With the end-of-cable splitter, it's possible they'd work, because it would look like ethernet + barrel connector power, however I have had trouble when the ethernet cable only supports two pairs for data (because the other two pairs are used to transmit the power) but both ends think they are gigabit. Not a problem for Raspberry Pi's (at least not until the rpi4), but I've had problems with the MR24s with less than gigabit-capable (all 4 pairs available for data) PoE injectors. The ones I linked are cheap enough (and cute!) that they've been worth it.
On Mon, Nov 18, 2019 at 10:08 PM Russell Senior <[email protected]> wrote: > My experience trying to power the MR24 with "passive PoE" and/or less than > 48V were not successful. You really need a standards compliant PoE > injector for them. > > Apparently there is/was a patent on the chips that do/did the IEEE PoE > standard, which made them too expensive (I recall something like $15/chip) > for commodity grade hardware and so price-sensitive vendors like Ubiquiti > basically said "F-you" and used lower (12-24V) voltage PoE instead. Meraki > isn't price sensitive hardware. > > On Mon, Nov 18, 2019 at 9:01 PM Erik Lane <[email protected]> wrote: > >> If this will do it, it would be a cheap and easy fix. >> >> https://www.amazon.com/BeElion-Passive-Injector-Splitter-Connector/dp/B01HMNJHII/ >> >> I've been planning something similar to run a raspberry pi in a location >> away from a power outlet. Since I don't need hardly any power, the 12V >> will >> be just fine even with a long ethernet cord. (Though I'm not going to be >> all that long, really, just 20ft or so.) >> >> It sounds like your use case might be simple enough that something like >> this would do the trick. (In case it's not clear, one of these goes on >> each >> end of the ethernet cable, and then you plug the power pack into the >> female >> end and plug the male end into your device, and you're golden.) >> >> Good luck, >> Erik >> >> >> On Mon, Nov 18, 2019 at 6:14 PM Rich Shepard <[email protected]> >> wrote: >> >> > On Mon, 18 Nov 2019, Russell Senior wrote: >> > >> > > If you can easily reach the MR24 with a regular ac adapter (12V DC >> > > output), then the PoE isn't really buying you anything. If you want to >> > put >> > > the MR24 somewhere that is hard to plug into power directly (you have >> to >> > > run ethernet to it anyway), that's where PoE becomes worthwhile. >> > >> > Russell, >> > >> > It's on the wall about 6' above the floor. The electrical cord is about >> > that >> > long and would need to be longe to reach an outlet. >> > >> > Thanks for the insights and lesson. >> > >> > Regards, >> > >> > Rich >> > >> > >> > _______________________________________________ >> > PLUG mailing list >> > [email protected] >> > http://lists.pdxlinux.org/mailman/listinfo/plug >> > >> _______________________________________________ >> PLUG mailing list >> [email protected] >> http://lists.pdxlinux.org/mailman/listinfo/plug >> > _______________________________________________ PLUG mailing list [email protected] http://lists.pdxlinux.org/mailman/listinfo/plug
