D-Link DWL-650H

[Johnny Shih]

-----Original Message-----
From: Pavel Roskin [mailto:proski at gnu.org] 
Sent: Thursday, August 01, 2002 11:24 PM
To: Johnny Shih
Cc: wireless at lists.samba.org
Subject: Re: D-Link DWL-650H

Hi, Johnny!

> > I tried "testing" driver and it works after many times of restarting

> > the card using cardctl......it looked like it receives erroneous 
> > packets occasionally.

D-Link DWL-650H sometimes loses interrupts informing the driver that the
buffer has been allocated.  In 4 in 5 cases it loses the interrupt for
the
third packet being sent.  In the remaining 1 in 5 cases it works fine.  
The orinoco driver is very sensitive to this problem - it won't send
more
data until the interrupt arrives.

If the transmission queue stalls, the network level initiates a reset.  
This reset is a bit heavy-handed in the testing version.  You can try
the
driver from this distribution, it doesn't prevent resets, but the card
recovers from missing interrupts:

http://www.red-bean.com/~proski/symbol/spectrum24-0.3.5.tar.gz

> > Jan, thanks for the file. Just one little thing, I am too stupid to 
> > figure out how to actually install the patch, would you mind 
> > instructing me?

Run "man patch".  No need to ask it in this list.

> Ok David, I think I made a mistake. It looks like to incompatibility
of 
> WEP between your orinoco driver and wlan-ng's driver. After turning if

> off, it works fine...was using 128bit encryption, 26 hexdecimal
digits.

WEP must be compatible.  However, using WEP can trigger bugs in the 
firmware and contribute to timeouts.
-- 
Regards,
Pavel Roskin
------------------------------------------------------------------------
----

Thanks Pavel, your words have been greatly helpful.

However, regarding to your last point, I believe firmware is hardware
related and should not affect how cards are running under different OS
with different drivers. If so, I do not understand why the cards are
communicating perfectly under Windows XP with the same 128bit WEP
enabled...

Best regards
Johnny Shih