Connectors and Cables 2-19

UNIVERSAL to X.21 Adapter Cable

If you want to connect any of the SuperStack II bridge/routers documented in this guide to an X.21 DCE device, cable the connector marked UNIVERSAL using an X.21 adapter cable.

Figure 2-16 shows the pin assignments of the X.21 adapter cable.

To Universal port on bridge/router

To modem/TA or CSU/DSU

1

2

3

4

5

6

7

8

9

10

11 12

13

14

15

16 17 18 19

1

2

3

4

5

 

6

7

8

20 21

22

23 24

25

26

27

28 29

30

31

32

33

34 35

36 37

9

10

11

12

 

13

14

15

 

 

 

37-pin female connector

 

15-pin male connector

Name

Abbr

Send Data

SD (A)

Send Data

SD (B)

Receive Data

RD (A)

Receive Data

RD (B)

Send Timing

ST (A)

Receive Timing

RT (A)

Send Timing

ST (B)

Receive Timing

RT (B)

Terminal Ready

TR (A)

Terminal Ready

TR (B)

Data Mode

DM (A)

Data Mode

DM (B)

Request to Send

EIA (A)

Receiver Ready

RR (A)

Clear to Send

CS (A)

Request to Send

EIA (B)

Receiver Ready

RR (B)

Clear to Send

CS (B)

Signal Ground

SG

Shield

Sheild

Pin

 

Pin

Abbr

Name

4

 

2

TA

Transmit Data (A)

22

 

9

TB

Transmit Data (B)

6

 

4

RA

Receive Data (A)

24

 

11

RB

Receive Data (B)

5

 

6

SA

Receive Clock

8

 

 

 

 

23

 

13

SB

Receive Clock

26

 

 

 

 

12

 

3

CA

Control (A)

30

 

10

CB

Control (B)

11

 

5

IA

Indicate (A)

29

 

12

IB

Indicate (B)

7

 

 

 

 

13

 

 

 

 

9

 

 

 

 

25

 

 

 

 

31

 

 

 

 

27

 

 

 

 

19

braid

8

GND

Ground

1

1

Sheild

Shield Drain

 

Figure 2-16UNIVERSAL to X.21 Adapter Cable

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Image 41
3Com 32x, 52x manual Universal to X.21 Adapter Cable, 16UNIVERSAL to X.21 Adapter Cable