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Abstract: There are a variety of wireless video surveillance equipment on the market, with prices ranging from hundreds to thousands. In the actual sales process of wireless monitoring equipment, customers often say that it has been unstable when using cheap equipment before. A penny for a price, a wireless bridge does not look at the appearance of the device, but mainly depends on the device parameters and functions.
There are a variety of wireless video surveillance equipment on the market, with prices ranging from hundreds to thousands.
In the actual sales process of wireless monitoring equipment, customers often say that it has been unstable when using cheap equipment before. For a price and a price, the wireless bridge does not look at the appearance of the device, but mainly the parameters and functions of the device. So how to make a stable wireless monitoring system?
In fact, the following points are mainly mastered, and approximate system solutions can be generated:
? System distribution: The distribution of the front-end surveillance camera points determines how the front-end wireless bridges are distributed. If multiple cameras can be concentrated, we can concentrate the signals from multiple cameras before transmitting. If they cannot be centralized, we can take multiple transmissions and receive one. Way to achieve wireless video transmission.
? Transmission frequency: Frequency band: 2.4G frequency band is used more and more interference, 5.8G frequency is relatively clean. Anti-interference: In addition to the first one, the 2.4G diffraction ability is strong, and the transmission distance in the building is far, and the transmission distance of 5.8G with the same power is greater, but the diffraction ability is poor. Use: 2.4G is used for network coverage, because most wireless network cards are in this frequency band, and 5.8G is used for transmission bandwidth.
The 802.11b / g standard works in the 2.4G frequency band with a frequency range of 2.400-2.4835GHz and a total bandwidth of 83.5M. Divided into 13 sub-channels, each sub-channel bandwidth is 22 MHz. IEEE
802.11a works in the 5.8G frequency band with a frequency range of 5.725G to 5.850GHZ, with a total bandwidth of 125M, and each channel has a 20MHz bandwidth 802.11G
The transmission is 54M, and the transmission speed of 802.11N can reach 300M.
Transmission distance: The transmission distance of wireless video surveillance equipment is 1 km, 2 km, 3 km, 5 km, 10 km, 20 km, 30 km, etc., so the distance of your transmission distance depends on which product you choose, and the cost is definitely It's different.
Line-of-sight conditions: All wireless monitoring systems must be in an open environment to achieve wireless video transmission. If there is obstruction, we must relay the front-end signal back to the monitoring center through relays, which can be repeated multiple times. Transfers are performed, but the more the number of transfers, the greater the delay.
? Transmission content: What is the signal of your camera, if the camera is an analog camera, your front end uses analog wireless monitoring equipment; if it is a network high-definition camera, your front end uses a wireless bridge to transmit, and the wireless bridge to transmit first looks at your camera How big is the bandwidth, and then we choose the product that suits you according to your actual situation.
Equipment performance: A good wireless bridge can't just look at the price, it mainly depends on the configuration of the wireless bridge, memory, flash memory, CPU and other parameters, but also what functions the wireless bridge has.
? Waterproof and lightning protection: A stable wireless video surveillance system depends not only on the choice of your front-end equipment, but also has a great relationship with whether the relevant waterproofing and lightning protection measures in your project are good, especially the waterproofing at the joints. Many customers will ignore problems, and lightning protection is also essential.