ap7522 do not assign max radio power automatically

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We have have exchanged old ap650 through newer ap7522. In the smart-rf-policy which is bound to the used rf-domain the max assignable power is configured with 20dBm. Whith the old ap650 this worked without problems. Now the new APs only transmit with 13dBm. What did we do wrong?

Here is our used configuration:

smart-rf-policy SRF-DEXXX01
assignable-power 5GHz max 20
assignable-power 5GHz min 9
assignable-power 2.4GHz max 20
assignable-power 2.4GHz min 9
channel-list 2.4GHz 1,5,9,13
channel-width 5GHz auto
no neighbor-recovery

rf-domain RF-DEXXX01
location XXX
contact IT.Network
timezone Europe/Berlin
country-code de
use smart-rf-policy SRF-DEXXX01
control-vlan 989

profile ap7522 DEXXX01-AP7522
bridge vlan 705
bridging-mode tunnel
ip arp trust
ip igmp snooping
ip igmp snooping querier
ipv6 mld snooping
ipv6 mld snooping querier
bridge vlan 900
bridging-mode tunnel
ip arp trust
ip igmp snooping
ip igmp snooping querier
ipv6 mld snooping
ipv6 mld snooping querier
autoinstall configuration
autoinstall firmware
autoinstall start-interval 1
use radius-server-policy RADIUS-ON_DUALRADIO
crypto ikev1 policy ikev1-default
isakmp-proposal default encryption aes-256 group 2 hash sha
crypto ikev2 policy ikev2-default
isakmp-proposal default encryption aes-256 group 2 hash sha
crypto ipsec transform-set default esp-aes-256 esp-sha-hmac
crypto ikev1 remote-vpn
crypto ikev2 remote-vpn
crypto auto-ipsec-secure
crypto load-management
crypto remote-vpn-client
interface radio1
data-rates gn
beacon dtim-period 10
wlan WLAN-XXX0 bss 1 primary
wlan WLAN-XXX1 bss 2 primary
wlan WLAN-XXX2 bss 3 primary
interface radio2
data-rates an
beacon dtim-period 10
wlan WLAN-XXX0 bss 1 primary
interface ge1
switchport mode trunk
switchport trunk native vlan 989
no switchport trunk native tagged
switchport trunk allowed vlan 300,304,989
use mac-access-list in PERMIT-ARP-AND-IPv4-AND-MINT
no cdp receive
no cdp transmit
interface vlan300
description WLAN-XXX0
interface vlan304
description WLAN-XXX1
interface vlan989
description WLAN-MGMT
ip address dhcp
ip dhcp client request options all
interface pppoe1
use management-policy APR_DEZENTRAL_DUALRADIO
use firewall-policy default
service pm sys-restart
router ospf
l2tpv3 tunnel vlan900
peer 1 ip-address X.X.X.X hostname XXXX router-id any
peer 2 ip-address X.X.X.X hostname XXXX router-id any
session vlan705 pseudowire-id 705 traffic-source vlan 705
session vlan900 pseudowire-id 900 traffic-source vlan 900
establishment-criteria rf-domain-manager
l2tpv3 inter-tunnel-bridging

This is our Controller and Firmware Version:

VX9000 version 5.8.2.0-030R
Copyright (c) 2004-2015 Symbol Technologies, Inc. All rights reserved.
Booted from secondary

XXXXX uptime is 423 days, 07 hours 21 minutes
CPU is Intel(R) Xeon(R) CPU E5-2690 0 @ 2.90GHz
Base ethernet MAC address is XX-XX-XX-XX-XX-XX
System serial number is XXXXX
Model number is VX-9000
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Daniel H

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Posted 2 years ago

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Ondrej Lepa, Employee

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Hi Daniel,

could you tell me what is model number (part number) of your AP7522?

There are differences in regards to internal / external antenna gain which is not added to the count.
Moreover, AP7522 uses MIMO MUX which adds some differences to radio power counts. 

Please share output for following commands:
VX# show version on RFDM/AP
VX# show wireless radio detail on RFDM/AP
VX# show wireless regulatory device-type ap7522 <ISO country code>
Regards,
Ondrej
(Edited)
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Daniel H

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Hi Ondrej,

thnks for your reply.
Here are the requested outputs:

AP7522 version 5.8.2.0-030R
Copyright (c) 2004-2015 Symbol Technologies, Inc. All rights reserved.
Booted from secondary

DEXXX01-APR029 uptime is 53 days, 18 hours 27 minutes
CPU is ARMv7
Base ethernet MAC address is 84-24-8D-XX-XX-XX
System serial number is XXXXX
Model number is AP-7522-67030-EU

Radio: 84-24-8D-XX-XX-XX:R1, alias DEXXX01-APR029:R1
STATE : On
PHY INFO : Bssid: 84-24-8D-XX-XX-XX RF-Mode: 2.4GHz-wlan
ACCESS POINT : Name: DEXXX01-APR029 Location: Holzwickede,_RP1 Placement: Indoor
CHANNEL : Current: 5 Configured: smt Width: 20MHz
TRANSMIT POWER : 13 dBm
ANTENNA USAGE : 2x2
MAXIMUM DATA RATES : Phy: 200 Mbps User: 150 Mbps
PHY SETTINGS : Short Preamble: N Dual Channel: N Spectrum Mgmt: N
RATE SELECTION : Standard
ANTENNA DOWNTILT : Not-Supported
RADIO SHARE MODE : Off
TRANSMIT BEAMFORMING : Enabled
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 : WLAN-XXX0* (*=primary)
BSS-2 : WLAN-XXX1* (*=primary)
BSS-3 : WLAN-XXX2* (*=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-s1 mcs-s2
BSS-2 : basic-rates = 6 12 24
: supported-rates= 6 9 12 18 24 36 48 54 mcs-s1 mcs-s2
BSS-3 : basic-rates = 6 12 24
: supported-rates= 6 9 12 18 24 36 48 54 mcs-s1 mcs-s2
Last error :

