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Appendix B - Hardware Specifications 119
Cyclades-PR1000
The X.21 Modem Cable
Pin #
1
2
4
6
7
9
11
15
17
19
22
24
Cyclades-PR1000
(DB25)
X.21 Equipament
(DB15)
Signal
CGND
CLK-
IND-
RxD-
GND
CTL-
TxD-
CLK+
IND+
RxD+
CTL+
TxD+
Signal
CGND
CLK-
IND-
RxD-
GND
CTL-
TxD-
CLK+
IND+
RxD+
CTL+
TxD+
Pin #
1
6
5
4
8
3
2
13
12
11
10
9
FIGURE B.6 X.21 MODEM CABLE - DB-25 MALE TO DB-15 MALE