3com 3C17300 Owner's Manual Page 68

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68 APPENDIX B: PIN-OUTS
Modem Cable 9-pin to RS-232 25-pin
RJ-45 Pin
Assignments
Pin assignments are identical for 10BASE-TX and 100BASE-T RJ-45
connectors.
Table 10 Pin assignments
Screen
TxD
RxD
RTS
CTS
DSR
Ground
DCD
DTR
Screen
TxD
RxD
RTS
CTS
DSR
Ground
DCD
DTR
Shell
3
2
7
8
6
5
1
4
1
2
3
4
5
6
7
8
20
Switch 4200
Cable connector: 9-pin female
RS-232 Modem Port
Cable connector: 25-pin male
Pin Number Signal Function
Ports configured as MDI
1 Transmit Data + Bidirectional Data A+
2 Transmit Data + Bidirectional Data A-
3 Receive Data + Bidirectional Data B+
4 Not assigned Bidirectional Data C+
5 Not assigned Bidirectional Data C-
6 Receive Data – Bidirectional Data B-
7 Not assigned Bidirectional Data D+
8 Not assigned Bidirectional Data D-
DUA1730-0AAA02.book Page 68 Thursday, January 23, 2003 12:28 PM
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