SDT

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SDT (Service Description Table) is a service information element carried within a DVB transport stream, it gives user-oriented information about services in the transport stream.

The SDT typically contains information such as the name of the service, the service ID, the status of the service (e.g. running/not running/starting in a few seconds) and whether the service is scrambled or not.

For further information see http://www.interactivetvweb.org/tutorials/dtv_intro/dtv_intro