T568A/B Crossover Wiring

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 Question by Ted Riesz posted 05 Oct 2006
 T568A/B Crossover Wiring
I have seen two different pinouts for an Ethernet crossover cable that both claim to follow the T568A/B standard. One is Pin 4 to 4, 5 to 5, 7 to 7 and 8 to 8. The other is Pin 4 to 5, 5 to 4, 7 to 8, and 8 to 7. In fact I bought pre-made crossover cables that were wired the second way. (4 to 5 etc.) Why are there two different variations and which is the current standard?
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 Answer by Joseph Golan posted 10 Oct 2006
Dear Ted,
It all depends on what type of network you are on. There is a different configuration for 10/100BaseT vs. 1000 BaseT ethernet

Here is a link to one of our pages that illustrates the proper crossover for these and other networks:

http://www.cabling-design.com/references/pinouts/


Sincerely,
Joseph Golan, RCDD

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