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Comprehensive wireless bridge professional knowledge (1)

Author: Shenzhen Science and technology time: August 30, 2019 source: egibl.com
Abstract: many friends asked about the wireless bridge several times. Today, people have a comprehensive grasp of the relevant professional knowledge of wireless bridge. 1、 What is a wireless bridge? A wireless bridge, as its name implies, is a wireless network

Many friends asked about it several times wireless bridge Today, people have a comprehensive grasp of the relevant professional knowledge of wireless bridge.

 

1、 What is a wireless bridge

As the name suggests, wireless bridge is the bridge of wireless network. It uses wireless transmission to build a communication bridge between two or more networks. Wireless bridge can be divided into circuit bridge and data bridge from the communication mechanism. Wireless bridges are usually divided into 2.4G and 5.8G The other two frequencies must be able to apply after authorization.

 

2.4G Bridge:

It has the advantages of low frequency, long wave length and strong diffraction ability. In short, the propagation performance is good, and the propagation path is not affected by slight occlusion. And the cost is relatively low. The flaw is the application 2.4G There are many machines and equipment in the frequency band, and the radio wave data signal at the transmission point of the bridge is very easy to be distorted by the data signal of other machine equipment transmitting point, which leads to the transmission quality degradation. Furthermore, it is subject to 2.4GHz  Frequency band itself   The bandwidth of the transport network, usually no more than 400Mbps

 

5.8G  Bridge:

The advantages are high frequency, relatively pure channel and large transmission bandwidth. Transmission bandwidth 300 Mbps Start, easy to reach 1Gbps above. The appropriate application of scenario data transmission. The disadvantages are high frequency, short signal wavelength, poor penetrability and no occlusion during transmission. 5.8G The cost of equipment is higher than 2.4G It is still in the promotion stage.

 

2、 Working principle of bridge

Wireless bridge transmission system is usually composed of two or more wireless devices. Due to the two-way transmission of data, each device needs to have the ability to receive and receive wireless signals. The working principle of wireless bridge is that the bridge uses air as the medium to transmit signals. In short, one end of the bridge converts the signal in the network cable into wireless electromagnetic wave signal and sends it into the air. The bridge at the other end has the opposite effect. It receives wireless electromagnetic wave signals in the air and converts them into wired signals. Wireless electromagnetic wave signal can be transmitted by air as transmission medium, which can solve many difficult problems in wired deployment construction, such as highway, river, mountain stream barrier, or road hardening, cable deployment and construction difficulty. Outdoor wireless AP Detailed installation steps, wireless bridge networking has obvious advantages, can be in the fifty Km distance to achieve point-to-point or point to multipoint network connection, data transmission speed up to 108Mbps Effectively solve the problem of network connection between sections , As long as the wireless signal coverage area, the client can easily access the network and integrate the system , Without any wiring, the wireless terminal can achieve zero configuration access, so it is very easy to maintain and expand the network. The network bridge is usually used as the following scenarios: wireless data acquisition, monitor transmission data (outdoor and elevator car), outdoor wireless coverage, outdoor long-distance wireless bridge, personal ISP Wireless broadband, unattended monitoring station statistics, etc.

 

3、 How to choose the right bridge

Wireless bridge is a common wireless monitoring transmission equipment in the field of wireless monitoring AP Wireless router is also a wireless device, but it is not used to build wifi  Instead, it's used to transmit video data wirelessly   The wireless bridge is the key transmission equipment in wireless monitoring, which is used in outdoor monitoring video transmission and elevator car monitoring video transmission. There are so many kinds of wireless bridges in the market. How to choose a suitable bridge? We will answer from the following aspects.

 

one Transmission distance

Wireless monitoring new projects must carry out the transmission distance is different, the transmission distance of wireless bridge is also many kinds of variety, some transmission 1~3 Kilometers, some transmissions 3~5 Kilometers, some transmissions 5~10 Kilometers, some transmissions twenty It is necessary to determine the transmission distance of the monitor according to the transmission distance of the monitor. The larger transmission distance of the bridge should exceed the transmission distance of the monitor as far as possible. Because the temperature of rain, fog and snow in the specific application scenario will reduce the transmission characteristics of the bridge, sufficient characteristic capacity should be embedded in the construction project.

 

two Transmission bandwidth

There are many kinds of wireless bridge transmission rates, such as 150Mbps 3000Mbps 450Mbps 600Mbps 900Mbps The selection of the rate can be determined according to the requirements of wireless monitoring. Users need to consider the transmission performance of the bridge in a specific distance, rather than the theoretical bandwidth data. For example, SF-5800AC The basic theory of bridge transmission network bandwidth is 866Mbps In two The bandwidth of point-to-point communication network reaches 400 km Mbps , load  20 individual 150W  The monitoring camera has no working pressure.

 

three Working frequency

There are two main operating frequencies of wireless bridges, 2.4G and 5.8G The characteristics of the two bridges are different. Usually, 2.6G Wireless bridge is popular in today's frequency band, with good compatibility mode and good diffraction ability, but its anti-interference ability is relatively poor, especially in urban areas WiFi The mechanical transmitting point of the network. 5.8G The transmission distance is far, but the diffraction ability is poor. Urban area, downtown, long-distance transmission, large video stream 2.4G More interference, choose 5.8G Wireless bridge. Other such as transmission distance is closer, more remote, less interference with the same frequency 2.4G Wireless bridge for

 

four , antenna

Antenna is an important part of wireless bridge, which is used to transmit and receive wireless signal. Without antenna, wireless bridge can not realize communication. There are many kinds of antennas, including omnidirectional antenna and directional antenna. Omnidirectional antenna is used to cover and transmit in short distance. Directional antenna should be selected for long-distance bridge, and the greater the antenna gain, the better the characteristics of wireless bridge.

 

five Power supply mode

The working environment of wireless bridge usually involves some complex outdoor environment, such as forests, ports, tunnels, reservoirs and other places, so power supply is a more troublesome problem. Selection and Application POE The wireless bridge of network line power supply system can deal with this problem very well. Bridge all applicable PoE  The distance between power supply systems is up to sixty-five Rice.

 

six Protection level

wireless bridge Weather, weather, weather, weather, weather, weather, etc. A qualified wireless bridge, these "qualities" are necessary.

 

seven , matching method

At present, there are three main matching methods of bridge: key pairing, dial pairing and automatic pairing. As far as the simplicity of engineering application is concerned, especially the project of installing dozens of bridges at one time, automatic matching is undoubtedly the best choice. The bridge is suitable for automatic matching when the two bridges are plugged in, which can greatly relieve the workload.

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