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Take Control of Your Apple Wi-Fi Network by Glenn Fleishman

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Appendix C: Channels Explained

The ins and outs of channels used in each band have wound up in this appendix, as you may need to know the details only when something goes wrong—or you may be among the more technically inclined readers who want to know more about the technical minutiae of Wi-Fi. In this appendix, you can learn about why the 2.4 and 5 GHz channels are organized the way they are, and what happened to 15 missing 5 GHz channels.

Channels in 2.4 and 5 GHz are 20 MHz wide; an optional 40 MHz wide, or double-channel, option was added in 802.11n, although Apple allows 40 MHz wide channels only in 5 GHz. 802.11ac expanded this to 80 MHz and 160 MHz wide channels; Apple included the mandatory 80 MHz width, but not the optional 160 MHz ...

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