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Date:  Fri, 06 Jan 2006 23:48:25 +0100
Sender: os2-wireless_users-owner <os2-wireless_users-owner@2rosenthals.com>
Reply-To: os2-wireless_users@2rosenthals.com
From:  Christian Langanke <os2-wireless_users@2rosenthals.com>
To:  os2-wireless_users@2rosenthals.com
Subject: [OS2Wireless] signal strength

Jeroen Besse wrote:

>Hi,
>
>I noticed that, with my Atheros card, the genmac100 driver and
>xwlan212, the signal displayed is always between 60% (with change that
>the signal is lost completely) and 90% (with the notebook 20cm away
>from the access point).
>
>Within Windows, the signal strength is reported with much more range;
>I've seen working connections with a signal strength of around 20%.
>
>Is this a bug in genmac100, in the Win driver used within that, or in xwlan?
>
>  
>
Hi Jeroen,

the driver should report the signal strength within a certain value 
range, according to the NDIS interface specs, from -200 to -10. The 
genmac.dim converts that to a range of 0 to 190 and then to a range from 
0 to 60, matching the DIM spec of XWLAN (taken from the genprism.dim),. 
This is calculated to a percentage where 60 matches 100%.

Since AFAIK the OID clal for the signal strength is returned by the 
driver directly. there cannot be a genmac error. My method of 
calculating may be wrong at some point, but I don't know where. If 
somebody knows a better scheme please tell me.

BTW, with the genprism driver and artem card, I also was able to use a 
20% connection to get proper downloads etc.

Loosing the connection can also be a question of packet fragmentation, 
in rare cases either the driver on the client or the access point or 
both must be adjusted. I had such a problem that I could solve only by 
decreasing the fragmentation threshold on a former wlan router of mine 
to the default value of the WLAN router.

bye, Christian

-------------------------------------------------

Christian Langanke
COS2E & CWSE
Team OS/2 Ruhr e.V.
cla@clanganke.de

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