Learn more about IEEE 802.11a in the WiFi protocol, which is the first 5G band protocol.
1) Protocol interpretation: IEEE 802.11a is a revised standard of 802.11 and its original standard, which was approved in 1999. The core protocol of the 802.11a standard is the same as the original standard, but its working frequency is 5GHz, 52 orthogonal frequency division multiplexing subcarriers are used, and the maximum original data transmission rate is 54Mb/s, which makes it meet the requirement of medium throughput (20MB/s) of the real network. Of course, if necessary, the data rate can be reduced to 48MB/s, 36MB/s, 24MB/s, 18MB/s, 12MB/s, 9MB/s, or 6MB/s. 802.11a has 12 channels that do not overlap each other, of which 8 are used indoors and the other 4 are used for point-to-point transmission. It cannot interoperate with 802.11b unless a device that adopts both standards is used.
2) IEEE 802.11a Advantages and disadvantages: since the 2.4G band was used intensively at that time, it became increasingly crowded. Therefore, using the 5g band is an important improvement of 802.11a, which has fewer conflicts. However, the high carrier frequency also has negative effects. The transmission distance is less than 802.11b/g; theoretically, 5g signals are more easily blocked and absorbed by walls, which is suitable for straight-line and unobstructed propagation, which leads to the need to use more access points. Therefore, the coverage of 802.11a is less than that of 801.11b. 802.11a will also cause problems because its wavelength will be absorbed by nearby materials, making its signal weaker and more noticeable over time. However, since there are not many interference signals nearby, the throughput of 802.11a is generally good.
The above are the knowledge points of the IEEE802.11a protocol and its advantages and disadvantages.
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