3Com 3CBLSG24PWR User Guide - Page 222
Modem Cable, Ethernet Port RJ-45 Pin Assignments, RJ-45 to RS-232 25-pin
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222 APPENDIX C: PIN-OUTS Modem Cable RJ-45 to RS-232 25-pin Switch 5500 Cable connector: RJ-45 female Screen Shell TxD 3 RxD 2 RTS 7 CTS 8 DSR 6 Ground 5 DCD 1 DTR 4 RS-232 Modem Port Cable connector: 25-pin male 1 Screen 2 TxD 3 RxD 4 RTS 5 CTS 6 DSR 7 Ground 8 DCD 20 DTR Ethernet Port RJ-45 Pin Assignments 10/100 and 1000BASE-T RJ-45 connections. Table 10 Pin assignments Pin Number 10/100 Ports configured as MDI 1 Transmit Data + 2 Transmit Data − 3 Receive Data + 4 Not assigned 5 Not assigned 6 Receive Data − 7 Not assigned 8 Not assigned 1000 Bidirectional Data A+ Bidirectional Data A− Bidirectional Data B+ Bidirectional Data C+ Bidirectional Data C− Bidirectional Data B− Bidirectional Data D+ Bidirectional Data D−
222
A
PPENDIX
C: P
IN
-O
UTS
Modem Cable
RJ-45 to RS-232 25-pin
Ethernet Port RJ-45
Pin Assignments
10/100 and 1000BASE-T RJ-45 connections.
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
Cable connector: RJ-45 female
RS-232 Modem Port
Cable connector: 25-pin male
Pin Number
10/100
1000
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
−