Telecommunications technology noun explanation: GSM, GSM900 and GSM1800
Http://www.sina.com.cn July 24, 2004 23:06 Sina Technology
GSM is full name: Global System for Mobile Communications, Chinese is a global mobile communication system, commonly known as "global pass", developed digital mobile phone network standards developed by Europe, its development purpose is to use a mobile phone network standard around the world, let Users can travel around the world using a mobile phone. The GSM system includes several frequency bands such as GSM 900: 900MHz, GSM1800: 1800MHz and GSM-1900, 1900MHz. There are several important features of the GSM system: the anti-theft copy has a good power, the network capacity is large, the mobile phone number resources are rich, and the call is clear.
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Clear, strong stability is not easy to interfere, the information is sensitive, the call is small, and the mobile phone is low. At present, the main two major GSM systems in the world are GSM 900 and GSM1800, and because of different frequencies, the applicable phones are not the same. The former has time to develop, more countries used, and the latter has developed late, and there are fewer uses. In terms of physical properties, the former spectrum is low, the wavelength is long, the penetration is poor, but the transmission is far, while the mobile phone is transmitted, the power consumption is large, so the standby time is short; and the latter spectrum is more High, the wavelength is short, good to penetrate, but the transmission is short, the transmission power of its mobile phone is small, and the standby time is longer. GSM900 and GSM1800 Characteristics Comparison Table Frequency Section: GSM900 / GSM1800 Electric Wave Penetration: Weak / Strong Suitable Area: Suburbs / Downtown Same Area Required Base Station: Less / Multi-confidentiality: Jia / Jia
