3Com 4924 Getting Started Guide - Page 70
Modem Cable, RJ-45 Pin Assignments, pin to RS-232 25-pin
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70 APPENDIX B: PIN-OUTS Modem Cable 9-pin to RS-232 25-pin RJ-45 Pin Assignments Pin assignments are identical for 10/100BASE-T and 1000BASE-T RJ-45 connectors. Table 10 Pin assignments Pin Number 10/100BASE-T 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 1000BASE-T Bidirectional Data A+ Bidirectional Data ABidirectional Data B+ Bidirectional Data C+ Bidirectional Data CBidirectional Data BBidirectional Data D+ Bidirectional Data D-
70
A
PPENDIX
B: P
IN
-
OUTS
Modem Cable
9-pin to RS-232 25-pin
RJ-45 Pin
Assignments
Pin assignments are identical for 10/100BASE-T and 1000BASE-T RJ-45
connectors.
Table 10
Pin assignments
Pin Number
10/100BASE-T
1000BASE-T
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-