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What is the bridge <br> <br> bridge (Bridge) as a smart repeater. Repeaters receive signals from a network cable, amplify them, and send them to the next cable. In comparison, bridges are more sensitive to the information uploaded from the level. A bridge is a technology that forwards frames. According to MAC partition blocks, collisions can be isolated. Bridges connect multiple segments of the network at the data link layer.
Bridges, also known as bridges, are a type of storage/forwarding device that connects two LANs. They can split a large LAN into multiple network segments, or interconnect two or more LANs into a single logical LAN, enabling LANs. All users have access to the server. Bridges connect two similar networks and manage the flow of network data. It works at the data link layer, not only can expand the distance or range of the network, but also can improve the performance, reliability and security of the network. After network 1 and network 2 are connected via a bridge, the bridge receives the data packet sent by network 1 and checks the address in the data packet. If the address belongs to network 1, it will give it up. On the contrary, if it is the address of network 2, it will Continue to send to network 2. In this way, you can use the bridge to isolate information and divide the same network number into multiple network segments (belonging to the same network number). This isolates the security network segment and prevents unauthorized users from accessing other network segments. Because of the segmentation of the network, each network segment is relatively independent (belongs to the same network number), and the failure of one network segment will not affect the operation of another network segment.
What is a wireless bridge
Wireless bridges, as the name suggests, are bridges of wireless networks. They use wireless transmission to bridge the communication between two or more networks. Wireless bridges are divided into circuit bridges and data bridges from the communication mechanism. The circuit bridge wireless transmission mechanism adopts the PDH/SDH microwave transmission principle. The interface protocol is implemented by bridging principle. It has the characteristics of stable data rate and small transmission delay. It is a converged network solution suitable for multimedia applications and is suitable for use as a 3G/4G. Mobile communication base station interconnection and intercommunication. 
The data bridge adopts the IP transmission mechanism. The interface protocol is implemented using the bridging principle. It has the characteristics of flexible networking and low cost. It is suitable for network data transmission and low-level surveillance image transmission. It is widely used in all kinds of data based on pure IP architecture. Network solution.
Wireless bridge and microwave transmission difference 1, from the frequency above to divide the wireless bridge now apply only two frequency bands one is 2. 4G Another is 5. 8G, and we mentioned microwave products more frequency bands, microwave is Refers to radio waves in the frequency range of 300 MHz to 300 GHz. In fact, this wireless bridge is also within the microwave frequency range, but it has given it a good name.
2, the transmission distance is different, the wireless bridge transmission distance is very short, generally in the 3-5 km distance, and the microwave product transmission distance is relatively long, this need to be determined according to the actual situation, Generally, when designing a hop link, it needs to be surveyed or tested in advance. For example, there are 30 kilometers, 50 kilometers, and a short distance of 1 kilometer. This is divided according to the size of the antenna and the frequency band you choose. . 
3, the diffraction function is different, the microwave is basically no diffraction function, the higher the frequency the diffraction function is weaker, so in our microwave engineering case far distance will need a microwave repeater, also Is the microwave relay, here about the diffraction function, 2. 4G wireless bridge has a certain diffraction function, for example, you put a wireless bridge in a room, in another room can receive signals, signals Just weakened some. The microwaves we mentioned need to be in a direct-view mode, that is, they can be seen by our naked eyes for a short distance, or can be seen by a certain instrument at a long distance, such as can be seen through a telescope.
4, the setting method is different, this is basically the same, the current equipment is basically a fool-style, and most manufacturers have done the simplest settings in the factory, as long as other conditions are available, set in the above One or two parameters can pass, this is not difficult.
5, use different, almost the same use, can transmit video, audio and data signals, but in 2.4G wireless bridge can be used alone as a wireless AP to achieve wireless signal transmission. The microwave has no such function.
