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Beijing subway safe from Wi-Fi router signals

By Zhang Hui (Global Times)

10:40, November 07, 2012

Beijing Subway Company Monday said the capital's subway lines have not encountered any operational problems caused when passengers attempt to connect to external Wi-Fi routers, after media reports said it resulted in the malfunction of Shenzhen metro lines last Thursday.

Jia Peng, spokesman for Beijing Subway Company, which runs 15 out of the city's 17 subway lines, said he doubted the truth of the reports.

"So far, there have been no similar cases on Beijing's subway," Jia said.

Beijing's subway system shares the same Communications-Based Train Control (CBTC) signal control system with Shenzhen metro lines, according to Jia.

"The CBTC signal system is a developed and mature radio telecommunication technology that is widely adopted on most metro lines in the world," Jia said. But he did not know whether Wi-Fi signals could affect a train's signal.

Many trains on the Shekou line of Shenzhen subway were brought to an emergency stop last Thursday between 8:15 am to 9:30 am, as the control signal was affected by undefined outside signals, the Shenzhen Metro Company posted on its microblog.

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