2. 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.
3. 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.
4. Anyway, let us come to the
main topic of how to make your
own POE injector.
5. 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.
6. 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.
7. 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.
8. 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.
9. Then, we
connected a normal
Ethernet Switch
with our IP camera
giving power on
extra brown and
white/brown wires.
10. And then we
configured our IP
camera with
these
connections and
you can see
below the
camera output on
the screen.
11. 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.
12. 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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