Obviously, the wireless network bandwidth is far less than the wired network. In the wired network system, the available bandwidth of the video surveillance system can easily reach 70Mb/s to 700Mb/s. In wireless network systems, the usual bandwidth is not higher than 5Mb/s to 25Mb/s. It is often easy to ignore bandwidth when designing wireless video surveillance. The bandwidth provided by wireless video surveillance tends to be significantly lower than the bandwidth standards they identify. This is because the bandwidth in the wireless system is calculated in comparison with the traditional wired bandwidth. For wired networks, if the bandwidth is 100Mb/s, that means you have 100Mb/s uplink and downlink rates. In a wireless network, if the bandwidth is 11Mb/s, it usually means that the total bandwidth of its uplink and downlink is 11Mb/s. Some wireless systems are set to have half of the total bandwidth for upstream and downstream respectively. There is a problem that easily arises here because the bandwidth used by video surveillance is generally one direction (upstream). If necessary, make sure that your wireless system's upstream bandwidth occupies the entire bandwidth.
In addition, environmental factors often affect bandwidth, and wired networks are much less affected by the environment than wireless networks. Only when the wireless network signal is strong can it achieve its standard bandwidth. If there are any obstacles or the antenna is slightly moved, the wireless network signal may be significantly attenuated. For example, an 11Mb/s wireless network can only provide 5.5Mb/s bandwidth for video streams. However, the wireless network bandwidth in the environment is probably only 2.75Mb/s.
Second, the distance between cameras
If you want to deploy links to video surveillance cameras within a few miles of a wireless network, this is quite difficult. There are many factors that need to be taken into account: obstacles, frequency, power supply, and management platform installation. However, what this article is talking about is the frequency of unlicensed (public) - the solution most current deployments of wireless video surveillance systems say. If you want to use the licensed frequency (private), then you can use more powerful power to ensure there is no interference. However, obtaining a licensed frequency is time consuming and costly, so most of them use unlicensed frequencies. What is discussed below is the category of unlicensed frequencies only.
No matter how strong your signal is, they will be attenuated by the transmission distance. The national standard strictly limits the effective coverage of the signal, so in the same scope, you will certainly encounter the phenomenon of signal crossover. However, this also means that it is difficult to avoid obstacles. It also means that your signal can be transmitted to more distant areas. These users who use the same frequency as you, may weaken or even interfere with your signal transmission. For users using the 4.9GHz frequency range, this effect is even more pronounced because 4.9GHz is the frequency used by public safety.
Obstacles are a very important issue for wireless video surveillance systems. Most wireless video surveillance systems use the commonly used frequency range (2.4GHz to 5.8GHz), and these frequency ranges are easily disturbed by buildings and trees. Maybe you want to transmit the video surveillance signal to another building 100 meters away, but if there are other buildings in the middle, the signal will be blocked or even the link will not be available. In this case, you can and should use a mesh network to solve the problem. However, you have to consider the increase in overall network costs brought about by this.
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