Powered Device Classes; Power Budget; Port Prioritization; Table 10: Ieee Powered Device Classes - Allied Telesis x530L Series Installation Manual

Powered Device
Classes

Power Budget

Port
Prioritization
Powered devices are grouped into the five classes listed in Table 10. The
classes are based on the amount of power the devices require. The switch
supports all five classes.
Table 10. IEEE Powered Device Classes
Maximum Power Output
Class
0
1
2
3
4
The AT-x530L-28GPX and AT-x530L-52GPX 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 24/48 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.
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.
x530L Series Installation Guide for Stand-alone Switches
from a Switch Port
15.4W
4.0W
7.0W
15.4W
30.0W
PD Power Range
0.44W to 13.0W
0.44W to 3.84W
3.84W to 6.49W
6.49W to 13.0W
13.0W to 25.5W
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