T568a vs T568b: Which To Use
There are two schemes: T568A and T568B. From a practical standpoint, they perform and function identically in a modern data network. Just be sure you are using the same color scheme at both ends of your cable and you will stay out of trouble.
T568A and T568B are the termination standards used by Internet backbone infrastructure, Internet providers and all the way down to homeowners or businesses. The only real difference between these two pin-to-pair assignments are the green and orange pairs. These two sets are swapped in the cable. Even though these are switched, they are still both effectively direct or “straight through” connections.
As of 2018, ANSI/TIA still recommends T568A for residential installations for plug-in backward compatibility with old technology like fax machines or a plug-in base station for wireless phone handsets. If you are not using any such devices, or have no intention of plugging ancient RJ11 plugs into RJ45 wall jacks like you would a “phone jack”, then it comes back to personal preference again.
…another common misconception is that one wiring scheme will perform better than the other. Let me put this to bed immediately: they are identical in regards to performance.
we may need to connect a computer directly to another computer or a host-to-host connection. As an example, we need to copy data from one computer to another, but the two computers don’t have access to a switch for help with this process. These two computers need to use a crossover cable.