by the BBC
There are two WiFi frequencies that are used. That’s 2.4Ghz, a lot of people know it as 11bg, and there’s something called 5Ghz. [The challenge is] convincing the world to use 5Ghz and the 24 channels offered in this band, versus the 3 usable channels in the 2.4Ghz band. Unfortunately, the continued proliferation of legacy 802.11bg client technology continues, with the entire world sharing just three channels. This leads to performance problems because of all the client devices are packed on those three channels.
http://www.bbc.co.uk/news/business-16532774
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