Technology
GSM overview
Preface
This page discusses the GSM mobile telephony system, which is increasingly popular and established throughout the world. The term GSM usually means the GSM standard and protocols in the frequency spectrum around 900MHz.
There is also DCS1800 - GSM protocols but at different air frequencies around 1800 MHz - and in the United States, where spectrum for Personal Communication Services (PCS) was auctioned at around 1900MHz, operators using the
System architecture
Figure 4 below shows the GSM system architecture, which consists of the switching system, the base station system and the user equipment.
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