x530 Series Installation Guide for Stand-alone Switches
35
Powered Device
Classes
Powered devices are grouped into the five classes listed in Table 11. The
classes are based on the amount of power the devices require. The switch
supports all five classes.
Power Budget
The AT-x530-28GPXm and AT-x530-52GPXm switches have two power
supplies. Each power supply provides 370W for a total PoE of 740W. This
is the total maximum amount of power that the switch can supply to
powered devices on the PoE+ twisted pair ports. The number of powered
devices that the switches can support at one time will depend on their
power requirements. For instance, under normal operating conditions, the
switches can support up to 12 Class 4 powered devices with the maximum
25.5W.
Port
Prioritization
The power requirements of the PoE devices determine the maximum
number of devices the switch can support at one time. So long as the total
power requirements of the power devices is less than the power budget of
the switch, the switch can supply power to all the devices. But if the total
power requirements exceed the power budget, the switch denies power to
one or more ports using a mechanism referred to as port prioritization.
To determine whether the power requirements of the PoE devices you
plan to connect to the switch exceed its power budget, refer to their
documentation for their power requirements and add the requirements
together. The switch should be able to power all the devices
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.
There are three priority levels:
Critical
High
Low
Table 11. IEEE Powered Device Classes
Class
Maximum Power Output
from a Switch Port
PD Power Range
0
15.4W
0.44W to 13.0W
1
4.0W
0.44W to 3.84W
2
7.0W
3.84W to 6.49W
3
15.4W
6.49W to 13.0W
4
30.0W
13.0W to 25.5W
Summary of Contents for AlliedWare Plus AT-x530 Series
Page 10: ...Tables 10...
Page 14: ...Preface 14...
Page 58: ...Chapter 3 Installing the Switch on a Table 58...
Page 90: ...Chapter 6 Powering On the Switch 90...