The last time we had a topic about why we should say no to cell phones in the gas station, now we are concentrating on Metro.
The density of users of mobile phones in the subway is so great, almost all passengers play their phones while training. Absolution, it forms a large signal disturbing magnetic field in the subway and can program the entire control orders. So a great risk and Threat to the running metro. But I think it’s impossible to get permission from Wireless Telecom Carries, you know, that will reduce their profits. In fact, Shenzhen Metro is still being rejected by these Wireless Telecom Carries. They would be better off adopting good measures — signal jammer. Cell phone signal in the running subway train is the main work of the cell phone jammer.
In early 2012, Shenzhen Metro Group found the problem and applied to Shenzhen Communications Authority for 3G 3G and WiFi signal to stop across Shenzhen Metro lines. Many lines of the running Metro suffered emergency braking due to the system being attacked by unknown signal source. Metro trains They had to switch on their automatic protection functions so that they could not temporarily continue running at high speed. The event raised public concern about the safety of metro operations.
After the investigation, they found the real reason. Portable wifi information channels of passengers who may use the same with subway will interfere with each other. And we know that most smartphones can be set as wifi transmitters, most advanced CBTC from CASCO companies, safest and highly efficient, it is hard to say, you know, such a high development speed of technology, it can be new Cause problems on CBTC system with the new arrival of wireless transmitters.
Back to signal jammer, the one – 12 antennas 28.5W high power Wifi GPS VHF UHF Lojack 3G 4G all bands adjustable signal blocker, blocks cell phone, GPS and wifi signal.Most of the smart phone use 3g and 4g network with Wifi Bluetooth Function.Cell phones are banned by base stations and in the situation of the dead on the move – direct ways to maintain the security of the CBTC system. Sure that you still need permission from a related department, anyway, it might find out the problem with none of these stores from Wireless Telecom Carries.