Which color pair is not interchanged between T568A and T568B standards?

In the T568A and T568B wiring standards for Ethernet cables, the color pairs represent different twisted pair configurations for the same pin arrangement. The key distinction between the two standards lies in the arrangement of the color-coded wires.

The blue pair is consistent in both standards, remaining in the same position, which means that this color pair is not interchanged between T568A and T568B. This consistency is crucial for maintaining reliable network performance and ensuring that devices communicate effectively across the infrastructure.

On the other hand, the brown, orange, and green pairs have their positions interchanged in T568A and T568B. For instance, the orange pair is placed differently between the two standards, and the same goes for the green and brown pairs. Understanding the significance of these color designations is essential for technicians to ensure accurate and functional network setups. Thus, recognizing that the blue pair is the only one that remains unchanged helps to avoid confusion when wiring and troubleshooting Ethernet connections.