CEN 13149系列产品涉及公共交通车载数据通信系统 车辆。本系列提供的数据服务支持相关数据的开放和管理共享 信息 本文档是本系列的第9部分，指定了一个时间出版物，使所有车载服务 基于合适的约定主网络时钟，共享对当前时间的共同理解。购买本文件时可获得的所有当前修订均包含在购买本文件中。

The CEN 13149 series of products concerns on-board data communication systems on public transport vehicles. This series provides for data services that enable open and managed sharing of relevant information. This document, being Part 9 of the series, specifies a time publication, enabling all on-vehicle services to share a common understanding of current time, based on a suitable agreed master network clock.All current amendments available at time of purchase are included with the purchase of this document.