topic Radio power being limited on some APs not others in ExtremeCloud IQ

Radio power being limited on some APs not others

w1f1n00b — Mon, 10 May 2021 21:49:08 GMT

Seeing the following warning in buffered log on some APs

Warning - ah_dcd: wifi: wifi1: Power 16 exceeds HW limit(14), forced to 14

Region Code: FCC

Country Code: 840

I’ve checked and have other APs, same model, FW, etc. that are running at powers all the way up to 20. Any ideas why some APs acting differently?

Re: Radio power being limited on some APs not others

Scott_Whall — Mon, 10 May 2021 22:00:46 GMT

Hello John -

For those APs, are they getting full AT power?

What channels are getting limited to 14? When you say other APs with same firmware are getting 20, are they also on the same channel?

Re: Radio power being limited on some APs not others

w1f1n00b — Mon, 10 May 2021 22:05:57 GMT

AP is running at AT power.

Looking through all APs it appears this is happening across the board for ch36 (40MHz). Is that channel regulated differently than 40-48?

Re: Radio power being limited on some APs not others

w1f1n00b — Tue, 18 May 2021 20:03:43 GMT

@Sam Pirok , any idea if ch36 is regulated differently than other UNII-1 channels in USA?

Re: Radio power being limited on some APs not others

SamPirok — Wed, 19 May 2021 01:27:36 GMT

Hi @w1f1n00b, it shouldn’t be regulated differently based on what I’m seeing in the 802.11 a/h/j/n/ac/ax documentation. If you have the time to look in to this, I’d recommend pulling some tech data and opening a case so we can dig in to this with you a bit more.

Re: Radio power being limited on some APs not others

w1f1n00b — Tue, 08 Jun 2021 18:58:28 GMT

I was able to determine this is only happening on ch36 when radio is set to 40MHz wide.

GTAC closed the case after stating it was FCC regulation, as the regulatory limit reported in CLI is 14. I’ve reached out to my SE to see if he’s able to provide any more detailed info.

Re: Radio power being limited on some APs not others

jason_hills — Sun, 13 Jun 2021 16:19:21 GMT

Is this a specific model, as the AP150W is limiting its wifi1 intro 8dBm but other APs in same VIQ and radii profile at operating tat the max power in the radio profile.
APs powered by AC power, one is powered by poe+.

I have a posted a question in the community