[OpenWrt-Devel] Support for DFS 5470 - 5725MHz DFS channels in US?

[Ben West]

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
ben at gowasabi.net
314-246-9434
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