دانلود رایگان پاورپوینت سیستم جهانی ارتباطات تلفن همراه (انگلیسی)

Global System for Mobile Communications (GSM)
An introduction to GSM
GSM across the world
GSM : The Basic Hierarchy
Salient Features of a GSM System
GSM Services
Call Routing in GSM
Outgoing Call
Incoming Call
Security in GSM
Advantages of GSM over Analog system
Applications of GSM
Future of GSM