Chapter 3 Hardware Configuration 69
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.
About Hardware Jumpers
The hardware jumpers in the Sun Fire V890 server have the following functions:
■ J2902 and J2903 on the system I/O board are used to configure the serial ports for
either EIA-423 or EIA-232D operation. For information about the EIA-423 and
EIA-232D jumper settings, see “” on page 71.
■ J3002, J3003, and J3004 are used to affect the operation of the OpenBoot flash
PROM located on the system I/O board. See “About Flash PROM Jumpers” on
page 72.
■ J01701, J01003, and J0803 are used to affect the operation of the flash PROM
located on the FC-AL disk backplane. See “About Flash PROM Jumpers” on
page 72.
Caution – All internal jumper modifications must be performed only by qualified
service personnel.
Caution – Do not change the configuration of J0501 and J0502 on the system
controller card from the default settings; otherwise, the system controller card will
not boot.
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