Why use a mobile phone signal jammer in the examination room?
Every time an important exam is encountered, most schools will choose to use the mobile phone signal jammer in the examination room, which may affect the signal of the surrounding environment. Therefore, in order to ensure the smooth signal of the surrounding areas of the campus, the major operators will not be affected by the cell phone signal jammerin the examination room. , The operator tests the signal at the entrance and exit of each test site, and upgrades the software and hardware of the surrounding base stations to ensure the communication needs during the test. Do your best to ensure the smooth communication of mobile phones in areas other than the examination room. In every exam, there are always some students who cheat for personal gain and take risks. At this time, the school will adopt the method of shielding all mobile phone communication signals in the examination room. Therefore, it is normal for the classroom to have a mobile phone signal jammer in the examination room. At the same time, radio monitoring equipment is installed outside the examination room to cooperate with the mobile phone signal jammer in the examination room to monitor the radio wave signals from unknown sources in the classroom in real time.
The working principle of the mobile phone signal jammer used in the college entrance examination is to annihilate useful electromagnetic wave signals in a large number of useless signals. Under normal circumstances, when we make a call to communicate with the outside world, the radio wave signal sent by both parties is transmitted through the connection between the mobile phone and the base station. Once the mobile phone signal jammer in the examination room is turned on, a "protective net" will be formed around it, and the surrounding signals will be completely isolated from the outside world. At this time, the mobile phone inside cannot receive the signal from the outside, and the base station cannot receive the signal of the mobile phone, and the connection between the two is cut off. At this time, the mobile phone is mainly in the state of searching for no network, no signal, etc. Naturally, functions such as making calls, sending messages, and surfing the Internet cannot be used to achieve the purpose of shielding the test environment signal.
South Korea's 5G auction officially launched, who will win the future national high-speed wireless network? The answer may be revealed in the competition between KT and LGU+.
The Ministry of Science, Technology and ICT will auction 280MHz of spectrum in the 3.5GHz band and 2,400MHz of spectrum in the 28GHz band for 3.3 trillion won ($3.04 billion).
Operators are very interested in the 3.5GHz band, and the 280MHz bandwidth will be divided into 28 10MHz spectrum blocks for sale, but each operator can only obtain 100MHz of 3.5GHz band spectrum at most. SK Telecom plans to occupy 100MHz of spectrum, and the remaining 180MHz will be contested by KT and LGU+.
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