Telephone refers to the telephone which is connected to the telephone switchboard. The telephone exchange is a switch controlled by an electronic computer, which controls the switching action of the switch in a pre programmed program. Compared with the telephone of general electromechanical switch, the program controlled telephone has the advantages of fast connection speed, high service function, high exchange efficiency, clear sound and reliable quality.
Ji'nan telephone exchange system called digital switches, usually refers to switching equipment for switched telephone network, it takes place the computer program control telephone. Digital switches are divided into long distance switches, local switches and so on. There are also special types for signaling networks and smart networks. The basic functions of digital switch are: subscriber line access, relay connection, billing, equipment management and so on.
Ji'nan telephone exchange system to send telephone dial tone of the user, the pulse signal or DTMF signal receiving phone, and then complete the connection from the calling to the called number, called number could be in the same switch may also be in a different switch. After completion of the connection, the switch will remain connected until one of the communication parties is detected.
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