Ethernet Cable Colors: Color Code Standards The information listed here is to assist Network Administrators in the color coding of Ethernet cables. Please be aware that modifying Ethernet cables improperly may cause loss of network connectivity. Use this information at your own risk, and ensure all connectors and cables are modified in accordance with TIA standards. Basic Theory:By looking at a T-568A UTP Ethernet straight-thru cable and an Ethernet crossover cable with a T-568B end, we see that the TX (transmitter) pins are connected to the corresponding RX (receiver) pins, plus to plus and minus to minus. You can also see that both the blue and brown wire pairs on pins 4, 5, 7, and 8 are not used in either standard. What you may not realize is that, these same pins 4, 5, 7, and 8 are not used or required in 100BASE-TX as well. So why bother using these wires, well for one thing its simply easier to make a connection with all the wires grouped together. Otherwise you'll be spending time trying to fit those tiny little wires into each of the corresponding holes in the RJ-45 connector. T-568A Straight-Through Ethernet Cable Cat5e Cables | Cat6 Cables The T-568A standard is supposed to be used in new network T-568B Straight-Through Ethernet Cableinstallations. Most off-the-shelf Ethernet cables are still of the T-568B standard; however, it makes absolutely no functional difference in which you choose. Cat5e Cables | Cat6 Cables Both the T-568A and the T-568B standard Straight-Through cables are used most often as patch cords for your Ethernet connections. If you require a cable to connect two Ethernet devices directly together without a hub or when you connect two hubs together, you will need to use a Crossover cable instead. RJ-45 Crossover Ethernet CableCat5e Crossover Cables | Cat6 Crossover Cables A good way of remembering how to wire a Crossover Ethernet cable is to wire one end using the T-568A standard and the other end using the T-568B standard. Another way of remembering the color coding is to simply switch the Green set of wires in place with the Orange set of wires. Specifically, switch the solid Green (G) with the solid Orange, and switch the green/white with the orange/white. How to Build an Ethernet Cable Instructions:
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Ethernet Cable Tips:
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Wednesday, 21 November 2012
RJ45 Colors and Wiring Guide Diagram TIA / EIA 568 A B
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It is very nice to "do the job correct the first time" but not everyone has the budget to upgrade everything all at once.
ReplyDeleteSo running the Ethernet Patch Cable is the first step and putting in Cat6 is the start.
A clear and concise article! Thank you! Was trying to troubleshoot my cable and I'm now betting it's the interference due to > 1" being untwisted at the ends.
ReplyDeleteYep, after a few more tries to get the wires to the "minimal necessary length", everything works as expected! Thanks again for the write-up!
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