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 ...

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 _at_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