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The application of wireless video surveillance projects is always worrying. Many people are not fully involved in the application of the equipment, such as equipment costs, installation costs or line costs, but there are many areas that need attention in the installation of the project. Summarized as follows:
Network security issues: System security is especially important because wireless video surveillance systems may involve content such as public privacy and social security. Wireless networks use microwaves as the transmission medium and are easily stolen by others, affecting the security of the entire system. Where, after installing wireless video surveillance, it is necessary to encrypt the wireless device. Leyan Wireless Bridge has encryption capabilities.
The use of the operator line problem: The three major mobile system operators in the country have opened a 3G wireless private network for the industry users, which is divided into APN private network, VPDN private network, and optical cable dedicated to adopting dedicated accounts, mostly fixed IP addresses on the internal network. Whether or not you can completely isolate the links between the Internet and whether you can avoid the effects of viruses and hackers cannot be ignored. Lehmann wireless bridges are autonomous LANs, do not need to use mobile networks, and will not conflict with these operators.
Radio signal reception problem: The disconnection problem of wired networks is mostly attributed to operators. In the future, when users start to pursue large-scale cloud monitoring, how to easily and quickly connect networks is the key. That is, the use of 3G/4G, satellite, and cable network (ADSL/FTTB), or even the current wireless Internet access, is the backbone of the Internet. Therefore, having a variety of backbone network link capabilities and having "automatically integrated with the cloud" wireless devices is particularly important.
Bandwidth Limitation: Currently, wireless mobile network monitoring in China mainly uses CDMA, GPRS based on GSM, and CDMA/GPRS based on public network. Due to the limited bandwidth, the image quality is limited. Even with the multi-path binding technology, the CIF-level definition can only be achieved at most. For emergency command handling emergency, it is not recommended to use CDMA/GPRS technology, because although it can meet the actual transmission capacity needs, its transmission stability still needs to be improved. This is because the transmission of CDMA is related to its coverage. The areas with poor coverage of signals have poor results. The areas covered by good signals are very effective. That is to say, the same set of equipment is used very well in Shenzhen, and it will be in Guangzhou. May not work well. Even if the signal coverage of a certain area is good, if the public network signal is abnormally busy in the event of an emergency, under the principle of operating traffic priority, the image transmission has to “stand byâ€. When most major emergencies occur, the base station is almost fully loaded. To use it for network image data transmission, there are real problems. In other words, the more urgent, the more difficult the mobile network is to support the wireless transmission of images. Lyon wireless transmission equipment has 300M, 800M equipment, according to the front-end camera configuration or data required bandwidth configuration.
The problem of video delay: Image delay is also where users often fall ill. In the case where the wired network has not significantly improved the network environment, many suppliers have already heard such comments. System integrators may be able to reduce the number of smart gadgets on the AP by purchasing specific devices. these questions. For example, at present, many manufacturers have introduced wireless AP products with dual RF modules, which can be used both as an AP and a client, and it is also possible to set the channel for 2.4G or 5G depending on the situation, so as to avoid the congestion problem of the bandwidth. When two channels transmit the same channel at the same time, they have the data backup effect to ensure that the data does not leak. The delay of the Leion Wireless Bridge is very small, within 10 milliseconds, and it is almost negligible.
Data transmission encryption problem: Because the hacker may use the operator private network to attack the wireless monitoring network system, the data transmitted over the wireless monitoring network needs to be encrypted. At present, the encryption method mainly used is the VPN (virtual private network) technology. This technology constructs a secure encryption channel between the wireless terminal and the center server, which is relatively mature but has certain requirements for the processing capability of the wireless terminal CPU.
The above must pay attention when using and constructing the wireless monitoring network, and it needs more careful consideration. So if wireless applications have disadvantages and disadvantages, they will not use them? Not necessarily, wireless monitoring systems have many advantages in application. And it is gradually becoming a trend.
Leian wireless monitoring, professional ten years, providing program design, product configuration and so on. If you have any problems with wireless monitoring solutions, you can call Levin’s staff.