Rx and Tx

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 Question by kent z posted 26 Sep 2001
 Rx and Tx
why are the Rx 3 and 6 pin seperate but the Tx 1 and 2 pin together. for the enthernet cabling
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 Answer by Dmitri Abaimov posted 29 Sep 2001
This is the layout that had been chosen to ensure backward compliance with RJ-11 and RJ-12 modular jacks. Pair number 1 is always in the center of the jack, which makes it possible to plug RJ-11 plug into RJ-45 jack and have analog phone working. Pair number two would be the adjacent conductors, so #1 gets in between. That's why pins #3 and #6 are separated. Pins #1 and #2 form pair #3 which happens to be outside reach for the older plugs, so they made one next to each other since I believe it was just easier to do.

Sincerely,
Dmitri Abaimov, RCDD

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