What pins do Switch transmitters use?

Switch transmitters in Ethernet networks typically use the pair of wires connected to pins 3 and 6 for transmission in 100BASE-TX and 1000BASE-T (Gigabit Ethernet) configurations. This is based on the TIA/EIA-568 standard for wiring twisted pair cables.

In 100BASE-TX operation, only two pairs of wires are utilized: one pair for transmitting data and another for receiving data. Specifically, pins 1 and 2 are used for transmitting data from one device to another, while pins 3 and 6 are used for receiving. For Gigabit Ethernet (1000BASE-T), all four pairs are used simultaneously for both transmitting and receiving data, but the original classification still applies that pins 3 and 6 are among the ones used for the transmit path.

Therefore, when considering the context of switch transmitters, it can be understood that the correct answer correctly reflects the industry standard and practice for Ethernet wiring and port functionality.