passing data through UTP wires/cables

Unanswered Question
Nov 7th, 2007

Hi there! I will appreciate it very much if someone can help me with the following question.

If you use opposite currents, can you still send data in one direction?

What I'm referring to is the fact that the pairs of wires in UTP cables are twisted together and the currents run in opposite directions, therefore cancelling out any crosstalk/interference. However, why is it then that when using a crossover cable (connecting switch to switch) that data on a pair of wires is sent in one direction ie wires 1 & 2 connect to wires 3 & 6. Surely, data from 1 & 2 cannot go in the same direction if the current is going in opposite directions within the pair of wires?

Thank you in advance for all your help.

Best wishes,


I have this problem too.
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lgijssel Wed, 11/07/2007 - 23:14

You really seem to be struggling with this?

The answer is that using a cross-cable makes no difference for the current-flows in the wire. As long as one side is connected to an electrical input and the other end to an output, data can be sent. The function of a cross-cable is to establish just that.




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