Terminal power supply refers to the PSE device (Switch/Hub) with POE power supply function directly supplying power to the PD device (IP phone/network camera) through the network cable. In the POE standard, there are two power supply modes, Alternative A and Alternative B, depending on the power supply pair.
Alternative A mode
Alternative A mode: The PSE device utilizes two pairs of data cables 1, 2, 3, and 6 for power supply.