Modem Cable; Pin Assignments - 3Com SUPERSTACK 4226T Getting Started Manual

68 A B: P
PPENDIX IN

Modem Cable

RJ-45 Pin
Assignments
-
OUTS
9-pin to RS-232 25-pin
Switch 4200
Cable connector: 9-pin female
Screen
Shell
TxD 3
RxD 2
RTS 7
CTS 8
DSR 6
Ground 5
DCD 1
DTR 4
Pin assignments for ports configured as MDI and MDIX are given in
Table 10 and
Table 10 Pin assignments
Pin Number
Ports configured as MDI
1
2
3
4
5
6
7
8
Table 11.
10/100
Transmit Data +
Transmit Data -
Receive Data +
Not assigned
Not assigned
Receive Data –
Not assigned
Not assigned
RS-232 Modem Port
Cable connector: 25-pin male
1 Screen
2 TxD
3 RxD
4 RTS
5
CTS
DSR
6
Ground
7
8
DCD
20 DTR
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-