Comtech EF Data CDM-710G - Manual (Page 27)

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Chapter 1. INTRODUCTION
1.1 Overview
The CDM-710G High-Speed Satellite Modem (Figure 1-1) provides transmission of data using
the same powerful DVB-S2 techniques developed for video delivery in Digital Video Broadcast
(DVB) applications. It operates over satellite links with programmable symbol / data rates up to
45 Msps. The CDM-710G is intended for transmission of non-MPEG2 data. Its companion
product, the CDM-710, supports MPEG2 formats with various data interfaces.
Figure 1-1. CDM-710G High-Speed Satellite Modem (L-Band version shown)
Various modulations and coding combinations compliant with DVB-S2 are provided. The
modulation types supported include DVB-S2 QPSK, 8PSK, 16APSK and 32APSK.
Note: DVB-S and DVB-DSNG are not supported.
Constant Coding and Modulation (CCM) operation with a single input stream is provided for
operation. The unit is available in modulator only, demodulator only, and modem configurations.
The operating frequency of the CDM-710G is available in the following versions:
CDM-710G (70/140 MHz) 52 to 88 MHz and 104 to 176 MHz in 100 Hz resolution
CDM-710GL (L-Band) 950 to 1950 MHz in 100 Hz resolution
The terrestrial data interfaces, as depicted in the block diagram shown in Figure 1-2, are field
removable to allow different interface types:
• CDI-10-1 Single G.703 E3/T3/STS1 Interface
• CDI-60 HSSI Interface
• CDI-70 1000 Base-T Ethernet (GigE) Interface
The CDM-710G is compact, being 1RU high x 18.65 inches deep, with low power consumption.
It has a front panel Vacuum Fluorescent Display (VFD) and keypad for local configuration and