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Public Switched Telephone Network (PSTN) | 公共交换电话网

The PSTN consists of telephone lines, fiber optic cables, microwave transmission links, cellular networks, communications satellites, and undersea telephone cables, all interconnected by switching centers, thus allowing most telephones to communicate with each other. Originally a network of fixed-line analog telephone systems, the PSTN is now almost entirely digital in its core network and includes mobile and other networks, as well as fixed telephones.

In an alarm system, this is a method (albeit outdated) of sending signals to an ARC or a TAP server.

PSTN包括电话线，光纤电缆，微波传输链路，蜂窝网络，通信卫星，与海底电话电缆，所有互连通过交换中心包括移动和固定电话，从而允许在世界上的任何电话与任何其他终端通信。最初是固定线路的模拟电话系统的网络，PSTN的核心目前几乎已完全数字化。

在一个报警系统内，PSTN能将信号发送给一个接警中心或者一个TAP服务器。


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