Poe Terminology - HP ProCurve 6400cl Series Management And Configuration Manual

Power Over Ethernet (PoE) Operation for the Series 5300xl Switches

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 where an xl PoE module uses Low
(the default), High, and Critical priority assignments to determine which
groups of ports will receive power. Note that power priority rules apply on
a per-module basis, and only if PoE provisioning on a given module becomes
oversubscribed.
EPS External Power Supply; for example, an HP 600 ProCurve RPS/EPS or an HP
ProCurve 610 EPS. An EPS device provides power to provision PoE ports on
a module. See also "RPS", below.
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 11-11-
4 on page 11-18.
Over-Subscribe The state of a J8161A xl PoE module where there are more PDs requesting
PoE power than the module has power to accommodate.
PD Powered Device. This is an IEEE 802.3af-compliant device that receives its
power through a direct connection to a 10/100Base-TX PoE RJ-45 port in an
xl PoE module. 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, an
priority xl 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 an xl
PoE module (in compliance with the IEEE 802.3af standard).
PSE Power-Sourcing Equipment. A PSE, such as a J8161A xl PoE module
installed in a Series 5300xl switch, provides power to IEEE 802.3af-compliant
PDs directly connected to the ports on the module. The xl PoE module is an
endpoint PSE.
RPS Redundant Power Supply; for example, the non-EPS operation of an HP 600
RPS/EPS. An RPS device provides power to a switch if the switch's internal
power supply fails. RPS power does not provision PoE ports in modules
installed in the 5300xl switches. See also "EPS", above.
RPS/EPS A device that delivers redundant power to run a switch and external power
to support PoE operation on a switch.
xl PoE Module Refers to an HP ProCurve Switch xl PoE Module (J8161A).
Introduction
11-3