1. The bridge implements LAN interconnection at the data link layer;
2. The bridge can interconnect two networks with different data link layer protocols, different transmission media and different transmission rates;
3. The bridge realizes communication between the interconnected networks by means of receiving, storing, address filtering and forwarding;
4. The network connected to the bridge must use the same protocol above the data link layer;
5. The bridge can separate the broadcast traffic between the two networks, which will help improve the performance and security of the interconnection network.
The wireless bridge can carry out long-distance data transmission through wireless, and is mainly used for interconnection between wireless or wired LANs. When there is difficulty in achieving wired connection or using wired connection between two or more local area networks, a wireless bridge can be used to implement the connection, and the wireless bridge is responsible for network routing and protocol conversion. According to different protocols, wireless bridges can be further divided into IEEE 802.11b/g wireless bridges operating in the 2.4G band and IEEE 802.11a wireless bridges operating in the 5.8G band. The antenna used corresponds to a 2.4G antenna and a 5.8G antenna. Wireless bridges can use bridging methods such as point-to-point, point-to-multipoint, and trunk connections, and are widely used in the interconnection of networks between different buildings, and even in the interconnection between multiple branches and networks in neighboring cities and towns. The specific applications of wireless bridges include the following three aspects:
The first type is in a large campus or factory area. The distance between buildings and buildings in such areas is often more than 100 meters. If a cable connection is used, it usually requires the laying of optical cables, but whether it is an excavation road or erection Blank lines are costly and laborious, and using wireless bridges to interconnect networks is economical and convenient.
The second is to connect different branches and sub-branches in some neighboring urban areas. The previous practice was often implemented in the form of a leased line. This method requires expensive leased line fees every month, and the bandwidth is generally wired. For 64kb/s-2Mb/s, if using a wireless bridging scheme, it will not only save expenses, but also increase the data transmission rate to several Mb/s or even tens of Mb/s. The required antenna of the bridge can also be used according to different needs. Select directional antennas with different gains.
The third type is temporary venues, such as outdoor performances or stadiums. A live network connection can be established by setting up a wireless network bridge at the site. For large-scale outdoor activities such as news webcasting, due to the temporary and unfixed nature of venues, if traditional cable is used to arrange network cables at the live broadcast site, not only is the wiring and maintenance difficult, but it also brings a lot of trouble to the on-site network management. Wireless bridges in these occasions show irreplaceable advantages. Wireless bridges generally do not have their own antennas and need to be equipped with antennas (orientation). Parabolic antennas are generally used for long-distance point-to-point connections. The distance of wireless bridge transmission distance depends on the environment and the antenna. Under the condition of no big obstacles, a pair of 27dBi 5.8G directional antennas can achieve 20km of point-to-point microwave interconnection.
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