According to the different transmission lines used in the system, at present, wired intrusion detection and alarm systems can basically be divided into two categories. One is a wired alarm system that uses dedicated lines for transmission , and the other is a networked alarm system that uses public telephone networks for transmission .
Wired alarm system using (RS485) dedicated line transmission
The so-called special line batch is a transmission line laid for a certain wired alarm system. The only task of the dedicated line is to complete the transmission of all information between the alarm detector, the alarm controller and the upper level alarm center. In general, for small and medium-sized wired alarm systems, or in a small area of ​​self-contained system, do not enter the wired alarm system of large-area networks to install more dedicated lines as transmission lines.
However, when a multi-user, large-scale wired network alarm system needs to be established, it is not recommended.
Networked alarm system using public telephone network transmission
In this system, a dedicated transmission line is generally used between the alarm detector and the alarm controller, but the transmission line between the alarm controller and the upper level alarm center uses the existing public telephone communication network. With the popularization of telephone communication, it is very convenient to use an existing communication telephone network as a transmission line of an alarm system. In this way, the alarm controller can be installed in any unit or department that has a telephone line. As soon as there is a police situation, not only the user's duty center or security department can receive an alarm signal, but also can immediately receive an alarm through the telephone switching network to the upper level alarm center. This kind of computer network alarm system that utilizes the telephone line transmission is currently developing very rapidly in technology and its applications are becoming more and more extensive. Obviously, the use of telephone communication lines as transmission lines facilitates the networking and socialization of security alarm systems.
The wired alarm system is suitable for situations where the alert site is not too far from the alarm controller of the duty center. At the same time, it is generally necessary to take into account its installation line in advance of the design of the house building. If possible, it is better to conceal the installation, so that there will be installation and use of alarm equipment in later stages, and it will not affect the appearance of the building.
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