Extracting voltage from PoE without a data connection active

GeX

GeX

GeX

Soldato
Joined
17 Dec 2002
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Location
Manchester
I have a Netgear GS116PP, which is unmanaged 16 port PoE switch (802.3at). I have a redundant cable run that used to carry my phone line for FTTC. The phone line is gone now I have FTTP and I've put a network socket on one end and wired it into my patch panel at the other (I installed this cable, it's cat5e).

I want to use this cable to power my Nest thermostat so that I can eliminate a wall wart in the hallway. I want to use the PoE switch as it's there, will deal with voltage drop and other issues.
I have a TP Link PoE splitter (TL-PoE10R) that has Ethernet/PoE in, DC out and Ethernet out. I connected this up and it doesn't work. It pulses, and my switch shows it's a fault.

Having looked more into it it seems I need to connect a device to the Ethernet out too. I don't have anything I can connect at that location.

As it's an unmanaged switch, I can't tell the switch to just enable PoE.

I'm wondering if there is any other way to switch on 'phantom power'? I have some Ubiquiti PoE injectors, and a Ubiquiti EdgeMax 12P router which has passive 24V PoE - but I don't know if that's enough.

I know I could just get a non-PoE injector and use that, but then I need to mess about ensuring the voltage doesn't drop too much on the cable run.
 
Ubiquiti have the INS-3AF-USB which gives you a USB port and doesn’t have any data connection at all so can’t fail to work without it connected.
 
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