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Domestic Long-distance Backbone Transmission Network |
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Unicom Operating Company owns a long-distance optical transmission network that covers the whole country (except Tibet), and is technologically advanced, secure, reliable and competitive. Its transmission system mainly adopts 160-wave DWDM system, and DWDM devices with a single-wavelength transmission rate of 10Gbps or 2.5Gbps. This network is mainly based on:
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Two-way SDH fiber loop, self-heeling system, once fiber is cut off, routing can be changed automatically to ensure unblocked circuit. |
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DWDM technology, which allows transfer of multiple wavelength-transmission signals on one fiber, thus improves transmission capacity. |
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DXC system, which is special high-speed digital channel cross connection device, allows more efficient management of service routing and path organizing. |
Unicom Operating Company's long-distance backbone transmission network can meet the high quality and high reliability bandwidth needs for its operation of integrated services, and can provide circuit and fiber sale and lease services for other telecom operators and group customers.
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| Transmission Networks Linking with Foreign Countries and Hong Kong |
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While constructing domestic transmission network, Unicom Operating Company began to take part in international undersea cable construction in order to develop international service and adapt to the competitive situation of international telecom development. Unicom Operating Company has participated in APCN2 sublarine cable consortium and opened fifteen 155Mbps international half circuits and two-way circuits. The leased international circuit bandwidth is 581Mbps. To fit in with the Chinese mainland-Hong Kong service needs, Unicom Operating Company has opened two 2.5Gbps transmission systems with Reach and other companies of Hong Kong. By the end of June 2002, Unicom Operating Company had owned about 7.5Gbps international circuit bandwidth.
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| Broadband Access Network |
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Unicom Operating Company?s broadband access network provides customers with integrated data, image and voice access, can realize tele-education, tele-medicine, VOD and other services, and can realize broadband networking by better utilizing FTTB and FTTC. In regard to broadband access network construction and solving ?last mile? access, Unicom Operating Company is implementing ?ten thousand buildings project? (i.e., access to buildings densely populated by high-end customers like high-grade office buildings and hotels in 119 prefecture-level cities throughout China). | |
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