Cisco Aironet 1300 Power Injector - LR2T AIR-PWRINJ-BLR2T= Manual De Usuario
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Cisco Aironet Power over Ethernet
Application Note
Application Note
Introduction
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.
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.
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.
via Cisco pre-standard power, IEEE 802.3af, and the emerging 802.3at standard.
Types of Power over Ethernet
This section describes various types of Power over Ethernet (PoE) including Cisco pre-standard power,
IEEE 802.3af power, and IEEE 802.3at power.
IEEE 802.3af power, and IEEE 802.3at power.
Cisco Pre-Standard 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.
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.