RAD Data comm ASM-20 Appendix B IR-G.703 Codirectional Interface (64 kbps)

6/4/99 13:17 General Description B-1
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-1 illustrates the
pinout of the different connectors.