Emulex DCP_link - Manual (Page 32)

2-18 Chapter 2
8-Port RS-422/X.21 Daughterboard
This section provides configuration and installation instructions for the eight
port RS-422/X.21 Each serial port may be individually configured as either
DTE or DCE with the aid of null-modem cables. All ports support RS-422A.
Setting DTE or DCE Operation
NOTE: Throughout this document, DCE refers to internal
clocking and DTE refers to external clocking.
J1
SW2 SW1
J3
SW3 SW4 J2
Figure 2-17 Switch Locations on the 8-Port RS-422/X.21 Daughterboard