The PoE (Power Over Ethernet) thread

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NotMyRealName

So I see there isn't much or any info on POE on TE. Hoping this would be the start of some good discussions.

I always knew about the system but never needed to dabble in it. Recently a friend asked me to help him relocate his DIR-816 for better wifi spread through his house. The location we finalised on does not have a power outlet nearby and we would need to install one.

So i figured since his incoming internet connection from the local ISP is anyway a 2-pair cable, all we need to is connect it to a new cat5/6 cable and use the other 2 pairs for PoE.

This is going to be a semi-judaad job, not using a PoE splitter, but by pretty much hard-wiring everything. I will be buying DC male female connectors, the router's ac adapter will plug into the female socket which will be soldered to the extra pair(s) in the new lan cable. On the other end, the wires would be soldered to the male pin which will plug into the router's power.

I'm thinking of using both the extra pairs instead of just one for two reasons. One is to handle any extra possible heat, and the other is to reduce voltage drop as much as possible. The cable run would be max. 5-metres.

I'm not sure about one thing. Should i connect alternate wires of each twisted pair to + and - respectively, or use one pair for + and the other pair for - ?
 
Forgot to mention, output is DC 12V, 0.5amps[DOUBLEPOST=1473310276][/DOUBLEPOST]
bigbyte said:
This should do your job if you are not adamant on DIY or not using POE splitter.
http://www.ebay.in/itm/162172941090

It has both injector and splitter for power.
Click to expand...

Nice, saves a lot of work and is MUCH neater. The barrel connector should be the standard used in most devices right? I see they've used sequential wires, i.e. a pair for + and - each, not alternate, for power.
 
Just asking this question- Won't data get corrupted with voltage flowing in these wires? The wires carrying the data will be in close contact to the wires carrying voltage and there could be interference.
 
Julian said:
I see they've used sequential wires, i.e. a pair for + and - each, not alternate, for power.
Click to expand...

It MAY turn out to be true, but how did you conclude that by looking at the pics?

Edit: found it. They have mentioned the power pins. They have followed IEEE standards for POE

6pack said:
Won't data get corrupted with voltage flowing in these wires? The wires carrying the data will be in close contact to the wires carrying voltage and there could be interference.
Click to expand...

No.
 
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6pack said:
Just asking this question- Won't data get corrupted with voltage flowing in these wires? The wires carrying the data will be in close contact to the wires carrying voltage and there could be interference.
Click to expand...

Bcoz ... twisted pair ;-)

And DC[DOUBLEPOST=1473314097][/DOUBLEPOST]Jeez man bigbyte, you have no idea how much of my time you've saved. Heck I dont even need to go to my friend's place. Told him to order it and plug n pray.

I never imagine there would be a simple splitter implementation of PoE available so cheap on ebay. Had seen some of the big boxy devices earlier.
 
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