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Aruba 2530 not enough PoE

Hey! First time posting here and didn't quite know where to open my topic.

 

Anyways here is my problem

 

I set up a few AP305 in a school.

My Aruba 2530 8G PoE has a PoE capacity of 67W.

Aruba AP305 power consumption is 13W worst case scenario.

If my math adds up it should supply 5 AP305 in worst case scenario and yet it supplies only 3 or maybe 4 if I am lucky.

 

Am I missing something? It's messing with my planning and making it kinda akward to explain my customer that he needs to upgrade to a bigger switch.

All these informations have been taken from arubanetworks.com

 

Thanks in advance!

 

Sincerely Kevin

 

Aruba Employee

Re: Aruba 2530 not enough PoE

What is the POE budget that the 2530 is reserving for each AP305? I suspect that the 2530 is reserving 15.4W of POE per port (class 3), of which each AP305 will pull a max of 13W (assuming no USB powered devices are used on the 305s). If the switch is reserving a full 15.4W, then the math works out that 4 APs would be supported, assuming no other POE devices on the switch.

 


Charlie Clemmer
Aruba Customer Engineering
New Contributor

Re: Aruba 2530 not enough PoE

I didn't know it would reserve up up too 15.4W of POE per port.

Is it possible to turn it down so it can support one more unit?

 

But it makes sense that way! Thanks!

Aruba Employee

Re: Aruba 2530 not enough PoE


@sysKevinHein wrote:

I didn't know it would reserve up up too 15.4W of POE per port.

Is it possible to turn it down so it can support one more unit?

 

But it makes sense that way! Thanks!


It has to do with how POE needs are signalled (via the standards: 802.3af, 802.3at, and the power class of the device) ... and that the length of cable will attenuate the actual power delivered to the device over distance. 


Charlie Clemmer
Aruba Customer Engineering
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