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One concept
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 using the 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 by 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.
Second, characteristics
In addition to the basic features of the wired bridge described above, the wireless bridge works in a 2.4G or 5.8G wireless license-free band, making it easier to deploy than other wired network devices.
Third, the transmission of data
The data bridge transmission rate varies according to the adopted standard, as follows:
The wireless bridge transmission standard often adopts 802.11b or 802.11g, 802.11a and 802.11n standards, the data rate of the 802.11b standard is 11Mbps, and under the premise of maintaining sufficient data transmission bandwidth, 802.11b can usually provide practicality of 4Mbps to 6Mbps. Data rates, while the 802.11g, 802.11a standard wireless bridges have 54Mbps transmission bandwidth, the actual data rate up to 5 times 802.11b, the current transmission bandwidth through turbo and Super mode up to 108Mbps; 802.11n Usually can provide 150Mbps to 600Mbps transmission rate.
The bridge-type circuit transmission rate modulation scheme and bandwidth different determinants, PTPC400 up to 64Mbps, PTPC500 up 90MBPS, PTPC600 up to 150Mbps; can be configured carrier-class E1, E3, STM-1 interfaces <br> <br> IV. Application Environment
In the absence of a major obstacle (mountain peaks or buildings), temporary networking of a pair of speed networking and field operations. 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, while directional antennas with routing and other network layer functions can achieve heterogeneous real-time implementation on the network 24dbi. The Internet-connected device is called a wireless router and can also be used as a third-tier bridge. The wireless bridge is suitable for the environment that cannot be wired in the forest fire prevention and early warning of the construction site elevator factory.
Fifth, the typical application of wireless bridge
Wireless coverage point-to-point bridging, wireless relay point-to-multipoint bridging wireless bridges are usually used outdoors, mainly used to connect two networks, using a wireless bridge can not be used only one, point to point must be more than two, and AP can be alone use. 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 already 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.
How to use the wireless bridge in the actual application of the wireless bridge will be set up, and then recommend several possible deployment options:
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, and 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 to wireless bridges is often due to the special requirements of building a network, making it difficult to find power supplies nearby. Therefore, it is very important to have PoE (Power over Ethernet) capability, such as support for the 802.3af international standard for Power over Ethernet, which can provide 12V of DC power to the bridge via Category 5 lines. General bridges 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 detects an uplink disconnection, it will automatically disconnect the wireless connection. Workstations, thus disconnected workstations can be discovered in time, and search for other available APs, which obviously improves the reliability of the network connection and also provides convenience for locking and troubleshooting problems in time. In short, with the maturation and popularity of wireless networks, the application of wireless bridges will also be greatly popularized.
VI. Working Methods of Wireless Bridges These separate network segments are usually located in different buildings, located within a few hundred meters to several tens of kilometers away. So it can be widely used in the interconnection between different buildings. At the same time, according to different protocols, wireless bridges can be divided into 802.11b or 802.11G or 802.11GN in the 2.4 GHz band and 802.11a or 802.11an wireless bridge in the 5.8 GHz band. Wireless bridges have a variety of working methods. Each difference is slightly different, but the principles are the same: bridges, APs, APCs, pass-through clients, relay modes, routing modes, and so on. Especially suitable for close distance and long distance communication in cities. It has two kinds of access methods, IP interface access, IP + E1 dual interface access.
The wireless bridge is the bridge of the wireless network. It uses the wireless transmission to realize the bridge between two or more networks. The wireless bridge is divided into the circuit bridge and the data bridge from the communication mechanism. In addition to the basic features of wired bridges, wireless bridges work in 2.4G or 5.8G license-free bands, making them easier to deploy than other wired network devices.
What is a wireless bridge and how does it apply?
What is a wireless bridge, what are its characteristics, and how is it applied? Transmission and service provider Feng Runda is a comprehensive introduction.