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82 Sun Enterprise 220R Server Owner’s Guide • October 1999
About Serial Port Jumpers
The serial port jumpers on the main logic board (J2604 and J2605) permit the
configuration of 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.
Configuring jumpers can only be performed by a qualified service provider. For
information about configuring the jumpers, about the locations of the serial port
jumpers on the main logic board, and about configuration instructions, see the Sun
Enterprise 220R Server Service Manual.
For information about how jumpers are marked on the main logic board with
jumper addresses, see “About the Main Logic Board Jumpers” on page 81.