36-48 信道也必须启用 DFS 了吗？

开启 DFS 以后，WIFI 启动时间真心长，我记得以前 36-48 不是不用开 DFS 吗？

以下是 Openwrt iw list 的输出：

 * 5180 MHz [36] (20.0 dBm) (radar detection) * 5200 MHz [40] (20.0 dBm) (radar detection) * 5220 MHz [44] (20.0 dBm) (radar detection) * 5240 MHz [48] (20.0 dBm) (radar detection) * 5260 MHz [52] (20.0 dBm) (radar detection) * 5280 MHz [56] (20.0 dBm) (radar detection) * 5300 MHz [60] (20.0 dBm) (radar detection) * 5320 MHz [64] (20.0 dBm) (radar detection) * 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) * 5720 MHz [144] (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) * 5845 MHz [169] (disabled) * 5865 MHz [173] (disabled) 

目前 Openwrt 依赖的无线监管数据库已把 5150 - 5350 整段标记为 DFS 频段了。

+# Source: +# https://wap.miit.gov.cn/cms_files/filemanager/1226211233/attach/20219/d125301b13454551b698ff5afa49ca28.pdf +# Note: The transmit power for 5150-5350MHz bands can be raised by 3dBm when TPC is implemented country CN: DFS-FCC - (2402 - 2482 @ 40), (20) - (5170 - 5250 @ 80), (23), AUTO-BW - (5250 - 5330 @ 80), (23), DFS, AUTO-BW - (5735 - 5835 @ 80), (30) + (2400 - 2483.5 @ 40), (20) + (5150 - 5350 @ 80), (20), DFS, AUTO-BW + (5725 - 5850 @ 80), (33) 

https://wap.miit.gov.cn/zwgk/zcwj/wjfb/tz/art/2021/art_e4ae71252eab42928daf0ea620976e4e.html https://wap.miit.gov.cn/zwgk/zcjd/art/2021/art_f9d24f82c2b24a16b357ae883f21a65e.html https://git.kernel.org/pub/scm/linux/kernel/git/sforshee/wireless-regdb.git/commit/?id=e427ff2a92e26fc1e8336769b9a1ad223f6f697