33.050;33.020 标准查询与下载

LST EN 300 766 V1.2.1-2007 接入和终端（AT）；在任一端或两端的结构化 2 048 kbit/s 接口上提供具有八位字节完整性的多条 64 kbit/s 数字无限制租用线路（D64M）；连接特性和网络接口表示

Access and Terminals (AT);Multiple 64 kbit/s digital unrestricted leased lines with octet integrity presented at a structured 2 048 kbit/s interface at either or both ends (D64M);Connection characteristics and network interface presentation

LST EN 300 686 V1.2.1-2007 接入和终端（AT）；34 Mbit/s和140 Mbit/s数字租用线路（D34U、D34S、D140U、D140S）；网络接口介绍

Access and Terminals (AT);34 Mbit/s and 140 Mbit/s digital leased lines (D34U, D34S, D140U, D140S);Network interface presentation