The Power Mac G4 computer has a built-in Ethernet port that supports 10 and 100 Mbps transfer rates. In operation, the actual speed of the link is auto-negotiated between the computer's PHY device and the network bridge or router to which it is connected.
The connector for the Ethernet port is an RJ-45 connector on the back of the computer. Table 3-3 shows the signals and pins on the connector.
The Ethernet interface in the Power Mac G4 computer conforms to the ISO/IEC 802.3 specification, where applicable, and complies with IEEE specifications 802.3i (10Base-T) and 802.3u-1995 (100Base-T).