Allied-telesis AT 8000/8POE User Manual download pdf (Page 105)

AT-S81 Management Software User’s Guide

Section I: Using the Menus Interface 105

Port

Prioritization for

Power Allocation

The AT-S81 management software also allows you to prioritize the ports in

the event that the powered devices require more power than the switch

can deliver. This feature ensures that the most important powered devices

connected to the switch are guaranteed to have power.

If the powered devices connected to the switch require more power than

the switch is capable of delivering, the switch denies power to some ports

based on a system called port prioritization. You can use this system to

ensure that powered devices that are critical to your network are given

preferential access to the available power.

There are three priority levels:

 Critical

 High

 Low

Ports designated as critical receive power before any other ports with a

lower priority. Always assign the critical priority level to your most

important network devices. If there is not enough power to support all the

ports set to the critical priority level, then power is provided to the ports

based on port number, in ascending order.

Ports set to the high level receive power only after all the critical ports

receive their power. If there is not enough power to support all the ports

set to the high priority level, then power is provided to the ports based on

port number, in ascending order.

The lowest priority setting is low, the default setting for all ports. Ports with

low priority receive power only after the critical and high level ports receive

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

high priority level, then power is provided to the ports based on port

number, in ascending order.

PoE Device

Classes

The IEEE 802.3af standard specifies four classes for powered devices

based on their power usage. The classes are defined in Table 2.

Table 2. Power Classes for Powered Devices

Class Power Usage

0 (Default) 0.44 W to 12.95 W

1 0.44 W to 3.84 W

2 3.84 W to 6.49 W

3 6.49 W to 12.95 W

1 2 ... 100 101 102 103 104 105 106 107 108 109 110 ... 359 360

No comments

Allied-telesis AT 8000/8POE User Manual Page 105