About The Usb Ports; Configuration Rules - Sun Microsystems Sun Fire V445 Server Administration Manual

About the USB Ports

The system front and back panels provide two external Universal Serial Bus (USB)
ports on two independent controllers to connect USB peripheral devices such as:
Sun Type-6 USB keyboard
Sun opto-mechanical three-button USB mouse
Modems
Printers
Scanners
Digital cameras
The USB ports are compliant with the Open Host Controller Interface (Open HCI)
specification for USB Revision 1.1 and also 2.0 compliant (EHCI) and capable of 480
Mbps as well as 12 Mbps and 1.5 Mbps. The 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 460.8 Kbaud.
The USB ports are accessible by connecting a USB cable to a back panel USB
connector. The connectors at each end of a USB cable are keyed so that you cannot
connect them incorrectly. One connector plugs in to the system or USB hub. The
other connector plugs in to the peripheral device. Up to 126 USB devices can be
connected to each controller simultaneously, through the use of USB hubs. The USB
ports provide power for smaller USB devices such as modems. Larger USB devices,
such as scanners, require their own power source.
For the USB port locations, see
"Locating Front Panel Features" on page
Connectors" on page

Configuration Rules

USB ports support hot-swapping. You can connect and disconnect the USB cable
and peripheral devices while the system is running, without issuing software
commands and without affecting system operations. However, you can only hot-
swap USB components while the OS is running.
Hot-swapping USB components is not supported when the system ok prompt is
displayed or before the OS boots.
You can connect up to 126 devices to each of the two USB controllers, for a total of
252 USB devices per system.
"Locating Back Panel Features" on page 16
9. Also see
239.
"Reference for the USB
Chapter 4 Configuring Hardware
and
95