Q: RSSI and wl command

[cyborgpunte]

Don't fully understand this:
have searched, but no answer that I understand

RT-AC68U with different fw.

With different values of "these" variables
((*txpower*, *TxPower*, *maxp*, *ccode*, *country*))
the command wl txpwr_target_max
gives results between 19 and 27.

RSSI between 42--57 same goes for dBm,
with same computer on same place.

Have I then different mW effect ??

TIA & BR

 

[kvic]

I think so.

The keys are *maxp* which set the max tx power for the given radio and *ccode* which limit available channels and ultimate upper limit of tx power for your country.

 

[john9527]

Sorry, but I'm not sure exactly what you are asking.

If what your are asking is how dBm relates to mW as a power descriptor, the two values are just different units of measurement for the smae thing (there are several dBm to mW converters on the web). kvic is correct in how the router parameters effect these numbers.

If your are asking how RSSI relates to those settings and why they are different, that's a much more complex question. You need to take into account things like noise levels, free space path loss, antenna characteristics and channel widths. There also can be some differences between manufacturers on how RSSI is calculated.

I don't know if you found these docs in your search, but I've found them to be very readable in describing how to interpret these numbers.

https://supportforums.cisco.com/document/49506/snr-rssi-eirp-and-free-space-path-loss
http://www.cwnp.com/uploads/jerome-henry_understanding-cell-size.pdf

BTW...there's a formula error in the first doc....see if you find it

 

[cyborgpunte]

Thanks, try to read your links later.

I rephrase a little, I ask of empirical reasons
Is it possible to get the result 27.00 27.00 27.00 ????
from the command "wl txpwr_target_max" in fw > 374.43
I thought not, and does that mean > 80mW ????