> On 27 Jan 2016, at 14:17, Matthew Newton <[log in to unmask]> wrote:
>
> Hi,
>
> On Wed, Jan 27, 2016 at 01:37:19PM +0000, Scott Armitage wrote:
>> Plus pretty much everything above channel 52 in Europe is indoor
>> use only. So any outdoor APs must not use these channels.
>
> Not according to Ofcom:
>
> http://stakeholders.ofcom.org.uk/binaries/spectrum/spectrum-policy-area/spectrum-management/research-guidelines-tech-info/interface-requirements/uk2006.pdf
>
> Band A (channels 36-64) is indoor only, max 200mW with DFS.
>
> Band B (channels 100-140) is any use (just "licence exempt")
> maximum 1W with DFS.
>
Good point.
> and our Cisco controllers refuse to permit the external APs to use
> any 5Ghz channels less than 100, in line with this. I guess we
> just see DFS trigger more on the external APs, which figures.
It is useful that the CRDA is kept up to date so (in theory) the wifi kit should know which channels it can and can’t use :-)
>
>> Notice to 10 minute CAC channels in Europe i.e. you must listen
>> for 10 minutes on the channel before you can use it. This makes
>> the channel pretty much unusable (unless you don’t mind 10
>> minute outages for your APs).
>
> IIRC the Cisco APs shut down the radios for 30 minutes when DFS
> triggers and they can't jump to a different channel.
>
It may be worth doing some googling on this. I thought it would avoid to the channel (which RADAR was detected on) for 30 minutes.
I thought it will instantly select a new channel (after sending it’s 11h announcements) then if it is a DFS channel will listen for 60 seconds.
:-S
> I think they listen for 2 minutes before starting to transmit on a
> new channel, but I may be wrong on this - I didn't think it was
> any longer than that, though, maybe 30 seconds.
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