Date: Fri, 12 Dec 2008 09:15:31 -0800 From: Sam Leffler <sam@freebsd.org> To: Andrew Atrens <andrew@atrens.ca> Cc: freebsd-current@freebsd.org Subject: Re: HEADS UP: r185522 - in head: . share/man/man4 sys/amd64/conf sys/arm/conf sys/conf sys/contrib/dev/ath sys/dev/ath sys/dev/ath/ath_rate/amrr sys/dev/ath/ath_rate/onoe sys/dev/ath/ath_rate/sample ... Message-ID: <49429C33.9030300@freebsd.org> In-Reply-To: <4942879F.1040601@atrens.ca> References: <493418EA.7020602@freebsd.org> <4942879F.1040601@atrens.ca>
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Andrew Atrens wrote:
> Hi Sam,
>
> I'm noticing that regdomain support for 'FCCB' appears to be included
> but is not hooked in to a countrycode yet. I've made the (very simple)
> changes myself and the kernel appears to be sane though I haven't yet
> attempted a connection at 10 or 5 Mhz, 20Mhz definitely still works ..
>
> $ ifconfig -v ath0 list channels
> Channel 1 : 2412 Mhz 11b Channel 6 : 2437 Mhz 11g/10Mhz
> Channel 1 : 2412 Mhz 11g Channel 6 : 2437 Mhz 11g/5Mhz
> Channel 1 : 2412 Mhz 11g/10Mhz Channel 7 : 2442 Mhz 11b
> Channel 1 : 2412 Mhz 11g/5Mhz Channel 7 : 2442 Mhz 11g
> Channel 2 : 2417 Mhz 11b Channel 7 : 2442 Mhz 11g/10Mhz
> Channel 2 : 2417 Mhz 11g Channel 7 : 2442 Mhz 11g/5Mhz
> Channel 2 : 2417 Mhz 11g/10Mhz Channel 8 : 2447 Mhz 11b
> Channel 2 : 2417 Mhz 11g/5Mhz Channel 8 : 2447 Mhz 11g
> Channel 3 : 2422 Mhz 11b Channel 8 : 2447 Mhz 11g/10Mhz
> Channel 3 : 2422 Mhz 11g Channel 8 : 2447 Mhz 11g/5Mhz
> Channel 3 : 2422 Mhz 11g/10Mhz Channel 9 : 2452 Mhz 11b
> Channel 3 : 2422 Mhz 11g/5Mhz Channel 9 : 2452 Mhz 11g
> Channel 4 : 2427 Mhz 11b Channel 9 : 2452 Mhz 11g/10Mhz
> Channel 4 : 2427 Mhz 11g Channel 9 : 2452 Mhz 11g/5Mhz
> Channel 4 : 2427 Mhz 11g/10Mhz Channel 10 : 2457 Mhz 11b
> Channel 4 : 2427 Mhz 11g/5Mhz Channel 10 : 2457 Mhz 11g
> Channel 5 : 2432 Mhz 11b Channel 10 : 2457 Mhz 11g/10Mhz
> Channel 5 : 2432 Mhz 11g Channel 10 : 2457 Mhz 11g/5Mhz
> Channel 5 : 2432 Mhz 11g/10Mhz Channel 11 : 2462 Mhz 11b
> Channel 5 : 2432 Mhz 11g/5Mhz Channel 11 : 2462 Mhz 11g
> Channel 6 : 2437 Mhz 11b Channel 11 : 2462 Mhz 11g/10Mhz
> Channel 6 : 2437 Mhz 11g Channel 11 : 2462 Mhz 11g/5Mhz
> Channel 6 : 2437 Mhz 11g Turbo
>
> Since it appears that everything is in place to support it, I'm
> curious whether there is some technical or regulatory/legal reason
> that this hasn't yet been done ..
>
> I'm not sure of all of the tradeoffs of 5Mhz/10Mhz channels @2GHz, I
> know that one downside is that likely only ofdm modulations will work,
> an obvious one is that you'd lose half the bandwidth.
>
> On the positive side I suspect (as is the case for 900Mhz) one's noise
> immunity may change (improve?), and perhaps my signal may get a bit
> more 'punch' as on the access side I'm firing through a fair bit of
> foliage.
>
FCCB was added solely for testing 1/2 and 1/4 width channel support in
2.4G; hence the lack of a public hookup. I can't advise you on
regulatory issues. Given the shortage of spectrum in the 2.4 band I can
imagine folks doing outdoor applications might find this useful.
Sam
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