About Serial Port Jumpers - Sun Microsystems Fire V890 Service Manual

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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.

Shunt on Pins 1 + 2 Selects

Shunt on Pins 2 + 3 Selects

Chapter 7 Hardware Configuration

Default Setting