In wireless transmission, we often use the bridge, and then for the long-distance or obstacle environment, but have to use the relay method. Yesterday, friends in the weak VIP group also mentioned similar problems, here Xiaobian and everyone to understand The application of wireless relay.
When a wireless bridge is used in wireless monitoring, there are three networking modes and transmission modes, namely point-to-point transmission, point-to-multipoint transmission, and relay transmission. However, in practical applications, the relay mode is still relatively rare. One is to increase the cost, and the other is that the signal has a certain loss.
But sometimes there are relays that have to be used. For example, the on-site environment is not ideal. There are always transmission lines that block the wireless bridges here or there, such as buildings, buildings, trees, etc. If you don’t want to change the lines at this time, Only relay transmissions can be taken.
In the relay mode, the wireless signal is transmitted from one relay point to the next relay point by using the connection function between the wireless bridges to realize signal enhancement and form a new wireless coverage area, and finally reach the extended wireless network. The purpose of coverage.
Here is the difference between relay and bridge. Point-to-point transmission or point-to-multipoint transmission of a wireless bridge belongs to the bridging category, and relay transmission belongs to the relay category. There will be two separate SSIDs in the bridge, even if the SSID is set to the same, it will show multiple, and the relay has only one SSID, no matter how many bridges.
The purpose of bridging is to connect two or more different networks in order to extend the coverage of the wireless network. The purpose of the relay is to expand the coverage of the same wireless network. In general, the nature of bridging and relaying is different, but the purpose is the same.
There are three different ways of relaying, namely single mode single wireless bridge relay, single mode dual wireless bridge relay, dual mode / multimode single wireless bridge relay.
Single mode single wireless bridge relay
Single-mode single-wire wireless bridge relay uses a single-mode wireless bridge as a relay point, and then is connected to two antennas through a power splitter, one antenna is connected to the wireless bridge of the monitoring point, and the other antenna is connected. The wireless bridge of the monitoring center. Although this is the most cost-effective mode, the use of power splitters will reduce the bandwidth by more than half. Therefore, in some large-scale projects or projects with high bandwidth requirements, this type of relay is generally not used.
2. Single mode dual wireless bridge relay
Single-mode dual wireless bridge relay, using two single-mode wireless bridges as relay points, using switches to connect the two wireless bridges, one of which is aligned with the wireless bridge of the monitoring point, used as a receiving signal, and One is aligned with the wireless bridge of the monitoring center and used as a transmitting signal. This method has a small loss, and most applications are used in projects that extend the transmission distance, avoid obstructions, and have high transmission bandwidth requirements. The disadvantage is that more devices are used and the cost is higher.
3. Dual mode / multimode single wireless bridge relay
The dual-mode/multi-mode single-wireless bridge relay uses a dual-mode or multi-mode wireless bridge as a relay point, and the wireless bridges of the monitoring points in each direction are used as receiving ends by two or more antennas. The antenna that is aligned with the wireless bridge of the monitoring center acts as the transmitting end. With the advantages of dual-mode or multi-mode, you can save the cost of multiple wireless bridges, and you don't need a splitter or switch to make installation easier. This kind of relay mode is mostly used in monitoring engineering or component MESH networks with long transmission distance, high transmission bandwidth requirements, avoiding obstructions, multiple relay points, etc. The disadvantage is that the price of such devices is relatively high. But the relative performance is stronger.
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