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MVP
Posts: 1,111
Registered: ‎10-11-2011

Low EIRP on 11a radios after 6.2 upgrade

[ Edited ]

I recently upgraded to 6.2 and RSSI has been significantly lower for my daily laptop.  After looking into it, I found that the AP I usually associate to is running at a much lower EIRP than usual.  I started checking into other APs and found a downward trend in EIRP for most APs.  On 6.1, most APs were running around 18 - 21.5, but now the average is 12 - 15. My 11a ARM profiles are set to defaults, min/max EIRP are used. These settings were not modified after the upgrade.

 

I'm not confident that it's a 6.2 issue, but that's the last significant change that been made.  Anyone notice similar behavior on 6.2?  

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MVP
Posts: 4,301
Registered: ‎07-20-2011

Re: Low EIRP on 11a radios after 6.2 upgrade

 

What AOS version are you using ? and APs ?

Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
MVP
Posts: 1,111
Registered: ‎10-11-2011

Re: Low EIRP on 11a radios after 6.2 upgrade

6.2.1.3 & AP105.

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MVP
Posts: 1,111
Registered: ‎10-11-2011

Re: Low EIRP on 11a radios after 6.2 upgrade

In areas where I have more APs I'm seeing this downward trend.  In areas that contain APs that are less dense, they're running at a much higher EIRP.  I'm going through RF history right now to see if I can spot any trends.

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MVP
Posts: 4,301
Registered: ‎07-20-2011

Re: Low EIRP on 11a radios after 6.2 upgrade

[ Edited ]

 

In 6.2 they are added some ARM scanning enhancements for APs with no clients associated so will allow the ARM to calculate it power/channel adjusments much better. 

 

Also what are you using 20 or 40 Mhz channels ?

Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
Guru Elite
Posts: 21,281
Registered: ‎03-29-2007

Re: Low EIRP on 11a radios after 6.2 upgrade

[ Edited ]

Arm history should tell you why.

 

If you are using airwave the rf health report will tell you what access points have


thecompnerd wrote:

In areas where I have more APs I'm seeing this downward trend.  In areas that contain APs that are less dense, they're running at a much higher EIRP.  I'm going through RF history right now to see if I can spot any trends.



the most power/channel changes.



Colin Joseph
Aruba Customer Engineering

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MVP
Posts: 1,111
Registered: ‎10-11-2011

Re: Low EIRP on 11a radios after 6.2 upgrade

I'm using 20MHz channels.

 

It looks like a possible co-channel interference issue.  I'm seeing several APs sharing the same channel on the same floor.  I have client aware enabled and the noise threshold is set to default.  Maybe I'm not giving the APs any opportunity to change channels as a result of these settings.

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Guru Elite
Posts: 21,281
Registered: ‎03-29-2007

Re: Low EIRP on 11a radios after 6.2 upgrade

If you want to be super-conservative, you can turn of client-aware at night.



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

MVP
Posts: 1,111
Registered: ‎10-11-2011

Re: Low EIRP on 11a radios after 6.2 upgrade

Good call.  Will do that tonight.

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MVP
Posts: 1,111
Registered: ‎10-11-2011

Re: Low EIRP on 11a radios after 6.2 upgrade

Disabled client aware last night.  Came back this morning and re-enabled.  Channel reuse is a little bit better, but half of the APs are still operating at 9dBm.  Going to open up a TAC case.

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