Does anyone know if PoE is possible with a usb ethernet dongle? I
would like to add an network camera to the BeagleBoard.
Thanks,
Willem
Beagle needs 5V. You would have to break out the voltage from a dongle and then run it into the beagle. I doubt you can find a dongle that would support POE as a dongle is a client device expecting voltage to be supplied by the host device and not supplying power to the host device. You could break out the wires befor ethey go into the conenctor and connect them to Beagle. But, it needs to be 5V.
Gerald
If you have a point-to-point network between the beagle and camera, you would need a PoE power injector (midspan PSE) between the Ethernet dongle and the camera. Alternatively, if you use a PoE switch (endspan PSE), you can attach both the BB and the camera to the switch; only the camera will draw power from the switch, obviously.
If you also wanted the BB to be powered by Ethernet, then you need a PoE power extractor to provide power and handle the PoE power negociation; some will provide 5V directly, otherwise you also need a converter.
Marc
Thanks for the replies. I'm now looking at the zippy board and
wondering if its built in ethernet would able to send power to a
network camera?
I don’t thin the Zippy siupports POE. As mentioned, you can cut the power in via an adapter ot just cut the wires out of the cable at the board and connect the power there.
Gerald
I hadn't really read up on the PoE specifications as I only discovered
this method of power supply today. Looks like I need to incorporate a
PoE injector as Mark pointed out. Cheers
I hadn't really read up on the PoE specifications as I only discovered
this method of power supply today. Looks like I need to incorporate a
PoE injector as Mark pointed out. Cheers--
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There are two forms of PoE, only one of which is really part of the standard.
Active PoE (the standardised one) involves an active handshake to determine
the capabilities of the unit and to deliver the right power to it. You do not
want this type (its 48V for a start to follow the normal telephone power
supplies).
Passive PoE just uses the extra pairs to deliver power, typically between
12 and 24V, but there is no hard and fast rule. There are passive injectors
available which take two RJ45s and a round power connector. These can
be used at either end, so use one to inject and the other to remove the
power. You might try the ones that PcEngines supply (I am not sure where
they get them from) at PC Engines poe1a2 product file. You could use
this with a 5V power supply.
Be careful not to apply passive PoE to a normal RJ45 socket, many of them
have pins 4, 5, 7 and 8 grounded, which will put a short circuit on the power
supply, but the injector will isolate you from this.
David