Controllerless Networks

Hi,

Customer reports poor coverage.

There are two IAP-93 in a building, ARM is set to Min power 18, Max power unlimited.

Howerver instants show power 14db on first and 16db on second....see screenshot

Why is this happening?

Notes:

-this is 3.2.0.2. Same behaviour with 3.2.0.4

-if I set power manualy, same behaviour.

Thanks for your advice...

Please share how do you have it configured in the ARM settings

###

arm
 wide-bands 5ghz
 min-tx-power 18
 max-tx-power 127
 band-steering-mode prefer-5ghz
 air-time-fairness-mode fair-access
 scanning

###

Thanks,

V.D.

If you double click on the that particular IAP , in the radio tab it gives you the option of changing the ARM assigned or administrator assigned .

And see you can assign it manually and if that's the case you might have to open a TAC case 

I had similar issue with IAP-105s initially but upgrading to firmware version 6.2.0.0-3.2.0.2_37229  corrected this problem for me.

Assigning power manually didn't help.

Well, I've finaly found where the strange power levels come from - "show log driver":

Mon May 20 15:47:47 2013:55         10.223106 wifi0: EIRP (Config: 18.0dBm, Set: 13.0dBm, AP Max: 20.5dBm, Reg Max: 20dBm), Conducted Power Set: 10.5dBm, Gain: 2.5dBm

So I did quick comparing to IAP-105 (now both APs are 3.3.0.x) and guess what - it is different:

(ARM set on both APs to min/max 18/18db)

IAP-105 :

Mon May 20 15:34:19 2013:155       148.824448 wifi1: Country Code Set to CZ
Mon May 20 15:34:19 2013:156       148.845601 wifi1:(3) EIRP (Config: 18.0dBm, Set: 7.5dBm, AP Max: 22.5dBm, Reg Max: 20dBm), Conducted Power Set: 5.0dBm, Gain: 2.5dBm
Mon May 20 15:34:19 2013:157       148.845682 wifi1: Channel Set to 11 (mesh-mode: 0, state: 5)
Mon May 20 15:34:19 2013:158       148.845728 wifi1: Internal Antenna Gain Set to 2.5 dBi for 2.4 GHz
Mon May 20 15:34:19 2013:159       148.845771 wifi1: Internal Antenna Selected
Mon May 20 15:34:19 2013:160       148.845810 wifi1: disabling 40Mhz
Mon May 20 15:34:19 2013:161       148.845861 wifi1: RADIO CONFIG DONE
Mon May 20 15:34:19 2013:162       148.845898  FREE MEMORY 71232(kB)
Mon May 20 15:34:19 2013:163       149.040352 Refetch EIRP
Mon May 20 15:34:19 2013:164       149.040405 wifi1:(5) EIRP (Config: 18.0dBm, Set: 18.0dBm, AP Max: 22.5dBm, Reg Max: 20dBm), Conducted Power Set: 15.5dBm, Gain: 2.5dBm

***  Real signal reading with INSSIDER around -25dB ***

*************


Compare to :IAP-92 + AP-ANT1( 3db/5db antenae, set in GUI)

Mon May 20 15:47:47 2013:50          9.826019 wifi0: Effective External Antenna Gain Set to 2.5 dBi (connecter loss 0.5) for 2.4 GHz (Configured Value: 3.0 dBi)
Mon May 20 15:47:47 2013:51         10.201628 wifi0: Country Code Set to CZ
Mon May 20 15:47:47 2013:52         10.222664 wifi0: EIRP (Config: 63.5dBm, Set: 13.0dBm, AP Max: 20.5dBm, Reg Max: 20dBm), Conducted Power Set: 10.5dBm, Gain: 2.5dBm
Mon May 20 15:47:47 2013:53         10.222796 wifi0: Channel Set to 6 (mesh-mode: 0, state: 5)
Mon May 20 15:47:47 2013:54         10.222869 wifi0: External Antenna Selected
Mon May 20 15:47:47 2013:55         10.223106 wifi0: EIRP (Config: 18.0dBm, Set: 13.0dBm, AP Max: 20.5dBm, Reg Max: 20dBm), Conducted Power Set: 10.5dBm, Gain: 2.5dBm
Mon

**** Signal reading in INSSIDER: -40 dB at same AP possition  ****

***************

Seem's that:

1) we have a REAL problem here, signal measured on PC is lower

2) AP92 driver code for some reason subtracts 5db (sometimes less)