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Sorry for necroing this thread, but I found a solution for my situation and thought it would be useful for other people that are searching for a similiar solution.
After some googling I found a PoE splitter that does the trick and is not extraordinary expensive .
The splitter actually converts the 48V DC supplied by the PoE switch to 9V DC. The output seems to use the same jack that the Netduino has which would make it a perfect fit.
I am planning to test this setup next week and post the results here so you guys know if this works out of the box.
A while ago I bought the original Netduino. I'm planning on doing a domotics project and wanted to buy an Arduino Ethernet Shield with the Ag9120-S PoE (Power over Ethernet) module.
After searching around a bit I stumbled upon a topic (http://forums.netdui...hernet-shields/) which states that DHCP is not supported on this shield. So now I'm planning on buying a Netduino Plus 2 instead which has ethernet supported natively.
However, the Netduino Plus 2 doesn't support PoE and it isn't possible to use a PoE module either. I know there are a few homebrew solutions out there but I already got an IEEE802.3af compliant PoE switch which I want to use. Are there any plans on supporting the Ag9120-S (or similiar) module in the future? Becuase in that case I'm just going to wait for a new Netduino Plus design (still got a year or so before I start with this project).
PoE, done according to spec, adds quite a bit of cost and would add a lot of big parts to Netduino Plus 2. We investigated it, but the board would have been close to $100.
I'd recommend using a PoE splitter for now (to provide Ethernet to the Ethernet jack, and power to the DC power barrel). If there's a lot of interest, we could also do a Netduino Plus "PoE" sometime in the future...although I hate to fragment things too much.
BTW, it is possible to build a PoE shield for the regular Netduino. If anyone in the community is interested in building one, drop me a line...we can provide all the software you'd need including a native networking stack.
I understand that adding all the parts according to the spec would increase the cost and required space. However, by adding only the pin holes for the Ag9120-S module (http://www.amazon.co...d/dp/B005K0IIKE) the PoE support would become optional just like it's done for Arduino Ethernet and Arduino Ethernet Shield. Or does that imply other major changes as well? For now I'll just use a splitter like you suggested.
Your suggestion for creating a PoE shield is a very interesting idea though, I might consider building one in a few months. Gotta study the hardware schematics and stuff first though,I as I didn't look at the Netduino in that much detail yet. I'll let you know if I worked it out a bit more and need the networking software.
It would also be possible to cut a short CAT5e cable, put RJ45 plugs on both ends accordingly, but leave out the power wires.
At http://en.wikipedia....r_over_Ethernet you can find details about the power levels. Appairently it's input is 37.0–57.0V when supporting both 802.3at Type 1 and type 2.
So, then you need a way to convert that voltage range to ~9V and feed that to the Vin pin.
Unfortunately that isn't possible in my case. I'm using a D-Link DGS-1210-10P Switch (http://www.dlink.com...combo-sfp-slots) which is compliant to the IEEE 802.3af standard. That means that the device has to negotiate with the switch on how much power is provided over the ethernet cable.
The switch won't provide any power if nothing is requested, so I need something that does this for the Netduino instead. I already found a D-Link DWL-P50 PoE splitter(http://www.dlink.com...hernet-splitter) that should do the trick. It can provide 5V or 12V DC, so it's perfect .
it is not PoE standard compliant because of "Ports 2-5 can power other PoE capable devices with the same voltage as applied to the unit.". So you can power routerboard with 12V and pass this voltage to Netduino and power it using cable splitter at the end.
This one, and the ethernet shield, have place for an PoE module you can attach later, that module is kinda expensive, but shouldn't add that much cost for supporting it?
Sorry for necroing this thread, but I found a solution for my situation and thought it would be useful for other people that are searching for a similiar solution.
After some googling I found a PoE splitter that does the trick and is not extraordinary expensive .
The splitter actually converts the 48V DC supplied by the PoE switch to 9V DC. The output seems to use the same jack that the Netduino has which would make it a perfect fit.
I am planning to test this setup next week and post the results here so you guys know if this works out of the box.
After researching POE options for my Netduino projects I went in a different direction. You can see in the photos I attached, that I'm using a Passive PoE Injector/Splitter. Right now I have one Netduino plugged into a gigabit Ethernet switch and the normal 9v power supply, it works great. Since the Netduino only has 10Mb Ethernet there is no need for the more complex 1Gb PoE. When I add more Netduino devices in the future I'm going to buy a 9v 4A power supply and use a 4-way splitter to send that power to 4 of these PoE splitter pairs.
The splitter on the left plugs into the switch and a power supply the Ethernet plugs into the socket. Then on the right the splitter plugs into the Ethernet and power connectors of the Netduino and the Ethernet cable plugs in the socket. Simple, cheap ($6), and easy to install.
I designed and built a POE shield for my Plus 2 over the Christmas break. It works well and uses an 802.3at & af compliant modular connector.
The minimum PCB prototyping run was 5 boards so I assembled all 5 and just listed the 4 spare ones on eBay at cost (AUD$80.25), if anyone is interested. They are a bit more expensive than the TP Link solution because of the low volume run, but are an integrated Shield solution for the Plus 2.
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