IEC 63098-2:2022为列车和轨道侧之间的铁路通信网络提供了基于光纤的无线前端网络所需的性能、可靠性和质量保证，以及网络配置的设计指南。高速列车通信网络由两部分组成:后端网络和向列车车厢传输数据的无线接入系统。在该后端网络中，通常利用基于光纤通信的网络来降低沿铁路轨道设置的无线接入单元的复杂性，该无线接入单元将信号无线地传送到火车车厢，无线信号在中央办公室生成和处理，然后通过光纤网络传输到无线接入单元中。光纤无线电前端网络被配置为传输无线信号，该无线信号可应用于节点基站和设置在轨旁的无线电接入单元之间。 基于光纤的无线电前端链路将节点基站连接到轨旁无线电接入单元，并携带毫米波副载波或中频分量以传输高容量信号。

IEC 63098-2:2022 provides the required performance with reliability and quality assurance of radio-over-fiber-based fronthaul networks for railway communication networks between trains and tracksides, as well as a design guide for network configuration. A high-speed train communication network comprises two parts: a back-end network and wireless access system to deliver data to train cars. In this back-end network, optical fiber communication-based networks are generally utilized to reduce the complexity of the radio access units set along the railway track, which delivers the signal wirelessly to the train car, wireless signals are generated and processed at a central office, and then are transported via an optical fiber network into the radio access units. A radio-over-fiber fronthaul network is configured to transport the wireless signal, which is applicable between a node base station and radio access units set at a trackside. The radio-over-fiber-based fronthaul link connects the node base station to the trackside radio access units and carries millimeter-wave subcarrier or intermediate frequency components to transmit high-capacity signals.