Modem Cable; Rj45 Pin Assignments - 3Com SuperStack 3 Switch 3300 XM User Manual

44 A B: P
PPENDIX IN

Modem Cable

RJ45 Pin
Assignments
-
OUTS
9-pin to RS-232 25-pin
Switch 3300 XM, SM, TM, MM
Cable connector: 9-pin female
Screen Shell
TxD 3
RxD 2
RTS 7
CTS 8
6
DSR
Ground 5
DCD 1
DTR 4
Pin assignments are identical for 10BASE-T and 100BASE-TX RJ45
connectors
Table 7 Pin assignments
Pin Number
Ports configured as MDI
1
2
3
4
5
6
7
8
RS-232 Modem Port
Cable connector: 25-pin male
1
2
3
4
5
6
7
8
20
Signal
TxData +
TxData –
RxData +
Not assigned
Not assigned
RxData –
Not assigned
Not assigned
Screen
TxD
RxD
RTS
CTS
DSR
Ground
DCD
DTR
Function
Transmit data
Transmit data
Receive Data
Receive data