* wireless-regdb: Why crda db.txt disallows 40Mhz BW on Channel 12-13 for JP?
@ 2010-08-02 11:55 yogeshp
2010-08-03 0:02 ` Luis R. Rodriguez
0 siblings, 1 reply; 2+ messages in thread
From: yogeshp @ 2010-08-02 11:55 UTC (permalink / raw)
To: linville@tuxdriver.com; +Cc: linux-wireless@vger.kernel.org
Hello All,
Crda db.txt has following entries for JP:
(2402 - 2472 @ 40), (N/A, 20)
(2457 - 2482 @ 20), (N/A, 20)
Why are channel 12 and 13 for JP disallowed to operate in 40Mhz by this file?
As per Annex 11J of latest 802.11n spec, for Japan, channel 1-7 are allowed in HT40+ and channel 5-13 are allowed in HT40- mode.
Thanks,
Yogesh
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: wireless-regdb: Why crda db.txt disallows 40Mhz BW on Channel 12-13 for JP?
2010-08-02 11:55 wireless-regdb: Why crda db.txt disallows 40Mhz BW on Channel 12-13 for JP? yogeshp
@ 2010-08-03 0:02 ` Luis R. Rodriguez
0 siblings, 0 replies; 2+ messages in thread
From: Luis R. Rodriguez @ 2010-08-03 0:02 UTC (permalink / raw)
To: yogeshp, Michael Green
Cc: linville@tuxdriver.com, linux-wireless@vger.kernel.org
On Mon, Aug 2, 2010 at 4:55 AM, yogeshp <yogeshp@marvell.com> wrote:
> Hello All,
>
> Crda db.txt has following entries for JP:
> (2402 - 2472 @ 40), (N/A, 20)
> (2457 - 2482 @ 20), (N/A, 20)
>
> Why are channel 12 and 13 for JP disallowed to operate in 40Mhz by this file?
>
> As per Annex 11J of latest 802.11n spec, for Japan, channel 1-7 are allowed in HT40+ and
> channel 5-13 are allowed in HT40- mode.
Do you mean Section 11J.1? That stuff defines a regulatory class, its
not a regulatory text though. Linux dynamically computes the HT40+ or
HT40- allowed channel map based on frequency ranges supported and the
max allowed bandwidth for its frequency ranges.
Michael, can you confirm if HT0 is allowed on the 2.4 GHz band in JP ?
Luis
^ permalink raw reply [flat|nested] 2+ messages in thread
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2010-08-02 11:55 wireless-regdb: Why crda db.txt disallows 40Mhz BW on Channel 12-13 for JP? yogeshp
2010-08-03 0:02 ` Luis R. Rodriguez
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