Which pins does a PC use to transmit data in a FastEthernet connection?

In a FastEthernet connection, typically using an RJ-45 connector, a PC transmits data over pins 1 and 2. These pins are specifically designed for the transmission of data signals in 10BASE-T and 100BASE-TX Ethernet standards. In these standards, pin 1 transmits data as positive voltage while pin 2 transmits data as a negative voltage. This structure allows the device to communicate effectively over the FastEthernet network.

Understanding the pin configuration is crucial for troubleshooting and designing network connections because it ensures that data is sent and received correctly. The other options—pins 3 and 6, 7 and 8, 4 and 5—are not used for transmitting data in this context. Instead, pins 3 and 6 are used for receiving data, while pins 7 and 8, and 4 and 5 are typically not involved in the standard Ethernet data transmission pathways.