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Radio Backup | 无线电备份

Technology that allows for the installation of a radio alarm backup system without telephone lines. This would a second signalling path that would act as a backup to send alarm signals by radio to the central surveillance monitoring station if the PSTN telephone line is not available.

允许技术上安装一个无线电报警备份系统从而不需要电话线。这样为系统添加了第二条信号传输通道，并作为备份通道，当PSTN电话线无法使用时将报警信号通过无线电发送给中央监控站


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