42APPENDIX B: PIN-OUTS

Modem Cable

9-pin to RS-232 25-pin

 

 

 

Switch 3300 SM

RS-232 Modem Port

 

Cable connector: 9-pin female

Cable connector: 25-pin male

 

Screen

Shell

1

Screen

 

TxD

3

2

TxD

 

RxD

2

3

RxD

 

RTS

7

4

RTS

 

CTS

8

5

CTS

 

DSR

6

6

DSR

 

Ground

5

7

Ground

 

DCD

1

8

DCD

 

DTR

4

20

DTR

RJ45 Pin

Pin assignments are identical for 10BASE-T and 100BASE-TX RJ45

Assignments

connectors

 

Table 7 Pin assignments

Pin Number

Signal

Function

 

 

 

Ports configured as MDI

 

 

1

TxData +

Transmit data

2

TxData –

Transmit data

3

RxData +

Receive Data

4

Not assigned

 

5

Not assigned

 

6

RxData –

Receive data

7

Not assigned

 

8

Not assigned

 

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Image 42
3Com 3C16987 manual Modem Cable, RJ45 Pin, Assignments, Connectors, Pin Number Signal Function