ETSI EN 300 659-3-2001 接入和终端(AT).公用交换电话网(PSTN)的模拟接入.显示(及相关)业务的本地回路用户线协议.第3部分:数据链路消息和参数编码(版本1.3.1)
Access and Terminals (AT); Analogue Access to the Public Switched Telephone Network (PSTN); Subscriber Line Protocol over the Local Loop for Display (and Related) Services; Part 3: Data Link Message and Parameter Coding (V1.3.1)