Modem Cable; Pin Assignments - 3Com SuperStack 3 Switch 4400 Series Getting Started Manual

70 A B: P
PPENDIX IN

Modem Cable

RJ-45 Pin
Assignments
-
OUTS
9-pin to RS-232 25-pin
Pin assignments are identical for 10BASE-TX and 100BASE-T RJ-45
connectors.
Table 10 Pin assignments
Pin Number
Ports configured as MDI
1
2
3
4
5
6
7
8
Signal
Transmit Data +
Transmit Data +
Receive Data +
Not assigned
Not assigned
Receive Data –
Not assigned
Not assigned
Function
Bidirectional Data A+
Bidirectional Data A-
Bidirectional Data B+
Bidirectional Data C+
Bidirectional Data C-
Bidirectional Data B-
Bidirectional Data D+
Bidirectional Data D-