25 pair Cat5 punch down Color Code

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 Question by Jim Forrest posted 18 Sep 2000
 25 pair Cat5 punch down Color Code
So far I have seen only a punch down that counts for tip and ring. From what I have seen so far the 5 white, then red and so on. Mu question is what would be the punch down seq. for 568b? thanks in advance.
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 Answer by Dmitri Abaimov posted 19 Sep 2000
Dear Jim,

When you terminate 25-pair cable onto a modular (RJ-45) patch panel, you just assume that the first 4 pairs stand for port #1 and numbered as usual.

Then pairs 5-8 are going to port #2 and pair 5 becomes pair 1 (pins 4-5) and so on.
Then pairs 9-12 are going to port #3 and 9th becomes #1.

The whole thing should be repeated 6 times.

After you've done with all the first 24 pairs, and you've tested everything, cut 25th (violet-slate) pair off.

To make the job easier, I can adivise you to print out both schemes on a color printer and have them both in front of your eyes when you do terminations.

Have a good luck with your installation!

Sincerely,
Dmitri Abaimov, RCDD

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