802.11a/n

David Goodenough david.goodenough at btconnect.com
Tue Aug 16 11:40:40 EDT 2011


On Tuesday 16 Aug 2011, Christian Lamparter wrote:
> On Tuesday, August 16, 2011 04:37:13 PM David Goodenough wrote:
> > On Tuesday 16 Aug 2011, Christian Lamparter wrote:
> > > On Tuesday, August 16, 2011 04:10:31 PM David Goodenough wrote:
> > > > As a side question, why would a card not be allowed to be an AP?  I
> > > > can understand why it might not be capable of being an AP, but
> > > > surely if anyone is allowed to be an AP (and having clients but no
> > > > AP is no use to anyone) why are some cards not allowed to be an AP?
> > > 
> > > Because [at least in the US] the FCC dictates that an AP which
> > > operates in the 5GHz band has to support DFS and TPC.
> > > 
> > > http://www.elliottlabs.com/documents/dynamic_frequency_selection_and_5g
> > > hz_b and.pdf [http://linuxwireless.org/en/developers/DFS]
> > > 
> > > Currently, neither DFS nor TPC are not implementated, therefore you are
> > > not allowed to operate a 5GHz AP, the law is as simple as that.
> > 
> > In which case should the list say that DFS and/or TPC are required.
> 
> Are you questioning your own government :D ? They make the laws, so you
> have to ask them.
Its not my government, I am in the UK and so not subject to the FCC.  However
Ofcom do have similar requirements.

Its not the reason it is disabled I was questioning, it was the way that 
the user was told about it.  
> 
> > I seem to recall that there is work going on to do this
> 
> not anymore.
That is a big shame.  The developers/DFS page you reference above does
not indicate that the effort has stopped.  But the last IRC action plan
is last year, so maybe it just stopped.

David
> 
> Regards,
> 	Chr



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