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14 CHAPTER 1: SYSTEM DESCRIPTION
X.21 DCE cable pinouts
(60-pin connector) to
DB-15 female
Signal Pin # on Pin # on Direction
Name 60-pin DB-15 (for QSIM)
Frame GND 46 1
Circuit GND 15 8
RTS 1,2 3,10 IN
CTS 9,10 5,12 OUT
DSR OUT
DCD (not used; tristate when in DTE mode)
DTR IN
LL (not used) IN
SD+ 28 2 IN
SD- 27 9 IN
RD+ 11 4 OUT
RD- 12 11 OUT
SCTE+ IN
SCTE- IN
SCR+ 24 6 OUT
SCR- 23 13 OUT
(tristate SCR + and - when in DTE mode,
double term., double buffer)
SCT+ OUT
SCT- OUT
Shorting
GR 1 47,48
Shorting
GR 2 51, 52
(continued)
Table 4 PathBuilder S330 System Speciļ¬cations