The ETSI (automotive) Intelligence Transport System (short ITS) stack is as follows:
A part of ETSI ITS G5 ISO/OSI stack including:
- Layer 7 Application e.g., CAM messages
- Layer 6 Presentation e.g., de-and encoding via ASN1
- Layer 5/4/3 Transport and Network e.g., BTP + GeoNetworking, compare https://www.etsi.org/deliver/etsi_en/302600_302699/3026360501/01.02.01_60/en_3026360501v010201p.pdf and https://www.etsi.org/deliver/etsi_en/302600_302699/3026360401/01.03.01_60/en_3026360401v010301p.pdf
- Layer 2 Data link e.g., UDP
- Layer 1 Physical through hardware and driver