skyscraper8/Documentation/sophia-net-signalling.md
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# Sophia.net Signalling
When either a Private Data Descriptor or a Registration Descriptor with the value "0x534f5048" is found in any table
the following Signalling applies:
## Stream Types in PMT:
|Stream Type|Interpretation |
|0x80 |TBS 6903-X GSE Packets |
|0x81 |AC-3 Audio |
|0x82 |PID only used for PCR |
## Descriptors:
Sophia.net employs the following descriptors:
|Descriptor |Interpretation |
|0x80 |Encapsulated Transport Stream over MPE |
### 0x80: Encapsulated Transport Stream over MPE
When the following conditions all apply:
- This Descriptor is encountered in the inner loop of a PMT
- The Stream Type is 0x0D (data broadcast)
- A data_broadcast_id_descriptor is present
- data_broadcast_id is 5
THEN: This PID will contain an Encapsulated Transport Stream carried within MPE Packets.
Data within this descriptor should be a human readable description of what the Encapsulated Transport Stream is, but can be left empty.
## Other Rules:
Aside from that, the following rules shall apply:
* The IRD MUST process any TDT/TOT tables, regardless of whether the Transport Stream ID and Network ID is known or not.