hi,
An old thread but i was looking to find the same answer.
The cost increase in parts is minimal to make POE IN on all 4 pairs, this would make things a lot better for customers who have hardware capable of feeding 4 pairs of power. Ideally a version of the passive injector that supports 4 pair would be great too.
in response to "there's no routerboard supporting this neither for PoE-IN nor PoE-Out..."
The original RB260GSP had the footprint for the bias transformer and diode to make it 4 pair POE IN, i know as i fitted that transformer and diode for a site where i needed to power some power hungry kit on the end of 30 meters+ of cat5e. It worked wonderfully.
When the newer RB260GSP's came out that ability had been removed, a retro step
I think some of the earlier RB450's also had 4 pair POE in, fed to a bridge rectifier.
What this means is now we and others need to use products like Netonix for 4 pair PoE switches, so that exclusion of a diode and transformer for the two other pairs is proving more costly and less of a saving to Mikrotik in reality.
Bill