Passive PoE injector
Passive PoE injector · DC in by jack or screw terminals (passes the input voltage) · + on pins 4/5, − on pins 7/8 · 2 A

Try it on the benchThe lab drops it on an empty bench and opens its datasheet card.
Pins
- DC jack centre (+)
- DC jack sleeve (−)
- V+ (screw)
- V− (screw)
- LAN (data in)
- PoE (power + data out)