Witura WT-9001 IP65 Especificaciones descargar pdf (Pagina 17)

CHAPTER 1

INTRODUCTION

1.1 Background

The Global System for Mobile Communication (GSM) is the most popular

standard for mobile phone in the world. GSM service is used by over 2 billion people

across more than 212 countries and territories. Cell radius varies depending on antenna

height, antenna gain and propagation condition from a couple of hundred meters to a

several tens of kilometers. The growth in the internet industry is immense and along

with this trend wireless communication has rapidly gained wide acceptance, especially

the cellular system such as GSM . Mobile terminal will the major main machine

interface and not PC’s anymore. Mobile telephony, presently superseding wired

telephony, has become one of the most convenient information exchange tools since the

implementation of the GSM standard in the early 1990ies [1].

The Short Messages Services (SMS) in GSM allows amongst other the

transmissions of short text messages to mobile phones. In cases of an emergency the

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Witura WT-9001 IP65 Especificaciones Pagina 17