Traffic signal controller is the glue traffic light device, is used to control and adjust the traffic lights. So, don't assume that traffic light is one of the biggest traffic boot device, to say the signal is the commander-in-chief of the lamp.

The traffic signal is also a demand of modulation, like computer modem, commonly known as the cat in the box. Traffic signal modulation is also USES information system integration skills. Its skills program is to select a network computer as a server, the server software and voice function of modem connected, check on its user information, message processing and call for database; Other computer local area network (LAN) as the client device client software; Choose double voice modem structure will take voice function of modem is connected to a PSTN telephone network. Server through the server software for call control and network communication, the client end client software computer local area network (LAN), computer local area network (LAN) - such as PSTN telephone network information transmission. Choose here is the client and the server skills, but also demand into must area traffic signal, like the same local area network (LAN), each traffic signal tube where the traffic lights, this is a good area of the division.