Gsm Overview; Preface; System Architecture - Motorola RAZR V3 - Cell Phone 5 MB Repair Manual

V3-Razr Repair Manual
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 aptly-named GSM1900 are competing against a plethora of other
standards. As a result of this, the original and most widely-used GSM
frequency implementation is also becoming known as GSM900, and DCS1800
is also known as GSM1800. However, although the physical frequencies used
differ, the protocols and architecture remain the same.

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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