Application <br> <br> how to use a wireless bridge will be set up in practice, then this program is recommended to set up several adoptable:
Peer-to-peer point-to-point type (PTP), ie "direct transmission". Wireless bridge devices can be used to connect two fixed networks located in different buildings. They generally consist of a pair of bridges and a pair of antennas. The two antennas must be relatively oriented. The outdoor antenna and the indoor bridge are connected by cables. The bridge and the network are physically connected. 
Relay mode is "indirect transmission." BC is not visible between two points, but they can be viewed indirectly through an A building. And two points AC, BA between two points to meet the requirements of bridge equipment communications. Relay mode can be used. Building A acts as a relay point. Each BC placed bridges and directional antennas. Point A can be selected as follows: I place a bridge and an omnidirectional antenna. This method is suitable for situations where the transmission bandwidth is not high and the distance is short. II If point A is a point-to-multipoint wireless The bridge can insert two wireless network cards on the wireless bridge at the center point A. The two wireless network cards respectively connect two antennas through the feeder, and the two antennas respectively point to the B network and the C network; two bridges and two directions are placed on the III network. antenna.
Point-to-multipoint transmission Because wireless bridges are often due to special requirements when building a network, it is difficult to find power supplies nearby. Therefore, it is very important to have PoE (Power over Ethernet) capability, such as support for 802.3af international standard power over Ethernet, which can provide 12V DC power for the bridge through Category 5 lines. The general bridge can be managed through the Web or managed through SNMP. It also has advanced link integrity detection capabilities. When it is used as an AP, it can automatically detect whether the uplink Ethernet connection is working properly. Once it finds that the uplink line is disconnected, it will automatically disconnect the wireless connection. Workstations, thus disconnected workstations can be discovered in time, and search for other available APs, significantly improving the reliability of the network connection, and also provide convenience for the timely locking and troubleshooting. In short, with the maturation and popularity of wireless networks, the application of wireless bridges will also be greatly popularized.
Application Environment A temporary network of one-speed networking and field operations without major obstacles (peaks or buildings). Its effect distance depends on the environment and the antenna, which is now 7km of point-to-point microwave interconnection. A pair of 27dbi directional antennas can achieve a 10km point-to-point microwave interconnection. 12dbi directional antennas can achieve 2km of point-to-point microwave interconnections; a pair of wireless bridges that only implement link layer functions are transparent bridges, and with network layer functions such as routing, directional antennas at the network 24dbi can realize heterogeneous The Internet-connected device is called a wireless router and can also be used as a third-tier bridge.
Wireless bridges are usually used outdoors, and are mainly used to connect two networks. It is not possible to use only one wireless bridge, and two or more point-to-point links are required. The AP can be used alone. The wireless bridge has large power, long transmission distance (up to about 50km), strong anti-interference ability, etc. It does not have its own antenna and is generally equipped with a parabolic antenna to achieve long-distance point-to-point connections.
There are now 802.11n wireless bridges on the market, and the transmission rate can reach more than 300Mbps. However, due to a variety of factors, the actual rate is far lower than the value advertised by the business. However, the rate does increase a lot compared to 11g, which also makes it possible for us to demand high bandwidth and high transmission rates. With the continuous development of technology, it is believed that more new products will emerge as new technologies emerge.
What is a wireless bridge? Wireless Bridge Application in Monitoring Field
With the development of technology, the technology of wireless broadband network is more and more mature, and more and more applications are being applied in various fields. At present, the establishment of large-scale internal monitoring systems in enterprises has become a large-scale factory, mining enterprise and park in China. The important target of the informatization construction of scenic spots, roads, etc., based on the WLAN technology built wireless monitoring system, is not only relatively low investment cost compared with traditional monitoring systems, but the industry has unparalleled technical advantages. Such as network flexibility, support for mobile monitoring. High scalability, etc., make it the first choice for enterprises to establish internal monitoring systems. Wireless monitoring can choose analog cameras or IP cameras. If you choose analog cameras, you need to install an online video server.