DoIP

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DoIP ( Diagnostics over Internet Protocol ) is a communication protocol used in automotive electronics that is specified in the ISO standard 13400-2.

DoIP in the OSI layer model

DoIP serves as the transport protocol for Unified Diagnostic Services (UDS ISO 14229-1). UDS is on OSI layer 7, the application layer . Diagnostics over Internet Protocol runs over the TCP / IP protocol stack. TCP / UDP on OSI layer 4 is used as the transport protocol. For this purpose, IP is used as the switching protocol on OSI layer 3. Ethernet is the protocol that is used on the data link layer on OSI layer 2. A 100BASE-TX twisted pair copper line on OSI layer 1 serves as the physical medium.

Advantages over ISO-TP (ISO 15765-2)

The clear advantage over diagnosis via CAN with the ISO-TP (ISO 15765-2) transport protocol is the 200 times higher gross data rate of 100 Mbit / s. In addition, there is a cost advantage due to the very widespread hardware components, which include the Ethernet controller and the 100BASE-TX cable including the RJ-45 connector. Eliminating a hardware VCI required for CAN also reduces costs and only requires an Ethernet interface on the PC for the connection.

Individual evidence

1. ↑ ISO 14229-1, Road vehicles - Unified diagnostic services (UDS) - Part 1: Specification and requirements, 2013