Wireless point to point signal strength monitoring tool

Ricardo Galli gallir at uib.es
Tue Jun 17 04:51:36 EDT 2003


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On Tuesday 17 June 2003 10:38, Theodor Milkov shaped the electrons to shout:
> Unfortunately no one seems to know what exactly the numbers reported by
> hostap mean (i.e. how they map to dB). But that's already another
> question :-)

We discussed already month ago, I've reported also a bug is how was calculated 
in previous versions (i was doing tracking 
http://mnm.uib.es/~gallir/80211tracking/data4.png), it was done in two 
different ways.

What I assume is that the number is lineal to dBM, there are still two usages 
(I didn't check them in last version, in previous versions, before november 
2002, there was a bug):

In hostap_wlan.h

/* Macro for converting signal levels (range 27 .. 154) to wireless ext
 * dBm value with some accuracy */
#define HFA384X_LEVEL_TO_dBm(v) 0x100 + (v) * 100 / 255 - 100


/* Macro for converting signal/silence levels (RSSI) from RX descriptor to
 * dBm */
#define HFA384X_RSSI_LEVEL_TO_dBm(v) ((v) - 100)

Regards,

- -- 
  ricardo galli       GPG id C8114D34
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