Specifications

ASMi-31 Ver. 3.0 Introduction D-1
Appendix D
IR-G.703/CO Interface
Module
D.1 Introduction
IR-G.703/CO is an interface module for RAD modems, converting G.703 64 kbps
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:
• Standalone version, which fits into a standalone modem and is available with
two types of physical connections: a terminal block or an RJ-45 (see
Table D-
1
for the RJ-45 connector pinout).
• Rack version, which is mounted on the ASMi-31/R 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 (see
Appendix A for the DB-25 connector
pinout).
Figure D-1 illustrates the rear panel of the ASMi-31 modem equipped with the
IR-G.703/CO interface module.
GND
245
LINE
G.70 3
XMTRCVGND
~ 100-240VAC/ 48/60VDC
Return Power
Figure D-1. Rear Panel of ASMi-31 with IR-G.703/CO Module
Table D-1. RJ-45 Connector Pinouts
Pin Function
3 RCV (+)
6 RCV (-)
4 XMT (+)
5 XMT (-)
2 GND