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Powered Device
Classes
Power Budget
Port
Prioritization
Powered devices are grouped into the five classes listed in Table 7. The
classes are based on the amount of power the devices require. The switch
supports all five classes.
Table 7. IEEE Powered Device Classes
Maximum Power Output
Class
0
15.4W
1
4.0W
2
7.0W
3
15.4W
4
30.0W
The AT-x530-28GPXm switch has 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 PoE+
twisted pair ports. Under normal operating conditions, the power budget
enables the switch to support 24 Class 4 devices with the maximum
25.5W on all PoE+ ports, simultaneously. However, if one of the two power
supplies fails or is powered off the power budget decreases by half from
740W to 370W.
If the power requirements of the powered devices exceed the switch
power budget, the switch denies power to some ports based on a system
called port prioritization. Use this mechanism in the distribution of power if
the demands of the devices exceed the available capacity. This ensures
that powered devices critical to the operation of your network are given
preferential treatment by the switch.
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 must 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.
x530 Series Installation Guide for Stand-alone Switches
from a Switch Port
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
29
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