Modem Cable; Ethernet Port Rj-45 Pin Assignments - 3Com 4200G Getting Started Manual

64 A A: P
PPENDIX IN

Modem Cable

Ethernet Port RJ-45
Pin Assignments
-
OUTS
RJ-45 to RS-232 25-pin
3Com Switch
Cable connector: RJ-45 female
Screen
Shell
TxD 3
RxD 2
RTS 7
CTS 8
DSR 6
Ground 5
DCD 1
DTR 4
10/100 and 1000BASE-T RJ-45 connections.
Table 10 Pin assignments
Pin Number
Ports configured as MDI
1
2
3
4
5
6
7
8
Table 11 Pin assignments
Pin Number
Ports configured as MDIX
1
2
RS-232 Modem Port
Cable connector: 25-pin male
1
2
3
4
5
6
7
8
20
10/100
Transmit Data +
Transmit Data –
Receive Data +
Not assigned
Not assigned
Receive Data –
Not assigned
Not assigned
10/100
Receive Data +
Receive Data -
Screen
TxD
RxD
RT S
CTS
DSR
Ground
DCD
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-
1000
Bidirectional Data B+
Bidirectional Data B-