Modem Cable; Ethernet Port Rj-45 Pin Assignments - 3Com 5500-EI Getting Started Manual

124 A B: P -
PPENDIX IN OUTS

Modem Cable

Ethernet Port RJ-45
Pin Assignments
RJ-45 to RS-232 25-pin
Switch 5500
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 10/100
Ports configured as MDI
1 Transmit Data +
2 Transmit Data –
3 Receive Data +
4 Not assigned
5 Not assigned
6 Receive Data –
7 Not assigned
8 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-