mountains, water conservancy hubs, mines, etc.), it will be a headache to be a rich monitor. Using a wireless bridge to set up wireless monitoring is much simpler.
When outdoor wireless bridges are used, we must pay attention to problems such as the natural environment and wireless antennas. The greater the transmit power of the wireless antenna, the farther and farther the transmission distance becomes. Two 12dbi directional antennas can maintain a 2km point-to-point microwave heating interconnection, and 27dbi directional antennas can maintain a 10km point-to-point microwave heating interconnection. Fourth, the characteristics of the monitoring system based on wireless bridge
The wireless bridge raises the wireless communication technology to a new level and is widely used in wireless monitoring engineering projects. Using the wireless bridge to create a wireless monitoring Internet, deployment staff will get a very convenient and easy-to-use solution. Compared with FusionExcel, wireless monitoring has the advantages of safe and convenient engineering projects, no wiring restrictions, and reduced costs.
1. High flexibility
Today's intelligent security regulations have no dead zone video surveillance system. Wireless monitoring is not limited by cables. It has flexible scalability, can easily add new monitoring equipment at any place, anytime, anywhere, and can change the old monitoring The systemic risk of the device, so that the security monitoring system is truly implemented.
2. Low cost
Only one project investment is required, and the wiring is low-cost. There is no need to hire a technical professional construction team, and there is no need to dig through the pipe. Wireless monitoring can solve the constraints of the cable. It has the advantages of short safety cycle time, convenient maintenance, strong ability to expand work, and quick cost recovery.
3. Short construction cycle and easy maintenance
As a result, FusionExcel monitors are limited by the topography and office environment, and the project construction cycle time is very long, and even some local wiring projects cannot be maintained. At this moment, wireless monitoring is used to solve the constraints of the cable in a variety of ways, and it is easy to implement security.
4. Wide application range
Can be used in a wide range of coverage, scattered security prevention, traffic monitoring, industrial monitoring, home monitoring and many other industries. Such as wireless monitoring of ATMs, bank tellers, shopping malls, processing plants, etc., nursing care, kindergartens, universities show remote control wireless monitoring services and so on.
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