70 Sun Fire V890 Server Owner’s Guide • May 2004
All jumpers are marked with identification numbers. For example, the serial port
jumpers on the system I/O board are marked J2902 and J2903. Jumper pins are
located immediately adjacent to the identification number. The default jumper
positions are indicated with shaded regions. Pin 1 is marked with an asterisk (*) in
any of the positions shown below.
About Serial Port Jumpers
The serial port jumpers (J2902 and J2903) on the system I/O board configure the
system’s two serial ports for either EIA-423 or EIA-232D signal levels. EIA-423 levels
are the default standard for North American users. EIA-232D levels are required for
digital telecommunication in nations of the European Community.
Pins
Jumper number
J 2XXX
*
*
*
*
*
*
Asterisk indicates pin 1
Shaded region indicates
default jumper position
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