Chapter 13 Encryption and Scrambling
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Service Level Scrambling
The alternative to elementary stream level scrambling is to scramble all components
that make up a service with the same CW. In this case, there is only one stream of
ECM messages associated with the service as a whole.
When scrambling at the service level, all elementary streams within the service are
scrambled using the same CW. Only one ECM is required for each service. The CA
descriptor is inserted near the top of the PMT.
Note:
Elementary stream level scrambling and service level scrambling can be mixed
within the scrambler but not within the same service.
Содержание RF Gateway 1 Modules
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