Brief Analysis of Development Status of PSTN Telephone Network Alarm System

The application of the telephone network to the alarm is a historically inevitable choice. In the early days of the development of the alarm system, the telephone line was the best and most popular communication network. What is the status of the telephone network today?

The PSTN system is a circuit-based communication system. That is, when a communication is to be established, both parties of the call must have a physical connection, and thus it cannot be used as a normal online system. In addition, the purpose of the telephone design is also limited to voice transmission. The bandwidth requirement for such transmission is not high, and the amount of information that can be loaded is not much.

The above two characteristics determine that the alarm center system built based on the PSTN telephone system is slow in information transmission (the dial-up and layer exchanges take a long time to establish the connection, and its limited bandwidth also hinders the transmission of high information volume). Therefore, based on PSTN telephone system, currently approved image alarm verification and query to front-end users are difficult to achieve (central query to dial to each customer, slow, high cost).

With the improvement of people’s security awareness and the improvement of security requirements, telephone alarm systems are increasingly being stretched. In addition to the limitations of its own technical weaknesses, what is more important is the rapid impact of the emergence of other advanced communication technologies.