Ethernet Port
The 15-inch PowerBook G4 has a built-in Ethernet port that supports 10BASE-T, 100BASE-T, and 1000BASE-T transfer rates. In operation, the actual speed of the link is auto-negotiated between the computer’s PHY device and the network hub or switch to which it is connected.
The connector for the Ethernet port is an RJ-45 connector on the right side of the computer. Table 3-4 shows the signals and pin assignments for 10BASE-T and 100BASE-T operation. Table 3-5 shows the signals and pin assignments for 1000BASE-T operation.
Pin |
Signal name |
Signal definition |
|---|---|---|
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 |
Pin |
Signal name |
Signal definition |
|---|---|---|
1 |
TRD+(0) |
Transmit and receive data 0 (positive lead) |
2 |
TRD–(0) |
Transmit and receive data 0 (negative lead) |
3 |
TRD+(1) |
Transmit and receive data 1 (positive lead) |
4 |
TRD+(2) |
Transmit and receive data 2 (positive lead) |
5 |
TRD–(2) |
Transmit and receive data 2 (negative lead) |
6 |
TRD–(1) |
Transmit and receive data 1 (negative lead) |
7 |
TRD+(3) |
Transmit and receive data 3 (positive lead) |
8 |
TRD–(3) |
Transmit and receive data 3 (negative lead) |
To interconnect two computers for 1000BASE-T operation, you must use 4-pair cable (Category 5 or 6).
The Ethernet port on the 15-inch PowerBook G4 supports Auto-MDIX: It switches between MDI (Medium Dependent Interface) and MDI-X operation automatically, so it can be connected to another device by either a straight-through cable or a cross-over cable.
The Ethernet interface in the 15-inch PowerBook G4 conforms to the ISO/IEC 802.3 specification, where applicable, and complies with IEEE specifications 802.3i (10BASE-T), 802.3u-1995 (100BASE-T), and 802.3ab (1000BASE-T).
Last updated: 2005-10-27
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