Comtech EF Data DM240XR - Manual (Page 15)

MN-DM240XR– Revision 13 1–1
Chapter 1. INTRODUCTION
This chapter provides an overview of the DM240XR High-Speed Digital Modulator. The
DM240XR will be referred to in this manual as “the DM240XR”, “the modulator”, or “the unit”.
1.1 Description
The New Standard in Digital Modulator Performance
Radyne’s DM240XR 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
DM240XR offers various options that comply to the international standards, supporting both
DVB-S and DVB-S2 specifications. With a variety of frequency options and Plug-In Data
Interfaces (PIIC), it provides greater flexibility for changing and upgrading the unit the required
application.
The DVB-S Network specification complies with both EN300-421 and EN301-210 ETSI
specifications. The DM240XR supports FEC rates of BPSK, QPSK, 8PSK and 16QAM
applications with symbol rates up to 68 Msps.
The DVB-S2 Network specification complies with the next generation DVB open standard
supported by ETSI EN302-307. At the core of this standard is a powerful Bose-Chaudhuri-
Hocquenghem BCH encoder and concatenated Low-Density Parity Check (LDPC). The DVB-S2
FEC rates supported are BPSK, QPSK, 8PSK and 16APSK with symbol rates up to 45Msps.
Figure 1-1 DM240XR
The powerful new onboard Monitor and Control (M&C) processor has the unique capability to
download firmware and enhance features from a field-changeable Flash Card. Offering
unprecedented flexibility, this feature represents a new level of Radyne 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 2050 MHz (L-Band) in 1 Hz steps. Variable data rates from 1 Mbps to 238
Mbps can be set in 1 bps steps.
The DM240XR, AutoEQ™ option supports SCPC equalization of Group Delay and Amplitude.
Installing the AutoEQ™ PIIC Interface allows the ability to compensate for the overall system
Group Delay and Amplitude Flatness over the satellite by pre-distorting the Uplink Carrier,