NIT (network Information Table)
This optional table may provide information about the multiplexes and transport streams on a given network. ISO/IEC 13818-1 does not define NIT content. ETSI-EN 300 468 (DVB-SI) does. The purpose of mentioning but not defining this table in MPEG-2 is that it is referenced by program number 0 (zero) in the PAT.
Read more about this topic: Program-specific Information
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