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1-6

Introduction

Overview

Introduction

Power Redundancy

There are two types of power supplied by the Series 5400zl switch power

supplies:

■ 12V power or system power

■ 50V power or PoE power

The 12V system power is used for the backplane and is what operates the

internal components of the switch. The 50V PoE power is used to power the

PoE devices connected to the modules.

It is important to provide a secondary power supply for redundancy purposes

for both the 12V and 50V circuits. The internal power supply in these switches

provides both the 12V (system) and 50V (PoE) circuits. If the 12V (system)

power fails the switch will shut down. If the 50V (PoE) fails, all PDs would

lose power. Therefore, to keep the switch running should one power supply,

or either power source fail, you should install a second power supply.

The 5406zl chassis can hold two internal power supplies and the 5412zl chassis

can hold four internal power supplies:

■ J8712A, which operates at 100-127 volts and draws 11.5 amps, or 200-240

volts and draws 5.7 amps, and supplies 273 watts of PoE power

■ J8713A, which operates at 200-220 volts and draws 10 amps, and supplies

900 watts of PoE power

Using two J8712As, or two J8713As, or a mix of both is supported (however

mixing power supplies is not recommended) and necessary to ensure the

switch has both 12V (system power) and 50V (PoE power) should one power

supply fail. See the ProCurve Switch zl Internal Power Supplies Installation

Guide, for more information and specifications on these power supplies.

When considering redundant power, also consider the power source for the

power supplies. Each power supply should be connected to a separate power

source circuit in order to supply complete redundancy. Should one circuit fail,

it would then be possible for the other circuit to continue supplying power to

the second power supply in the switch, keeping the switch running.

There is also an external power supply, the ProCurve Switch zl Power Supply

Shelf (J8714A), that can be connected to either of the 5400zl switches for the

purpose of adding extra or backup 50V (PoE power). The zl Power Supply

Shelf will not supply any 12V (system power) to a 5400zl switch, since the

switch itself already has full redundancy in it’s 12V sources.

HP J8697A Planning And Implementation Guide

Other manuals for HP J8697A