Connectors and Cables 2-17

RS-232 to RS-232 DCE Cable

This straight-through cable connects the RS-232 port on a SuperStack II bridge/router to a standard RS-232 DCE device.

Figure 2-14 shows the pin assignments of the RS-232 cable.

To RS-232 port on bridge/router

 

To modem/TA or CSU/DSU

1

2

3

4

5

6

7

8

9

10

11 12

13

 

1

2

3

4

5

6

7

8

9

10

11 12

13

14 15

16

17

18

19

20

21 22

23

24

25

 

14 15

16

17

18

19

20

21 22

23

24

25

25-pin male connector

 

25-pin male connector

 

 

Name

 

 

 

 

 

Abbr

Pin

Pin

Abbr

 

 

 

 

Name

 

 

 

 

 

 

 

 

Shield

Chassis GND

1

1

Chassis GND

Shield

 

 

 

 

 

 

Transmit Data

 

 

 

 

 

 

TxD

2

2

TxD

 

 

 

 

Transmit Data

 

 

Receive Data

 

 

 

 

 

RxD

3

3

RxD

 

 

 

 

Receive Data

 

 

Request to Send

 

 

 

 

 

RTS

4

4

RTS

 

 

 

 

Request to Send

Clear to Send

 

 

 

 

 

CTS

5

5

CTS

 

 

 

 

Clear to Send

 

 

DCE Ready

 

 

 

 

 

DSR

6

6

DSR

 

 

 

 

DCE Ready

 

 

Signal Ground

 

 

 

 

 

GND

7

7

GND

 

 

 

 

Signal Ground

 

Carrier Detect

 

 

 

 

 

 

CD

8

8

CD

 

 

 

 

Carrier Detect

 

 

Transmit Clock

 

TxC (SCT)

15

15

TxC (SCT)

 

 

Transmit Clock

 

Receive Clock

 

RxC (SCR)

17

17

RxC (SCR)

 

 

Receive Clock

 

DTE Ready

 

 

 

 

 

DTR

20

20

DTR

 

 

 

 

DTE Ready

 

 

Remote Loopback

 

 

 

 

 

 

RL

21

21

RL

 

 

 

 

Remote Loopback

Ring Indicator

 

 

 

 

 

 

RI

22

22

RI

 

 

 

 

Ring Indicator

 

 

Transmit Clock (DTE Source)

 

TT (SCTE)

24

24

TT (SCTE)

 

 

Transmit Clock (DTE Source)

Test Mode

 

 

 

 

 

 

TM

25

25

TM

 

 

 

 

Test Mode

 

 

 

Figure 2-14RS-232 Straight-Through Cable

3Com does not sell this cable.

Page 39
Image 39
3Com 32x, 52x manual RS-232 to RS-232 DCE Cable, 14RS-232 Straight-Through Cable