Re: [Madwifi-users] 3CRPAG175 - severe performance problems

[Michael K. <mad...@en...>]

Hi,

I've got two cards:
- 3com PCMCIA 3CRPAG175 802.11a/b/g (the same than yours)
- 3com PCI 3CRDAG675 802.11a/b/b
both with the same Atheros 5212 Chip. To make the driver load for the PCI card 
I had to add 0x10b7, 0x0013 to if_ath_pci.c (the other entry was already 
there as I downloaded the driver from cvs). The driver is not able to detect 
that this is also a 5212 Chip:

Dec 23 03:26:06 router kernel: ath0: Atheros ???: mem=0xcefc0000, irq=5

I use on both computers Gentoo Linux 1.4. On the Computer with the PCI card I 
use linux-2.4.21-ac1 and on the other one linux-2.6.0. The PCI Card is in 
master mode, the PCMCIA card is in managed mode. The connection is works 
sometimes, but not always. Putting both antennas close to each other the link 
quality is about 50-60/94, putting them about 5 meters away (in another room, 
with walls out of some wood) from each other the link quality is really 
really bad (< 20) and sometimes even no link can be established.

On Tuesday 23 December 2003 10:06, Andrew Findlay wrote:
> I have just installed a 3Com 3CRPAG175 802.11a/b/g card in a Dell Latitude
> C600 running Red Hat Linux 7.3. It is intended to work with a Linksys
> WRT54G access-point/switch/router. All these are off-the-shelf products
> bought in the UK.

I bought them in Germany, but is there a differenct?

>
> There are several problems with the 3Com card under madwifi:
>
> 	1)	It seems to be unable to associate with the AP unless
> 		the AP broadcasts the SSID. Further, the SSID must *not*
> 		be set using iwconfig!

I don't know wheather this is one of my problems, but I have connection 
problems, even when the cards are really close to each other.

>
> 	2)	Although the association initially reports 54M data rate,
> 		no packets get through until the rate has negotiated right
> 		down to 1M.
>
> 	3)	Ping tests show 3% duplicate packets and 2% loss.
>
> 	4)	It seems impossible to set the security mode to
> 		'restricted'.
Yes, this is true for me too.

> WEP in 64(40) bit mode works OK.

for me too.

> ifconfig shows a very lerge number of errors:

yes, for me too.

> As others have found, the card does not report any 802.11b rates at
> startup:

That's true and I cannot switch to b-only using iwpriv ath0 mode 1

Would be great if someone can solve this problem (if it's a driver problem). 
Michael

ps: sorry@moderator for using the wrong sender-address.