What is resistive power discovery, and how does it work?
What will be an ideal response?
The discovery process called resistive power discovery basically looks for devices that support PoE. Valid PDs have a 25k? resistor connected between the transmit and receive pairs. Before full power is delivered to the PD, two low-voltage “discovery” signals are sent out to verify that a compatible PoE device is attached. The second of the two signals is a slightly higher voltage than the first, but neither is large enough to damage an incompatible device. If the PSE detects a compatible PD, the full 48 volts is applied to all ports that have compatible PDs connected.
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