RJ45 Colors and Wiring Guide Diagram TIA/EIA 568 AB

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.
The T-568A standard is supposed to be used in new network installations. Most off-the-shelf Ethernet cables are still of the T-568B standard; however, it makes absolutely no functional difference in which you choose.
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.
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:
Pull the cable off the reel to the desired length and cut using wire cutters or scissors. If you are pulling cables through holes, it's easier to attach the RJ-45 plugs after the cable is pulled.The total length of wire segments between a PC and a switch or between two PC's cannot exceed 100 Meters (328 feet) for 100BASE-TX and 300 Meters for 10BASE-T.
Start on one end and strip the cable jacket off (about 1") using a wire stripper or a knife. Be extra careful not to nick the wires, otherwise you will need to start over.
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.
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 crimp tool.
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.
Ethernet Cable Tips:
A straight-thru cable has identical ends.
A crossover cable has different ends.
A straight-thru is used as a patch cord in Ethernet connections.
A crossover is used to connect two Ethernet devices without a hub or for connecting two hubs.
A crossover has one end with the Orange set of wires switched with the Green set.
Odd numbered pins are always striped, even numbered pins are always solid colored.
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.
No more than 1/2" of the Ethernet cable should be untwisted otherwise it will be susceptible to crosstalk.
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.
Source from copper & fiber optic cable manufacturers

The Difference between Cat5 Network Cables and Cat5e Network Cables

f you are considering using the different twisted-pair copper cables to transmit data in the networks or other applications, it is more or less that you will come across terms like Category 5, Category 5e, Category 6, or even Category 6e, the network Ethernet cable standard defined by the Electronic Industries Association (EIA) and Telecommunications Industry Association (TIA). Cat5 and Cat5e are two of the most popular network cables for most wired local area networks (LANs) today. Just in case you are not too familiar with this two copper wiring technology, I here would like to provide you with a few knowledge and tips in the way each media handled, network support, crosstalk and bandwidth of Cat5 network cables and Cat5e network cables, hope it will help you make better decision when choose the right one for you critical applications.

Cat5 cable

Cat5 is the fifth generation of twisted pair Ethernet technology and the most commonly used network cables than any other category twisted pair cables. Cat5 cable contains four pairs of copper wires, just the same as Cat5e cables. Cat5 cable can support 10BASE-T and 100BASE-T network standards. Cat5 cable is available into two sub-types: unshielded twisted pair (UTP) and shielded twisted pair (S/FTP) measure of extra protection against interference, which is widely used in Europe.

Category 5 cable can be either solid type or stranded type: Solid cat5 cable is more rigid and supports longer length runs, the solid Cat5 cable is more used for fixed wiring configurations such as office buildings. While stranded Cat5 cable due to its flexible and pliable features, is most likely to be used as patch cables for shorter distance applications.

Cat5e cable

Cat5e stands for Category 5, enhanced cable which developed on the base of Cat5. Except that it fulfills higher standards of data transmission, it almost goes the same line with the basic Cat5. Cat5e supports networking at Gigabit Ethernet (1000BASE-T), network running speed up to 1000 Mbps, Cat5e cable is completely backwards compatible with Cat5, and can be used in any
application in which you would normally use Cat5 cable. Category 5e is indeed improved the specifications of Category 5 by reducing some crosstalk from one cable to anther cables.
As with all other types of twisted pair EIA/TIA cabling, Cat5e cable runs are limited to a maximum recommended run length of 100m (328 feet). In normal practice it is limited to 90 m to allow for up to 5 m of Cat5e patch cable at each end.

As all the comparisons above, Cat5e runs a faster pushing data across network with the 350Mhz versus 100Mhz of Cat5, coupled with other more stringent specifications, Cat5e is ideal for networks which plan to operate at Gigabit Ethernet speeds. If you are creating a new network or upgrading an existing one, it is recommended that you go with Cat5e network cable, or newer cable technologies like CAT6 and CAT7, because although Cat5 is falling further and further behind ever-advancing cabling performance standards, while the small increase in price of Cat5e over Cat5 is more than made up for by "future proofing" your network's cabling infrastructure.