Chapter 1. Introduction; Overview - Radyne DMD20 Installation And Operation Manual

This chapter provides an overview of the DMD20/DMD20 LBST Universal Satellite Modem. The
DMD20 will be referred to in this manual as "the standard unit" and the DMD20 LBST will be
referred to as the LBST. When describing the DMD20/DMD20 LBST, it may be referred to as
"the DMD20", "the modem", or "the unit".
1.1

Overview

The Radyne DMD20/DMD20 LBST Universal Satellite Modem (Figure 1-1 & Figure 1-2) offers the
best features of a sophisticated programmable IBS/IDR and Closed Network Modem, at an
affordable price
Figure 1-2 DMD20 LBST Universal Satellite Modem Front Panel
This versatile equipment package combines unsurpassed performance with numerous user-
friendly Front Panel Programmable Functions. The unit provides selectable functions for different
services: Intelsat IDR and IBS, DVB, Low-density Parity Check Coding (LDPC) and Closed
Networks are supported. 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 Modem may be used with the Radyne 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 are available. Interface types are selectable from
V.35, RS-232, RS-422/-530, ITU G.703, HSSI, ASI, DVB/M2P and Ethernet Bridge.
MN-DMD20-20LBST Revision 14

Chapter 1. INTRODUCTION

Figure 1-1 DMD20 Universal Satellite Modem Front Panel
1–1