What distinguishes the wiring colors in the T568A and T568B standards?

What distinguishes the wiring colors in the T568A and T568B standards?

• A. Only the blue pair differs
• B. The order of orange and green pairs is interchanged
• C. Both standards use the same color codes
• D. The brown pair is only used in T568B

Answer: (B)

The T568A and T568B wiring standards are both used for terminating twisted pair Ethernet cabling, such as Category 5e or Category 6 cables. The primary distinction between these two standards is indeed the order of the colored wire pairs.

In T568A, the wiring sequence places the green pair before the orange pair, whereas in T568B, the orange pair comes first. This interchange of the orange and green pairs is crucial because it affects how the cables are connected in network applications, ensuring compatibility with existing installations and equipment.

The other choices present some misunderstandings about the standards. For instance, both T568A and T568B use the same color codes for the blue and brown pairs, and there is no exclusive use of the brown pair in T568B. Additionally, the notion that only the blue pair differs is incorrect, as the blue pair remains consistent in both standards, with the main variation residing in the arrangement of the orange and green pairs. This critical difference is what makes option B the correct choice.