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Od: Christian Langanke <os2-wireless_users@2rosenthals.com> Glava
Izvorno E-sporo?ilo
Pošiljalec: os2-wireless_users-owner <os2-wireless_users-owner@2rosenthals.com>
Zadeva: [OS2Wireless] signal strength
Datum: Fri, 06 Jan 2006 23:48:25 +0100
Za: os2-wireless_users@2rosenthals.com

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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