User Manual for AZ110 Broadcast Satellite Modulator with ASI interface
SHAPING THE FUTURE SATELLITE OF COMMUNICATIONS
CCM
When the same modulation and coding is used for all frames of the DVB-S2
carrier, the mode of operation is called CCM (Constant Coding and Modulation).
A DVB-S2 CCM uplink signal must be dimensioned according to the smallest
receiving station and the higher possible signal fading, to ensure adequate signal
availability in all receiving stations.
HUBHUB
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QPSK 4/5 (DVB-S2)
Figure 41 - CCM
VCM
Variable Coding and Modulation is a mode of operation that allows different
modulations parameters to be applied to the different DVB-S2 streams of a multi-
stream signal. If each of the stream is intended for a different receiving site, VCM
allows optimizing the parameters of each stream to get the best performance for
each receive station, instead of dimensioning the whole link according to the
smallest station.
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