The exponential growth of smart computing services has brought dual challenges of flexible scheduling and complex operations and maintenance to transport network. When large bandwidth, low latency, and computing network collaboration become standard for services, the traditional operation and maintenance control model can hardly meet the refined management needs of new such as 400G and precise identification and scheduling of services. Based on this critical node, under the guidance of the Group, Hubei Mobile and FHome Communication have jointly submitted a dazzling answer, successfully completing the pilot application of key technologies of intelligent optical networks based on digital twin in the field recently. Breakthrough progress has been in the intelligent operation and maintenance field of the wide-area 400G computing interconnection scenario, marking the official entry of optical networks into a new era of "highspeed intelligent". This pilot focuses on the three major computing circles in Hubei, namely Wuhan, Xiangyang, and Yichang, the core of the three major computing circles in Hubei, deploying 4 OXC sites and 31 OA sites, and carrying the latest C L integrated optical layer, laying a solid foundation for the stable operation and intelligent management of 400G high-bandwidth services. In the pilot process, the two sides focused on the operation maintenance pain points of the 400G scenario, deeply integrated AI, digital twin, and other intelligent technologies into the OTN network system, and achieved a leap in operation maintenance capabilities through three key breakthroughs: Iterative optimization of scheduling algorithms, precise matching of the characteristics of large traffic and high reliability of 400G services, building a more efficient resource scheduling logic. Defining open northbound API interfaces, breaking data islands, and achieving real-time monitoring and flexible regulation of the end-toend status of 400G services. Enhancing the intelligent empowerment of the optical layer, with the core of digital twin, through the optical layer perception and capability to construct a virtual mirror image of the network's full life cycle, to identify potential risks such as 400G signal attenuation and link interference in advance, to superimpose the ASON intelligent optical layer automatic re-routing function, to promote the transformation of operation and maintenance mode from "passive repair" to "active prevention. As the core engine of this technical breakthrough, the deep application of digital twin technology has promoted a dual increase in operation and maintenance efficiency and reliability in the 40G scenario: In the business opening link, relying on intelligent planning tools driven by digital twin, the opening cycle of 400G high-bandwidth business has greatly shortened, achieving "immediate opening". In the fault handling link, through the intelligent traceability and simulation analysis of fault digital twin models, the fault positioning accuracy 400G links can be precisely to the section, and the troubleshooting time is compressed by more than 50% compared with traditional methods. In the network link, based on the real-time synchronized network health assessment data of digital twin, the system can automatically adjust 400G signal parameters to ensure that the link is always the optimal state, and the bandwidth utilization rate is increased by 15%-20%. The success of this pilot not only marks that the intelligent operation and maintenance of the OTN network has officially entered the L4 level, providing a replicable operation and maintenance solution for the large-scale application of 400G and other highbandwidth services, but also breaks the bottleneck of operation and maintenance of 400G optical networks with digital twin technology, setting a new benchmark for the construction of transmission networks the digital economy era. In the future, the two sides will continue to deepen technology iteration and promotion, and support the development of new businesses such as smart computing and cloud with a smarter network base, injecting "optical" power into the high-quality development of the digital economy
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