GSM - 2G Digital Technology

GSM Stands for Global System for Mobile communications. Its the most widely used 2G

Its promoter, the GSM Association, estimates that 82% of the global mobile market uses the standard. GSM is used by over 2 Billion people across more than 212 countries and territories.
One of the main feature of GSM is the GLOBAL Roaming between mobile phone operators which allows the subscribers to use their cellphones in more than one country!! technology in the world right now.

GSM networks operate in four different Frequency Range or Bands:
Most GSM networks operate in the 900 MHz or 1800 MHz bands. Some countries in the Americas (including Canada and the United States) use the 850 MHz and 1900 MHz bands because the 900 and 1800 MHz frequency bands were already allocated.

Modulation: The Modulation used in GSM is GMS, a kind of continuous-phase frequency Shift Keying.


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