Re: [Wifiadmin-users] Noise and Silence values

[Thanos P. <pan...@ce...>]

 From what I remember, I substracted 256 because our card readings were 
positive integers, and since I figured the results should be in dBs, I 
had to make them negative...So that's what I did. Its just as Rob said, 
its right to do it in some cards, and it is wrong on others.

Anyway I think it provides some proportional taste of the signal levels 
your clients are getting, either negative or positive. Any insights on a 
better way are welcome.

Rob Flickenger wrote:

>
> On Jun 23, 2005, at 1:38 PM, Christopher Ness wrote:
>
>> Why would we subtract 256 from the noise and silence values  gathered in
>> get_assoc() ?
>>
>> Was this to make up for a bug in hostap or the firmware?  Without
>> subtracting my values look more appropriate - like iwconfig reports  
>> them
>> at -43 and -92 respectfully.
>>
>> Sorry to flood the list, is anyone else out there too?
>
>
> The noise and signal values are completely arbitrary, and vary from  
> driver to driver.  I don't know of any reliable way to know if you  
> have received good values from what the kernel reports.  You have to  
> subtract 256 from Cisco cards, but not Prism cards (for example).
>
> --Rob
>
>
>
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