Emulex DCP_link - Manual (Page 21)

Hardware Configuration 2-7
Figure 2-5 shows the factory default options for the standard adapter
configuration. The factory default setting, as shown, calls for jumper blocks
to be in place on each jumper, thus enabling each option:
Figure 2-5 Factory Default Jumper Block Placement
Figure 2-6 - Jumper Block J1 Options
Software Compatibility Level
Jumper J1:1-2 selects the software compatibility level of the DCP286i-SBC.
In the factory default (jumper connected), an application program is able to
detect that the board is a DCP286i and can take advantage of features not
available in the original DCP286.