日批在线视频_内射毛片内射国产夫妻_亚洲三级小视频_在线观看亚洲大片短视频_女性向h片资源在线观看_亚洲最大网

US EUROPE AFRICA ASIA 中文
China / Society

Metro disruption leads to calls to ban Wi-Fi on train

By Huang Yuli in Shenzhen and Shi Yingying in Shanghai (China Daily) Updated: 2012-11-06 08:24

A subway operator in Shenzhen in Guangdong province is investigating whether passengers' portable Wi-Fi devices were the cause of a brief suspension of metro services on Thursday.

"Unknown signals", as the Shenzhen Metro Group put it, interrupted several trains on the city's Shekou line from 8:15 am to 9:30 am on Thursday, forcing many passengers to transfer to other lines. Others found themselves stranded.

The incident has attracted nationwide attention as more cities in China have started operating subway services. There has been much discussion as to whether portable Wi-Fi devices should be banned on metro lines to ensure their safe operation.

Because of interfering signals, the trains on the Shekou line stalled a number of times under the automatic protection mode or failed to operate at full speed.

Concerns rise over the Communication Based Train Control System - a railway signaling system that uses the telecommunications between the train and track equipment for traffic management and infrastructure control - which may be affected by Wi-Fi signals.

Chen Qi, deputy manager of the Shenzhen Metro, said on Monday that portable Wi-Fi devices may be the cause of the disruption, but there has been no final conclusion.

According to the operator, the Shekou line and Huanzhong line in Shenzhen use the CBTC system.

The incident has been the cause of much concern around the country, as first-tier cities such as Beijing and Shanghai are expanding their metro services, and second- and third-tier cities are building their own subway systems at a brisk pace.

Metro companies in a number of cities approached by China Daily on Monday said they never had services interrupted by unknown or Wi-Fi signals.

Shanghai Shentong Metro Group, the main operator of Shanghai's subway lines, said no signal interference has ever occurred on metros in the city despite metro lines 6 to 11 using the same CBTC system as their wireless communication system.

"But the interference is possible in theory," said Yang Di, a manager at Shentong.

Jia Peng, spokesman for Beijing Subway Operation Co, said the signal system of subway networks operated by the company never experienced problems like the case in Shenzhen and he firmly believes in the safety of Beijing's subway signal system.

"The CBTC system we use is the most widely used signal system in the world and also the most tested," he said.

Despite the confidence of some metro operators, mobile communication experts said it remains a concern that portable Wi-Fi signals can be a potential hazard to subways using CBTC systems.

Contact the writers at huangyuli@chinadaily.com.cn and shiyingying@chinadaily.com.cn

Highlights
Hot Topics
...
主站蜘蛛池模板: 亚洲精品久久久久久久久久久 | 欧美激情bbw | 免费爱爱视频网站 | 中文av在线播放 | 欧美做受高潮中文字幕 | 久久亚州 | 国产精品资源站 | 日韩欧美中文字幕在线观看 | 日日操日日 | 中文字幕在线不卡视频 | 亚洲在线中文字幕 | 久久只有精品 | 欧美色国 | 亚洲视频综合网 | 欧美中文字幕一区 | av中文在线 | 欧美午夜影院 | a在线免费| 手机看片日韩av | 亚洲天堂2016 | 嫩操影院| 欧美性xxxx | 国产999久久久 | 色九九 | 深夜福利一区二区 | 99精品福利视频 | 97中文字幕在线观看 | 男人久久| 性色av一区二区三区 | 亚洲欧美日韩在线播放 | a在线天堂 | 日本a级片在线观看 | 免费成人福利视频 | 欧美日韩一区视频 | 国产成人麻豆 | 成人动漫中文字幕 | 欧美国产一级片 | 秋霞成人午夜伦在线观看 | 黄色影视大全 | 成人毛片在线免费观看 | 少妇精品一区二区三区 |