Security camera communication module Long-distance wireless communication module broadband calculation and transmission mode, in the monitoring system, whether it is wired transmission or wireless transmission, monitoring and network systems are divided into three architectures: core layer, aggregation layer and access layer. In the wireless bridge monitoring system, the transmission bandwidth is very important. Therefore, at the beginning of system construction, we should accurately calculate the wireless transmission bandwidth in order to better distribute points and build the system. Today, let us understand how to calculate the transmission bandwidth of wireless.
In fact, we can think of wireless as a switch with its own access and upload ports. For example, a pair of long-distance wireless communication modules can be understood as a 2000m fool switch. It's just that the transmission method is wireless. Since it is a switch, you can test according to the access, upload and other parameters of the 2000m switch.
Let's take a look at the bandwidth occupied by the compressed transmission of a single camera of the long-distance wireless communication module: the network bandwidth occupied by the camera of the security camera communication module can be measured by the code stream or code rate. In actual operation, the bit rate of the camera can be adjusted, and different external environments will also change with the change of the bit stream: for example, when the image monitoring environment is relatively clean or static during the day, the bit rate is relatively low; at night, the bit rate is relatively low; The illumination is lower, the image noise increases, and the response code stream will increase a lot. In addition, in the actual process, we usually design it as a variable bit rate to achieve better monitoring effect. Lowering the bitrate will definitely sacrifice image quality or frame rate.
The bandwidth occupied by the compressed transmission of a single camera is completed. In fact, the calculation formula for the number of load cameras is as follows:
Theoretical value: the number of cameras = the transmission bandwidth of the long-distance wireless communication module (2000M) / the transmission code rate of the camera. That is 2000M/8M (2 million pixel camera) = 250.
Many users here will be surprised: security camera communication module since you can bring so many cameras. So, why is this effect often not achieved in practical applications? In fact, the transmission performance of the same network only degrades as the transmission distance increases, sometimes involving bridge connections or one-to-many points.
Another point is the wireless transmission bandwidth that the manufacturer of the long-distance wireless communication module claims, which is the maximum transmission rate between the bridges under the test distance. Different test environments have a big impact on the rate.
The difference between the long-distance wireless communication module and the wired transmission is that the wireless transmission is susceptible to external factors such as the environment, so you need to keep a considerable margin in the project, as you know. The product is greatly affected by the environment such as rain, northern haze, and external temperature. Therefore, the selection of the installation environment and performance test of the long-distance wireless communication module is particularly important.
Find out how many surveillance cameras a pair of long-distance wireless communication modules can transmit, and then deploy our wireless switches according to the switch's backplane bandwidth and forwarding rate.
In fact, we can easily deploy and plan surveillance points and wired networks, and simple algorithms can know the number of wireless networks and cameras. The wireless network bridge is the transmission method of network signals. In order to design a perfect wireless transmission system, professional technicians only need to consider three points: the bandwidth occupied by the camera, the transmission distance, and the performance of the network equipment.
When building a wireless transmission system, equipment technicians will select the corresponding transmission mode according to different on-site environments. Many friends who have just come into contact with wireless network bridge transmission equipment are not very clear about their wireless transmission mode. Today, Xiaobian will tell you five wireless network transmission modes and their characteristics of the security camera communication module.
1: Accesspoint (pure AP mode)
Pure AP access point mode, supports 802.11b11MBPS or 802.11b+22MBPS wireless network card access.
2: WirelessClient (bridge mode)
Bridge mode to connect any AP bridge. Use SiteSurvey (signal search) to search for the SSID of the other party's AP or wireless router, and then click Connect to connect, it's that simple!
3: Wirelessbridge (AP to AP wireless bridge)
Support two APs in wireless bridge mode to connect two different LANs. To set the bridge mode, you only need to fill in the MAC code of the other party's AP into the Wirelessbridge item of your own AP. This mode will no longer send wireless signals to other wireless clients.
4: Multi-pointbridge (multi-AP bridge)
Support more than two APs for wireless bridging, select APMultiplebridge (multi-AP bridging) at the central location, and then other APs uniformly fill in the APMAC code of the central location into their Wirelessbridge items.
5: Repeater (wireless signal repeater)
Just use the application Repeater (wireless signal relay), and then use the Sitesurvey (signal search) of the Wirelessclient item to search for the SSID of nearby APs or other wireless routers, and then copy the MAC of the other AP or wireless router to the RepeaterremoteAPMAC column of the AP .
After understanding the transmission method of the above-mentioned long-distance wireless communication module, I believe that many users have a deeper understanding of the security camera communication module. For how wireless communication is applied to wireless transmission projects, users can pay attention to us, and we will promote more professional knowledge for you.
