This is about the PoE pins on Nvidia Jetson Xavier NX dev kit board for powering the device via PoE.
As per spec guide, " A 4-pin Power over Ethernet (PoE) header (J19 – 1x4 male, 2.54 mm pitch) brings out the VC power pins of the Ethernet connector. In addition, a 2-pin Backpower header (J18 – 1x2 male, 2.54 mm pitch) provides an alternate path for the input voltage (3A max). In order to use this alternate PoE power mechanism, the design will require a power converter to take the high voltage PoE supply (38V-60V) and convert it to the 9V-20V input the carrier board requires."
Does that mean no ground connection is required? Also, are all 4 PoE supply pins identical then?