3Com SuperStack II PathBuilder S330 Reference Manual page 35

Table 5 PathBuilder S310 System Specifications
X.21 DCE cable pinouts
(60-pin connector) to
DB-15 female
(continued)
Signal Pin # on
Name 60-pin
Frame GND 46
Circuit GND 15
RTS 1,2
CTS 9,10
DSR
DCD (not used; tristate when in DTE mode)
DTR
LL (not used)
SD+ 28
SD- 27
RD+ 11
RD- 12
SCTE+
SCTE-
SCR+ 24
SCR- 23
(tristate SCR + and - when in DTE mode,
double term., double buffer)
SCT+
SCT-
Shorting
GR 1 47,48
Shorting
GR 2 51, 52
Specifications 23
Pin # on Direction
DB-15 (for QSIM)
1
8
3,10 IN
5,12 OUT
OUT
IN
IN
2 IN
9 IN
4 OUT
11 OUT
IN
IN
6 OUT
13 OUT
OUT
OUT