Why dont I get full EIRP from AP?

[Paul_Holmgren]

I try to do a test with creating a 5GHz link outdoor.

The link works but to know the maximum distance I can do with this AP/antenna combination I want to get the AP to use the maximum allowed EIRP.

But I only get half (500mW = 27dBm) instead of 30dBm.

this is my setting and status of radio.

ap6562-690AB4#sh wireless regulatory device-type ap6562 se
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# Channel Set Power(mW) Power (dBm) Placement DFS CAC(mins) TPC
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1 1-13 100 20 Indoor/Outdoor NA NA NA
2 36-48 200 23 Indoor Not Required 0 Not Required
3 52-64 100 20 Indoor Required 1 Not Required
4 52-64 200 23 Indoor Required 1 Required
5 100-116 500 27 Indoor/Outdoor Required 1 Not Required
6 100-116 1000 30 Indoor/Outdoor Required 1 Required
7 120-128 500 27 Indoor/Outdoor Required 10 Not Required
8 120-128 1000 30 Indoor/Outdoor Required 10 Required
9 132-140 500 27 Indoor/Outdoor Required 1 Not Required
10 132-140 1000 30 Indoor/Outdoor Required 1 Required
----------------------------------------------------------------------------------------------------
ap6562-690AB4#
Radio: 84-24-8D-69-0A-B4:R2, alias ap6562-690AB4:R2
STATE : On
PHY INFO : Bssid: 84-24-8D-69-0E-20 RF-Mode: 5GHz-wlan
ACCESS POINT : Name: ap6562-690AB4 Location: Test Placement: Outdoor
CHANNEL : Current: 100 Configured: 100 Width: 20MHz
TRANSMIT POWER : 17 dBm
ANTENNA USAGE : 2x2
MAXIMUM DATA RATES : Phy: 144 Mbps User: 108 Mbps
PHY SETTINGS : Short Preamble: N Dual Channel: N Spectrum Mgmt: Y
RATE SELECTION : Standard
ANTENNA DOWNTILT : Not-Supported
RADIO SHARE MODE : Off
TRANSMIT BEAMFORMING : -
MU-MIMO : Not-Supported
SCAN_AHEAD CHANNEL : -
ERP COEXISTENCE : ERP Protection: N Non-ERP detected: N Non-ERP associated: N
HT COEXISTENCE : HT Protection: no-protection, Non-HT detected: N
Current Channel Width: 20Mhz, reason: per configuration
Num of Mcast Streams : 0 (max:25)
Multicast streams :
# MP Mcast Streams : 0
WLAN MAP :
BSS-1 : Test* (*=primary)
Shutdown WLANs :
MESHPOINT map :
BSS MAP :
BSS-1 : basic-rates = 6 12 24
: supported-rates= 6 9 12 18 24 36 48 54 mcs-1s mcs-2s
Last error :

ap6562 84-24-8D-69-0A-B4
use profile default-ap6562
use rf-domain Test
hostname ap6562-690AB4
interface radio2
channel 100
power 30
wlan Test bss 1 primary
antenna-gain 10.0
no dynamic-chain-selection
ap6562-690AB4(config-device-84-24-8D-69-0A-B4)#end

AP is powered by a 802.3at capable switch.

If I fool the AP that I have a 7dBi antenna instead it amplifies the IR to 20dBm so its something I cant see.

Kind regards

Paul

[Timo1]

Yes, I'm sure.

max. 30dBm EIRP with 5dBi antenna gain the max. TX power:
25dBm for legacy data rates with 1 antenna chain
22dBm for 802.11n/ac data rates with 2 antenna chains

If you configure now antenna gain of 5dBi and TX power for 30dBm, AP will do 25dBm or 22dBm -> dynamic chain selection is enabled by default and responsible for this automatically power changes.

[Paul_Holmgren]

Hi,

Are you shure?

Is it possible that you mixing up that you can calculate +3dBm from a MIMO signal if you whant it to reach further instead of deliver more data when designing, but the regulation is on EIRP an that will not get any higher from a dual antenna?

[aholden]

Hi Paul

A word of caution, configuration of a wireless access point to fool it to exceed the FCC defined limits is a violation of the FCC regulations and could leave you open to fines if detected.

Rather than try to push a single AP to provide coverage over a large area, please do a proper Rf- Survey to determine the number of APs required to support you site

[Paul_Holmgren]

I know,

the problem is its not exceeding regulations limits inside the AP list.

see this.

6 100-116 1000 30 Indoor/Outdoor Required 1 Required