RAD Data comm FOM-40 Dokumentacja Pobierz pdf (Strona 67)

Introduction D-1

Appendix D

IR-X.21Interface Module

D.1 Introduction

IR-X.21 is an interface module that converts X.21 signals to TTL levels. The

converted data is sent over the modem link, using the modem modulation

technique, and is converted back at the other end into X.21 signals, or into any

other digital interface signal.

Figure D-1 shows a typical application of FOM-40 with IR-X.21 interface module.

FOM-40 FOM-40

Fiber Optic Cable

Router Router

X.21 X.21

Figure D-1. Typical Application of FOM-40 with IR-X.21 Module

Standalone FOM-40 Connector

Figure D-2 shows the IR-X.21 interface module. Table D-1 lists the module DB-15

connector pin assignment.

Figure D-2. IR-X.21 Module

Table D-1. IR-X.21 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

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 73 74

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RAD Data comm FOM-40 Dokumentacja Strona 67