本欧洲电信标准（ETS）规定了AT命令的配置文件，并建议使用该配置文件通过终端适配器（TA）从终端设备（TE）控制移动设备（ME）功能和GSM网络服务。在ITU-T建议V.25ter[14]中，命令前缀+C是为数字蜂窝保留的。本ETS还提供了用于构造这些扩展GSM命令的语法细节。适用时，可使用ITU-T建议V.25te[14]和现有数字蜂窝标准（TIA IS-99[15]和TIA IS-135[16]）中的命令。一些新命令的定义方式是，它们可以方便地应用于GSM以外的网络。ITU-T T.31[11]和T.32[12]传真AT命令可用于来自TE的GSM传真传输。GSM 07.05[24]中定义了GSM短消息服务AT命令。该ETS假设一个抽象架构，包括一个TE（如计算机）和一个由TA接口的ME（见图1）。 定义命令的控制范围应允许处理此抽象体系结构可能导致的任何物理实现:-TA、ME和TE作为三个独立实体；-TA整合在ME封面下，TE作为一个独立实体实施；-TA整合在TE封面下，ME作为一个单独的实体实施；-TA和ME作为一个整体整合在TE封面下。在TE和TA之间的链路上可以观察到本ETS中描述的命令。但是，大多数命令检索有关ME的信息，而不是有关TA的信息。

This European Telecommunications Standard (ETS) specifies a profile of AT commands and recommends that this profile be used for controlling Mobile Equipment (ME) functions and GSM network services from a Terminal Equipment (TE) through Terminal Adaptor (TA). The command prefix +C is reserved for Digital Cellular in ITU-T Recommendation V.25ter [14]. This ETS has also the syntax details used to construct these extended GSM commands. Commands from ITU-T Recommendation V.25te [14] and existing digital cellular standards (TIA IS-99 [15] and TIA IS-135 [16]) are used whenever applicable. Some of the new commands ar defined such way that they can be easily applied to ME of networks other than GSM. ITU-T T.31 [11] and T.32 [12] fax AT commands may be used for GSM fax transmission from TE. GSM Short Message Service AT commands are defined in GSM 07.05 [24]. This ETS assumes an abstract architecture comprising a TE (e.g. a computer) and a ME interfaced by a TA (see figure 1). The span of control of the defined commands should allow to handle any physical implementation that this abstract architecture may lead to: - TA, ME and TE as three separate entities; - TA integrated under the ME cover, and the TE implemented as a separate entity; - TA integrated under the TE cover, and the ME implemented as a separate entity; - TA and ME integrated under the TE cover as a single entity. The commands described in this ETS may be observed on the link between the TE and the TA. However, most of the commands retrieve information about the ME, not about the TA.