802.11g Standard On 2.4 GHz

Find out all about the 802.11g standard, its frequency spectrum and allowed power.

This standard was released in June 2003. It works on a frequency of 2.4 GHz, but its maximum bandwidth is 54Mbps. Hardware is compatible with 802.11b hardware.

11g uses OFDM - Orthogonal Frequency-Division Multiplexing for 54, 48, 36, 24, 18, 12, 9, 6 Mbps. In 11 and 5.5 Mbps it uses CCK and DSSS (like 802.11b). This enables compatibility with 802.11b.

So now we have a standard that keeps all good sides of lower 2.4 GHz frequency, like bigger range, lower cost. It has a bandwidth 54 Mbps like 802.11a.

The same as 802.11b, this standard has 14 channels. There are different allowed powers in different regions of the word. The most restricted is Japan and they only allow 30 mW, in Europe the threshold is 50 mW, while in the Americas this value is 100 mW. The value of central frequency is the same as for 11b.

You can see that frequency, channels, band gap of 11b and 11g is the same, what is different is the type of modulation used for these two different standards. All this is the reason why these two standards are compatible.

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