RAD Data comm ASM-20 Specifiche Scaricare il pdf (Pagina 59)

Appendix C. IR- X.21B Interface Module

ASM-20

Installation and Operation Manual

C-2 IR-X.21B Interface Module 6/4/99 13:18

C.3 IR-X.21B Connectors

Figure C-2 shows the rear panel of a standalone ASM-20 with the IR-X.21B

interface module.

DTE

X21

Line Connector

Figure C-2 ASM-20 Rear Panel with X.21 Connector

The ASM-20 modem rack version requires an additional adapter to connect

between the DB-15 connector of the X.21 equipment to the DB-25

connector of the ASM-MN-214 modem rack. For this purpose, an optional

DB-15 attachment CIA/X.21 can be ordered separately from RAD. The

attachment connects to the ASM-MN-214 rear panel as shown in Figure 5-3

for the CIA/V.35 attachment.

Pin Assignment

Table C-1 shows the X.21 DB-15 pin assignment.

Table C-1 IR-X.21B DB-15 (RS-422) Connector Pin Assignment

Pin ID Function

1 Shield Chassis connection

2 A Transmit signal A

3 A Control A

4 A Receive A

5 A Indication A

6 A Signal timing A

7 A External Timing

8 GND Common

9 B Transmit B

10 B Control B

11 B Receive B

12 B Indication B

13 B Signal Timing B

14 B External Timing

1 2 ... 54 55 56 57 58 59 60 61 62 63 64 ... 70 71

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RAD Data comm ASM-20 Specifiche Pagina 59