Description - Radyne DMD2401 LB Installation And Operation Manual

DMD2401 LB/ST L-Band Satellite Modem and ODU Driver Introduction
Section 1 – Introduction

1.0 Description

The Radyne ComStream Corporation DMD2401 LB/ST L-Band Satellite Modem and Outdoor
Unit (ODU) Driver is a microprocessor-controlled Binary Phase Shift Keyed (BPSK), Quadrature
Phase Shift Keyed (QPSK), Offset Quadrature Phase Shift Keyed (OQPSK), 8PSK Trellis Coded
8-Phase Shift Keyed Modulator and Demodulator for use as part of the transmitting and
receiving ground equipment in a satellite communications system. The DMD2401 LB/ST has the
capability of delivering power and a 10 MHz Reference Signal to a Low Noise Block
Downconverter (LNB) and also to a Block Upconverter (BUC) capable of an 8-Watt Output. The
DMD2401 LB/ST Modem may be referred to as the "modem" throughout the remainder of this
document.
This versatile equipment package combines unsurpassed performance with numerous user-
friendly Front Panel programmable functions. All of the configuration, monitor and control
functions are available at the Front Panel. Operating parameters such as variable data rates,
FEC Code Rate and IF/RF Frequencies can be readily set and reconfigured from the Front Panel
by earth station operations personnel. Additionally, all functions can be accessed with a terminal
or personal computer via a serial link for complete remote monitor and control capability.
The DMD2401 LB/ST operates at data rates up to 4.375 Mbps. Selection of any data rate is
provided over the range of 9.6 Kbps to 4.375 Mbps in 1 bps steps.
The DMD2401 LB/ST is designed to perform as both ends of a satellite Single Channel Per
Carrier (SCPC) Link or as the VSAT remote site modem in a TDMA Hub System. The Modulator
and Demodulator operate independently using BPSK, QPSK, OQPSK, or 8PSK Modulation in
either SCPC or VSAT Modes.
The DMD2401 LB/ST is programmable from the Front Panel. The program menu was
specifically designed for ease of use to quickly put the modem online and for any network
changes. The modem also can be monitored and controlled through the RS-485 or RS-232
serial control channel.
Figure 1-1. DMD2401 LB/ST L-Band Satellite Modem and ODU Driver
The DMD2401 is also the ideal VSAT modem for use in a Point-to-Point Frame Relay Hybrid
Network. Other applications include FDMA, telephony, video conferencing, long-distance
learning, paging and newsgathering.
Refer to Table 1-1 for selection of any data rate that is provided over the following ranges:
TM075 - Rev. 1.3 1-1