Is it possible to use Active PoE splitter that does comply to 802.3af, with passive PoE injector?
- 802.3af does autonegotiate
- Does negotiation take passive PoE into account?
Acording to: This answer @ networkengineering
Polarity is required on data pairs, and ambiguously implemented for spare pairs, with the use of a diode bridge.
That would mean, unless the negotiation does not allow fallback to spare pairs, or let's the DC pass through (dangerous?), or just does not operate at all (would be useless), it should work.
Note: The device also has to power itself before it can do anything, which means it has to by default tap into both possible powersources internally. Even if that is a low current path.
According to: Fundamentals of Power Over Ethernet, page 5, flowchart.
- Negotiation is managed/initated by injector
- The splitter does provide a signature
Which does imply, given the standard (previous quote), it should automatically inteligently use the power on the spare lines.