when you are crimping a typical network cable , there are two types of wiring methods you can follow . The straight through and cross over . If you are connecting two dissimilar devices together , you are using the straight through cable and if you are connecting two similar devices you are using a cross over cable . But why should I care about those stupid color codes mentioned on the networking textbooks ? like white-orange , orange , white blue -blue …and so so on !! , why is it so , do the signals are aware about the color of the plastic which envelop the conductors ?
Let us look in to the matter from a layman’s and technologist perspective ,
first of all from a layman’s view point , It does not hurt to implement a common standard for network color coding so that if everyone of us follows the same pattern when crimping a network cable , we do not have to waste our time to figure out what will be the pattern of conductors on the other end of the cable when we have to re-crimp an RJ-45 jack as part of a troubleshooting procedure .
This is the standard color pattern used by professionals for straight through cabling and it is called 568 B standard for CAT-5 cabling
What normally confuses a professional is the swapping of colors on 3,4 ,5 ,6 conductors . In the old times of 10 MBps networks , people did not cared much about the cabling patterns like 568B and they cared only about the pairs of wires coming closer . But when our networks moved to 100 and then 1000 Mbps , we become aware that this conductor layout does not work with the new standards and we will get low speeds and performance if we do not follow the 568 B standards in which the pair positions are swapped .
This has more to do with reducing the electro -magnetic inductance and cross talk associated with the wires which carry the electro- magnetic waves ,
For those who wish to dive deep in to the physics behind it , please download this article which will discuss all the dirty details about why the color coding is important for ensuring maximum performance