Two power supply methods for poe injector:
The POE standard defines two methods for transmission of DC power to POE compliant devices using Ethernet transmission cables:
1, intermediate cross connect method. Using an independent PoE injector device, a cross connected between the outdoor poe switch and the terminal device with PoE function, is generally used in the Ethernet cable is not used in the idle line to transfer DC power.
2, the end of the cross connection method. The power supply equipment is integrated in the outlet of the signal in the switch, which generally provides the free line and the data line to the "dual" power supply function.