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上海光同步传输网主环系统投入运行上海市电话通信的传输技术有了重大突破，一个达到国际先进水平的光同步传输网（ＳＤＨ）主环系统，经过工程技术人员的紧张施工，已于最近建成并投人运行，浦东新区ＳＤＨ子环也开通运行。这个光同步传输网主环系统，传输速率可达２．Ｓ...
Shanghai Optical Synchronous Transmission Network Main Ring System Put into Operation The transmission technology of Shanghai telephone communication has made a significant breakthrough. An optical synchronization transmission network (SDH) main ring system which has reached the international advanced level has been recently constructed by the engineers and technicians. Built and put into operation, SDH sub-district in Pudong New Area also opened. This optical synchronous transmission network main ring system, the transmission rate of up to 2. S ...