Appendix C: Channels Explained
The ins and outs of the 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 simply want to know more about the technical minutiae of Wi-Fi. In this appendix, you can learn 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 offer quadruple-wide 80 MHz channels (wave 1) and octuple-wide 160 MHz channels (wave 2). The two bands have different ways of defining and making those ...
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