Some time ago, we learned from each other two key main parameters in the selection of monitor network switches: backplane bandwidth and packet forwarding rate. Many friends directly said: How do I choose an access switch when I use a wireless bridge for transmission? Also, how many megabytes of wireless bridge do I use to transmit the remote web surveillance camera? To be more straightforward, how many surveillance cameras can a pair of 200M wireless bridges transmit? Regarding this problem, I consulted a number of different manufacturers and collected some materials from the Internet. Let's talk with everyone today. It doesn't matter whether it is wireless bridge transmission monitoring or copper cable transmission monitoring. The monitor is the same as the application system, and is divided into three frameworks: the core layer, the aggregation layer, and the connection layer. We have talked about copper cables more than once before: the selection parameters of high-definition monitoring system switches. In fact, we can completely use the wireless bridge as a switch with its own access and upload ports. For example, two wireless bridges of 1.5KM200M can be understood as a 200M 'SZ' network switch. It's just that the transmission method has changed from the original copper cable to a wireless network. Now that it is an SG switch, then we will calculate according to the main parameters such as the connection and transmission of the 200M network switch. Let me talk about the bandwidth of compressed transmission of a single camera: The server bandwidth occupied by the surveillance camera can be considered by the video bit rate or bit rate. The common surveillance camera resolution specifications and models and the strongly recommended video bit rate standard values ​​are given in the table. This table refers to H.264 becoming smaller and H.265 becoming smaller. The way to reduce H.265 is about 40% up and down. For details, please refer to: H.264 has just learned a little, but it is not clear that a lot. ; Simple and clear, H.264 vs H.265 solid-state disk calculation method! During the operation of wireless surveillance transmission, the bit rate of the surveillance camera is all adjustable, and the video bit rate will be automatically changed when the natural environment is different: for example, the natural environment of the interface monitor in the daytime is relatively neat or static data Under the interface condition, the video bit rate is relatively low; while at night, the light intensity is low, the interface noise increases, and the unresponsive video bit rate will increase a lot. In addition, in the actual process, we generally design variable bit rate in order to achieve a better monitoring and monitoring effect. The bit rate reduction will definitely come at the expense of image quality or frame rate. After talking about the reduction of the transmission of individual surveillance cameras to occupy the network bandwidth, let's talk about the specific calculation method of the number of load surveillance cameras: Theoretical value: number of cameras = wireless bridge transmission bandwidth (200M) / camera transmission code rate That is: 200M / 8M (2 million pixel camera) = 25. You must be surprised: Wow, so much! But why can't we achieve such an effect in practice? The dynamic delay is very powerful and it is very easy to freeze, what is the matter? Quickly make up for it, and read the content of the previous article: talk about some common knowledge of wireless bridges; how to check the problems of wireless bridges and wireless monitoring equipment ?; do you know the mistakes of wireless bridges? After reading this, I have a general understanding and application of wireless bridges. I think that the transmission characteristics of the same bridge will decrease with the expansion of the transmission distance only from point to point. Besides, sometimes it will involve relay or a little more than a single point. There is the nominal transmission bandwidth of the wireless bridges of various manufacturers, which is the maximum rate that can be transmitted between the bridges under the test distance. The test environment is different, and the rate has a great impact. The difference between the wireless bridge and the wired transmission is that the wireless transmission is easily affected by external factors such as the environment, so you need to reserve a considerable part of the margin in the project, you know. Wireless bridge products are subject to environmental hazards such as rain attenuation, northern smog, and externality. Therefore, the selection of the wireless bridge's natural environment and functional test level is more important. In long-distance field transmission, 5G bridges are increasingly favored for their high transmission bandwidth and strong anti-interference ability, and gradually become the mainstream. Can refer to: What is the difference between 2.4G and 5.8G of wireless bridge; some applications of 5.8G wireless bridge. Knowing how many surveillance cameras can be transmitted by two wireless bridges, and then according to the bandwidth and packet forwarding rate of the network switch's backplane, people's aggregation switches can be deployed. In practice, we can easily plan the deployment of monitoring points and wired networks. Today we learned the simple algorithm and precautions of the number of cameras with wireless bridges. I think the wireless bridge is used as the transmission method of network signals. If people consider the following three points: choose the surveillance camera to occupy the network bandwidth (1.3 million, 2 million, 3 million); the relay distance (500 meters, 1000 meters, 2000 meters, 3000 meters); bridge characteristics (well-known brands, service items), you can design and conceive a complete set of wireless monitoring system. The monitoring and deployment of wireless networks and affluence are closely related to the difficulties of deployment, and the next phase will carry out statistical analysis of data with specific engineering construction processes. Ceramic Balls,Alumina Ceramic Ball,Inert Alumina Ceramic Ball,White Alumina Ceramic Ball Shanxi Ruineng Ceramic Material Co.,Ltd , https://www.rnceramic.com