Power over Ethernet
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Power over Ethernet overview...................................................................................... 339
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Enabling and disabling Power over Ethernet................................................................ 351
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Disabling support for PoE legacy power-consuming devices....................................... 352
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Enabling the detection of PoE power requirements advertised through CDP...............353
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Setting the maximum power level for a PoE power-consuming device........................ 354
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Setting the power class for a PoE power-consuming device........................................ 355
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Setting the power budget for a PoE interface module on an FSX device..................... 356
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Setting the inline power priority for a PoE port .............................................................357
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Resetting PoE parameters............................................................................................ 358
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Displaying Power over Ethernet information................................................................. 359
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Inline power on PoE LAG ports.....................................................................................371
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Decouple PoE and datalink operations on PoE ports................................................... 373
Power over Ethernet overview
This section provides an overview of the requirements for delivering power over the LAN as defined by
the Institute of Electrical and Electronics Engineers Inc. (IEEE) in specifications 802.3af (PoE) and
802.3at (PoE+ and High PoE).
Brocade PoE devices provide Power over Ethernet, compliant with the standards described in the IEEE
802.3af specification for delivering inline power. Brocade devices are compliant with both the 802.3af
and 802.3at specifications. The 802.3af specification defined the original standard for delivering power
over existing network cabling infrastructure, enabling multicast-enabled full streaming audio and video
applications for converged services, such as Voice over IP (VoIP), Wireless Local Area Access (WLAN)
points, IP surveillance cameras, and other IP technology devices. The 802.3at specification expands
the standards to support higher power levels for more demanding powered devices, such as video IP
phones, pan-tilt-zoom cameras, and high-power outdoor antennas for wireless access points. Except
where noted, this document uses the term PoE to refer to PoE, PoE+, and High PoE.
For a list of the FastIron devices and modules that support PoE, PoE+, High PoE, Power over HDBaseT
(PoH), or a combination, refer to the
FastIron Ethernet Switch Feature and Standards Support Matrix
.
PoE technology eliminates the need for an electrical outlet and dedicated UPS near IP powered
devices. With power-sourcing equipment such as a BrocadeFastIron PoE device, power is consolidated
and centralized in wiring closets, improving the reliability and resilience of the network.
Power over Ethernet terms used in this chapter
The following terms are introduced in this chapter:
•
High PoE
- Covered by IEEE 802.3at 2009, provides up to 60 Watts of power.
•
IP powered device (PD)
or
power-consuming device
- The Ethernet device that requires power. It
is situated on the end of the cable opposite the power-sourcing equipment.
•
PoE+
- Covered by IEEE 802.at, provides up to 25.5 Watts of power.
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