ISO 20794-6-2020 PDF

Full title and description

ISO 20794-6:2020 — Road vehicles — Clock extension peripheral interface (CXPI) — Part 6: Transport and network layer conformance test plan. This part of ISO 20794 specifies the conformance test plan for the transport and network layers of the CXPI automotive communication protocol, defining test concepts, test cases and criteria for verifying transport/network behaviour, diagnostic transport and node configuration data transport, and error detection.

Abstract

This document specifies a transport and network layer conformance test plan for CXPI implementations. It tests transportation of diagnostic communication, node configuration data and network layer services using service interface parameters reported by lower OSI layers and submitted to higher OSI layers. The conformance plan covers: concept of operation test plan, transport layer protocol test cases, network layer services test cases, and error-detection test cases.

General information

• Status: Published.
• Publication date: October 2020 (ISO edition 1, 2020).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 43.040.15 (Car informatics / On-board computer systems).
• Edition / version: Edition 1 (2020).
• Number of pages: 30 (ISO published document length).

(General bibliographic and lifecycle data per ISO bibliographic record.)

Scope

ISO 20794-6:2020 defines the conformance test plan for the CXPI transport and network layers. The scope is limited to tests that verify correct mapping and transport of service interface parameters between OSI layers for diagnostic messages and node-configuration data, validation of transport-layer protocol behaviour (including packetization, identifiers and protocol control information), verification of network-layer addressing and timing for diagnostic/configuration segments, and error-detection behaviour under specified conditions. The document is intended to be used in conjunction with the protocol and layer specifications in the other parts of ISO 20794.

Key topics and requirements

• Concept of operation for transport/network conformance testing (test environment, roles, preconditions and test sequences).
• Transport layer protocol conformance tests: packet formation, protocol control information, identifiers, segmentation/reassembly and transport error handling.
• Network layer services conformance tests: node addressing, segment timing, routing of diagnostic/configuration segments and timing constraints.
• Error detection and fault injection tests to verify detection and handling of transport/network errors.
• Pass/fail criteria, test case descriptions and required test stimuli/observations for repeatable laboratory verification.
• Test prerequisites and reference to lower-layer conformance requirements (data link and physical layers) and upper-layer service interfaces.

Typical use and users

Primary users are automotive OEMs, ECU and module suppliers, diagnostics-tool vendors, test houses and certification laboratories who need to verify CXPI transport/network conformance. The standard is used to validate implementations of CXPI in body electronics, zone-ECU interfaces and similar low-speed automotive networks where CXPI is applied. It is also used by component manufacturers and R&D teams to demonstrably meet interoperability and diagnostic transport requirements.

Related standards

ISO 20794 is a multipart standard covering the CXPI protocol family; related parts include ISO 20794-2 (Application layer), ISO 20794-3 (Transport and network layer specification), ISO 20794-4 (Data link and physical layers), ISO 20794-5 (Application layer conformance test plan) and ISO 20794-7 (Data link and physical layer conformance test plan). Users implementing or testing transport/network conformance are expected to consult the protocol specification parts (e.g., -2, -3, -4) and the corresponding conformance parts (-5, -7) for complete verification.

Keywords

CXPI, clock extension peripheral interface, transport layer, network layer, conformance test plan, automotive communications, diagnostic transport, node configuration, ISO 20794, ECU testing.

FAQ

Q: What is this standard?

A: ISO 20794-6:2020 is the part of the ISO 20794 series that provides the conformance test plan for the transport and network layers of the CXPI automotive communication protocol, describing the tests, procedures and pass/fail criteria for those layers.

Q: What does it cover?

A: It covers test concepts and concrete test cases for verifying transport and network layer functionality related to diagnostic communication and node configuration data, including error-detection test scenarios and the mapping of service interface parameters between OSI layers.

Q: Who typically uses it?

A: Automotive OEMs, module and IC suppliers, diagnostic-tool developers, test laboratories and compliance/certification bodies use this part to validate CXPI implementations and to demonstrate interoperability and correct protocol behaviour.

Q: Is it current or superseded?

A: ISO 20794-6:2020 was published in 2020 (edition 1) and is published/active in the ISO catalogue; ISO standards are subject to periodic review (typically every five years). Users should check their national or ISO catalog records for any amendments or later revisions before relying on the standard for new certification work.

Q: Is it part of a series?

A: Yes — ISO 20794 is a multipart international standard for the CXPI protocol. Part 6 is the transport/network conformance plan; other parts cover application protocols, layer specifications and conformance test plans for application, data link and physical layers. Coordinated use of the relevant parts is required for full protocol conformance verification.

Q: What are the key keywords?

A: CXPI, transport layer, network layer, conformance test plan, diagnostic communication, node configuration, error detection, ISO 20794.