Exam 220-1101 topic 1 question 188 discussion

Key Points: Consistency is Key: The most important thing is to use the same standard on both ends of a cable. If one end is wired according to T568A, the other end should also be wired according to T568A. Similarly, if one end is wired according to T568B, the other end should also be wired according to T568B. Common Practice: T568B is the more commonly used standard, especially for Ethernet cabling. Straight-Through and Crossover Cables: The choice of standard can be used to create different types of cables: Straight-through cable: Both ends are wired the same (either both T568A or both T568B). Crossover cable: One end is wired according to T568A, and the other end is wired according to T568B. Flexibility: Both standards are functionally equivalent, so the choice between them is often a matter of preference or specific network requirements. By understanding the differences between T568A and T568B and following consistent wiring practices, you can ensure reliable network connectivity. GG

The only difference between T568A and T568B is that the orange and green pairs are interchanged. T568A wiring pattern is recognized as the preferred wiring pattern for this standard because it provides backward compatibility to both one pair and two pair USOC wiring schemes.

The pair-to-pin assignments are different in the T568B and T568A wiring schemes. This difference is easily seen with pin positioning. The green and orange pairs (2 and 3) are switched. Patch cords can be purchased that are pre-wired for T568B or 568A connectivity. https://www.comms-express.com/infozone/article/t568a-and-t568b/#:~:text=T568A%20and%20T568B%20are%20the,EIA%2D568%20telecommunications%20cabling%20standards.