ETSI ES 200 778-4-2002 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.终端设备要求.第4部分:测试套件结构和测试目的(TSS&TP)规范.挂机与摘机
Access and Terminals (AT); Analogue Access to the Public Switched Telephone Network (PSTN); Protocol over the Local Loop for Display and Related Services; Terminal Equipment Requirements; Part 4: Test Suite Structure and Test Purposes (TSS&TP); On-Hook an