Radio: 84-24-8D-XX-XX-XX:R2, alias DEXXX01-APR029:R2
STATE : On
PHY INFO : Bssid: 84-24-8D-XX-XX-XX RF-Mode: 5GHz-wlan
ACCESS POINT : Name: DEXXX01-APR029 Location: Holzwickede,_RP1 Placement: Indoor
CHANNEL : Current: 36ww Configured: smt Width: 20/40/80MHz
TRANSMIT POWER : 13 dBm
ANTENNA USAGE : 2x2
MAXIMUM DATA RATES : Phy: 866 Mbps User: 650 Mbps
PHY SETTINGS : Short Preamble: N Dual Channel: N Spectrum Mgmt: N
RATE SELECTION : Standard
ANTENNA DOWNTILT : Not-Supported
RADIO SHARE MODE : Off
TRANSMIT BEAMFORMING : Enabled
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, 40MHz and 80MHz
Num of Mcast Streams : 0 (max:25)
Multicast streams :
# MP Mcast Streams : 0
WLAN MAP :
BSS-1 : WLAN-XXX0* (*=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-s1 mcs-s2
Last error :

Total number of radios displayed: 2

DEHZE01-WSW004#show wireless regulatory device-type ap7522 de
----------------------------------------------------------------------------------------------------
# Channel Set Power(mW) Power (dBm) Placement DFS CAC(mins) TPC
----------------------------------------------------------------------------------------------------
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
----------------------------------------------------------------------------------------------------
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Ondrej Lepa, Employee

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Hi Daniel,

AP-7522-67030-EU is internal antenna SKU.
That brings maximum transmit power on two antennas to following values
Internal Antennas (AP-7522-67030-xx)
2.4 GHz Band : 23 dBm
5 GHz Band : 23 dBm
Given by TPC / regulatory you also suit into group 2 - channels 36 - 48 are limited to max 23 dBm.



Data sheet for AP7522 says that internal antenna gain is 4 dBi for 2.4GHz and 6 dBi for 5GHz band. As your antenna mode is 2x2 you are using the diplexor attenuation + antenna gain.

The maximum possible power could be then seen below.
I manually set too high value - in brackets - and system automatically attenuates Tx power to comply with regulations. Also observe that AP7532 behaves the same way.



Now the math:
maximum allowed power + diplexor attenuation + MIMO substraction (when used) + antenna gain = Tx power
As far as I remember those values are pretty similar to 2 dBi for diplexor and 2 dBi for MIMO
R1 (no MIMO): 20 dBm = 18 dBm - ~2 dBi + 4 dBi
R2 (no MIMO): 23 dBm = 20 dBm - ~3 dBi + 6 dBi
 
R1 (MIMO): 20 dBm = 18 dBm - ~2 dBi - 2 dBi + 4 dBi
R2 (MIMO): 23 dBm = 20 dBm - ~3 dBi - 2 dBi + 6 dBi
So why is your AP using Tx power 13 dBm? 

Smart-RF basically adjust the radio Tx power to satisfy proper coverage.
It takes in cosideration clients connected and their Tx power, neigboring APs, external and non-wifi interferences end other factors. Show radio power also does not count antenna gain be default - this is driven by power tables loaded into AP driver.

If algorithm does not consider that necessary, it won't ever use the full power.

Let me know if you have any other questions.

Regards,
Ondrej
(Edited)
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Daniel H

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Hi Ondrej,

thank you for your answer but I don't understand your callculation at all. So you say that the Tx power ist calculated as follows:

maximum allowed power + diplexor attenuation + MIMO substraction (when used) + antenna gain = Tx power

So in my calculation it would bei the following transmit power at 2,4GHz:

20dBm + (-2dBi) + (-2dBi) + 4 dBi = 20dBm

So the transmit power should be 20 dBm or do I think wrong?

The other thing is, that we have exhanged 39 AP650 with 39 AP7522. Now all of the 39 APs transmit with 13dBm, so if they take consideration of neighbours and etc., why they all transmit with 13dBm and no one of them uses 12dBm or 14 dBm or another value?

Regards,
Daniel
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Ondrej Lepa, Employee

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Hi Daniel,

The calculation is to show differences in EIRP and Tx power shown in CLI.
You may think of it also like this:
Tx power shown in CLI + diplexor attenuation + MIMO subtraction + antenna gain = EIRP
Apart of this - AP7522 is completely different piece of hardware than AP650.
Radio hardware is more powerful, belongs to different class and has better sensitivity. 

You shall not expect that different platform will use same power tables (just consider antenna radiation patterns). Also, exchanging APs one-for-one is never an easy process. This always require pre- / post-deployment survey to confirm coverage.

It is highly possible that AP7522 does not need the same level of Tx power to provide same coverage area as AP650 did. 

If you consider 13 dBm to be a faulty value, please examine following command 
show smart-rf radio energy on <RF-Domain name>
Or share Smart-RF report collected with this one
remote-debug copy-smart-rf-report rf-domain <RF-Domain name> write ftp://user:pass@IP/file
Regards,

Ondrej
(Edited)