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-   -   Calculation of signal levels? (http://www.linuxquestions.org/questions/linux-wireless-networking-41/calculation-of-signal-levels-301488/)

ikletti 03-14-2005 11:32 AM

Calculation of signal levels?
 
I have two different wireless network cards, a Cisco Aironet 350 (AIR-LMC352),
and the Centrino (ipw2100) built into my current Laptop.

When looking at the received signal strength that is reported, I came across the
following: Using
Code:

iwconfig <interface>
shows a signal strength in dBm that is nearly identical for the Centrino and the
Aironet client adapter. Looking at the reported signal strength with
Code:

cat /proc/net/wireless
results in a three digit number ranging between 0 and 254, depending on the
received signal strength (those numbers are different for the two client adapters).

Where can I find the information about the factor that is used for the digit/dBm
conversion?

Thanks, Ingo.

JohnBoy 03-22-2005 02:07 AM

I've looked for more info about this, myself. I'm not sure I understand your question though: are you asking how the 0-254 value gets converted to dBm or are you asking if DOES get converted to dBm (as opposed to there being some other file where the signal strength is reported by the kernel, in dBm)?

One way to acquire more info from the Aironet card is to look in /proc/drivers/aironet/ethN. This dir contains the following entries: Stats, Status, Config, ESSID, WEP (or something for the key), and two other files, each of which reports deltas related to two of the files already mentioned.

ikletti 03-22-2005 04:46 AM

Hello Johnboy,

Quote:

are you asking how the 0-254 value gets converted to dBm or are you asking if DOES get converted to dBm (as opposed to there being some other file where the signal strength is reported by the kernel, in dBm)?
Yes, thatīs exactly what I want to know: Is there some file where this information is stored or is this factor included in the modules/drivers that are used for the specific client cards?

Quote:

One way to acquire more info from the Aironet card is to look in /proc/drivers/aironet/ethN. This dir contains the following entries: Stats, Status, Config, ESSID, WEP (or something for the key), and two other files, each of which reports deltas related to two of the files already mentioned.
Thanks for pointing me to that directory, Iīll see if I can use some of the info thatīs in it.

Bye,

Ingo.


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