HP Power over Ethernet (PoE/PoE+) Planning and Implementation Guide

2-5

Operating Rules

Provisioning Power for PoE

Many of the PoE/PoE+ switches discussed in this manual support an external

power supply (EPS) that can provide either redundant or extra PoE/PoE+

power. It is important to understand how PoE power is provisioned in order

to use these EPSs efficiently. The following chapters will discuss this in detail

for each of the products.

By connecting an EPS you can optionally provision more PoE wattage per

port and or supply the switch with redundant 12V power to operate should an

internal power supply fail.

For example, by installing a second power supply in the 5406zl/8206zl or a

third power supply in a 5412zl/8212zl chassis, depending on how many PoE

ports are being supplied with power, the switch can have redundant power if

one power supply fails. A Power Supply Shelf (external power supply) can

also be connected to the 5400zl/8200zl switches to provide extra or redundant

PoE power.

For example, if the 5406zl has two 24-port PoE modules (J8702A) installed,

and all ports are using 15.4 watts, then the total wattage used is 739.2 watts

(48 x 15.4). To supply the necessary PoE wattage a J8713A power supply is

installed in one of the power supply slots.

To gain redundant power, a second J8713A must be installed in the second

power supply slot. If the first power supply fails, then the second power supply

can supply all necessary power.

For information on provisioning PoE power by your switch, see the chapter

in this manual for your switch model.