Cisco aironet 2800 series Deployment Manual page 46

If the AP2800 and AP 3800 are powered from an 802.3af power source the LED will cycle though the colors
and the radios will be disabled.
Performance requires power as the AP 2800 and AP 3800 have much more advanced features such as:
1 Dedicated microprocessor and memory for each radio band
2 Dual core processor to manage access point and Ethernet functionality
3 Additional XOR radio and antenna switching circuitry, pushing transceiver count to 12 radios
4 Cisco CleanAir silicon for complete spectrum analysis and interference detection
5 Cisco ClientLink powerful (legacy .11a/g/n and .11ac Wave 1 beamforming)–improving older client
connectivity and performance; IEEE specification is limited to only TxBF on 802.11ac Wave-2 clients
6 Additional (auxiliary) Ethernet port, USB and advanced radio functions such as 160 MHz / Dual XOR
7 Support for smart antenna functionality (WSM monitor mode and enhanced location)
8 802.3bz (NBASE-T) mGig Ethernet support (AP 3800)
9 Future hardware expandability using modular technology (AP 3800)
Understanding different types of PoE powering standards:
• Cisco Pre-standard PoE - Original implementation 6-7 Watts (2000-2001)*
• Cisco Pre-standard PoE - upgraded to negotiate up to 10-15 Watts via CDP (2001-2003)
• IEEE 802.3af PoE mechanism that supplies power up to 15.4W (July 2003)*
• IEEE 802.3at PoE mechanism that supplies up to 30W (2009)*
• UPoE Cisco method of Universal Power over Ethernet that supplies power up to 60W (2014)*
The * indicates these are approximate dates and PoE is defined as the maximum power required at the
Note
source.
Cisco Aironet Series 2800/3800 Access Point Deployment Guide
42
AP 2800 and AP 3800 Powering Options