Re: Prism Monitoring header signal portion to dBi

From: Gerald Britton (
Date: 2002-07-03 16:08:50 UTC

On Wed, Jul 03, 2002 at 11:44:30AM -0400, Vincas Ciziunas wrote:
> On Wed, 3 Jul 2002, Gerald Britton wrote:
> > On Wed, Jul 03, 2002 at 10:41:38AM -0400, Vincas Ciziunas wrote:
> > > I've gotten a 0x90 on it. I know the scale doesn't start at 0 dBm, but
> > > isn't it roughly a midpt?
> >
> > This is almost certainly firmware dependant i guess.. *sigh*
> > At one point, I read a post which said there was a lookup table in the
> > firmware for mapping values to actual dBm values.
> More than likely is. But, hmm...I just noticed I also get some things
> where the signal is 0. So maybe my 0x1b to 0x9a thing isn't quite
> right. I get 0x90 when I'm near an access point. Go figure.

Seems to top out at roughly 0x3f for me, i've never gotten packets with a signal strength of 0 listed in them (hrm.. though I have only been looking at beacons in the testing i've been doing). Lowest i've seen has been 3 i think.

My card used to report that larger range in the rx headers, it changed at some point when i upgraded its firmware. The signal strength mibs do report that range which seems to go upto something in the 0x90's or so.

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