Protocol scope and method
The base fields include the 0x30316364 marker, packet sequence, six-byte SIM BCD, channel and a packed data/subpackage type byte. Later fields depend on data type.
dataType = packed high nibble; subpackageType = packed low nibble.
Diagnostic scenario
Extract a redacted media packet beginning at the JT/T 1078 marker. Decode sequence, SIM BCD, channel and packed type fields, then choose the remaining timestamp and payload-length layout according to data type and subpackage state.
How to interpret the result
The base header is only the first decision point; later fields are conditional. A valid marker with an impossible type or length can indicate a shifted capture boundary. Sequence and timestamp semantics should be checked across multiple packets, not one sample.
Input reference
- Packet header hex
- Example default: Sample input included
Common mistakes
- Using an unredacted production capture with vehicle, credential or network identifiers.
- Applying one fixed header length to every data and subpackage type.
- Treating a successfully parsed sample as standards compliance or interoperability proof.
Before using the result
- Confirm the protocol edition, transport framing and vendor profile before interpreting fields.
- Validate conditional fields against several consecutive packets.
- Keep a redacted known-good and known-bad sample as a regression pair.
Questions to check during diagnosis
Does the JT/T 1078 Packet Header Decoder leave my browser?
No application upload is used. Avoid putting sensitive production data in shareable URLs.
Is this a standards compliance test?
No. Confirm the edition and vendor profile with licensed documents and your target platform.
Offline diagnostic aid. Verify fields, version and vendor extensions before production use.