GSM is developed in 1982 by Groupe Speciale Mobile. Global Service Mobile (GSM) communication is one of the most popular second generation mobile communication standard which basically uses cellular network.
GSM operates in frequency ranges such as 900MHz, 1800 MHz and 1900 MHz. Easy international roaming in GSM network is enabled by triband phones operating in GSM 900/1800/1900.GSM gives integrated services for data as well as voice.
Basically Services provided by GSM are divided into three different types such as teleservices, supplementary services and bearer service which are as shown in following figure.
Teleservices are the services provided to user by mobile service network. It is a point-to-point service which means a service is from one terminal provided to another terminal. Teleservices provides many services some of them are SMS, MMS, Fax, Voice communication at full data rate 13.4 kbps, emergency numbers for emergency calls etc.
Whereas GSM also provides some additional services that are available by subscription only called as supplementary services. Caller line forwarding, caller line identification at connected terminal, closed group formation, multiparty groupings, call holding, l waiting and barring calls from specified numbers or groups etc are some of the examples of supplementary services.
Bearer services are the services which are responsible for transmission of voice and data in terms of digital format over the network. Bearer services are transparent which uses only physical layer protocol for transmission or non-transparent which uses physical layer, data link layer and flow control layer protocol for transmission. Bearer services are also categorized depending on synchronous data transfer, asynchronous data transfer or synchronous data packet transfer.
GSM operates in frequency ranges such as 900MHz, 1800 MHz and 1900 MHz. Easy international roaming in GSM network is enabled by triband phones operating in GSM 900/1800/1900.GSM gives integrated services for data as well as voice.
Basically Services provided by GSM are divided into three different types such as teleservices, supplementary services and bearer service which are as shown in following figure.
Teleservices are the services provided to user by mobile service network. It is a point-to-point service which means a service is from one terminal provided to another terminal. Teleservices provides many services some of them are SMS, MMS, Fax, Voice communication at full data rate 13.4 kbps, emergency numbers for emergency calls etc.
Whereas GSM also provides some additional services that are available by subscription only called as supplementary services. Caller line forwarding, caller line identification at connected terminal, closed group formation, multiparty groupings, call holding, l waiting and barring calls from specified numbers or groups etc are some of the examples of supplementary services.
Bearer services are the services which are responsible for transmission of voice and data in terms of digital format over the network. Bearer services are transparent which uses only physical layer protocol for transmission or non-transparent which uses physical layer, data link layer and flow control layer protocol for transmission. Bearer services are also categorized depending on synchronous data transfer, asynchronous data transfer or synchronous data packet transfer.
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This article is the topic of unit " Communication Technologies-II " from RTMNU MBA 3 rd sem IT syllabus notes.Further topics will be covered in upcoming blogs For more notes you can also refer to other links as given below :
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GSM stands for Global System for Mobile Communication.GSM is the most popular standard for mobile telephone systems in the world. It is the European standard for digital cellular service that includes enhanced features.
ReplyDeletedigital signature softwareMay 17, 2011 at 2:22 AM
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