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When wireless bridges are used in wireless monitoring, there are three types of networking and transmission methods: point-to-point transmission, point-to-multipoint transmission, and relay transmission. However, in practical applications, the relay mode is still relatively rare. First, it will increase the cost, and second, there is a certain loss of the signal. In the security monitoring system, due to cost and practical considerations, many wireless bridge point-to-multipoint transmission methods are used. So, what aspects of the point-to-multipoint wireless transmission mode should be paid attention to in the application?
1. Transmission distance
The description above also explains that point-to-multipoint is not suitable for situations where transmission is too far. Generally no more than 8 kilometers, preferably about 3-5 kilometers. The closer the distance, the better. If it is within 1-2 kilometers, you can consider omnidirectional 360-degree coverage. If the communication needs a long distance, then if the transmitting end and the receiving end are on the same communication link, then it is also feasible to make a point-to-multipoint.
2.Bandwidth issues
Also consider the bandwidth of the wireless bridge. Generally, the mainstream wireless bridges of Laian are 5.8G and 300M wireless bridges. The 5.8G frequency is relatively clean and has strong anti-interference ability. It can be used in most wireless monitoring applications. Of course, how to configure it depends on the bandwidth required for front-end transmission. In addition, there are 800M and 1000M high-bandwidth devices.
3, the issue of angle.
As we all know, all wireless bridges have a certain angle. Devices with a wireless bridge within 10 kilometers generally use a bridge with a built-in antenna for transmission. More than 10 kilometers before the external antenna. The receiving angles are 60 degrees, 90 degrees, 120 degrees, 180 degrees, etc., and can be configured according to the actual situation. The front end of the transmitting end of each angle range is better than 20 degrees.
4.Camera
If it is an analog camera, the transmission is an analog transmission device, which can only be a point-to-point transmission mode. Only when the front-end camera is a webcam, a point-to-multipoint transmission mode can be adopted. In addition, every time we will consult the customer about the pixel problems of the camera and the code stream, because if the pixel is larger, the bandwidth is greater. If the camera with too large pixel uses point-to-multipoint transmission, it may cause the receiving end The data load is too large, and there is a problem that it cannot be transmitted normally.
5. What proportion is appropriate
Although wireless bridges can perform point-to-multipoint transmissions, the transmission process pays attention to the issue of a ratio. It can be point-to-multipoint, which does not mean that it can be unlimited to many-point. In general, Lean recommends that the ratio of 1: 4 is good. If the ratio is too large, it may easily cause the problem of channel grabbing.
The above is the introduction of the precautions of wireless bridge in point-to-multipoint mode. For more wireless bridge knowledge and installation skills, please consult Tengyuan Zhituo, and we will provide you with more.