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T568B is a standard for the arrangement of wires within an Ethernet cable, specifically for unshielded twisted pair (UTP) cables. It is one of the two most commonly used standards for Ethernet cabling, the other being T568A. The T568B standard was developed by the Telecommunications Industry Association (TIA) and the Electronic Industries Alliance (EIA) as part of the TIA/EIA-568 standard.

In a T568B cable, the wires are arranged in the following order from left to right when looking at the connector from the end with the wires: white/orange, orange, white/green, blue, white/blue, green, white/brown, brown. This arrangement is different from the T568A standard, which has a different order of wires.

The T568B standard is often used in North America and some other regions, while T568A is more commonly used in Europe and other parts of the world. However, it is important to note that both standards are compatible with each other, meaning that a cable with one standard can be used with equipment that uses the other standard, although it may require the use of a crossover cable or an auto-MDIX feature.

The T568B standard is designed to minimize crosstalk, which is the interference between pairs of wires in a cable. This is achieved by twisting the pairs of wires together, which helps to cancel out the electromagnetic interference between them. The T568B standard also specifies the minimum amount of twist per pair, which is 10 twists per foot (3.3 twists per meter) for Category 5e and higher cables.

In summary, T568B is a standard for the arrangement of wires within an Ethernet cable, developed by the TIA and EIA. It is one of the two most commonly used standards for Ethernet cabling, and is compatible with the T568A standard. The T568B standard is designed to minimize crosstalk and is used in North America and some other regions.