What's the status of 802.11AC support?

Pontus Karlsson pontusjoncarlsson
Tue Aug 5 01:56:59 PDT 2014

Hi Arend, and thanks a bunch for the configuration!

As far as I understand it, the higher speeds of 11ac is dependent on both modes operating simultaneously
and in cooperation. Is this correct?

You?re saying that all my STAs needs to be 11ac compatible, but ?one of the main reasons I?m switching to 11ac is due to
the vary of different clients that connects to our network, there?s even a few 802.11g clients (cellphones mainly).
According to different sources and specifications 11ac is supposed to be compatible with both a/b/g/n/ac,?
I suppose this is due to it?s operation on both modes as well?

I?m curious, what speeds do you measure with that setup, and with what chipset / NIC?

On 5 Aug 2014 at 10:10:10, Arend van Spriel (arend at broadcom.com) wrote:

On 08/05/14 06:53, Pontus Karlsson wrote:  
> I?m considering upgrading my WiFi NIC in my router and need to know,  
> if I were to get an ASUS PCE-AC68  
> (http://www.asus.com/us/Networking/PCEAC68/)  
> What could I expect from this running hostapd in terms of speed and  
> reliability?  
> Bare in mind I?m very fresh when it comes to hostapd, I usually end up  
> with a simple configuration  
> that partially works for my needs and stick with that for a few years.  
> As far as I understand it, 802.11AC in order to achieve higher speeds it  
> needs to operate in both  
> 2.4Ghz mode and 5Ghz mode simultaneously. Does this work properly in  
> hostapd?  

Hi Pontus,  

The higher speeds in 11ac are depending on bandwidth doing 80MHz and  
higher and some more stuff that falls under the term MCS. Anyway, 11ac  
is only available in 5GHz. Probably stating the obvious but both AP and  
STA clients must be 11ac capable. Attached is a sample config I used. It  
is a bit tricky. The channel indicates the operating channel. I used  
channel 36 and for 11ac you have to specify the center frequency using  
vht_oper_centr_freq_seg0_idx, which is 42 in my case for 80MHz bandwidth  
(vht_oper_chwidth=1). If I am not mistaken vht_oper_centr_freq_seg1_idx  
is only used for 80+80 bandwidth.  

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