3com 3CR17451-91 Manual De Usuario
70
A
PPENDIX
B: P
IN
-
OUTS
Modem Cable
RJ-45 to RS-232 25-pin
RJ-45 Pin
Assignments
Assignments
Pin assignments are identical for 10/100 and 1000 RJ-45 connectors.
Table 10 Pin assignments
Screen
TxD
RxD
RTS
CTS
DSR
Ground
DCD
DTR
RxD
RTS
CTS
DSR
Ground
DCD
DTR
Screen
TxD
RxD
RTS
CTS
DSR
Ground
DCD
DTR
RxD
RTS
CTS
DSR
Ground
DCD
DTR
Shell
3
2
7
8
6
5
1
4
2
7
8
6
5
1
4
1
2
3
4
5
6
7
8
20
2
3
4
5
6
7
8
20
Switch 3870
Cable connector: RJ-45 female
Cable connector: RJ-45 female
RS-232 Modem Port
Cable connector: 25-pin male
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-
DUA1745-0AAA03.book Page 70 Friday, April 8, 2005 12:34 PM