Protocol scope and method
The tool splits TLVs and names a small set of common IDs. Vendor extensions remain visible as raw hex.
record = id(1) + length(1) + value(length).
Common questions
Does the JT/T 808 Extra Information TLV 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.