Sun Microsystems Fire 880, Руководство пользователя

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80 Sun Fire 880 Server Owner’s Guide • August 2001
About the USB Ports
The system’s rear panel provides two Universal Serial Bus (USB) ports for
connection to USB peripheral devices such as:
■
Sun Type 6 USB keyboard
■
Sun USB three-button mouse
■
Modems
■
Printers
■
Scanners
■
Digital cameras
For USB port locations, see “Locating Rear Panel Features” on page 8.
Note – For Sun Fire 880 servers, you must order the keyboard and mouse as
options. If the version of your Sun Type 6 keyboard does not have an integrated USB
hub, the keyboard and mouse will consume both USB ports on the system rear
panel. If you need to connect additional USB devices, you must add a USB hub.
The USB ports are compliant with the Open Host Controller Interface (Open HCI)
specification for USB Revision 1.0. Both ports support isochronous and
asynchronous modes and enable data transmission at speeds of 1.5 Mbps and 12
Mbps. Note that the USB data transmission speed is significantly faster than that of
the standard serial ports, which operate at a maximum rate of 460 Kbaud.
The USB ports are accessible by connecting a USB cable to either rear panel USB
connector. The connectors at each end of a USB cable are different, so you cannot
connect them incorrectly. One connector plugs in to the system or USB hub; the other
plugs in to the peripheral device. Up to 126 USB devices can be connected to the bus
simultaneously, through the use of USB hubs.
Note –
The Universal Serial Bus provides power for smaller USB devices such as
modems. Larger USB devices, such as scanners, require their own power source.
Both USB ports support hot-plugging. You can connect and disconnect the USB cable
and peripheral devices while the system is running, without affecting system
operations.
Note – You can only perform USB hot-plug operations while the operating system is
running. USB hot-plug operations are not supported when the system
ok
prompt is
displayed.