Standards For Cellular Communications

How to choose a cell phone frequency gsm? Will my phone work in Russia? To answer this question, read the information on gsm and find out which countries there is any frequency. In general, the All standards can be classified into analog and digital. Analog is considered standard first-generation digital – the second one. In each standard, but the distinguishing mark has a numeric (eg GSM-900, GSM-1800, GSM-1900). The number in the title stands for standard operating frequency. Another very important thing: the operating frequency determines the 'range' standard (the smaller the long range), but at the same time, the lower the frequency, the smaller number of Subscribers can 'sit' on a 'saute' (base station). The standard example of this – Moscow: within the capital of mts and Beeline-GSM set station GSM-1800 (high density of subscribers), and in the Moscow region – GSM-900 ('range' to cover larger area) (for normal operation in such circumstances need a phone that works in two standards, the benefit of such phones abound). Also used standard lays imprint on the power of the phone – less 'Range' – less power, longer life batteries, phone radiation is less affected by man. In gsm identified 4 reach: 900/1800 MHz (used in Europe, Asia) Characteristics of GSM-900 GSM-1800 frequencies of the ms transmission and reception of bts, 890 MHz – 915 1710 – 1785 the reception frequency of ms and the transfer of bts, 935 MHz – 960 1805 – 1880 duplex transmit and receive frequencies, MHz 45 95 Number of communication channels 124 374 bandwidth communication channel, 200 200 GSM-standard mobile 900Tsifrovoy in the frequency range from 890 to 915 MHz (from phone to a base station) and from 935 to 960 MHz (from the base habitats to the phone). In some countries, the frequency range of GSM-900 has been expanded to 880-915 MHz (MS -> BTS) and 925-960 MHz (MS Modification of GSM-900, a digital mobile standard in the frequency range from 1710 to 1880 MHz. Features: The maximum radiated power of mobile phones GSM-1800 – 1W, for comparison, GSM-900 – 2W. Longer time of continuous operation without recharging the battery and the reduction of the radio emission, but exposure to radiation of higher frequency is less predictable and more dangerous to humans. High-capacity network that is important for large cities. Ability to use telephones operating in the GSM-900 and GSM-1800 simultaneously. This device operates in GSM-900, but getting into the zone of GSM-1800, switches – either manually or automatically. This allows the operator to better use of frequency resources, and customers – save money by low tariffs. In both networks, the subscriber uses one number. But the use of apparatus in the two networks is only possible in cases where these networks are owned by one company or between companies in different bands, signed a roaming agreement. 850/1900 MHz (used in the U.S., Canada and selected countries in Latin America and Africa), Characteristics of GSM-850 GSM-1900 frequencies of the ms transmission and reception of bts, 824 MHz – 849 1850 – 1910 ms reception frequency and transmission of bts, 869 MHz – 894 1930 – 1990 Duplex frequency spacing of reception and transmission, 45 80 MHz