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GSM (Global System for Mobile Communications: originally from Groupe Spécial Mobile) is the most popular standard for mobile telephone systems in the world. The GSM Association, its promoting industry trade organization of mobile phone carriers and manufacturers, estimates that 80% of the global mobile market uses the standard.[1] GSM is used by over 3 billion people across more than 212 countries and territories.[2][3] Its ubiquity enables international roaming arrangements between mobile phone operators, providing subscribers the use of their phones in many parts of the world. GSM differs from its predecessor technologies in that both signaling and speech channels are digital, and thus GSM is considered a second generation (2G) mobile phone system. This also facilitates the wide-spread implementation of data communication applications into the system. Enhanced Data Rates for GSM Evolution (GSM EDGE) is a 3G version of the protocol.

Courtesy: Wikipedia.org

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Posted by justfawad

GSM is abbreviated as a Global Systems for Mobile Communication. GSM is a 2G technology a digital communication technology that operates in 800, 900 and 1800/1900 frequency bands. GSM is a cellular technology that have a channel of 200khz with TDMA technique and has a limited data rate supported featire of sms.

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Posted by sizzlingfauji

GSM was designed to be platform-independent. The GSM
specifications do not specify the actual hardware requirements,
but instead specify the network functions and interfaces in
detail. This allows hardware designers to be creative in how they
provide the actual functionality, but at the same time makes it
possible for operators to buy equipment from different suppliers.
The GSM recommendations consist of twelve series which are
listed in the table below These series were written by different
working parties and a number of expert groups. A permanent
nucleus was established in order to coordinate the working
parties and to manage the editing of the recommendations. All
these groups were organized by ETSI.

GSM PHASES
In the late 1980s, the groups involved in developing the GSM
standard realized that within the given time-frame they could not
complete the specifications for the entire range of GSM services
and features as originally planned. Because of this, it was
decided that GSM would be released in phases with phase 1
consisting of a limited set of services and features. Each new
phase builds on the services offered by existing phases.

The GSM network is divided into two systems. Each of these
systems are comprised of a number of functional units which are
individual components of the mobile network. The two systems
are:
· Switching System (SS)
· Base Station System (BSS)
In addition, as with all telecommunications networks, GSM
networks are operated, maintained and managed from
computerized centers.

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Posted by saqlain231

GSM (Global System for Mobile communications: originally from Groupe Spécial Mobile) is the most popular standard for mobile phones in the world. Its promoter, the GSM Association, estimates that 80% of the global mobile market uses the standard.[1] GSM is used by over 3 billion people across more than 212 countries and territories.[2][3] Its ubiquity makes international roaming very common between mobile phone operators, enabling subscribers to use their phones in many parts of the world. GSM differs from its predecessors in that both signaling and speech channels are digital, and thus is considered a second generation (2G) mobile phone system. This has also meant that data communication was easy to build into the system.

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Posted by waqasahmad

Easy way to understand GSM just read the module CP02: Introduction to Digital Cellular of Motorola

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Posted by HamidAliKhan

GSM is a digital mobile telephone system that uses a variation of TDMA & uses frequency bands are 1800 and 900 MHZ.

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Posted by Hash007

GSM (Global System for Mobile communications: originally from Groupe Spécial Mobile) is the most popular standard for mobile phones in the world. Its promoter, the GSM Association, estimates that 82% of the global mobile market uses the standard. GSM is used by over 3 billion people across more than 212 countries and territories.Its ubiquity makes international roaming very common between mobile phone operators, enabling subscribers to use their phones in many parts of the world. GSM differs from its predecessors in that both signaling and speech channels are digital, and thus is considered a second generation (2G) mobile phone system. This has also meant that data communication was easy to build into the system

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Posted by HamidAliKhan

Yes the GSM is based on both TDMA and FDMA.

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Posted by waqqas1

Hi friends as of my knwoledge, I accept the answer given except GSM is based on TDMA Technology b/c its based on both TDMA and FDMA,It uses Gaussian Minimum shift keying as modulation technic. To expalin above concept we need to explain from basics of GSM i.e 2.048 Mbps link,how it is devided in both frequency and timely manner.Thanks for giving opertunity to express my views

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Posted by prsr51

Hello friends! Global System for Mobile Communications (GSM) - GSM is a digital cellular phone technology based on TDMA that is the predominant system Europe, the Middle East, Africa, Asia and in parts of America and Canada. First introduced in 1991, the GSM standard has been deployed at three different frequency bands: 900 MHz, 1800 MHz and 1900 MHz. GSM 1900 is primarily deployed in North America. Named after its frequency band around 900 MHz, GSM-900 has provided the basis for several other networks using GSM technology. GSM uses narrowband TDMA which allows eight simultaneous calls on the same radio frequency. Along with CDMA and TDMA it represents the second generation of wireless networks. Thanks.

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Posted by jaren