The difference between 2.4G and 5.8G wireless bridges
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The wireless products we use in our lives. Saying that we have everybody's life completely inseparable from the wireless products. For example, our mobile phone is wireless, and now the mobile phone is basically a human hand, making calls, and surfing the Internet. , It is getting more and more inseparable from everyone's life, and even Xiao Bian feels that leaving the mobile phone seems to have been abandoned by the world. You say how important wireless phones are now! Such as: remote control, fixed telephone, and we often see that monitoring also uses wireless products, etc. These products are all wireless, and our wireless monitoring has brought direct convenience to our users. , Do not you do not know, one can not be separated, Oh, you said that your life can be away from the wireless products? No matter how close you can not leave, anyway, Xiao Bian is inseparable, because of the wireless brings convenience Just like a heavy drug, it has made Xiaobian unable to stop.
We talked about so much as we quickly entered the topic, wireless has a good number of bands, the most commonly used on the market today is the 2.4G and 5.8G bands, as well as 1.2G, with the advancement of technology, 1.2G band more The less people use, so we mainly talk about 2.4G frequency band and 5.8G frequency band today. Their common point is that they are all civil frequency bands. There is no need to file an application with the Wireless Management Committee. Our country’s frequency bands are full, but we can There is not much for everyone to use for free, so when using this piece, you need to pay attention. If your wireless product is a nationally-banned band, someone will soon find you a little trouble, so our 2.4G and 5.8G The civilian frequency band still saves you from worrying about the 2.4G and 5.8G frequency bands. There are many different places. The transmission protocols used during the work are different. In the 2.4G frequency band, most of the transmission protocols are 802.11B and 802.11G, or 802.11GN, can reach 11Mbps on broadband. We say that the 5.8G transmission protocol is divided into 802.11a and 802.11an. The transmission rate is 54Mbps, which is a difference between them.
Compared with 2.4G and 5.8G transmission signals, it is not easily interfered with by other signals, but 5.8G does not have 2.4G diffraction and penetrating ability, and it is easily absorbed by obstructions, but 5.8 G uses Orthogonal Frequency Division Multiplexing (OFDM) to do a very good job of handling received and transmitted signals to ensure the most accurate transmission of signals.
However, the use of 2.4G band will be much stronger than the 5.8 band penetration capability. For example, in the case of close range, we use the WIFI access point, can still normally connect signals under normal conditions, but 2.4G But it is easy to interfere with external signals, because many places will use 2.4G signals, for example, mobile phones, microwave ovens, Bluetooth, etc. are used 2G or 3G signals, so it is very easy to interfere with the same band signal, and 5.8 G's current frequency is a very clean frequency band, and it has not been developed and used too much. At present, wireless bridges are only used in wireless monitoring systems, so the anti-interference ability is stronger than that of 2.4G. There are also wireless monitoring systems. The 5.8G band wireless monitoring equipment is much farther than the 2.4G band equipment. If you encounter bad weather such as snowstorms, rain, sandstorms and other weather, the signal attenuation is small and the stability is excellent.
Wireless can not be used in any environment. For example, in a wireless monitoring system, video signals can be transmitted under the condition of free access. The principle of its use is similar to the linear transmission of light. We have also mentioned wireless above. The microwave does not penetrate or diffract, so if it encounters obstacles, it will be absorbed. However, if it is under close range conditions, the wireless bridge itself has a certain transmit power, so it can still be at close range. Transmission of the signal, but it is not recommended for long-term use.
The question that everyone is most concerned about is whether wireless has harmed the human body. Xiaobian's answer is of course certain, but why is it allowed to allow production to be used in circulation in the market for everyone to use? Don't rush to allow Xiaobian to sell. In fact, all of the wireless electronic products in the market have a certain degree of harm to the human body when they are used. However, manufacturers only use the country's wireless use regulations when producing products, and do not exceed its usage standards, but also radiation to the human body. Very small, so everyone can still use it with confidence.
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