Which four pin pairs are involved in 1000BASE-T or 10GBASE-T connections?

In 1000BASE-T and 10GBASE-T Ethernet standards, the physical layer uses all four pairs of wiring in a typical Category 5e or better cable to achieve the desired data rates. Specifically, for 1000BASE-T, each pair of wires is utilized for bi-directional transmission, enabling simultaneous sending and receiving of data.

The correct answer identifies the pin pairs used effectively: Pair 1-2, Pair 3-6, Pair 4-5, and Pair 7-8. In 1000BASE-T, the wiring scheme allows for a balanced load on each of the twisted pairs. Each of these pairs carries signals in both directions, increasing efficiency and maximizing the use of the available wiring.

For 10GBASE-T, which also relies on all four pairs, the pin assignments are designed to ensure high data integrity and reduce crosstalk. The pairs are utilized such that each contributes to the overall performance and throughput, which is why the choices that do not align with these pairings do not represent the method used in these standards.

Overall, the first choice correctly reflects the pin pair assignments that enable the full-duplex communication necessary for the transmission rates specified by both 1000BASE-T and