INFORMATION TECHNOLOGY

Introduction:-
GSM means global system for mobile communication. GSM communication widely accepted standard fir digital cellular communication GSM name is established in 1982 to make common in Europeans mobile phone that would formulate specification for pan-European mobile cellular radio system operating at 900mhz.it is established that out of Europe counties will be join the GSM in a partnership. GSM is the set of ETSI standard specifying the developed for a digital cellular service .Europe, Japan, Australia including 85 counties used GSM system. It is widely used in Europe and other part of the world GSM uses of time. Division multiple access (TDMA) and widely used in the digital wireless telephones technology (TDMA, GSM, and CDMA). GSM is compress information and user data.900mhz or 1800 MHz frequency of operates.
GSM mobile technology is first launched in Finland in 1991.690 mobile networks provide GSM Service to 213 countries and GSM service 82.4% of all global mobile connection. China is the largest single GSM marketer, 37 million users’ uses and 145 million from Russia, 83 million from India and 78 million from the USA. GSM network operators talk reaming agreement with foreign operators, user can continuous their work when they are traveling threw different countries SIM card is like home network access configuration may be switched to those will material local access. High speed circuit –switched data (HCSD) is the part of wireless mobile telecommunication. GPRS, EDGE, UMTS united state have adopted GSM network. GSM operate 4 kinds of frequency world wide GSM -850 and GSM-1900are used in Canada which operate 1-9ghz GSM calls are either in voice or data GSM system is high speed circuit switched data allowing the phone to transmitted up to around 40 kbps.

Importance:-
GSM is importance which is providing services requiring multimedia communication-voice, data and images telecel (Portugal) and Mannesmann are providing free voice, mailboxes and a phone answering is provides to customer or subscriber.