On a S2700/S3700/S5700 switch, a PoE power supply unit and a common power supply unit differ in their appearance and functions.
Figure 1, Figure 2, and Figure 3 show their appearance. A PoE power supply unit has a fan, but a common power supply unit does not.
Figure 1 Common power supply unit
Figure 2 250 W PoE power supply unit
Figure 3 500 W PoE power supply unit
A PoE power supply unit can provide power for both the entire device and the PDs, whereas a common power supply unit can provide power for only the entire device.
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