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.
Open preview (PDF)Road vehicles — In-vehicle Ethernet — Part 6: Electrical 100-Mbit/s physical entity requirements and conformance test plan
