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rj45 connectors

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Why RJ45 connectores wired with crossed pairs.
:?

If only the colour code is concern, it can be wired as

1,2 brown -brown/white
3,4 orange-orange/white
5,6 blue-blue/white
7,8 green-green/white

But as athumb of rule orang/white and blue/white are cross connected.

what is the reason.

Are the pines (1 to 8) assigned to any function similar to RS323 pin connections.
eg: RS232 pin2 Tx
pin3 RX
 
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