3Com 4250T Getting Started Guide - Page 68
Modem Cable, RJ-45 Pin Assignments, pin to RS-232 25-pin
UPC - 662705440347
View all 3Com 4250T manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 68 highlights
68 APPENDIX B: PIN-OUTS Modem Cable RJ-45 Pin Assignments 9-pin to RS-232 25-pin Switch 4200 Cable connector: 9-pin female Screen Shell TxD 3 RxD 2 RTS 7 CTS 8 DSR 6 Ground 5 DCD 1 DTR 4 RS-232 Modem Port Cable connector: 25-pin male 1 Screen 2 TxD 3 RxD 4 RTS 5 CTS 6 DSR 7 Ground 8 DCD 20 DTR Pin assignments are identical for 10BASE-TX and 100BASE-T RJ-45 connectors. Table 10 Pin assignments Pin Number Signal 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 Function Bidirectional Data A+ Bidirectional Data ABidirectional Data B+ Bidirectional Data C+ Bidirectional Data CBidirectional Data BBidirectional Data D+ Bidirectional Data D-
68
A
PPENDIX
B: P
IN
-
OUTS
Modem Cable
9-pin to RS-232 25-pin
RJ-45 Pin
Assignments
Pin assignments are identical for 10BASE-TX and 100BASE-T RJ-45
connectors.
Table 10
Pin assignments
Screen
TxD
RxD
RTS
CTS
DSR
Ground
DCD
DTR
Screen
TxD
RxD
RTS
CTS
DSR
Ground
DCD
DTR
Shell
3
2
7
8
6
5
1
4
1
2
3
4
5
6
7
8
20
Switch 4200
Cable connector: 9-pin female
RS-232 Modem Port
Cable connector: 25-pin male
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-