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From: Simon Wunderlich <sw@simonwunderlich.de>
To: Janusz Dziedzic <janusz.dziedzic@tieto.com>
Cc: linux-wireless@vger.kernel.org, johannes@sipsolutions.net
Subject: Re: [PATCH v3 4/4] cfg80211: DFS use 10 minutes CAC when weather channels
Date: Tue, 26 Nov 2013 15:50:14 +0100	[thread overview]
Message-ID: <201311261550.14953.sw@simonwunderlich.de> (raw)
In-Reply-To: <1385409372-4229-4-git-send-email-janusz.dziedzic@tieto.com>


> When nominal bandwidth falls completely or partly
> within the band 5600MHz to 5650MHz the CAC time shall
> be 10 minutes.
> This is ETSI requirement. FCC forbids weather channels usage.

Although it is correct to handle that with longer times and all, I don't think 
we should enable weather channels at all, not even for ETSI. Unlike "normal" 
channels, it requires 99.99% detection rate in CAC, which is (I think) 
practically impossible.

I guess we need ath9k (or other drivers, maybe ath10k too) to disallow CAC on 
these channels, if we know that the drivers can do it? Although I don't think 
it's technically possible ...

Cheers,
    Simon

  reply	other threads:[~2013-11-26 14:50 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-11-25 19:56 [PATCH v3 1/4] cfg80211: add reg_get_dfs_region() Janusz Dziedzic
2013-11-25 19:56 ` [PATCH v3 2/4] cfg80211: DFS check dfs_region before usage Janusz Dziedzic
2013-11-25 19:56 ` [PATCH v3 3/4] cfg80211/mac80211: DFS pass CAC time as a parameter Janusz Dziedzic
2013-11-25 19:56 ` [PATCH v3 4/4] cfg80211: DFS use 10 minutes CAC when weather channels Janusz Dziedzic
2013-11-26 14:50   ` Simon Wunderlich [this message]
2013-11-26 20:19     ` Janusz Dziedzic
2013-11-26 20:39       ` Johannes Berg
2013-11-27  6:16         ` Janusz Dziedzic
2013-12-02 14:43           ` Johannes Berg
2013-12-03 12:54 ` [PATCH v3 1/4] cfg80211: add reg_get_dfs_region() Johannes Berg

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