通讯技术分为有线通讯和无线通讯两大类，安全防范技术中的报警通讯是利用现代化的公共电话网、专用无线通讯网、因特网等来传递报警信息，它与话音通讯有所不同，其特点是它所传递的信息量较少，报警信息重复报告，占用信道时间较长，因此报警通讯的设备和线路大多使用多... Communication technology is divided into two categories: wired communication and wireless communication. The alarm communication in the security precaution technology uses the modern public telephone network, special wireless communication network and the Internet to transmit alarm information. It is different from voice communication in that it is characterized by The amount of information it passes is less, the alarm information is repeatedly reported, occupy the channel for a long time, and therefore most of the devices and circuits for alarm communication use more ...