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August 30, 2006
GSM Quad Band Mobile
GSM, the short form of Global System for Mobile Communications, is a leading digital cellular system. GSM mobile phones operate on narrow band Time Division Multi Access (TDMA) system, which allows eight simultaneous calls on the same frequency. It was first introduced in Finland in the year 1991 and by the end of 1997 GSM service became the accepted standard in over 100 countries around the world and is now the de facto standard in Europe and Asia. The TDMA technology is a multi-access digital transmission system by which, multi-users can access a single radio frequency (RF), without any interference. It works on providing individual time-slots to each of the users within each
From GSM Quad Band Mobile
Posted by Ryan at August 30, 2006 08:22 AM
