Section 1 - Introduction; Overview; Dmd20 Configurations - Radyne DMD20 Installation And Operation Manual

DMD20 Universal Satellite Modem
This chapter provides an overview of the DMD20 Universal Satellite Modem, referred to in this
manual as "the modem" or "the unit."

1.0 Overview

The Radyne ComStream Corporation DMD20 Universal Satellite Modem (Figure 1-1) offers the
best features of a sophisticated programmable IBS/IDR and Closed Network Modem, at an
affordable price.
Figure 1-1. DMD20 Universal Satellite Modem Front Panel
This versatile equipment package combines unsurpassed performance with numerous user-
friendly Front Panel Programmable Functions. The DMD20 provides selectable functions for
different services: Intelsat IDR and IBS, as well as closed networks. All of the configuration and
Monitor and Control (M&C) Functions are available at the Front Panel. Operating parameters,
such as variable data rates, FEC Code Rate, modulation type, IF Frequencies, IBS/IDR Framing
and interface type can be readily set and changed at the Front Panel by earth station operations
personnel.
The modem operates at all standard IBS and IDR Data Rates up to 8.448 Mbps. Selection of any
data rate is provided over the range of 2.4 Kbps to 20 Mbps in 1 bps steps.
For applications requiring system redundancy, the DMD20 Modem may be used with the Radyne
ComStream Corporation RCS11 1:1 Redundancy Switch or the RCS20 M:N (N < 9) Redundancy
Switch. An Internal Engineering Service Channel Unit is available to provide voice, data, and
alarms for Intelsat IDR applications.
A full range of Industry Standard Interfaces is available for the DMD20. Interface types are
selectable from V.35, RS-232, RS -422/449 and ITU G.703.

1.1 DMD20 Configurations

The DMD20 can be configured many different ways.
Features and options that are installed at the time of order.
Feature Upgrades.
Hardware options that the user can install on site.
Options that are installed to a unit sent to Radyne ComStream Corporation's facility.
TM103 – Rev. 1.1

Section 1 - Introduction

Introduction
1-1