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.
Common questions
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.