USB Connector

The USB port uses a USB Type A connector, which has four pins. Two of the pins are used for power and two for data. Figure 3-1 is an illustration of a Type A USB port. Table 3-1 shows the pin assignments.

Figure 3-1 USB Type A connector

Table 3-1 Pin assignments on the USB port

Pin

Signal name

Description

1

VCC

+5 VDC

2

D-

Data -

3

D+

Data +

4

GND

Ground

The iBook computer provides power for the USB ports at 5 V and up to 500 mA each.

Each USB port supports both low-speed and high-speed data transfers, at up to 1.5 Mbps and 12 Mbps, respectively. High-speed operation requires the use of shielded cables.

The Macintosh USB system software that comes with the iBook computer supports all four data transfer types defined in the USB specification.

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