久久久无码人妻精品无码_6080YYY午夜理论片中无码_性无码专区_无码人妻品一区二区三区精99

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
...
久久久无码人妻精品无码_6080YYY午夜理论片中无码_性无码专区_无码人妻品一区二区三区精99

    久久99精品久久久久久国产越南 | 高清成人在线观看| 国产日韩欧美a| 成人精品国产福利| 一区二区三区四区激情 | 3d动漫精品啪啪1区2区免费| 美女www一区二区| 国产欧美日韩三区| 色狠狠色狠狠综合| 免费在线观看视频一区| 久久久精品免费免费| 色香蕉成人二区免费| 日本女人一区二区三区| 久久久影视传媒| 色婷婷综合久色| 美女国产一区二区| 中文字幕亚洲欧美在线不卡| 欧美另类z0zxhd电影| 国产乱码精品1区2区3区| 亚洲美女免费视频| 欧美mv日韩mv国产| 91香蕉视频污| 精品一区二区三区在线观看| 亚洲婷婷在线视频| 日韩视频国产视频| 91碰在线视频| 精品亚洲成a人在线观看| 亚洲欧美视频在线观看| 欧美mv日韩mv国产| 日本精品裸体写真集在线观看| 麻豆国产精品官网| 亚洲色图.com| 26uuu国产日韩综合| 91豆麻精品91久久久久久| 激情av综合网| 亚洲一区二区三区激情| 日本一区二区视频在线| 7777精品伊人久久久大香线蕉经典版下载| 国产乱人伦精品一区二区在线观看| 亚洲午夜av在线| 国产日产欧美一区二区视频| 欧美精品在线观看一区二区| 不卡一区二区三区四区| 久久国产精品色| 亚洲综合激情小说| 中文字幕免费一区| 日韩一本二本av| 欧美亚洲尤物久久| 不卡的电影网站| 久久99在线观看| 午夜电影网一区| 综合久久国产九一剧情麻豆| 久久综合狠狠综合久久综合88 | 色综合夜色一区| 国产一区二区三区香蕉| 五月综合激情日本mⅴ| √…a在线天堂一区| 久久久精品国产免费观看同学| 欧美美女一区二区三区| 色伊人久久综合中文字幕| 豆国产96在线|亚洲| 久久福利视频一区二区| 偷拍一区二区三区四区| 亚洲女人小视频在线观看| 久久夜色精品国产噜噜av| 91精品国产高清一区二区三区| 色诱亚洲精品久久久久久| 成人激情av网| 国产精品亚洲一区二区三区在线| 美女一区二区三区| 午夜影视日本亚洲欧洲精品| 亚洲欧美一区二区三区孕妇| 日本一区二区不卡视频| 久久五月婷婷丁香社区| 91精品国产手机| 欧美日本在线播放| 欧美性受极品xxxx喷水| 色哟哟亚洲精品| 一本久久a久久精品亚洲| 9色porny自拍视频一区二区| 国产风韵犹存在线视精品| 国产综合久久久久久鬼色| 捆绑紧缚一区二区三区视频| 午夜国产精品一区| 五月天国产精品| 亚洲成人午夜电影| 香蕉加勒比综合久久| 午夜精品久久久久久久| 性做久久久久久免费观看| 亚洲国产精品一区二区久久 | 美女视频一区在线观看| 日本欧美一区二区| 秋霞午夜av一区二区三区| 天堂精品中文字幕在线| 日韩中文字幕不卡| 日本aⅴ精品一区二区三区| 日韩 欧美一区二区三区| 日本成人在线网站| 麻豆成人91精品二区三区| 久久er精品视频| 国产一区二区0| 国产成人免费av在线| 国产成a人亚洲精| 成人爱爱电影网址| av午夜一区麻豆| 色综合久久综合网| 欧美在线观看视频一区二区三区| 欧洲亚洲精品在线| 欧美久久久久久蜜桃| 日韩你懂的在线观看| 欧美精品一区二区三区很污很色的| 久久无码av三级| 国产精品嫩草久久久久| 亚洲少妇中出一区| 亚洲午夜私人影院| 蜜臀av一区二区在线免费观看| 韩国成人精品a∨在线观看| 国产aⅴ综合色| 91麻豆国产福利在线观看| 欧美系列一区二区| 欧美一区二区不卡视频| 久久久久久一二三区| 国产精品乱子久久久久| 一区二区三区日韩精品视频| 亚洲gay无套男同| 看电视剧不卡顿的网站| 懂色av一区二区三区免费观看| 99久久99久久久精品齐齐| 欧美综合天天夜夜久久| 欧美一级二级三级蜜桃| 久久午夜老司机| 亚洲女人的天堂| 日韩精品乱码av一区二区| 韩国av一区二区| 99re66热这里只有精品3直播 | 豆国产96在线|亚洲| 日本道在线观看一区二区| 欧美精品第1页| 久久久久久久电影| 一区二区三区欧美亚洲| 免费看日韩精品| 成人免费视频网站在线观看| 欧美亚洲愉拍一区二区| 精品国产乱码久久久久久久 | 午夜激情综合网| 国产精品一区二区在线播放 | 欧美性色黄大片| 精品国产露脸精彩对白| 亚洲欧美日韩中文播放 | 日韩午夜激情免费电影| 国产精品久久毛片av大全日韩| 亚洲午夜激情av| 国产大陆精品国产| 欧美日韩国产一级二级| 国产婷婷色一区二区三区在线| 一区二区成人在线| 国产乱子伦一区二区三区国色天香| 91小视频在线观看| 精品美女被调教视频大全网站| √…a在线天堂一区| 久久成人综合网| 在线视频综合导航| 久久免费看少妇高潮| 亚洲成人免费在线观看| 高清国产一区二区| 欧美一级日韩一级| 亚洲欧美另类在线| 国产精品一二三区| 欧美巨大另类极品videosbest| 国产精品无码永久免费888| 欧美aⅴ一区二区三区视频| www.99精品| 精品国产三级电影在线观看| 一区二区三区影院| 国产a区久久久| 日韩精品一区二区三区四区 | 成人一区在线观看| 欧美一级视频精品观看| 一区二区三区免费在线观看| 国产福利一区在线| 日韩一级欧美一级| 亚洲午夜电影在线观看| 北条麻妃国产九九精品视频| 精品久久久久久久久久久院品网 | 麻豆精品久久久| 欧美性受极品xxxx喷水| 中文字幕制服丝袜成人av| 精品一二三四区| 91精品国产高清一区二区三区| 亚洲精品免费电影| 成人免费福利片| 久久蜜桃一区二区| 美国av一区二区| 欧美福利视频导航| 亚洲一区免费视频| 91麻豆高清视频| 国产精品国产自产拍高清av王其| 国产一区二区三区久久悠悠色av| 欧美一区二区三区色| 午夜av电影一区|