本技术规范规定了可用于公共交通车辆的不同系统之间的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，收费系统等。 本技术规范描述了: - 车载IP网络的要求; - 基于IP的车载网络的总体架构和组件; - 网络体系结构的模块化结构; - 面向服务的体系结构（SOA）方法和定义服务的方法。 与车辆安全操作（包括推进管理，制动系统，开门系统）直接相关的系统不在本技术规范范围内，并在其他标准化机构中处理。但是，本技术规范中描述的体系结构可用于支持服务，例如安全信息消息。应通过具有适当安全规定的专用网关提供与安全关键系统的接口;就本技术规范而言，这些仅被视为外部信息来源。 本技术规格主要用于配备a固定的一级结构，其中网络可以永久安装，系统配置任务主要包括产生和/或使用数据的功能性终端系统的集成，调整或删除。公共交通车辆包括暂时用于运营目的的单位（特别是单个发动机，汽车或由其组成的列车常常连接和断开）需要额外的机制来使通信网络本身能够重新配置。这些机制通过其他标准提供，特别是IEC 61375系列。 （另见5.9。）

This Technical Specification specifies the general rules for an on-board data communication system between the different systems that may be used within public transport vehicles. This includes operational support systems, passenger information systems, fare collection systems, etc. This Technical Specification 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 Technical Specification and are dealt with in other standardization bodies. However, the architecture described in this Technical Specification 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 Technical Specification, these are regarded as simply external information sources. This Technical Specification 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. (See also 5.9.)