1)ringer test panel,振铃器测试盘2)signal(l)ing-equipment test,振铃器测试3)test oscillator panel,测试用振荡器盘4)Ring Back Test Function,回振铃测试功能5)ring detection,振铃检测6)service oscillator,测试振荡器
用法例句
This paper analyzes the ring detection,DTMF codec and power line carrier and the realization of the principle of the program.
