cat5 cabling from patch panel to wall port

Posted on 2006-04-27
Last Modified: 2008-02-01
Hi All,

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

ie what colour goes where?

Question by:gareth629
    LVL 11

    Accepted Solution

    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

    Hope this helps,

    LVL 28

    Expert Comment

    1 white/green
    2 green/white
    3 white/orange
    4 blue/white
    5 white/blue
    6 orange/white
    7 white/brown
    8 brown/white
    LVL 11

    Expert Comment


    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

    "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.


    Author Comment

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

    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    Enabling OSINT in Activity Based Intelligence

    Activity based intelligence (ABI) requires access to all available sources of data. Recorded Future allows analysts to observe structured data on the open, deep, and dark web.

    There are two basic ways to configure a static route for Cisco IOS devices. I've written this article to highlight a case study comparing the configuration of a static route using the next-hop IP and the configuration of a static route using an outg…
    In the world of WAN, QoS is a pretty important topic for most, if not all, networks. Some WAN technologies have QoS mechanisms built in, but others, such as some L2 WAN's, don't have QoS control in the provider cloud.
    After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
    After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

    761 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    12 Experts available now in Live!

    Get 1:1 Help Now