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在电信、电力等信息化建设较早的行业,一般会存在ATM和IP两种技术的网络,但是像中山电力并存ATM、SDH和IP技术的通信网并不多见。广东省
In telecom, electric power and other information technology industries earlier, ATM and IP generally exist two kinds of technology networks, but like Zhongshan coexistence of ATM, SDH and IP communication network technology is rare. Guangdong Province