I appreciate Chris taking the time to post this article ... if you can improve on it then perhaps you should post an article, too. don't just criticize ... share your knowledge to help others, if you can.

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Thank's for supporting my article.
It make sense what you wrote, it could be a BC. I checked too on the inet for some datasheet but with no result.
Thanks.
My best regars.

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Thanks for sharing this modification. Despite some comments it solved your problem and this is the most important.

I tried to find some datasheet on this DJA004 but Google didn't return any useful result. I guess it is some kind of Buck Converter and this would explain the inductor and the diode:

https://en.wikipedia.org/wiki/Buck_converter

Cheers,
Gerald

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Hi David, thanks for reading my post and for the explanation of the 1000BASED-T communication standard.
Of course does Gigabit equipment can't be powered through this PoE wiring as I described. It's normally. There fore are several labels on a PC motherboard, routers, switches etc.
Please, check IEEE standards, check user manuals from well known network manufacturers who makes PoE connections to their devices as I did.
As I wrote in one of my comment, 1000BASED-T is a different story.
Also, a technicians who look to the picture where are described the pinouts of
a LAN RJ45 connector, they would never use the 1000BASED-T pinouts colon because there are no N/C wirings. As a technician I would never mix any signals or voltage through a wiring which is used for another signal.
But, it is possible to mix the data line and the power line, maybe I will write in another article " LAN through 220ACV wall connector "...
Conclusion:
If you have any normal router, switch or whatever 10/100Mbs LAN device you can power it through a passive or active POE which is the same as I wrote in this article.
David, I not angry, you are well come and any comment are well come.
My best regards

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https://en.wikipedia.org/wiki/Power_over_Ethernet#Powering_devices

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Thanks for supporting my article.
With this modified device you can connect all the standard LAN equipment on the world. If you check the pinout picture you can see there are 3 standardized LAN connections. There are 2 of them which was standardized for POE use by IEEE 802.3 standard. Which means the 10BASE-T and the 100BASE-T. In most of case, commercial network equipment are 10 or 100 Mbs equipment which are use only two pairs of wires for data communication. The other 2 pairs you can use free for transmitting power over Ethernet.
So, assuming if you bought a router and you will use the original DC adapter with this POE method you have nothing to worry. But! if you use another not compatible adapter to power your router then you have the same effect like you connected it directly to the router, with or without the POE switch.
But! even then your LAN interface would not be burned on the PC or router because the POE pairs are not in the LAN connector. There are only two pairs of wiring in the RJ45 connector.
The 3. type of connection is the 1000BASE-T which means Gigabit networking standardized under the IEEE 802.3ab standard. That type of equipment is not allowing use of POE.
But that is another story...
So, feel free to use my POE method to use with the right adapter on your router, switch or whatever equipment under the IEEE 802.3 standard what is marked on every device.
My best regards.

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good work ! and Thanks for sharing.

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Good idea if this modification is subject to "CCTV" but Pleas. do not club it with any an other LAN environment i.e. if you are using Internet router or normal LAN Switch or Computer which works on 5V DC. or that unit can be easily get damaged by connecting this equipment.

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