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Date: Fri, 22 Feb 2008 09:33:26 +0800
From: "Sepherosa Ziehau" <sepherosa@gmail.com>
To: "Barbieri, Paul (US SSA)" <paul.barbieri@baesystems.com>
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References: <8DD841934E0E96429CC4470C23528CA10260B9CB@GLDMS00013.goldlnk.rootlnka.net>
Cc: freebsd-net@freebsd.org
Subject: Re: ieee80211 ms and tu convert macros
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On Thu, Feb 21, 2008 at 1:30 AM, Barbieri, Paul  (US SSA)
<paul.barbieri@baesystems.com> wrote:
> I happened to be looking in net80211/ieee80211_var.h and examined the
>  macros IEEE80211_MS_TO_TU and IEEE80211_TU_TO_MS. The conversions seem
>  backward to me. The macros are:
>
>
>
>  #define IEEE80211_MS_TO_TU(x)          (((x) * 1000) / 1024)
>
>  #define IEEE80211_TU_TO_MS(x)          (((x) * 1024) / 1000)
>
>
>
>  If I take the values:
>
>             1 second = 1000 milliseconds (ms) = 1024 timer units (tu)

Please reread 802.11-1999, page 6, 3.45:
one tu is 1024us

Best Regards,
sephe

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