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Cisco IOS Software Configuration Guide for Cisco Aironet Access Points
OL-30644-01
Chapter 4 Configuring the Access Point for the First Time
Support for 802.11ac
Off channel scanning or transmissions are not supported. The 802.11ac radio depends on 802.11n radios
for the off channel scanning functionality.
For example, to configure 80 Mhz channel width:
ap# configure terminal
ap(config)# interface dot11Radio 1
ap(config-if)# channel width 80
ap(config-if)# end
Power Management for 802.11ac
The 3700, 2700, and 1700 802.11ac series access points can be powered by a Power-over-Ethernet (PoE)
sources, local power, or a power injector. If the AP is powered by PoE, based on the whether the source
is PoE+ (802.3at) or PoE (802.3af), the AP will adjust certain radio configurations as it may require more
power than provided by the inline power source.
For example, a 3700 series AP which is powered by PoE+ (802.3at) will provide 4x4:3 configuration on
both radios, and when powered by PoE (802.3af) it will provide a 3x3:3 configuration on both radios.
Please refer to the below table.
Tip Radio configurations such as 4x4:3 imply 4 transmitters and 4 receivers capable of 3 spatial streams
Note To determine whether the AP is running at high PoE power or reduced (15.4W) power, in the AP's GUI,
got to the Home page. If the AP is running on reduced power, under Home:Summary Status, the
following warning is displayed:
Due to insufficient inline power. Upgrade inline power source or install power injector.
All access points except outdoor mesh products can be powered over Ethernet. Access points with two
radios powered over Ethernet are fully functional and support all the features. See Table 4-5 for the
various power management options available.
Table 4-5 Inline Power Options based on Power Sources
Power Draw Description AP Functionality PoE
Budget
(Watts)
1
1. This is the power required at the PSE, which is either a switch or an injector.
802.3af E-PoE 802.3at
PoE+
PWRINJ4
PoE +
802.3at
AP3700
Out of the box
4x4:3 on 2.4/5 GHz 16.1 No Yes Yes
PoE
802.3af
AP3700
Out of the box
3x3:3 on 2.4/5 GHz 15.4 Yes N/A N/A
PoE
802.3at
AP2700
Out of the Box
3x4:3 on 2.4/5 GHz and Auxillary
Ethernet Port Enabled
16.8NoNoYes
PoE
802.3af
AP2700
Out of the Box
3x4:3 on 5 GHz and 2x2:2 on 2.4 GHz
and Auxiliary Ethernet Port Enabled
15.4 Yes Yes N/A