Type A vs Type B

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 Question by Janna Yeargin posted 02 Mar 2001
 Type A vs Type B
My company recently had our data closets rebuilt
in preparation for gigabit ethernet. They wired
everything from the jack to the patch panel as A,
but the patch cords from the patch panel to the
switch are B. The patch cables connecting each
device is also B. Everything is working, yet your
documentation would indicate that it shouldn't.
What kinds of problems would you anticipate that
this situation could cause?
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 Answer by Dmitri Abaimov posted 05 Mar 2001
Dear Janna,

The always confusing T568A and T568B RJ45 pin layout schemes stand for jacks only. They don't address plugs at all. Assuming that regular cords are just one-to-one (straight through) and crossover cords needed for hub-less connections have pairs 2 and 3 crossed.

Thus you should not anticipate ANY problem caused by the cords marking. It was just incorrect to put any mentioning of T568A or T568B on the cords' plugs.

Sincerely,
Dmitri Abaimov, RCDD

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