ISO 21111-6:2021

Overview

ISO 21111-6:2021 - "Road vehicles - In-vehicle Ethernet - Part 6" defines the electrical 100‑Mbit/s physical entity requirements and conformance test plan for automotive Ethernet PHYs (transceivers). It extends the automotive profile of ISO/IEC/IEEE 8802-3 to specify advanced PHY features used for diagnostics, power management and interoperability, and it provides structured conformance test suites for PHY, PCS and PMA layers.

Keywords: ISO 21111-6:2021, in-vehicle Ethernet, automotive Ethernet PHY, 100‑Mbit/s physical entity, conformance test plan.

Key Topics and Requirements

• Advanced PHY features: Extensions to the Physical Coding Sublayer (PCS) and PHY control primitives for automotive use.
• Wake-up and sleep functionality: Definitions for low-power sleep (LPS), wake-up request (WUR), wake-up pulse (WUP), power sequencing states and related commands.
• PHY test suite and CTP structure: Conformance Test Plan (CTP) and Conformance Test Case (CTC) frameworks including test system setup for transmit and receive paths.
• PHY control IUT requirements: Tests for PHY control behavior, timers and state diagrams (with MII access).
• PCS (Physical Coding Sublayer) test suite: Transmit/receive signaling, state diagrams, SSD/ESD handling and error conditions.
• PMA (Physical Medium Attachment) tests: Electrical measurements and receiver tests such as transmitter output characteristics, jitter, PSD, MDI return loss, mode conversion loss, bit error rate and crosstalk rejection.
• Test access and interfaces: Emphasis on tests using MII access and specified test system setups.

Applications

• Ensures interoperability of 100‑Mbit/s in-vehicle Ethernet PHYs across ECUs, switches and harnesses.
• Supports design validation and production conformance testing for PHY silicon, transceivers and networking modules.
• Enables verification of power management features (wake/sleep) critical for automotive electrical systems and diagnostics.
• Provides test procedures that test labs and OEMs can use for compliance certification and supplier acceptance.

Keywords: conformance testing, PHY test suite, PCS, PMA, wake-up, low power sleep, MII access.

Who Should Use This Standard

• Automotive OEMs and system architects defining in-vehicle network requirements.
• Tier‑1 suppliers and semiconductor vendors implementing automotive Ethernet PHYs.
• Independent test laboratories and certification bodies performing conformance and interoperability tests.
• Vehicle integration and validation teams responsible for power management and diagnostics.

Related Standards

• ISO/IEC/IEEE 8802-3 (Ethernet physical layer family)
• Other parts of the ISO 21111 series (in-vehicle Ethernet profiles and requirements)

Use ISO 21111-6:2021 when you need a standardized, testable specification for 100‑Mbit/s automotive Ethernet PHY electrical behavior, power sequencing and laboratory conformance testing.