PSI:
PSI is called Program Specic Information. PSI contains the data that enable the STB to demultiplex the services. These services are carried out in one or more streams all of these streams are having the PIDs. The services are scrambled but the PSI tables are not scrambled because it would be difcult for STB to demultiplex.
In a transport stream the PSI table is carried out in a private data structure. These private data structure is set of tables. It would be difcult to insert these tables directly in a transport stream while these tables are segmented into sections and inserted in a transport stream. In which some PIDs are predetermined while some PIDs are select-able for operator. Thus PSI is metadata of a channel which is inserted in to the Transport Stream
SI:
PSI tables provides the information about the services in it while SI tables provides some additional information of the service which is carried by different type of multiplexer and other service network. Thus SI is the additional information.
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26 дек 2019
