44 APPENDIX B: PIN-OUTS
Modem Cable 9-pin to RS-232 25-pin
RJ45 Pin
Assignments
Pin assignments are identical for 10BASE-T and 100BASE-TX RJ45
connectors
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 3300
Cable connector: 9-pin female
XM, SM, TM, MM
RS-232 Modem Port
Cable connector: 25-pin male
Ta bl e 7
Pin assignments
Pin Number Signal Function
Ports configured as MDI
1 TxData + Transmit data
2 TxData – Transmit data
3 RxData + Receive Data
4 Not assigned
5 Not assigned
6 RxData – Receive data
7 Not assigned
8 Not assigned
1697ua.bk Page 44 Monday, December 3, 2001 11:31 AM
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