802.11a/n

David Goodenough david.goodenough at btconnect.com
Tue Aug 16 10:37:13 EDT 2011


On Tuesday 16 Aug 2011, Christian Lamparter wrote:
> On Tuesday, August 16, 2011 04:10:31 PM David Goodenough wrote:
> > On Tuesday 16 Aug 2011, Jouni Malinen wrote:
> > > On Mon, Aug 15, 2011 at 10:03:00PM -0700, Grant wrote:
> > > > Thank you.  I get the following, it looks like the 5Ghz channels
> > > > should work?
> > > 
> > > In station mode, but not in AP mode:
> > > > 			* 5180 MHz [36] (19.0 dBm) (passive scanning, no IBSS)
> > > > 			* 5200 MHz [40] (19.0 dBm) (passive scanning, no IBSS)
> > > > 			* 5220 MHz [44] (19.0 dBm) (passive scanning, no IBSS)
> > > > 			* 5240 MHz [48] (19.0 dBm) (passive scanning, no IBSS)
> > > 
> > > Those are fine in modes that passively search an AP and connect to it.
> > > However, they are not available for starting an AP (or IBSS).
> > > 
> > > > 			* 5260 MHz [52] (disabled)
> > > 
> > > And those are disabled completely.
> > 
> > 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_5ghz_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, and then
we would know that when DFS/TPC are implemented (and I seem to recall that
there is work going on to do this) this card will work?

David


More information about the HostAP mailing list