I found on a UBNT Nanostation running BB r43824 that apparently only a subset of the DFS 5.8GHz channels are enabled.
Frequencies: * 5180 MHz [36] (17.0 dBm) * 5200 MHz [40] (17.0 dBm) * 5220 MHz [44] (17.0 dBm) * 5240 MHz [48] (17.0 dBm) * 5260 MHz [52] (23.0 dBm) (no IR, radar detection) DFS state: usable (for 730 sec) * 5280 MHz [56] (23.0 dBm) (no IR, radar detection) DFS state: usable (for 730 sec) * 5300 MHz [60] (23.0 dBm) (no IR, radar detection) DFS state: usable (for 730 sec) * 5320 MHz [64] (23.0 dBm) (no IR, radar detection) DFS state: usable (for 730 sec) * 5500 MHz [100] (disabled) * 5520 MHz [104] (disabled) * 5540 MHz [108] (disabled) * 5560 MHz [112] (disabled) * 5580 MHz [116] (disabled) * 5600 MHz [120] (disabled) * 5620 MHz [124] (disabled) * 5640 MHz [128] (disabled) * 5660 MHz [132] (disabled) * 5680 MHz [136] (disabled) * 5700 MHz [140] (disabled) * 5745 MHz [149] (30.0 dBm) * 5765 MHz [153] (30.0 dBm) * 5785 MHz [157] (30.0 dBm) * 5805 MHz [161] (30.0 dBm) * 5825 MHz [165] (30.0 dBm) This matches the channel definitions in the reg DB file: https://dev.openwrt.org/browser/trunk/package/kernel/mac80211/files/regdb.txt What is the reason for keeping channels 5470 - 5725 disabled, when that range is enabled, for example, for country DE? People are operating UBNT products with stock firmware on these bands in the US. This table below represents my current understanding of permissible use of the DFS channels in the US: *Point-to-MultiPoint* *Band* *Lower Frequency* *Upper Frequency* *FCC Reg* *Max Power (dBm)* *Notes* 900 MHz 902.0MHz 928.0MHz Part 15.247 (b)(3) , (b)(4) 36dBm 2.4 GHz 2400.0MHz 2483.5MHz Part 15.247 (b)(3) , (b)(4) 36dBm 5.1 GHz UNII Low 5150.0MHz 5250.0MHz Part 15.407 (a)(1), (e) 36dBm 5.3 GHz UNII Mid 5250.0MHz 5350.0MHz Part 15.407 (a)(2), (h)(2) 30dBm Requires DFS & radar det. 5.4 GHz UNII DFS 5470.0MHz 5725.0MHz Part 15.407 (a)(2), (h)(2) 30dBm Requires DFS & radar det. 5.8 GHz UNII Upper 5725.0MHz 5875.5MHz Part 15.247 (b)(3) , (b)(4) 36dBm Part 15.407 (a)(3) -- Ben West http://gowasabi.net b...@gowasabi.net 314-246-9434
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