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cat5 cabling from patch panel to wall port

Hi All,

how search the wires inside cat5 be attached to a patch  panel and the opposite wall jack?

ie what colour goes where?

Thanks
Gareth
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gareth629
Asked:
gareth629
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1 Solution
 
grsteedCommented:
What color goes where depends on whether your patch panel/wall jacks are TIA/EIA 568 A or B. It is important to note that if your patch panel is wired as TIA/EIA 568A, then your jacks need to also be wired as TIA/EIA 568A. Likewise if they are TIA/EIA 568B, both ends need to be wired as B.

The only difference between A and B is where pairs 2 and 3 (pins 1,2,3,6) end up. The hardware can be the same and they may provide a label for A or B which shows what color to use on what pin.

These days B is most common and that uses the orange/white pair on pins 1 and 2, and the green/white pair on pins 3 and 6. The blue/white pair (pins 4 and 5)  isn't used for Ethernet and the brown/white pair (pins 7 and 8) may be used for Power over Ethernet (PoE) if you have IP phones.

This link explains it in more detail

http://en.wikipedia.org/wiki/TIA-568B

Hope this helps,

Gary
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mikebernhardtCommented:
1 white/green
2 green/white
3 white/orange
4 blue/white
5 white/blue
6 orange/white
7 white/brown
8 brown/white
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grsteedCommented:
@mikebernhardt

That would be correct for T568A.

For T568B it would be,

1 white/orange
2 orange/white
3 white/green
4 blue/white
5 white/blue
6 green/white
7 white/brown
8 brown/white

As far as which one is preferred, it depends. From this link http://www.duxcw.com/faq/network/diff568ab.htm

"Q.  What is the difference between the ANSI/TIA/EIA T568A and T568B color code wiring standards?

A.  T568A and T568B are the two color codes used for wiring eight-position RJ45 modular plugs.  Both are allowed under the ANSI/TIA/EIA wiring standards.  The only difference between the two color codes is that the orange and green pairs are interchanged.   T568A wiring pattern is recognized as the preferred wiring pattern for this standard because it provides backward compatibility to both one pair and two pair USOC wiring schemes.  The T568B standard matches the older ATA&T 258A color code and is/was(?) the most widely used wiring scheme.  It is also permitted by the ANSI/TIA/EIA standard, but it provides only a single pair backward compatibility to the USOC wiring scheme.  The U.S. Government requires the use of the preferred T568A standard for wiring done under federal contracts."

I have't worked in many government buildings and find the the B standard is used more often.

Gary
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gareth629Author Commented:
Thanks Gary, as usual always helps that little bit more with and explanation and a link
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