Modem Cable; Ethernet Port Rj-45 Pin Assignments - 3Com 2924-PWR User Manual

222 A C: P
PPENDIX IN

Modem Cable

Ethernet Port RJ-45
Pin Assignments
-O
UTS
RJ-45 to RS-232 25-pin
Switch 5500
Cable connector: RJ-45 female
Screen
TxD
RxD
RTS
CTS
DSR
Ground
DCD
DTR
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
Shell
3
2
7
8
6
5
1
4
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
7 Ground
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−