Technical information

Universal Serial Bus 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. The Netfinity
3500 server does not support a keyboard attached to
the system USB port.
The Netfinity 3500 server comes with two USB ports.
Table 11 shows the pin-number assignments for the USB
port connectors.
Table 11. USB Port Connector Pin-Number Assignments
Pin Signal
1 VCC
2 −Data
3 +Data
4 Ground
IBM Netfinity 3500 - Type 8644 103