90APPENDIX B: PIN-OUTS

Modem Cable

RJ-45 to RS-232 25-pin

 

 

 

3Com Switch

RS-232 Modem Port

 

Cable connector: RJ-45 female

Cable connector: 25-pin male

 

Screen

Shell

1

Screen

 

TxD

3

2

TxD

 

RxD

2

3

RxD

 

RTS

7

4

RT S

 

CTS

8

5

CTS

 

DSR

6

6

DSR

 

Ground

5

7

Ground

 

DCD

1

8

DCD

 

DTR

4

20

DTR

Ethernet Port RJ-45 Pin Assignments

10/100 and 1000BASE-T RJ-45 connections.

Table 10 Pin assignments

Pin Number

10/100

1000

 

 

 

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-

 

 

Table 11 Pin assignments

 

 

 

 

Pin Number

10/100

1000

 

 

Ports configured as MDIX

 

1

Receive Data +

Bidirectional Data B+

2

Receive Data -

Bidirectional Data B-

Page 90
Image 90
3Com 3CR17662-91 Ethernet Port RJ-45 Pin Assignments, 10/100 and 1000BASE-T RJ-45 connections, Pin Number 10/100 1000