RAD Data comm FCD-X21 Manuel d'installation Page 145

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Installation and Operation Manual Appendix A Pinouts
FCD-E1 Data Channel Connector A-9
X.21 Data Channel
The following sections provide information on the cables required to connect
user’s equipment to the X.21 channel in the various timing modes.
DCE Mode
This mode is used to connect to user’s equipment with X.21 DTE interface. The
X.21 cable coming from the user’s equipment is connected to the FCD-E1
CHANNEL connector through an adapter cable. The adapter cable (see Figure A-3)
is terminated in a 25-pin male D-type connector at the FCD-E1 side, and a 15-pin
female connector at the user’s side. A suitable cable, designated CBL-HS2/X/1, is
available from RAD.
Cable wiring is given in Table A-8.
Figure A-3. X.21 Adapter Cable for DCE Mode
Table A-8. Wiring of X.21 Adapter Cable for DCE Mode
FCD-E1 Side Designation Function User’s Side
1 FG Frame Ground 1
2 SDA Send Data (wire A) 2
3 RDA Receive Data (wire A) 4
4 RTSA RTS (wire A) 3
5 CTSA CTS (wire A)
6 DSRA DSR (wire A)
7 SG Signal Ground 8
8 DCDA DCD (wire A) 5
9 RCB Receive Clock (wire B)
10 DCDB DCD (wire B) 12
11 SCEB External Send Clock (wire B)
12 SCB Send Clock (wire B) 13
13 CTSB CTS (wire B)
14 SDB Send Data (wire B) 9
15 SCA Send Clock (wire A) 6
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