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xumec_3997051
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First reply posted First question asked Welcome!

I'm using a wifi module AP6330, the chipset is BCM4330. I want create a 80211an AP with SHORT-GI (72.2Mbps).

My system is run on Linux 4.9 mainline bcmdhd, BCM4330 firmware version is fw_bcm40183b2_ag_apsta.bin

FW Version string:
4330b2-roml/sdio-ag-pool-wme-apsta-idauth Version: 5.90.195.89 CRC: 4b89dc94 Date: Mon 2013-07-22 15:40:35 CST FWID 01-b77f69d6

hostapd-2.9 with this configuration:

-----------------------------------------------

interface=wlan0
ctrl_interface=/tmp/hostapd
ctrl_interface_group=0

ssid=wifitest
auth_algs=1
wpa=2
wpa_key_mgmt=WPA-PSK
rsn_pairwise=TKIP CCMP
wpa_passphrase=11223344

hw_mode=a
channel=36
ieee80211n=1
ht_capab=[SHORT-GI-20]

max_num_sta=10
beacon_int=100
dtim_period=1

-----------------------------------------------

 

then I check the AP on my laptap, the max connection speed is 65Mbps

and I grap the beacon packet, the bit (SHORT-GI-20) is not set int the HTcap field

Does this chipset(BCM4330) support SHORT-GI-20 ?

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1 Solution

Hi @xumec_3997051 ,

Since this is an old chip, it has reached its end of life. Unfortunately, We do not have this module to reproduce the issue, so It cannot be supported in the community. 

Thanks

 

View solution in original post

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3 Replies
raks_99
Moderator
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Moderator
250 replies posted 250 sign-ins 100 replies posted

Hi @xumec_3997051 ,

As a quick test, I tried your hostapd config on a different dual-band chip and I am able to see the Short GI for 20Mhz is marked as supported in the beacon packet.

Have you tried to change the country code to see if it has any effect? I used 'country_code=GB' in my test

Let me try to check this on a 4330 setup. I will get back.

Thanks

 

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I tested country code change nothing

on the same board, I can get my AP6212 working as 80211n 2.4G 72.2Mbps AP with SHORT-GI, so I think the board/kernel/bcmdhd/hostapd is good

But failed to get AP6330 working  on SHORT-GI, both 2.4G and 5G only get 65Mbps, beacon with no short-GI set. seems that AP6330 doesn't support SHORT-GI.

 

have any update ?

 

 

 

😞

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Hi @xumec_3997051 ,

Since this is an old chip, it has reached its end of life. Unfortunately, We do not have this module to reproduce the issue, so It cannot be supported in the community. 

Thanks

 

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