Unused lines in Cat 5

[MIPS]

I'm trying to fix a temporary solution where I need to power several IP cameras which do not support PoE. Right now I power them using extension cords.
My old boss found out that there was unused lines in the Cat 5/5e spec so when he ran his ethernet cable and crimped the ends, he left two leads out for ground and +12V.
Thing is I never asked him what the lines and all the pinouts I find online now assume you are using gigabit wiring methods which uses all the lines.
Anyone here a bit more knowledged in this?

[Shadaez]

[url]http://www.ertyu.org/steven_nikkel/ethernetcables.html[/url] has info on which are unused

[editline]15th February 2012[/editline]

mostly this section:
[img]http://puu.sh/h3ZA[/img]
but it seems like it may cause some interference.

[Van-man]

I seriously hope that 12volt power supply has a very clean output.
[B]
EDIT:[/B]
If you wanna follow the standards, then pin 4 & 5 is DC+ and pin 7 & 8 is DC-
[url]https://en.wikipedia.org/wiki/Power_over_Ethernet#Notes[/url]

[bohb]

[QUOTE=Van-man;34716566]I seriously hope that 12volt power supply has a very clean output.[/QUOTE]

He could always rip an inductor out of a dead PSU and throw it on the power source side to get rid of power noise. Though having too many or too high of a rated inductor can increase the line capacitance and cause the voltage to be higher than it should be.

[MIPS]

[QUOTE=bohb;34718592]He could always rip an inductor out of a dead PSU and throw it on the power source side to get rid of power noise. Though having too many or too high of a rated inductor can increase the line capacitance and cause the voltage to be higher than it should be.[/QUOTE]

Or just attach filter caps to both ends of the cable.