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Chapter 1. INTRODUCTION
1.1 Overview
Figure 1-1. CDM-760 Advanced High-Speed Trunking Modem
The CDM-760 Advanced High-Speed Trunking Modem (Figure 1-1) accommodates Internet
Service Provider (ISP) and Telco backhaul links using advanced space segment saving capabilities
while minimizing the need for unnecessary overhead. The CDM-760’s high-performance
architecture allows efficient networking and transport over satellite links while supporting a
wide range of applications and network topologies.
The CDM-760 offers an expansive, ultra wide range of symbol rates (100 ksps to 150 Msps) and
data rates (100 kbps to 314 Mbps or, when run in a duplex setting, 628 Mbps or 300 Msps).
Coupling these speeds with the native Super Jumbo Frame (SJF) Ethernet interface, the
CDM-760 supports Ethernet frames from 64 bytes to >10,000 bytes, and processes Ethernet
frames >600,000 packets/second, or >1.2 Million packets/second when run in a duplex setting.
DVB-S2 has been widely accepted as one of the most spectrally efficient standards-based
waveforms. Expanding on the efficient DVB-S2 EN 302 307 standards, the CDM-760 furthers
spectral efficiency with its DVB-S2-EB1, DVB-S2-EB2 Efficiency Boost, and DVB-S2 Extended
(DVB-S2X) technology waveforms:
• DVB-S2-EB1 affords a 10% to 35% increase in efficiency over the DVB-S2 standard without
an increase in power or occupied bandwidth. The CDM-760 accomplishes this task by
virtually doubling the number of available ModCods and introducing three new spectral
rolloff (ROF) figures (5%, 10%, and 15%).
• DVB-S2-EB2 further increases throughput for 16APSK and 32APSK constellations and adds
64APSK constellations to the modem.
• The DVB-S2 Extended (DVB-S2X) specification features reduced rolloff options, additional
ModCods, and greater efficiency when compared to DVB-S2.
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