POE on Aironet 1130ag failes

Unanswered Question
Mar 12th, 2008

Hi, I am trying to enable POE on our three new Aironet 1130ag but they fail to get the power from 6500 switches which have WS-X6348 modules and WS-F6K-VPWR sub modules. I disabled power injector and tried power negotiation and pre-standard compatibility without any success. Thanks.

I have this problem too.
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rob.huffman Wed, 03/12/2008 - 20:12

Hi Reza,

I think you have already figured out the problem here :) This module - WS-F6K-VPWR only supplies 7W of PoE power and the 1130 requires 802.3af 15W PoE;

http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/hardware/Config_Notes/78_10826.html#wp31976

We had this happen to us recently due to a PoE problem. The 1130 requires either IEEE 802.3af power or needs a setting on the WLC for using power injector or Cisco Pre-Standard PoE. Our older switches could only provide Cisco Pre-Standard PoE so we had to tweak the WLC Power setting for these AP's. Once we did that the Radios came right up. Here is a reference;

You may have to enter the following info in the WLC;

While the AP boots, with its Intelligent Power Management feature, it negotiates with the switch via Cisco Discovery Protocol messages in order to provide the necessary power to the AP. Even though the power injector is connected to the AP, the AP that uses this Intelligent Power Management feature gives priority to the Cisco Discovery Protocol information in order to identify whether or not the switch can provide the power. Therefore, after the Cisco Discovery Protocol message shows that the switch does not provide sufficient power (since it is not an inline power capable switch), the AP disables its radios. At this time, the status LED of the AP turns orange and this error message is recorded:

[ERROR] : AP has not enough in-line power

to enable radio slot 1 In order to overcome this problem, issue the

config ap power injector enable installed

command on the controller that is connected with this AP. This command is available from controller version 3.2.116.21. Ensure that you use the correct version in the controller.

This command specifies that a power injector is used in order to supply sufficient power to the AP.

From this doc;

Cisco Aironet and WLAN Controller Product Power Options

http://www.cisco.com/en/US/products/hw/wireless/ps430/products_tech_note09186a00800946e7.sh

Have a look at this good Q&A;

Q. As with the 1200 Series AP, can a 1130/1240 AP work with 7 watts of power to it from a pre-standard POE with 802.11g radio alone disabled?

A. No, the power consumption on the AP1240 breaks down like this:

5 GHz only radio 11.56 watts

2.4 GHz only radio 12.96 watts

Both radios on 15.0 watts

The power consumption on the AP1130 breaks down like this:

5 GHz only radio 9.750 watts

2.4 GHz only radio 9.910 watts

Both radios on 12.20 watts

In either case, you can see that, for the AP to operate with a single radio, it requires more than 7 watts of power.

http://www.cisco.com/en/US/products/hw/wireless/ps430/products_qanda_item09186a00806a4da3.shtml

Hope this helps!

Rob

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