HOW TO MAKE YOUR OWN POE INJECTOR

Coming from an R&D background, I know the value of good tools and peripherals and I don't mind spending my hard earned dollars on them.

But I hate to waste money when the cost of a device can not be justified. The same is true for POE switches. It is shocking to see that cost of a POE switch is approximately 4 to 5 higher than normal Ethernet switch.

Anyway, let us come to the main topic of how to make your own POE injector.

1) RJ45 PIN CONFIGURATION:

RJ45 pin configuration varies from region to region and in New Zealand we follow 568A which is as given here. You can google to find RJ45 pin configuration for your region.

Now, out of the total 4 pairs, 2 pairs are used for data transmission and two pairs remain unused. In 568A, pin nos. 4,5,7 and 8 are unused.

So, while crimping your RJ45 connector, leave 7 and 8 out of the connector and crimp the remaining 3 pairs. You can choose to use 4 and 5 as well but practically I have found that crimping becomes easier if you drop out the last pair.

Also, if your device takes more power and cable runs longer distance, you may decide not to crimp 45, 7 and 8 and use one pair as positive and the other pair as negative.

DO NOT REACH A CONCLUSION UNLESS YOU HAVE TRIED IT !!!

We made a patch cable where we did not crimp 7 and 8 pins and connected these two wires to a DC plug as required by our camera. It looked like this.

Then, we connected a normal Ethernet Switch with our IP camera giving power on extra brown and white/brown wires.

And then we configured our IP camera with these connections and you can see below the camera output on the screen.

BUT WHAT IF THE POE DEVICE DOESN'T HAVE A POWER INPUT:

Well, you are stuck if this is the case because then you will have to use POE switch because unlike POE injectors, POE switch uses data signals to give power to the POE devices. Data signal is modulated over power by the POE switch and it is demodulated at the POE device’s end.

So, if two cameras have exactly similar specs and have the same cost, but one has separate power input and the other doesn't, then the camera with the power input will cost you less because in that case you will save money by not using the POE switch.

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