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'''
Key Points:'''
*'''PoE''' (IEEE 802.3af): Provides up to 15.4 W of DC power.
*'''PoE+''' (IEEE 802.3at): Provides up to 30 W of DC power.
*'''PoE++''' (IEEE 802.3bt): Extends the power up to 60 W (Type 3) and up to 90 W (Type 4).
Each class within these standards specifies the maximum power that can be delivered to a powered device (PD), and the maximum power that can be drawn from the power sourcing equipment (PSE), ensuring compatibility and efficient power management across various devices and applications.