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Ethernet Cable – Color Coding Diagram</h1>
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 insure all connectors and cables 
are modified in accordance with standards. The Internet Centre and its 
affiliates cannot be held liable for the use of this information in 
whole or in part.<br />

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<strong>T-568A Straight-Through Ethernet Cable</strong></div>
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<img alt=" " border="0" height="250" src="http://www.incentre.net/images/ethcable568a.gif" width="400" /></div>
The TIA/EIA 568-A standard which was ratified in 1995, was replaced 
by the TIA/EIA 568-B standard in 2002 and has been updated since. Both 
standards define the T-568A and T-568B pin-outs for using Unshielded 
Twisted Pair cable and RJ-45 connectors for Ethernet connectivity. The 
standards and pin-out specification appear to be related and 
interchangeable, but are not the same and should not be used 
interchangeably.<br />

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<strong>T-568B Straight-Through Ethernet Cable</strong></div>
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<img alt=" " border="0" height="250" src="http://www.incentre.net/images/ethcable568b.gif" width="400" /></div>
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.<br />

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<strong>RJ-45 Crossover Ethernet Cable</strong></div>
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<img alt=" " border="0" height="250" src="http://www.incentre.net/images/ethcablerj45cr.gif" width="400" /></div>
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.<br />

<strong>Ethernet Cable Instructions:</strong><br />

<ul>
<li>Pull the cable off the reel to the desired length and cut. If you 
are pulling cables through holes, its easier to attach the RJ-45 plugs 
after the cable is pulled. The total length of wire segments between a 
PC and a hub or between two PC’s cannot exceed 100 Meters (328 feet) for
 100BASE-TX and 300 Meters for 10BASE-T.</li>
<li>Start on one end and strip the cable jacket off (about 1″) using a 
stripper or a knife. Be extra careful not to nick the wires, otherwise 
you will need to start over.</li>
<li>Spread, untwist the pairs, and arrange the wires in the order of the
 desired cable end. Flatten the end between your thumb and forefinger. 
Trim the ends of the wires so they are even with one another, leaving 
only 1/2″ in wire length. If it is longer than 1/2″ it will be 
out-of-spec and susceptible to crosstalk. Flatten and insure there are 
no spaces between wires.</li>
<li>Hold the RJ-45 plug with the clip facing down or away from you. Push
 the wires firmly into the plug. Inspect each wire is flat even at the 
front of the plug. Check the order of the wires. Double check again. 
Check that the jacket is fitted right against the stop of the plug. 
Carefully hold the wire and firmly crimp the RJ-45 with the crimper.</li>
<li>Check the color orientation, check that the crimped connection is 
not about to come apart, and check to see if the wires are flat against 
the front of the plug. If even one of these are incorrect, you will have
 to start over. Test the Ethernet cable.</li>
</ul>
<strong>Ethernet Cable Tips</strong>:<br />

<ul>
<li><em>A straight-thru cable has identical ends.</em></li>
<li><em>A crossover cable has different ends.</em></li>
<li><em>A straight-thru is used as a patch cord in Ethernet connections.</em></li>
<li><em>A crossover is used to connect two Ethernet devices without a hub or for connecting two hubs.</em></li>
<li><em>A crossover has one end with the Orange set of wires switched with the Green set.</em></li>
<li><em>Odd numbered pins are always striped, even numbered pins are always solid colored. </em></li>
<li><em>Looking at the RJ-45 with the clip facing away from you, Brown is always on the right, and pin 1 is on the left.</em></li>
<li><em>No more than 1/2″ of the Ethernet cable should be untwisted otherwise it will be susceptible to crosstalk.</em></li>
<li><em>Do not deform, do not bend, do not stretch, do not staple, do 
not run parallel with power cables, and do not run Ethernet cables near 
noise inducing components.</em></li>
</ul>
<strong>Basic Theory:</strong><br />

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.<br />
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Ethernet Cable – Color Coding Diagram

Ethernet Cable – Color Coding Diagram The information listed here is to assist Network Administrators in the color coding of Ethernet ca...

Mikrotik Book

Ethernet Cable – Color Coding Diagram

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