Introduction : For troublshooting purpose or check the AP's dBm in detail, need to verify "Conducted Power Set from configuration" and "external dBi which is provoided via AP installation process"
Environment : Controller : A3600, AP : AP105
Network Topology : Controller --- PoE switch ---- AP-105
Answer : Normally, checking the AP's dBm from "show ap active"
(controller) #show ap ac
Active AP Table
---------------
Name Group IP Address 11g Clients 11g Ch/EIRP/MaxEIRP 11a Clients 11a Ch/EIRP/MaxEIRP AP Type Flags Uptime Outer IP
---- ----- ---------- ----------- ------------------- ----------- ------------------- ------- ----- ------ --------
105-1 dBm-Verify 10.0.0.2 0 AP:HT:13/15/22.5 0 AP:HT:48-/20/20 105 R2Bda 23h:12m:41s 172.16.0.2
For the output of above, we can get the information that AP-name 105-1 is set 15dBm in 2.4G and 20dBm in 5G.
But there is no information what's the Conducted Power Set from controller and ANT's dBi.
For verifying the dBm in detail, need to check below command.
(controller) #show ap debug driver-log ap-name 105-1
80.948974 wifi1: EIRP (Config: 15.0dBm, Set: 15.0dBm, AP Max: 22.5dBm, Reg Max: 29dBm), Conducted Power Set: 12.5dBm, Gain: 2.5dBm
Thu Aug 8 04:26:49 2013:649 83246.192239 wifi1: Channel Set to 13 (mesh-mode: 0, state: 5)
Thu Aug 8 04:26:49 2013:650 83246.192284 wifi1: disabling 40Mhz
Thu Aug 8 04:26:49 2013:651 83246.192334 wifi1: RADIO CONFIG DONE
Thu Aug 8 04:33:37 2013:652 83653.933982 wifi1: Scheduling RADIO CONFIG update
Thu Aug 8 04:33:37 2013:653 83653.954770 wifi1: EIRP (Config: 15.0dBm, Set: 15.0dBm, AP Max: 22.5dBm, Reg Max: 29dBm), Conducted Power Set: 12.5dBm, Gain: 2.5dBm
Thu Aug 8 04:33:37 2013:654 83653.954853 wifi1: Channel Set to 9 (mesh-mode: 0, state: 5)
Thu Aug 8 04:33:37 2013:655 83653.954898 wifi1: disabling 40Mhz
Thu Aug 8 04:33:37 2013:656 83653.954947 wifi1: RADIO CONFIG DONE
Driver Log
--------------------------------------------------------
Current Log Level 3 Log Counter 657 Timestamp 83689.127525
652 83653.933982 wifi1: Scheduling RADIO CONFIG update
653 83653.954770 wifi1: EIRP (Config: 15.0dBm, Set: 15.0dBm, AP Max: 22.5dBm, Reg Max: 29dBm), Conducted Power Set: 12.5dBm, Gain: 2.5dBm
654 83653.954853 wifi1: Channel Set to 9 (mesh-mode: 0, state: 5)
655 83653.954898 wifi1: disabling 40Mhz
656 83653.954947 wifi1: RADIO CONFIG DONE
According to the output information, AP-105 model have 2.5dBm ANT Gain by default.
For the case external AP such as AP-104, AP-92, AP-134, it's useful to verify the external ANT's gain and regualtory MAX dBm too.
Verification : ArubaOS (MODEL: Aruba3600), Version 6.1.3.5 (build 35523)