3Com SuperStack II PathBuilder S330 Reference Manual page 61

Table 17 Connector Pinouts for X.21 DTE cable (60-pin Connector) to DB-15 Male
Pin # on 60-pin
Signal Name Connector
Frame GND 46
Circuit GND 15
RTS 9, 10
CTS 1, 2
DSR
DCD (not used, see
DCE cable)
DTR
LL (not used)
SD+ 11
SD- 12
RD+ 28
RD- 27
SCTE+
SCTE-
SCR+ 26
SCR- 25
SCT+
SCT-
Shorting GR 1 47, 48
Shorting GR 2 51, 52,
Installation Procedures
Pin # on DB-25 Direction (for
Connector Serial Port)
1
8
3, 10 Out
5, 12 In
In
In
Out
Out
2 Out
9 Out
4 In
11 In
Out
Out
6 In
13 In
In
In
49