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Appendix - Overview of the Used Technologies MDM6000 Satellite Modem
16.3 Wideband
The MDM6000 supports baudrates from 1Mbaud up to 72Mbaud. It also supports bidirectional
transmission up to 2 times 375Mbps, or an unprecedented total bitrate of 750Mbps.
16.4 Clean Channel Technology™
Clean Channel Technology™ is a combination of improved roll-off factors for DVB-S2 and advanced
filtering technologies to allow optimal carrier spacing. The combination can bring efficiency gains up
to 15%.
Clean channel technology consists out of the following three effects.
A first effect in the Clean Channel Technology™ is applying a smaller Roll-Off (RO) percentage than
currently used in the DVB-S2 standard. In the DVB-S2 standard the 20% and 25% Roll-Off factor
percentages are common. Basically this means that these percentages need to be added to the
desired bandwidth over satellite. Reducing these Roll-Off factors to 5%, 10% or 15% results in a
direct gain in bandwidth. This is reflected in the following formula:
Occupied bandwidth = Symbol Rate*(1+Roll-Off factor). The following figure compares 20% roll-off
with 5% roll-off.
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