RAD Data comm ASM-20 Appendix B IR-G.703 Codirectional Interface 64 kbps, General Description

Appendix B

IR-G.703 Codirectional Interface (64 kbps)

B.1 Introduction

This appendix:

∙Provides a general description of the IR-G.703 codirectional interface (64 kbps)

∙Describes the EXT mode for the IR-G.703 codirectional interface (64 kbps)

∙Describes the INT/RCV mode for the IR-G.703 codirectional interface (64 kbps).

B.2 General Description

The IR-G.703 is an interface module for RAD modems, converting G.703 codirectional signals to TTL levels. The converted data is sent over the modem link using the modem modulation technique and converted back at the other end into G.703 64 kbps codirectional signals, or into any other digital interface signal possible. The module is available in the following two versions:

∙The Standalone version fits into a standalone modem and is available with two types of physical connections: a terminal block or an RJ-45.

∙The Rack version is mounted on the rack version modem card and uses the modem edge connector for communication. The edge connector is wired, on the motherboard of the card cage, to the DB-25 connector on the back plane of the ASM-MN-214 card cage. Figure B-1illustrates the pinout of the different connectors.

General Description B-1