Cisco Aironet 1300 Power Injector - LR2T AIR-PWRINJ-BLR2T= Manuel D’Utilisation

© 2007 Cisco Systems, Inc. All rights reserved.

The goals of this document include the following:

Identify Cisco inline-powered WLAN devices and their usage requirements with a Cisco 
inline-powered switch, mid-span device, or injector-powered solution.

Help identify compatibility to enable the selection of the appropriate powered solution for the 
deployed device.

Identify implementation requirements for all Cisco WLAN products that operate from inline power 
via Cisco pre-standard power, IEEE 802.3af, and the emerging 802.3at standard.

This section describes various types of Power over Ethernet (PoE) including Cisco pre-standard power, 
IEEE 802.3af power, and IEEE 802.3at power.

The first generation of Cisco pre-standard PoE was designed to power devices such as Cisco IP phones 
and access points. This pre-standard solution had relatively low power requirements (approximately 6 to 
7 watts). Later generations of pre-standard power supported higher power modes (up to 15 Watts) and 
added power negotiation via Cisco Discovery Protocol (CDP). In July 2003, the IEEE ratified the 
802.1af standard (up to 15.4 watts of power). With the ratification of IEEE 802.3af, Cisco supports both 
IEEE 802.3af and Cisco pre-standard PoE concurrently. Cisco has also extended pre-standard power 
management using CDP negotiation to Cisco IEEE 802.3af compliant devices to further optimize Power 
Source Equipment (PSE) power management.

When using a Cisco pre-standard source for power, it is important to check the power draw in watts 
(

) and verify that the PSE can supply enough wattage to the powered device. Depending on the 

version of your PSE, enough power may not be available to supply some of the newer access points.