Nortel Enterprise 1000 Reference Manual page 209

Table 58
Jumper settings
Jumper
Port
location
0 J10
1 J7
J6
2 J5
3 J4
J3
Succession Communication Server for Enterprise 1000 Circuit Card Reference Guide
Two ports offer the option for DTE/DCE configuration. This option is
selected from a jumper on the card. Table 58 shows the jumper settings.
Strap for
DTE
C - B
C - B
C - B
C - B
C - B
C - B
NTAK02 SDI/DCH card
Strap for Jumper
DCE location
B - A
B - A J9
B - A J8
B - A
B - A J2
B - A J1
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RS422 RS232
C - B B - A
C - B B - A
C - B B - A
C - B B - A