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CDM-750 Advanced High-Speed Trunking Modem
Introduction
DVB‐S2 Receiver: The CDM‐750 supports DVB‐S2 QPSK, 8PSK, 16APSK, and 32APSK modulation/
demodulation up to 63 Msps with receive data rates up to 169 Mbps depending on the
modulation type and code rate.
In DVB‐S2 operation, the receiver operates in the CCM and ACM modes. The receiver
automatically detects for pilots ON/OFF and supports spectral rolloff of 20%, 25% or 35%.
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Sect. 1.3 CDM‐750 Features
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Sect. 1.4 CDM‐750 Specifications
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Appendix H. FEC (FORWARD ERROR CORRECTION)
Verification: The CDM‐750 includes many test modes and loopbacks for rapid verification of
the correct functioning of the unit. Of particular note is the IF loopback, which permits the
user to perform a quick diagnostic test without having to disturb external cabling.
During the loopback, all of the receive configuration parameters are temporarily changed to
match those of the transmit side, and an internal RF switch connects the modulator output to
the demodulator input. When normal operation is again selected, all of the previous values
are restored.
Monitor and Control Interfaces: The unit is managed through multiple interfaces providing
options for both in‐band and out‐of‐band monitor and control.
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Chapter 5. FRONT PANEL OPERATION
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Sect. 6.3 (ETHERNET‐BASED PRODUCT MANAGEMENT) SNMP Interface
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Sect. 6.4 (ETHERNET‐BASED PRODUCT MANAGEMENT) Telnet Interface
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Sect. 6.5 (ETHERNET‐BASED PRODUCT MANAGEMENT) Web Server (HTTP)
Interface
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Chapter 7. SERIAL‐BASED REMOTE PRODUCT MANAGEMENT
On‐site Firmware Updates: Field update of the operating system firmware is possible through
file upload via satellite or the Ethernet port.
Chapter 4. UPDATING FIRMWARE
On‐site Operational Upgrades: Field activation of software‐based options is possible through
Comtech's FAST (Fully Accessible System Topology) Feature upgrade process.
Appendix A. FAST OPTIONS AND ACTIVATING PROCEDURE
Table 1‐1 shows the FAST and FAST‐accessible hardware options available for the CDM‐750.
1–3
Revision 2
MN-CDM750
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