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RJ45 Colors and Wiring Guide Diagram TIA / EIA 568 A B
Ethernet Cable Colors: Color Code Standard s
The information listed here is to assist Network Administrators in the color coding of Ethernet cables. Please be aware thatmodifying Ethernet cables improperly may cause loss of network connectivity. Use this information at your own risk, andensure 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 theTX (transmitter) pins are connected to the corresponding RX (receiver ) pins, plus to plus and minus to minus. You can also seethat 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 isthat, 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 forone thing its simply easier to make a connection with all the wires grouped together. Otherwise you'll be spending time tryingto fit those tiny little wir es into each of the corresponding holes in the RJ-45 connector.
T-568A Straight-Through Ethernet Cable
The T-568A standard is supposed to be used in new networkinstallations. Most off-the-shelf Ethernet cables a re still o f the T-568Bstandard; however, it makes absolutely no functional difference in whichyou choose.
T-568B Straight-Through Ethernet Cable
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RJ45 Colors : RJ45 Color Guide Diagram - straight through and cros... http://www.cablesplususa.com/rj45-utp-guide.php
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