本文件规定了与ISO 21217中规定的ITS站参考体系结构的接入层相关的一般技术细节，包括: -通信适配层（CAL）为通信提供的通信接口（CI）的服务接入点（SAP），称为IN-SAP，以及相关的服务原语和服务原语功能； -CI管理适应实体（MAE）提供的SAP，用于管理通信接口，称为MI-SAP，以及参考ISO 24102？3的相关服务原语和服务原语功能。

This document specifies general technical details related to the access layer of the ITS station reference architecture specified in ISO 21217 including: — the service access point (SAP) of a communication interface (CI) as provided by the communication adaptation layer (CAL) for communication, named IN-SAP, and related service primitives and service primitive functions; — the SAP provided by the CI management adaptation entity (MAE) for management of the communication interface, named MI-SAP, and related service primitives by reference to ISO 24102？3, and service primitive functions.