3com 4250T Manual De Usuario
68
A
PPENDIX
B: P
IN
-
OUTS
Modem Cable
9-pin to RS-232 25-pin
RJ-45 Pin
Assignments
Assignments
Pin assignments for ports configured as MDI and MDIX are given in
and
.
Table 10 Pin assignments
Screen
TxD
RxD
RTS
CTS
DSR
DSR
Ground
DCD
DTR
Screen
TxD
RxD
RTS
CTS
DSR
DSR
Ground
DCD
DTR
Shell
3
2
7
8
6
6
5
1
4
1
2
3
4
5
5
6
7
8
20
Switch 4200
Cable connector: 9-pin female
Cable connector: 9-pin 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-
DUA1730-0AAA04.book Page 68 Thursday, November 17, 2005 2:59 PM