Modem Cable; Ethernet Port Rj-45 Pin Assignments - 3Com Switch 4210 Series Getting Started

72 C A: P -
HAPTER 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
6
DSR
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 10/100
Ports configured as MDIX
1 Receive Data +
Receive Data −
2
3 Transmit Data +
4 Not assigned
5 Not assigned
Transmit Data −
6
7 Not assigned
8 Not assigned
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
Screen
TxD
RxD
RTS
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−
Bidirectional Data A+
Bidirectional Data A−
Bidirectional Data D+
Bidirectional Data D−
Bidirectional Data C+
Bidirectional Data C−