HP 5300 Informacje Techniczne Pobierz pdf (Strona 191)

Power Over Ethernet (PoE) Operation

Introduction

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 RPS/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 accomodate.

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).

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HP 5300 Informacje Techniczne Strona 191