
ASM-40 Ver. 1.0 Overview 1-1
Chapter 1
Introduction
1.1 Overview
ASM-40 is a high speed, synchronous short-range modem operating at full-duplex
over unconditioned lines. ASM-40 also functions as a baud rate and interface
converter.
Product Options
The following versions of the modem are available:
• ASM-40 standalone unit
• ASM-40/R: a plug-in card for installation in the ASM-MN-214, 19-inch modem
rack, holding up to 14 cards.
Power Supply Options
The following power supply versions are available:
• 100–240 VAC or -48 VDC
• 24 VDC .
Applications
Figure 1-1
illustrates the ASM-40 point-to-point interface and rate conversion
application.
V.35 (256 kbps) V.35 (256 kbps)E1 (2048 kbps)
1.75 km (1 mile)
ASM-40ASM-40
DTE DTE
Figure 1-1. Point-to-Point Interface and Rate Conversion Application
Figure 1-2
illustrates the ASM-40 tail-end application.
1.75 km (1 mile) 1.75 km (1 mile)
ASM-40
External
Clock
Receive
Clock
Receive
Clock
Internal
Clock
ASM-40ASM-40 ASM-40
DTE DTE
Figure 1-2. Tail-End Application for DDS Service
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