说明：
BackgroundData Communication System is the network platform of tram operation and customer service, it is also the nerve system of normal running, which ensured the train running is fast, safe, and on time. Normally, communication system should ensure the train running efficiently, provides goodquality service； It should be changed to command communication system for rescue and accident handling under abnormal condition. Tram communication system is consists of communication transmission system, private/official telephone system(both),wireless communication system, time system, information network system, CCTV, broadcasting system, PIS system, integrated dispatching system, power supply and lighting protection and grounding system, as well as communication lines, that is a comprehensive se...