
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
3000 server does not support a keyboard attached to
the system USB port.
The Netfinity 3000 server comes with two USB ports.
Table 10 shows the pin-number assignments for the USB
port connectors.
Table 10. USB Port Connector Pin-Number Assignments
Pin
Signal
1
VCC
2
−
Data
3
+
Data
4
Ground
158
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