Workflow

This process details how persistent PoE with 2-event enabled and Fast PoE works:

1. The PSE detects the presence of a powered device by applying a small voltage (usually between 2.7V and 10.1V) on the Ethernet cable and measuring the resistance to determine that a powered device is connected.
2. The PSE sends a low voltage (usually between 15.5V and 20.5V) on the Ethernet cable, and the powered device responds with a specific current signature that indicates its power class, for example class 0, 1, 2, 3, or 4 and so on. This is known as the first event.
3. The PSE repeats the classification voltage a second time. This is known as the second event.
4. Based on the power class identification, the PSE applies full operating voltage (44V to 57V, typically around 48V) and begins delivering power to the powered device.