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<blockquote data-quote="KevinM" data-source="post: 153624" data-attributes="member: 50013">Well, not sure I know exactly what MP means by these things but trawling the net gives :-PAT : PAT stands for Program Association Table. The PAT lists PIDs for all PMTs in the stream. Packets containing PAT information always have PID 0x0.PMT : Program Map Tables, or PMTs, contain information about programs. For each program, there is a PMT, with the PMT for each program appearing on its own PID. The PMTs describe which PIDs contain data relevant to the program. PMTs also provide metadata about the streams in their constituent PIDs. For example, if a program contains an MPEG-2 video stream, the PMT will list this PID, describe it as a video stream, and provide the type of video that it contains (in this case, MPEG-2). The PMT may also contain additional descriptors providing data about its constituent streams.CAT : Conditional Access Table, metadata in a MPEG-2/DVB streamSDT : Service Description Table (SDT - used to tell the receiver the names and types of programming available on each channel) along with the Time and Date Table (TDT - tells the receiver about programming events on the channels - used to build the electronic program guide).VCT : the Virtual Channel Table (VCT) is the thing that ties everything together. This lists each channel on the entire DCII system across multiple satellites and contains an index the appropriate TDT, SDT, MMT and CDT tables so that the receiver can select the correct channel analog or digital. If the channel is digital, the VCT also contains the MPEG-2 Program Number (although it's called Service Number in Motorola parlence) so the receiver can process the MPEG-2 PAT and PMT to actually display the program</blockquote>

[QUOTE="KevinM, post: 153624, member: 50013"] Well, not sure I know exactly what MP means by these things but trawling the net gives :- PAT : PAT stands for Program Association Table. The PAT lists PIDs for all PMTs in the stream. Packets containing PAT information always have PID 0x0. PMT : Program Map Tables, or PMTs, contain information about programs. For each program, there is a PMT, with the PMT for each program appearing on its own PID. The PMTs describe which PIDs contain data relevant to the program. PMTs also provide metadata about the streams in their constituent PIDs. For example, if a program contains an MPEG-2 video stream, the PMT will list this PID, describe it as a video stream, and provide the type of video that it contains (in this case, MPEG-2). The PMT may also contain additional descriptors providing data about its constituent streams. CAT : Conditional Access Table, metadata in a MPEG-2/DVB stream SDT : Service Description Table (SDT - used to tell the receiver the names and types of programming available on each channel) along with the Time and Date Table (TDT - tells the receiver about programming events on the channels - used to build the electronic program guide). VCT : the Virtual Channel Table (VCT) is the thing that ties everything together. This lists each channel on the entire DCII system across multiple satellites and contains an index the appropriate TDT, SDT, MMT and CDT tables so that the receiver can select the correct channel analog or digital. If the channel is digital, the VCT also contains the MPEG-2 Program Number (although it's called Service Number in Motorola parlence) so the receiver can process the MPEG-2 PAT and PMT to actually display the program [/QUOTE]

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