IBM 847651U Handbook - Page 176

Connecting external options Universal serial bus (USB) ports The universal serial bus (USB) is an emerging serial interface standard for telephony and multimedia devices. Each USB port is a single connector for devices that previously used serial, parallel, keyboard, mouse, and game ports. USB technology uses Plug and Play to determine which type of device has been attached to the connector. Each USB device is accessed by a unique USB address. A device called a hub is used to convert a single USB connector into multiple attachment points. A hub has multiple ports where peripherals can be attached. USB provides 12 megabits-per-second (Mbps) bandwidth with a maximum of 63 peripherals and a maximum signal distance of five meters per segment. Note: If more than one USB device is to be attached, the device must be connected to a hub. Your Netfinity 3000 server does not support a keyboard attached to the system USB port. Your Netfinity 3000 server comes with two USB ports. Table 9 shows the pin-number assignments for the USB port connectors. Table 9. USB port connector pin-number assignments Pin Signal 1 VCC 2 −Data 3 +Data 4 Ground 142 Netfinity 3000 User's Handbook