[Madwifi-users] Issues with disabling 802.11 turbo mode

[Sebastian R. <Seb...@uc...>]

Hi folks,

Since one month I've performed comprehensive measurements for .11a.
Before explaining my problem in detail here are my configurations/equipment:

- Kernel 2.6.26 (Debian 5)
- MadWiFi 0.9.4 Rev 4011
- Routerboard 802.11a/b/g miniPCI card with AR5414 chipset
- TSHARK 1.0.2

After using a spectrum analyser to investigate the adjacent channel
interference problem I got unpredictable peaks over the entire .11a
frequency space. After obtaining the DataRate out of the radio-tap
header of the received package by using Tshark I see _JUST_ Beacons sent
by using a datarate of 12 Mbps. Further, the TSHARK log showed only data
rates above 54 Mbps (mainly 108) for the user data transmission (using
IPERF tool).

I tried to disable the Turbo mode by:

# iwpriv <interface> mode 1
or
# iwpriv <interface> turbo 0
or
# iwpriv <interface> 11a
or
# iwpriv <interface> 11a fixed

Afterwards, I tried the following at any time to look whether something
has changed:

# iwpriv <interface> get_mode

gives _ALWAYS_

# <interface> get_mode:11a


Additionally, I tested infrastructure mode as well as adhoc mode.
However, I still see JUST beacons sent in turbo mode (12Mbps).

# ath_info <HW ADDRESS>
Gives also always:
| 802.11a Support:	yes | Turbo-A disabled: no |


... after playing around with kernel and madwifi versions I give up and
writing now to this mailing list :)

Any suggestions?


Sebastian

-- 
Mr. Sebastian Robitzsch, Dipl.-Ing. (FH)
University College Dublin
School of Computer Science & Informatics
Belfield
Dublin 4
Ireland


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