公众交换电话网 meaning in Chinese
pstn public switched telephone network
tn public switched telephone network
Examples
- Pstn public switched telephone network
公众交换电话网 - Alarm systems - alarm transmission systems and equipment - requirements for systems with voice communicators using the public switched telephone network
报警系统.警报传输系统和设备.使用公众交换电话网的声讯系统要求