Wireless video surveillance equipment on the market is available in a variety of ways, ranging in price from a few hundred to several thousand. In the actual sales process of wireless monitoring equipment, customers often say that it is unstable when used with cheap equipment. One point for the price, the wireless bridge does not look at the appearance of the equipment, mainly depends on the equipment parameters and functions, how to do a stable wireless monitoring system? In fact, the main points are as follows: The approximate system solution 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 multiple cameras and then transmit them. If we can't concentrate, we can take multiple transmissions and one reception. To achieve wireless video transmission
Transmission frequency: Frequency band: 2.4G frequency band is used more, interference is more, 5.8G is relatively clean. Anti-interference: In addition to the first one, 2.4G has a strong diffractive ability, and the transmission distance in the building is far away. The transmission distance of 5.8G is the same under the same power without blocking, but the diffraction ability is poor. Use: 2.4G is used for network coverage, because most of the wireless network cards are in this frequency band, and 5.8G is the transmission bandwidth for transmission.
The IEEE 802.11b/g standard operates in the 2.4G band with a frequency range of 2.400-2.4835 GHz for a total of 83.5 M bandwidth. Divided into 13 subchannels, each subchannel bandwidth is 22MHz. IEEE 802.11a works in the 5.8G frequency band, with a frequency range of 5.725G-5.850GHZ and a total bandwidth of 125M. The 802.11G transmission of each channel 20MHz bandwidth 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 to choose, the cost is definitely Different.
Line-of-sight conditions: All wireless monitoring systems must be in an open environment to achieve wireless video transmission. If there is occlusion, we must relay the front-end signal back to the monitoring center through relaying. Transfer, but the more the number of transfers, the greater the delay.
Transmission content: What is your camera's signal? If the camera is an analog camera, your front end uses analog wireless monitoring equipment; if it is a network HD camera, your front end uses a wireless bridge to transmit, and the wireless bridge to transmit first look at your camera. How big is the bandwidth, and then we will choose the product that suits you based on your actual situation.
Equipment performance: A good wireless bridge can not only look at the price, mainly depends on the configuration of the wireless bridge, memory, flash memory, CPU and other parameters, but also what functions of the wireless bridge.
Waterproof and lightning protection: A stable wireless video surveillance system depends not only on the choice of your front-end equipment, but also on the waterproof and lightning protection measures in your project. Especially the waterproofing at the festival head is a lot. Lightning protection is also essential for customers to ignore problems.
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