Pin Assignments

EIA-530-A-to-X.21 Adapter

The EIA-530-A-to-X.21 adapter (Figure D-9) provides the X.21 interface shown in Table D-7.

530

DB25

DB15

X.21

SIGNAL

PLUG

SOCKET

SIGNAL

 

 

 

 

 

 

TD-A

2

 

 

2

TD-A

 

 

TD-B

14

 

 

9

TD-B

 

 

RD-A

3

 

 

4

RD-A

 

 

RD-B

16

 

 

11

RD-B

 

 

RXC-A

17

 

 

6

RXC-A

 

 

RXC-B

9

 

 

13

RXC-B

 

 

RTS-A

4

 

 

3

RTS-A

 

 

RTS-B

19

 

 

10

RTS-B

 

 

RLSD-A

8

 

 

5

RLSD-A

 

 

RLSD-B

10

 

 

12

RLSD-B

 

 

SIG. COMMON

7

 

 

8

SIG. COMMON

 

 

TT-A

24

 

 

7

TT-A

 

 

TT-B

11

 

 

14

TT-B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

495-14787

Figure D-9. EIA-530-A-to-X.21 Adapter

Table D-7. X.21 Cable Interface

Signal

CCITT

Direction

Pin

Number

 

 

 

 

Signal Common

102

8

 

 

 

 

Transmitted Data

103

To DSU/CSU

2 (A)

 

 

 

9 (B)

 

 

 

 

Received Data

104

From DSU/CSU

4 (A)

 

 

 

11 (B)

 

 

 

 

Request-to-Send

105

To DSU/CSU

3 (A)

 

 

 

10 (B)

 

 

 

 

Data Channel Received Line Signal Detector

109

From DSU/CSU

5 (A)

 

 

 

12 (B)

 

 

 

 

Transmit Signal Element Timing (DTE Source)

113

To DSU/CSU

7 (A)

 

 

 

14 (B)

 

 

 

 

Receiver Signal Element Timing (DCE Source)

115

From DSU/CSU

6 (A)

 

 

 

13 (B)

 

 

 

 

3162-A2-GB20-40

August 2000

D-13

Page 153
Image 153
HP 3162 manual EIA-530-A-to-X.21 Adapter, Direction Pin Number