Where is the maximum PoE power of 15.4 W measured?

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Multiple Choice

Where is the maximum PoE power of 15.4 W measured?

The 15.4 W maximum PoE power is defined at the source—the Power Sourcing Equipment (PSE) port. This is the amount the PSE can push onto the Ethernet cable. As the power travels through the cable, resistance causes voltage drop and some power is lost as heat, so the powered device typically ends up receiving about 12.95 W. Measuring at the PD or at the cable midpoint would show lower values, since losses occur along the way. If the device acting as the source is a switch port, it’s still the PSE side, but the official rating is specified at the PSE.

The 15.4 W maximum PoE power is defined at the source—the Power Sourcing Equipment (PSE) port. This is the amount the PSE can push onto the Ethernet cable. As the power travels through the cable, resistance causes voltage drop and some power is lost as heat, so the powered device typically ends up receiving about 12.95 W. Measuring at the PD or at the cable midpoint would show lower values, since losses occur along the way. If the device acting as the source is a switch port, it’s still the PSE side, but the official rating is specified at the PSE.

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