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DM240-DVB High-Speed Digital Modulator
Introduction
Introduction
1
This chapter provides an overview of the DM240-DVB High-Speed Digital Modulator. The
DM240 will be referred to in this manual as "the DM240", "the modulator", or "the unit".
1.0 Description
The New Standard in Digital Modulator Performance
Radyne ComStream's DM240 family of High-Speed Modulators is the ideal choice to meet the
exacting standards of High Data-Rate Video, Internet and Fiber Restoral Satellite Applications.
The DM240 meets the various international standards and supports BPSK, QPSK, 8PSK and
16QAM applications with symbol rates up to 68 Msps. With a variety of data interfaces available,
the DM240 is configurable to meet high-speed satellite applications.
The powerful new onboard Monitor and Control (M&C) processor has the unique capability to
download firmware and enhance features from a field-changeable PCMCIA Card. Offering
unprecedented flexibility, this feature represents a new level of Radyne ComStream's outstanding
Customer Support. Additionally, features are added to the installed equipment base with extreme
ease, allowing the equipment to expand with changes in service while lowering initial installation
budgets.
The Modulator offers a frequency-agile IF Output from 50 to 90, 100 to 180 MHz (70/140), or 950
to 1750 MHz (L-Band) in 100 Hz steps. Variable data rates from 1 Mbps to 238 Mbps can be set
in 1 bps steps.
Additional features include the choice of remotely interfacing through one of three onboard
connections: 10 Base-T/100 Base-T Ethernet, RS-485, or RS-232. The familiar Radyne
ComStream Front Panel (Figure 1-1) offers push-button control of all features and a backlit LCD
display. Menus are specifically designed for ease of use and quick online operation as well as
changes in all modulator configurations.
Three Plug-In Interface Card (PIIC) Slots on the rear of the unit allows the customer to plug in a
variety of interfaces. These PIICs provide greater flexibility for changing and upgrading the
terrestrial interface.
An optional 1:1 Redundancy Control Switch (RCS11) is available to provide the DM240 with
superior system reliability.
Figure 1-1. DM240-DVB
TM083 – Rev. 3.0
1-1
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