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

DMD20/DMD20 LBST Universal Satellite Modem Introduction
Introduction
1
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, referred to
in this manual as the "LBST". When describing the DMD20 or DMD20 LBST interchangeably,
they may be referred to as "the DMD20", "the modem", or "the unit".
Unless specifically noted, references to the DMD20 include the
DMD20 LBST.

1.0 Overview

The Radyne 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
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.
TM103 – Rev. 2.5 1-1