Power Over Ethernet (PoE) Operation
Introduction to PoE
Introduction to PoE
PoE technology allows IP telephones, wireless LAN access points, and other
appliances to receive power and transfer data over existing ethernet LAN
cabling. For more information about PoE technology, refer to the PoE Plan-
ning and Implementation Guide, which is available on the ProCurve Net-
working web site at www.procurve.com. (Click on technical support, then
Product manuals (all)).
PoE Terminology
Term Use in this Manual
active PoE port A PoE-enabled port connected to a PD requesting power.
priority class Refers to the type of power prioritization that uses Low (the default), High,
and Critical priority assignments to determine which groups of ports will
receive power. Note that power priority rules apply only if PoE provisioning
becomes oversubscribed.
MPS Maintenance Power Signature; the signal a PD sends to the switch to
indicate that the PD is connected and requires power. Refer to Figure 11-4
on page 11-22.
Over-Subscribe The state where there are more PDs requesting PoE power than can be
accommodated.
PD Powered Device. This is an IEEE 802.3af-compliant device that receives its
power through a direct connection to a Gig-T PoE port in a PoE device.
Examples of PDs include Voice-over-IP (VoIP) telephones, wireless access
points, and remote video cameras.
port-number Refers to the type of power prioritization where, within a priority class, a
priority PoE module assigns the highest priority to the lowest-numbered port in the
module, the second-highest priority to the second lowest-numbered port in
the module, and so-on. Note that power priority rules apply only if PoE
provisioning on the module becomes oversubscribed.
PoE Power-Over-Ethernet; the method by which PDs receive power from a PoE
module (in compliance with the IEEE 802.3AF standard). Some pre-standard
PoE devices are also supported; refer to the FAQs for your switch model.
PSE Power-Sourcing Equipment. A PSE, such as a J8702A PoE module installed
in a ProCurve 8212zl switch, provides power to IEEE 802.3AF-compliant PDs
directly connected to the ports on the module. The PoE module is an
endpoint PSE.
PoE Module Refers to a PoE Module (J8702A) for the 8200zl switches.
11-4
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