In PoE, what determines how much power a port can deliver to a device?

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In PoE, what determines how much power a port can deliver to a device?

The amount of power a PoE port can deliver is set by the negotiation between the powered device and the power sourcing equipment, combined with what the PSE is capable of providing. The powered device declares how much power it needs by presenting a PoE class or type during the handshake, and the PSE responds with the per-port limit it can supply. The actual power delivered is the smaller of the two: what the device requests and what the PSE can safely deliver, taking into account any per-port budget. Cable length and category influence voltage drop and maximum practical power in real installations, but they don’t determine the device’s power draw. The color of the RJ45 connector has no bearing on PoE power.

The amount of power a PoE port can deliver is set by the negotiation between the powered device and the power sourcing equipment, combined with what the PSE is capable of providing. The powered device declares how much power it needs by presenting a PoE class or type during the handshake, and the PSE responds with the per-port limit it can supply. The actual power delivered is the smaller of the two: what the device requests and what the PSE can safely deliver, taking into account any per-port budget. Cable length and category influence voltage drop and maximum practical power in real installations, but they don’t determine the device’s power draw. The color of the RJ45 connector has no bearing on PoE power.

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