Recieve data with Netgear WG602v2 below 80kBytes/s

Dear All,

Just spent some time setting up a Belkin F5D6050 version 2 with the 
at76c503 driver.

First thanks to all those who have put so much hard work into developing 
and maitaining this driver.

On with a bit of technical background.
The F5D6050 I purchases has ver.1000 on the back however it identifies 
itself with the USB vendor/product 0x50d/0x50.

This is important if you have SuSE9.0.  This has a package for at7c503a 
verion 0.10. You need to download 0.11 to cope with this device.

Ok back to the problem.
Once everying was working on the linux end I found the recieve data rate 
was very poor. The problem occurs when connecting to my Netgear WG602v2 
access point. Since I only have this one AP I'm not sure which side was 
responsible for the bad performace. The latest firmware upgrade 
"wg602v2_3_1rc5.img" makes no difference however.


After much work trying to get the Windows drivers sorted out I was able 
to reproduce this behaviour in Windows.

Under windows I could repoduce the problem with the Belkin v2.15 driver 
as shipped on the CD-rom
Downgrading to the v2.14 driver fixes the problem!!
I assume the issue is with the latest firmware. The working old firmware 
is version 0.100.5.78

With this knowledge I was able to try out all the options in the linux 
v0.11 driver. I was lucky and found that the compatiblity problem is 
with the long/short preambles.

For Linux the workaround is to set
EITHER in "modules.conf"
	options at76c503 preamble_type=1

OR on with the command
	iwpriv wlan0 short_preamble 1

I hope this information is understandable and of some use!

Michael

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Michael Stevens Systems Engineering
Lilienweg 13a
34128 Kassel, Germany

Phone/Fax: +49 561 5218038
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