Both IEEE802.11b and IEEE802.11g operate in the 2.4GHz frequency band. Let’s take a look at these two protocols in succession to help you gain a deeper understanding of the standards of different protocols.
IEEE 802.11b is a standard in wireless local area networks. Its carrier frequency is 2.4GHz, and it can provide multiple transmission speeds of 1, 2, 5.5 and 11Mbit/s, with the maximum reaching 11Mbit/s. Its release time is five times faster than the IEEE 802.11 standard approved just two years ago, which has provided a basic support for higher transmission rates in expanding the application fields of wireless local area networks. In use, different bandwidths among 5.5Mbps, 2Mbps and 1Mbps can be adopted according to the actual situation. After actual testing, the actual working speed is about 5Mb/s, which is almost at the same level as the ordinary 10Base-T specification wired local area network. There are a total of 11 channels with a bandwidth of 22MHz available in the 2.4GHz ISM band, which are 11 overlapping bands. The successor standard of IEEE 802.11b is IEEE 802.11g.
IEEE 802.11g was approved in July 2003. Its carrier frequency is 2.4GHz (the same as 802.11b), and it has a total of 14 frequency bands. The original transmission speed is 54Mbit/s, and the net transmission speed is approximately 24.7Mbit/s (the same as 802.11a). 802.11g devices are backward compatible with 802.11b.
Subsequently, some wireless Router manufacturers developed new standards based on the IEEE 802.11g standard in response to market demands, and increased the theoretical transmission speed to 108Mbit/s or 125Mbit/s. Currently, protocols involving WiFi6 and above include IEEE 802.AX and others, all of which make more optimizations at the PHY layer. Increasing the rate to above gigabit will not be elaborated on here for the time being.
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