Instructables

Network Cable hack

Picture of Network Cable hack
when i was thinking to do this instructable i thought it would be bit out dated. then i thought might be use for few. lets see how it goes.
Before you start with this instructable i will assume you have a bit of the experience of making network cables like cross over cable and stright cable. i'll include the orignal layout of the standard cable and show you what else we can achive from the same wire.
[ info: source http://www.ertyu.org/steven_nikkel/ethernetcables.html ]

we'll be using:
cat5-cat5e networking cable.
few RJ45 connectors ( for network )
few RJ11 Connectors ( for phone )
Cramping tool ( for network wire )

 
Remove these adsRemove these ads by Signing Up

Step 1: Cable know how and tool.

i'll start with the orignal layout. this pic is taken from the site.(http://www.ertyu.org/steven_nikkel/ethernetcables.html) and they explaind evrything in very detail. Which i won't do here.
there are few things to remmber while you are working on this instructable.

1- there are 4 wires usable for the actual cable and rest 2 pairs are useless. ( we'll utilize rest of the 4 wires)

2- orignal layout shows the color coding and which wire go were.... ( rare case if some is color blind than....???) u can choose what ever color for your cable but 2 things ( remmeber which color you are using on one end of the cable caz we'll utilize the same on the other end. and why the give these color coding.. to implement global standard for networking.

Newer network cables (gigabit( use all 8 lines, Caveat emptor.
LazloH3 years ago
I also feel like it should be notated that cables have a specific amount of twists in them to pair them up and a specific amount of twists for each pair around each other. Its done like this to reduce the amount of cross talk between a cable pair and reduce whats called NEXT and FEXT. By changing a cable in this fashion you run the risk of introducing a LOT of signal noise and generating packet loss in your network. Pairing two cables together or adding a phone cable probably will not cause a problem. When you add a power brick that is spliced into the cable.. you will have problems with signal.
Hi mate just to let you know from what i seen so far this power adapter is DC
and DC does not produce such noise when the AC is filitered correctly, yes AC you will get cross talk but as its a analogue signal it would be ignored by the switch or router or other network device.

i have Run many POe devices and did not see any packet loss at 100Mb or 1000mb on Cat5e but for those people really worried there is cat6 or cat5e shielded and cat6 shielded.

as for phone lines and data one is data the other is voice analogue and digital so there maybe a small amount of jumping on long distance but again ignored by the device.

btw Full Duplex and half Duplex when in Full Duplex its 8 pair when in Half is 4 pair full duplex on 100mb is 200mb one pipe of 100mb up and the other 100mb down same for 1GB but its run at 2Gb = 1Gb in each direction.

laptop power Supplies depending on the laptop you will need different wattage so lets say your laptop is 19volts at 4Amps 76Watts is what i see most laptops at now days, i would not want to run 76watts via cat5+ as the wattage is too much when cables get warm thats a bad thing.

small devices like routers / modems / wireless access points are 12v 2amps 24watts and thats the worst case most are way less then that and that is what POe is for.

thanks for the instructable.
hintss LazloH3 years ago
and you know what? I have a gauss meter sitting on my desk right now. lets test some stuff, shall we?

netbook power cord, DC side: undetectable
DC wires in LED desk lamp: undectable
netbook power brick: off the scale
AC power cord: off the scale
the wiring in the wall: about 3 mG

you are wrong, my friend

and at 100,000 packets a second, and error correction, and packet checksums, does a single dropped packet really even matter?
arifsethi (author)  LazloH3 years ago
http://en.wikipedia.org/wiki/Power_over_Ethernet
hope this artical will be help full.
mathieulj3 years ago
Just as an FYI for everyone's benefit;
There are four pairs of wires in cat5 cable. With basic 10/100Base ethernet, these work since only two pairs are being used. If you want the more recent 1000Base(or higher speeds), all four pairs are needed.
however, gigabit will automatically drop down the speed, and, although its not part of the standard, some stuff will run at 500 using half the pairs
arifsethi (author)  mathieulj3 years ago
you r quite right my friend 1000base-t or gigabit ether net utilizes all 8wire or 4pairs. sorry i never said about this in my instructable and 2ndly i said in start it will be bit out date but will be helpfull for few :).
thanks again.
LazloH3 years ago
PoE is a little different than a basic power adapter. That being said.. I encourage your experimentation and wish the best with your cables.
hintss LazloH3 years ago
I know. That was for people too cheap to buy PoE machines and power injectors and such
Pro

Get More Out of Instructables

Already have an Account?

close

PDF Downloads
As a Pro member, you will gain access to download any Instructable in the PDF format. You also have the ability to customize your PDF download.

Upgrade to Pro today!