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The GSM (Global System for Mobile Communications) is a second- generation digital mobile telephone standard using a variation of Time Division Multiple Access (TDMA). It is a mobile telephone using a wireless technology that allow users to communicate with people that are not within their reach.

It is the most widely used of the three digital wireless telephone technologies – CDMA (Code Division Multiple Access), GSM and TDMA.

It operates at either the 900, 1800 or 1,900MHz frequency bands.



The GSM network can be divided into three broad parts

The subscriber carries the mobile station

The base station subsystem controls the radio link with the

mobile station

The network subsystem performs the switching of calls

between the mobile users and other mobile and fixed

network users



  1. State the full meaning of GSM
  2. State how to send messages of GSM

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Information and Communication Technology

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