Re: Linksys WUSB11 V 2.8; can't compile at76c503a sources

HI Ian,

On Fri, 23 Jan 2004, Ian B. Jacobs wrote:

> > Please check if both sides use the same preamble (short or long),
>
> I do not believe the BEFW11P1 (with my current firmware)
> supports preamble settings. I can find nothing through
> google or in my router's documentation.

OK, then switch the preamble in the WUSB11:
long preamble (default): iwpriv wlan0 short_preamble 0
short preamble:	iwpriv wlan0 short_preamble 1

With a short preamble in the driver and if the AP does not announce using
"short preamble", you may get no connection to the router. After
	iwpriv wlan0 set_debug 0x180003

you should see an error like

"wlan0: 0xxxxxx does not support short preamble"

in the syslog.

> When I set the WUSB11 to tx of 2M:
>
>       iwconfig wlan0 rate 2M
>
> I get MUCH better behavior. For instance: 2% packet loss after
> a ping of 40 packets.
>
> At a rate of 5.5M, I still have problems.
> ...
> Thank you for your advice. Do you think that my
> problems at higher transfer rates are due to (1) router?
> (2) WUSB11 driver? (3) environment? (4) kernel (2.4.22-1)?
> (5) other factors?

Difficult to say from a distance and without a trace of the channel, e.g.
by a Prism2/3 device. Couldn't you trace the connection with your WPC11,
which is, AFAIK, a Prism2 device? Put it into monitor mode on a fixed
channel and use a decent ethereal version to capture the traffic.
I could send you the commands for the wlan-ng config tool.

What's your usual  throughput with the WPC11?

/Jörg