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Powered Device
Classes
Table 6 shows PoE specifications for each model.
PoE+ Switch
Model
AT-FS980M/9PS
AT-FS980M/18PS
AT-FS980M/28PS
AT-FS980M/28DP
AT-FS980M/52PS
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 powered devices is less than the power budget
of the switch, the switch can supply power to all of the devices. 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 of 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.
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.
Powered devices are grouped into the five classes listed in Table 7 on
page 34. The classes are based on the amount of power the devices
require. The switches support all five classes.
FS980M Series Fast Ehternet Managed Switches Installation Guide
Table 6. PoE+ Switches
Powered
Power
Device
Budget
Classes
150 watts
0 to 4
250 watts
0 to 4
375 watts
0 to 4
Number of
Number of
PoE Ports
PoE+ Ports
8
5
16
8
24
12
33
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