ETSI TR 103 000-4-1-2003 接入和终端(AT).公共电话网的模拟接入.协调终端接口的标准的建议注释.第4部分:CEC决议的相关信息.第1子部分:通用回路稳定状态要求(版本1.1.1)
Access and Terminals (AT); Analogue Access to Public Network; Advisory Notes to Standards harmonizing terminal interface; Part 4: Information arising from CEC decisions; Sub-part 1: General loop steady state requirements (V1.1.1)