本文件规定了基于互联网协议（IPv4，[3]和IPv6，[4]）的公共交通工具中可能使用的不同系统之间车载数据通信系统的一般规则。这包括运营支持系统、乘客信息系统、售检票系统等。本文档描述:-对车载IP网络的要求；-基于IP的板载网络的总体结构和组件；-网络体系结构的模块化结构；-面向服务的体系结构（SOA）方法，以及定义服务的方法。与车辆安全运行直接相关的系统（包括推进管理、制动系统、开门系统）不在本文件的范围内，并在其他标准化机构中进行处理。然而，本文档中描述的架构可用于支持服务，例如安全信息消息。安全关键系统的接口应通过具有适当安全规定的专用网关提供；就本文件而言，这些仅被视为外部信息源。本文件主要设计用于具有固定主要结构的车辆，其中网络可以永久安装，系统配置任务主要包括集成、调整或移除产生和/或使用数据的功能性终端系统。由为运行目的临时连接的单元组成的公共交通车辆（特别是个别发动机、车辆或组件常规连接和断开的列车）需要额外的机制，以使通信网络本身能够重新配置。这种机制是通过其他标准提供的，特别是IEC 61375系列[5]。

This document specifies the general rules for an on-board data communication system between the different systems that may be used within public transport vehicles, based on the Internet Protocol (IPv4, [3] and IPv6, [4]). This includes operational support systems, passenger information systems, fare collection systems, etc. This document describes: - the requirements for an on board IP network; - the overview architecture and components for an IP based on-board network; - the modular structure of the network architecture; - the Service Oriented Architecture (SOA) approach, and approach to defining services. Systems directly related to the safe operation of the vehicle (including propulsion management, brake systems, door opening systems) are excluded from the scope of this document and are dealt with in other standardization bodies. However, the architecture described in this document may be used for support services such as safety information messages. Interfaces to safety-critical systems should be provided through dedicated gateways with appropriate security provisions; for the purposes of this document, these are regarded as simply external information sources. This document is designed primarily for vehicles with a fixed primary structure, where networks can be installed on a permanent basis and the system configuration task consists largely of the integration, adjustment or removal of the functional end systems that produce and/or consume data. Public transport vehicles consisting of units linked temporarily for operational purposes (specifically, trains in which individual engines, cars or consists are routinely connected and disconnected) require additional mechanisms to enable the communications network itself to reconfigure. Such mechanisms are provided through other standards, notably the IEC 61375 series [5].