topic Re: Ruckus Power Settings in To Be Moved

Ruckus Power Settings

ali_db0udsohr2q — Wed, 05 Jul 2017 19:27:35 GMT

Trying to work in Ekahau and figure this out. So if I set an AP power to 4dBm or 3dBm in Rukus what would that equate to?

Am
I taking the full power value of the band for instance 20dB and then if I choose -3dBm in Ruckus that would change to 10dB and if I want 4dBm I can do -7dBm approximately?

Also I can't seem to find a command that will give me the EIRP in the AP. Tried this:

rkscli: get txpower wifi0
wifi0 transmit power set to -3 dB from max power

So is that telling me that the AP power is 17dBm?

Re: Ruckus Power Settings

abilash_p_r — Wed, 05 Jul 2017 19:57:48 GMT

Hi Ali,

Please let me know the AP Model/Country Code that you are using; I would find the Max Tx power of that AP.

Regards,
Abilash PR.

Re: Ruckus Power Settings

ali_db0udsohr2q — Wed, 05 Jul 2017 19:59:35 GMT

R610 and using it in the US. However that still won't answer my question. Need to know how Ruckus does its calculation?

Re: Ruckus Power Settings

abilash_p_r — Wed, 05 Jul 2017 21:47:31 GMT

Hi Ali,

"I taking the full power value of the band for instance 20dB and then if I choose -3dB in Ruckus that would change to 10dB and if I want 4dB I can do -7dB approximately?"

If this is your question ? (Correcting the dBms to dB.)

You are correct, lets assume that when Tx power is set to auto/full it is 20dB, when you reduce it to -3dB then the power would be half'd which is 10dB, so if you want 4dB then it is -7dB by rules of 10's & 3's (-10+3 = 20 dB/10 = 2dB * 2 = 4dB).

Regards,
Abilash PR.

Re: Ruckus Power Settings

ali_db0udsohr2q — Fri, 07 Jul 2017 15:40:54 GMT

Thanks so much for that information and correction. So using what you explained above if I plan AP's with 4dB in Ekahau I will change the value in the VSZ to -7dB. Similarly the chart below makes sense?

But that ads some confusion too. What is Min then and I'm guessing Full/Auto would be 20dB? Also looking at the chart below 15dB to 19dB there is no way to set that as the option is not available in Ruckus?

Also is there no way to see in the dashboard what each AP is transmitting at? All I see is the Tx Power Adjustment -3dB but it would be nice to be able to see it in a normal way if it is at 14, 17 or 20 etc.

Re: Ruckus Power Settings

mitchell_axtell — Mon, 10 Jul 2017 05:50:07 GMT

-3dB on a radio is not 10dB, it is -3dB from peak, so 17dB. As dB is a logarithmic unit, -3dB is effectively half of the noise. It is not half of the dB value.

dB and dBm cannot be compared directly. dB is an absolute value- the strength of a noise source independent of the antenna gain/loss, interference and other values. dBm is the received power level of a signal in reference to 1 milliwatt, which is why it is shown in very low numbers in site survey programs like Ekahau (-10 to -100, usually). Halving the dB level of a radio is not necessarily going to halve the dBm figure the client displays, as there are other factors at play that affect this.

Re: Ruckus Power Settings

ali_db0udsohr2q — Mon, 10 Jul 2017 13:33:42 GMT

Thank you that's what I am trying to understand how Ruckus does it. If the values in the figure are simply subtract from the peak value like you said -3dB will be 17dB and similarly -4dB will be 16dB and so on or is it actually adding the attenuation (BTW read that some where that is why asking). So far I haven't been able to find any official documentation on this which is pretty surprising. If you know of any would you kindly share the link? Thank you

Re: Ruckus Power Settings

abilash_p_r — Mon, 10 Jul 2017 17:04:16 GMT

Hi Ali,

I am sorry, Mitchell is right; I got wrong with Units; which changed entire calculation.

AP:R610, Country Code US; Firmware:3.5.1.

Auto/Max 2.4Ghz Radio 18dBm
Auto/Max 5Ghz Radio 20dBm

Min 5Ghz Radio 2dBm
Min 2.4Ghz Radio it is usually 1dBm; this should still need verification.

Now, you could calculate your Tx accordingly, say if you set the Tx power -1dB then your Tx power of AP would 17dBm in 2.4Ghz Radio and 19dBm 5Ghz Radio.

Please note, this would vary according to country code and MCS rate.

Regards,
Abilash PR.

Re: Ruckus Power Settings

ali_db0udsohr2q — Wed, 09 Aug 2017 14:03:25 GMT

I don't have an option to run that command "iwconfig wlan0". I am using R600 with VSz HS.

And looks like I can't setup the power level from 1db to 9db since the menu option jumps to "Min" from -10db? There is no way for me to setup the Tx power on the Ruckus AP's to 3db in VSz HS?

Re: Ruckus Power Settings

richard_mazuru — Sat, 04 Aug 2018 16:36:42 GMT

Am largely using T301s and R300 in my environment and i want to reduce the transmit power of the certain APS they are being controlled by zone director 3000

Re: Ruckus Power Settings

ali_db0udsohr2q — Wed, 20 Mar 2019 22:33:09 GMT

Can you tell me how can I access the screen to run the iwconfig command?

Re: Ruckus Power Settings

michael_brado — Fri, 22 Mar 2019 23:15:36 GMT

Sorry, that requires Shell access.

Re: Ruckus Power Settings

eightohtwoeleve — Fri, 24 Jan 2020 20:37:27 GMT

Is there anyway to get this result ported over into regular shell so that we can see the current dBm values? .. this is extremely useful to those of us that need this data in order to plan out surveys.

Re: Ruckus Power Settings

michael_brado — Fri, 24 Jan 2020 21:39:39 GMT

The correct and most effective answer is, please open a ticket and file a Feature Request.
Product Marketing has long pushed for all Customer features to be available in our WebUI,
not require CLI and least of all shell access.
And Developers consider anything not currently in software, to be a new WebUI function, and
ask that it be documented in a FR (filed by your TAC engineer if you open a case and ask for it).
These do get visibility, but are weighed against the many other software feature requests pending.

Re: Ruckus Power Settings

eightohtwoeleve — Mon, 27 Jan 2020 15:18:17 GMT

When creating a ticket, how does one choose Feature Request, it isn't a choice?

Re: Ruckus Power Settings

carsten_buchena — Wed, 16 Nov 2022 11:42:42 GMT

Sorry, although this is an old threat, I have to disagree to this comment. It confused the hell out of me...

The correct statement would be:
"Let's assume that when Tx power is set to aut/full it is 20dB = 100mW, when you reduce it by -3dB then the power would be half'd which is 17dB = 50mW, so if you want 4dB then it is -16dB which reduces it to 4dB = 2.5mW."

In short: -3dB reduces the power (measured in W) by half.

This article helps, have a look at the table further down:
https://www.rapidtables.com/electric/dBm.html