What are the two standards for cable termination?
The Telecommunications Industry Association (TIA/EIA-568 standard) says that T568A and T568B are the two most used standards for cable termination in twisted-pair Ethernet cabling. When connecting an eight-conductor twisted-pair cable (usually Cat5e, Cat6, or Cat6a) to an RJ45 connector or jack, these standards spell out the exact pinout, or the order of the wire connections.
Both standards make sure that network devices can talk to each other and work together, but the main difference is how the green and orange cable pairs are set up.
In this setup, the green pair goes on pins 1 and 2, and the orange pair goes on pins 3 and 6. The U.S. government first suggested T568A, and it is still the best choice for homes.
T568B: The orange pair is on pins 1 and 2, and the green pair is on pins 3 and 6. T568B became more popular in business networks, especially in the US, because it was compatible with older AT&T 258A color codes.
Both standards work the same way as long as the same scheme is utilized at both ends of the cable. If you mix them on purpose (one end T568A and the other T568B), you get a crossover cable. This type of cable was originally used to connect devices directly to each other before auto-MDI/MDIX became prevalent.
For uniformity, companies use one standard across all of their installations. T568B is more common these days, although T568A is still acceptable and up to date. The right way to conclude a project relies on the project’s requirements, the infrastructure that is already in place, and regional preferences.