3com 4400 PWR User Manual
74
A
PPENDIX
B: P
IN
-
OUTS
Modem Cable
9-pin to RS-232 25-pin
RJ-45 Pin
Assignments
Assignments
Pin assignments are identical for 10BASE-TX and 100BASE-T RJ-45
connectors.
connectors.
Table 10 Pin assignments
Pin Number
Signal
Function
Ports configured as MDI
1
Transmit Data +
Bidirectional Data A+
2
Transmit Data +
Bidirectional Data A-
3
Receive Data +
Bidirectional Data B+
4
Not assigned
Bidirectional Data C+
5
Not assigned
Bidirectional Data C-
6
Receive Data –
Bidirectional Data B-
7
Not assigned
Bidirectional Data D+
8
Not assigned
Bidirectional Data D-
DUA1720-3AAA07.book Page 74 Wednesday, March 17, 2004 1:14 PM