About 5GHz channel allocations…
“Wireless on 5GHz isn’t new, so you may be wondering why DFS is suddenly becoming an issue. The new challenge stems from one of the mechanisms that enables 802.11ac’s faster speeds: its broader channel widths. Earlier Wi-Fi standards used 20 MHz- and 40 MHz-wide channels. 802.11ac allows 40 MHz-wide channels, and its real speed emerges when using 80 MHz-wide channels. The 11ac specification also outlines 160 MHz-wide channels, but at this point it’s a theoretical implementation and not on the roadmap for most vendors.”
“802.11ac operates exclusively in the 5GHz spectrum. While 11n had the full spectrum of 2.4GHz and 5GHz channels at its disposal, 11ac is limited to 5GHz, and only 36% of the 5GHz channels are free and clear of DFS and radar.”
5GHz Channel Allocations
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