Specifications

Note: When connecting a Power Mac G5 computer directly to another computer without using an

Ethernet hub, a crossover cable is not required; circuits in the PHY detect the type of connection

and switch the signal configuration as required.

The connector for the Ethernet port is an RJ-45 connector on the back of the computer. Table 3-4 (page 37)

shows the signals and pin assignments for 10Base-T/UTP and 100Base-TX operation. Table 3-5 (page 37) shows

the signals and pin assignments for 1000Base-T operation.

Table 3-4 Signals for 10Base-T/UTP and 100Base-TX operation

Signal definitionSignal namePin

Transmit (positive lead)TXP1

Transmit (negative lead)TXN2

Receive (positive lead)RXP3

Not used–4

Not used–5

Receive (negative lead)RXN6

Not used–7

Not used–8

Table 3-5 Signals for 1000Base-T Gigabit operation

Signal definitionSignal namePin

Transmit and receive data 0 (positive lead)TRD+(0)1

Transmit and receive data 0 (negative lead)TRD–(0)2

Transmit and receive data 1 (positive lead)TRD+(1)3

Transmit and receive data 2 (positive lead)TRD+(2)4

Transmit and receive data 2 (negative lead)TRD–(2)5

Transmit and receive data 1 (negative lead)TRD–(1)6

Transmit and receive data 3 (positive lead)TRD+(3)7

Input and Output Devices

Ethernet Port