The Harbin Metro was built in 2008, and some sections of it used the existing "7381" civil air defense project. The overall planning of Harbin Metro is "Nine Lines-Ring", with a total mileage of 340 kilometers. This project has successively implemented six types of shielded and unshielded wiring systems, with more than 3000 information points. Each component of the LINKBASIC six types of system has been strictly designed and produced, and the link and channel performance exceeds the requirements of ISO/IEC11801 and TIA/EIA568 standards. The bandwidth reached 350MHz. After the construction of the Harbin subway project was completed, all the information points were tested by the FLUKE channel, and 100% passed the acceptance.
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