本文件提供了物理层的补充规范，该物理层能够通过符合ISO/IEC/IEEE 8802-3:2017/Amd 9:2018的塑料光纤传输1 Gbit/s，具体应用于道路车辆内部的通信。 此外，还针对一致性测试制定了测试计划。测试计划包括测试用例，以确保IUT符合本文档中规定的功能。 ISO/IEC/IEEE 8802-3:2017/Amd 9:2018被认为对本文件的应用必不可少。 补充规范包括唤醒和同步链路睡眠功能。该规范包括支持该功能的子层、服务接口和状态图。 补充规范收集在协议实现一致性声明（PICS）中。 ISO/IEC/IEEE 8802-3:2017/Amd 9:2018和本文件中规定的要求构成了规定GEPOF物理实体功能的完整PIC。 车载以太网光学1 Gbit/s传输的光学组件要求和测试方法不在本文件范围内。

This document provides supplemental specifications to a physical layer capable of transmitting 1 Gbit/s over plastic optical fibre compliant with ISO/IEC/IEEE 8802-3:2017/Amd 9:2018, with specific application to communications inside road vehicles. Additionally, there is a test plan specified for conformance testing. The test plan includes test cases to assure compliance of an IUT with the functionality specified in this document. ISO/IEC/IEEE 8802-3:2017/Amd 9:2018 is considered indispensable for the application of this document. The supplemental specifications include wake-up and synchronised link sleep functionality. The specification includes the sublayers, service interfaces, and state diagrams that support the functionality. The supplemental specifications are collected in protocol implementation conformance statement (PICS). The requirements specified in ISO/IEC/IEEE 8802-3:2017/Amd 9:2018 and in this document constitute the complete PICS that specifies the GEPOF physical entity functionality. The optical component requirements and test methods for optical 1-Gbit/s transmission of in-vehicle Ethernet are not within the scope of this document.