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The PowerBook computer has a built-in 10/100 Mbps Ethernet port. The user can connect it to either a 10Base-T or a 100Base-TX hub; the port will automatically sense which type of hub is connected.
The connector for the Ethernet port is a short, shielded RJ-45 connector on the back of the computer. Table 3-3 shows the signals and pins on the connector.
Table 3-3 Signals on the Ethernet connector
| 1 | TXP | Transmit (positive lead) |
| 2 | TXN | Transmit (negative lead) |
| 3 | RXP | Receive (positive lead) |
| 4 | - | Not used |
| 5 | - | Not used |
| 6 | RXN | Receive (negative lead) |
| 7 | - | Not used |
| 8 | - | Not used |
The Ethernet interface in the PowerBook 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).