Cables and Connectors

Cable and Connector Pin-Outs

X.21 WAN Cable—Minimum Pin-Out

WAN link end

 

Router end

 

X.21 Signal Name and Circuit

15-pin male

 

62-pin male

 

 

2

 

 

 

17

T

Send Data, A

 

 

 

3

 

 

 

16

C

Control, A

 

 

 

4

 

 

 

 

1

R

Receive Data, A

 

 

 

 

5

 

 

 

4

I

Indicator, A

 

 

 

6

 

 

 

3

S

Send Timing, A

 

 

 

8

 

 

 

9

G

Ground

 

 

 

 

 

 

 

32

 

 

 

 

 

 

 

 

 

 

 

 

47

 

 

 

 

 

 

 

 

9

 

 

 

38

T

Send Data, B

 

 

 

10

 

 

 

37

C

Control, B

 

 

 

11

 

 

 

 

22

R

Receive Data, B

 

 

 

12

 

 

 

25

I

Indicator, B

 

 

13

 

 

 

24

S

Send Timing, B

 

 

 

and Cables Connectors A

A-11