SHAPING THE FUTURE SATELLITE OF COMMUNICATIONS
8 FEATURES
8.1 Rate Adaptation
In principle a one to one relationship exists between the ASI Interface bit rate and
the symbol rate of the modulator. With rate adaptation this is no longer true. It is
possible to set one variable independent of the other.
When activated, the on-board rate adapter will insert MPEG null packets as
required to obtain a fixed transmit symbol clock, even if the net input transport rate
is variable. It is necessary to explicitly allow for null packet dropping. The rate
adapter will also adjust MPEG PCR time stamps as required by the MPEG
specifications. The rate adapter buffer is operated at minimum delay, but can store
more than 1000 packets for bursty input.
When the rate adapter is disabled, the modulator transmit clock will be slaved to
the transport stream clock rate.
The monitoring output is fully regenerated and by default branched to the rate
adapter input.
Navigate to:
• AZ110 >> Modulator >> Control >> Interfaces >> Main
The parameter MPEG framing allows configuring the rate adapter.
Figure 44- Rate Adaptation
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