Cat5e wiring problem

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wdnitz

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Nov 21, 2011
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I just purchased some RJ-45 jacks for Cat5e and discovered that they were marked incorrectly. The error is that the blue pair is inverted according to 568A & 568B standards. (Pin 4 is color coded for white/blue and pin 5 is blue.) Some of these jacks were terminated onto plenum cables with correctly marked RJ-45 jacks on the other end. The effect is that TRD2+ and TRD2- get swapped from one end to the other. I'm guessing this going to cause a problem. Is it?
 
Joined
Jul 29, 2001
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I would say it sill cause an issue eventually. It would be best to pull them all and wire them all up 568B
 

jiml8

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Jul 2, 2005
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Some NICs autodetect the way the cable is wired. If your NICs do this, you won't have any trouble. Sounds to me like you bought crossover cables without intending to.
 
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