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Shuozhou-Huanghua Railway extends 600 kilometers from Shenchi (a key coal mine base in Shanxi Province) to Huanghua Harbor (one of the busiest export harbors in neighboring Hebei Province). This railway is the second largest channel for transporting coal resources from west to east, guarantees sufficient energy supplies in the coastal regions of eastern and southeastern China, and increases shipment of coal exports.
Shuozhou-Huanghua Railway selected Huawei to roll out a reliable and simplified solution by reconstructing its transmission network for enhanced reliability and simplified O&M. The solution implemented a unified platform to carry out all businesses, meets the requirements of railway on reliability and ensures the long-term stable service running on the system.
The Shuozhou-Huanghua Railway originally used a Multi-Service Transmission Platform (MSTP) to bear the signaling, monitoring, and voice services. Every service's data bandwidth ranged from 2 Mbit/s up to 100 Mbits/s Fast Ethernet (FE). After railway subsystems had been upgraded and reconstructed, faster and optimized networks, such as Long-Term Evolution (LTE) and video surveillance system, would be needed. These systems required more diversified railway services with advanced network features. The challenges facing the railway came in the following aspects:
Higher bandwidth requirements imposed heavy loads on the original network. New services also required a more flexible and efficient IP network. However, the traditional MSTP had low transmission efficiency.
An unstable and increasingly unreliable network affected security. In order to improve its security, all subsystems should have to be separated so that all services could be transmitted efficiently and securely.
Spare parts and the maintenance service of the older network were at the end of life, which negatively impacted the network O&M.
Huawei rolled out a reliable and simplified solution for reconstructing the railway's transmission network.
Huawei deployed a comprehensive transmission network: 10 Gbit/s backbone layer, 2.5 Gbit/s aggregation layer that could easily be upgraded to 10 Gbit/s.
Huawei OptiX OSN 7500 and OptiX OSN 3500, as the widely used intelligent optical transmission switches, provided better performance for cross-connection capability and Ethernet access. In the meantime, 40 percent of the devices' capacity could be spared for future expansion. The Ethernet access boards have a higher port density to efficiently save the slot resources, and increase the available utilization rate of bandwidth because of the grooming capability base in VC12/VC3/VC4 granulation.
Huawei provided multiple protection mechanisms to improve system stability and reliability. All of the key boards such as cross-connection boards, main control units, and power supply units were deployed in 1+1 hot standby mode. The secondary power supply for the key boards provided an uninterrupted power system. The network protection ensured that the service in a faulty node could be switched within 50 ms. The OSN-series devices also might offer an intelligent optical network platform that could enable the existing live network to evolve toward an automatically switched optical network, further improving network reliability.
The OSN-series equipment shared the same service boards. As a result, fewer spare parts were needed in the whole communication network and maintenance would be more cost-saving. Meanwhile, Huawei's iManager U2000 could uniformly manage all devices and services in this network.