What is the main difference in wiring colors between the T568A and T568B standards?

The primary difference between the T568A and T568B wiring standards lies in the arrangement of the color-coded pairs used for terminating the wires. Specifically, the T568A standard uses the green pair for the first pair of pins, while the T568B standard uses the orange pair for the same purpose. This results in the orange and green pairs being interchanged between the two standards.

In T568A, the pinout sequence starts with the white-green and green pair as the first pair, followed by the white-orange and orange pair. In contrast, T568B reverses that order, placing the white-orange and orange pair first, and then the white-green and green pair. This means that, depending on which standard is applied, the color coding of the cabling could significantly affect network compatibility and performance.

The other options incorrectly suggest variations that aren't present since blue and brown pairs follow the same ordering in both standards, and there are no red and yellow pairs defined within the T568 standards. Therefore, understanding this difference is crucial for ensuring proper wiring layout and maintaining network standards during installations or troubleshooting.