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 From:  Manuel Kasper <mk at neon1 dot net>
 To:  Alexandre Gambati <gambati at hotmail dot com>
 Cc:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] Link Quality and Signal Strength Meter
 Date:  Sun, 13 Jul 2003 09:14:51 +0200 (CEST)
On Sat, 12 Jul 2003, Alexandre Gambati wrote:

>   I'm using monowall in my engineering graduate's project.  I'm having some
> difficulties to interpret the signal values showed by monowall in wireless
> secction.
>   What's the unity for sinal and noise meters (dBW, dBm, dBmicro, ...)?
>   I think "Quality" must be the Link's SNR ratio.  That's right?

Those values come straight from FreeBSD's wicontrol; here's some
information from its manpage:

Display the cached signal strength information maintained by the
wi(4) driver.  The driver retains information about signal
strength and noise level for packets received from different
hosts.  The signal strength and noise level values are displayed
in units of dBms.  The signal quality values is produced by sub-
tracting the noise level from the signal strength (i.e. less
noise and better signal yields better signal quality).