Allied Telesis AT-x510-52GTX Installationsanleitung PDF herunterladen (Seite 28)

Chapter 1: Overview

simultaneously as long as the total is below its power budget. If the total

exceeds the available power budget, you should consider reducing the

number of PoE devices so that all of the devices receive power.

Otherwise, the switch powers a subset of the devices, based on port

prioritization.

The switch can handle different power requirements on different ports.

This enables you to connect different classes of PoE equipment to the

ports on the switch.

Port

Prioritization

If the power requirements of the powered devices exceed the switch’s

power budget, the switch denies power to some ports based on a system

called port prioritization. You may use this mechanism to ensure that

powered devices critical to the operations of your network are given

preferential treatment by the switch in the distribution of power should the

demands of the devices exceed the available capacity.

There are three priority levels:

 Critical

 High

 Low

Ports set to the Critical level, the highest priority level, are guaranteed

power before any of the ports assigned to the other two priority levels.

Ports assigned to the other priority levels receive power only if all the

Critical ports are receiving power. Ports that are connected to your most

critical powered devices should be assigned to this level. If there is not

enough power to support all the ports set to the Critical priority level,

power is provided to the ports based on port number, in ascending order.

The High level is the second highest level. Ports set to this level receive

power only if all the ports set to the Critical level are already receiving

power. If there is not enough power to support all of the ports set to the

High priority level, power is provided to the ports based on port number, in

ascending order.

The lowest priority level is Low. This is the default setting. Ports set to this

level only receive power if all of the ports assigned to the other two levels

are already receiving power. As with the other levels, if there is not enough

power to support all of the ports set to the Low priority level, power is

provided to the ports based on port number, in ascending order.

Power allocation is dynamic. Ports supplying power to powered devices

may cease power transmission if the switch’s power budget is at

maximum usage and new powered devices, connected to ports with

higher priorities, become active.

You can use port prioritization on dual power supply PoE switches to

protect your important networking devices from loss of power should one

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