wifi1 not running at manually selected power.

[olof]

I have set my AP's to run at 17dBm power on wifi1.

However, some of them are only running at 14dBm and some at 12dBm.

As you can see from CLI output, ACSP is disabled.

show acsp

Interface Channel select state Primary channel Channel width Power ctrl state Tx power(dbm) Use Last Selection

--------- --------------------- ---------------- ------------- --------------------- ------------- ---------------------

Wifi0 Disable(Link down) Down 20 Disable(Link down) Down Channel:No Power:No

Wifi1 Disable(User disable) 56* 20 Disable(User disable) 12* Channel:No Power:No

Here is a sample output from show interface wifi1 on an AP with 17dBm shown in GUI.

```

show interface wifi1

AC=access category; be=best-effort; bg=background; vi=video; vo=voice;

AIFS=Arbitration Inter-Frame Space; Txoplimit=transmission opportunity limit;

IDP=Intrusion detection and prevention; BGSCAN=background scan; PS=Power save;

HT=High throughput; A-MPDU=Aggregate MAC protocol data unit;

DFS=Dynamic Frequency Selection; CU=Channel Utilization;

EIRP=Effective Isotropic Radiated Power (Transmit Power + Max Antenna Gain + Max TX Chains Gain);

Summary state=Good;

Mode=access; Radio disabled=no;

Admin state=enabled; Operational state=up;

MAC addr=d854:a216:1720; MTU=1500;

Freq(Chan)=5220Mhz(44*); EIRP power=22.77*dBm(12dBm + 6.00dBi + 4.77dBi); Diversity=enabled;

Tx range=300m; Noise floor=-95dBm; Tx power control=disabled;

....

Board limit=21dBm(1) 21dBm(2) 21dBm(3) -(4) ; Regulatory limit=17dBm(1) 14dBm(2) 12dBm(3) -(4) ;

```

and here is sample output from an AP with 12 dBm shown in GUI...

```

show interface wifi1

AC=access category; be=best-effort; bg=background; vi=video; vo=voice;

AIFS=Arbitration Inter-Frame Space; Txoplimit=transmission opportunity limit;

IDP=Intrusion detection and prevention; BGSCAN=background scan; PS=Power save;

HT=High throughput; A-MPDU=Aggregate MAC protocol data unit;

DFS=Dynamic Frequency Selection; CU=Channel Utilization;

EIRP=Effective Isotropic Radiated Power (Transmit Power + Max Antenna Gain + Max TX Chains Gain);

Summary state=High collision;

Mode=access; Radio disabled=no;

Admin state=enabled; Operational state=up;

MAC addr=d854:a216:1ca0; MTU=1500;

Freq(Chan)=5260Mhz(52*); EIRP power=22.77*dBm(12dBm + 6.00dBi + 4.77dBi); Diversity=enabled;

Tx range=300m; Noise floor=-95dBm; Tx power control=disabled;

...

Board limit=21dBm(1) 21dBm(2) 21dBm(3) -(4) ; Regulatory limit=17dBm(1) 14dBm(2) 12dBm(3) -(4) ;

```

[bpowers]

The data sheet shows it per frequency.

Max EIRP (dBm):

2400 MHz to 2500 MHz: 27 dBm

5250 MHz to 5350 MHz: 30 dBm

5725 MHz to 5875 MHz :30 dBm

Not per 802.11 technology (a/b/g/n/ac). So it matters not if the AP is .11g only or .11ac or if the radio profile is configured as such. The max limits are per frequency range based on the regulatory body (country code applied to the hardware).

[olof]

Thanks, how can I see what maximum power is on AC? This documents only mentions transmit power on 802.11g...

https://www.aerohive.com/wp-content/uploads/Aerohive_Datasheet_AP122.pdf

[bpowers]

The four values would be for a 4x4:4 device with four spatial streams. In the AP230 case, the 4th value is null as there's no value. Basically the AP subtracts ~1.77 dB of power per spatial stream to stay within regulatory limits.

You can see this because of the actual gain per antenna here:

Freq(Chan)=5220Mhz(44*); EIRP power=22.77*dBm(12dBm + 6.00dBi + 4.77dBi); Diversity=enabled;

This 4.77dBi gain is offset by the reduction in the max output power to keep things in balance. You can see these values change if you set the radio to only operate at 1 or 2 spatial streams vs. the default of 3.

[rickywong]

When the AP boot up, using console cable and you can find the related message also.

[rickywong]

Hello Sir, Not all AP support up 20 as maximum power.

You need to check out the datasheet of that AP to confirm the maximum power.