9120AXE with 13 dBi

[littleyoda]

Cisco material states only 13 dBi antennas can be used on the AXP model. Can someone give me a reason why they cannot be used on the AXE model?

[Leo Laohoo]

AXP is a specially designed AP and antenna for wide open spaces like stadium or arena. 

[littleyoda]

What is the technical reason? This is what I'm looking for.

[Leo Laohoo]

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@littleyoda wrote:

What is the technical reason? This is what I'm looking for.

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The technical reason is LAW.  

Data sheet explicitly states: 

Cisco Catalyst 9120AXP Access Points) are certified for use with antenna gains up to 13 dBi

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The AXP have different/higher Tx power vs AXE.  This is because it is by mandated by law and drawn up the US FCC.

[littleyoda]

Sorry I missed this. So while I understand FCC regulation is not to exceed 36dBm EIRP, even with a 13dBi gain on 20dBm power, that still comes under with the 9210axe. So I see no reason why a 13dBi cannot be used with an AXE if in fact it uses lower transmit power then the AXP.

[Arshad Safrulla]

P AP's have a lower power output compared to E AP's. This helps to stay within FCC or any regulatory limits when you connect stadium antennas, this doesn't mean that stadium antenna will not work with E AP, it will work but you will end up violating FCC or any regulatory limits set.

[littleyoda]

But the FCC EIRP is 36. Max transmit power is 23dBm + 13dbi. That's 36. How will the E model ever go over FCC regulation?

[Arshad Safrulla]

I am not much aware of FCC rules as it's not the regulatory domain I follow. But where does it say for all the channels it is 36dB? 

https://apps.fcc.gov/kdb/GetAttachment.html?id=1K3EcgPRatUcWMwkA%2BuROw%3D%3D&desc=905462%20D06%20802%2011%20Channel%20Plans%20%20New%20Rules%20v02&tracking_number=27155