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A-4 ASMi-450 Installation and Operation Manual
A.3 X.21 DCE Connector
When the ASMi-450 is ordered with an X.21 interface, the physical interface is
a 15-pin female D-type connector wired in accordance with Table A-4.
Table A-4. DCE Connector, X.21 Interface
Pin Designation Direction Function
1 FG
↔
Frame Ground
2 TA To ASMi-450 Transmit Data - wire A
3 CA To ASMi-450 Control - wire A
4 RA From ASMi-450 Receive Data - wire A
5 IA From ASMi-450 Indication Data - wire A
6 SA From ASMi-450 Signal Timing - wire A
7 BA To ASMi-450 External Timing - wire A
8 G
↔
Signal Ground
9 TB To ASMi-450 Transmit Data - wire B
10 CB To ASMi-450 Control - wire B
11 RB From ASMi-450 Receive Data - wire B
12 IB From ASMi-450 Indication Data - wire B
13 SB From ASMi-450 Signal Timing - wire B
14 BB To ASMi-450 External Timing - wire B
15 – N/A Not Connected