Service Description Table
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The Service Description Table (SDT) is one of the DVB Service Information tables. The Service Description table describes services which are part on an MPEG transport stream. unlike analog a digital transmission may and will have multiple channels sent across in a single frequency in form of packets, the SDT has all the details pertaining to the channels that are being transported in that particular broadcast frequency.It has the Table Id value of 0x42 and will be transported under Packet ID (PID) 0x0011
There is one SDT per transport stream. The SDT may include name of the service, service identifier, service status, and whether or not the service is scrambled.
The SDT uses the reserved PID 0x0011. See ETSI EN 300 468 for technical details.
References
http://www.interactivetvweb.org/tutorials/dtv_intro
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