1252 APs with 802.3af Power

[Marvin Krym]

I am running 1252 APs with 802.3af power and HT/11n disabled so it seems to work OK.  However, when I configure minumum RF power to 2 dBm in the RRM settings, the radio should be set to RF Power Level 7 by RRM.  It is actually set to Power Level 8.

In another deployment where 1252 APs are PoE powered with proper 20W and min RF power is configured to 2 dBm, the radio is set to Power Level 7 by RRM as expected.

Is it possible that using 15W .af PoE power instead of 20W causes the AP to reduce RF power?

Thanks.         

[Scott Fella]

With 802.af, you don't have enough power to power both radios so the power is reduced in order to be able to power the ap and both radios. If you removed one radio, then you would have max power available to that radio.

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[Scott Fella]

Per a doc

Powering the Aironet 1250 Series Access Point with 802.3af Power over Ethernet
The Aironet 1250 Series Access Point with one RM1252 radio module installed requires 12.95W, which is within the 802.3af Power over Ethernet (PoE) standard. Any Cisco switch supporting 802.3af may be used to power the Aironet 1250 Series Access Point with one RM1252 radio module installed. This is ideal for businesses that chose to only deploy on a single frequency (2.4 GHz or 5 GHz). A single radio provides optimum performance with approximately 300 Mbps maximum PHY data rate. Customers who deploy dual-band, 802.11n radios and power the 1250 Series using standard 802.3af will have more reliable and predictable coverage than that provided by traditional 802.11a/g networks; however, operation will be limited to a single transmitter per radio with maximum PHY data rates of 150 Mbps instead of 300 Mbps per radio. Customers with a significant investment in 802.11 a/b/g client devices that have low-to-medium bandwidth needs but high-reliability requirements will benefit the most from this type of deployment scenario.


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