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Author Ethernet Cables
hscott63

2005-03-22, 3:14 am

Will mixing T-568A and T-568B Ethernet cables cause any problems on a network? Thanks!
darthw

2005-03-26, 3:19 am

As long as both ends of the patch cable are wired to the same standard it shouldn't matter. In other words, if you wire the horizontal runs from the wall jack to the patch panel as T-568B, both ends of the run need to adhere to the same standard. Then you could patch a cable between the patch panel and switch that is wired as 568A without a problem, as long as both RJ45 connectors are wired as 568B. If you mistakenly wire one end -of either the patch panel or wall jack OR either end of the patch cable - as 568A and the other end as 568B you have a crossover cable, and then could have problems.

However, to prevent confusion it is best to adhere to one standard throughout the wiring infrastructure. That way when you look at one end of the cable you, or another technician that follows after you, has no doubt what the standard configuration is. So, then a crossover connection is not accidently punched-down later.
sandy7000

2005-03-26, 11:17 am

I just learned from a network administrator that it now matters how a cable is wired due to 100 MB throughput. On the old 10 MB, it didn't make any difference. Has anyone else heard of that?
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