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  #1  
Old Jan 11, 2004, 03:01 PM
upur0 upur0 is offline
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Default Can i change an ethernet cable to a crossover cable?

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I have an ethernet cable laying around that i dont use, but i need a crossover cable, so is there a way for me to cut open the ethernet cable and swap a wire or two to make it a crossover cable. this does not seem out of the question as that is all a crossover cable is, an ethernet cable with 2 wires swapped or something similar to that.
can someone please help me?
thanks
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  #2  
Old Jan 11, 2004, 04:07 PM
ElaineM ElaineM is offline
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Yes, you can change it to a crossover cable but you'll need to cut off one end, have a new RJ45 connector, and something to crimp it shut with. You might want to have a look [url=***********.homepcnetwork.com/][b]HERE[/b] under How Do I "make my own network cables". The trick is to keep the wires straight and make sure each wire is making contact into the connector. You really have to shove them up in there. The new end should look like this with the flat side up and the jack end at the top.

From left to right:
White-Orange
Orange
White-Green
Blue
White-Blue
Green
White-Brown
Brown
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  #3  
Old Jan 11, 2004, 04:15 PM
Richskie Richskie is offline
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You would actually need to switch 4 wires as each data line has its own ground / shield. Probably going to be easier to buy one. If you really want to make one...

[I]Majority of the manufacturers of ready made cable follows the EIA568B standard here.

Pair 1 Blue, Blue/White
Pair 2 Orange, Orange/White
Pair 3 Green, Green/White
Pair 4 Brown, Brown/White

They are not lined up in the RJ45 in straight order from Pair 1 4 though. The following is the configuration, with Pin 1 being the left-most pin when looking into the RJ45 socket.

Pin 1 T2 Orange/White
Pin 2 R2 Orange
Pin 3 T3 Green/White
Pin 4 R1 Blue
Pin 5 T1 Blue/White
Pin 6 R3 Green
Pin 7 T4 Brown/White
Pin 8 R4 Brown

Tn Tip : +ve for the nth pair
Rn Ring : -ve for the nth pair

Pairs 2 and 3 are used in Ethernet[/I]

So you would need to switch pair 2 & pair 3.
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  #4  
Old Jan 11, 2004, 04:20 PM
upur0 upur0 is offline
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so, do i just swap the blue and green cables?
and do i have to get a new crimp? cant i just cut the cable open and tape the wires back together in the crossover pattern?
and on the back of the cable (opposite of the side of the clip) the colors are:
white
orange
white
blue
white
green
white
brown

so, can i just cross the blue and green wires?

and do i need to cross the white wires that go along with them? when the guy was making my cable, he messed up a few times and complained about how only 4 wires do something, but you gotta do 8, so do i need to cross them?
thanks

Last edited by upur0; Jan 11, 2004 at 04:31 PM.
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  #5  
Old Jan 11, 2004, 10:03 PM
UAPyro UAPyro is offline
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Yea, you need to get a crimping tool, and also the RJ-45 connectors.
You could try to cut the cable open and splice the wires together, but it would almost certainly not work very well, if at all, so there really isn't any use to attempting that.
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  #6  
Old Jan 12, 2004, 05:27 AM
Ronaldsoft Ronaldsoft is offline
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mate buy one and save a headache, if u aint got the tools.
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